BitcodeWriter.cpp revision 912538becad06468283fffcf99196faf067024b6
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 } else if (const NamedMDNode *NMD = dyn_cast<NamedMDNode>(Vals[i].first)) { 529 if (!StartedMetadataBlock) { 530 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 531 StartedMetadataBlock = true; 532 } 533 534 // Write name. 535 std::string Str = NMD->getNameStr(); 536 const char *StrBegin = Str.c_str(); 537 for (unsigned i = 0, e = Str.length(); i != e; ++i) 538 Record.push_back(StrBegin[i]); 539 Stream.EmitRecord(bitc::METADATA_NAME, Record, 0/*TODO*/); 540 Record.clear(); 541 542 // Write named metadata elements. 543 for (unsigned i = 0, e = NMD->getNumElements(); i != e; ++i) { 544 if (NMD->getElement(i)) 545 Record.push_back(VE.getValueID(NMD->getElement(i))); 546 else 547 Record.push_back(0); 548 } 549 Stream.EmitRecord(bitc::METADATA_NAMED_NODE, Record, 0); 550 Record.clear(); 551 } 552 } 553 554 if (StartedMetadataBlock) 555 Stream.ExitBlock(); 556} 557 558static void WriteConstants(unsigned FirstVal, unsigned LastVal, 559 const ValueEnumerator &VE, 560 BitstreamWriter &Stream, bool isGlobal) { 561 if (FirstVal == LastVal) return; 562 563 Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4); 564 565 unsigned AggregateAbbrev = 0; 566 unsigned String8Abbrev = 0; 567 unsigned CString7Abbrev = 0; 568 unsigned CString6Abbrev = 0; 569 // If this is a constant pool for the module, emit module-specific abbrevs. 570 if (isGlobal) { 571 // Abbrev for CST_CODE_AGGREGATE. 572 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 573 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE)); 574 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 575 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1))); 576 AggregateAbbrev = Stream.EmitAbbrev(Abbv); 577 578 // Abbrev for CST_CODE_STRING. 579 Abbv = new BitCodeAbbrev(); 580 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING)); 581 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 582 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 583 String8Abbrev = Stream.EmitAbbrev(Abbv); 584 // Abbrev for CST_CODE_CSTRING. 585 Abbv = new BitCodeAbbrev(); 586 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING)); 587 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 588 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 589 CString7Abbrev = Stream.EmitAbbrev(Abbv); 590 // Abbrev for CST_CODE_CSTRING. 591 Abbv = new BitCodeAbbrev(); 592 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING)); 593 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 594 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 595 CString6Abbrev = Stream.EmitAbbrev(Abbv); 596 } 597 598 SmallVector<uint64_t, 64> Record; 599 600 const ValueEnumerator::ValueList &Vals = VE.getValues(); 601 const Type *LastTy = 0; 602 for (unsigned i = FirstVal; i != LastVal; ++i) { 603 const Value *V = Vals[i].first; 604 if (isa<MetadataBase>(V)) 605 continue; 606 // If we need to switch types, do so now. 607 if (V->getType() != LastTy) { 608 LastTy = V->getType(); 609 Record.push_back(VE.getTypeID(LastTy)); 610 Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record, 611 CONSTANTS_SETTYPE_ABBREV); 612 Record.clear(); 613 } 614 615 if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) { 616 Record.push_back(unsigned(IA->hasSideEffects())); 617 618 // Add the asm string. 619 const std::string &AsmStr = IA->getAsmString(); 620 Record.push_back(AsmStr.size()); 621 for (unsigned i = 0, e = AsmStr.size(); i != e; ++i) 622 Record.push_back(AsmStr[i]); 623 624 // Add the constraint string. 625 const std::string &ConstraintStr = IA->getConstraintString(); 626 Record.push_back(ConstraintStr.size()); 627 for (unsigned i = 0, e = ConstraintStr.size(); i != e; ++i) 628 Record.push_back(ConstraintStr[i]); 629 Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record); 630 Record.clear(); 631 continue; 632 } 633 const Constant *C = cast<Constant>(V); 634 unsigned Code = -1U; 635 unsigned AbbrevToUse = 0; 636 if (C->isNullValue()) { 637 Code = bitc::CST_CODE_NULL; 638 } else if (isa<UndefValue>(C)) { 639 Code = bitc::CST_CODE_UNDEF; 640 } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) { 641 if (IV->getBitWidth() <= 64) { 642 int64_t V = IV->getSExtValue(); 643 if (V >= 0) 644 Record.push_back(V << 1); 645 else 646 Record.push_back((-V << 1) | 1); 647 Code = bitc::CST_CODE_INTEGER; 648 AbbrevToUse = CONSTANTS_INTEGER_ABBREV; 649 } else { // Wide integers, > 64 bits in size. 650 // We have an arbitrary precision integer value to write whose 651 // bit width is > 64. However, in canonical unsigned integer 652 // format it is likely that the high bits are going to be zero. 653 // So, we only write the number of active words. 654 unsigned NWords = IV->getValue().getActiveWords(); 655 const uint64_t *RawWords = IV->getValue().getRawData(); 656 for (unsigned i = 0; i != NWords; ++i) { 657 int64_t V = RawWords[i]; 658 if (V >= 0) 659 Record.push_back(V << 1); 660 else 661 Record.push_back((-V << 1) | 1); 662 } 663 Code = bitc::CST_CODE_WIDE_INTEGER; 664 } 665 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) { 666 Code = bitc::CST_CODE_FLOAT; 667 const Type *Ty = CFP->getType(); 668 if (Ty == Type::FloatTy || Ty == Type::DoubleTy) { 669 Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue()); 670 } else if (Ty == Type::X86_FP80Ty) { 671 // api needed to prevent premature destruction 672 // bits are not in the same order as a normal i80 APInt, compensate. 673 APInt api = CFP->getValueAPF().bitcastToAPInt(); 674 const uint64_t *p = api.getRawData(); 675 Record.push_back((p[1] << 48) | (p[0] >> 16)); 676 Record.push_back(p[0] & 0xffffLL); 677 } else if (Ty == Type::FP128Ty || Ty == Type::PPC_FP128Ty) { 678 APInt api = CFP->getValueAPF().bitcastToAPInt(); 679 const uint64_t *p = api.getRawData(); 680 Record.push_back(p[0]); 681 Record.push_back(p[1]); 682 } else { 683 assert (0 && "Unknown FP type!"); 684 } 685 } else if (isa<ConstantArray>(C) && cast<ConstantArray>(C)->isString()) { 686 // Emit constant strings specially. 687 unsigned NumOps = C->getNumOperands(); 688 // If this is a null-terminated string, use the denser CSTRING encoding. 689 if (C->getOperand(NumOps-1)->isNullValue()) { 690 Code = bitc::CST_CODE_CSTRING; 691 --NumOps; // Don't encode the null, which isn't allowed by char6. 692 } else { 693 Code = bitc::CST_CODE_STRING; 694 AbbrevToUse = String8Abbrev; 695 } 696 bool isCStr7 = Code == bitc::CST_CODE_CSTRING; 697 bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING; 698 for (unsigned i = 0; i != NumOps; ++i) { 699 unsigned char V = cast<ConstantInt>(C->getOperand(i))->getZExtValue(); 700 Record.push_back(V); 701 isCStr7 &= (V & 128) == 0; 702 if (isCStrChar6) 703 isCStrChar6 = BitCodeAbbrevOp::isChar6(V); 704 } 705 706 if (isCStrChar6) 707 AbbrevToUse = CString6Abbrev; 708 else if (isCStr7) 709 AbbrevToUse = CString7Abbrev; 710 } else if (isa<ConstantArray>(C) || isa<ConstantStruct>(V) || 711 isa<ConstantVector>(V)) { 712 Code = bitc::CST_CODE_AGGREGATE; 713 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i) 714 Record.push_back(VE.getValueID(C->getOperand(i))); 715 AbbrevToUse = AggregateAbbrev; 716 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) { 717 switch (CE->getOpcode()) { 718 default: 719 if (Instruction::isCast(CE->getOpcode())) { 720 Code = bitc::CST_CODE_CE_CAST; 721 Record.push_back(GetEncodedCastOpcode(CE->getOpcode())); 722 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 723 Record.push_back(VE.getValueID(C->getOperand(0))); 724 AbbrevToUse = CONSTANTS_CE_CAST_Abbrev; 725 } else { 726 assert(CE->getNumOperands() == 2 && "Unknown constant expr!"); 727 Code = bitc::CST_CODE_CE_BINOP; 728 Record.push_back(GetEncodedBinaryOpcode(CE->getOpcode())); 729 Record.push_back(VE.getValueID(C->getOperand(0))); 730 Record.push_back(VE.getValueID(C->getOperand(1))); 731 uint64_t Flags = GetOptimizationFlags(CE); 732 if (Flags != 0) 733 Record.push_back(Flags); 734 } 735 break; 736 case Instruction::GetElementPtr: 737 Code = bitc::CST_CODE_CE_GEP; 738 if (cast<GEPOperator>(C)->isInBounds()) 739 Code = bitc::CST_CODE_CE_INBOUNDS_GEP; 740 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) { 741 Record.push_back(VE.getTypeID(C->getOperand(i)->getType())); 742 Record.push_back(VE.getValueID(C->getOperand(i))); 743 } 744 break; 745 case Instruction::Select: 746 Code = bitc::CST_CODE_CE_SELECT; 747 Record.push_back(VE.getValueID(C->getOperand(0))); 748 Record.push_back(VE.getValueID(C->getOperand(1))); 749 Record.push_back(VE.getValueID(C->getOperand(2))); 750 break; 751 case Instruction::ExtractElement: 752 Code = bitc::CST_CODE_CE_EXTRACTELT; 753 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 754 Record.push_back(VE.getValueID(C->getOperand(0))); 755 Record.push_back(VE.getValueID(C->getOperand(1))); 756 break; 757 case Instruction::InsertElement: 758 Code = bitc::CST_CODE_CE_INSERTELT; 759 Record.push_back(VE.getValueID(C->getOperand(0))); 760 Record.push_back(VE.getValueID(C->getOperand(1))); 761 Record.push_back(VE.getValueID(C->getOperand(2))); 762 break; 763 case Instruction::ShuffleVector: 764 // If the return type and argument types are the same, this is a 765 // standard shufflevector instruction. If the types are different, 766 // then the shuffle is widening or truncating the input vectors, and 767 // the argument type must also be encoded. 768 if (C->getType() == C->getOperand(0)->getType()) { 769 Code = bitc::CST_CODE_CE_SHUFFLEVEC; 770 } else { 771 Code = bitc::CST_CODE_CE_SHUFVEC_EX; 772 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 773 } 774 Record.push_back(VE.getValueID(C->getOperand(0))); 775 Record.push_back(VE.getValueID(C->getOperand(1))); 776 Record.push_back(VE.getValueID(C->getOperand(2))); 777 break; 778 case Instruction::ICmp: 779 case Instruction::FCmp: 780 Code = bitc::CST_CODE_CE_CMP; 781 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 782 Record.push_back(VE.getValueID(C->getOperand(0))); 783 Record.push_back(VE.getValueID(C->getOperand(1))); 784 Record.push_back(CE->getPredicate()); 785 break; 786 } 787 } else { 788 llvm_unreachable("Unknown constant!"); 789 } 790 Stream.EmitRecord(Code, Record, AbbrevToUse); 791 Record.clear(); 792 } 793 794 Stream.ExitBlock(); 795} 796 797static void WriteModuleConstants(const ValueEnumerator &VE, 798 BitstreamWriter &Stream) { 799 const ValueEnumerator::ValueList &Vals = VE.getValues(); 800 801 // Find the first constant to emit, which is the first non-globalvalue value. 802 // We know globalvalues have been emitted by WriteModuleInfo. 803 for (unsigned i = 0, e = Vals.size(); i != e; ++i) { 804 if (!isa<GlobalValue>(Vals[i].first)) { 805 WriteConstants(i, Vals.size(), VE, Stream, true); 806 return; 807 } 808 } 809} 810 811/// PushValueAndType - The file has to encode both the value and type id for 812/// many values, because we need to know what type to create for forward 813/// references. However, most operands are not forward references, so this type 814/// field is not needed. 815/// 816/// This function adds V's value ID to Vals. If the value ID is higher than the 817/// instruction ID, then it is a forward reference, and it also includes the 818/// type ID. 819static bool PushValueAndType(const Value *V, unsigned InstID, 820 SmallVector<unsigned, 64> &Vals, 821 ValueEnumerator &VE) { 822 unsigned ValID = VE.getValueID(V); 823 Vals.push_back(ValID); 824 if (ValID >= InstID) { 825 Vals.push_back(VE.getTypeID(V->getType())); 826 return true; 827 } 828 return false; 829} 830 831/// WriteInstruction - Emit an instruction to the specified stream. 832static void WriteInstruction(const Instruction &I, unsigned InstID, 833 ValueEnumerator &VE, BitstreamWriter &Stream, 834 SmallVector<unsigned, 64> &Vals) { 835 unsigned Code = 0; 836 unsigned AbbrevToUse = 0; 837 switch (I.getOpcode()) { 838 default: 839 if (Instruction::isCast(I.getOpcode())) { 840 Code = bitc::FUNC_CODE_INST_CAST; 841 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 842 AbbrevToUse = FUNCTION_INST_CAST_ABBREV; 843 Vals.push_back(VE.getTypeID(I.getType())); 844 Vals.push_back(GetEncodedCastOpcode(I.getOpcode())); 845 } else { 846 assert(isa<BinaryOperator>(I) && "Unknown instruction!"); 847 Code = bitc::FUNC_CODE_INST_BINOP; 848 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 849 AbbrevToUse = FUNCTION_INST_BINOP_ABBREV; 850 Vals.push_back(VE.getValueID(I.getOperand(1))); 851 Vals.push_back(GetEncodedBinaryOpcode(I.getOpcode())); 852 uint64_t Flags = GetOptimizationFlags(&I); 853 if (Flags != 0) { 854 if (AbbrevToUse == FUNCTION_INST_BINOP_ABBREV) 855 AbbrevToUse = FUNCTION_INST_BINOP_FLAGS_ABBREV; 856 Vals.push_back(Flags); 857 } 858 } 859 break; 860 861 case Instruction::GetElementPtr: 862 Code = bitc::FUNC_CODE_INST_GEP; 863 if (cast<GEPOperator>(&I)->isInBounds()) 864 Code = bitc::FUNC_CODE_INST_INBOUNDS_GEP; 865 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 866 PushValueAndType(I.getOperand(i), InstID, Vals, VE); 867 break; 868 case Instruction::ExtractValue: { 869 Code = bitc::FUNC_CODE_INST_EXTRACTVAL; 870 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 871 const ExtractValueInst *EVI = cast<ExtractValueInst>(&I); 872 for (const unsigned *i = EVI->idx_begin(), *e = EVI->idx_end(); i != e; ++i) 873 Vals.push_back(*i); 874 break; 875 } 876 case Instruction::InsertValue: { 877 Code = bitc::FUNC_CODE_INST_INSERTVAL; 878 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 879 PushValueAndType(I.getOperand(1), InstID, Vals, VE); 880 const InsertValueInst *IVI = cast<InsertValueInst>(&I); 881 for (const unsigned *i = IVI->idx_begin(), *e = IVI->idx_end(); i != e; ++i) 882 Vals.push_back(*i); 883 break; 884 } 885 case Instruction::Select: 886 Code = bitc::FUNC_CODE_INST_VSELECT; 887 PushValueAndType(I.getOperand(1), InstID, Vals, VE); 888 Vals.push_back(VE.getValueID(I.getOperand(2))); 889 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 890 break; 891 case Instruction::ExtractElement: 892 Code = bitc::FUNC_CODE_INST_EXTRACTELT; 893 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 894 Vals.push_back(VE.getValueID(I.getOperand(1))); 895 break; 896 case Instruction::InsertElement: 897 Code = bitc::FUNC_CODE_INST_INSERTELT; 898 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 899 Vals.push_back(VE.getValueID(I.getOperand(1))); 900 Vals.push_back(VE.getValueID(I.getOperand(2))); 901 break; 902 case Instruction::ShuffleVector: 903 Code = bitc::FUNC_CODE_INST_SHUFFLEVEC; 904 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 905 Vals.push_back(VE.getValueID(I.getOperand(1))); 906 Vals.push_back(VE.getValueID(I.getOperand(2))); 907 break; 908 case Instruction::ICmp: 909 case Instruction::FCmp: 910 // compare returning Int1Ty or vector of Int1Ty 911 Code = bitc::FUNC_CODE_INST_CMP2; 912 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 913 Vals.push_back(VE.getValueID(I.getOperand(1))); 914 Vals.push_back(cast<CmpInst>(I).getPredicate()); 915 break; 916 917 case Instruction::Ret: 918 { 919 Code = bitc::FUNC_CODE_INST_RET; 920 unsigned NumOperands = I.getNumOperands(); 921 if (NumOperands == 0) 922 AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV; 923 else if (NumOperands == 1) { 924 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 925 AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV; 926 } else { 927 for (unsigned i = 0, e = NumOperands; i != e; ++i) 928 PushValueAndType(I.getOperand(i), InstID, Vals, VE); 929 } 930 } 931 break; 932 case Instruction::Br: 933 { 934 Code = bitc::FUNC_CODE_INST_BR; 935 BranchInst &II(cast<BranchInst>(I)); 936 Vals.push_back(VE.getValueID(II.getSuccessor(0))); 937 if (II.isConditional()) { 938 Vals.push_back(VE.getValueID(II.getSuccessor(1))); 939 Vals.push_back(VE.getValueID(II.getCondition())); 940 } 941 } 942 break; 943 case Instruction::Switch: 944 Code = bitc::FUNC_CODE_INST_SWITCH; 945 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 946 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 947 Vals.push_back(VE.getValueID(I.getOperand(i))); 948 break; 949 case Instruction::Invoke: { 950 const InvokeInst *II = cast<InvokeInst>(&I); 951 const Value *Callee(II->getCalledValue()); 952 const PointerType *PTy = cast<PointerType>(Callee->getType()); 953 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 954 Code = bitc::FUNC_CODE_INST_INVOKE; 955 956 Vals.push_back(VE.getAttributeID(II->getAttributes())); 957 Vals.push_back(II->getCallingConv()); 958 Vals.push_back(VE.getValueID(II->getNormalDest())); 959 Vals.push_back(VE.getValueID(II->getUnwindDest())); 960 PushValueAndType(Callee, InstID, Vals, VE); 961 962 // Emit value #'s for the fixed parameters. 963 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) 964 Vals.push_back(VE.getValueID(I.getOperand(i+3))); // fixed param. 965 966 // Emit type/value pairs for varargs params. 967 if (FTy->isVarArg()) { 968 for (unsigned i = 3+FTy->getNumParams(), e = I.getNumOperands(); 969 i != e; ++i) 970 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // vararg 971 } 972 break; 973 } 974 case Instruction::Unwind: 975 Code = bitc::FUNC_CODE_INST_UNWIND; 976 break; 977 case Instruction::Unreachable: 978 Code = bitc::FUNC_CODE_INST_UNREACHABLE; 979 AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV; 980 break; 981 982 case Instruction::PHI: 983 Code = bitc::FUNC_CODE_INST_PHI; 984 Vals.push_back(VE.getTypeID(I.getType())); 985 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 986 Vals.push_back(VE.getValueID(I.getOperand(i))); 987 break; 988 989 case Instruction::Malloc: 990 Code = bitc::FUNC_CODE_INST_MALLOC; 991 Vals.push_back(VE.getTypeID(I.getType())); 992 Vals.push_back(VE.getValueID(I.getOperand(0))); // size. 993 Vals.push_back(Log2_32(cast<MallocInst>(I).getAlignment())+1); 994 break; 995 996 case Instruction::Free: 997 Code = bitc::FUNC_CODE_INST_FREE; 998 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 999 break; 1000 1001 case Instruction::Alloca: 1002 Code = bitc::FUNC_CODE_INST_ALLOCA; 1003 Vals.push_back(VE.getTypeID(I.getType())); 1004 Vals.push_back(VE.getValueID(I.getOperand(0))); // size. 1005 Vals.push_back(Log2_32(cast<AllocaInst>(I).getAlignment())+1); 1006 break; 1007 1008 case Instruction::Load: 1009 Code = bitc::FUNC_CODE_INST_LOAD; 1010 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) // ptr 1011 AbbrevToUse = FUNCTION_INST_LOAD_ABBREV; 1012 1013 Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1); 1014 Vals.push_back(cast<LoadInst>(I).isVolatile()); 1015 break; 1016 case Instruction::Store: 1017 Code = bitc::FUNC_CODE_INST_STORE2; 1018 PushValueAndType(I.getOperand(1), InstID, Vals, VE); // ptrty + ptr 1019 Vals.push_back(VE.getValueID(I.getOperand(0))); // val. 1020 Vals.push_back(Log2_32(cast<StoreInst>(I).getAlignment())+1); 1021 Vals.push_back(cast<StoreInst>(I).isVolatile()); 1022 break; 1023 case Instruction::Call: { 1024 const PointerType *PTy = cast<PointerType>(I.getOperand(0)->getType()); 1025 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 1026 1027 Code = bitc::FUNC_CODE_INST_CALL; 1028 1029 const CallInst *CI = cast<CallInst>(&I); 1030 Vals.push_back(VE.getAttributeID(CI->getAttributes())); 1031 Vals.push_back((CI->getCallingConv() << 1) | unsigned(CI->isTailCall())); 1032 PushValueAndType(CI->getOperand(0), InstID, Vals, VE); // Callee 1033 1034 // Emit value #'s for the fixed parameters. 1035 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) 1036 Vals.push_back(VE.getValueID(I.getOperand(i+1))); // fixed param. 1037 1038 // Emit type/value pairs for varargs params. 1039 if (FTy->isVarArg()) { 1040 unsigned NumVarargs = I.getNumOperands()-1-FTy->getNumParams(); 1041 for (unsigned i = I.getNumOperands()-NumVarargs, e = I.getNumOperands(); 1042 i != e; ++i) 1043 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // varargs 1044 } 1045 break; 1046 } 1047 case Instruction::VAArg: 1048 Code = bitc::FUNC_CODE_INST_VAARG; 1049 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); // valistty 1050 Vals.push_back(VE.getValueID(I.getOperand(0))); // valist. 1051 Vals.push_back(VE.getTypeID(I.getType())); // restype. 1052 break; 1053 } 1054 1055 Stream.EmitRecord(Code, Vals, AbbrevToUse); 1056 Vals.clear(); 1057} 1058 1059// Emit names for globals/functions etc. 1060static void WriteValueSymbolTable(const ValueSymbolTable &VST, 1061 const ValueEnumerator &VE, 1062 BitstreamWriter &Stream) { 1063 if (VST.empty()) return; 1064 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4); 1065 1066 // FIXME: Set up the abbrev, we know how many values there are! 1067 // FIXME: We know if the type names can use 7-bit ascii. 1068 SmallVector<unsigned, 64> NameVals; 1069 1070 for (ValueSymbolTable::const_iterator SI = VST.begin(), SE = VST.end(); 1071 SI != SE; ++SI) { 1072 1073 const ValueName &Name = *SI; 1074 1075 // Figure out the encoding to use for the name. 1076 bool is7Bit = true; 1077 bool isChar6 = true; 1078 for (const char *C = Name.getKeyData(), *E = C+Name.getKeyLength(); 1079 C != E; ++C) { 1080 if (isChar6) 1081 isChar6 = BitCodeAbbrevOp::isChar6(*C); 1082 if ((unsigned char)*C & 128) { 1083 is7Bit = false; 1084 break; // don't bother scanning the rest. 1085 } 1086 } 1087 1088 unsigned AbbrevToUse = VST_ENTRY_8_ABBREV; 1089 1090 // VST_ENTRY: [valueid, namechar x N] 1091 // VST_BBENTRY: [bbid, namechar x N] 1092 unsigned Code; 1093 if (isa<BasicBlock>(*SI->getValue())) { 1094 Code = bitc::VST_CODE_BBENTRY; 1095 if (isChar6) 1096 AbbrevToUse = VST_BBENTRY_6_ABBREV; 1097 } else { 1098 Code = bitc::VST_CODE_ENTRY; 1099 if (isChar6) 1100 AbbrevToUse = VST_ENTRY_6_ABBREV; 1101 else if (is7Bit) 1102 AbbrevToUse = VST_ENTRY_7_ABBREV; 1103 } 1104 1105 NameVals.push_back(VE.getValueID(SI->getValue())); 1106 for (const char *P = Name.getKeyData(), 1107 *E = Name.getKeyData()+Name.getKeyLength(); P != E; ++P) 1108 NameVals.push_back((unsigned char)*P); 1109 1110 // Emit the finished record. 1111 Stream.EmitRecord(Code, NameVals, AbbrevToUse); 1112 NameVals.clear(); 1113 } 1114 Stream.ExitBlock(); 1115} 1116 1117/// WriteFunction - Emit a function body to the module stream. 1118static void WriteFunction(const Function &F, ValueEnumerator &VE, 1119 BitstreamWriter &Stream) { 1120 Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4); 1121 VE.incorporateFunction(F); 1122 1123 SmallVector<unsigned, 64> Vals; 1124 1125 // Emit the number of basic blocks, so the reader can create them ahead of 1126 // time. 1127 Vals.push_back(VE.getBasicBlocks().size()); 1128 Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals); 1129 Vals.clear(); 1130 1131 // If there are function-local constants, emit them now. 1132 unsigned CstStart, CstEnd; 1133 VE.getFunctionConstantRange(CstStart, CstEnd); 1134 WriteConstants(CstStart, CstEnd, VE, Stream, false); 1135 1136 // Keep a running idea of what the instruction ID is. 1137 unsigned InstID = CstEnd; 1138 1139 // Finally, emit all the instructions, in order. 1140 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) 1141 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); 1142 I != E; ++I) { 1143 WriteInstruction(*I, InstID, VE, Stream, Vals); 1144 if (I->getType() != Type::VoidTy) 1145 ++InstID; 1146 } 1147 1148 // Emit names for all the instructions etc. 1149 WriteValueSymbolTable(F.getValueSymbolTable(), VE, Stream); 1150 1151 VE.purgeFunction(); 1152 Stream.ExitBlock(); 1153} 1154 1155/// WriteTypeSymbolTable - Emit a block for the specified type symtab. 1156static void WriteTypeSymbolTable(const TypeSymbolTable &TST, 1157 const ValueEnumerator &VE, 1158 BitstreamWriter &Stream) { 1159 if (TST.empty()) return; 1160 1161 Stream.EnterSubblock(bitc::TYPE_SYMTAB_BLOCK_ID, 3); 1162 1163 // 7-bit fixed width VST_CODE_ENTRY strings. 1164 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1165 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 1166 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1167 Log2_32_Ceil(VE.getTypes().size()+1))); 1168 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1169 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 1170 unsigned V7Abbrev = Stream.EmitAbbrev(Abbv); 1171 1172 SmallVector<unsigned, 64> NameVals; 1173 1174 for (TypeSymbolTable::const_iterator TI = TST.begin(), TE = TST.end(); 1175 TI != TE; ++TI) { 1176 // TST_ENTRY: [typeid, namechar x N] 1177 NameVals.push_back(VE.getTypeID(TI->second)); 1178 1179 const std::string &Str = TI->first; 1180 bool is7Bit = true; 1181 for (unsigned i = 0, e = Str.size(); i != e; ++i) { 1182 NameVals.push_back((unsigned char)Str[i]); 1183 if (Str[i] & 128) 1184 is7Bit = false; 1185 } 1186 1187 // Emit the finished record. 1188 Stream.EmitRecord(bitc::VST_CODE_ENTRY, NameVals, is7Bit ? V7Abbrev : 0); 1189 NameVals.clear(); 1190 } 1191 1192 Stream.ExitBlock(); 1193} 1194 1195// Emit blockinfo, which defines the standard abbreviations etc. 1196static void WriteBlockInfo(const ValueEnumerator &VE, BitstreamWriter &Stream) { 1197 // We only want to emit block info records for blocks that have multiple 1198 // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK. Other 1199 // blocks can defined their abbrevs inline. 1200 Stream.EnterBlockInfoBlock(2); 1201 1202 { // 8-bit fixed-width VST_ENTRY/VST_BBENTRY strings. 1203 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1204 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); 1205 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1206 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1207 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 1208 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1209 Abbv) != VST_ENTRY_8_ABBREV) 1210 llvm_unreachable("Unexpected abbrev ordering!"); 1211 } 1212 1213 { // 7-bit fixed width VST_ENTRY strings. 1214 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1215 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 1216 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1217 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1218 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 1219 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1220 Abbv) != VST_ENTRY_7_ABBREV) 1221 llvm_unreachable("Unexpected abbrev ordering!"); 1222 } 1223 { // 6-bit char6 VST_ENTRY strings. 1224 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1225 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 1226 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1227 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1228 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 1229 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1230 Abbv) != VST_ENTRY_6_ABBREV) 1231 llvm_unreachable("Unexpected abbrev ordering!"); 1232 } 1233 { // 6-bit char6 VST_BBENTRY strings. 1234 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1235 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY)); 1236 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1237 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1238 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 1239 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1240 Abbv) != VST_BBENTRY_6_ABBREV) 1241 llvm_unreachable("Unexpected abbrev ordering!"); 1242 } 1243 1244 1245 1246 { // SETTYPE abbrev for CONSTANTS_BLOCK. 1247 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1248 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE)); 1249 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1250 Log2_32_Ceil(VE.getTypes().size()+1))); 1251 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1252 Abbv) != CONSTANTS_SETTYPE_ABBREV) 1253 llvm_unreachable("Unexpected abbrev ordering!"); 1254 } 1255 1256 { // INTEGER abbrev for CONSTANTS_BLOCK. 1257 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1258 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER)); 1259 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1260 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1261 Abbv) != CONSTANTS_INTEGER_ABBREV) 1262 llvm_unreachable("Unexpected abbrev ordering!"); 1263 } 1264 1265 { // CE_CAST abbrev for CONSTANTS_BLOCK. 1266 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1267 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST)); 1268 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // cast opc 1269 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid 1270 Log2_32_Ceil(VE.getTypes().size()+1))); 1271 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id 1272 1273 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1274 Abbv) != CONSTANTS_CE_CAST_Abbrev) 1275 llvm_unreachable("Unexpected abbrev ordering!"); 1276 } 1277 { // NULL abbrev for CONSTANTS_BLOCK. 1278 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1279 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL)); 1280 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1281 Abbv) != CONSTANTS_NULL_Abbrev) 1282 llvm_unreachable("Unexpected abbrev ordering!"); 1283 } 1284 1285 // FIXME: This should only use space for first class types! 1286 1287 { // INST_LOAD abbrev for FUNCTION_BLOCK. 1288 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1289 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD)); 1290 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr 1291 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align 1292 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile 1293 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1294 Abbv) != FUNCTION_INST_LOAD_ABBREV) 1295 llvm_unreachable("Unexpected abbrev ordering!"); 1296 } 1297 { // INST_BINOP abbrev for FUNCTION_BLOCK. 1298 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1299 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP)); 1300 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS 1301 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS 1302 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1303 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1304 Abbv) != FUNCTION_INST_BINOP_ABBREV) 1305 llvm_unreachable("Unexpected abbrev ordering!"); 1306 } 1307 { // INST_BINOP_FLAGS abbrev for FUNCTION_BLOCK. 1308 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1309 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP)); 1310 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS 1311 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS 1312 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1313 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); // flags 1314 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1315 Abbv) != FUNCTION_INST_BINOP_FLAGS_ABBREV) 1316 llvm_unreachable("Unexpected abbrev ordering!"); 1317 } 1318 { // INST_CAST abbrev for FUNCTION_BLOCK. 1319 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1320 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST)); 1321 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // OpVal 1322 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty 1323 Log2_32_Ceil(VE.getTypes().size()+1))); 1324 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1325 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1326 Abbv) != FUNCTION_INST_CAST_ABBREV) 1327 llvm_unreachable("Unexpected abbrev ordering!"); 1328 } 1329 1330 { // INST_RET abbrev for FUNCTION_BLOCK. 1331 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1332 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET)); 1333 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1334 Abbv) != FUNCTION_INST_RET_VOID_ABBREV) 1335 llvm_unreachable("Unexpected abbrev ordering!"); 1336 } 1337 { // INST_RET abbrev for FUNCTION_BLOCK. 1338 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1339 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET)); 1340 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID 1341 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1342 Abbv) != FUNCTION_INST_RET_VAL_ABBREV) 1343 llvm_unreachable("Unexpected abbrev ordering!"); 1344 } 1345 { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK. 1346 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1347 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE)); 1348 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1349 Abbv) != FUNCTION_INST_UNREACHABLE_ABBREV) 1350 llvm_unreachable("Unexpected abbrev ordering!"); 1351 } 1352 1353 Stream.ExitBlock(); 1354} 1355 1356 1357/// WriteModule - Emit the specified module to the bitstream. 1358static void WriteModule(const Module *M, BitstreamWriter &Stream) { 1359 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3); 1360 1361 // Emit the version number if it is non-zero. 1362 if (CurVersion) { 1363 SmallVector<unsigned, 1> Vals; 1364 Vals.push_back(CurVersion); 1365 Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals); 1366 } 1367 1368 // Analyze the module, enumerating globals, functions, etc. 1369 ValueEnumerator VE(M); 1370 1371 // Emit blockinfo, which defines the standard abbreviations etc. 1372 WriteBlockInfo(VE, Stream); 1373 1374 // Emit information about parameter attributes. 1375 WriteAttributeTable(VE, Stream); 1376 1377 // Emit information describing all of the types in the module. 1378 WriteTypeTable(VE, Stream); 1379 1380 // Emit top-level description of module, including target triple, inline asm, 1381 // descriptors for global variables, and function prototype info. 1382 WriteModuleInfo(M, VE, Stream); 1383 1384 // Emit constants. 1385 WriteModuleConstants(VE, Stream); 1386 1387 // Emit metadata. 1388 WriteModuleMetadata(VE, Stream); 1389 1390 // Emit function bodies. 1391 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) 1392 if (!I->isDeclaration()) 1393 WriteFunction(*I, VE, Stream); 1394 1395 // Emit the type symbol table information. 1396 WriteTypeSymbolTable(M->getTypeSymbolTable(), VE, Stream); 1397 1398 // Emit names for globals/functions etc. 1399 WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream); 1400 1401 Stream.ExitBlock(); 1402} 1403 1404/// EmitDarwinBCHeader - If generating a bc file on darwin, we have to emit a 1405/// header and trailer to make it compatible with the system archiver. To do 1406/// this we emit the following header, and then emit a trailer that pads the 1407/// file out to be a multiple of 16 bytes. 1408/// 1409/// struct bc_header { 1410/// uint32_t Magic; // 0x0B17C0DE 1411/// uint32_t Version; // Version, currently always 0. 1412/// uint32_t BitcodeOffset; // Offset to traditional bitcode file. 1413/// uint32_t BitcodeSize; // Size of traditional bitcode file. 1414/// uint32_t CPUType; // CPU specifier. 1415/// ... potentially more later ... 1416/// }; 1417enum { 1418 DarwinBCSizeFieldOffset = 3*4, // Offset to bitcode_size. 1419 DarwinBCHeaderSize = 5*4 1420}; 1421 1422static void EmitDarwinBCHeader(BitstreamWriter &Stream, 1423 const std::string &TT) { 1424 unsigned CPUType = ~0U; 1425 1426 // Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*. The CPUType is a 1427 // magic number from /usr/include/mach/machine.h. It is ok to reproduce the 1428 // specific constants here because they are implicitly part of the Darwin ABI. 1429 enum { 1430 DARWIN_CPU_ARCH_ABI64 = 0x01000000, 1431 DARWIN_CPU_TYPE_X86 = 7, 1432 DARWIN_CPU_TYPE_POWERPC = 18 1433 }; 1434 1435 if (TT.find("x86_64-") == 0) 1436 CPUType = DARWIN_CPU_TYPE_X86 | DARWIN_CPU_ARCH_ABI64; 1437 else if (TT.size() >= 5 && TT[0] == 'i' && TT[2] == '8' && TT[3] == '6' && 1438 TT[4] == '-' && TT[1] - '3' < 6) 1439 CPUType = DARWIN_CPU_TYPE_X86; 1440 else if (TT.find("powerpc-") == 0) 1441 CPUType = DARWIN_CPU_TYPE_POWERPC; 1442 else if (TT.find("powerpc64-") == 0) 1443 CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64; 1444 1445 // Traditional Bitcode starts after header. 1446 unsigned BCOffset = DarwinBCHeaderSize; 1447 1448 Stream.Emit(0x0B17C0DE, 32); 1449 Stream.Emit(0 , 32); // Version. 1450 Stream.Emit(BCOffset , 32); 1451 Stream.Emit(0 , 32); // Filled in later. 1452 Stream.Emit(CPUType , 32); 1453} 1454 1455/// EmitDarwinBCTrailer - Emit the darwin epilog after the bitcode file and 1456/// finalize the header. 1457static void EmitDarwinBCTrailer(BitstreamWriter &Stream, unsigned BufferSize) { 1458 // Update the size field in the header. 1459 Stream.BackpatchWord(DarwinBCSizeFieldOffset, BufferSize-DarwinBCHeaderSize); 1460 1461 // If the file is not a multiple of 16 bytes, insert dummy padding. 1462 while (BufferSize & 15) { 1463 Stream.Emit(0, 8); 1464 ++BufferSize; 1465 } 1466} 1467 1468 1469/// WriteBitcodeToFile - Write the specified module to the specified output 1470/// stream. 1471void llvm::WriteBitcodeToFile(const Module *M, std::ostream &Out) { 1472 raw_os_ostream RawOut(Out); 1473 // If writing to stdout, set binary mode. 1474 if (llvm::cout == Out) 1475 sys::Program::ChangeStdoutToBinary(); 1476 WriteBitcodeToFile(M, RawOut); 1477} 1478 1479/// WriteBitcodeToFile - Write the specified module to the specified output 1480/// stream. 1481void llvm::WriteBitcodeToFile(const Module *M, raw_ostream &Out) { 1482 std::vector<unsigned char> Buffer; 1483 BitstreamWriter Stream(Buffer); 1484 1485 Buffer.reserve(256*1024); 1486 1487 WriteBitcodeToStream( M, Stream ); 1488 1489 // If writing to stdout, set binary mode. 1490 if (&llvm::outs() == &Out) 1491 sys::Program::ChangeStdoutToBinary(); 1492 1493 // Write the generated bitstream to "Out". 1494 Out.write((char*)&Buffer.front(), Buffer.size()); 1495 1496 // Make sure it hits disk now. 1497 Out.flush(); 1498} 1499 1500/// WriteBitcodeToStream - Write the specified module to the specified output 1501/// stream. 1502void llvm::WriteBitcodeToStream(const Module *M, BitstreamWriter &Stream) { 1503 // If this is darwin, emit a file header and trailer if needed. 1504 bool isDarwin = M->getTargetTriple().find("-darwin") != std::string::npos; 1505 if (isDarwin) 1506 EmitDarwinBCHeader(Stream, M->getTargetTriple()); 1507 1508 // Emit the file header. 1509 Stream.Emit((unsigned)'B', 8); 1510 Stream.Emit((unsigned)'C', 8); 1511 Stream.Emit(0x0, 4); 1512 Stream.Emit(0xC, 4); 1513 Stream.Emit(0xE, 4); 1514 Stream.Emit(0xD, 4); 1515 1516 // Emit the module. 1517 WriteModule(M, Stream); 1518 1519 if (isDarwin) 1520 EmitDarwinBCTrailer(Stream, Stream.getBuffer().size()); 1521} 1522