BitcodeWriter.cpp revision b85c7100c5f1ef34bace56c6978eca429df798f6
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/Module.h" 23#include "llvm/Operator.h" 24#include "llvm/TypeSymbolTable.h" 25#include "llvm/ValueSymbolTable.h" 26#include "llvm/Support/ErrorHandling.h" 27#include "llvm/Support/MathExtras.h" 28#include "llvm/Support/raw_ostream.h" 29#include "llvm/System/Program.h" 30using namespace llvm; 31 32/// These are manifest constants used by the bitcode writer. They do not need to 33/// be kept in sync with the reader, but need to be consistent within this file. 34enum { 35 CurVersion = 0, 36 37 // VALUE_SYMTAB_BLOCK abbrev id's. 38 VST_ENTRY_8_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 39 VST_ENTRY_7_ABBREV, 40 VST_ENTRY_6_ABBREV, 41 VST_BBENTRY_6_ABBREV, 42 43 // CONSTANTS_BLOCK abbrev id's. 44 CONSTANTS_SETTYPE_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 45 CONSTANTS_INTEGER_ABBREV, 46 CONSTANTS_CE_CAST_Abbrev, 47 CONSTANTS_NULL_Abbrev, 48 49 // FUNCTION_BLOCK abbrev id's. 50 FUNCTION_INST_LOAD_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 51 FUNCTION_INST_BINOP_ABBREV, 52 FUNCTION_INST_BINOP_FLAGS_ABBREV, 53 FUNCTION_INST_CAST_ABBREV, 54 FUNCTION_INST_RET_VOID_ABBREV, 55 FUNCTION_INST_RET_VAL_ABBREV, 56 FUNCTION_INST_UNREACHABLE_ABBREV 57}; 58 59 60static unsigned GetEncodedCastOpcode(unsigned Opcode) { 61 switch (Opcode) { 62 default: llvm_unreachable("Unknown cast instruction!"); 63 case Instruction::Trunc : return bitc::CAST_TRUNC; 64 case Instruction::ZExt : return bitc::CAST_ZEXT; 65 case Instruction::SExt : return bitc::CAST_SEXT; 66 case Instruction::FPToUI : return bitc::CAST_FPTOUI; 67 case Instruction::FPToSI : return bitc::CAST_FPTOSI; 68 case Instruction::UIToFP : return bitc::CAST_UITOFP; 69 case Instruction::SIToFP : return bitc::CAST_SITOFP; 70 case Instruction::FPTrunc : return bitc::CAST_FPTRUNC; 71 case Instruction::FPExt : return bitc::CAST_FPEXT; 72 case Instruction::PtrToInt: return bitc::CAST_PTRTOINT; 73 case Instruction::IntToPtr: return bitc::CAST_INTTOPTR; 74 case Instruction::BitCast : return bitc::CAST_BITCAST; 75 } 76} 77 78static unsigned GetEncodedBinaryOpcode(unsigned Opcode) { 79 switch (Opcode) { 80 default: llvm_unreachable("Unknown binary instruction!"); 81 case Instruction::Add: 82 case Instruction::FAdd: return bitc::BINOP_ADD; 83 case Instruction::Sub: 84 case Instruction::FSub: return bitc::BINOP_SUB; 85 case Instruction::Mul: 86 case Instruction::FMul: return bitc::BINOP_MUL; 87 case Instruction::UDiv: return bitc::BINOP_UDIV; 88 case Instruction::FDiv: 89 case Instruction::SDiv: return bitc::BINOP_SDIV; 90 case Instruction::URem: return bitc::BINOP_UREM; 91 case Instruction::FRem: 92 case Instruction::SRem: return bitc::BINOP_SREM; 93 case Instruction::Shl: return bitc::BINOP_SHL; 94 case Instruction::LShr: return bitc::BINOP_LSHR; 95 case Instruction::AShr: return bitc::BINOP_ASHR; 96 case Instruction::And: return bitc::BINOP_AND; 97 case Instruction::Or: return bitc::BINOP_OR; 98 case Instruction::Xor: return bitc::BINOP_XOR; 99 } 100} 101 102 103 104static void WriteStringRecord(unsigned Code, const std::string &Str, 105 unsigned AbbrevToUse, BitstreamWriter &Stream) { 106 SmallVector<unsigned, 64> Vals; 107 108 // Code: [strchar x N] 109 for (unsigned i = 0, e = Str.size(); i != e; ++i) 110 Vals.push_back(Str[i]); 111 112 // Emit the finished record. 113 Stream.EmitRecord(Code, Vals, AbbrevToUse); 114} 115 116// Emit information about parameter attributes. 117static void WriteAttributeTable(const ValueEnumerator &VE, 118 BitstreamWriter &Stream) { 119 const std::vector<AttrListPtr> &Attrs = VE.getAttributes(); 120 if (Attrs.empty()) return; 121 122 Stream.EnterSubblock(bitc::PARAMATTR_BLOCK_ID, 3); 123 124 SmallVector<uint64_t, 64> Record; 125 for (unsigned i = 0, e = Attrs.size(); i != e; ++i) { 126 const AttrListPtr &A = Attrs[i]; 127 for (unsigned i = 0, e = A.getNumSlots(); i != e; ++i) { 128 const AttributeWithIndex &PAWI = A.getSlot(i); 129 Record.push_back(PAWI.Index); 130 131 // FIXME: remove in LLVM 3.0 132 // Store the alignment in the bitcode as a 16-bit raw value instead of a 133 // 5-bit log2 encoded value. Shift the bits above the alignment up by 134 // 11 bits. 135 uint64_t FauxAttr = PAWI.Attrs & 0xffff; 136 if (PAWI.Attrs & Attribute::Alignment) 137 FauxAttr |= (1ull<<16)<<(((PAWI.Attrs & Attribute::Alignment)-1) >> 16); 138 FauxAttr |= (PAWI.Attrs & (0x3FFull << 21)) << 11; 139 140 Record.push_back(FauxAttr); 141 } 142 143 Stream.EmitRecord(bitc::PARAMATTR_CODE_ENTRY, Record); 144 Record.clear(); 145 } 146 147 Stream.ExitBlock(); 148} 149 150/// WriteTypeTable - Write out the type table for a module. 151static void WriteTypeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) { 152 const ValueEnumerator::TypeList &TypeList = VE.getTypes(); 153 154 Stream.EnterSubblock(bitc::TYPE_BLOCK_ID, 4 /*count from # abbrevs */); 155 SmallVector<uint64_t, 64> TypeVals; 156 157 // Abbrev for TYPE_CODE_POINTER. 158 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 159 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_POINTER)); 160 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 161 Log2_32_Ceil(VE.getTypes().size()+1))); 162 Abbv->Add(BitCodeAbbrevOp(0)); // Addrspace = 0 163 unsigned PtrAbbrev = Stream.EmitAbbrev(Abbv); 164 165 // Abbrev for TYPE_CODE_FUNCTION. 166 Abbv = new BitCodeAbbrev(); 167 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_FUNCTION)); 168 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isvararg 169 Abbv->Add(BitCodeAbbrevOp(0)); // FIXME: DEAD value, remove in LLVM 3.0 170 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 171 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 172 Log2_32_Ceil(VE.getTypes().size()+1))); 173 unsigned FunctionAbbrev = Stream.EmitAbbrev(Abbv); 174 175 // Abbrev for TYPE_CODE_STRUCT. 176 Abbv = new BitCodeAbbrev(); 177 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT)); 178 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked 179 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 180 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 181 Log2_32_Ceil(VE.getTypes().size()+1))); 182 unsigned StructAbbrev = Stream.EmitAbbrev(Abbv); 183 184 // Abbrev for TYPE_CODE_UNION. 185 Abbv = new BitCodeAbbrev(); 186 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_UNION)); 187 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 188 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 189 Log2_32_Ceil(VE.getTypes().size()+1))); 190 unsigned UnionAbbrev = Stream.EmitAbbrev(Abbv); 191 192 // Abbrev for TYPE_CODE_ARRAY. 193 Abbv = new BitCodeAbbrev(); 194 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_ARRAY)); 195 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // size 196 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 197 Log2_32_Ceil(VE.getTypes().size()+1))); 198 unsigned ArrayAbbrev = Stream.EmitAbbrev(Abbv); 199 200 // Emit an entry count so the reader can reserve space. 201 TypeVals.push_back(TypeList.size()); 202 Stream.EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals); 203 TypeVals.clear(); 204 205 // Loop over all of the types, emitting each in turn. 206 for (unsigned i = 0, e = TypeList.size(); i != e; ++i) { 207 const Type *T = TypeList[i].first; 208 int AbbrevToUse = 0; 209 unsigned Code = 0; 210 211 switch (T->getTypeID()) { 212 default: llvm_unreachable("Unknown type!"); 213 case Type::VoidTyID: Code = bitc::TYPE_CODE_VOID; break; 214 case Type::FloatTyID: Code = bitc::TYPE_CODE_FLOAT; break; 215 case Type::DoubleTyID: Code = bitc::TYPE_CODE_DOUBLE; break; 216 case Type::X86_FP80TyID: Code = bitc::TYPE_CODE_X86_FP80; break; 217 case Type::FP128TyID: Code = bitc::TYPE_CODE_FP128; break; 218 case Type::PPC_FP128TyID: Code = bitc::TYPE_CODE_PPC_FP128; break; 219 case Type::LabelTyID: Code = bitc::TYPE_CODE_LABEL; break; 220 case Type::OpaqueTyID: Code = bitc::TYPE_CODE_OPAQUE; break; 221 case Type::MetadataTyID: Code = bitc::TYPE_CODE_METADATA; break; 222 case Type::IntegerTyID: 223 // INTEGER: [width] 224 Code = bitc::TYPE_CODE_INTEGER; 225 TypeVals.push_back(cast<IntegerType>(T)->getBitWidth()); 226 break; 227 case Type::PointerTyID: { 228 const PointerType *PTy = cast<PointerType>(T); 229 // POINTER: [pointee type, address space] 230 Code = bitc::TYPE_CODE_POINTER; 231 TypeVals.push_back(VE.getTypeID(PTy->getElementType())); 232 unsigned AddressSpace = PTy->getAddressSpace(); 233 TypeVals.push_back(AddressSpace); 234 if (AddressSpace == 0) AbbrevToUse = PtrAbbrev; 235 break; 236 } 237 case Type::FunctionTyID: { 238 const FunctionType *FT = cast<FunctionType>(T); 239 // FUNCTION: [isvararg, attrid, retty, paramty x N] 240 Code = bitc::TYPE_CODE_FUNCTION; 241 TypeVals.push_back(FT->isVarArg()); 242 TypeVals.push_back(0); // FIXME: DEAD: remove in llvm 3.0 243 TypeVals.push_back(VE.getTypeID(FT->getReturnType())); 244 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) 245 TypeVals.push_back(VE.getTypeID(FT->getParamType(i))); 246 AbbrevToUse = FunctionAbbrev; 247 break; 248 } 249 case Type::StructTyID: { 250 const StructType *ST = cast<StructType>(T); 251 // STRUCT: [ispacked, eltty x N] 252 Code = bitc::TYPE_CODE_STRUCT; 253 TypeVals.push_back(ST->isPacked()); 254 // Output all of the element types. 255 for (StructType::element_iterator I = ST->element_begin(), 256 E = ST->element_end(); I != E; ++I) 257 TypeVals.push_back(VE.getTypeID(*I)); 258 AbbrevToUse = StructAbbrev; 259 break; 260 } 261 case Type::UnionTyID: { 262 const UnionType *UT = cast<UnionType>(T); 263 // UNION: [eltty x N] 264 Code = bitc::TYPE_CODE_UNION; 265 // Output all of the element types. 266 for (UnionType::element_iterator I = UT->element_begin(), 267 E = UT->element_end(); I != E; ++I) 268 TypeVals.push_back(VE.getTypeID(*I)); 269 AbbrevToUse = UnionAbbrev; 270 break; 271 } 272 case Type::ArrayTyID: { 273 const ArrayType *AT = cast<ArrayType>(T); 274 // ARRAY: [numelts, eltty] 275 Code = bitc::TYPE_CODE_ARRAY; 276 TypeVals.push_back(AT->getNumElements()); 277 TypeVals.push_back(VE.getTypeID(AT->getElementType())); 278 AbbrevToUse = ArrayAbbrev; 279 break; 280 } 281 case Type::VectorTyID: { 282 const VectorType *VT = cast<VectorType>(T); 283 // VECTOR [numelts, eltty] 284 Code = bitc::TYPE_CODE_VECTOR; 285 TypeVals.push_back(VT->getNumElements()); 286 TypeVals.push_back(VE.getTypeID(VT->getElementType())); 287 break; 288 } 289 } 290 291 // Emit the finished record. 292 Stream.EmitRecord(Code, TypeVals, AbbrevToUse); 293 TypeVals.clear(); 294 } 295 296 Stream.ExitBlock(); 297} 298 299static unsigned getEncodedLinkage(const GlobalValue *GV) { 300 switch (GV->getLinkage()) { 301 default: llvm_unreachable("Invalid linkage!"); 302 case GlobalValue::ExternalLinkage: return 0; 303 case GlobalValue::WeakAnyLinkage: return 1; 304 case GlobalValue::AppendingLinkage: return 2; 305 case GlobalValue::InternalLinkage: return 3; 306 case GlobalValue::LinkOnceAnyLinkage: return 4; 307 case GlobalValue::DLLImportLinkage: return 5; 308 case GlobalValue::DLLExportLinkage: return 6; 309 case GlobalValue::ExternalWeakLinkage: return 7; 310 case GlobalValue::CommonLinkage: return 8; 311 case GlobalValue::PrivateLinkage: return 9; 312 case GlobalValue::WeakODRLinkage: return 10; 313 case GlobalValue::LinkOnceODRLinkage: return 11; 314 case GlobalValue::AvailableExternallyLinkage: return 12; 315 case GlobalValue::LinkerPrivateLinkage: return 13; 316 } 317} 318 319static unsigned getEncodedVisibility(const GlobalValue *GV) { 320 switch (GV->getVisibility()) { 321 default: llvm_unreachable("Invalid visibility!"); 322 case GlobalValue::DefaultVisibility: return 0; 323 case GlobalValue::HiddenVisibility: return 1; 324 case GlobalValue::ProtectedVisibility: return 2; 325 } 326} 327 328// Emit top-level description of module, including target triple, inline asm, 329// descriptors for global variables, and function prototype info. 330static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE, 331 BitstreamWriter &Stream) { 332 // Emit the list of dependent libraries for the Module. 333 for (Module::lib_iterator I = M->lib_begin(), E = M->lib_end(); I != E; ++I) 334 WriteStringRecord(bitc::MODULE_CODE_DEPLIB, *I, 0/*TODO*/, Stream); 335 336 // Emit various pieces of data attached to a module. 337 if (!M->getTargetTriple().empty()) 338 WriteStringRecord(bitc::MODULE_CODE_TRIPLE, M->getTargetTriple(), 339 0/*TODO*/, Stream); 340 if (!M->getDataLayout().empty()) 341 WriteStringRecord(bitc::MODULE_CODE_DATALAYOUT, M->getDataLayout(), 342 0/*TODO*/, Stream); 343 if (!M->getModuleInlineAsm().empty()) 344 WriteStringRecord(bitc::MODULE_CODE_ASM, M->getModuleInlineAsm(), 345 0/*TODO*/, Stream); 346 347 // Emit information about sections and GC, computing how many there are. Also 348 // compute the maximum alignment value. 349 std::map<std::string, unsigned> SectionMap; 350 std::map<std::string, unsigned> GCMap; 351 unsigned MaxAlignment = 0; 352 unsigned MaxGlobalType = 0; 353 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end(); 354 GV != E; ++GV) { 355 MaxAlignment = std::max(MaxAlignment, GV->getAlignment()); 356 MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV->getType())); 357 358 if (!GV->hasSection()) continue; 359 // Give section names unique ID's. 360 unsigned &Entry = SectionMap[GV->getSection()]; 361 if (Entry != 0) continue; 362 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, GV->getSection(), 363 0/*TODO*/, Stream); 364 Entry = SectionMap.size(); 365 } 366 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) { 367 MaxAlignment = std::max(MaxAlignment, F->getAlignment()); 368 if (F->hasSection()) { 369 // Give section names unique ID's. 370 unsigned &Entry = SectionMap[F->getSection()]; 371 if (!Entry) { 372 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, F->getSection(), 373 0/*TODO*/, Stream); 374 Entry = SectionMap.size(); 375 } 376 } 377 if (F->hasGC()) { 378 // Same for GC names. 379 unsigned &Entry = GCMap[F->getGC()]; 380 if (!Entry) { 381 WriteStringRecord(bitc::MODULE_CODE_GCNAME, F->getGC(), 382 0/*TODO*/, Stream); 383 Entry = GCMap.size(); 384 } 385 } 386 } 387 388 // Emit abbrev for globals, now that we know # sections and max alignment. 389 unsigned SimpleGVarAbbrev = 0; 390 if (!M->global_empty()) { 391 // Add an abbrev for common globals with no visibility or thread localness. 392 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 393 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR)); 394 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 395 Log2_32_Ceil(MaxGlobalType+1))); 396 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constant. 397 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer. 398 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // Linkage. 399 if (MaxAlignment == 0) // Alignment. 400 Abbv->Add(BitCodeAbbrevOp(0)); 401 else { 402 unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1; 403 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 404 Log2_32_Ceil(MaxEncAlignment+1))); 405 } 406 if (SectionMap.empty()) // Section. 407 Abbv->Add(BitCodeAbbrevOp(0)); 408 else 409 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 410 Log2_32_Ceil(SectionMap.size()+1))); 411 // Don't bother emitting vis + thread local. 412 SimpleGVarAbbrev = Stream.EmitAbbrev(Abbv); 413 } 414 415 // Emit the global variable information. 416 SmallVector<unsigned, 64> Vals; 417 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end(); 418 GV != E; ++GV) { 419 unsigned AbbrevToUse = 0; 420 421 // GLOBALVAR: [type, isconst, initid, 422 // linkage, alignment, section, visibility, threadlocal] 423 Vals.push_back(VE.getTypeID(GV->getType())); 424 Vals.push_back(GV->isConstant()); 425 Vals.push_back(GV->isDeclaration() ? 0 : 426 (VE.getValueID(GV->getInitializer()) + 1)); 427 Vals.push_back(getEncodedLinkage(GV)); 428 Vals.push_back(Log2_32(GV->getAlignment())+1); 429 Vals.push_back(GV->hasSection() ? SectionMap[GV->getSection()] : 0); 430 if (GV->isThreadLocal() || 431 GV->getVisibility() != GlobalValue::DefaultVisibility) { 432 Vals.push_back(getEncodedVisibility(GV)); 433 Vals.push_back(GV->isThreadLocal()); 434 } else { 435 AbbrevToUse = SimpleGVarAbbrev; 436 } 437 438 Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse); 439 Vals.clear(); 440 } 441 442 // Emit the function proto information. 443 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) { 444 // FUNCTION: [type, callingconv, isproto, paramattr, 445 // linkage, alignment, section, visibility, gc] 446 Vals.push_back(VE.getTypeID(F->getType())); 447 Vals.push_back(F->getCallingConv()); 448 Vals.push_back(F->isDeclaration()); 449 Vals.push_back(getEncodedLinkage(F)); 450 Vals.push_back(VE.getAttributeID(F->getAttributes())); 451 Vals.push_back(Log2_32(F->getAlignment())+1); 452 Vals.push_back(F->hasSection() ? SectionMap[F->getSection()] : 0); 453 Vals.push_back(getEncodedVisibility(F)); 454 Vals.push_back(F->hasGC() ? GCMap[F->getGC()] : 0); 455 456 unsigned AbbrevToUse = 0; 457 Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse); 458 Vals.clear(); 459 } 460 461 462 // Emit the alias information. 463 for (Module::const_alias_iterator AI = M->alias_begin(), E = M->alias_end(); 464 AI != E; ++AI) { 465 Vals.push_back(VE.getTypeID(AI->getType())); 466 Vals.push_back(VE.getValueID(AI->getAliasee())); 467 Vals.push_back(getEncodedLinkage(AI)); 468 Vals.push_back(getEncodedVisibility(AI)); 469 unsigned AbbrevToUse = 0; 470 Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse); 471 Vals.clear(); 472 } 473} 474 475static uint64_t GetOptimizationFlags(const Value *V) { 476 uint64_t Flags = 0; 477 478 if (const OverflowingBinaryOperator *OBO = 479 dyn_cast<OverflowingBinaryOperator>(V)) { 480 if (OBO->hasNoSignedWrap()) 481 Flags |= 1 << bitc::OBO_NO_SIGNED_WRAP; 482 if (OBO->hasNoUnsignedWrap()) 483 Flags |= 1 << bitc::OBO_NO_UNSIGNED_WRAP; 484 } else if (const SDivOperator *Div = dyn_cast<SDivOperator>(V)) { 485 if (Div->isExact()) 486 Flags |= 1 << bitc::SDIV_EXACT; 487 } 488 489 return Flags; 490} 491 492static void WriteMDNode(const MDNode *N, 493 const ValueEnumerator &VE, 494 BitstreamWriter &Stream, 495 SmallVector<uint64_t, 64> &Record) { 496 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) { 497 if (N->getOperand(i)) { 498 Record.push_back(VE.getTypeID(N->getOperand(i)->getType())); 499 Record.push_back(VE.getValueID(N->getOperand(i))); 500 } else { 501 Record.push_back(VE.getTypeID(Type::getVoidTy(N->getContext()))); 502 Record.push_back(0); 503 } 504 } 505 unsigned MDCode = N->isFunctionLocal() ? bitc::METADATA_FN_NODE : 506 bitc::METADATA_NODE; 507 Stream.EmitRecord(MDCode, Record, 0); 508 Record.clear(); 509} 510 511static void WriteModuleMetadata(const ValueEnumerator &VE, 512 BitstreamWriter &Stream) { 513 const ValueEnumerator::ValueList &Vals = VE.getMDValues(); 514 bool StartedMetadataBlock = false; 515 unsigned MDSAbbrev = 0; 516 SmallVector<uint64_t, 64> Record; 517 for (unsigned i = 0, e = Vals.size(); i != e; ++i) { 518 519 if (const MDNode *N = dyn_cast<MDNode>(Vals[i].first)) { 520 if (!N->isFunctionLocal() || !N->getFunction()) { 521 if (!StartedMetadataBlock) { 522 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 523 StartedMetadataBlock = true; 524 } 525 WriteMDNode(N, VE, Stream, Record); 526 } 527 } else if (const MDString *MDS = dyn_cast<MDString>(Vals[i].first)) { 528 if (!StartedMetadataBlock) { 529 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 530 531 // Abbrev for METADATA_STRING. 532 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 533 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_STRING)); 534 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 535 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 536 MDSAbbrev = Stream.EmitAbbrev(Abbv); 537 StartedMetadataBlock = true; 538 } 539 540 // Code: [strchar x N] 541 Record.append(MDS->begin(), MDS->end()); 542 543 // Emit the finished record. 544 Stream.EmitRecord(bitc::METADATA_STRING, Record, MDSAbbrev); 545 Record.clear(); 546 } else if (const NamedMDNode *NMD = dyn_cast<NamedMDNode>(Vals[i].first)) { 547 if (!StartedMetadataBlock) { 548 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 549 StartedMetadataBlock = true; 550 } 551 552 // Write name. 553 StringRef Str = NMD->getName(); 554 for (unsigned i = 0, e = Str.size(); i != e; ++i) 555 Record.push_back(Str[i]); 556 Stream.EmitRecord(bitc::METADATA_NAME, Record, 0/*TODO*/); 557 Record.clear(); 558 559 // Write named metadata operands. 560 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) { 561 if (NMD->getOperand(i)) 562 Record.push_back(VE.getValueID(NMD->getOperand(i))); 563 else 564 Record.push_back(~0U); 565 } 566 Stream.EmitRecord(bitc::METADATA_NAMED_NODE, Record, 0); 567 Record.clear(); 568 } 569 } 570 571 if (StartedMetadataBlock) 572 Stream.ExitBlock(); 573} 574 575static void WriteFunctionLocalMetadata(const Function &F, 576 const ValueEnumerator &VE, 577 BitstreamWriter &Stream) { 578 bool StartedMetadataBlock = false; 579 SmallVector<uint64_t, 64> Record; 580 const ValueEnumerator::ValueList &Vals = VE.getMDValues(); 581 582 for (unsigned i = 0, e = Vals.size(); i != e; ++i) 583 if (const MDNode *N = dyn_cast<MDNode>(Vals[i].first)) 584 if (N->isFunctionLocal() && N->getFunction() == &F) { 585 if (!StartedMetadataBlock) { 586 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 587 StartedMetadataBlock = true; 588 } 589 WriteMDNode(N, VE, Stream, Record); 590 } 591 592 if (StartedMetadataBlock) 593 Stream.ExitBlock(); 594} 595 596static void WriteMetadataAttachment(const Function &F, 597 const ValueEnumerator &VE, 598 BitstreamWriter &Stream) { 599 bool StartedMetadataBlock = false; 600 SmallVector<uint64_t, 64> Record; 601 602 // Write metadata attachments 603 // METADATA_ATTACHMENT - [m x [value, [n x [id, mdnode]]] 604 SmallVector<std::pair<unsigned, MDNode*>, 4> MDs; 605 606 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) 607 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); 608 I != E; ++I) { 609 MDs.clear(); 610 I->getAllMetadata(MDs); 611 612 // If no metadata, ignore instruction. 613 if (MDs.empty()) continue; 614 615 Record.push_back(VE.getInstructionID(I)); 616 617 for (unsigned i = 0, e = MDs.size(); i != e; ++i) { 618 Record.push_back(MDs[i].first); 619 Record.push_back(VE.getValueID(MDs[i].second)); 620 } 621 if (!StartedMetadataBlock) { 622 Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3); 623 StartedMetadataBlock = true; 624 } 625 Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0); 626 Record.clear(); 627 } 628 629 if (StartedMetadataBlock) 630 Stream.ExitBlock(); 631} 632 633static void WriteModuleMetadataStore(const Module *M, BitstreamWriter &Stream) { 634 SmallVector<uint64_t, 64> Record; 635 636 // Write metadata kinds 637 // METADATA_KIND - [n x [id, name]] 638 SmallVector<StringRef, 4> Names; 639 M->getMDKindNames(Names); 640 641 assert(Names[0] == "" && "MDKind #0 is invalid"); 642 if (Names.size() == 1) return; 643 644 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 645 646 for (unsigned MDKindID = 1, e = Names.size(); MDKindID != e; ++MDKindID) { 647 Record.push_back(MDKindID); 648 StringRef KName = Names[MDKindID]; 649 Record.append(KName.begin(), KName.end()); 650 651 Stream.EmitRecord(bitc::METADATA_KIND, Record, 0); 652 Record.clear(); 653 } 654 655 Stream.ExitBlock(); 656} 657 658static void WriteConstants(unsigned FirstVal, unsigned LastVal, 659 const ValueEnumerator &VE, 660 BitstreamWriter &Stream, bool isGlobal) { 661 if (FirstVal == LastVal) return; 662 663 Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4); 664 665 unsigned AggregateAbbrev = 0; 666 unsigned String8Abbrev = 0; 667 unsigned CString7Abbrev = 0; 668 unsigned CString6Abbrev = 0; 669 // If this is a constant pool for the module, emit module-specific abbrevs. 670 if (isGlobal) { 671 // Abbrev for CST_CODE_AGGREGATE. 672 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 673 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE)); 674 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 675 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1))); 676 AggregateAbbrev = Stream.EmitAbbrev(Abbv); 677 678 // Abbrev for CST_CODE_STRING. 679 Abbv = new BitCodeAbbrev(); 680 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING)); 681 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 682 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 683 String8Abbrev = Stream.EmitAbbrev(Abbv); 684 // Abbrev for CST_CODE_CSTRING. 685 Abbv = new BitCodeAbbrev(); 686 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING)); 687 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 688 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 689 CString7Abbrev = Stream.EmitAbbrev(Abbv); 690 // Abbrev for CST_CODE_CSTRING. 691 Abbv = new BitCodeAbbrev(); 692 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING)); 693 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 694 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 695 CString6Abbrev = Stream.EmitAbbrev(Abbv); 696 } 697 698 SmallVector<uint64_t, 64> Record; 699 700 const ValueEnumerator::ValueList &Vals = VE.getValues(); 701 const Type *LastTy = 0; 702 for (unsigned i = FirstVal; i != LastVal; ++i) { 703 const Value *V = Vals[i].first; 704 // If we need to switch types, do so now. 705 if (V->getType() != LastTy) { 706 LastTy = V->getType(); 707 Record.push_back(VE.getTypeID(LastTy)); 708 Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record, 709 CONSTANTS_SETTYPE_ABBREV); 710 Record.clear(); 711 } 712 713 if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) { 714 Record.push_back(unsigned(IA->hasSideEffects()) | 715 unsigned(IA->isAlignStack()) << 1); 716 717 // Add the asm string. 718 const std::string &AsmStr = IA->getAsmString(); 719 Record.push_back(AsmStr.size()); 720 for (unsigned i = 0, e = AsmStr.size(); i != e; ++i) 721 Record.push_back(AsmStr[i]); 722 723 // Add the constraint string. 724 const std::string &ConstraintStr = IA->getConstraintString(); 725 Record.push_back(ConstraintStr.size()); 726 for (unsigned i = 0, e = ConstraintStr.size(); i != e; ++i) 727 Record.push_back(ConstraintStr[i]); 728 Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record); 729 Record.clear(); 730 continue; 731 } 732 const Constant *C = cast<Constant>(V); 733 unsigned Code = -1U; 734 unsigned AbbrevToUse = 0; 735 if (C->isNullValue()) { 736 Code = bitc::CST_CODE_NULL; 737 } else if (isa<UndefValue>(C)) { 738 Code = bitc::CST_CODE_UNDEF; 739 } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) { 740 if (IV->getBitWidth() <= 64) { 741 int64_t V = IV->getSExtValue(); 742 if (V >= 0) 743 Record.push_back(V << 1); 744 else 745 Record.push_back((-V << 1) | 1); 746 Code = bitc::CST_CODE_INTEGER; 747 AbbrevToUse = CONSTANTS_INTEGER_ABBREV; 748 } else { // Wide integers, > 64 bits in size. 749 // We have an arbitrary precision integer value to write whose 750 // bit width is > 64. However, in canonical unsigned integer 751 // format it is likely that the high bits are going to be zero. 752 // So, we only write the number of active words. 753 unsigned NWords = IV->getValue().getActiveWords(); 754 const uint64_t *RawWords = IV->getValue().getRawData(); 755 for (unsigned i = 0; i != NWords; ++i) { 756 int64_t V = RawWords[i]; 757 if (V >= 0) 758 Record.push_back(V << 1); 759 else 760 Record.push_back((-V << 1) | 1); 761 } 762 Code = bitc::CST_CODE_WIDE_INTEGER; 763 } 764 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) { 765 Code = bitc::CST_CODE_FLOAT; 766 const Type *Ty = CFP->getType(); 767 if (Ty->isFloatTy() || Ty->isDoubleTy()) { 768 Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue()); 769 } else if (Ty->isX86_FP80Ty()) { 770 // api needed to prevent premature destruction 771 // bits are not in the same order as a normal i80 APInt, compensate. 772 APInt api = CFP->getValueAPF().bitcastToAPInt(); 773 const uint64_t *p = api.getRawData(); 774 Record.push_back((p[1] << 48) | (p[0] >> 16)); 775 Record.push_back(p[0] & 0xffffLL); 776 } else if (Ty->isFP128Ty() || Ty->isPPC_FP128Ty()) { 777 APInt api = CFP->getValueAPF().bitcastToAPInt(); 778 const uint64_t *p = api.getRawData(); 779 Record.push_back(p[0]); 780 Record.push_back(p[1]); 781 } else { 782 assert (0 && "Unknown FP type!"); 783 } 784 } else if (isa<ConstantArray>(C) && cast<ConstantArray>(C)->isString()) { 785 const ConstantArray *CA = cast<ConstantArray>(C); 786 // Emit constant strings specially. 787 unsigned NumOps = CA->getNumOperands(); 788 // If this is a null-terminated string, use the denser CSTRING encoding. 789 if (CA->getOperand(NumOps-1)->isNullValue()) { 790 Code = bitc::CST_CODE_CSTRING; 791 --NumOps; // Don't encode the null, which isn't allowed by char6. 792 } else { 793 Code = bitc::CST_CODE_STRING; 794 AbbrevToUse = String8Abbrev; 795 } 796 bool isCStr7 = Code == bitc::CST_CODE_CSTRING; 797 bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING; 798 for (unsigned i = 0; i != NumOps; ++i) { 799 unsigned char V = cast<ConstantInt>(CA->getOperand(i))->getZExtValue(); 800 Record.push_back(V); 801 isCStr7 &= (V & 128) == 0; 802 if (isCStrChar6) 803 isCStrChar6 = BitCodeAbbrevOp::isChar6(V); 804 } 805 806 if (isCStrChar6) 807 AbbrevToUse = CString6Abbrev; 808 else if (isCStr7) 809 AbbrevToUse = CString7Abbrev; 810 } else if (isa<ConstantArray>(C) || isa<ConstantStruct>(V) || 811 isa<ConstantUnion>(C) || isa<ConstantVector>(V)) { 812 Code = bitc::CST_CODE_AGGREGATE; 813 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i) 814 Record.push_back(VE.getValueID(C->getOperand(i))); 815 AbbrevToUse = AggregateAbbrev; 816 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) { 817 switch (CE->getOpcode()) { 818 default: 819 if (Instruction::isCast(CE->getOpcode())) { 820 Code = bitc::CST_CODE_CE_CAST; 821 Record.push_back(GetEncodedCastOpcode(CE->getOpcode())); 822 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 823 Record.push_back(VE.getValueID(C->getOperand(0))); 824 AbbrevToUse = CONSTANTS_CE_CAST_Abbrev; 825 } else { 826 assert(CE->getNumOperands() == 2 && "Unknown constant expr!"); 827 Code = bitc::CST_CODE_CE_BINOP; 828 Record.push_back(GetEncodedBinaryOpcode(CE->getOpcode())); 829 Record.push_back(VE.getValueID(C->getOperand(0))); 830 Record.push_back(VE.getValueID(C->getOperand(1))); 831 uint64_t Flags = GetOptimizationFlags(CE); 832 if (Flags != 0) 833 Record.push_back(Flags); 834 } 835 break; 836 case Instruction::GetElementPtr: 837 Code = bitc::CST_CODE_CE_GEP; 838 if (cast<GEPOperator>(C)->isInBounds()) 839 Code = bitc::CST_CODE_CE_INBOUNDS_GEP; 840 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) { 841 Record.push_back(VE.getTypeID(C->getOperand(i)->getType())); 842 Record.push_back(VE.getValueID(C->getOperand(i))); 843 } 844 break; 845 case Instruction::Select: 846 Code = bitc::CST_CODE_CE_SELECT; 847 Record.push_back(VE.getValueID(C->getOperand(0))); 848 Record.push_back(VE.getValueID(C->getOperand(1))); 849 Record.push_back(VE.getValueID(C->getOperand(2))); 850 break; 851 case Instruction::ExtractElement: 852 Code = bitc::CST_CODE_CE_EXTRACTELT; 853 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 854 Record.push_back(VE.getValueID(C->getOperand(0))); 855 Record.push_back(VE.getValueID(C->getOperand(1))); 856 break; 857 case Instruction::InsertElement: 858 Code = bitc::CST_CODE_CE_INSERTELT; 859 Record.push_back(VE.getValueID(C->getOperand(0))); 860 Record.push_back(VE.getValueID(C->getOperand(1))); 861 Record.push_back(VE.getValueID(C->getOperand(2))); 862 break; 863 case Instruction::ShuffleVector: 864 // If the return type and argument types are the same, this is a 865 // standard shufflevector instruction. If the types are different, 866 // then the shuffle is widening or truncating the input vectors, and 867 // the argument type must also be encoded. 868 if (C->getType() == C->getOperand(0)->getType()) { 869 Code = bitc::CST_CODE_CE_SHUFFLEVEC; 870 } else { 871 Code = bitc::CST_CODE_CE_SHUFVEC_EX; 872 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 873 } 874 Record.push_back(VE.getValueID(C->getOperand(0))); 875 Record.push_back(VE.getValueID(C->getOperand(1))); 876 Record.push_back(VE.getValueID(C->getOperand(2))); 877 break; 878 case Instruction::ICmp: 879 case Instruction::FCmp: 880 Code = bitc::CST_CODE_CE_CMP; 881 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 882 Record.push_back(VE.getValueID(C->getOperand(0))); 883 Record.push_back(VE.getValueID(C->getOperand(1))); 884 Record.push_back(CE->getPredicate()); 885 break; 886 } 887 } else if (const BlockAddress *BA = dyn_cast<BlockAddress>(C)) { 888 assert(BA->getFunction() == BA->getBasicBlock()->getParent() && 889 "Malformed blockaddress"); 890 Code = bitc::CST_CODE_BLOCKADDRESS; 891 Record.push_back(VE.getTypeID(BA->getFunction()->getType())); 892 Record.push_back(VE.getValueID(BA->getFunction())); 893 Record.push_back(VE.getGlobalBasicBlockID(BA->getBasicBlock())); 894 } else { 895 llvm_unreachable("Unknown constant!"); 896 } 897 Stream.EmitRecord(Code, Record, AbbrevToUse); 898 Record.clear(); 899 } 900 901 Stream.ExitBlock(); 902} 903 904static void WriteModuleConstants(const ValueEnumerator &VE, 905 BitstreamWriter &Stream) { 906 const ValueEnumerator::ValueList &Vals = VE.getValues(); 907 908 // Find the first constant to emit, which is the first non-globalvalue value. 909 // We know globalvalues have been emitted by WriteModuleInfo. 910 for (unsigned i = 0, e = Vals.size(); i != e; ++i) { 911 if (!isa<GlobalValue>(Vals[i].first)) { 912 WriteConstants(i, Vals.size(), VE, Stream, true); 913 return; 914 } 915 } 916} 917 918/// PushValueAndType - The file has to encode both the value and type id for 919/// many values, because we need to know what type to create for forward 920/// references. However, most operands are not forward references, so this type 921/// field is not needed. 922/// 923/// This function adds V's value ID to Vals. If the value ID is higher than the 924/// instruction ID, then it is a forward reference, and it also includes the 925/// type ID. 926static bool PushValueAndType(const Value *V, unsigned InstID, 927 SmallVector<unsigned, 64> &Vals, 928 ValueEnumerator &VE) { 929 unsigned ValID = VE.getValueID(V); 930 Vals.push_back(ValID); 931 if (ValID >= InstID) { 932 Vals.push_back(VE.getTypeID(V->getType())); 933 return true; 934 } 935 return false; 936} 937 938/// WriteInstruction - Emit an instruction to the specified stream. 939static void WriteInstruction(const Instruction &I, unsigned InstID, 940 ValueEnumerator &VE, BitstreamWriter &Stream, 941 SmallVector<unsigned, 64> &Vals) { 942 unsigned Code = 0; 943 unsigned AbbrevToUse = 0; 944 VE.setInstructionID(&I); 945 switch (I.getOpcode()) { 946 default: 947 if (Instruction::isCast(I.getOpcode())) { 948 Code = bitc::FUNC_CODE_INST_CAST; 949 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 950 AbbrevToUse = FUNCTION_INST_CAST_ABBREV; 951 Vals.push_back(VE.getTypeID(I.getType())); 952 Vals.push_back(GetEncodedCastOpcode(I.getOpcode())); 953 } else { 954 assert(isa<BinaryOperator>(I) && "Unknown instruction!"); 955 Code = bitc::FUNC_CODE_INST_BINOP; 956 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 957 AbbrevToUse = FUNCTION_INST_BINOP_ABBREV; 958 Vals.push_back(VE.getValueID(I.getOperand(1))); 959 Vals.push_back(GetEncodedBinaryOpcode(I.getOpcode())); 960 uint64_t Flags = GetOptimizationFlags(&I); 961 if (Flags != 0) { 962 if (AbbrevToUse == FUNCTION_INST_BINOP_ABBREV) 963 AbbrevToUse = FUNCTION_INST_BINOP_FLAGS_ABBREV; 964 Vals.push_back(Flags); 965 } 966 } 967 break; 968 969 case Instruction::GetElementPtr: 970 Code = bitc::FUNC_CODE_INST_GEP; 971 if (cast<GEPOperator>(&I)->isInBounds()) 972 Code = bitc::FUNC_CODE_INST_INBOUNDS_GEP; 973 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 974 PushValueAndType(I.getOperand(i), InstID, Vals, VE); 975 break; 976 case Instruction::ExtractValue: { 977 Code = bitc::FUNC_CODE_INST_EXTRACTVAL; 978 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 979 const ExtractValueInst *EVI = cast<ExtractValueInst>(&I); 980 for (const unsigned *i = EVI->idx_begin(), *e = EVI->idx_end(); i != e; ++i) 981 Vals.push_back(*i); 982 break; 983 } 984 case Instruction::InsertValue: { 985 Code = bitc::FUNC_CODE_INST_INSERTVAL; 986 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 987 PushValueAndType(I.getOperand(1), InstID, Vals, VE); 988 const InsertValueInst *IVI = cast<InsertValueInst>(&I); 989 for (const unsigned *i = IVI->idx_begin(), *e = IVI->idx_end(); i != e; ++i) 990 Vals.push_back(*i); 991 break; 992 } 993 case Instruction::Select: 994 Code = bitc::FUNC_CODE_INST_VSELECT; 995 PushValueAndType(I.getOperand(1), InstID, Vals, VE); 996 Vals.push_back(VE.getValueID(I.getOperand(2))); 997 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 998 break; 999 case Instruction::ExtractElement: 1000 Code = bitc::FUNC_CODE_INST_EXTRACTELT; 1001 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1002 Vals.push_back(VE.getValueID(I.getOperand(1))); 1003 break; 1004 case Instruction::InsertElement: 1005 Code = bitc::FUNC_CODE_INST_INSERTELT; 1006 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1007 Vals.push_back(VE.getValueID(I.getOperand(1))); 1008 Vals.push_back(VE.getValueID(I.getOperand(2))); 1009 break; 1010 case Instruction::ShuffleVector: 1011 Code = bitc::FUNC_CODE_INST_SHUFFLEVEC; 1012 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1013 Vals.push_back(VE.getValueID(I.getOperand(1))); 1014 Vals.push_back(VE.getValueID(I.getOperand(2))); 1015 break; 1016 case Instruction::ICmp: 1017 case Instruction::FCmp: 1018 // compare returning Int1Ty or vector of Int1Ty 1019 Code = bitc::FUNC_CODE_INST_CMP2; 1020 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1021 Vals.push_back(VE.getValueID(I.getOperand(1))); 1022 Vals.push_back(cast<CmpInst>(I).getPredicate()); 1023 break; 1024 1025 case Instruction::Ret: 1026 { 1027 Code = bitc::FUNC_CODE_INST_RET; 1028 unsigned NumOperands = I.getNumOperands(); 1029 if (NumOperands == 0) 1030 AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV; 1031 else if (NumOperands == 1) { 1032 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 1033 AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV; 1034 } else { 1035 for (unsigned i = 0, e = NumOperands; i != e; ++i) 1036 PushValueAndType(I.getOperand(i), InstID, Vals, VE); 1037 } 1038 } 1039 break; 1040 case Instruction::Br: 1041 { 1042 Code = bitc::FUNC_CODE_INST_BR; 1043 BranchInst &II = cast<BranchInst>(I); 1044 Vals.push_back(VE.getValueID(II.getSuccessor(0))); 1045 if (II.isConditional()) { 1046 Vals.push_back(VE.getValueID(II.getSuccessor(1))); 1047 Vals.push_back(VE.getValueID(II.getCondition())); 1048 } 1049 } 1050 break; 1051 case Instruction::Switch: 1052 Code = bitc::FUNC_CODE_INST_SWITCH; 1053 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 1054 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 1055 Vals.push_back(VE.getValueID(I.getOperand(i))); 1056 break; 1057 case Instruction::IndirectBr: 1058 Code = bitc::FUNC_CODE_INST_INDIRECTBR; 1059 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 1060 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 1061 Vals.push_back(VE.getValueID(I.getOperand(i))); 1062 break; 1063 1064 case Instruction::Invoke: { 1065 const InvokeInst *II = cast<InvokeInst>(&I); 1066 const Value *Callee(II->getCalledValue()); 1067 const PointerType *PTy = cast<PointerType>(Callee->getType()); 1068 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 1069 Code = bitc::FUNC_CODE_INST_INVOKE; 1070 1071 Vals.push_back(VE.getAttributeID(II->getAttributes())); 1072 Vals.push_back(II->getCallingConv()); 1073 Vals.push_back(VE.getValueID(II->getNormalDest())); 1074 Vals.push_back(VE.getValueID(II->getUnwindDest())); 1075 PushValueAndType(Callee, InstID, Vals, VE); 1076 1077 // Emit value #'s for the fixed parameters. 1078 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) 1079 Vals.push_back(VE.getValueID(I.getOperand(i+3))); // fixed param. 1080 1081 // Emit type/value pairs for varargs params. 1082 if (FTy->isVarArg()) { 1083 for (unsigned i = 3+FTy->getNumParams(), e = I.getNumOperands(); 1084 i != e; ++i) 1085 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // vararg 1086 } 1087 break; 1088 } 1089 case Instruction::Unwind: 1090 Code = bitc::FUNC_CODE_INST_UNWIND; 1091 break; 1092 case Instruction::Unreachable: 1093 Code = bitc::FUNC_CODE_INST_UNREACHABLE; 1094 AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV; 1095 break; 1096 1097 case Instruction::PHI: 1098 Code = bitc::FUNC_CODE_INST_PHI; 1099 Vals.push_back(VE.getTypeID(I.getType())); 1100 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 1101 Vals.push_back(VE.getValueID(I.getOperand(i))); 1102 break; 1103 1104 case Instruction::Alloca: 1105 Code = bitc::FUNC_CODE_INST_ALLOCA; 1106 Vals.push_back(VE.getTypeID(I.getType())); 1107 Vals.push_back(VE.getValueID(I.getOperand(0))); // size. 1108 Vals.push_back(Log2_32(cast<AllocaInst>(I).getAlignment())+1); 1109 break; 1110 1111 case Instruction::Load: 1112 Code = bitc::FUNC_CODE_INST_LOAD; 1113 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) // ptr 1114 AbbrevToUse = FUNCTION_INST_LOAD_ABBREV; 1115 1116 Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1); 1117 Vals.push_back(cast<LoadInst>(I).isVolatile()); 1118 break; 1119 case Instruction::Store: 1120 Code = bitc::FUNC_CODE_INST_STORE2; 1121 PushValueAndType(I.getOperand(1), InstID, Vals, VE); // ptrty + ptr 1122 Vals.push_back(VE.getValueID(I.getOperand(0))); // val. 1123 Vals.push_back(Log2_32(cast<StoreInst>(I).getAlignment())+1); 1124 Vals.push_back(cast<StoreInst>(I).isVolatile()); 1125 break; 1126 case Instruction::Call: { 1127 const PointerType *PTy = cast<PointerType>(I.getOperand(0)->getType()); 1128 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 1129 1130 Code = bitc::FUNC_CODE_INST_CALL; 1131 1132 const CallInst *CI = cast<CallInst>(&I); 1133 Vals.push_back(VE.getAttributeID(CI->getAttributes())); 1134 Vals.push_back((CI->getCallingConv() << 1) | unsigned(CI->isTailCall())); 1135 PushValueAndType(CI->getOperand(0), InstID, Vals, VE); // Callee 1136 1137 // Emit value #'s for the fixed parameters. 1138 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) 1139 Vals.push_back(VE.getValueID(I.getOperand(i+1))); // fixed param. 1140 1141 // Emit type/value pairs for varargs params. 1142 if (FTy->isVarArg()) { 1143 unsigned NumVarargs = I.getNumOperands()-1-FTy->getNumParams(); 1144 for (unsigned i = I.getNumOperands()-NumVarargs, e = I.getNumOperands(); 1145 i != e; ++i) 1146 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // varargs 1147 } 1148 break; 1149 } 1150 case Instruction::VAArg: 1151 Code = bitc::FUNC_CODE_INST_VAARG; 1152 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); // valistty 1153 Vals.push_back(VE.getValueID(I.getOperand(0))); // valist. 1154 Vals.push_back(VE.getTypeID(I.getType())); // restype. 1155 break; 1156 } 1157 1158 Stream.EmitRecord(Code, Vals, AbbrevToUse); 1159 Vals.clear(); 1160} 1161 1162// Emit names for globals/functions etc. 1163static void WriteValueSymbolTable(const ValueSymbolTable &VST, 1164 const ValueEnumerator &VE, 1165 BitstreamWriter &Stream) { 1166 if (VST.empty()) return; 1167 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4); 1168 1169 // FIXME: Set up the abbrev, we know how many values there are! 1170 // FIXME: We know if the type names can use 7-bit ascii. 1171 SmallVector<unsigned, 64> NameVals; 1172 1173 for (ValueSymbolTable::const_iterator SI = VST.begin(), SE = VST.end(); 1174 SI != SE; ++SI) { 1175 1176 const ValueName &Name = *SI; 1177 1178 // Figure out the encoding to use for the name. 1179 bool is7Bit = true; 1180 bool isChar6 = true; 1181 for (const char *C = Name.getKeyData(), *E = C+Name.getKeyLength(); 1182 C != E; ++C) { 1183 if (isChar6) 1184 isChar6 = BitCodeAbbrevOp::isChar6(*C); 1185 if ((unsigned char)*C & 128) { 1186 is7Bit = false; 1187 break; // don't bother scanning the rest. 1188 } 1189 } 1190 1191 unsigned AbbrevToUse = VST_ENTRY_8_ABBREV; 1192 1193 // VST_ENTRY: [valueid, namechar x N] 1194 // VST_BBENTRY: [bbid, namechar x N] 1195 unsigned Code; 1196 if (isa<BasicBlock>(SI->getValue())) { 1197 Code = bitc::VST_CODE_BBENTRY; 1198 if (isChar6) 1199 AbbrevToUse = VST_BBENTRY_6_ABBREV; 1200 } else { 1201 Code = bitc::VST_CODE_ENTRY; 1202 if (isChar6) 1203 AbbrevToUse = VST_ENTRY_6_ABBREV; 1204 else if (is7Bit) 1205 AbbrevToUse = VST_ENTRY_7_ABBREV; 1206 } 1207 1208 NameVals.push_back(VE.getValueID(SI->getValue())); 1209 for (const char *P = Name.getKeyData(), 1210 *E = Name.getKeyData()+Name.getKeyLength(); P != E; ++P) 1211 NameVals.push_back((unsigned char)*P); 1212 1213 // Emit the finished record. 1214 Stream.EmitRecord(Code, NameVals, AbbrevToUse); 1215 NameVals.clear(); 1216 } 1217 Stream.ExitBlock(); 1218} 1219 1220/// WriteFunction - Emit a function body to the module stream. 1221static void WriteFunction(const Function &F, ValueEnumerator &VE, 1222 BitstreamWriter &Stream) { 1223 Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4); 1224 VE.incorporateFunction(F); 1225 1226 SmallVector<unsigned, 64> Vals; 1227 1228 // Emit the number of basic blocks, so the reader can create them ahead of 1229 // time. 1230 Vals.push_back(VE.getBasicBlocks().size()); 1231 Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals); 1232 Vals.clear(); 1233 1234 // If there are function-local constants, emit them now. 1235 unsigned CstStart, CstEnd; 1236 VE.getFunctionConstantRange(CstStart, CstEnd); 1237 WriteConstants(CstStart, CstEnd, VE, Stream, false); 1238 1239 // If there is function-local metadata, emit it now. 1240 WriteFunctionLocalMetadata(F, VE, Stream); 1241 1242 // Keep a running idea of what the instruction ID is. 1243 unsigned InstID = CstEnd; 1244 1245 // Finally, emit all the instructions, in order. 1246 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) 1247 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); 1248 I != E; ++I) { 1249 WriteInstruction(*I, InstID, VE, Stream, Vals); 1250 if (!I->getType()->isVoidTy()) 1251 ++InstID; 1252 } 1253 1254 // Emit names for all the instructions etc. 1255 WriteValueSymbolTable(F.getValueSymbolTable(), VE, Stream); 1256 1257 WriteMetadataAttachment(F, VE, Stream); 1258 VE.purgeFunction(); 1259 Stream.ExitBlock(); 1260} 1261 1262/// WriteTypeSymbolTable - Emit a block for the specified type symtab. 1263static void WriteTypeSymbolTable(const TypeSymbolTable &TST, 1264 const ValueEnumerator &VE, 1265 BitstreamWriter &Stream) { 1266 if (TST.empty()) return; 1267 1268 Stream.EnterSubblock(bitc::TYPE_SYMTAB_BLOCK_ID, 3); 1269 1270 // 7-bit fixed width VST_CODE_ENTRY strings. 1271 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1272 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 1273 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1274 Log2_32_Ceil(VE.getTypes().size()+1))); 1275 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1276 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 1277 unsigned V7Abbrev = Stream.EmitAbbrev(Abbv); 1278 1279 SmallVector<unsigned, 64> NameVals; 1280 1281 for (TypeSymbolTable::const_iterator TI = TST.begin(), TE = TST.end(); 1282 TI != TE; ++TI) { 1283 // TST_ENTRY: [typeid, namechar x N] 1284 NameVals.push_back(VE.getTypeID(TI->second)); 1285 1286 const std::string &Str = TI->first; 1287 bool is7Bit = true; 1288 for (unsigned i = 0, e = Str.size(); i != e; ++i) { 1289 NameVals.push_back((unsigned char)Str[i]); 1290 if (Str[i] & 128) 1291 is7Bit = false; 1292 } 1293 1294 // Emit the finished record. 1295 Stream.EmitRecord(bitc::VST_CODE_ENTRY, NameVals, is7Bit ? V7Abbrev : 0); 1296 NameVals.clear(); 1297 } 1298 1299 Stream.ExitBlock(); 1300} 1301 1302// Emit blockinfo, which defines the standard abbreviations etc. 1303static void WriteBlockInfo(const ValueEnumerator &VE, BitstreamWriter &Stream) { 1304 // We only want to emit block info records for blocks that have multiple 1305 // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK. Other 1306 // blocks can defined their abbrevs inline. 1307 Stream.EnterBlockInfoBlock(2); 1308 1309 { // 8-bit fixed-width VST_ENTRY/VST_BBENTRY strings. 1310 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1311 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); 1312 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1313 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1314 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 1315 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1316 Abbv) != VST_ENTRY_8_ABBREV) 1317 llvm_unreachable("Unexpected abbrev ordering!"); 1318 } 1319 1320 { // 7-bit fixed width VST_ENTRY strings. 1321 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1322 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 1323 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1324 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1325 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 1326 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1327 Abbv) != VST_ENTRY_7_ABBREV) 1328 llvm_unreachable("Unexpected abbrev ordering!"); 1329 } 1330 { // 6-bit char6 VST_ENTRY strings. 1331 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1332 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 1333 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1334 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1335 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 1336 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1337 Abbv) != VST_ENTRY_6_ABBREV) 1338 llvm_unreachable("Unexpected abbrev ordering!"); 1339 } 1340 { // 6-bit char6 VST_BBENTRY strings. 1341 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1342 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY)); 1343 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1344 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1345 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 1346 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1347 Abbv) != VST_BBENTRY_6_ABBREV) 1348 llvm_unreachable("Unexpected abbrev ordering!"); 1349 } 1350 1351 1352 1353 { // SETTYPE abbrev for CONSTANTS_BLOCK. 1354 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1355 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE)); 1356 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1357 Log2_32_Ceil(VE.getTypes().size()+1))); 1358 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1359 Abbv) != CONSTANTS_SETTYPE_ABBREV) 1360 llvm_unreachable("Unexpected abbrev ordering!"); 1361 } 1362 1363 { // INTEGER abbrev for CONSTANTS_BLOCK. 1364 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1365 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER)); 1366 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1367 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1368 Abbv) != CONSTANTS_INTEGER_ABBREV) 1369 llvm_unreachable("Unexpected abbrev ordering!"); 1370 } 1371 1372 { // CE_CAST abbrev for CONSTANTS_BLOCK. 1373 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1374 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST)); 1375 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // cast opc 1376 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid 1377 Log2_32_Ceil(VE.getTypes().size()+1))); 1378 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id 1379 1380 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1381 Abbv) != CONSTANTS_CE_CAST_Abbrev) 1382 llvm_unreachable("Unexpected abbrev ordering!"); 1383 } 1384 { // NULL abbrev for CONSTANTS_BLOCK. 1385 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1386 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL)); 1387 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1388 Abbv) != CONSTANTS_NULL_Abbrev) 1389 llvm_unreachable("Unexpected abbrev ordering!"); 1390 } 1391 1392 // FIXME: This should only use space for first class types! 1393 1394 { // INST_LOAD abbrev for FUNCTION_BLOCK. 1395 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1396 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD)); 1397 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr 1398 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align 1399 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile 1400 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1401 Abbv) != FUNCTION_INST_LOAD_ABBREV) 1402 llvm_unreachable("Unexpected abbrev ordering!"); 1403 } 1404 { // INST_BINOP abbrev for FUNCTION_BLOCK. 1405 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1406 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP)); 1407 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS 1408 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS 1409 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1410 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1411 Abbv) != FUNCTION_INST_BINOP_ABBREV) 1412 llvm_unreachable("Unexpected abbrev ordering!"); 1413 } 1414 { // INST_BINOP_FLAGS abbrev for FUNCTION_BLOCK. 1415 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1416 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP)); 1417 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS 1418 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS 1419 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1420 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); // flags 1421 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1422 Abbv) != FUNCTION_INST_BINOP_FLAGS_ABBREV) 1423 llvm_unreachable("Unexpected abbrev ordering!"); 1424 } 1425 { // INST_CAST abbrev for FUNCTION_BLOCK. 1426 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1427 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST)); 1428 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // OpVal 1429 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty 1430 Log2_32_Ceil(VE.getTypes().size()+1))); 1431 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1432 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1433 Abbv) != FUNCTION_INST_CAST_ABBREV) 1434 llvm_unreachable("Unexpected abbrev ordering!"); 1435 } 1436 1437 { // INST_RET abbrev for FUNCTION_BLOCK. 1438 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1439 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET)); 1440 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1441 Abbv) != FUNCTION_INST_RET_VOID_ABBREV) 1442 llvm_unreachable("Unexpected abbrev ordering!"); 1443 } 1444 { // INST_RET abbrev for FUNCTION_BLOCK. 1445 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1446 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET)); 1447 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID 1448 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1449 Abbv) != FUNCTION_INST_RET_VAL_ABBREV) 1450 llvm_unreachable("Unexpected abbrev ordering!"); 1451 } 1452 { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK. 1453 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1454 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE)); 1455 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1456 Abbv) != FUNCTION_INST_UNREACHABLE_ABBREV) 1457 llvm_unreachable("Unexpected abbrev ordering!"); 1458 } 1459 1460 Stream.ExitBlock(); 1461} 1462 1463 1464/// WriteModule - Emit the specified module to the bitstream. 1465static void WriteModule(const Module *M, BitstreamWriter &Stream) { 1466 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3); 1467 1468 // Emit the version number if it is non-zero. 1469 if (CurVersion) { 1470 SmallVector<unsigned, 1> Vals; 1471 Vals.push_back(CurVersion); 1472 Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals); 1473 } 1474 1475 // Analyze the module, enumerating globals, functions, etc. 1476 ValueEnumerator VE(M); 1477 1478 // Emit blockinfo, which defines the standard abbreviations etc. 1479 WriteBlockInfo(VE, Stream); 1480 1481 // Emit information about parameter attributes. 1482 WriteAttributeTable(VE, Stream); 1483 1484 // Emit information describing all of the types in the module. 1485 WriteTypeTable(VE, Stream); 1486 1487 // Emit top-level description of module, including target triple, inline asm, 1488 // descriptors for global variables, and function prototype info. 1489 WriteModuleInfo(M, VE, Stream); 1490 1491 // Emit constants. 1492 WriteModuleConstants(VE, Stream); 1493 1494 // Emit metadata. 1495 WriteModuleMetadata(VE, Stream); 1496 1497 // Emit function bodies. 1498 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) 1499 if (!I->isDeclaration()) 1500 WriteFunction(*I, VE, Stream); 1501 1502 // Emit metadata. 1503 WriteModuleMetadataStore(M, Stream); 1504 1505 // Emit the type symbol table information. 1506 WriteTypeSymbolTable(M->getTypeSymbolTable(), VE, Stream); 1507 1508 // Emit names for globals/functions etc. 1509 WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream); 1510 1511 Stream.ExitBlock(); 1512} 1513 1514/// EmitDarwinBCHeader - If generating a bc file on darwin, we have to emit a 1515/// header and trailer to make it compatible with the system archiver. To do 1516/// this we emit the following header, and then emit a trailer that pads the 1517/// file out to be a multiple of 16 bytes. 1518/// 1519/// struct bc_header { 1520/// uint32_t Magic; // 0x0B17C0DE 1521/// uint32_t Version; // Version, currently always 0. 1522/// uint32_t BitcodeOffset; // Offset to traditional bitcode file. 1523/// uint32_t BitcodeSize; // Size of traditional bitcode file. 1524/// uint32_t CPUType; // CPU specifier. 1525/// ... potentially more later ... 1526/// }; 1527enum { 1528 DarwinBCSizeFieldOffset = 3*4, // Offset to bitcode_size. 1529 DarwinBCHeaderSize = 5*4 1530}; 1531 1532/// isARMTriplet - Return true if the triplet looks like: 1533/// arm-*, thumb-*, armv[0-9]-*, thumbv[0-9]-*, armv5te-*, or armv6t2-*. 1534static bool isARMTriplet(const std::string &TT) { 1535 size_t Pos = 0; 1536 size_t Size = TT.size(); 1537 if (Size >= 6 && 1538 TT[0] == 't' && TT[1] == 'h' && TT[2] == 'u' && 1539 TT[3] == 'm' && TT[4] == 'b') 1540 Pos = 5; 1541 else if (Size >= 4 && TT[0] == 'a' && TT[1] == 'r' && TT[2] == 'm') 1542 Pos = 3; 1543 else 1544 return false; 1545 1546 if (TT[Pos] == '-') 1547 return true; 1548 else if (TT[Pos] == 'v') { 1549 if (Size >= Pos+4 && 1550 TT[Pos+1] == '6' && TT[Pos+2] == 't' && TT[Pos+3] == '2') 1551 return true; 1552 else if (Size >= Pos+4 && 1553 TT[Pos+1] == '5' && TT[Pos+2] == 't' && TT[Pos+3] == 'e') 1554 return true; 1555 } else 1556 return false; 1557 while (++Pos < Size && TT[Pos] != '-') { 1558 if (!isdigit(TT[Pos])) 1559 return false; 1560 } 1561 return true; 1562} 1563 1564static void EmitDarwinBCHeader(BitstreamWriter &Stream, 1565 const std::string &TT) { 1566 unsigned CPUType = ~0U; 1567 1568 // Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*, arm-*, thumb-*, 1569 // armv[0-9]-*, thumbv[0-9]-*, armv5te-*, or armv6t2-*. The CPUType is a magic 1570 // number from /usr/include/mach/machine.h. It is ok to reproduce the 1571 // specific constants here because they are implicitly part of the Darwin ABI. 1572 enum { 1573 DARWIN_CPU_ARCH_ABI64 = 0x01000000, 1574 DARWIN_CPU_TYPE_X86 = 7, 1575 DARWIN_CPU_TYPE_ARM = 12, 1576 DARWIN_CPU_TYPE_POWERPC = 18 1577 }; 1578 1579 if (TT.find("x86_64-") == 0) 1580 CPUType = DARWIN_CPU_TYPE_X86 | DARWIN_CPU_ARCH_ABI64; 1581 else if (TT.size() >= 5 && TT[0] == 'i' && TT[2] == '8' && TT[3] == '6' && 1582 TT[4] == '-' && TT[1] - '3' < 6) 1583 CPUType = DARWIN_CPU_TYPE_X86; 1584 else if (TT.find("powerpc-") == 0) 1585 CPUType = DARWIN_CPU_TYPE_POWERPC; 1586 else if (TT.find("powerpc64-") == 0) 1587 CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64; 1588 else if (isARMTriplet(TT)) 1589 CPUType = DARWIN_CPU_TYPE_ARM; 1590 1591 // Traditional Bitcode starts after header. 1592 unsigned BCOffset = DarwinBCHeaderSize; 1593 1594 Stream.Emit(0x0B17C0DE, 32); 1595 Stream.Emit(0 , 32); // Version. 1596 Stream.Emit(BCOffset , 32); 1597 Stream.Emit(0 , 32); // Filled in later. 1598 Stream.Emit(CPUType , 32); 1599} 1600 1601/// EmitDarwinBCTrailer - Emit the darwin epilog after the bitcode file and 1602/// finalize the header. 1603static void EmitDarwinBCTrailer(BitstreamWriter &Stream, unsigned BufferSize) { 1604 // Update the size field in the header. 1605 Stream.BackpatchWord(DarwinBCSizeFieldOffset, BufferSize-DarwinBCHeaderSize); 1606 1607 // If the file is not a multiple of 16 bytes, insert dummy padding. 1608 while (BufferSize & 15) { 1609 Stream.Emit(0, 8); 1610 ++BufferSize; 1611 } 1612} 1613 1614 1615/// WriteBitcodeToFile - Write the specified module to the specified output 1616/// stream. 1617void llvm::WriteBitcodeToFile(const Module *M, raw_ostream &Out) { 1618 std::vector<unsigned char> Buffer; 1619 BitstreamWriter Stream(Buffer); 1620 1621 Buffer.reserve(256*1024); 1622 1623 WriteBitcodeToStream( M, Stream ); 1624 1625 // If writing to stdout, set binary mode. 1626 if (&llvm::outs() == &Out) 1627 sys::Program::ChangeStdoutToBinary(); 1628 1629 // Write the generated bitstream to "Out". 1630 Out.write((char*)&Buffer.front(), Buffer.size()); 1631 1632 // Make sure it hits disk now. 1633 Out.flush(); 1634} 1635 1636/// WriteBitcodeToStream - Write the specified module to the specified output 1637/// stream. 1638void llvm::WriteBitcodeToStream(const Module *M, BitstreamWriter &Stream) { 1639 // If this is darwin, emit a file header and trailer if needed. 1640 bool isDarwin = M->getTargetTriple().find("-darwin") != std::string::npos; 1641 if (isDarwin) 1642 EmitDarwinBCHeader(Stream, M->getTargetTriple()); 1643 1644 // Emit the file header. 1645 Stream.Emit((unsigned)'B', 8); 1646 Stream.Emit((unsigned)'C', 8); 1647 Stream.Emit(0x0, 4); 1648 Stream.Emit(0xC, 4); 1649 Stream.Emit(0xE, 4); 1650 Stream.Emit(0xD, 4); 1651 1652 // Emit the module. 1653 WriteModule(M, Stream); 1654 1655 if (isDarwin) 1656 EmitDarwinBCTrailer(Stream, Stream.getBuffer().size()); 1657} 1658