BitcodeWriter.cpp revision 198396
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/raw_ostream.h" 30#include "llvm/System/Program.h" 31using namespace llvm; 32 33/// These are manifest constants used by the bitcode writer. They do not need to 34/// be kept in sync with the reader, but need to be consistent within this file. 35enum { 36 CurVersion = 0, 37 38 // VALUE_SYMTAB_BLOCK abbrev id's. 39 VST_ENTRY_8_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 40 VST_ENTRY_7_ABBREV, 41 VST_ENTRY_6_ABBREV, 42 VST_BBENTRY_6_ABBREV, 43 44 // CONSTANTS_BLOCK abbrev id's. 45 CONSTANTS_SETTYPE_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 46 CONSTANTS_INTEGER_ABBREV, 47 CONSTANTS_CE_CAST_Abbrev, 48 CONSTANTS_NULL_Abbrev, 49 50 // FUNCTION_BLOCK abbrev id's. 51 FUNCTION_INST_LOAD_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 52 FUNCTION_INST_BINOP_ABBREV, 53 FUNCTION_INST_BINOP_FLAGS_ABBREV, 54 FUNCTION_INST_CAST_ABBREV, 55 FUNCTION_INST_RET_VOID_ABBREV, 56 FUNCTION_INST_RET_VAL_ABBREV, 57 FUNCTION_INST_UNREACHABLE_ABBREV 58}; 59 60 61static unsigned GetEncodedCastOpcode(unsigned Opcode) { 62 switch (Opcode) { 63 default: llvm_unreachable("Unknown cast instruction!"); 64 case Instruction::Trunc : return bitc::CAST_TRUNC; 65 case Instruction::ZExt : return bitc::CAST_ZEXT; 66 case Instruction::SExt : return bitc::CAST_SEXT; 67 case Instruction::FPToUI : return bitc::CAST_FPTOUI; 68 case Instruction::FPToSI : return bitc::CAST_FPTOSI; 69 case Instruction::UIToFP : return bitc::CAST_UITOFP; 70 case Instruction::SIToFP : return bitc::CAST_SITOFP; 71 case Instruction::FPTrunc : return bitc::CAST_FPTRUNC; 72 case Instruction::FPExt : return bitc::CAST_FPEXT; 73 case Instruction::PtrToInt: return bitc::CAST_PTRTOINT; 74 case Instruction::IntToPtr: return bitc::CAST_INTTOPTR; 75 case Instruction::BitCast : return bitc::CAST_BITCAST; 76 } 77} 78 79static unsigned GetEncodedBinaryOpcode(unsigned Opcode) { 80 switch (Opcode) { 81 default: llvm_unreachable("Unknown binary instruction!"); 82 case Instruction::Add: 83 case Instruction::FAdd: return bitc::BINOP_ADD; 84 case Instruction::Sub: 85 case Instruction::FSub: return bitc::BINOP_SUB; 86 case Instruction::Mul: 87 case Instruction::FMul: return bitc::BINOP_MUL; 88 case Instruction::UDiv: return bitc::BINOP_UDIV; 89 case Instruction::FDiv: 90 case Instruction::SDiv: return bitc::BINOP_SDIV; 91 case Instruction::URem: return bitc::BINOP_UREM; 92 case Instruction::FRem: 93 case Instruction::SRem: return bitc::BINOP_SREM; 94 case Instruction::Shl: return bitc::BINOP_SHL; 95 case Instruction::LShr: return bitc::BINOP_LSHR; 96 case Instruction::AShr: return bitc::BINOP_ASHR; 97 case Instruction::And: return bitc::BINOP_AND; 98 case Instruction::Or: return bitc::BINOP_OR; 99 case Instruction::Xor: return bitc::BINOP_XOR; 100 } 101} 102 103 104 105static void WriteStringRecord(unsigned Code, const std::string &Str, 106 unsigned AbbrevToUse, BitstreamWriter &Stream) { 107 SmallVector<unsigned, 64> Vals; 108 109 // Code: [strchar x N] 110 for (unsigned i = 0, e = Str.size(); i != e; ++i) 111 Vals.push_back(Str[i]); 112 113 // Emit the finished record. 114 Stream.EmitRecord(Code, Vals, AbbrevToUse); 115} 116 117// Emit information about parameter attributes. 118static void WriteAttributeTable(const ValueEnumerator &VE, 119 BitstreamWriter &Stream) { 120 const std::vector<AttrListPtr> &Attrs = VE.getAttributes(); 121 if (Attrs.empty()) return; 122 123 Stream.EnterSubblock(bitc::PARAMATTR_BLOCK_ID, 3); 124 125 SmallVector<uint64_t, 64> Record; 126 for (unsigned i = 0, e = Attrs.size(); i != e; ++i) { 127 const AttrListPtr &A = Attrs[i]; 128 for (unsigned i = 0, e = A.getNumSlots(); i != e; ++i) { 129 const AttributeWithIndex &PAWI = A.getSlot(i); 130 Record.push_back(PAWI.Index); 131 132 // FIXME: remove in LLVM 3.0 133 // Store the alignment in the bitcode as a 16-bit raw value instead of a 134 // 5-bit log2 encoded value. Shift the bits above the alignment up by 135 // 11 bits. 136 uint64_t FauxAttr = PAWI.Attrs & 0xffff; 137 if (PAWI.Attrs & Attribute::Alignment) 138 FauxAttr |= (1ull<<16)<<(((PAWI.Attrs & Attribute::Alignment)-1) >> 16); 139 FauxAttr |= (PAWI.Attrs & (0x3FFull << 21)) << 11; 140 141 Record.push_back(FauxAttr); 142 } 143 144 Stream.EmitRecord(bitc::PARAMATTR_CODE_ENTRY, Record); 145 Record.clear(); 146 } 147 148 Stream.ExitBlock(); 149} 150 151/// WriteTypeTable - Write out the type table for a module. 152static void WriteTypeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) { 153 const ValueEnumerator::TypeList &TypeList = VE.getTypes(); 154 155 Stream.EnterSubblock(bitc::TYPE_BLOCK_ID, 4 /*count from # abbrevs */); 156 SmallVector<uint64_t, 64> TypeVals; 157 158 // Abbrev for TYPE_CODE_POINTER. 159 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 160 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_POINTER)); 161 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 162 Log2_32_Ceil(VE.getTypes().size()+1))); 163 Abbv->Add(BitCodeAbbrevOp(0)); // Addrspace = 0 164 unsigned PtrAbbrev = Stream.EmitAbbrev(Abbv); 165 166 // Abbrev for TYPE_CODE_FUNCTION. 167 Abbv = new BitCodeAbbrev(); 168 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_FUNCTION)); 169 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isvararg 170 Abbv->Add(BitCodeAbbrevOp(0)); // FIXME: DEAD value, remove in LLVM 3.0 171 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 172 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 173 Log2_32_Ceil(VE.getTypes().size()+1))); 174 unsigned FunctionAbbrev = Stream.EmitAbbrev(Abbv); 175 176 // Abbrev for TYPE_CODE_STRUCT. 177 Abbv = new BitCodeAbbrev(); 178 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT)); 179 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked 180 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 181 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 182 Log2_32_Ceil(VE.getTypes().size()+1))); 183 unsigned StructAbbrev = Stream.EmitAbbrev(Abbv); 184 185 // Abbrev for TYPE_CODE_ARRAY. 186 Abbv = new BitCodeAbbrev(); 187 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_ARRAY)); 188 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // size 189 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 190 Log2_32_Ceil(VE.getTypes().size()+1))); 191 unsigned ArrayAbbrev = Stream.EmitAbbrev(Abbv); 192 193 // Emit an entry count so the reader can reserve space. 194 TypeVals.push_back(TypeList.size()); 195 Stream.EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals); 196 TypeVals.clear(); 197 198 // Loop over all of the types, emitting each in turn. 199 for (unsigned i = 0, e = TypeList.size(); i != e; ++i) { 200 const Type *T = TypeList[i].first; 201 int AbbrevToUse = 0; 202 unsigned Code = 0; 203 204 switch (T->getTypeID()) { 205 default: llvm_unreachable("Unknown type!"); 206 case Type::VoidTyID: Code = bitc::TYPE_CODE_VOID; break; 207 case Type::FloatTyID: Code = bitc::TYPE_CODE_FLOAT; break; 208 case Type::DoubleTyID: Code = bitc::TYPE_CODE_DOUBLE; break; 209 case Type::X86_FP80TyID: Code = bitc::TYPE_CODE_X86_FP80; break; 210 case Type::FP128TyID: Code = bitc::TYPE_CODE_FP128; break; 211 case Type::PPC_FP128TyID: Code = bitc::TYPE_CODE_PPC_FP128; break; 212 case Type::LabelTyID: Code = bitc::TYPE_CODE_LABEL; break; 213 case Type::OpaqueTyID: Code = bitc::TYPE_CODE_OPAQUE; break; 214 case Type::MetadataTyID: Code = bitc::TYPE_CODE_METADATA; break; 215 case Type::IntegerTyID: 216 // INTEGER: [width] 217 Code = bitc::TYPE_CODE_INTEGER; 218 TypeVals.push_back(cast<IntegerType>(T)->getBitWidth()); 219 break; 220 case Type::PointerTyID: { 221 const PointerType *PTy = cast<PointerType>(T); 222 // POINTER: [pointee type, address space] 223 Code = bitc::TYPE_CODE_POINTER; 224 TypeVals.push_back(VE.getTypeID(PTy->getElementType())); 225 unsigned AddressSpace = PTy->getAddressSpace(); 226 TypeVals.push_back(AddressSpace); 227 if (AddressSpace == 0) AbbrevToUse = PtrAbbrev; 228 break; 229 } 230 case Type::FunctionTyID: { 231 const FunctionType *FT = cast<FunctionType>(T); 232 // FUNCTION: [isvararg, attrid, retty, paramty x N] 233 Code = bitc::TYPE_CODE_FUNCTION; 234 TypeVals.push_back(FT->isVarArg()); 235 TypeVals.push_back(0); // FIXME: DEAD: remove in llvm 3.0 236 TypeVals.push_back(VE.getTypeID(FT->getReturnType())); 237 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) 238 TypeVals.push_back(VE.getTypeID(FT->getParamType(i))); 239 AbbrevToUse = FunctionAbbrev; 240 break; 241 } 242 case Type::StructTyID: { 243 const StructType *ST = cast<StructType>(T); 244 // STRUCT: [ispacked, eltty x N] 245 Code = bitc::TYPE_CODE_STRUCT; 246 TypeVals.push_back(ST->isPacked()); 247 // Output all of the element types. 248 for (StructType::element_iterator I = ST->element_begin(), 249 E = ST->element_end(); I != E; ++I) 250 TypeVals.push_back(VE.getTypeID(*I)); 251 AbbrevToUse = StructAbbrev; 252 break; 253 } 254 case Type::ArrayTyID: { 255 const ArrayType *AT = cast<ArrayType>(T); 256 // ARRAY: [numelts, eltty] 257 Code = bitc::TYPE_CODE_ARRAY; 258 TypeVals.push_back(AT->getNumElements()); 259 TypeVals.push_back(VE.getTypeID(AT->getElementType())); 260 AbbrevToUse = ArrayAbbrev; 261 break; 262 } 263 case Type::VectorTyID: { 264 const VectorType *VT = cast<VectorType>(T); 265 // VECTOR [numelts, eltty] 266 Code = bitc::TYPE_CODE_VECTOR; 267 TypeVals.push_back(VT->getNumElements()); 268 TypeVals.push_back(VE.getTypeID(VT->getElementType())); 269 break; 270 } 271 } 272 273 // Emit the finished record. 274 Stream.EmitRecord(Code, TypeVals, AbbrevToUse); 275 TypeVals.clear(); 276 } 277 278 Stream.ExitBlock(); 279} 280 281static unsigned getEncodedLinkage(const GlobalValue *GV) { 282 switch (GV->getLinkage()) { 283 default: llvm_unreachable("Invalid linkage!"); 284 case GlobalValue::GhostLinkage: // Map ghost linkage onto external. 285 case GlobalValue::ExternalLinkage: return 0; 286 case GlobalValue::WeakAnyLinkage: return 1; 287 case GlobalValue::AppendingLinkage: return 2; 288 case GlobalValue::InternalLinkage: return 3; 289 case GlobalValue::LinkOnceAnyLinkage: return 4; 290 case GlobalValue::DLLImportLinkage: return 5; 291 case GlobalValue::DLLExportLinkage: return 6; 292 case GlobalValue::ExternalWeakLinkage: return 7; 293 case GlobalValue::CommonLinkage: return 8; 294 case GlobalValue::PrivateLinkage: return 9; 295 case GlobalValue::WeakODRLinkage: return 10; 296 case GlobalValue::LinkOnceODRLinkage: return 11; 297 case GlobalValue::AvailableExternallyLinkage: return 12; 298 case GlobalValue::LinkerPrivateLinkage: return 13; 299 } 300} 301 302static unsigned getEncodedVisibility(const GlobalValue *GV) { 303 switch (GV->getVisibility()) { 304 default: llvm_unreachable("Invalid visibility!"); 305 case GlobalValue::DefaultVisibility: return 0; 306 case GlobalValue::HiddenVisibility: return 1; 307 case GlobalValue::ProtectedVisibility: return 2; 308 } 309} 310 311// Emit top-level description of module, including target triple, inline asm, 312// descriptors for global variables, and function prototype info. 313static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE, 314 BitstreamWriter &Stream) { 315 // Emit the list of dependent libraries for the Module. 316 for (Module::lib_iterator I = M->lib_begin(), E = M->lib_end(); I != E; ++I) 317 WriteStringRecord(bitc::MODULE_CODE_DEPLIB, *I, 0/*TODO*/, Stream); 318 319 // Emit various pieces of data attached to a module. 320 if (!M->getTargetTriple().empty()) 321 WriteStringRecord(bitc::MODULE_CODE_TRIPLE, M->getTargetTriple(), 322 0/*TODO*/, Stream); 323 if (!M->getDataLayout().empty()) 324 WriteStringRecord(bitc::MODULE_CODE_DATALAYOUT, M->getDataLayout(), 325 0/*TODO*/, Stream); 326 if (!M->getModuleInlineAsm().empty()) 327 WriteStringRecord(bitc::MODULE_CODE_ASM, M->getModuleInlineAsm(), 328 0/*TODO*/, Stream); 329 330 // Emit information about sections and GC, computing how many there are. Also 331 // compute the maximum alignment value. 332 std::map<std::string, unsigned> SectionMap; 333 std::map<std::string, unsigned> GCMap; 334 unsigned MaxAlignment = 0; 335 unsigned MaxGlobalType = 0; 336 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end(); 337 GV != E; ++GV) { 338 MaxAlignment = std::max(MaxAlignment, GV->getAlignment()); 339 MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV->getType())); 340 341 if (!GV->hasSection()) continue; 342 // Give section names unique ID's. 343 unsigned &Entry = SectionMap[GV->getSection()]; 344 if (Entry != 0) continue; 345 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, GV->getSection(), 346 0/*TODO*/, Stream); 347 Entry = SectionMap.size(); 348 } 349 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) { 350 MaxAlignment = std::max(MaxAlignment, F->getAlignment()); 351 if (F->hasSection()) { 352 // Give section names unique ID's. 353 unsigned &Entry = SectionMap[F->getSection()]; 354 if (!Entry) { 355 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, F->getSection(), 356 0/*TODO*/, Stream); 357 Entry = SectionMap.size(); 358 } 359 } 360 if (F->hasGC()) { 361 // Same for GC names. 362 unsigned &Entry = GCMap[F->getGC()]; 363 if (!Entry) { 364 WriteStringRecord(bitc::MODULE_CODE_GCNAME, F->getGC(), 365 0/*TODO*/, Stream); 366 Entry = GCMap.size(); 367 } 368 } 369 } 370 371 // Emit abbrev for globals, now that we know # sections and max alignment. 372 unsigned SimpleGVarAbbrev = 0; 373 if (!M->global_empty()) { 374 // Add an abbrev for common globals with no visibility or thread localness. 375 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 376 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR)); 377 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 378 Log2_32_Ceil(MaxGlobalType+1))); 379 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constant. 380 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer. 381 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // Linkage. 382 if (MaxAlignment == 0) // Alignment. 383 Abbv->Add(BitCodeAbbrevOp(0)); 384 else { 385 unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1; 386 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 387 Log2_32_Ceil(MaxEncAlignment+1))); 388 } 389 if (SectionMap.empty()) // Section. 390 Abbv->Add(BitCodeAbbrevOp(0)); 391 else 392 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 393 Log2_32_Ceil(SectionMap.size()+1))); 394 // Don't bother emitting vis + thread local. 395 SimpleGVarAbbrev = Stream.EmitAbbrev(Abbv); 396 } 397 398 // Emit the global variable information. 399 SmallVector<unsigned, 64> Vals; 400 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end(); 401 GV != E; ++GV) { 402 unsigned AbbrevToUse = 0; 403 404 // GLOBALVAR: [type, isconst, initid, 405 // linkage, alignment, section, visibility, threadlocal] 406 Vals.push_back(VE.getTypeID(GV->getType())); 407 Vals.push_back(GV->isConstant()); 408 Vals.push_back(GV->isDeclaration() ? 0 : 409 (VE.getValueID(GV->getInitializer()) + 1)); 410 Vals.push_back(getEncodedLinkage(GV)); 411 Vals.push_back(Log2_32(GV->getAlignment())+1); 412 Vals.push_back(GV->hasSection() ? SectionMap[GV->getSection()] : 0); 413 if (GV->isThreadLocal() || 414 GV->getVisibility() != GlobalValue::DefaultVisibility) { 415 Vals.push_back(getEncodedVisibility(GV)); 416 Vals.push_back(GV->isThreadLocal()); 417 } else { 418 AbbrevToUse = SimpleGVarAbbrev; 419 } 420 421 Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse); 422 Vals.clear(); 423 } 424 425 // Emit the function proto information. 426 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) { 427 // FUNCTION: [type, callingconv, isproto, paramattr, 428 // linkage, alignment, section, visibility, gc] 429 Vals.push_back(VE.getTypeID(F->getType())); 430 Vals.push_back(F->getCallingConv()); 431 Vals.push_back(F->isDeclaration()); 432 Vals.push_back(getEncodedLinkage(F)); 433 Vals.push_back(VE.getAttributeID(F->getAttributes())); 434 Vals.push_back(Log2_32(F->getAlignment())+1); 435 Vals.push_back(F->hasSection() ? SectionMap[F->getSection()] : 0); 436 Vals.push_back(getEncodedVisibility(F)); 437 Vals.push_back(F->hasGC() ? GCMap[F->getGC()] : 0); 438 439 unsigned AbbrevToUse = 0; 440 Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse); 441 Vals.clear(); 442 } 443 444 445 // Emit the alias information. 446 for (Module::const_alias_iterator AI = M->alias_begin(), E = M->alias_end(); 447 AI != E; ++AI) { 448 Vals.push_back(VE.getTypeID(AI->getType())); 449 Vals.push_back(VE.getValueID(AI->getAliasee())); 450 Vals.push_back(getEncodedLinkage(AI)); 451 Vals.push_back(getEncodedVisibility(AI)); 452 unsigned AbbrevToUse = 0; 453 Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse); 454 Vals.clear(); 455 } 456} 457 458static uint64_t GetOptimizationFlags(const Value *V) { 459 uint64_t Flags = 0; 460 461 if (const OverflowingBinaryOperator *OBO = 462 dyn_cast<OverflowingBinaryOperator>(V)) { 463 if (OBO->hasNoSignedWrap()) 464 Flags |= 1 << bitc::OBO_NO_SIGNED_WRAP; 465 if (OBO->hasNoUnsignedWrap()) 466 Flags |= 1 << bitc::OBO_NO_UNSIGNED_WRAP; 467 } else if (const SDivOperator *Div = dyn_cast<SDivOperator>(V)) { 468 if (Div->isExact()) 469 Flags |= 1 << bitc::SDIV_EXACT; 470 } 471 472 return Flags; 473} 474 475static void WriteMDNode(const MDNode *N, 476 const ValueEnumerator &VE, 477 BitstreamWriter &Stream, 478 SmallVector<uint64_t, 64> &Record) { 479 for (unsigned i = 0, e = N->getNumElements(); i != e; ++i) { 480 if (N->getElement(i)) { 481 Record.push_back(VE.getTypeID(N->getElement(i)->getType())); 482 Record.push_back(VE.getValueID(N->getElement(i))); 483 } else { 484 Record.push_back(VE.getTypeID(Type::getVoidTy(N->getContext()))); 485 Record.push_back(0); 486 } 487 } 488 Stream.EmitRecord(bitc::METADATA_NODE, Record, 0); 489 Record.clear(); 490} 491 492static void WriteModuleMetadata(const ValueEnumerator &VE, 493 BitstreamWriter &Stream) { 494 const ValueEnumerator::ValueList &Vals = VE.getMDValues(); 495 bool StartedMetadataBlock = false; 496 unsigned MDSAbbrev = 0; 497 SmallVector<uint64_t, 64> Record; 498 for (unsigned i = 0, e = Vals.size(); i != e; ++i) { 499 500 if (const MDNode *N = dyn_cast<MDNode>(Vals[i].first)) { 501 if (!StartedMetadataBlock) { 502 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 503 StartedMetadataBlock = true; 504 } 505 WriteMDNode(N, VE, Stream, Record); 506 } else if (const MDString *MDS = dyn_cast<MDString>(Vals[i].first)) { 507 if (!StartedMetadataBlock) { 508 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 509 510 // Abbrev for METADATA_STRING. 511 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 512 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_STRING)); 513 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 514 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 515 MDSAbbrev = Stream.EmitAbbrev(Abbv); 516 StartedMetadataBlock = true; 517 } 518 519 // Code: [strchar x N] 520 Record.append(MDS->begin(), MDS->end()); 521 522 // Emit the finished record. 523 Stream.EmitRecord(bitc::METADATA_STRING, Record, MDSAbbrev); 524 Record.clear(); 525 } else if (const NamedMDNode *NMD = dyn_cast<NamedMDNode>(Vals[i].first)) { 526 if (!StartedMetadataBlock) { 527 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 528 StartedMetadataBlock = true; 529 } 530 531 // Write name. 532 std::string Str = NMD->getNameStr(); 533 const char *StrBegin = Str.c_str(); 534 for (unsigned i = 0, e = Str.length(); i != e; ++i) 535 Record.push_back(StrBegin[i]); 536 Stream.EmitRecord(bitc::METADATA_NAME, Record, 0/*TODO*/); 537 Record.clear(); 538 539 // Write named metadata elements. 540 for (unsigned i = 0, e = NMD->getNumElements(); i != e; ++i) { 541 if (NMD->getElement(i)) 542 Record.push_back(VE.getValueID(NMD->getElement(i))); 543 else 544 Record.push_back(0); 545 } 546 Stream.EmitRecord(bitc::METADATA_NAMED_NODE, Record, 0); 547 Record.clear(); 548 } 549 } 550 551 if (StartedMetadataBlock) 552 Stream.ExitBlock(); 553} 554 555static void WriteMetadataAttachment(const Function &F, 556 const ValueEnumerator &VE, 557 BitstreamWriter &Stream) { 558 bool StartedMetadataBlock = false; 559 SmallVector<uint64_t, 64> Record; 560 561 // Write metadata attachments 562 // METADATA_ATTACHMENT - [m x [value, [n x [id, mdnode]]] 563 MetadataContext &TheMetadata = F.getContext().getMetadata(); 564 typedef SmallVector<std::pair<unsigned, TrackingVH<MDNode> >, 2> MDMapTy; 565 MDMapTy MDs; 566 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) 567 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); 568 I != E; ++I) { 569 MDs.clear(); 570 TheMetadata.getMDs(I, MDs); 571 bool RecordedInstruction = false; 572 for (MDMapTy::const_iterator PI = MDs.begin(), PE = MDs.end(); 573 PI != PE; ++PI) { 574 if (RecordedInstruction == false) { 575 Record.push_back(VE.getInstructionID(I)); 576 RecordedInstruction = true; 577 } 578 Record.push_back(PI->first); 579 Record.push_back(VE.getValueID(PI->second)); 580 } 581 if (!Record.empty()) { 582 if (!StartedMetadataBlock) { 583 Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3); 584 StartedMetadataBlock = true; 585 } 586 Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0); 587 Record.clear(); 588 } 589 } 590 591 if (StartedMetadataBlock) 592 Stream.ExitBlock(); 593} 594 595static void WriteModuleMetadataStore(const Module *M, 596 const ValueEnumerator &VE, 597 BitstreamWriter &Stream) { 598 599 bool StartedMetadataBlock = false; 600 SmallVector<uint64_t, 64> Record; 601 602 // Write metadata kinds 603 // METADATA_KIND - [n x [id, name]] 604 MetadataContext &TheMetadata = M->getContext().getMetadata(); 605 SmallVector<std::pair<unsigned, StringRef>, 4> Names; 606 TheMetadata.getHandlerNames(Names); 607 for (SmallVector<std::pair<unsigned, StringRef>, 4>::iterator 608 I = Names.begin(), 609 E = Names.end(); I != E; ++I) { 610 Record.push_back(I->first); 611 StringRef KName = I->second; 612 for (unsigned i = 0, e = KName.size(); i != e; ++i) 613 Record.push_back(KName[i]); 614 if (!StartedMetadataBlock) { 615 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 616 StartedMetadataBlock = true; 617 } 618 Stream.EmitRecord(bitc::METADATA_KIND, Record, 0); 619 Record.clear(); 620 } 621 622 if (StartedMetadataBlock) 623 Stream.ExitBlock(); 624} 625 626static void WriteConstants(unsigned FirstVal, unsigned LastVal, 627 const ValueEnumerator &VE, 628 BitstreamWriter &Stream, bool isGlobal) { 629 if (FirstVal == LastVal) return; 630 631 Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4); 632 633 unsigned AggregateAbbrev = 0; 634 unsigned String8Abbrev = 0; 635 unsigned CString7Abbrev = 0; 636 unsigned CString6Abbrev = 0; 637 // If this is a constant pool for the module, emit module-specific abbrevs. 638 if (isGlobal) { 639 // Abbrev for CST_CODE_AGGREGATE. 640 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 641 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE)); 642 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 643 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1))); 644 AggregateAbbrev = Stream.EmitAbbrev(Abbv); 645 646 // Abbrev for CST_CODE_STRING. 647 Abbv = new BitCodeAbbrev(); 648 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING)); 649 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 650 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 651 String8Abbrev = Stream.EmitAbbrev(Abbv); 652 // Abbrev for CST_CODE_CSTRING. 653 Abbv = new BitCodeAbbrev(); 654 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING)); 655 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 656 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 657 CString7Abbrev = Stream.EmitAbbrev(Abbv); 658 // Abbrev for CST_CODE_CSTRING. 659 Abbv = new BitCodeAbbrev(); 660 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING)); 661 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 662 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 663 CString6Abbrev = Stream.EmitAbbrev(Abbv); 664 } 665 666 SmallVector<uint64_t, 64> Record; 667 668 const ValueEnumerator::ValueList &Vals = VE.getValues(); 669 const Type *LastTy = 0; 670 for (unsigned i = FirstVal; i != LastVal; ++i) { 671 const Value *V = Vals[i].first; 672 // If we need to switch types, do so now. 673 if (V->getType() != LastTy) { 674 LastTy = V->getType(); 675 Record.push_back(VE.getTypeID(LastTy)); 676 Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record, 677 CONSTANTS_SETTYPE_ABBREV); 678 Record.clear(); 679 } 680 681 if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) { 682 Record.push_back(unsigned(IA->hasSideEffects()) | 683 unsigned(IA->isAlignStack()) << 1); 684 685 // Add the asm string. 686 const std::string &AsmStr = IA->getAsmString(); 687 Record.push_back(AsmStr.size()); 688 for (unsigned i = 0, e = AsmStr.size(); i != e; ++i) 689 Record.push_back(AsmStr[i]); 690 691 // Add the constraint string. 692 const std::string &ConstraintStr = IA->getConstraintString(); 693 Record.push_back(ConstraintStr.size()); 694 for (unsigned i = 0, e = ConstraintStr.size(); i != e; ++i) 695 Record.push_back(ConstraintStr[i]); 696 Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record); 697 Record.clear(); 698 continue; 699 } 700 const Constant *C = cast<Constant>(V); 701 unsigned Code = -1U; 702 unsigned AbbrevToUse = 0; 703 if (C->isNullValue()) { 704 Code = bitc::CST_CODE_NULL; 705 } else if (isa<UndefValue>(C)) { 706 Code = bitc::CST_CODE_UNDEF; 707 } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) { 708 if (IV->getBitWidth() <= 64) { 709 int64_t V = IV->getSExtValue(); 710 if (V >= 0) 711 Record.push_back(V << 1); 712 else 713 Record.push_back((-V << 1) | 1); 714 Code = bitc::CST_CODE_INTEGER; 715 AbbrevToUse = CONSTANTS_INTEGER_ABBREV; 716 } else { // Wide integers, > 64 bits in size. 717 // We have an arbitrary precision integer value to write whose 718 // bit width is > 64. However, in canonical unsigned integer 719 // format it is likely that the high bits are going to be zero. 720 // So, we only write the number of active words. 721 unsigned NWords = IV->getValue().getActiveWords(); 722 const uint64_t *RawWords = IV->getValue().getRawData(); 723 for (unsigned i = 0; i != NWords; ++i) { 724 int64_t V = RawWords[i]; 725 if (V >= 0) 726 Record.push_back(V << 1); 727 else 728 Record.push_back((-V << 1) | 1); 729 } 730 Code = bitc::CST_CODE_WIDE_INTEGER; 731 } 732 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) { 733 Code = bitc::CST_CODE_FLOAT; 734 const Type *Ty = CFP->getType(); 735 if (Ty->isFloatTy() || Ty->isDoubleTy()) { 736 Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue()); 737 } else if (Ty->isX86_FP80Ty()) { 738 // api needed to prevent premature destruction 739 // bits are not in the same order as a normal i80 APInt, compensate. 740 APInt api = CFP->getValueAPF().bitcastToAPInt(); 741 const uint64_t *p = api.getRawData(); 742 Record.push_back((p[1] << 48) | (p[0] >> 16)); 743 Record.push_back(p[0] & 0xffffLL); 744 } else if (Ty->isFP128Ty() || Ty->isPPC_FP128Ty()) { 745 APInt api = CFP->getValueAPF().bitcastToAPInt(); 746 const uint64_t *p = api.getRawData(); 747 Record.push_back(p[0]); 748 Record.push_back(p[1]); 749 } else { 750 assert (0 && "Unknown FP type!"); 751 } 752 } else if (isa<ConstantArray>(C) && cast<ConstantArray>(C)->isString()) { 753 // Emit constant strings specially. 754 unsigned NumOps = C->getNumOperands(); 755 // If this is a null-terminated string, use the denser CSTRING encoding. 756 if (C->getOperand(NumOps-1)->isNullValue()) { 757 Code = bitc::CST_CODE_CSTRING; 758 --NumOps; // Don't encode the null, which isn't allowed by char6. 759 } else { 760 Code = bitc::CST_CODE_STRING; 761 AbbrevToUse = String8Abbrev; 762 } 763 bool isCStr7 = Code == bitc::CST_CODE_CSTRING; 764 bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING; 765 for (unsigned i = 0; i != NumOps; ++i) { 766 unsigned char V = cast<ConstantInt>(C->getOperand(i))->getZExtValue(); 767 Record.push_back(V); 768 isCStr7 &= (V & 128) == 0; 769 if (isCStrChar6) 770 isCStrChar6 = BitCodeAbbrevOp::isChar6(V); 771 } 772 773 if (isCStrChar6) 774 AbbrevToUse = CString6Abbrev; 775 else if (isCStr7) 776 AbbrevToUse = CString7Abbrev; 777 } else if (isa<ConstantArray>(C) || isa<ConstantStruct>(V) || 778 isa<ConstantVector>(V)) { 779 Code = bitc::CST_CODE_AGGREGATE; 780 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i) 781 Record.push_back(VE.getValueID(C->getOperand(i))); 782 AbbrevToUse = AggregateAbbrev; 783 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) { 784 switch (CE->getOpcode()) { 785 default: 786 if (Instruction::isCast(CE->getOpcode())) { 787 Code = bitc::CST_CODE_CE_CAST; 788 Record.push_back(GetEncodedCastOpcode(CE->getOpcode())); 789 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 790 Record.push_back(VE.getValueID(C->getOperand(0))); 791 AbbrevToUse = CONSTANTS_CE_CAST_Abbrev; 792 } else { 793 assert(CE->getNumOperands() == 2 && "Unknown constant expr!"); 794 Code = bitc::CST_CODE_CE_BINOP; 795 Record.push_back(GetEncodedBinaryOpcode(CE->getOpcode())); 796 Record.push_back(VE.getValueID(C->getOperand(0))); 797 Record.push_back(VE.getValueID(C->getOperand(1))); 798 uint64_t Flags = GetOptimizationFlags(CE); 799 if (Flags != 0) 800 Record.push_back(Flags); 801 } 802 break; 803 case Instruction::GetElementPtr: 804 Code = bitc::CST_CODE_CE_GEP; 805 if (cast<GEPOperator>(C)->isInBounds()) 806 Code = bitc::CST_CODE_CE_INBOUNDS_GEP; 807 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) { 808 Record.push_back(VE.getTypeID(C->getOperand(i)->getType())); 809 Record.push_back(VE.getValueID(C->getOperand(i))); 810 } 811 break; 812 case Instruction::Select: 813 Code = bitc::CST_CODE_CE_SELECT; 814 Record.push_back(VE.getValueID(C->getOperand(0))); 815 Record.push_back(VE.getValueID(C->getOperand(1))); 816 Record.push_back(VE.getValueID(C->getOperand(2))); 817 break; 818 case Instruction::ExtractElement: 819 Code = bitc::CST_CODE_CE_EXTRACTELT; 820 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 821 Record.push_back(VE.getValueID(C->getOperand(0))); 822 Record.push_back(VE.getValueID(C->getOperand(1))); 823 break; 824 case Instruction::InsertElement: 825 Code = bitc::CST_CODE_CE_INSERTELT; 826 Record.push_back(VE.getValueID(C->getOperand(0))); 827 Record.push_back(VE.getValueID(C->getOperand(1))); 828 Record.push_back(VE.getValueID(C->getOperand(2))); 829 break; 830 case Instruction::ShuffleVector: 831 // If the return type and argument types are the same, this is a 832 // standard shufflevector instruction. If the types are different, 833 // then the shuffle is widening or truncating the input vectors, and 834 // the argument type must also be encoded. 835 if (C->getType() == C->getOperand(0)->getType()) { 836 Code = bitc::CST_CODE_CE_SHUFFLEVEC; 837 } else { 838 Code = bitc::CST_CODE_CE_SHUFVEC_EX; 839 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 840 } 841 Record.push_back(VE.getValueID(C->getOperand(0))); 842 Record.push_back(VE.getValueID(C->getOperand(1))); 843 Record.push_back(VE.getValueID(C->getOperand(2))); 844 break; 845 case Instruction::ICmp: 846 case Instruction::FCmp: 847 Code = bitc::CST_CODE_CE_CMP; 848 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 849 Record.push_back(VE.getValueID(C->getOperand(0))); 850 Record.push_back(VE.getValueID(C->getOperand(1))); 851 Record.push_back(CE->getPredicate()); 852 break; 853 } 854 } else { 855 llvm_unreachable("Unknown constant!"); 856 } 857 Stream.EmitRecord(Code, Record, AbbrevToUse); 858 Record.clear(); 859 } 860 861 Stream.ExitBlock(); 862} 863 864static void WriteModuleConstants(const ValueEnumerator &VE, 865 BitstreamWriter &Stream) { 866 const ValueEnumerator::ValueList &Vals = VE.getValues(); 867 868 // Find the first constant to emit, which is the first non-globalvalue value. 869 // We know globalvalues have been emitted by WriteModuleInfo. 870 for (unsigned i = 0, e = Vals.size(); i != e; ++i) { 871 if (!isa<GlobalValue>(Vals[i].first)) { 872 WriteConstants(i, Vals.size(), VE, Stream, true); 873 return; 874 } 875 } 876} 877 878/// PushValueAndType - The file has to encode both the value and type id for 879/// many values, because we need to know what type to create for forward 880/// references. However, most operands are not forward references, so this type 881/// field is not needed. 882/// 883/// This function adds V's value ID to Vals. If the value ID is higher than the 884/// instruction ID, then it is a forward reference, and it also includes the 885/// type ID. 886static bool PushValueAndType(const Value *V, unsigned InstID, 887 SmallVector<unsigned, 64> &Vals, 888 ValueEnumerator &VE) { 889 unsigned ValID = VE.getValueID(V); 890 Vals.push_back(ValID); 891 if (ValID >= InstID) { 892 Vals.push_back(VE.getTypeID(V->getType())); 893 return true; 894 } 895 return false; 896} 897 898/// WriteInstruction - Emit an instruction to the specified stream. 899static void WriteInstruction(const Instruction &I, unsigned InstID, 900 ValueEnumerator &VE, BitstreamWriter &Stream, 901 SmallVector<unsigned, 64> &Vals) { 902 unsigned Code = 0; 903 unsigned AbbrevToUse = 0; 904 VE.setInstructionID(&I); 905 switch (I.getOpcode()) { 906 default: 907 if (Instruction::isCast(I.getOpcode())) { 908 Code = bitc::FUNC_CODE_INST_CAST; 909 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 910 AbbrevToUse = FUNCTION_INST_CAST_ABBREV; 911 Vals.push_back(VE.getTypeID(I.getType())); 912 Vals.push_back(GetEncodedCastOpcode(I.getOpcode())); 913 } else { 914 assert(isa<BinaryOperator>(I) && "Unknown instruction!"); 915 Code = bitc::FUNC_CODE_INST_BINOP; 916 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 917 AbbrevToUse = FUNCTION_INST_BINOP_ABBREV; 918 Vals.push_back(VE.getValueID(I.getOperand(1))); 919 Vals.push_back(GetEncodedBinaryOpcode(I.getOpcode())); 920 uint64_t Flags = GetOptimizationFlags(&I); 921 if (Flags != 0) { 922 if (AbbrevToUse == FUNCTION_INST_BINOP_ABBREV) 923 AbbrevToUse = FUNCTION_INST_BINOP_FLAGS_ABBREV; 924 Vals.push_back(Flags); 925 } 926 } 927 break; 928 929 case Instruction::GetElementPtr: 930 Code = bitc::FUNC_CODE_INST_GEP; 931 if (cast<GEPOperator>(&I)->isInBounds()) 932 Code = bitc::FUNC_CODE_INST_INBOUNDS_GEP; 933 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 934 PushValueAndType(I.getOperand(i), InstID, Vals, VE); 935 break; 936 case Instruction::ExtractValue: { 937 Code = bitc::FUNC_CODE_INST_EXTRACTVAL; 938 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 939 const ExtractValueInst *EVI = cast<ExtractValueInst>(&I); 940 for (const unsigned *i = EVI->idx_begin(), *e = EVI->idx_end(); i != e; ++i) 941 Vals.push_back(*i); 942 break; 943 } 944 case Instruction::InsertValue: { 945 Code = bitc::FUNC_CODE_INST_INSERTVAL; 946 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 947 PushValueAndType(I.getOperand(1), InstID, Vals, VE); 948 const InsertValueInst *IVI = cast<InsertValueInst>(&I); 949 for (const unsigned *i = IVI->idx_begin(), *e = IVI->idx_end(); i != e; ++i) 950 Vals.push_back(*i); 951 break; 952 } 953 case Instruction::Select: 954 Code = bitc::FUNC_CODE_INST_VSELECT; 955 PushValueAndType(I.getOperand(1), InstID, Vals, VE); 956 Vals.push_back(VE.getValueID(I.getOperand(2))); 957 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 958 break; 959 case Instruction::ExtractElement: 960 Code = bitc::FUNC_CODE_INST_EXTRACTELT; 961 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 962 Vals.push_back(VE.getValueID(I.getOperand(1))); 963 break; 964 case Instruction::InsertElement: 965 Code = bitc::FUNC_CODE_INST_INSERTELT; 966 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 967 Vals.push_back(VE.getValueID(I.getOperand(1))); 968 Vals.push_back(VE.getValueID(I.getOperand(2))); 969 break; 970 case Instruction::ShuffleVector: 971 Code = bitc::FUNC_CODE_INST_SHUFFLEVEC; 972 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 973 Vals.push_back(VE.getValueID(I.getOperand(1))); 974 Vals.push_back(VE.getValueID(I.getOperand(2))); 975 break; 976 case Instruction::ICmp: 977 case Instruction::FCmp: 978 // compare returning Int1Ty or vector of Int1Ty 979 Code = bitc::FUNC_CODE_INST_CMP2; 980 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 981 Vals.push_back(VE.getValueID(I.getOperand(1))); 982 Vals.push_back(cast<CmpInst>(I).getPredicate()); 983 break; 984 985 case Instruction::Ret: 986 { 987 Code = bitc::FUNC_CODE_INST_RET; 988 unsigned NumOperands = I.getNumOperands(); 989 if (NumOperands == 0) 990 AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV; 991 else if (NumOperands == 1) { 992 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 993 AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV; 994 } else { 995 for (unsigned i = 0, e = NumOperands; i != e; ++i) 996 PushValueAndType(I.getOperand(i), InstID, Vals, VE); 997 } 998 } 999 break; 1000 case Instruction::Br: 1001 { 1002 Code = bitc::FUNC_CODE_INST_BR; 1003 BranchInst &II(cast<BranchInst>(I)); 1004 Vals.push_back(VE.getValueID(II.getSuccessor(0))); 1005 if (II.isConditional()) { 1006 Vals.push_back(VE.getValueID(II.getSuccessor(1))); 1007 Vals.push_back(VE.getValueID(II.getCondition())); 1008 } 1009 } 1010 break; 1011 case Instruction::Switch: 1012 Code = bitc::FUNC_CODE_INST_SWITCH; 1013 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 1014 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 1015 Vals.push_back(VE.getValueID(I.getOperand(i))); 1016 break; 1017 case Instruction::Invoke: { 1018 const InvokeInst *II = cast<InvokeInst>(&I); 1019 const Value *Callee(II->getCalledValue()); 1020 const PointerType *PTy = cast<PointerType>(Callee->getType()); 1021 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 1022 Code = bitc::FUNC_CODE_INST_INVOKE; 1023 1024 Vals.push_back(VE.getAttributeID(II->getAttributes())); 1025 Vals.push_back(II->getCallingConv()); 1026 Vals.push_back(VE.getValueID(II->getNormalDest())); 1027 Vals.push_back(VE.getValueID(II->getUnwindDest())); 1028 PushValueAndType(Callee, InstID, Vals, VE); 1029 1030 // Emit value #'s for the fixed parameters. 1031 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) 1032 Vals.push_back(VE.getValueID(I.getOperand(i+3))); // fixed param. 1033 1034 // Emit type/value pairs for varargs params. 1035 if (FTy->isVarArg()) { 1036 for (unsigned i = 3+FTy->getNumParams(), e = I.getNumOperands(); 1037 i != e; ++i) 1038 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // vararg 1039 } 1040 break; 1041 } 1042 case Instruction::Unwind: 1043 Code = bitc::FUNC_CODE_INST_UNWIND; 1044 break; 1045 case Instruction::Unreachable: 1046 Code = bitc::FUNC_CODE_INST_UNREACHABLE; 1047 AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV; 1048 break; 1049 1050 case Instruction::PHI: 1051 Code = bitc::FUNC_CODE_INST_PHI; 1052 Vals.push_back(VE.getTypeID(I.getType())); 1053 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 1054 Vals.push_back(VE.getValueID(I.getOperand(i))); 1055 break; 1056 1057 case Instruction::Free: 1058 Code = bitc::FUNC_CODE_INST_FREE; 1059 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1060 break; 1061 1062 case Instruction::Alloca: 1063 Code = bitc::FUNC_CODE_INST_ALLOCA; 1064 Vals.push_back(VE.getTypeID(I.getType())); 1065 Vals.push_back(VE.getValueID(I.getOperand(0))); // size. 1066 Vals.push_back(Log2_32(cast<AllocaInst>(I).getAlignment())+1); 1067 break; 1068 1069 case Instruction::Load: 1070 Code = bitc::FUNC_CODE_INST_LOAD; 1071 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) // ptr 1072 AbbrevToUse = FUNCTION_INST_LOAD_ABBREV; 1073 1074 Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1); 1075 Vals.push_back(cast<LoadInst>(I).isVolatile()); 1076 break; 1077 case Instruction::Store: 1078 Code = bitc::FUNC_CODE_INST_STORE2; 1079 PushValueAndType(I.getOperand(1), InstID, Vals, VE); // ptrty + ptr 1080 Vals.push_back(VE.getValueID(I.getOperand(0))); // val. 1081 Vals.push_back(Log2_32(cast<StoreInst>(I).getAlignment())+1); 1082 Vals.push_back(cast<StoreInst>(I).isVolatile()); 1083 break; 1084 case Instruction::Call: { 1085 const PointerType *PTy = cast<PointerType>(I.getOperand(0)->getType()); 1086 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 1087 1088 Code = bitc::FUNC_CODE_INST_CALL; 1089 1090 const CallInst *CI = cast<CallInst>(&I); 1091 Vals.push_back(VE.getAttributeID(CI->getAttributes())); 1092 Vals.push_back((CI->getCallingConv() << 1) | unsigned(CI->isTailCall())); 1093 PushValueAndType(CI->getOperand(0), InstID, Vals, VE); // Callee 1094 1095 // Emit value #'s for the fixed parameters. 1096 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) 1097 Vals.push_back(VE.getValueID(I.getOperand(i+1))); // fixed param. 1098 1099 // Emit type/value pairs for varargs params. 1100 if (FTy->isVarArg()) { 1101 unsigned NumVarargs = I.getNumOperands()-1-FTy->getNumParams(); 1102 for (unsigned i = I.getNumOperands()-NumVarargs, e = I.getNumOperands(); 1103 i != e; ++i) 1104 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // varargs 1105 } 1106 break; 1107 } 1108 case Instruction::VAArg: 1109 Code = bitc::FUNC_CODE_INST_VAARG; 1110 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); // valistty 1111 Vals.push_back(VE.getValueID(I.getOperand(0))); // valist. 1112 Vals.push_back(VE.getTypeID(I.getType())); // restype. 1113 break; 1114 } 1115 1116 Stream.EmitRecord(Code, Vals, AbbrevToUse); 1117 Vals.clear(); 1118} 1119 1120// Emit names for globals/functions etc. 1121static void WriteValueSymbolTable(const ValueSymbolTable &VST, 1122 const ValueEnumerator &VE, 1123 BitstreamWriter &Stream) { 1124 if (VST.empty()) return; 1125 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4); 1126 1127 // FIXME: Set up the abbrev, we know how many values there are! 1128 // FIXME: We know if the type names can use 7-bit ascii. 1129 SmallVector<unsigned, 64> NameVals; 1130 1131 for (ValueSymbolTable::const_iterator SI = VST.begin(), SE = VST.end(); 1132 SI != SE; ++SI) { 1133 1134 const ValueName &Name = *SI; 1135 1136 // Figure out the encoding to use for the name. 1137 bool is7Bit = true; 1138 bool isChar6 = true; 1139 for (const char *C = Name.getKeyData(), *E = C+Name.getKeyLength(); 1140 C != E; ++C) { 1141 if (isChar6) 1142 isChar6 = BitCodeAbbrevOp::isChar6(*C); 1143 if ((unsigned char)*C & 128) { 1144 is7Bit = false; 1145 break; // don't bother scanning the rest. 1146 } 1147 } 1148 1149 unsigned AbbrevToUse = VST_ENTRY_8_ABBREV; 1150 1151 // VST_ENTRY: [valueid, namechar x N] 1152 // VST_BBENTRY: [bbid, namechar x N] 1153 unsigned Code; 1154 if (isa<BasicBlock>(SI->getValue())) { 1155 Code = bitc::VST_CODE_BBENTRY; 1156 if (isChar6) 1157 AbbrevToUse = VST_BBENTRY_6_ABBREV; 1158 } else { 1159 Code = bitc::VST_CODE_ENTRY; 1160 if (isChar6) 1161 AbbrevToUse = VST_ENTRY_6_ABBREV; 1162 else if (is7Bit) 1163 AbbrevToUse = VST_ENTRY_7_ABBREV; 1164 } 1165 1166 NameVals.push_back(VE.getValueID(SI->getValue())); 1167 for (const char *P = Name.getKeyData(), 1168 *E = Name.getKeyData()+Name.getKeyLength(); P != E; ++P) 1169 NameVals.push_back((unsigned char)*P); 1170 1171 // Emit the finished record. 1172 Stream.EmitRecord(Code, NameVals, AbbrevToUse); 1173 NameVals.clear(); 1174 } 1175 Stream.ExitBlock(); 1176} 1177 1178/// WriteFunction - Emit a function body to the module stream. 1179static void WriteFunction(const Function &F, ValueEnumerator &VE, 1180 BitstreamWriter &Stream) { 1181 Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4); 1182 VE.incorporateFunction(F); 1183 1184 SmallVector<unsigned, 64> Vals; 1185 1186 // Emit the number of basic blocks, so the reader can create them ahead of 1187 // time. 1188 Vals.push_back(VE.getBasicBlocks().size()); 1189 Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals); 1190 Vals.clear(); 1191 1192 // If there are function-local constants, emit them now. 1193 unsigned CstStart, CstEnd; 1194 VE.getFunctionConstantRange(CstStart, CstEnd); 1195 WriteConstants(CstStart, CstEnd, VE, Stream, false); 1196 1197 // Keep a running idea of what the instruction ID is. 1198 unsigned InstID = CstEnd; 1199 1200 // Finally, emit all the instructions, in order. 1201 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) 1202 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); 1203 I != E; ++I) { 1204 WriteInstruction(*I, InstID, VE, Stream, Vals); 1205 if (I->getType() != Type::getVoidTy(F.getContext())) 1206 ++InstID; 1207 } 1208 1209 // Emit names for all the instructions etc. 1210 WriteValueSymbolTable(F.getValueSymbolTable(), VE, Stream); 1211 1212 WriteMetadataAttachment(F, VE, Stream); 1213 VE.purgeFunction(); 1214 Stream.ExitBlock(); 1215} 1216 1217/// WriteTypeSymbolTable - Emit a block for the specified type symtab. 1218static void WriteTypeSymbolTable(const TypeSymbolTable &TST, 1219 const ValueEnumerator &VE, 1220 BitstreamWriter &Stream) { 1221 if (TST.empty()) return; 1222 1223 Stream.EnterSubblock(bitc::TYPE_SYMTAB_BLOCK_ID, 3); 1224 1225 // 7-bit fixed width VST_CODE_ENTRY strings. 1226 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1227 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 1228 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1229 Log2_32_Ceil(VE.getTypes().size()+1))); 1230 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1231 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 1232 unsigned V7Abbrev = Stream.EmitAbbrev(Abbv); 1233 1234 SmallVector<unsigned, 64> NameVals; 1235 1236 for (TypeSymbolTable::const_iterator TI = TST.begin(), TE = TST.end(); 1237 TI != TE; ++TI) { 1238 // TST_ENTRY: [typeid, namechar x N] 1239 NameVals.push_back(VE.getTypeID(TI->second)); 1240 1241 const std::string &Str = TI->first; 1242 bool is7Bit = true; 1243 for (unsigned i = 0, e = Str.size(); i != e; ++i) { 1244 NameVals.push_back((unsigned char)Str[i]); 1245 if (Str[i] & 128) 1246 is7Bit = false; 1247 } 1248 1249 // Emit the finished record. 1250 Stream.EmitRecord(bitc::VST_CODE_ENTRY, NameVals, is7Bit ? V7Abbrev : 0); 1251 NameVals.clear(); 1252 } 1253 1254 Stream.ExitBlock(); 1255} 1256 1257// Emit blockinfo, which defines the standard abbreviations etc. 1258static void WriteBlockInfo(const ValueEnumerator &VE, BitstreamWriter &Stream) { 1259 // We only want to emit block info records for blocks that have multiple 1260 // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK. Other 1261 // blocks can defined their abbrevs inline. 1262 Stream.EnterBlockInfoBlock(2); 1263 1264 { // 8-bit fixed-width VST_ENTRY/VST_BBENTRY strings. 1265 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1266 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); 1267 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1268 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1269 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 1270 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1271 Abbv) != VST_ENTRY_8_ABBREV) 1272 llvm_unreachable("Unexpected abbrev ordering!"); 1273 } 1274 1275 { // 7-bit fixed width VST_ENTRY strings. 1276 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1277 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 1278 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1279 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1280 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 1281 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1282 Abbv) != VST_ENTRY_7_ABBREV) 1283 llvm_unreachable("Unexpected abbrev ordering!"); 1284 } 1285 { // 6-bit char6 VST_ENTRY strings. 1286 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1287 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 1288 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1289 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1290 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 1291 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1292 Abbv) != VST_ENTRY_6_ABBREV) 1293 llvm_unreachable("Unexpected abbrev ordering!"); 1294 } 1295 { // 6-bit char6 VST_BBENTRY strings. 1296 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1297 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY)); 1298 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1299 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1300 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 1301 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1302 Abbv) != VST_BBENTRY_6_ABBREV) 1303 llvm_unreachable("Unexpected abbrev ordering!"); 1304 } 1305 1306 1307 1308 { // SETTYPE abbrev for CONSTANTS_BLOCK. 1309 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1310 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE)); 1311 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1312 Log2_32_Ceil(VE.getTypes().size()+1))); 1313 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1314 Abbv) != CONSTANTS_SETTYPE_ABBREV) 1315 llvm_unreachable("Unexpected abbrev ordering!"); 1316 } 1317 1318 { // INTEGER abbrev for CONSTANTS_BLOCK. 1319 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1320 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER)); 1321 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1322 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1323 Abbv) != CONSTANTS_INTEGER_ABBREV) 1324 llvm_unreachable("Unexpected abbrev ordering!"); 1325 } 1326 1327 { // CE_CAST abbrev for CONSTANTS_BLOCK. 1328 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1329 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST)); 1330 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // cast opc 1331 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid 1332 Log2_32_Ceil(VE.getTypes().size()+1))); 1333 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id 1334 1335 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1336 Abbv) != CONSTANTS_CE_CAST_Abbrev) 1337 llvm_unreachable("Unexpected abbrev ordering!"); 1338 } 1339 { // NULL abbrev for CONSTANTS_BLOCK. 1340 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1341 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL)); 1342 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1343 Abbv) != CONSTANTS_NULL_Abbrev) 1344 llvm_unreachable("Unexpected abbrev ordering!"); 1345 } 1346 1347 // FIXME: This should only use space for first class types! 1348 1349 { // INST_LOAD abbrev for FUNCTION_BLOCK. 1350 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1351 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD)); 1352 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr 1353 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align 1354 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile 1355 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1356 Abbv) != FUNCTION_INST_LOAD_ABBREV) 1357 llvm_unreachable("Unexpected abbrev ordering!"); 1358 } 1359 { // INST_BINOP abbrev for FUNCTION_BLOCK. 1360 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1361 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP)); 1362 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS 1363 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS 1364 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1365 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1366 Abbv) != FUNCTION_INST_BINOP_ABBREV) 1367 llvm_unreachable("Unexpected abbrev ordering!"); 1368 } 1369 { // INST_BINOP_FLAGS abbrev for FUNCTION_BLOCK. 1370 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1371 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP)); 1372 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS 1373 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS 1374 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1375 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); // flags 1376 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1377 Abbv) != FUNCTION_INST_BINOP_FLAGS_ABBREV) 1378 llvm_unreachable("Unexpected abbrev ordering!"); 1379 } 1380 { // INST_CAST abbrev for FUNCTION_BLOCK. 1381 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1382 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST)); 1383 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // OpVal 1384 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty 1385 Log2_32_Ceil(VE.getTypes().size()+1))); 1386 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1387 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1388 Abbv) != FUNCTION_INST_CAST_ABBREV) 1389 llvm_unreachable("Unexpected abbrev ordering!"); 1390 } 1391 1392 { // INST_RET abbrev for FUNCTION_BLOCK. 1393 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1394 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET)); 1395 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1396 Abbv) != FUNCTION_INST_RET_VOID_ABBREV) 1397 llvm_unreachable("Unexpected abbrev ordering!"); 1398 } 1399 { // INST_RET abbrev for FUNCTION_BLOCK. 1400 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1401 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET)); 1402 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID 1403 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1404 Abbv) != FUNCTION_INST_RET_VAL_ABBREV) 1405 llvm_unreachable("Unexpected abbrev ordering!"); 1406 } 1407 { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK. 1408 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1409 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE)); 1410 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1411 Abbv) != FUNCTION_INST_UNREACHABLE_ABBREV) 1412 llvm_unreachable("Unexpected abbrev ordering!"); 1413 } 1414 1415 Stream.ExitBlock(); 1416} 1417 1418 1419/// WriteModule - Emit the specified module to the bitstream. 1420static void WriteModule(const Module *M, BitstreamWriter &Stream) { 1421 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3); 1422 1423 // Emit the version number if it is non-zero. 1424 if (CurVersion) { 1425 SmallVector<unsigned, 1> Vals; 1426 Vals.push_back(CurVersion); 1427 Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals); 1428 } 1429 1430 // Analyze the module, enumerating globals, functions, etc. 1431 ValueEnumerator VE(M); 1432 1433 // Emit blockinfo, which defines the standard abbreviations etc. 1434 WriteBlockInfo(VE, Stream); 1435 1436 // Emit information about parameter attributes. 1437 WriteAttributeTable(VE, Stream); 1438 1439 // Emit information describing all of the types in the module. 1440 WriteTypeTable(VE, Stream); 1441 1442 // Emit top-level description of module, including target triple, inline asm, 1443 // descriptors for global variables, and function prototype info. 1444 WriteModuleInfo(M, VE, Stream); 1445 1446 // Emit constants. 1447 WriteModuleConstants(VE, Stream); 1448 1449 // Emit metadata. 1450 WriteModuleMetadata(VE, Stream); 1451 1452 // Emit function bodies. 1453 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) 1454 if (!I->isDeclaration()) 1455 WriteFunction(*I, VE, Stream); 1456 1457 // Emit metadata. 1458 WriteModuleMetadataStore(M, VE, Stream); 1459 1460 // Emit the type symbol table information. 1461 WriteTypeSymbolTable(M->getTypeSymbolTable(), VE, Stream); 1462 1463 // Emit names for globals/functions etc. 1464 WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream); 1465 1466 Stream.ExitBlock(); 1467} 1468 1469/// EmitDarwinBCHeader - If generating a bc file on darwin, we have to emit a 1470/// header and trailer to make it compatible with the system archiver. To do 1471/// this we emit the following header, and then emit a trailer that pads the 1472/// file out to be a multiple of 16 bytes. 1473/// 1474/// struct bc_header { 1475/// uint32_t Magic; // 0x0B17C0DE 1476/// uint32_t Version; // Version, currently always 0. 1477/// uint32_t BitcodeOffset; // Offset to traditional bitcode file. 1478/// uint32_t BitcodeSize; // Size of traditional bitcode file. 1479/// uint32_t CPUType; // CPU specifier. 1480/// ... potentially more later ... 1481/// }; 1482enum { 1483 DarwinBCSizeFieldOffset = 3*4, // Offset to bitcode_size. 1484 DarwinBCHeaderSize = 5*4 1485}; 1486 1487static void EmitDarwinBCHeader(BitstreamWriter &Stream, 1488 const std::string &TT) { 1489 unsigned CPUType = ~0U; 1490 1491 // Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*. The CPUType is a 1492 // magic number from /usr/include/mach/machine.h. It is ok to reproduce the 1493 // specific constants here because they are implicitly part of the Darwin ABI. 1494 enum { 1495 DARWIN_CPU_ARCH_ABI64 = 0x01000000, 1496 DARWIN_CPU_TYPE_X86 = 7, 1497 DARWIN_CPU_TYPE_POWERPC = 18 1498 }; 1499 1500 if (TT.find("x86_64-") == 0) 1501 CPUType = DARWIN_CPU_TYPE_X86 | DARWIN_CPU_ARCH_ABI64; 1502 else if (TT.size() >= 5 && TT[0] == 'i' && TT[2] == '8' && TT[3] == '6' && 1503 TT[4] == '-' && TT[1] - '3' < 6) 1504 CPUType = DARWIN_CPU_TYPE_X86; 1505 else if (TT.find("powerpc-") == 0) 1506 CPUType = DARWIN_CPU_TYPE_POWERPC; 1507 else if (TT.find("powerpc64-") == 0) 1508 CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64; 1509 1510 // Traditional Bitcode starts after header. 1511 unsigned BCOffset = DarwinBCHeaderSize; 1512 1513 Stream.Emit(0x0B17C0DE, 32); 1514 Stream.Emit(0 , 32); // Version. 1515 Stream.Emit(BCOffset , 32); 1516 Stream.Emit(0 , 32); // Filled in later. 1517 Stream.Emit(CPUType , 32); 1518} 1519 1520/// EmitDarwinBCTrailer - Emit the darwin epilog after the bitcode file and 1521/// finalize the header. 1522static void EmitDarwinBCTrailer(BitstreamWriter &Stream, unsigned BufferSize) { 1523 // Update the size field in the header. 1524 Stream.BackpatchWord(DarwinBCSizeFieldOffset, BufferSize-DarwinBCHeaderSize); 1525 1526 // If the file is not a multiple of 16 bytes, insert dummy padding. 1527 while (BufferSize & 15) { 1528 Stream.Emit(0, 8); 1529 ++BufferSize; 1530 } 1531} 1532 1533 1534/// WriteBitcodeToFile - Write the specified module to the specified output 1535/// stream. 1536void llvm::WriteBitcodeToFile(const Module *M, raw_ostream &Out) { 1537 std::vector<unsigned char> Buffer; 1538 BitstreamWriter Stream(Buffer); 1539 1540 Buffer.reserve(256*1024); 1541 1542 WriteBitcodeToStream( M, Stream ); 1543 1544 // If writing to stdout, set binary mode. 1545 if (&llvm::outs() == &Out) 1546 sys::Program::ChangeStdoutToBinary(); 1547 1548 // Write the generated bitstream to "Out". 1549 Out.write((char*)&Buffer.front(), Buffer.size()); 1550 1551 // Make sure it hits disk now. 1552 Out.flush(); 1553} 1554 1555/// WriteBitcodeToStream - Write the specified module to the specified output 1556/// stream. 1557void llvm::WriteBitcodeToStream(const Module *M, BitstreamWriter &Stream) { 1558 // If this is darwin, emit a file header and trailer if needed. 1559 bool isDarwin = M->getTargetTriple().find("-darwin") != std::string::npos; 1560 if (isDarwin) 1561 EmitDarwinBCHeader(Stream, M->getTargetTriple()); 1562 1563 // Emit the file header. 1564 Stream.Emit((unsigned)'B', 8); 1565 Stream.Emit((unsigned)'C', 8); 1566 Stream.Emit(0x0, 4); 1567 Stream.Emit(0xC, 4); 1568 Stream.Emit(0xE, 4); 1569 Stream.Emit(0xD, 4); 1570 1571 // Emit the module. 1572 WriteModule(M, Stream); 1573 1574 if (isDarwin) 1575 EmitDarwinBCTrailer(Stream, Stream.getBuffer().size()); 1576} 1577