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 "ReaderWriter_2_9.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/ValueSymbolTable.h" 25 #include "llvm/ADT/Triple.h" 26 #include "llvm/Support/ErrorHandling.h" 27 #include "llvm/Support/MathExtras.h" 28 #include "llvm/Support/raw_ostream.h" 29 #include "llvm/Support/Program.h" 30 #include <cctype> 31 #include <map> 32 using namespace llvm; 33 34 // Redefine older bitcode opcodes for use here. Note that these come from 35 // LLVM 2.7 (which is what HC shipped with). 36 #define METADATA_NODE_2_7 2 37 #define METADATA_FN_NODE_2_7 3 38 #define METADATA_NAMED_NODE_2_7 5 39 #define METADATA_ATTACHMENT_2_7 7 40 #define FUNC_CODE_INST_CALL_2_7 22 41 #define FUNC_CODE_DEBUG_LOC_2_7 32 42 43 // Redefine older bitcode opcodes for use here. Note that these come from 44 // LLVM 2.7 - 3.0. 45 #define TYPE_BLOCK_ID_OLD_3_0 10 46 #define TYPE_SYMTAB_BLOCK_ID_OLD_3_0 13 47 #define TYPE_CODE_STRUCT_OLD_3_0 10 48 49 /// These are manifest constants used by the bitcode writer. They do not need to 50 /// be kept in sync with the reader, but need to be consistent within this file. 51 enum { 52 CurVersion = 0, 53 54 // VALUE_SYMTAB_BLOCK abbrev id's. 55 VST_ENTRY_8_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 56 VST_ENTRY_7_ABBREV, 57 VST_ENTRY_6_ABBREV, 58 VST_BBENTRY_6_ABBREV, 59 60 // CONSTANTS_BLOCK abbrev id's. 61 CONSTANTS_SETTYPE_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 62 CONSTANTS_INTEGER_ABBREV, 63 CONSTANTS_CE_CAST_Abbrev, 64 CONSTANTS_NULL_Abbrev, 65 66 // FUNCTION_BLOCK abbrev id's. 67 FUNCTION_INST_LOAD_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 68 FUNCTION_INST_BINOP_ABBREV, 69 FUNCTION_INST_BINOP_FLAGS_ABBREV, 70 FUNCTION_INST_CAST_ABBREV, 71 FUNCTION_INST_RET_VOID_ABBREV, 72 FUNCTION_INST_RET_VAL_ABBREV, 73 FUNCTION_INST_UNREACHABLE_ABBREV 74 }; 75 76 77 static unsigned GetEncodedCastOpcode(unsigned Opcode) { 78 switch (Opcode) { 79 default: llvm_unreachable("Unknown cast instruction!"); 80 case Instruction::Trunc : return bitc::CAST_TRUNC; 81 case Instruction::ZExt : return bitc::CAST_ZEXT; 82 case Instruction::SExt : return bitc::CAST_SEXT; 83 case Instruction::FPToUI : return bitc::CAST_FPTOUI; 84 case Instruction::FPToSI : return bitc::CAST_FPTOSI; 85 case Instruction::UIToFP : return bitc::CAST_UITOFP; 86 case Instruction::SIToFP : return bitc::CAST_SITOFP; 87 case Instruction::FPTrunc : return bitc::CAST_FPTRUNC; 88 case Instruction::FPExt : return bitc::CAST_FPEXT; 89 case Instruction::PtrToInt: return bitc::CAST_PTRTOINT; 90 case Instruction::IntToPtr: return bitc::CAST_INTTOPTR; 91 case Instruction::BitCast : return bitc::CAST_BITCAST; 92 } 93 } 94 95 static unsigned GetEncodedBinaryOpcode(unsigned Opcode) { 96 switch (Opcode) { 97 default: llvm_unreachable("Unknown binary instruction!"); 98 case Instruction::Add: 99 case Instruction::FAdd: return bitc::BINOP_ADD; 100 case Instruction::Sub: 101 case Instruction::FSub: return bitc::BINOP_SUB; 102 case Instruction::Mul: 103 case Instruction::FMul: return bitc::BINOP_MUL; 104 case Instruction::UDiv: return bitc::BINOP_UDIV; 105 case Instruction::FDiv: 106 case Instruction::SDiv: return bitc::BINOP_SDIV; 107 case Instruction::URem: return bitc::BINOP_UREM; 108 case Instruction::FRem: 109 case Instruction::SRem: return bitc::BINOP_SREM; 110 case Instruction::Shl: return bitc::BINOP_SHL; 111 case Instruction::LShr: return bitc::BINOP_LSHR; 112 case Instruction::AShr: return bitc::BINOP_ASHR; 113 case Instruction::And: return bitc::BINOP_AND; 114 case Instruction::Or: return bitc::BINOP_OR; 115 case Instruction::Xor: return bitc::BINOP_XOR; 116 } 117 } 118 119 static void WriteStringRecord(unsigned Code, StringRef Str, 120 unsigned AbbrevToUse, BitstreamWriter &Stream) { 121 SmallVector<unsigned, 64> Vals; 122 123 // Code: [strchar x N] 124 for (unsigned i = 0, e = Str.size(); i != e; ++i) { 125 if (AbbrevToUse && !BitCodeAbbrevOp::isChar6(Str[i])) 126 AbbrevToUse = 0; 127 Vals.push_back(Str[i]); 128 } 129 130 // Emit the finished record. 131 Stream.EmitRecord(Code, Vals, AbbrevToUse); 132 } 133 134 // Emit information about parameter attributes. 135 static void WriteAttributeTable(const llvm_2_9::ValueEnumerator &VE, 136 BitstreamWriter &Stream) { 137 const std::vector<AttrListPtr> &Attrs = VE.getAttributes(); 138 if (Attrs.empty()) return; 139 140 Stream.EnterSubblock(bitc::PARAMATTR_BLOCK_ID, 3); 141 142 SmallVector<uint64_t, 64> Record; 143 for (unsigned i = 0, e = Attrs.size(); i != e; ++i) { 144 const AttrListPtr &A = Attrs[i]; 145 for (unsigned i = 0, e = A.getNumSlots(); i != e; ++i) { 146 const AttributeWithIndex &PAWI = A.getSlot(i); 147 Record.push_back(PAWI.Index); 148 149 // FIXME: remove in LLVM 3.0 150 // Store the alignment in the bitcode as a 16-bit raw value instead of a 151 // 5-bit log2 encoded value. Shift the bits above the alignment up by 152 // 11 bits. 153 uint64_t FauxAttr = PAWI.Attrs.Raw() & 0xffff; 154 if (PAWI.Attrs & Attribute::Alignment) 155 FauxAttr |= (1ull<<16)<< 156 (((PAWI.Attrs & Attribute::Alignment).Raw()-1) >> 16); 157 FauxAttr |= (PAWI.Attrs.Raw() & (0x3FFull << 21)) << 11; 158 159 Record.push_back(FauxAttr); 160 } 161 162 Stream.EmitRecord(bitc::PARAMATTR_CODE_ENTRY, Record); 163 Record.clear(); 164 } 165 166 Stream.ExitBlock(); 167 } 168 169 static void WriteTypeSymbolTable(const llvm_2_9::ValueEnumerator &VE, 170 BitstreamWriter &Stream) { 171 const llvm_2_9::ValueEnumerator::TypeList &TypeList = VE.getTypes(); 172 Stream.EnterSubblock(TYPE_SYMTAB_BLOCK_ID_OLD_3_0, 3); 173 174 // 7-bit fixed width VST_CODE_ENTRY strings. 175 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 176 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 177 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 178 Log2_32_Ceil(VE.getTypes().size()+1))); 179 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 180 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 181 unsigned V7Abbrev = Stream.EmitAbbrev(Abbv); 182 183 SmallVector<unsigned, 64> NameVals; 184 185 for (unsigned i = 0, e = TypeList.size(); i != e; ++i) { 186 Type *T = TypeList[i]; 187 188 switch (T->getTypeID()) { 189 case Type::StructTyID: { 190 StructType *ST = cast<StructType>(T); 191 if (ST->isLiteral()) { 192 // Skip anonymous struct definitions in type symbol table 193 // FIXME(srhines) 194 break; 195 } 196 197 // TST_ENTRY: [typeid, namechar x N] 198 NameVals.push_back(i); 199 200 const std::string &Str = ST->getName(); 201 bool is7Bit = true; 202 for (unsigned i = 0, e = Str.size(); i != e; ++i) { 203 NameVals.push_back((unsigned char)Str[i]); 204 if (Str[i] & 128) 205 is7Bit = false; 206 } 207 208 // Emit the finished record. 209 Stream.EmitRecord(bitc::VST_CODE_ENTRY, NameVals, is7Bit ? V7Abbrev : 0); 210 NameVals.clear(); 211 212 break; 213 } 214 default: break; 215 } 216 } 217 218 #if 0 219 for (TypeSymbolTable::const_iterator TI = TST.begin(), TE = TST.end(); 220 TI != TE; ++TI) { 221 // TST_ENTRY: [typeid, namechar x N] 222 NameVals.push_back(VE.getTypeID(TI->second)); 223 224 const std::string &Str = TI->first; 225 bool is7Bit = true; 226 for (unsigned i = 0, e = Str.size(); i != e; ++i) { 227 NameVals.push_back((unsigned char)Str[i]); 228 if (Str[i] & 128) 229 is7Bit = false; 230 } 231 232 // Emit the finished record. 233 Stream.EmitRecord(bitc::VST_CODE_ENTRY, NameVals, is7Bit ? V7Abbrev : 0); 234 NameVals.clear(); 235 } 236 #endif 237 238 Stream.ExitBlock(); 239 } 240 241 /// WriteTypeTable - Write out the type table for a module. 242 static void WriteTypeTable(const llvm_2_9::ValueEnumerator &VE, 243 BitstreamWriter &Stream) { 244 const llvm_2_9::ValueEnumerator::TypeList &TypeList = VE.getTypes(); 245 246 Stream.EnterSubblock(TYPE_BLOCK_ID_OLD_3_0, 4 /*count from # abbrevs */); 247 SmallVector<uint64_t, 64> TypeVals; 248 249 // Abbrev for TYPE_CODE_POINTER. 250 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 251 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_POINTER)); 252 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 253 Log2_32_Ceil(VE.getTypes().size()+1))); 254 Abbv->Add(BitCodeAbbrevOp(0)); // Addrspace = 0 255 unsigned PtrAbbrev = Stream.EmitAbbrev(Abbv); 256 257 // Abbrev for TYPE_CODE_FUNCTION. 258 Abbv = new BitCodeAbbrev(); 259 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_FUNCTION_OLD)); 260 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isvararg 261 Abbv->Add(BitCodeAbbrevOp(0)); // FIXME: DEAD value, remove in LLVM 3.0 262 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 263 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 264 Log2_32_Ceil(VE.getTypes().size()+1))); 265 unsigned FunctionAbbrev = Stream.EmitAbbrev(Abbv); 266 267 #if 0 268 // Abbrev for TYPE_CODE_STRUCT_ANON. 269 Abbv = new BitCodeAbbrev(); 270 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_ANON)); 271 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked 272 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 273 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 274 Log2_32_Ceil(VE.getTypes().size()+1))); 275 unsigned StructAnonAbbrev = Stream.EmitAbbrev(Abbv); 276 277 // Abbrev for TYPE_CODE_STRUCT_NAME. 278 Abbv = new BitCodeAbbrev(); 279 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAME)); 280 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 281 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 282 unsigned StructNameAbbrev = Stream.EmitAbbrev(Abbv); 283 284 // Abbrev for TYPE_CODE_STRUCT_NAMED. 285 Abbv = new BitCodeAbbrev(); 286 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAMED)); 287 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked 288 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 289 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 290 Log2_32_Ceil(VE.getTypes().size()+1))); 291 unsigned StructNamedAbbrev = Stream.EmitAbbrev(Abbv); 292 #endif 293 294 // Abbrev for TYPE_CODE_STRUCT. 295 Abbv = new BitCodeAbbrev(); 296 Abbv->Add(BitCodeAbbrevOp(TYPE_CODE_STRUCT_OLD_3_0)); 297 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked 298 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 299 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 300 Log2_32_Ceil(VE.getTypes().size()+1))); 301 unsigned StructAbbrev = Stream.EmitAbbrev(Abbv); 302 303 // Abbrev for TYPE_CODE_ARRAY. 304 Abbv = new BitCodeAbbrev(); 305 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_ARRAY)); 306 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // size 307 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 308 Log2_32_Ceil(VE.getTypes().size()+1))); 309 unsigned ArrayAbbrev = Stream.EmitAbbrev(Abbv); 310 311 // Emit an entry count so the reader can reserve space. 312 TypeVals.push_back(TypeList.size()); 313 Stream.EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals); 314 TypeVals.clear(); 315 316 // Loop over all of the types, emitting each in turn. 317 for (unsigned i = 0, e = TypeList.size(); i != e; ++i) { 318 Type *T = TypeList[i]; 319 int AbbrevToUse = 0; 320 unsigned Code = 0; 321 322 switch (T->getTypeID()) { 323 default: llvm_unreachable("Unknown type!"); 324 case Type::VoidTyID: Code = bitc::TYPE_CODE_VOID; break; 325 case Type::FloatTyID: Code = bitc::TYPE_CODE_FLOAT; break; 326 case Type::DoubleTyID: Code = bitc::TYPE_CODE_DOUBLE; break; 327 case Type::X86_FP80TyID: Code = bitc::TYPE_CODE_X86_FP80; break; 328 case Type::FP128TyID: Code = bitc::TYPE_CODE_FP128; break; 329 case Type::PPC_FP128TyID: Code = bitc::TYPE_CODE_PPC_FP128; break; 330 case Type::LabelTyID: Code = bitc::TYPE_CODE_LABEL; break; 331 case Type::MetadataTyID: Code = bitc::TYPE_CODE_METADATA; break; 332 case Type::X86_MMXTyID: Code = bitc::TYPE_CODE_X86_MMX; break; 333 case Type::IntegerTyID: 334 // INTEGER: [width] 335 Code = bitc::TYPE_CODE_INTEGER; 336 TypeVals.push_back(cast<IntegerType>(T)->getBitWidth()); 337 break; 338 case Type::PointerTyID: { 339 PointerType *PTy = cast<PointerType>(T); 340 // POINTER: [pointee type, address space] 341 Code = bitc::TYPE_CODE_POINTER; 342 TypeVals.push_back(VE.getTypeID(PTy->getElementType())); 343 unsigned AddressSpace = PTy->getAddressSpace(); 344 TypeVals.push_back(AddressSpace); 345 if (AddressSpace == 0) AbbrevToUse = PtrAbbrev; 346 break; 347 } 348 case Type::FunctionTyID: { 349 FunctionType *FT = cast<FunctionType>(T); 350 // FUNCTION: [isvararg, attrid, retty, paramty x N] 351 Code = bitc::TYPE_CODE_FUNCTION_OLD; 352 TypeVals.push_back(FT->isVarArg()); 353 TypeVals.push_back(0); // FIXME: DEAD: remove in llvm 3.0 354 TypeVals.push_back(VE.getTypeID(FT->getReturnType())); 355 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) 356 TypeVals.push_back(VE.getTypeID(FT->getParamType(i))); 357 AbbrevToUse = FunctionAbbrev; 358 break; 359 } 360 case Type::StructTyID: { 361 StructType *ST = cast<StructType>(T); 362 // STRUCT: [ispacked, eltty x N] 363 TypeVals.push_back(ST->isPacked()); 364 // Output all of the element types. 365 for (StructType::element_iterator I = ST->element_begin(), 366 E = ST->element_end(); I != E; ++I) 367 TypeVals.push_back(VE.getTypeID(*I)); 368 AbbrevToUse = StructAbbrev; 369 break; 370 } 371 case Type::ArrayTyID: { 372 ArrayType *AT = cast<ArrayType>(T); 373 // ARRAY: [numelts, eltty] 374 Code = bitc::TYPE_CODE_ARRAY; 375 TypeVals.push_back(AT->getNumElements()); 376 TypeVals.push_back(VE.getTypeID(AT->getElementType())); 377 AbbrevToUse = ArrayAbbrev; 378 break; 379 } 380 case Type::VectorTyID: { 381 VectorType *VT = cast<VectorType>(T); 382 // VECTOR [numelts, eltty] 383 Code = bitc::TYPE_CODE_VECTOR; 384 TypeVals.push_back(VT->getNumElements()); 385 TypeVals.push_back(VE.getTypeID(VT->getElementType())); 386 break; 387 } 388 } 389 390 // Emit the finished record. 391 Stream.EmitRecord(Code, TypeVals, AbbrevToUse); 392 TypeVals.clear(); 393 } 394 395 Stream.ExitBlock(); 396 397 WriteTypeSymbolTable(VE, Stream); 398 } 399 400 static unsigned getEncodedLinkage(const GlobalValue *GV) { 401 switch (GV->getLinkage()) { 402 case GlobalValue::ExternalLinkage: return 0; 403 case GlobalValue::WeakAnyLinkage: return 1; 404 case GlobalValue::AppendingLinkage: return 2; 405 case GlobalValue::InternalLinkage: return 3; 406 case GlobalValue::LinkOnceAnyLinkage: return 4; 407 case GlobalValue::DLLImportLinkage: return 5; 408 case GlobalValue::DLLExportLinkage: return 6; 409 case GlobalValue::ExternalWeakLinkage: return 7; 410 case GlobalValue::CommonLinkage: return 8; 411 case GlobalValue::PrivateLinkage: return 9; 412 case GlobalValue::WeakODRLinkage: return 10; 413 case GlobalValue::LinkOnceODRLinkage: return 11; 414 case GlobalValue::AvailableExternallyLinkage: return 12; 415 case GlobalValue::LinkerPrivateLinkage: return 13; 416 case GlobalValue::LinkerPrivateWeakLinkage: return 14; 417 case GlobalValue::LinkOnceODRAutoHideLinkage: return 15; 418 } 419 llvm_unreachable("Invalid linkage"); 420 } 421 422 static unsigned getEncodedVisibility(const GlobalValue *GV) { 423 switch (GV->getVisibility()) { 424 default: llvm_unreachable("Invalid visibility!"); 425 case GlobalValue::DefaultVisibility: return 0; 426 case GlobalValue::HiddenVisibility: return 1; 427 case GlobalValue::ProtectedVisibility: return 2; 428 } 429 } 430 431 // Emit top-level description of module, including target triple, inline asm, 432 // descriptors for global variables, and function prototype info. 433 static void WriteModuleInfo(const Module *M, 434 const llvm_2_9::ValueEnumerator &VE, 435 BitstreamWriter &Stream) { 436 // Emit the list of dependent libraries for the Module. 437 for (Module::lib_iterator I = M->lib_begin(), E = M->lib_end(); I != E; ++I) 438 WriteStringRecord(bitc::MODULE_CODE_DEPLIB, *I, 0/*TODO*/, Stream); 439 440 // Emit various pieces of data attached to a module. 441 if (!M->getTargetTriple().empty()) 442 WriteStringRecord(bitc::MODULE_CODE_TRIPLE, M->getTargetTriple(), 443 0/*TODO*/, Stream); 444 if (!M->getDataLayout().empty()) 445 WriteStringRecord(bitc::MODULE_CODE_DATALAYOUT, M->getDataLayout(), 446 0/*TODO*/, Stream); 447 if (!M->getModuleInlineAsm().empty()) 448 WriteStringRecord(bitc::MODULE_CODE_ASM, M->getModuleInlineAsm(), 449 0/*TODO*/, Stream); 450 451 // Emit information about sections and GC, computing how many there are. Also 452 // compute the maximum alignment value. 453 std::map<std::string, unsigned> SectionMap; 454 std::map<std::string, unsigned> GCMap; 455 unsigned MaxAlignment = 0; 456 unsigned MaxGlobalType = 0; 457 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end(); 458 GV != E; ++GV) { 459 MaxAlignment = std::max(MaxAlignment, GV->getAlignment()); 460 MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV->getType())); 461 462 if (!GV->hasSection()) continue; 463 // Give section names unique ID's. 464 unsigned &Entry = SectionMap[GV->getSection()]; 465 if (Entry != 0) continue; 466 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, GV->getSection(), 467 0/*TODO*/, Stream); 468 Entry = SectionMap.size(); 469 } 470 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) { 471 MaxAlignment = std::max(MaxAlignment, F->getAlignment()); 472 if (F->hasSection()) { 473 // Give section names unique ID's. 474 unsigned &Entry = SectionMap[F->getSection()]; 475 if (!Entry) { 476 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, F->getSection(), 477 0/*TODO*/, Stream); 478 Entry = SectionMap.size(); 479 } 480 } 481 if (F->hasGC()) { 482 // Same for GC names. 483 unsigned &Entry = GCMap[F->getGC()]; 484 if (!Entry) { 485 WriteStringRecord(bitc::MODULE_CODE_GCNAME, F->getGC(), 486 0/*TODO*/, Stream); 487 Entry = GCMap.size(); 488 } 489 } 490 } 491 492 // Emit abbrev for globals, now that we know # sections and max alignment. 493 unsigned SimpleGVarAbbrev = 0; 494 if (!M->global_empty()) { 495 // Add an abbrev for common globals with no visibility or thread localness. 496 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 497 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR)); 498 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 499 Log2_32_Ceil(MaxGlobalType+1))); 500 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constant. 501 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer. 502 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // Linkage. 503 if (MaxAlignment == 0) // Alignment. 504 Abbv->Add(BitCodeAbbrevOp(0)); 505 else { 506 unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1; 507 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 508 Log2_32_Ceil(MaxEncAlignment+1))); 509 } 510 if (SectionMap.empty()) // Section. 511 Abbv->Add(BitCodeAbbrevOp(0)); 512 else 513 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 514 Log2_32_Ceil(SectionMap.size()+1))); 515 // Don't bother emitting vis + thread local. 516 SimpleGVarAbbrev = Stream.EmitAbbrev(Abbv); 517 } 518 519 // Emit the global variable information. 520 SmallVector<unsigned, 64> Vals; 521 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end(); 522 GV != E; ++GV) { 523 unsigned AbbrevToUse = 0; 524 525 // GLOBALVAR: [type, isconst, initid, 526 // linkage, alignment, section, visibility, threadlocal, 527 // unnamed_addr] 528 Vals.push_back(VE.getTypeID(GV->getType())); 529 Vals.push_back(GV->isConstant()); 530 Vals.push_back(GV->isDeclaration() ? 0 : 531 (VE.getValueID(GV->getInitializer()) + 1)); 532 Vals.push_back(getEncodedLinkage(GV)); 533 Vals.push_back(Log2_32(GV->getAlignment())+1); 534 Vals.push_back(GV->hasSection() ? SectionMap[GV->getSection()] : 0); 535 if (GV->isThreadLocal() || 536 GV->getVisibility() != GlobalValue::DefaultVisibility || 537 GV->hasUnnamedAddr()) { 538 Vals.push_back(getEncodedVisibility(GV)); 539 Vals.push_back(GV->isThreadLocal()); 540 Vals.push_back(GV->hasUnnamedAddr()); 541 } else { 542 AbbrevToUse = SimpleGVarAbbrev; 543 } 544 545 Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse); 546 Vals.clear(); 547 } 548 549 // Emit the function proto information. 550 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) { 551 // FUNCTION: [type, callingconv, isproto, paramattr, 552 // linkage, alignment, section, visibility, gc, unnamed_addr] 553 Vals.push_back(VE.getTypeID(F->getType())); 554 Vals.push_back(F->getCallingConv()); 555 Vals.push_back(F->isDeclaration()); 556 Vals.push_back(getEncodedLinkage(F)); 557 Vals.push_back(VE.getAttributeID(F->getAttributes())); 558 Vals.push_back(Log2_32(F->getAlignment())+1); 559 Vals.push_back(F->hasSection() ? SectionMap[F->getSection()] : 0); 560 Vals.push_back(getEncodedVisibility(F)); 561 Vals.push_back(F->hasGC() ? GCMap[F->getGC()] : 0); 562 Vals.push_back(F->hasUnnamedAddr()); 563 564 unsigned AbbrevToUse = 0; 565 Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse); 566 Vals.clear(); 567 } 568 569 // Emit the alias information. 570 for (Module::const_alias_iterator AI = M->alias_begin(), E = M->alias_end(); 571 AI != E; ++AI) { 572 Vals.push_back(VE.getTypeID(AI->getType())); 573 Vals.push_back(VE.getValueID(AI->getAliasee())); 574 Vals.push_back(getEncodedLinkage(AI)); 575 Vals.push_back(getEncodedVisibility(AI)); 576 unsigned AbbrevToUse = 0; 577 Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse); 578 Vals.clear(); 579 } 580 } 581 582 static uint64_t GetOptimizationFlags(const Value *V) { 583 uint64_t Flags = 0; 584 585 if (const OverflowingBinaryOperator *OBO = 586 dyn_cast<OverflowingBinaryOperator>(V)) { 587 if (OBO->hasNoSignedWrap()) 588 Flags |= 1 << bitc::OBO_NO_SIGNED_WRAP; 589 if (OBO->hasNoUnsignedWrap()) 590 Flags |= 1 << bitc::OBO_NO_UNSIGNED_WRAP; 591 } else if (const PossiblyExactOperator *PEO = 592 dyn_cast<PossiblyExactOperator>(V)) { 593 if (PEO->isExact()) 594 Flags |= 1 << bitc::PEO_EXACT; 595 } 596 597 return Flags; 598 } 599 600 static void WriteMDNode(const MDNode *N, 601 const llvm_2_9::ValueEnumerator &VE, 602 BitstreamWriter &Stream, 603 SmallVector<uint64_t, 64> &Record) { 604 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) { 605 if (N->getOperand(i)) { 606 Record.push_back(VE.getTypeID(N->getOperand(i)->getType())); 607 Record.push_back(VE.getValueID(N->getOperand(i))); 608 } else { 609 Record.push_back(VE.getTypeID(Type::getVoidTy(N->getContext()))); 610 Record.push_back(0); 611 } 612 } 613 unsigned MDCode = N->isFunctionLocal() ? METADATA_FN_NODE_2_7 : 614 METADATA_NODE_2_7; 615 Stream.EmitRecord(MDCode, Record, 0); 616 Record.clear(); 617 } 618 619 static void WriteModuleMetadata(const Module *M, 620 const llvm_2_9::ValueEnumerator &VE, 621 BitstreamWriter &Stream) { 622 const llvm_2_9::ValueEnumerator::ValueList &Vals = VE.getMDValues(); 623 bool StartedMetadataBlock = false; 624 unsigned MDSAbbrev = 0; 625 SmallVector<uint64_t, 64> Record; 626 for (unsigned i = 0, e = Vals.size(); i != e; ++i) { 627 628 if (const MDNode *N = dyn_cast<MDNode>(Vals[i].first)) { 629 if (!N->isFunctionLocal() || !N->getFunction()) { 630 if (!StartedMetadataBlock) { 631 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 632 StartedMetadataBlock = true; 633 } 634 WriteMDNode(N, VE, Stream, Record); 635 } 636 } else if (const MDString *MDS = dyn_cast<MDString>(Vals[i].first)) { 637 if (!StartedMetadataBlock) { 638 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 639 640 // Abbrev for METADATA_STRING. 641 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 642 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_STRING)); 643 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 644 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 645 MDSAbbrev = Stream.EmitAbbrev(Abbv); 646 StartedMetadataBlock = true; 647 } 648 649 // Code: [strchar x N] 650 Record.append(MDS->begin(), MDS->end()); 651 652 // Emit the finished record. 653 Stream.EmitRecord(bitc::METADATA_STRING, Record, MDSAbbrev); 654 Record.clear(); 655 } 656 } 657 658 // Write named metadata. 659 for (Module::const_named_metadata_iterator I = M->named_metadata_begin(), 660 E = M->named_metadata_end(); I != E; ++I) { 661 const NamedMDNode *NMD = I; 662 if (!StartedMetadataBlock) { 663 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 664 StartedMetadataBlock = true; 665 } 666 667 // Write name. 668 StringRef Str = NMD->getName(); 669 for (unsigned i = 0, e = Str.size(); i != e; ++i) 670 Record.push_back(Str[i]); 671 Stream.EmitRecord(bitc::METADATA_NAME, Record, 0/*TODO*/); 672 Record.clear(); 673 674 // Write named metadata operands. 675 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) 676 Record.push_back(VE.getValueID(NMD->getOperand(i))); 677 Stream.EmitRecord(METADATA_NAMED_NODE_2_7, Record, 0); 678 Record.clear(); 679 } 680 681 if (StartedMetadataBlock) 682 Stream.ExitBlock(); 683 } 684 685 static void WriteFunctionLocalMetadata(const Function &F, 686 const llvm_2_9::ValueEnumerator &VE, 687 BitstreamWriter &Stream) { 688 bool StartedMetadataBlock = false; 689 SmallVector<uint64_t, 64> Record; 690 const SmallVector<const MDNode *, 8> &Vals = VE.getFunctionLocalMDValues(); 691 for (unsigned i = 0, e = Vals.size(); i != e; ++i) 692 if (const MDNode *N = Vals[i]) 693 if (N->isFunctionLocal() && N->getFunction() == &F) { 694 if (!StartedMetadataBlock) { 695 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 696 StartedMetadataBlock = true; 697 } 698 WriteMDNode(N, VE, Stream, Record); 699 } 700 701 if (StartedMetadataBlock) 702 Stream.ExitBlock(); 703 } 704 705 static void WriteMetadataAttachment(const Function &F, 706 const llvm_2_9::ValueEnumerator &VE, 707 BitstreamWriter &Stream) { 708 Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3); 709 710 SmallVector<uint64_t, 64> Record; 711 712 // Write metadata attachments 713 // METADATA_ATTACHMENT - [m x [value, [n x [id, mdnode]]] 714 SmallVector<std::pair<unsigned, MDNode*>, 4> MDs; 715 716 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) 717 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); 718 I != E; ++I) { 719 MDs.clear(); 720 I->getAllMetadataOtherThanDebugLoc(MDs); 721 722 // If no metadata, ignore instruction. 723 if (MDs.empty()) continue; 724 725 Record.push_back(VE.getInstructionID(I)); 726 727 for (unsigned i = 0, e = MDs.size(); i != e; ++i) { 728 Record.push_back(MDs[i].first); 729 Record.push_back(VE.getValueID(MDs[i].second)); 730 } 731 Stream.EmitRecord(METADATA_ATTACHMENT_2_7, Record, 0); 732 Record.clear(); 733 } 734 735 Stream.ExitBlock(); 736 } 737 738 static void WriteModuleMetadataStore(const Module *M, BitstreamWriter &Stream) { 739 SmallVector<uint64_t, 64> Record; 740 741 // Write metadata kinds 742 // METADATA_KIND - [n x [id, name]] 743 SmallVector<StringRef, 4> Names; 744 M->getMDKindNames(Names); 745 746 if (Names.empty()) return; 747 748 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 749 750 for (unsigned MDKindID = 0, e = Names.size(); MDKindID != e; ++MDKindID) { 751 Record.push_back(MDKindID); 752 StringRef KName = Names[MDKindID]; 753 Record.append(KName.begin(), KName.end()); 754 755 Stream.EmitRecord(bitc::METADATA_KIND, Record, 0); 756 Record.clear(); 757 } 758 759 Stream.ExitBlock(); 760 } 761 762 static void WriteConstants(unsigned FirstVal, unsigned LastVal, 763 const llvm_2_9::ValueEnumerator &VE, 764 BitstreamWriter &Stream, bool isGlobal) { 765 if (FirstVal == LastVal) return; 766 767 Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4); 768 769 unsigned AggregateAbbrev = 0; 770 unsigned String8Abbrev = 0; 771 unsigned CString7Abbrev = 0; 772 unsigned CString6Abbrev = 0; 773 // If this is a constant pool for the module, emit module-specific abbrevs. 774 if (isGlobal) { 775 // Abbrev for CST_CODE_AGGREGATE. 776 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 777 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE)); 778 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 779 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1))); 780 AggregateAbbrev = Stream.EmitAbbrev(Abbv); 781 782 // Abbrev for CST_CODE_STRING. 783 Abbv = new BitCodeAbbrev(); 784 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING)); 785 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 786 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 787 String8Abbrev = Stream.EmitAbbrev(Abbv); 788 // Abbrev for CST_CODE_CSTRING. 789 Abbv = new BitCodeAbbrev(); 790 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING)); 791 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 792 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 793 CString7Abbrev = Stream.EmitAbbrev(Abbv); 794 // Abbrev for CST_CODE_CSTRING. 795 Abbv = new BitCodeAbbrev(); 796 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING)); 797 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 798 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 799 CString6Abbrev = Stream.EmitAbbrev(Abbv); 800 } 801 802 SmallVector<uint64_t, 64> Record; 803 804 const llvm_2_9::ValueEnumerator::ValueList &Vals = VE.getValues(); 805 Type *LastTy = 0; 806 for (unsigned i = FirstVal; i != LastVal; ++i) { 807 const Value *V = Vals[i].first; 808 // If we need to switch types, do so now. 809 if (V->getType() != LastTy) { 810 LastTy = V->getType(); 811 Record.push_back(VE.getTypeID(LastTy)); 812 Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record, 813 CONSTANTS_SETTYPE_ABBREV); 814 Record.clear(); 815 } 816 817 if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) { 818 Record.push_back(unsigned(IA->hasSideEffects()) | 819 unsigned(IA->isAlignStack()) << 1); 820 821 // Add the asm string. 822 const std::string &AsmStr = IA->getAsmString(); 823 Record.push_back(AsmStr.size()); 824 for (unsigned i = 0, e = AsmStr.size(); i != e; ++i) 825 Record.push_back(AsmStr[i]); 826 827 // Add the constraint string. 828 const std::string &ConstraintStr = IA->getConstraintString(); 829 Record.push_back(ConstraintStr.size()); 830 for (unsigned i = 0, e = ConstraintStr.size(); i != e; ++i) 831 Record.push_back(ConstraintStr[i]); 832 Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record); 833 Record.clear(); 834 continue; 835 } 836 const Constant *C = cast<Constant>(V); 837 unsigned Code = -1U; 838 unsigned AbbrevToUse = 0; 839 if (C->isNullValue()) { 840 Code = bitc::CST_CODE_NULL; 841 } else if (isa<UndefValue>(C)) { 842 Code = bitc::CST_CODE_UNDEF; 843 } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) { 844 if (IV->getBitWidth() <= 64) { 845 uint64_t V = IV->getSExtValue(); 846 if ((int64_t)V >= 0) 847 Record.push_back(V << 1); 848 else 849 Record.push_back((-V << 1) | 1); 850 Code = bitc::CST_CODE_INTEGER; 851 AbbrevToUse = CONSTANTS_INTEGER_ABBREV; 852 } else { // Wide integers, > 64 bits in size. 853 // We have an arbitrary precision integer value to write whose 854 // bit width is > 64. However, in canonical unsigned integer 855 // format it is likely that the high bits are going to be zero. 856 // So, we only write the number of active words. 857 unsigned NWords = IV->getValue().getActiveWords(); 858 const uint64_t *RawWords = IV->getValue().getRawData(); 859 for (unsigned i = 0; i != NWords; ++i) { 860 int64_t V = RawWords[i]; 861 if (V >= 0) 862 Record.push_back(V << 1); 863 else 864 Record.push_back((-V << 1) | 1); 865 } 866 Code = bitc::CST_CODE_WIDE_INTEGER; 867 } 868 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) { 869 Code = bitc::CST_CODE_FLOAT; 870 Type *Ty = CFP->getType(); 871 if (Ty->isFloatTy() || Ty->isDoubleTy()) { 872 Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue()); 873 } else if (Ty->isX86_FP80Ty()) { 874 // api needed to prevent premature destruction 875 // bits are not in the same order as a normal i80 APInt, compensate. 876 APInt api = CFP->getValueAPF().bitcastToAPInt(); 877 const uint64_t *p = api.getRawData(); 878 Record.push_back((p[1] << 48) | (p[0] >> 16)); 879 Record.push_back(p[0] & 0xffffLL); 880 } else if (Ty->isFP128Ty() || Ty->isPPC_FP128Ty()) { 881 APInt api = CFP->getValueAPF().bitcastToAPInt(); 882 const uint64_t *p = api.getRawData(); 883 Record.push_back(p[0]); 884 Record.push_back(p[1]); 885 } else { 886 assert (0 && "Unknown FP type!"); 887 } 888 } else if (isa<ConstantDataSequential>(C) && 889 cast<ConstantDataSequential>(C)->isString()) { 890 const ConstantDataSequential *Str = cast<ConstantDataSequential>(C); 891 // Emit constant strings specially. 892 unsigned NumElts = Str->getNumElements(); 893 // If this is a null-terminated string, use the denser CSTRING encoding. 894 if (Str->isCString()) { 895 Code = bitc::CST_CODE_CSTRING; 896 --NumElts; // Don't encode the null, which isn't allowed by char6. 897 } else { 898 Code = bitc::CST_CODE_STRING; 899 AbbrevToUse = String8Abbrev; 900 } 901 bool isCStr7 = Code == bitc::CST_CODE_CSTRING; 902 bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING; 903 for (unsigned i = 0; i != NumElts; ++i) { 904 unsigned char V = Str->getElementAsInteger(i); 905 Record.push_back(V); 906 isCStr7 &= (V & 128) == 0; 907 if (isCStrChar6) 908 isCStrChar6 = BitCodeAbbrevOp::isChar6(V); 909 } 910 911 if (isCStrChar6) 912 AbbrevToUse = CString6Abbrev; 913 else if (isCStr7) 914 AbbrevToUse = CString7Abbrev; 915 } else if (const ConstantDataSequential *CDS = 916 dyn_cast<ConstantDataSequential>(C)) { 917 // We must replace ConstantDataSequential's representation with the 918 // legacy ConstantArray/ConstantVector/ConstantStruct version. 919 // ValueEnumerator is similarly modified to mark the appropriate 920 // Constants as used (so they are emitted). 921 Code = bitc::CST_CODE_AGGREGATE; 922 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) 923 Record.push_back(VE.getValueID(CDS->getElementAsConstant(i))); 924 AbbrevToUse = AggregateAbbrev; 925 } else if (isa<ConstantArray>(C) || isa<ConstantStruct>(C) || 926 isa<ConstantVector>(C)) { 927 Code = bitc::CST_CODE_AGGREGATE; 928 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i) 929 Record.push_back(VE.getValueID(C->getOperand(i))); 930 AbbrevToUse = AggregateAbbrev; 931 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) { 932 switch (CE->getOpcode()) { 933 default: 934 if (Instruction::isCast(CE->getOpcode())) { 935 Code = bitc::CST_CODE_CE_CAST; 936 Record.push_back(GetEncodedCastOpcode(CE->getOpcode())); 937 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 938 Record.push_back(VE.getValueID(C->getOperand(0))); 939 AbbrevToUse = CONSTANTS_CE_CAST_Abbrev; 940 } else { 941 assert(CE->getNumOperands() == 2 && "Unknown constant expr!"); 942 Code = bitc::CST_CODE_CE_BINOP; 943 Record.push_back(GetEncodedBinaryOpcode(CE->getOpcode())); 944 Record.push_back(VE.getValueID(C->getOperand(0))); 945 Record.push_back(VE.getValueID(C->getOperand(1))); 946 uint64_t Flags = GetOptimizationFlags(CE); 947 if (Flags != 0) 948 Record.push_back(Flags); 949 } 950 break; 951 case Instruction::GetElementPtr: 952 Code = bitc::CST_CODE_CE_GEP; 953 if (cast<GEPOperator>(C)->isInBounds()) 954 Code = bitc::CST_CODE_CE_INBOUNDS_GEP; 955 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) { 956 Record.push_back(VE.getTypeID(C->getOperand(i)->getType())); 957 Record.push_back(VE.getValueID(C->getOperand(i))); 958 } 959 break; 960 case Instruction::Select: 961 Code = bitc::CST_CODE_CE_SELECT; 962 Record.push_back(VE.getValueID(C->getOperand(0))); 963 Record.push_back(VE.getValueID(C->getOperand(1))); 964 Record.push_back(VE.getValueID(C->getOperand(2))); 965 break; 966 case Instruction::ExtractElement: 967 Code = bitc::CST_CODE_CE_EXTRACTELT; 968 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 969 Record.push_back(VE.getValueID(C->getOperand(0))); 970 Record.push_back(VE.getValueID(C->getOperand(1))); 971 break; 972 case Instruction::InsertElement: 973 Code = bitc::CST_CODE_CE_INSERTELT; 974 Record.push_back(VE.getValueID(C->getOperand(0))); 975 Record.push_back(VE.getValueID(C->getOperand(1))); 976 Record.push_back(VE.getValueID(C->getOperand(2))); 977 break; 978 case Instruction::ShuffleVector: 979 // If the return type and argument types are the same, this is a 980 // standard shufflevector instruction. If the types are different, 981 // then the shuffle is widening or truncating the input vectors, and 982 // the argument type must also be encoded. 983 if (C->getType() == C->getOperand(0)->getType()) { 984 Code = bitc::CST_CODE_CE_SHUFFLEVEC; 985 } else { 986 Code = bitc::CST_CODE_CE_SHUFVEC_EX; 987 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 988 } 989 Record.push_back(VE.getValueID(C->getOperand(0))); 990 Record.push_back(VE.getValueID(C->getOperand(1))); 991 Record.push_back(VE.getValueID(C->getOperand(2))); 992 break; 993 case Instruction::ICmp: 994 case Instruction::FCmp: 995 Code = bitc::CST_CODE_CE_CMP; 996 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 997 Record.push_back(VE.getValueID(C->getOperand(0))); 998 Record.push_back(VE.getValueID(C->getOperand(1))); 999 Record.push_back(CE->getPredicate()); 1000 break; 1001 } 1002 } else if (const BlockAddress *BA = dyn_cast<BlockAddress>(C)) { 1003 Code = bitc::CST_CODE_BLOCKADDRESS; 1004 Record.push_back(VE.getTypeID(BA->getFunction()->getType())); 1005 Record.push_back(VE.getValueID(BA->getFunction())); 1006 Record.push_back(VE.getGlobalBasicBlockID(BA->getBasicBlock())); 1007 } else { 1008 #ifndef NDEBUG 1009 C->dump(); 1010 #endif 1011 llvm_unreachable("Unknown constant!"); 1012 } 1013 Stream.EmitRecord(Code, Record, AbbrevToUse); 1014 Record.clear(); 1015 } 1016 1017 Stream.ExitBlock(); 1018 } 1019 1020 static void WriteModuleConstants(const llvm_2_9::ValueEnumerator &VE, 1021 BitstreamWriter &Stream) { 1022 const llvm_2_9::ValueEnumerator::ValueList &Vals = VE.getValues(); 1023 1024 // Find the first constant to emit, which is the first non-globalvalue value. 1025 // We know globalvalues have been emitted by WriteModuleInfo. 1026 for (unsigned i = 0, e = Vals.size(); i != e; ++i) { 1027 if (!isa<GlobalValue>(Vals[i].first)) { 1028 WriteConstants(i, Vals.size(), VE, Stream, true); 1029 return; 1030 } 1031 } 1032 } 1033 1034 /// PushValueAndType - The file has to encode both the value and type id for 1035 /// many values, because we need to know what type to create for forward 1036 /// references. However, most operands are not forward references, so this type 1037 /// field is not needed. 1038 /// 1039 /// This function adds V's value ID to Vals. If the value ID is higher than the 1040 /// instruction ID, then it is a forward reference, and it also includes the 1041 /// type ID. 1042 static bool PushValueAndType(const Value *V, unsigned InstID, 1043 SmallVector<unsigned, 64> &Vals, 1044 llvm_2_9::ValueEnumerator &VE) { 1045 unsigned ValID = VE.getValueID(V); 1046 Vals.push_back(ValID); 1047 if (ValID >= InstID) { 1048 Vals.push_back(VE.getTypeID(V->getType())); 1049 return true; 1050 } 1051 return false; 1052 } 1053 1054 /// WriteInstruction - Emit an instruction to the specified stream. 1055 static void WriteInstruction(const Instruction &I, unsigned InstID, 1056 llvm_2_9::ValueEnumerator &VE, 1057 BitstreamWriter &Stream, 1058 SmallVector<unsigned, 64> &Vals) { 1059 unsigned Code = 0; 1060 unsigned AbbrevToUse = 0; 1061 VE.setInstructionID(&I); 1062 switch (I.getOpcode()) { 1063 default: 1064 if (Instruction::isCast(I.getOpcode())) { 1065 Code = bitc::FUNC_CODE_INST_CAST; 1066 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 1067 AbbrevToUse = FUNCTION_INST_CAST_ABBREV; 1068 Vals.push_back(VE.getTypeID(I.getType())); 1069 Vals.push_back(GetEncodedCastOpcode(I.getOpcode())); 1070 } else { 1071 assert(isa<BinaryOperator>(I) && "Unknown instruction!"); 1072 Code = bitc::FUNC_CODE_INST_BINOP; 1073 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 1074 AbbrevToUse = FUNCTION_INST_BINOP_ABBREV; 1075 Vals.push_back(VE.getValueID(I.getOperand(1))); 1076 Vals.push_back(GetEncodedBinaryOpcode(I.getOpcode())); 1077 uint64_t Flags = GetOptimizationFlags(&I); 1078 if (Flags != 0) { 1079 if (AbbrevToUse == FUNCTION_INST_BINOP_ABBREV) 1080 AbbrevToUse = FUNCTION_INST_BINOP_FLAGS_ABBREV; 1081 Vals.push_back(Flags); 1082 } 1083 } 1084 break; 1085 1086 case Instruction::GetElementPtr: 1087 Code = bitc::FUNC_CODE_INST_GEP; 1088 if (cast<GEPOperator>(&I)->isInBounds()) 1089 Code = bitc::FUNC_CODE_INST_INBOUNDS_GEP; 1090 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 1091 PushValueAndType(I.getOperand(i), InstID, Vals, VE); 1092 break; 1093 case Instruction::ExtractValue: { 1094 Code = bitc::FUNC_CODE_INST_EXTRACTVAL; 1095 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1096 const ExtractValueInst *EVI = cast<ExtractValueInst>(&I); 1097 for (const unsigned *i = EVI->idx_begin(), *e = EVI->idx_end(); i != e; ++i) 1098 Vals.push_back(*i); 1099 break; 1100 } 1101 case Instruction::InsertValue: { 1102 Code = bitc::FUNC_CODE_INST_INSERTVAL; 1103 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1104 PushValueAndType(I.getOperand(1), InstID, Vals, VE); 1105 const InsertValueInst *IVI = cast<InsertValueInst>(&I); 1106 for (const unsigned *i = IVI->idx_begin(), *e = IVI->idx_end(); i != e; ++i) 1107 Vals.push_back(*i); 1108 break; 1109 } 1110 case Instruction::Select: 1111 Code = bitc::FUNC_CODE_INST_VSELECT; 1112 PushValueAndType(I.getOperand(1), InstID, Vals, VE); 1113 Vals.push_back(VE.getValueID(I.getOperand(2))); 1114 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1115 break; 1116 case Instruction::ExtractElement: 1117 Code = bitc::FUNC_CODE_INST_EXTRACTELT; 1118 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1119 Vals.push_back(VE.getValueID(I.getOperand(1))); 1120 break; 1121 case Instruction::InsertElement: 1122 Code = bitc::FUNC_CODE_INST_INSERTELT; 1123 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1124 Vals.push_back(VE.getValueID(I.getOperand(1))); 1125 Vals.push_back(VE.getValueID(I.getOperand(2))); 1126 break; 1127 case Instruction::ShuffleVector: 1128 Code = bitc::FUNC_CODE_INST_SHUFFLEVEC; 1129 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1130 Vals.push_back(VE.getValueID(I.getOperand(1))); 1131 Vals.push_back(VE.getValueID(I.getOperand(2))); 1132 break; 1133 case Instruction::ICmp: 1134 case Instruction::FCmp: 1135 // compare returning Int1Ty or vector of Int1Ty 1136 Code = bitc::FUNC_CODE_INST_CMP2; 1137 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1138 Vals.push_back(VE.getValueID(I.getOperand(1))); 1139 Vals.push_back(cast<CmpInst>(I).getPredicate()); 1140 break; 1141 1142 case Instruction::Ret: 1143 { 1144 Code = bitc::FUNC_CODE_INST_RET; 1145 unsigned NumOperands = I.getNumOperands(); 1146 if (NumOperands == 0) 1147 AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV; 1148 else if (NumOperands == 1) { 1149 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 1150 AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV; 1151 } else { 1152 for (unsigned i = 0, e = NumOperands; i != e; ++i) 1153 PushValueAndType(I.getOperand(i), InstID, Vals, VE); 1154 } 1155 } 1156 break; 1157 case Instruction::Br: 1158 { 1159 Code = bitc::FUNC_CODE_INST_BR; 1160 BranchInst &II = cast<BranchInst>(I); 1161 Vals.push_back(VE.getValueID(II.getSuccessor(0))); 1162 if (II.isConditional()) { 1163 Vals.push_back(VE.getValueID(II.getSuccessor(1))); 1164 Vals.push_back(VE.getValueID(II.getCondition())); 1165 } 1166 } 1167 break; 1168 case Instruction::Switch: 1169 { 1170 Code = bitc::FUNC_CODE_INST_SWITCH; 1171 SwitchInst &SI = cast<SwitchInst>(I); 1172 1173 Vals.push_back(VE.getTypeID(SI.getCondition()->getType())); 1174 Vals.push_back(VE.getValueID(SI.getCondition())); 1175 Vals.push_back(VE.getValueID(SI.getDefaultDest())); 1176 for (SwitchInst::CaseIt i = SI.case_begin(), e = SI.case_end(); 1177 i != e; ++i) { 1178 IntegersSubset& CaseRanges = i.getCaseValueEx(); 1179 1180 if (CaseRanges.isSingleNumber()) { 1181 Vals.push_back(VE.getValueID(CaseRanges.getSingleNumber(0).toConstantInt())); 1182 Vals.push_back(VE.getValueID(i.getCaseSuccessor())); 1183 } else if (CaseRanges.isSingleNumbersOnly()) { 1184 for (unsigned ri = 0, rn = CaseRanges.getNumItems(); 1185 ri != rn; ++ri) { 1186 Vals.push_back(VE.getValueID(CaseRanges.getSingleNumber(ri).toConstantInt())); 1187 Vals.push_back(VE.getValueID(i.getCaseSuccessor())); 1188 } 1189 } else { 1190 llvm_unreachable("Not single number?"); 1191 } 1192 } 1193 } 1194 break; 1195 case Instruction::IndirectBr: 1196 Code = bitc::FUNC_CODE_INST_INDIRECTBR; 1197 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 1198 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 1199 Vals.push_back(VE.getValueID(I.getOperand(i))); 1200 break; 1201 1202 case Instruction::Invoke: { 1203 const InvokeInst *II = cast<InvokeInst>(&I); 1204 const Value *Callee(II->getCalledValue()); 1205 PointerType *PTy = cast<PointerType>(Callee->getType()); 1206 FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 1207 Code = bitc::FUNC_CODE_INST_INVOKE; 1208 1209 Vals.push_back(VE.getAttributeID(II->getAttributes())); 1210 Vals.push_back(II->getCallingConv()); 1211 Vals.push_back(VE.getValueID(II->getNormalDest())); 1212 Vals.push_back(VE.getValueID(II->getUnwindDest())); 1213 PushValueAndType(Callee, InstID, Vals, VE); 1214 1215 // Emit value #'s for the fixed parameters. 1216 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) 1217 Vals.push_back(VE.getValueID(I.getOperand(i))); // fixed param. 1218 1219 // Emit type/value pairs for varargs params. 1220 if (FTy->isVarArg()) { 1221 for (unsigned i = FTy->getNumParams(), e = I.getNumOperands()-3; 1222 i != e; ++i) 1223 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // vararg 1224 } 1225 break; 1226 } 1227 case Instruction::Unreachable: 1228 Code = bitc::FUNC_CODE_INST_UNREACHABLE; 1229 AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV; 1230 break; 1231 1232 case Instruction::PHI: { 1233 const PHINode &PN = cast<PHINode>(I); 1234 Code = bitc::FUNC_CODE_INST_PHI; 1235 Vals.push_back(VE.getTypeID(PN.getType())); 1236 for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i) { 1237 Vals.push_back(VE.getValueID(PN.getIncomingValue(i))); 1238 Vals.push_back(VE.getValueID(PN.getIncomingBlock(i))); 1239 } 1240 break; 1241 } 1242 1243 case Instruction::Alloca: 1244 Code = bitc::FUNC_CODE_INST_ALLOCA; 1245 Vals.push_back(VE.getTypeID(I.getType())); 1246 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 1247 Vals.push_back(VE.getValueID(I.getOperand(0))); // size. 1248 Vals.push_back(Log2_32(cast<AllocaInst>(I).getAlignment())+1); 1249 break; 1250 1251 case Instruction::Load: 1252 Code = bitc::FUNC_CODE_INST_LOAD; 1253 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) // ptr 1254 AbbrevToUse = FUNCTION_INST_LOAD_ABBREV; 1255 1256 Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1); 1257 Vals.push_back(cast<LoadInst>(I).isVolatile()); 1258 break; 1259 case Instruction::Store: 1260 Code = bitc::FUNC_CODE_INST_STORE; 1261 PushValueAndType(I.getOperand(1), InstID, Vals, VE); // ptrty + ptr 1262 Vals.push_back(VE.getValueID(I.getOperand(0))); // val. 1263 Vals.push_back(Log2_32(cast<StoreInst>(I).getAlignment())+1); 1264 Vals.push_back(cast<StoreInst>(I).isVolatile()); 1265 break; 1266 case Instruction::Call: { 1267 const CallInst &CI = cast<CallInst>(I); 1268 PointerType *PTy = cast<PointerType>(CI.getCalledValue()->getType()); 1269 FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 1270 1271 Code = FUNC_CODE_INST_CALL_2_7; 1272 1273 Vals.push_back(VE.getAttributeID(CI.getAttributes())); 1274 Vals.push_back((CI.getCallingConv() << 1) | unsigned(CI.isTailCall())); 1275 PushValueAndType(CI.getCalledValue(), InstID, Vals, VE); // Callee 1276 1277 // Emit value #'s for the fixed parameters. 1278 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) 1279 Vals.push_back(VE.getValueID(CI.getArgOperand(i))); // fixed param. 1280 1281 // Emit type/value pairs for varargs params. 1282 if (FTy->isVarArg()) { 1283 for (unsigned i = FTy->getNumParams(), e = CI.getNumArgOperands(); 1284 i != e; ++i) 1285 PushValueAndType(CI.getArgOperand(i), InstID, Vals, VE); // varargs 1286 } 1287 break; 1288 } 1289 case Instruction::VAArg: 1290 Code = bitc::FUNC_CODE_INST_VAARG; 1291 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); // valistty 1292 Vals.push_back(VE.getValueID(I.getOperand(0))); // valist. 1293 Vals.push_back(VE.getTypeID(I.getType())); // restype. 1294 break; 1295 } 1296 1297 Stream.EmitRecord(Code, Vals, AbbrevToUse); 1298 Vals.clear(); 1299 } 1300 1301 // Emit names for globals/functions etc. 1302 static void WriteValueSymbolTable(const ValueSymbolTable &VST, 1303 const llvm_2_9::ValueEnumerator &VE, 1304 BitstreamWriter &Stream) { 1305 if (VST.empty()) return; 1306 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4); 1307 1308 // FIXME: Set up the abbrev, we know how many values there are! 1309 // FIXME: We know if the type names can use 7-bit ascii. 1310 SmallVector<unsigned, 64> NameVals; 1311 1312 for (ValueSymbolTable::const_iterator SI = VST.begin(), SE = VST.end(); 1313 SI != SE; ++SI) { 1314 1315 const ValueName &Name = *SI; 1316 1317 // Figure out the encoding to use for the name. 1318 bool is7Bit = true; 1319 bool isChar6 = true; 1320 for (const char *C = Name.getKeyData(), *E = C+Name.getKeyLength(); 1321 C != E; ++C) { 1322 if (isChar6) 1323 isChar6 = BitCodeAbbrevOp::isChar6(*C); 1324 if ((unsigned char)*C & 128) { 1325 is7Bit = false; 1326 break; // don't bother scanning the rest. 1327 } 1328 } 1329 1330 unsigned AbbrevToUse = VST_ENTRY_8_ABBREV; 1331 1332 // VST_ENTRY: [valueid, namechar x N] 1333 // VST_BBENTRY: [bbid, namechar x N] 1334 unsigned Code; 1335 if (isa<BasicBlock>(SI->getValue())) { 1336 Code = bitc::VST_CODE_BBENTRY; 1337 if (isChar6) 1338 AbbrevToUse = VST_BBENTRY_6_ABBREV; 1339 } else { 1340 Code = bitc::VST_CODE_ENTRY; 1341 if (isChar6) 1342 AbbrevToUse = VST_ENTRY_6_ABBREV; 1343 else if (is7Bit) 1344 AbbrevToUse = VST_ENTRY_7_ABBREV; 1345 } 1346 1347 NameVals.push_back(VE.getValueID(SI->getValue())); 1348 for (const char *P = Name.getKeyData(), 1349 *E = Name.getKeyData()+Name.getKeyLength(); P != E; ++P) 1350 NameVals.push_back((unsigned char)*P); 1351 1352 // Emit the finished record. 1353 Stream.EmitRecord(Code, NameVals, AbbrevToUse); 1354 NameVals.clear(); 1355 } 1356 Stream.ExitBlock(); 1357 } 1358 1359 /// WriteFunction - Emit a function body to the module stream. 1360 static void WriteFunction(const Function &F, llvm_2_9::ValueEnumerator &VE, 1361 BitstreamWriter &Stream) { 1362 Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4); 1363 VE.incorporateFunction(F); 1364 1365 SmallVector<unsigned, 64> Vals; 1366 1367 // Emit the number of basic blocks, so the reader can create them ahead of 1368 // time. 1369 Vals.push_back(VE.getBasicBlocks().size()); 1370 Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals); 1371 Vals.clear(); 1372 1373 // If there are function-local constants, emit them now. 1374 unsigned CstStart, CstEnd; 1375 VE.getFunctionConstantRange(CstStart, CstEnd); 1376 WriteConstants(CstStart, CstEnd, VE, Stream, false); 1377 1378 // If there is function-local metadata, emit it now. 1379 WriteFunctionLocalMetadata(F, VE, Stream); 1380 1381 // Keep a running idea of what the instruction ID is. 1382 unsigned InstID = CstEnd; 1383 1384 bool NeedsMetadataAttachment = false; 1385 1386 DebugLoc LastDL; 1387 1388 // Finally, emit all the instructions, in order. 1389 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) 1390 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); 1391 I != E; ++I) { 1392 WriteInstruction(*I, InstID, VE, Stream, Vals); 1393 1394 if (!I->getType()->isVoidTy()) 1395 ++InstID; 1396 1397 // If the instruction has metadata, write a metadata attachment later. 1398 NeedsMetadataAttachment |= I->hasMetadataOtherThanDebugLoc(); 1399 1400 // If the instruction has a debug location, emit it. 1401 DebugLoc DL = I->getDebugLoc(); 1402 if (DL.isUnknown()) { 1403 // nothing todo. 1404 } else if (DL == LastDL) { 1405 // Just repeat the same debug loc as last time. 1406 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC_AGAIN, Vals); 1407 } else { 1408 MDNode *Scope, *IA; 1409 DL.getScopeAndInlinedAt(Scope, IA, I->getContext()); 1410 1411 Vals.push_back(DL.getLine()); 1412 Vals.push_back(DL.getCol()); 1413 Vals.push_back(Scope ? VE.getValueID(Scope)+1 : 0); 1414 Vals.push_back(IA ? VE.getValueID(IA)+1 : 0); 1415 Stream.EmitRecord(FUNC_CODE_DEBUG_LOC_2_7, Vals); 1416 Vals.clear(); 1417 1418 LastDL = DL; 1419 } 1420 } 1421 1422 // Emit names for all the instructions etc. 1423 WriteValueSymbolTable(F.getValueSymbolTable(), VE, Stream); 1424 1425 if (NeedsMetadataAttachment) 1426 WriteMetadataAttachment(F, VE, Stream); 1427 VE.purgeFunction(); 1428 Stream.ExitBlock(); 1429 } 1430 1431 // Emit blockinfo, which defines the standard abbreviations etc. 1432 static void WriteBlockInfo(const llvm_2_9::ValueEnumerator &VE, 1433 BitstreamWriter &Stream) { 1434 // We only want to emit block info records for blocks that have multiple 1435 // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK. Other 1436 // blocks can defined their abbrevs inline. 1437 Stream.EnterBlockInfoBlock(2); 1438 1439 { // 8-bit fixed-width VST_ENTRY/VST_BBENTRY strings. 1440 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1441 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); 1442 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1443 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1444 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 1445 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1446 Abbv) != VST_ENTRY_8_ABBREV) 1447 llvm_unreachable("Unexpected abbrev ordering!"); 1448 } 1449 1450 { // 7-bit fixed width VST_ENTRY strings. 1451 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1452 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 1453 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1454 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1455 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 1456 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1457 Abbv) != VST_ENTRY_7_ABBREV) 1458 llvm_unreachable("Unexpected abbrev ordering!"); 1459 } 1460 { // 6-bit char6 VST_ENTRY strings. 1461 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1462 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 1463 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1464 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1465 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 1466 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1467 Abbv) != VST_ENTRY_6_ABBREV) 1468 llvm_unreachable("Unexpected abbrev ordering!"); 1469 } 1470 { // 6-bit char6 VST_BBENTRY strings. 1471 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1472 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY)); 1473 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1474 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1475 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 1476 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1477 Abbv) != VST_BBENTRY_6_ABBREV) 1478 llvm_unreachable("Unexpected abbrev ordering!"); 1479 } 1480 1481 1482 1483 { // SETTYPE abbrev for CONSTANTS_BLOCK. 1484 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1485 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE)); 1486 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1487 Log2_32_Ceil(VE.getTypes().size()+1))); 1488 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1489 Abbv) != CONSTANTS_SETTYPE_ABBREV) 1490 llvm_unreachable("Unexpected abbrev ordering!"); 1491 } 1492 1493 { // INTEGER abbrev for CONSTANTS_BLOCK. 1494 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1495 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER)); 1496 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1497 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1498 Abbv) != CONSTANTS_INTEGER_ABBREV) 1499 llvm_unreachable("Unexpected abbrev ordering!"); 1500 } 1501 1502 { // CE_CAST abbrev for CONSTANTS_BLOCK. 1503 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1504 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST)); 1505 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // cast opc 1506 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid 1507 Log2_32_Ceil(VE.getTypes().size()+1))); 1508 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id 1509 1510 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1511 Abbv) != CONSTANTS_CE_CAST_Abbrev) 1512 llvm_unreachable("Unexpected abbrev ordering!"); 1513 } 1514 { // NULL abbrev for CONSTANTS_BLOCK. 1515 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1516 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL)); 1517 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1518 Abbv) != CONSTANTS_NULL_Abbrev) 1519 llvm_unreachable("Unexpected abbrev ordering!"); 1520 } 1521 1522 // FIXME: This should only use space for first class types! 1523 1524 { // INST_LOAD abbrev for FUNCTION_BLOCK. 1525 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1526 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD)); 1527 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr 1528 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align 1529 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile 1530 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1531 Abbv) != FUNCTION_INST_LOAD_ABBREV) 1532 llvm_unreachable("Unexpected abbrev ordering!"); 1533 } 1534 { // INST_BINOP abbrev for FUNCTION_BLOCK. 1535 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1536 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP)); 1537 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS 1538 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS 1539 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1540 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1541 Abbv) != FUNCTION_INST_BINOP_ABBREV) 1542 llvm_unreachable("Unexpected abbrev ordering!"); 1543 } 1544 { // INST_BINOP_FLAGS abbrev for FUNCTION_BLOCK. 1545 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1546 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP)); 1547 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS 1548 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS 1549 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1550 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); // flags 1551 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1552 Abbv) != FUNCTION_INST_BINOP_FLAGS_ABBREV) 1553 llvm_unreachable("Unexpected abbrev ordering!"); 1554 } 1555 { // INST_CAST abbrev for FUNCTION_BLOCK. 1556 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1557 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST)); 1558 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // OpVal 1559 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty 1560 Log2_32_Ceil(VE.getTypes().size()+1))); 1561 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1562 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1563 Abbv) != FUNCTION_INST_CAST_ABBREV) 1564 llvm_unreachable("Unexpected abbrev ordering!"); 1565 } 1566 1567 { // INST_RET abbrev for FUNCTION_BLOCK. 1568 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1569 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET)); 1570 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1571 Abbv) != FUNCTION_INST_RET_VOID_ABBREV) 1572 llvm_unreachable("Unexpected abbrev ordering!"); 1573 } 1574 { // INST_RET abbrev for FUNCTION_BLOCK. 1575 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1576 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET)); 1577 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID 1578 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1579 Abbv) != FUNCTION_INST_RET_VAL_ABBREV) 1580 llvm_unreachable("Unexpected abbrev ordering!"); 1581 } 1582 { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK. 1583 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1584 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE)); 1585 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1586 Abbv) != FUNCTION_INST_UNREACHABLE_ABBREV) 1587 llvm_unreachable("Unexpected abbrev ordering!"); 1588 } 1589 1590 Stream.ExitBlock(); 1591 } 1592 1593 1594 /// WriteModule - Emit the specified module to the bitstream. 1595 static void WriteModule(const Module *M, BitstreamWriter &Stream) { 1596 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3); 1597 1598 // Emit the version number if it is non-zero. 1599 if (CurVersion) { 1600 SmallVector<unsigned, 1> Vals; 1601 Vals.push_back(CurVersion); 1602 Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals); 1603 } 1604 1605 // Analyze the module, enumerating globals, functions, etc. 1606 llvm_2_9::ValueEnumerator VE(M); 1607 1608 // Emit blockinfo, which defines the standard abbreviations etc. 1609 WriteBlockInfo(VE, Stream); 1610 1611 // Emit information about parameter attributes. 1612 WriteAttributeTable(VE, Stream); 1613 1614 // Emit information describing all of the types in the module. 1615 WriteTypeTable(VE, Stream); 1616 1617 // Emit top-level description of module, including target triple, inline asm, 1618 // descriptors for global variables, and function prototype info. 1619 WriteModuleInfo(M, VE, Stream); 1620 1621 // Emit constants. 1622 WriteModuleConstants(VE, Stream); 1623 1624 // Emit metadata. 1625 WriteModuleMetadata(M, VE, Stream); 1626 1627 // Emit function bodies. 1628 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) 1629 if (!F->isDeclaration()) 1630 WriteFunction(*F, VE, Stream); 1631 1632 // Emit metadata. 1633 WriteModuleMetadataStore(M, Stream); 1634 1635 // Emit names for globals/functions etc. 1636 WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream); 1637 1638 Stream.ExitBlock(); 1639 } 1640 1641 /// EmitDarwinBCHeader - If generating a bc file on darwin, we have to emit a 1642 /// header and trailer to make it compatible with the system archiver. To do 1643 /// this we emit the following header, and then emit a trailer that pads the 1644 /// file out to be a multiple of 16 bytes. 1645 /// 1646 /// struct bc_header { 1647 /// uint32_t Magic; // 0x0B17C0DE 1648 /// uint32_t Version; // Version, currently always 0. 1649 /// uint32_t BitcodeOffset; // Offset to traditional bitcode file. 1650 /// uint32_t BitcodeSize; // Size of traditional bitcode file. 1651 /// uint32_t CPUType; // CPU specifier. 1652 /// ... potentially more later ... 1653 /// }; 1654 enum { 1655 DarwinBCSizeFieldOffset = 3*4, // Offset to bitcode_size. 1656 DarwinBCHeaderSize = 5*4 1657 }; 1658 1659 static void WriteInt32ToBuffer(uint32_t Value, SmallVectorImpl<char> &Buffer, 1660 uint32_t &Position) { 1661 Buffer[Position + 0] = (unsigned char) (Value >> 0); 1662 Buffer[Position + 1] = (unsigned char) (Value >> 8); 1663 Buffer[Position + 2] = (unsigned char) (Value >> 16); 1664 Buffer[Position + 3] = (unsigned char) (Value >> 24); 1665 Position += 4; 1666 } 1667 1668 static void EmitDarwinBCHeaderAndTrailer(SmallVectorImpl<char> &Buffer, 1669 const Triple &TT) { 1670 unsigned CPUType = ~0U; 1671 1672 // Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*, arm-*, thumb-*, 1673 // armv[0-9]-*, thumbv[0-9]-*, armv5te-*, or armv6t2-*. The CPUType is a magic 1674 // number from /usr/include/mach/machine.h. It is ok to reproduce the 1675 // specific constants here because they are implicitly part of the Darwin ABI. 1676 enum { 1677 DARWIN_CPU_ARCH_ABI64 = 0x01000000, 1678 DARWIN_CPU_TYPE_X86 = 7, 1679 DARWIN_CPU_TYPE_ARM = 12, 1680 DARWIN_CPU_TYPE_POWERPC = 18 1681 }; 1682 1683 Triple::ArchType Arch = TT.getArch(); 1684 if (Arch == Triple::x86_64) 1685 CPUType = DARWIN_CPU_TYPE_X86 | DARWIN_CPU_ARCH_ABI64; 1686 else if (Arch == Triple::x86) 1687 CPUType = DARWIN_CPU_TYPE_X86; 1688 else if (Arch == Triple::ppc) 1689 CPUType = DARWIN_CPU_TYPE_POWERPC; 1690 else if (Arch == Triple::ppc64) 1691 CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64; 1692 else if (Arch == Triple::arm || Arch == Triple::thumb) 1693 CPUType = DARWIN_CPU_TYPE_ARM; 1694 1695 // Traditional Bitcode starts after header. 1696 assert(Buffer.size() >= DarwinBCHeaderSize && 1697 "Expected header size to be reserved"); 1698 unsigned BCOffset = DarwinBCHeaderSize; 1699 unsigned BCSize = Buffer.size()-DarwinBCHeaderSize; 1700 1701 // Write the magic and version. 1702 unsigned Position = 0; 1703 WriteInt32ToBuffer(0x0B17C0DE , Buffer, Position); 1704 WriteInt32ToBuffer(0 , Buffer, Position); // Version. 1705 WriteInt32ToBuffer(BCOffset , Buffer, Position); 1706 WriteInt32ToBuffer(BCSize , Buffer, Position); 1707 WriteInt32ToBuffer(CPUType , Buffer, Position); 1708 1709 // If the file is not a multiple of 16 bytes, insert dummy padding. 1710 while (Buffer.size() & 15) 1711 Buffer.push_back(0); 1712 } 1713 1714 /// WriteBitcodeToFile - Write the specified module to the specified output 1715 /// stream. 1716 void llvm_2_9::WriteBitcodeToFile(const Module *M, raw_ostream &Out) { 1717 SmallVector<char, 1024> Buffer; 1718 Buffer.reserve(256*1024); 1719 1720 // If this is darwin or another generic macho target, reserve space for the 1721 // header. 1722 Triple TT(M->getTargetTriple()); 1723 if (TT.isOSDarwin()) 1724 Buffer.insert(Buffer.begin(), DarwinBCHeaderSize, 0); 1725 1726 // Emit the module into the buffer. 1727 { 1728 BitstreamWriter Stream(Buffer); 1729 1730 // Emit the file header. 1731 Stream.Emit((unsigned)'B', 8); 1732 Stream.Emit((unsigned)'C', 8); 1733 Stream.Emit(0x0, 4); 1734 Stream.Emit(0xC, 4); 1735 Stream.Emit(0xE, 4); 1736 Stream.Emit(0xD, 4); 1737 1738 // Emit the module. 1739 WriteModule(M, Stream); 1740 } 1741 1742 if (TT.isOSDarwin()) 1743 EmitDarwinBCHeaderAndTrailer(Buffer, TT); 1744 1745 // Write the generated bitstream to "Out". 1746 Out.write((char*)&Buffer.front(), Buffer.size()); 1747 } 1748
