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