BitcodeWriter.cpp revision 23c4358f12bd9d0ba7166eceebd683db95a41b3f
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_func.h" 15#include "ValueEnumerator.h" 16#include "llvm/ADT/Triple.h" 17#include "llvm/Bitcode/BitstreamWriter.h" 18#include "llvm/Bitcode/LLVMBitCodes.h" 19#include "llvm/IR/Constants.h" 20#include "llvm/IR/DerivedTypes.h" 21#include "llvm/IR/InlineAsm.h" 22#include "llvm/IR/Instructions.h" 23#include "llvm/IR/Module.h" 24#include "llvm/IR/Operator.h" 25#include "llvm/IR/ValueSymbolTable.h" 26#include "llvm/Support/ErrorHandling.h" 27#include "llvm/Support/MathExtras.h" 28#include "llvm/Support/Program.h" 29#include "llvm/Support/raw_ostream.h" 30#include <cctype> 31#include <map> 32using namespace llvm; 33 34/// These are manifest constants used by the bitcode writer. They do not need to 35/// be kept in sync with the reader, but need to be consistent within this file. 36enum { 37 CurVersion = 0, 38 39 // VALUE_SYMTAB_BLOCK abbrev id's. 40 VST_ENTRY_8_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 41 VST_ENTRY_7_ABBREV, 42 VST_ENTRY_6_ABBREV, 43 VST_BBENTRY_6_ABBREV, 44 45 // CONSTANTS_BLOCK abbrev id's. 46 CONSTANTS_SETTYPE_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 47 CONSTANTS_INTEGER_ABBREV, 48 CONSTANTS_CE_CAST_Abbrev, 49 CONSTANTS_NULL_Abbrev, 50 51 // FUNCTION_BLOCK abbrev id's. 52 FUNCTION_INST_LOAD_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 53 FUNCTION_INST_BINOP_ABBREV, 54 FUNCTION_INST_BINOP_FLAGS_ABBREV, 55 FUNCTION_INST_CAST_ABBREV, 56 FUNCTION_INST_RET_VOID_ABBREV, 57 FUNCTION_INST_RET_VAL_ABBREV, 58 FUNCTION_INST_UNREACHABLE_ABBREV 59}; 60 61 62static unsigned GetEncodedCastOpcode(unsigned Opcode) { 63 switch (Opcode) { 64 default: llvm_unreachable("Unknown cast instruction!"); 65 case Instruction::Trunc : return bitc::CAST_TRUNC; 66 case Instruction::ZExt : return bitc::CAST_ZEXT; 67 case Instruction::SExt : return bitc::CAST_SEXT; 68 case Instruction::FPToUI : return bitc::CAST_FPTOUI; 69 case Instruction::FPToSI : return bitc::CAST_FPTOSI; 70 case Instruction::UIToFP : return bitc::CAST_UITOFP; 71 case Instruction::SIToFP : return bitc::CAST_SITOFP; 72 case Instruction::FPTrunc : return bitc::CAST_FPTRUNC; 73 case Instruction::FPExt : return bitc::CAST_FPEXT; 74 case Instruction::PtrToInt: return bitc::CAST_PTRTOINT; 75 case Instruction::IntToPtr: return bitc::CAST_INTTOPTR; 76 case Instruction::BitCast : return bitc::CAST_BITCAST; 77 } 78} 79 80static unsigned GetEncodedBinaryOpcode(unsigned Opcode) { 81 switch (Opcode) { 82 default: llvm_unreachable("Unknown binary instruction!"); 83 case Instruction::Add: 84 case Instruction::FAdd: return bitc::BINOP_ADD; 85 case Instruction::Sub: 86 case Instruction::FSub: return bitc::BINOP_SUB; 87 case Instruction::Mul: 88 case Instruction::FMul: return bitc::BINOP_MUL; 89 case Instruction::UDiv: return bitc::BINOP_UDIV; 90 case Instruction::FDiv: 91 case Instruction::SDiv: return bitc::BINOP_SDIV; 92 case Instruction::URem: return bitc::BINOP_UREM; 93 case Instruction::FRem: 94 case Instruction::SRem: return bitc::BINOP_SREM; 95 case Instruction::Shl: return bitc::BINOP_SHL; 96 case Instruction::LShr: return bitc::BINOP_LSHR; 97 case Instruction::AShr: return bitc::BINOP_ASHR; 98 case Instruction::And: return bitc::BINOP_AND; 99 case Instruction::Or: return bitc::BINOP_OR; 100 case Instruction::Xor: return bitc::BINOP_XOR; 101 } 102} 103 104static unsigned GetEncodedRMWOperation(AtomicRMWInst::BinOp Op) { 105 switch (Op) { 106 default: llvm_unreachable("Unknown RMW operation!"); 107 case AtomicRMWInst::Xchg: return bitc::RMW_XCHG; 108 case AtomicRMWInst::Add: return bitc::RMW_ADD; 109 case AtomicRMWInst::Sub: return bitc::RMW_SUB; 110 case AtomicRMWInst::And: return bitc::RMW_AND; 111 case AtomicRMWInst::Nand: return bitc::RMW_NAND; 112 case AtomicRMWInst::Or: return bitc::RMW_OR; 113 case AtomicRMWInst::Xor: return bitc::RMW_XOR; 114 case AtomicRMWInst::Max: return bitc::RMW_MAX; 115 case AtomicRMWInst::Min: return bitc::RMW_MIN; 116 case AtomicRMWInst::UMax: return bitc::RMW_UMAX; 117 case AtomicRMWInst::UMin: return bitc::RMW_UMIN; 118 } 119} 120 121static unsigned GetEncodedOrdering(AtomicOrdering Ordering) { 122 switch (Ordering) { 123 default: llvm_unreachable("Unknown atomic ordering"); 124 case NotAtomic: return bitc::ORDERING_NOTATOMIC; 125 case Unordered: return bitc::ORDERING_UNORDERED; 126 case Monotonic: return bitc::ORDERING_MONOTONIC; 127 case Acquire: return bitc::ORDERING_ACQUIRE; 128 case Release: return bitc::ORDERING_RELEASE; 129 case AcquireRelease: return bitc::ORDERING_ACQREL; 130 case SequentiallyConsistent: return bitc::ORDERING_SEQCST; 131 } 132} 133 134static unsigned GetEncodedSynchScope(SynchronizationScope SynchScope) { 135 switch (SynchScope) { 136 default: llvm_unreachable("Unknown synchronization scope"); 137 case SingleThread: return bitc::SYNCHSCOPE_SINGLETHREAD; 138 case CrossThread: return bitc::SYNCHSCOPE_CROSSTHREAD; 139 } 140} 141 142static void WriteStringRecord(unsigned Code, StringRef Str, 143 unsigned AbbrevToUse, BitstreamWriter &Stream) { 144 SmallVector<unsigned, 64> Vals; 145 146 // Code: [strchar x N] 147 for (unsigned i = 0, e = Str.size(); i != e; ++i) { 148 if (AbbrevToUse && !BitCodeAbbrevOp::isChar6(Str[i])) 149 AbbrevToUse = 0; 150 Vals.push_back(Str[i]); 151 } 152 153 // Emit the finished record. 154 Stream.EmitRecord(Code, Vals, AbbrevToUse); 155} 156 157// Emit information about parameter attributes. 158static void WriteAttributeTable(const llvm_2_9_func::ValueEnumerator &VE, 159 BitstreamWriter &Stream) { 160 const std::vector<AttributeSet> &Attrs = VE.getAttributes(); 161 if (Attrs.empty()) return; 162 163 Stream.EnterSubblock(bitc::PARAMATTR_BLOCK_ID, 3); 164 165 SmallVector<uint64_t, 64> Record; 166 for (unsigned i = 0, e = Attrs.size(); i != e; ++i) { 167 const AttributeSet &A = Attrs[i]; 168 for (unsigned i = 0, e = A.getNumSlots(); i != e; ++i) { 169 const AttributeWithIndex &PAWI = A.getSlot(i); 170 Record.push_back(PAWI.Index); 171 Record.push_back(Attribute::encodeLLVMAttributesForBitcode(PAWI.Attrs)); 172#if 0 173 // FIXME: remove in LLVM 3.0 174 // Store the alignment in the bitcode as a 16-bit raw value instead of a 175 // 5-bit log2 encoded value. Shift the bits above the alignment up by 176 // 11 bits. 177 uint64_t FauxAttr = PAWI.Attrs.Raw() & 0xffff; 178 if (PAWI.Attrs & Attribute::Alignment) 179 FauxAttr |= (1ull<<16)<< 180 (((PAWI.Attrs & Attribute::Alignment).Raw()-1) >> 16); 181 FauxAttr |= (PAWI.Attrs.Raw() & (0x3FFull << 21)) << 11; 182 183 Record.push_back(FauxAttr); 184#endif 185 } 186 187 Stream.EmitRecord(bitc::PARAMATTR_CODE_ENTRY, Record); 188 Record.clear(); 189 } 190 191 Stream.ExitBlock(); 192} 193 194/// WriteTypeTable - Write out the type table for a module. 195static void WriteTypeTable(const llvm_2_9_func::ValueEnumerator &VE, 196 BitstreamWriter &Stream) { 197 const llvm_2_9_func::ValueEnumerator::TypeList &TypeList = VE.getTypes(); 198 199 Stream.EnterSubblock(bitc::TYPE_BLOCK_ID_NEW, 4 /*count from # abbrevs */); 200 SmallVector<uint64_t, 64> TypeVals; 201 202 // Abbrev for TYPE_CODE_POINTER. 203 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 204 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_POINTER)); 205 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 206 Log2_32_Ceil(VE.getTypes().size()+1))); 207 Abbv->Add(BitCodeAbbrevOp(0)); // Addrspace = 0 208 unsigned PtrAbbrev = Stream.EmitAbbrev(Abbv); 209 210 // Abbrev for TYPE_CODE_FUNCTION. 211 Abbv = new BitCodeAbbrev(); 212 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_FUNCTION_OLD)); 213 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isvararg 214 Abbv->Add(BitCodeAbbrevOp(0)); // FIXME: DEAD value, remove in LLVM 3.0 215 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 216 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 217 Log2_32_Ceil(VE.getTypes().size()+1))); 218 unsigned FunctionAbbrev = Stream.EmitAbbrev(Abbv); 219 220 // Abbrev for TYPE_CODE_STRUCT_ANON. 221 Abbv = new BitCodeAbbrev(); 222 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_ANON)); 223 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked 224 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 225 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 226 Log2_32_Ceil(VE.getTypes().size()+1))); 227 unsigned StructAnonAbbrev = Stream.EmitAbbrev(Abbv); 228 229 // Abbrev for TYPE_CODE_STRUCT_NAME. 230 Abbv = new BitCodeAbbrev(); 231 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAME)); 232 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 233 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 234 unsigned StructNameAbbrev = Stream.EmitAbbrev(Abbv); 235 236 // Abbrev for TYPE_CODE_STRUCT_NAMED. 237 Abbv = new BitCodeAbbrev(); 238 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAMED)); 239 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked 240 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 241 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 242 Log2_32_Ceil(VE.getTypes().size()+1))); 243 unsigned StructNamedAbbrev = Stream.EmitAbbrev(Abbv); 244 245 // Abbrev for TYPE_CODE_ARRAY. 246 Abbv = new BitCodeAbbrev(); 247 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_ARRAY)); 248 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // size 249 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 250 Log2_32_Ceil(VE.getTypes().size()+1))); 251 unsigned ArrayAbbrev = Stream.EmitAbbrev(Abbv); 252 253 // Emit an entry count so the reader can reserve space. 254 TypeVals.push_back(TypeList.size()); 255 Stream.EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals); 256 TypeVals.clear(); 257 258 // Loop over all of the types, emitting each in turn. 259 for (unsigned i = 0, e = TypeList.size(); i != e; ++i) { 260 Type *T = TypeList[i]; 261 int AbbrevToUse = 0; 262 unsigned Code = 0; 263 264 switch (T->getTypeID()) { 265 default: llvm_unreachable("Unknown type!"); 266 case Type::VoidTyID: Code = bitc::TYPE_CODE_VOID; break; 267 case Type::FloatTyID: Code = bitc::TYPE_CODE_FLOAT; break; 268 case Type::DoubleTyID: Code = bitc::TYPE_CODE_DOUBLE; break; 269 case Type::X86_FP80TyID: Code = bitc::TYPE_CODE_X86_FP80; break; 270 case Type::FP128TyID: Code = bitc::TYPE_CODE_FP128; break; 271 case Type::PPC_FP128TyID: Code = bitc::TYPE_CODE_PPC_FP128; break; 272 case Type::LabelTyID: Code = bitc::TYPE_CODE_LABEL; break; 273 case Type::MetadataTyID: Code = bitc::TYPE_CODE_METADATA; break; 274 case Type::X86_MMXTyID: Code = bitc::TYPE_CODE_X86_MMX; break; 275 case Type::IntegerTyID: 276 // INTEGER: [width] 277 Code = bitc::TYPE_CODE_INTEGER; 278 TypeVals.push_back(cast<IntegerType>(T)->getBitWidth()); 279 break; 280 case Type::PointerTyID: { 281 PointerType *PTy = cast<PointerType>(T); 282 // POINTER: [pointee type, address space] 283 Code = bitc::TYPE_CODE_POINTER; 284 TypeVals.push_back(VE.getTypeID(PTy->getElementType())); 285 unsigned AddressSpace = PTy->getAddressSpace(); 286 TypeVals.push_back(AddressSpace); 287 if (AddressSpace == 0) AbbrevToUse = PtrAbbrev; 288 break; 289 } 290 case Type::FunctionTyID: { 291 FunctionType *FT = cast<FunctionType>(T); 292 // FUNCTION: [isvararg, attrid, retty, paramty x N] 293 Code = bitc::TYPE_CODE_FUNCTION_OLD; 294 TypeVals.push_back(FT->isVarArg()); 295 TypeVals.push_back(0); // FIXME: DEAD: remove in llvm 3.0 296 TypeVals.push_back(VE.getTypeID(FT->getReturnType())); 297 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) 298 TypeVals.push_back(VE.getTypeID(FT->getParamType(i))); 299 AbbrevToUse = FunctionAbbrev; 300 break; 301 } 302 case Type::StructTyID: { 303 StructType *ST = cast<StructType>(T); 304 // STRUCT: [ispacked, eltty x N] 305 TypeVals.push_back(ST->isPacked()); 306 // Output all of the element types. 307 for (StructType::element_iterator I = ST->element_begin(), 308 E = ST->element_end(); I != E; ++I) 309 TypeVals.push_back(VE.getTypeID(*I)); 310 311 if (ST->isLiteral()) { 312 Code = bitc::TYPE_CODE_STRUCT_ANON; 313 AbbrevToUse = StructAnonAbbrev; 314 } else { 315 if (ST->isOpaque()) { 316 Code = bitc::TYPE_CODE_OPAQUE; 317 } else { 318 Code = bitc::TYPE_CODE_STRUCT_NAMED; 319 AbbrevToUse = StructNamedAbbrev; 320 } 321 322 // Emit the name if it is present. 323 if (!ST->getName().empty()) 324 WriteStringRecord(bitc::TYPE_CODE_STRUCT_NAME, ST->getName(), 325 StructNameAbbrev, Stream); 326 } 327 break; 328 } 329 case Type::ArrayTyID: { 330 ArrayType *AT = cast<ArrayType>(T); 331 // ARRAY: [numelts, eltty] 332 Code = bitc::TYPE_CODE_ARRAY; 333 TypeVals.push_back(AT->getNumElements()); 334 TypeVals.push_back(VE.getTypeID(AT->getElementType())); 335 AbbrevToUse = ArrayAbbrev; 336 break; 337 } 338 case Type::VectorTyID: { 339 VectorType *VT = cast<VectorType>(T); 340 // VECTOR [numelts, eltty] 341 Code = bitc::TYPE_CODE_VECTOR; 342 TypeVals.push_back(VT->getNumElements()); 343 TypeVals.push_back(VE.getTypeID(VT->getElementType())); 344 break; 345 } 346 } 347 348 // Emit the finished record. 349 Stream.EmitRecord(Code, TypeVals, AbbrevToUse); 350 TypeVals.clear(); 351 } 352 353 Stream.ExitBlock(); 354} 355 356static unsigned getEncodedLinkage(const GlobalValue *GV) { 357 switch (GV->getLinkage()) { 358 case GlobalValue::ExternalLinkage: return 0; 359 case GlobalValue::WeakAnyLinkage: return 1; 360 case GlobalValue::AppendingLinkage: return 2; 361 case GlobalValue::InternalLinkage: return 3; 362 case GlobalValue::LinkOnceAnyLinkage: return 4; 363 case GlobalValue::DLLImportLinkage: return 5; 364 case GlobalValue::DLLExportLinkage: return 6; 365 case GlobalValue::ExternalWeakLinkage: return 7; 366 case GlobalValue::CommonLinkage: return 8; 367 case GlobalValue::PrivateLinkage: return 9; 368 case GlobalValue::WeakODRLinkage: return 10; 369 case GlobalValue::LinkOnceODRLinkage: return 11; 370 case GlobalValue::AvailableExternallyLinkage: return 12; 371 case GlobalValue::LinkerPrivateLinkage: return 13; 372 case GlobalValue::LinkerPrivateWeakLinkage: return 14; 373 case GlobalValue::LinkOnceODRAutoHideLinkage: return 15; 374 } 375 llvm_unreachable("Invalid linkage"); 376} 377 378static unsigned getEncodedVisibility(const GlobalValue *GV) { 379 switch (GV->getVisibility()) { 380 default: llvm_unreachable("Invalid visibility!"); 381 case GlobalValue::DefaultVisibility: return 0; 382 case GlobalValue::HiddenVisibility: return 1; 383 case GlobalValue::ProtectedVisibility: return 2; 384 } 385} 386 387// Emit top-level description of module, including target triple, inline asm, 388// descriptors for global variables, and function prototype info. 389static void WriteModuleInfo(const Module *M, 390 const llvm_2_9_func::ValueEnumerator &VE, 391 BitstreamWriter &Stream) { 392 // Emit various pieces of data attached to a module. 393 if (!M->getTargetTriple().empty()) 394 WriteStringRecord(bitc::MODULE_CODE_TRIPLE, M->getTargetTriple(), 395 0/*TODO*/, Stream); 396 if (!M->getDataLayout().empty()) 397 WriteStringRecord(bitc::MODULE_CODE_DATALAYOUT, M->getDataLayout(), 398 0/*TODO*/, Stream); 399 if (!M->getModuleInlineAsm().empty()) 400 WriteStringRecord(bitc::MODULE_CODE_ASM, M->getModuleInlineAsm(), 401 0/*TODO*/, Stream); 402 403 // Emit information about sections and GC, computing how many there are. Also 404 // compute the maximum alignment value. 405 std::map<std::string, unsigned> SectionMap; 406 std::map<std::string, unsigned> GCMap; 407 unsigned MaxAlignment = 0; 408 unsigned MaxGlobalType = 0; 409 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end(); 410 GV != E; ++GV) { 411 MaxAlignment = std::max(MaxAlignment, GV->getAlignment()); 412 MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV->getType())); 413 414 if (!GV->hasSection()) continue; 415 // Give section names unique ID's. 416 unsigned &Entry = SectionMap[GV->getSection()]; 417 if (Entry != 0) continue; 418 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, GV->getSection(), 419 0/*TODO*/, Stream); 420 Entry = SectionMap.size(); 421 } 422 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) { 423 MaxAlignment = std::max(MaxAlignment, F->getAlignment()); 424 if (F->hasSection()) { 425 // Give section names unique ID's. 426 unsigned &Entry = SectionMap[F->getSection()]; 427 if (!Entry) { 428 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, F->getSection(), 429 0/*TODO*/, Stream); 430 Entry = SectionMap.size(); 431 } 432 } 433 if (F->hasGC()) { 434 // Same for GC names. 435 unsigned &Entry = GCMap[F->getGC()]; 436 if (!Entry) { 437 WriteStringRecord(bitc::MODULE_CODE_GCNAME, F->getGC(), 438 0/*TODO*/, Stream); 439 Entry = GCMap.size(); 440 } 441 } 442 } 443 444 // Emit abbrev for globals, now that we know # sections and max alignment. 445 unsigned SimpleGVarAbbrev = 0; 446 if (!M->global_empty()) { 447 // Add an abbrev for common globals with no visibility or thread localness. 448 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 449 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR)); 450 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 451 Log2_32_Ceil(MaxGlobalType+1))); 452 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constant. 453 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer. 454 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // Linkage. 455 if (MaxAlignment == 0) // Alignment. 456 Abbv->Add(BitCodeAbbrevOp(0)); 457 else { 458 unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1; 459 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 460 Log2_32_Ceil(MaxEncAlignment+1))); 461 } 462 if (SectionMap.empty()) // Section. 463 Abbv->Add(BitCodeAbbrevOp(0)); 464 else 465 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 466 Log2_32_Ceil(SectionMap.size()+1))); 467 // Don't bother emitting vis + thread local. 468 SimpleGVarAbbrev = Stream.EmitAbbrev(Abbv); 469 } 470 471 // Emit the global variable information. 472 SmallVector<unsigned, 64> Vals; 473 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end(); 474 GV != E; ++GV) { 475 unsigned AbbrevToUse = 0; 476 477 // GLOBALVAR: [type, isconst, initid, 478 // linkage, alignment, section, visibility, threadlocal, 479 // unnamed_addr] 480 Vals.push_back(VE.getTypeID(GV->getType())); 481 Vals.push_back(GV->isConstant()); 482 Vals.push_back(GV->isDeclaration() ? 0 : 483 (VE.getValueID(GV->getInitializer()) + 1)); 484 Vals.push_back(getEncodedLinkage(GV)); 485 Vals.push_back(Log2_32(GV->getAlignment())+1); 486 Vals.push_back(GV->hasSection() ? SectionMap[GV->getSection()] : 0); 487 if (GV->isThreadLocal() || 488 GV->getVisibility() != GlobalValue::DefaultVisibility || 489 GV->hasUnnamedAddr()) { 490 Vals.push_back(getEncodedVisibility(GV)); 491 Vals.push_back(GV->isThreadLocal()); 492 Vals.push_back(GV->hasUnnamedAddr()); 493 } else { 494 AbbrevToUse = SimpleGVarAbbrev; 495 } 496 497 Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse); 498 Vals.clear(); 499 } 500 501 // Emit the function proto information. 502 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) { 503 // FUNCTION: [type, callingconv, isproto, paramattr, 504 // linkage, alignment, section, visibility, gc, unnamed_addr] 505 Vals.push_back(VE.getTypeID(F->getType())); 506 Vals.push_back(F->getCallingConv()); 507 Vals.push_back(F->isDeclaration()); 508 Vals.push_back(getEncodedLinkage(F)); 509 Vals.push_back(VE.getAttributeID(F->getAttributes())); 510 Vals.push_back(Log2_32(F->getAlignment())+1); 511 Vals.push_back(F->hasSection() ? SectionMap[F->getSection()] : 0); 512 Vals.push_back(getEncodedVisibility(F)); 513 Vals.push_back(F->hasGC() ? GCMap[F->getGC()] : 0); 514 Vals.push_back(F->hasUnnamedAddr()); 515 516 unsigned AbbrevToUse = 0; 517 Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse); 518 Vals.clear(); 519 } 520 521 // Emit the alias information. 522 for (Module::const_alias_iterator AI = M->alias_begin(), E = M->alias_end(); 523 AI != E; ++AI) { 524 Vals.push_back(VE.getTypeID(AI->getType())); 525 Vals.push_back(VE.getValueID(AI->getAliasee())); 526 Vals.push_back(getEncodedLinkage(AI)); 527 Vals.push_back(getEncodedVisibility(AI)); 528 unsigned AbbrevToUse = 0; 529 Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse); 530 Vals.clear(); 531 } 532} 533 534static uint64_t GetOptimizationFlags(const Value *V) { 535 uint64_t Flags = 0; 536 537 if (const OverflowingBinaryOperator *OBO = 538 dyn_cast<OverflowingBinaryOperator>(V)) { 539 if (OBO->hasNoSignedWrap()) 540 Flags |= 1 << bitc::OBO_NO_SIGNED_WRAP; 541 if (OBO->hasNoUnsignedWrap()) 542 Flags |= 1 << bitc::OBO_NO_UNSIGNED_WRAP; 543 } else if (const PossiblyExactOperator *PEO = 544 dyn_cast<PossiblyExactOperator>(V)) { 545 if (PEO->isExact()) 546 Flags |= 1 << bitc::PEO_EXACT; 547 } 548 549 return Flags; 550} 551 552static void WriteMDNode(const MDNode *N, 553 const llvm_2_9_func::ValueEnumerator &VE, 554 BitstreamWriter &Stream, 555 SmallVector<uint64_t, 64> &Record) { 556 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) { 557 if (N->getOperand(i)) { 558 Record.push_back(VE.getTypeID(N->getOperand(i)->getType())); 559 Record.push_back(VE.getValueID(N->getOperand(i))); 560 } else { 561 Record.push_back(VE.getTypeID(Type::getVoidTy(N->getContext()))); 562 Record.push_back(0); 563 } 564 } 565 unsigned MDCode = N->isFunctionLocal() ? bitc::METADATA_FN_NODE : 566 bitc::METADATA_NODE; 567 Stream.EmitRecord(MDCode, Record, 0); 568 Record.clear(); 569} 570 571static void WriteModuleMetadata(const Module *M, 572 const llvm_2_9_func::ValueEnumerator &VE, 573 BitstreamWriter &Stream) { 574 const llvm_2_9_func::ValueEnumerator::ValueList &Vals = VE.getMDValues(); 575 bool StartedMetadataBlock = false; 576 unsigned MDSAbbrev = 0; 577 SmallVector<uint64_t, 64> Record; 578 for (unsigned i = 0, e = Vals.size(); i != e; ++i) { 579 580 if (const MDNode *N = dyn_cast<MDNode>(Vals[i].first)) { 581 if (!N->isFunctionLocal() || !N->getFunction()) { 582 if (!StartedMetadataBlock) { 583 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 584 StartedMetadataBlock = true; 585 } 586 WriteMDNode(N, VE, Stream, Record); 587 } 588 } else if (const MDString *MDS = dyn_cast<MDString>(Vals[i].first)) { 589 if (!StartedMetadataBlock) { 590 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 591 592 // Abbrev for METADATA_STRING. 593 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 594 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_STRING)); 595 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 596 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 597 MDSAbbrev = Stream.EmitAbbrev(Abbv); 598 StartedMetadataBlock = true; 599 } 600 601 // Code: [strchar x N] 602 Record.append(MDS->begin(), MDS->end()); 603 604 // Emit the finished record. 605 Stream.EmitRecord(bitc::METADATA_STRING, Record, MDSAbbrev); 606 Record.clear(); 607 } 608 } 609 610 // Write named metadata. 611 for (Module::const_named_metadata_iterator I = M->named_metadata_begin(), 612 E = M->named_metadata_end(); I != E; ++I) { 613 const NamedMDNode *NMD = I; 614 if (!StartedMetadataBlock) { 615 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 616 StartedMetadataBlock = true; 617 } 618 619 // Write name. 620 StringRef Str = NMD->getName(); 621 for (unsigned i = 0, e = Str.size(); i != e; ++i) 622 Record.push_back(Str[i]); 623 Stream.EmitRecord(bitc::METADATA_NAME, Record, 0/*TODO*/); 624 Record.clear(); 625 626 // Write named metadata operands. 627 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) 628 Record.push_back(VE.getValueID(NMD->getOperand(i))); 629 Stream.EmitRecord(bitc::METADATA_NAMED_NODE, Record, 0); 630 Record.clear(); 631 } 632 633 if (StartedMetadataBlock) 634 Stream.ExitBlock(); 635} 636 637static void WriteFunctionLocalMetadata(const Function &F, 638 const llvm_2_9_func::ValueEnumerator &VE, 639 BitstreamWriter &Stream) { 640 bool StartedMetadataBlock = false; 641 SmallVector<uint64_t, 64> Record; 642 const SmallVector<const MDNode *, 8> &Vals = VE.getFunctionLocalMDValues(); 643 for (unsigned i = 0, e = Vals.size(); i != e; ++i) 644 if (const MDNode *N = Vals[i]) 645 if (N->isFunctionLocal() && N->getFunction() == &F) { 646 if (!StartedMetadataBlock) { 647 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 648 StartedMetadataBlock = true; 649 } 650 WriteMDNode(N, VE, Stream, Record); 651 } 652 653 if (StartedMetadataBlock) 654 Stream.ExitBlock(); 655} 656 657static void WriteMetadataAttachment(const Function &F, 658 const llvm_2_9_func::ValueEnumerator &VE, 659 BitstreamWriter &Stream) { 660 Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3); 661 662 SmallVector<uint64_t, 64> Record; 663 664 // Write metadata attachments 665 // METADATA_ATTACHMENT - [m x [value, [n x [id, mdnode]]] 666 SmallVector<std::pair<unsigned, MDNode*>, 4> MDs; 667 668 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) 669 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); 670 I != E; ++I) { 671 MDs.clear(); 672 I->getAllMetadataOtherThanDebugLoc(MDs); 673 674 // If no metadata, ignore instruction. 675 if (MDs.empty()) continue; 676 677 Record.push_back(VE.getInstructionID(I)); 678 679 for (unsigned i = 0, e = MDs.size(); i != e; ++i) { 680 Record.push_back(MDs[i].first); 681 Record.push_back(VE.getValueID(MDs[i].second)); 682 } 683 Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0); 684 Record.clear(); 685 } 686 687 Stream.ExitBlock(); 688} 689 690static void WriteModuleMetadataStore(const Module *M, BitstreamWriter &Stream) { 691 SmallVector<uint64_t, 64> Record; 692 693 // Write metadata kinds 694 // METADATA_KIND - [n x [id, name]] 695 SmallVector<StringRef, 4> Names; 696 M->getMDKindNames(Names); 697 698 if (Names.empty()) return; 699 700 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 701 702 for (unsigned MDKindID = 0, e = Names.size(); MDKindID != e; ++MDKindID) { 703 Record.push_back(MDKindID); 704 StringRef KName = Names[MDKindID]; 705 Record.append(KName.begin(), KName.end()); 706 707 Stream.EmitRecord(bitc::METADATA_KIND, Record, 0); 708 Record.clear(); 709 } 710 711 Stream.ExitBlock(); 712} 713 714static void WriteConstants(unsigned FirstVal, unsigned LastVal, 715 const llvm_2_9_func::ValueEnumerator &VE, 716 BitstreamWriter &Stream, bool isGlobal) { 717 if (FirstVal == LastVal) return; 718 719 Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4); 720 721 unsigned AggregateAbbrev = 0; 722 unsigned String8Abbrev = 0; 723 unsigned CString7Abbrev = 0; 724 unsigned CString6Abbrev = 0; 725 // If this is a constant pool for the module, emit module-specific abbrevs. 726 if (isGlobal) { 727 // Abbrev for CST_CODE_AGGREGATE. 728 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 729 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE)); 730 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 731 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1))); 732 AggregateAbbrev = Stream.EmitAbbrev(Abbv); 733 734 // Abbrev for CST_CODE_STRING. 735 Abbv = new BitCodeAbbrev(); 736 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING)); 737 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 738 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 739 String8Abbrev = Stream.EmitAbbrev(Abbv); 740 // Abbrev for CST_CODE_CSTRING. 741 Abbv = new BitCodeAbbrev(); 742 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING)); 743 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 744 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 745 CString7Abbrev = Stream.EmitAbbrev(Abbv); 746 // Abbrev for CST_CODE_CSTRING. 747 Abbv = new BitCodeAbbrev(); 748 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING)); 749 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 750 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 751 CString6Abbrev = Stream.EmitAbbrev(Abbv); 752 } 753 754 SmallVector<uint64_t, 64> Record; 755 756 const llvm_2_9_func::ValueEnumerator::ValueList &Vals = VE.getValues(); 757 Type *LastTy = 0; 758 for (unsigned i = FirstVal; i != LastVal; ++i) { 759 const Value *V = Vals[i].first; 760 // If we need to switch types, do so now. 761 if (V->getType() != LastTy) { 762 LastTy = V->getType(); 763 Record.push_back(VE.getTypeID(LastTy)); 764 Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record, 765 CONSTANTS_SETTYPE_ABBREV); 766 Record.clear(); 767 } 768 769 if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) { 770 Record.push_back(unsigned(IA->hasSideEffects()) | 771 unsigned(IA->isAlignStack()) << 1); 772 773 // Add the asm string. 774 const std::string &AsmStr = IA->getAsmString(); 775 Record.push_back(AsmStr.size()); 776 for (unsigned i = 0, e = AsmStr.size(); i != e; ++i) 777 Record.push_back(AsmStr[i]); 778 779 // Add the constraint string. 780 const std::string &ConstraintStr = IA->getConstraintString(); 781 Record.push_back(ConstraintStr.size()); 782 for (unsigned i = 0, e = ConstraintStr.size(); i != e; ++i) 783 Record.push_back(ConstraintStr[i]); 784 Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record); 785 Record.clear(); 786 continue; 787 } 788 const Constant *C = cast<Constant>(V); 789 unsigned Code = -1U; 790 unsigned AbbrevToUse = 0; 791 if (C->isNullValue()) { 792 Code = bitc::CST_CODE_NULL; 793 } else if (isa<UndefValue>(C)) { 794 Code = bitc::CST_CODE_UNDEF; 795 } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) { 796 if (IV->getBitWidth() <= 64) { 797 uint64_t V = IV->getSExtValue(); 798 if ((int64_t)V >= 0) 799 Record.push_back(V << 1); 800 else 801 Record.push_back((-V << 1) | 1); 802 Code = bitc::CST_CODE_INTEGER; 803 AbbrevToUse = CONSTANTS_INTEGER_ABBREV; 804 } else { // Wide integers, > 64 bits in size. 805 // We have an arbitrary precision integer value to write whose 806 // bit width is > 64. However, in canonical unsigned integer 807 // format it is likely that the high bits are going to be zero. 808 // So, we only write the number of active words. 809 unsigned NWords = IV->getValue().getActiveWords(); 810 const uint64_t *RawWords = IV->getValue().getRawData(); 811 for (unsigned i = 0; i != NWords; ++i) { 812 int64_t V = RawWords[i]; 813 if (V >= 0) 814 Record.push_back(V << 1); 815 else 816 Record.push_back((-V << 1) | 1); 817 } 818 Code = bitc::CST_CODE_WIDE_INTEGER; 819 } 820 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) { 821 Code = bitc::CST_CODE_FLOAT; 822 Type *Ty = CFP->getType(); 823 if (Ty->isFloatTy() || Ty->isDoubleTy()) { 824 Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue()); 825 } else if (Ty->isX86_FP80Ty()) { 826 // api needed to prevent premature destruction 827 // bits are not in the same order as a normal i80 APInt, compensate. 828 APInt api = CFP->getValueAPF().bitcastToAPInt(); 829 const uint64_t *p = api.getRawData(); 830 Record.push_back((p[1] << 48) | (p[0] >> 16)); 831 Record.push_back(p[0] & 0xffffLL); 832 } else if (Ty->isFP128Ty() || Ty->isPPC_FP128Ty()) { 833 APInt api = CFP->getValueAPF().bitcastToAPInt(); 834 const uint64_t *p = api.getRawData(); 835 Record.push_back(p[0]); 836 Record.push_back(p[1]); 837 } else { 838 assert (0 && "Unknown FP type!"); 839 } 840 } else if (isa<ConstantDataSequential>(C) && 841 cast<ConstantDataSequential>(C)->isString()) { 842 const ConstantDataSequential *Str = cast<ConstantDataSequential>(C); 843 // Emit constant strings specially. 844 unsigned NumElts = Str->getNumElements(); 845 // If this is a null-terminated string, use the denser CSTRING encoding. 846 if (Str->isCString()) { 847 Code = bitc::CST_CODE_CSTRING; 848 --NumElts; // Don't encode the null, which isn't allowed by char6. 849 } else { 850 Code = bitc::CST_CODE_STRING; 851 AbbrevToUse = String8Abbrev; 852 } 853 bool isCStr7 = Code == bitc::CST_CODE_CSTRING; 854 bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING; 855 for (unsigned i = 0; i != NumElts; ++i) { 856 unsigned char V = Str->getElementAsInteger(i); 857 Record.push_back(V); 858 isCStr7 &= (V & 128) == 0; 859 if (isCStrChar6) 860 isCStrChar6 = BitCodeAbbrevOp::isChar6(V); 861 } 862 863 if (isCStrChar6) 864 AbbrevToUse = CString6Abbrev; 865 else if (isCStr7) 866 AbbrevToUse = CString7Abbrev; 867 } else if (const ConstantDataSequential *CDS = 868 dyn_cast<ConstantDataSequential>(C)) { 869 // We must replace ConstantDataSequential's representation with the 870 // legacy ConstantArray/ConstantVector/ConstantStruct version. 871 // ValueEnumerator is similarly modified to mark the appropriate 872 // Constants as used (so they are emitted). 873 Code = bitc::CST_CODE_AGGREGATE; 874 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) 875 Record.push_back(VE.getValueID(CDS->getElementAsConstant(i))); 876 AbbrevToUse = AggregateAbbrev; 877 } else if (isa<ConstantArray>(C) || isa<ConstantStruct>(C) || 878 isa<ConstantVector>(C)) { 879 Code = bitc::CST_CODE_AGGREGATE; 880 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i) 881 Record.push_back(VE.getValueID(C->getOperand(i))); 882 AbbrevToUse = AggregateAbbrev; 883 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) { 884 switch (CE->getOpcode()) { 885 default: 886 if (Instruction::isCast(CE->getOpcode())) { 887 Code = bitc::CST_CODE_CE_CAST; 888 Record.push_back(GetEncodedCastOpcode(CE->getOpcode())); 889 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 890 Record.push_back(VE.getValueID(C->getOperand(0))); 891 AbbrevToUse = CONSTANTS_CE_CAST_Abbrev; 892 } else { 893 assert(CE->getNumOperands() == 2 && "Unknown constant expr!"); 894 Code = bitc::CST_CODE_CE_BINOP; 895 Record.push_back(GetEncodedBinaryOpcode(CE->getOpcode())); 896 Record.push_back(VE.getValueID(C->getOperand(0))); 897 Record.push_back(VE.getValueID(C->getOperand(1))); 898 uint64_t Flags = GetOptimizationFlags(CE); 899 if (Flags != 0) 900 Record.push_back(Flags); 901 } 902 break; 903 case Instruction::GetElementPtr: 904 Code = bitc::CST_CODE_CE_GEP; 905 if (cast<GEPOperator>(C)->isInBounds()) 906 Code = bitc::CST_CODE_CE_INBOUNDS_GEP; 907 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) { 908 Record.push_back(VE.getTypeID(C->getOperand(i)->getType())); 909 Record.push_back(VE.getValueID(C->getOperand(i))); 910 } 911 break; 912 case Instruction::Select: 913 Code = bitc::CST_CODE_CE_SELECT; 914 Record.push_back(VE.getValueID(C->getOperand(0))); 915 Record.push_back(VE.getValueID(C->getOperand(1))); 916 Record.push_back(VE.getValueID(C->getOperand(2))); 917 break; 918 case Instruction::ExtractElement: 919 Code = bitc::CST_CODE_CE_EXTRACTELT; 920 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 921 Record.push_back(VE.getValueID(C->getOperand(0))); 922 Record.push_back(VE.getValueID(C->getOperand(1))); 923 break; 924 case Instruction::InsertElement: 925 Code = bitc::CST_CODE_CE_INSERTELT; 926 Record.push_back(VE.getValueID(C->getOperand(0))); 927 Record.push_back(VE.getValueID(C->getOperand(1))); 928 Record.push_back(VE.getValueID(C->getOperand(2))); 929 break; 930 case Instruction::ShuffleVector: 931 // If the return type and argument types are the same, this is a 932 // standard shufflevector instruction. If the types are different, 933 // then the shuffle is widening or truncating the input vectors, and 934 // the argument type must also be encoded. 935 if (C->getType() == C->getOperand(0)->getType()) { 936 Code = bitc::CST_CODE_CE_SHUFFLEVEC; 937 } else { 938 Code = bitc::CST_CODE_CE_SHUFVEC_EX; 939 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 940 } 941 Record.push_back(VE.getValueID(C->getOperand(0))); 942 Record.push_back(VE.getValueID(C->getOperand(1))); 943 Record.push_back(VE.getValueID(C->getOperand(2))); 944 break; 945 case Instruction::ICmp: 946 case Instruction::FCmp: 947 Code = bitc::CST_CODE_CE_CMP; 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 Record.push_back(CE->getPredicate()); 952 break; 953 } 954 } else if (const BlockAddress *BA = dyn_cast<BlockAddress>(C)) { 955 Code = bitc::CST_CODE_BLOCKADDRESS; 956 Record.push_back(VE.getTypeID(BA->getFunction()->getType())); 957 Record.push_back(VE.getValueID(BA->getFunction())); 958 Record.push_back(VE.getGlobalBasicBlockID(BA->getBasicBlock())); 959 } else { 960#ifndef NDEBUG 961 C->dump(); 962#endif 963 llvm_unreachable("Unknown constant!"); 964 } 965 Stream.EmitRecord(Code, Record, AbbrevToUse); 966 Record.clear(); 967 } 968 969 Stream.ExitBlock(); 970} 971 972static void WriteModuleConstants(const llvm_2_9_func::ValueEnumerator &VE, 973 BitstreamWriter &Stream) { 974 const llvm_2_9_func::ValueEnumerator::ValueList &Vals = VE.getValues(); 975 976 // Find the first constant to emit, which is the first non-globalvalue value. 977 // We know globalvalues have been emitted by WriteModuleInfo. 978 for (unsigned i = 0, e = Vals.size(); i != e; ++i) { 979 if (!isa<GlobalValue>(Vals[i].first)) { 980 WriteConstants(i, Vals.size(), VE, Stream, true); 981 return; 982 } 983 } 984} 985 986/// PushValueAndType - The file has to encode both the value and type id for 987/// many values, because we need to know what type to create for forward 988/// references. However, most operands are not forward references, so this type 989/// field is not needed. 990/// 991/// This function adds V's value ID to Vals. If the value ID is higher than the 992/// instruction ID, then it is a forward reference, and it also includes the 993/// type ID. 994static bool PushValueAndType(const Value *V, unsigned InstID, 995 SmallVector<unsigned, 64> &Vals, 996 llvm_2_9_func::ValueEnumerator &VE) { 997 unsigned ValID = VE.getValueID(V); 998 Vals.push_back(ValID); 999 if (ValID >= InstID) { 1000 Vals.push_back(VE.getTypeID(V->getType())); 1001 return true; 1002 } 1003 return false; 1004} 1005 1006/// WriteInstruction - Emit an instruction to the specified stream. 1007static void WriteInstruction(const Instruction &I, unsigned InstID, 1008 llvm_2_9_func::ValueEnumerator &VE, 1009 BitstreamWriter &Stream, 1010 SmallVector<unsigned, 64> &Vals) { 1011 unsigned Code = 0; 1012 unsigned AbbrevToUse = 0; 1013 VE.setInstructionID(&I); 1014 switch (I.getOpcode()) { 1015 default: 1016 if (Instruction::isCast(I.getOpcode())) { 1017 Code = bitc::FUNC_CODE_INST_CAST; 1018 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 1019 AbbrevToUse = FUNCTION_INST_CAST_ABBREV; 1020 Vals.push_back(VE.getTypeID(I.getType())); 1021 Vals.push_back(GetEncodedCastOpcode(I.getOpcode())); 1022 } else { 1023 assert(isa<BinaryOperator>(I) && "Unknown instruction!"); 1024 Code = bitc::FUNC_CODE_INST_BINOP; 1025 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 1026 AbbrevToUse = FUNCTION_INST_BINOP_ABBREV; 1027 Vals.push_back(VE.getValueID(I.getOperand(1))); 1028 Vals.push_back(GetEncodedBinaryOpcode(I.getOpcode())); 1029 uint64_t Flags = GetOptimizationFlags(&I); 1030 if (Flags != 0) { 1031 if (AbbrevToUse == FUNCTION_INST_BINOP_ABBREV) 1032 AbbrevToUse = FUNCTION_INST_BINOP_FLAGS_ABBREV; 1033 Vals.push_back(Flags); 1034 } 1035 } 1036 break; 1037 1038 case Instruction::GetElementPtr: 1039 Code = bitc::FUNC_CODE_INST_GEP; 1040 if (cast<GEPOperator>(&I)->isInBounds()) 1041 Code = bitc::FUNC_CODE_INST_INBOUNDS_GEP; 1042 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 1043 PushValueAndType(I.getOperand(i), InstID, Vals, VE); 1044 break; 1045 case Instruction::ExtractValue: { 1046 Code = bitc::FUNC_CODE_INST_EXTRACTVAL; 1047 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1048 const ExtractValueInst *EVI = cast<ExtractValueInst>(&I); 1049 for (const unsigned *i = EVI->idx_begin(), *e = EVI->idx_end(); i != e; ++i) 1050 Vals.push_back(*i); 1051 break; 1052 } 1053 case Instruction::InsertValue: { 1054 Code = bitc::FUNC_CODE_INST_INSERTVAL; 1055 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1056 PushValueAndType(I.getOperand(1), InstID, Vals, VE); 1057 const InsertValueInst *IVI = cast<InsertValueInst>(&I); 1058 for (const unsigned *i = IVI->idx_begin(), *e = IVI->idx_end(); i != e; ++i) 1059 Vals.push_back(*i); 1060 break; 1061 } 1062 case Instruction::Select: 1063 Code = bitc::FUNC_CODE_INST_VSELECT; 1064 PushValueAndType(I.getOperand(1), InstID, Vals, VE); 1065 Vals.push_back(VE.getValueID(I.getOperand(2))); 1066 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1067 break; 1068 case Instruction::ExtractElement: 1069 Code = bitc::FUNC_CODE_INST_EXTRACTELT; 1070 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1071 Vals.push_back(VE.getValueID(I.getOperand(1))); 1072 break; 1073 case Instruction::InsertElement: 1074 Code = bitc::FUNC_CODE_INST_INSERTELT; 1075 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1076 Vals.push_back(VE.getValueID(I.getOperand(1))); 1077 Vals.push_back(VE.getValueID(I.getOperand(2))); 1078 break; 1079 case Instruction::ShuffleVector: 1080 Code = bitc::FUNC_CODE_INST_SHUFFLEVEC; 1081 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1082 Vals.push_back(VE.getValueID(I.getOperand(1))); 1083 Vals.push_back(VE.getValueID(I.getOperand(2))); 1084 break; 1085 case Instruction::ICmp: 1086 case Instruction::FCmp: 1087 // compare returning Int1Ty or vector of Int1Ty 1088 Code = bitc::FUNC_CODE_INST_CMP2; 1089 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1090 Vals.push_back(VE.getValueID(I.getOperand(1))); 1091 Vals.push_back(cast<CmpInst>(I).getPredicate()); 1092 break; 1093 1094 case Instruction::Ret: 1095 { 1096 Code = bitc::FUNC_CODE_INST_RET; 1097 unsigned NumOperands = I.getNumOperands(); 1098 if (NumOperands == 0) 1099 AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV; 1100 else if (NumOperands == 1) { 1101 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 1102 AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV; 1103 } else { 1104 for (unsigned i = 0, e = NumOperands; i != e; ++i) 1105 PushValueAndType(I.getOperand(i), InstID, Vals, VE); 1106 } 1107 } 1108 break; 1109 case Instruction::Br: 1110 { 1111 Code = bitc::FUNC_CODE_INST_BR; 1112 BranchInst &II = cast<BranchInst>(I); 1113 Vals.push_back(VE.getValueID(II.getSuccessor(0))); 1114 if (II.isConditional()) { 1115 Vals.push_back(VE.getValueID(II.getSuccessor(1))); 1116 Vals.push_back(VE.getValueID(II.getCondition())); 1117 } 1118 } 1119 break; 1120 case Instruction::Switch: 1121 { 1122 Code = bitc::FUNC_CODE_INST_SWITCH; 1123 SwitchInst &SI = cast<SwitchInst>(I); 1124 1125 Vals.push_back(VE.getTypeID(SI.getCondition()->getType())); 1126 Vals.push_back(VE.getValueID(SI.getCondition())); 1127 Vals.push_back(VE.getValueID(SI.getDefaultDest())); 1128 for (SwitchInst::CaseIt i = SI.case_begin(), e = SI.case_end(); 1129 i != e; ++i) { 1130 IntegersSubset& CaseRanges = i.getCaseValueEx(); 1131 1132 if (CaseRanges.isSingleNumber()) { 1133 Vals.push_back(VE.getValueID(CaseRanges.getSingleNumber(0).toConstantInt())); 1134 Vals.push_back(VE.getValueID(i.getCaseSuccessor())); 1135 } else if (CaseRanges.isSingleNumbersOnly()) { 1136 for (unsigned ri = 0, rn = CaseRanges.getNumItems(); 1137 ri != rn; ++ri) { 1138 Vals.push_back(VE.getValueID(CaseRanges.getSingleNumber(ri).toConstantInt())); 1139 Vals.push_back(VE.getValueID(i.getCaseSuccessor())); 1140 } 1141 } else { 1142 llvm_unreachable("Not single number?"); 1143 } 1144 } 1145 } 1146 break; 1147 case Instruction::IndirectBr: 1148 Code = bitc::FUNC_CODE_INST_INDIRECTBR; 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 1154 case Instruction::Invoke: { 1155 const InvokeInst *II = cast<InvokeInst>(&I); 1156 const Value *Callee(II->getCalledValue()); 1157 PointerType *PTy = cast<PointerType>(Callee->getType()); 1158 FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 1159 Code = bitc::FUNC_CODE_INST_INVOKE; 1160 1161 Vals.push_back(VE.getAttributeID(II->getAttributes())); 1162 Vals.push_back(II->getCallingConv()); 1163 Vals.push_back(VE.getValueID(II->getNormalDest())); 1164 Vals.push_back(VE.getValueID(II->getUnwindDest())); 1165 PushValueAndType(Callee, InstID, Vals, VE); 1166 1167 // Emit value #'s for the fixed parameters. 1168 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) 1169 Vals.push_back(VE.getValueID(I.getOperand(i))); // fixed param. 1170 1171 // Emit type/value pairs for varargs params. 1172 if (FTy->isVarArg()) { 1173 for (unsigned i = FTy->getNumParams(), e = I.getNumOperands()-3; 1174 i != e; ++i) 1175 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // vararg 1176 } 1177 break; 1178 } 1179 case Instruction::Resume: 1180 Code = bitc::FUNC_CODE_INST_RESUME; 1181 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1182 break; 1183 case Instruction::Unreachable: 1184 Code = bitc::FUNC_CODE_INST_UNREACHABLE; 1185 AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV; 1186 break; 1187 1188 case Instruction::PHI: { 1189 const PHINode &PN = cast<PHINode>(I); 1190 Code = bitc::FUNC_CODE_INST_PHI; 1191 Vals.push_back(VE.getTypeID(PN.getType())); 1192 for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i) { 1193 Vals.push_back(VE.getValueID(PN.getIncomingValue(i))); 1194 Vals.push_back(VE.getValueID(PN.getIncomingBlock(i))); 1195 } 1196 break; 1197 } 1198 1199 case Instruction::LandingPad: { 1200 const LandingPadInst &LP = cast<LandingPadInst>(I); 1201 Code = bitc::FUNC_CODE_INST_LANDINGPAD; 1202 Vals.push_back(VE.getTypeID(LP.getType())); 1203 PushValueAndType(LP.getPersonalityFn(), InstID, Vals, VE); 1204 Vals.push_back(LP.isCleanup()); 1205 Vals.push_back(LP.getNumClauses()); 1206 for (unsigned I = 0, E = LP.getNumClauses(); I != E; ++I) { 1207 if (LP.isCatch(I)) 1208 Vals.push_back(LandingPadInst::Catch); 1209 else 1210 Vals.push_back(LandingPadInst::Filter); 1211 PushValueAndType(LP.getClause(I), InstID, Vals, VE); 1212 } 1213 break; 1214 } 1215 1216 case Instruction::Alloca: 1217 Code = bitc::FUNC_CODE_INST_ALLOCA; 1218 Vals.push_back(VE.getTypeID(I.getType())); 1219 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 1220 Vals.push_back(VE.getValueID(I.getOperand(0))); // size. 1221 Vals.push_back(Log2_32(cast<AllocaInst>(I).getAlignment())+1); 1222 break; 1223 1224 case Instruction::Load: 1225 if (cast<LoadInst>(I).isAtomic()) { 1226 Code = bitc::FUNC_CODE_INST_LOADATOMIC; 1227 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1228 } else { 1229 Code = bitc::FUNC_CODE_INST_LOAD; 1230 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) // ptr 1231 AbbrevToUse = FUNCTION_INST_LOAD_ABBREV; 1232 } 1233 Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1); 1234 Vals.push_back(cast<LoadInst>(I).isVolatile()); 1235 if (cast<LoadInst>(I).isAtomic()) { 1236 Vals.push_back(GetEncodedOrdering(cast<LoadInst>(I).getOrdering())); 1237 Vals.push_back(GetEncodedSynchScope(cast<LoadInst>(I).getSynchScope())); 1238 } 1239 break; 1240 case Instruction::Store: 1241 if (cast<StoreInst>(I).isAtomic()) 1242 Code = bitc::FUNC_CODE_INST_STOREATOMIC; 1243 else 1244 Code = bitc::FUNC_CODE_INST_STORE; 1245 PushValueAndType(I.getOperand(1), InstID, Vals, VE); // ptrty + ptr 1246 Vals.push_back(VE.getValueID(I.getOperand(0))); // val. 1247 Vals.push_back(Log2_32(cast<StoreInst>(I).getAlignment())+1); 1248 Vals.push_back(cast<StoreInst>(I).isVolatile()); 1249 if (cast<StoreInst>(I).isAtomic()) { 1250 Vals.push_back(GetEncodedOrdering(cast<StoreInst>(I).getOrdering())); 1251 Vals.push_back(GetEncodedSynchScope(cast<StoreInst>(I).getSynchScope())); 1252 } 1253 break; 1254 case Instruction::AtomicCmpXchg: 1255 Code = bitc::FUNC_CODE_INST_CMPXCHG; 1256 PushValueAndType(I.getOperand(0), InstID, Vals, VE); // ptrty + ptr 1257 Vals.push_back(VE.getValueID(I.getOperand(1))); // cmp. 1258 Vals.push_back(VE.getValueID(I.getOperand(2))); // newval. 1259 Vals.push_back(cast<AtomicCmpXchgInst>(I).isVolatile()); 1260 Vals.push_back(GetEncodedOrdering( 1261 cast<AtomicCmpXchgInst>(I).getOrdering())); 1262 Vals.push_back(GetEncodedSynchScope( 1263 cast<AtomicCmpXchgInst>(I).getSynchScope())); 1264 break; 1265 case Instruction::AtomicRMW: 1266 Code = bitc::FUNC_CODE_INST_ATOMICRMW; 1267 PushValueAndType(I.getOperand(0), InstID, Vals, VE); // ptrty + ptr 1268 Vals.push_back(VE.getValueID(I.getOperand(1))); // val. 1269 Vals.push_back(GetEncodedRMWOperation( 1270 cast<AtomicRMWInst>(I).getOperation())); 1271 Vals.push_back(cast<AtomicRMWInst>(I).isVolatile()); 1272 Vals.push_back(GetEncodedOrdering(cast<AtomicRMWInst>(I).getOrdering())); 1273 Vals.push_back(GetEncodedSynchScope( 1274 cast<AtomicRMWInst>(I).getSynchScope())); 1275 break; 1276 case Instruction::Fence: 1277 Code = bitc::FUNC_CODE_INST_FENCE; 1278 Vals.push_back(GetEncodedOrdering(cast<FenceInst>(I).getOrdering())); 1279 Vals.push_back(GetEncodedSynchScope(cast<FenceInst>(I).getSynchScope())); 1280 break; 1281 case Instruction::Call: { 1282 const CallInst &CI = cast<CallInst>(I); 1283 PointerType *PTy = cast<PointerType>(CI.getCalledValue()->getType()); 1284 FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 1285 1286 Code = bitc::FUNC_CODE_INST_CALL; 1287 1288 Vals.push_back(VE.getAttributeID(CI.getAttributes())); 1289 Vals.push_back((CI.getCallingConv() << 1) | unsigned(CI.isTailCall())); 1290 PushValueAndType(CI.getCalledValue(), InstID, Vals, VE); // Callee 1291 1292 // Emit value #'s for the fixed parameters. 1293 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) 1294 Vals.push_back(VE.getValueID(CI.getArgOperand(i))); // fixed param. 1295 1296 // Emit type/value pairs for varargs params. 1297 if (FTy->isVarArg()) { 1298 for (unsigned i = FTy->getNumParams(), e = CI.getNumArgOperands(); 1299 i != e; ++i) 1300 PushValueAndType(CI.getArgOperand(i), InstID, Vals, VE); // varargs 1301 } 1302 break; 1303 } 1304 case Instruction::VAArg: 1305 Code = bitc::FUNC_CODE_INST_VAARG; 1306 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); // valistty 1307 Vals.push_back(VE.getValueID(I.getOperand(0))); // valist. 1308 Vals.push_back(VE.getTypeID(I.getType())); // restype. 1309 break; 1310 } 1311 1312 Stream.EmitRecord(Code, Vals, AbbrevToUse); 1313 Vals.clear(); 1314} 1315 1316// Emit names for globals/functions etc. 1317static void WriteValueSymbolTable(const ValueSymbolTable &VST, 1318 const llvm_2_9_func::ValueEnumerator &VE, 1319 BitstreamWriter &Stream) { 1320 if (VST.empty()) return; 1321 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4); 1322 1323 // FIXME: Set up the abbrev, we know how many values there are! 1324 // FIXME: We know if the type names can use 7-bit ascii. 1325 SmallVector<unsigned, 64> NameVals; 1326 1327 for (ValueSymbolTable::const_iterator SI = VST.begin(), SE = VST.end(); 1328 SI != SE; ++SI) { 1329 1330 const ValueName &Name = *SI; 1331 1332 // Figure out the encoding to use for the name. 1333 bool is7Bit = true; 1334 bool isChar6 = true; 1335 for (const char *C = Name.getKeyData(), *E = C+Name.getKeyLength(); 1336 C != E; ++C) { 1337 if (isChar6) 1338 isChar6 = BitCodeAbbrevOp::isChar6(*C); 1339 if ((unsigned char)*C & 128) { 1340 is7Bit = false; 1341 break; // don't bother scanning the rest. 1342 } 1343 } 1344 1345 unsigned AbbrevToUse = VST_ENTRY_8_ABBREV; 1346 1347 // VST_ENTRY: [valueid, namechar x N] 1348 // VST_BBENTRY: [bbid, namechar x N] 1349 unsigned Code; 1350 if (isa<BasicBlock>(SI->getValue())) { 1351 Code = bitc::VST_CODE_BBENTRY; 1352 if (isChar6) 1353 AbbrevToUse = VST_BBENTRY_6_ABBREV; 1354 } else { 1355 Code = bitc::VST_CODE_ENTRY; 1356 if (isChar6) 1357 AbbrevToUse = VST_ENTRY_6_ABBREV; 1358 else if (is7Bit) 1359 AbbrevToUse = VST_ENTRY_7_ABBREV; 1360 } 1361 1362 NameVals.push_back(VE.getValueID(SI->getValue())); 1363 for (const char *P = Name.getKeyData(), 1364 *E = Name.getKeyData()+Name.getKeyLength(); P != E; ++P) 1365 NameVals.push_back((unsigned char)*P); 1366 1367 // Emit the finished record. 1368 Stream.EmitRecord(Code, NameVals, AbbrevToUse); 1369 NameVals.clear(); 1370 } 1371 Stream.ExitBlock(); 1372} 1373 1374/// WriteFunction - Emit a function body to the module stream. 1375static void WriteFunction(const Function &F, llvm_2_9_func::ValueEnumerator &VE, 1376 BitstreamWriter &Stream) { 1377 Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4); 1378 VE.incorporateFunction(F); 1379 1380 SmallVector<unsigned, 64> Vals; 1381 1382 // Emit the number of basic blocks, so the reader can create them ahead of 1383 // time. 1384 Vals.push_back(VE.getBasicBlocks().size()); 1385 Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals); 1386 Vals.clear(); 1387 1388 // If there are function-local constants, emit them now. 1389 unsigned CstStart, CstEnd; 1390 VE.getFunctionConstantRange(CstStart, CstEnd); 1391 WriteConstants(CstStart, CstEnd, VE, Stream, false); 1392 1393 // If there is function-local metadata, emit it now. 1394 WriteFunctionLocalMetadata(F, VE, Stream); 1395 1396 // Keep a running idea of what the instruction ID is. 1397 unsigned InstID = CstEnd; 1398 1399 bool NeedsMetadataAttachment = false; 1400 1401 DebugLoc LastDL; 1402 1403 // Finally, emit all the instructions, in order. 1404 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) 1405 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); 1406 I != E; ++I) { 1407 WriteInstruction(*I, InstID, VE, Stream, Vals); 1408 1409 if (!I->getType()->isVoidTy()) 1410 ++InstID; 1411 1412 // If the instruction has metadata, write a metadata attachment later. 1413 NeedsMetadataAttachment |= I->hasMetadataOtherThanDebugLoc(); 1414 1415 // If the instruction has a debug location, emit it. 1416 DebugLoc DL = I->getDebugLoc(); 1417 if (DL.isUnknown()) { 1418 // nothing todo. 1419 } else if (DL == LastDL) { 1420 // Just repeat the same debug loc as last time. 1421 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC_AGAIN, Vals); 1422 } else { 1423 MDNode *Scope, *IA; 1424 DL.getScopeAndInlinedAt(Scope, IA, I->getContext()); 1425 1426 Vals.push_back(DL.getLine()); 1427 Vals.push_back(DL.getCol()); 1428 Vals.push_back(Scope ? VE.getValueID(Scope)+1 : 0); 1429 Vals.push_back(IA ? VE.getValueID(IA)+1 : 0); 1430 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC, Vals); 1431 Vals.clear(); 1432 1433 LastDL = DL; 1434 } 1435 } 1436 1437 // Emit names for all the instructions etc. 1438 WriteValueSymbolTable(F.getValueSymbolTable(), VE, Stream); 1439 1440 if (NeedsMetadataAttachment) 1441 WriteMetadataAttachment(F, VE, Stream); 1442 VE.purgeFunction(); 1443 Stream.ExitBlock(); 1444} 1445 1446// Emit blockinfo, which defines the standard abbreviations etc. 1447static void WriteBlockInfo(const llvm_2_9_func::ValueEnumerator &VE, 1448 BitstreamWriter &Stream) { 1449 // We only want to emit block info records for blocks that have multiple 1450 // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK. Other 1451 // blocks can defined their abbrevs inline. 1452 Stream.EnterBlockInfoBlock(2); 1453 1454 { // 8-bit fixed-width VST_ENTRY/VST_BBENTRY strings. 1455 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1456 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); 1457 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1458 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1459 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 1460 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1461 Abbv) != VST_ENTRY_8_ABBREV) 1462 llvm_unreachable("Unexpected abbrev ordering!"); 1463 } 1464 1465 { // 7-bit fixed width VST_ENTRY strings. 1466 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1467 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 1468 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1469 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1470 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 1471 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1472 Abbv) != VST_ENTRY_7_ABBREV) 1473 llvm_unreachable("Unexpected abbrev ordering!"); 1474 } 1475 { // 6-bit char6 VST_ENTRY strings. 1476 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1477 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 1478 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1479 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1480 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 1481 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1482 Abbv) != VST_ENTRY_6_ABBREV) 1483 llvm_unreachable("Unexpected abbrev ordering!"); 1484 } 1485 { // 6-bit char6 VST_BBENTRY strings. 1486 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1487 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY)); 1488 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1489 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1490 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 1491 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1492 Abbv) != VST_BBENTRY_6_ABBREV) 1493 llvm_unreachable("Unexpected abbrev ordering!"); 1494 } 1495 1496 1497 1498 { // SETTYPE abbrev for CONSTANTS_BLOCK. 1499 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1500 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE)); 1501 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1502 Log2_32_Ceil(VE.getTypes().size()+1))); 1503 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1504 Abbv) != CONSTANTS_SETTYPE_ABBREV) 1505 llvm_unreachable("Unexpected abbrev ordering!"); 1506 } 1507 1508 { // INTEGER abbrev for CONSTANTS_BLOCK. 1509 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1510 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER)); 1511 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1512 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1513 Abbv) != CONSTANTS_INTEGER_ABBREV) 1514 llvm_unreachable("Unexpected abbrev ordering!"); 1515 } 1516 1517 { // CE_CAST abbrev for CONSTANTS_BLOCK. 1518 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1519 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST)); 1520 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // cast opc 1521 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid 1522 Log2_32_Ceil(VE.getTypes().size()+1))); 1523 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id 1524 1525 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1526 Abbv) != CONSTANTS_CE_CAST_Abbrev) 1527 llvm_unreachable("Unexpected abbrev ordering!"); 1528 } 1529 { // NULL abbrev for CONSTANTS_BLOCK. 1530 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1531 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL)); 1532 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1533 Abbv) != CONSTANTS_NULL_Abbrev) 1534 llvm_unreachable("Unexpected abbrev ordering!"); 1535 } 1536 1537 // FIXME: This should only use space for first class types! 1538 1539 { // INST_LOAD abbrev for FUNCTION_BLOCK. 1540 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1541 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD)); 1542 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr 1543 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align 1544 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile 1545 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1546 Abbv) != FUNCTION_INST_LOAD_ABBREV) 1547 llvm_unreachable("Unexpected abbrev ordering!"); 1548 } 1549 { // INST_BINOP abbrev for FUNCTION_BLOCK. 1550 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1551 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP)); 1552 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS 1553 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS 1554 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1555 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1556 Abbv) != FUNCTION_INST_BINOP_ABBREV) 1557 llvm_unreachable("Unexpected abbrev ordering!"); 1558 } 1559 { // INST_BINOP_FLAGS abbrev for FUNCTION_BLOCK. 1560 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1561 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP)); 1562 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS 1563 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS 1564 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1565 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); // flags 1566 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1567 Abbv) != FUNCTION_INST_BINOP_FLAGS_ABBREV) 1568 llvm_unreachable("Unexpected abbrev ordering!"); 1569 } 1570 { // INST_CAST abbrev for FUNCTION_BLOCK. 1571 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1572 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST)); 1573 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // OpVal 1574 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty 1575 Log2_32_Ceil(VE.getTypes().size()+1))); 1576 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1577 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1578 Abbv) != FUNCTION_INST_CAST_ABBREV) 1579 llvm_unreachable("Unexpected abbrev ordering!"); 1580 } 1581 1582 { // INST_RET abbrev for FUNCTION_BLOCK. 1583 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1584 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET)); 1585 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1586 Abbv) != FUNCTION_INST_RET_VOID_ABBREV) 1587 llvm_unreachable("Unexpected abbrev ordering!"); 1588 } 1589 { // INST_RET abbrev for FUNCTION_BLOCK. 1590 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1591 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET)); 1592 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID 1593 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1594 Abbv) != FUNCTION_INST_RET_VAL_ABBREV) 1595 llvm_unreachable("Unexpected abbrev ordering!"); 1596 } 1597 { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK. 1598 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1599 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE)); 1600 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1601 Abbv) != FUNCTION_INST_UNREACHABLE_ABBREV) 1602 llvm_unreachable("Unexpected abbrev ordering!"); 1603 } 1604 1605 Stream.ExitBlock(); 1606} 1607 1608 1609/// WriteModule - Emit the specified module to the bitstream. 1610static void WriteModule(const Module *M, BitstreamWriter &Stream) { 1611 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3); 1612 1613 // Emit the version number if it is non-zero. 1614 if (CurVersion) { 1615 SmallVector<unsigned, 1> Vals; 1616 Vals.push_back(CurVersion); 1617 Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals); 1618 } 1619 1620 // Analyze the module, enumerating globals, functions, etc. 1621 llvm_2_9_func::ValueEnumerator VE(M); 1622 1623 // Emit blockinfo, which defines the standard abbreviations etc. 1624 WriteBlockInfo(VE, Stream); 1625 1626 // Emit information about parameter attributes. 1627 WriteAttributeTable(VE, Stream); 1628 1629 // Emit information describing all of the types in the module. 1630 WriteTypeTable(VE, Stream); 1631 1632 // Emit top-level description of module, including target triple, inline asm, 1633 // descriptors for global variables, and function prototype info. 1634 WriteModuleInfo(M, VE, Stream); 1635 1636 // Emit constants. 1637 WriteModuleConstants(VE, Stream); 1638 1639 // Emit metadata. 1640 WriteModuleMetadata(M, VE, Stream); 1641 1642 // Emit function bodies. 1643 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) 1644 if (!F->isDeclaration()) 1645 WriteFunction(*F, VE, Stream); 1646 1647 // Emit metadata. 1648 WriteModuleMetadataStore(M, Stream); 1649 1650 // Emit names for globals/functions etc. 1651 WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream); 1652 1653 Stream.ExitBlock(); 1654} 1655 1656/// EmitDarwinBCHeader - If generating a bc file on darwin, we have to emit a 1657/// header and trailer to make it compatible with the system archiver. To do 1658/// this we emit the following header, and then emit a trailer that pads the 1659/// file out to be a multiple of 16 bytes. 1660/// 1661/// struct bc_header { 1662/// uint32_t Magic; // 0x0B17C0DE 1663/// uint32_t Version; // Version, currently always 0. 1664/// uint32_t BitcodeOffset; // Offset to traditional bitcode file. 1665/// uint32_t BitcodeSize; // Size of traditional bitcode file. 1666/// uint32_t CPUType; // CPU specifier. 1667/// ... potentially more later ... 1668/// }; 1669enum { 1670 DarwinBCSizeFieldOffset = 3*4, // Offset to bitcode_size. 1671 DarwinBCHeaderSize = 5*4 1672}; 1673 1674static void WriteInt32ToBuffer(uint32_t Value, SmallVectorImpl<char> &Buffer, 1675 uint32_t &Position) { 1676 Buffer[Position + 0] = (unsigned char) (Value >> 0); 1677 Buffer[Position + 1] = (unsigned char) (Value >> 8); 1678 Buffer[Position + 2] = (unsigned char) (Value >> 16); 1679 Buffer[Position + 3] = (unsigned char) (Value >> 24); 1680 Position += 4; 1681} 1682 1683static void EmitDarwinBCHeaderAndTrailer(SmallVectorImpl<char> &Buffer, 1684 const Triple &TT) { 1685 unsigned CPUType = ~0U; 1686 1687 // Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*, arm-*, thumb-*, 1688 // armv[0-9]-*, thumbv[0-9]-*, armv5te-*, or armv6t2-*. The CPUType is a magic 1689 // number from /usr/include/mach/machine.h. It is ok to reproduce the 1690 // specific constants here because they are implicitly part of the Darwin ABI. 1691 enum { 1692 DARWIN_CPU_ARCH_ABI64 = 0x01000000, 1693 DARWIN_CPU_TYPE_X86 = 7, 1694 DARWIN_CPU_TYPE_ARM = 12, 1695 DARWIN_CPU_TYPE_POWERPC = 18 1696 }; 1697 1698 Triple::ArchType Arch = TT.getArch(); 1699 if (Arch == Triple::x86_64) 1700 CPUType = DARWIN_CPU_TYPE_X86 | DARWIN_CPU_ARCH_ABI64; 1701 else if (Arch == Triple::x86) 1702 CPUType = DARWIN_CPU_TYPE_X86; 1703 else if (Arch == Triple::ppc) 1704 CPUType = DARWIN_CPU_TYPE_POWERPC; 1705 else if (Arch == Triple::ppc64) 1706 CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64; 1707 else if (Arch == Triple::arm || Arch == Triple::thumb) 1708 CPUType = DARWIN_CPU_TYPE_ARM; 1709 1710 // Traditional Bitcode starts after header. 1711 assert(Buffer.size() >= DarwinBCHeaderSize && 1712 "Expected header size to be reserved"); 1713 unsigned BCOffset = DarwinBCHeaderSize; 1714 unsigned BCSize = Buffer.size()-DarwinBCHeaderSize; 1715 1716 // Write the magic and version. 1717 unsigned Position = 0; 1718 WriteInt32ToBuffer(0x0B17C0DE , Buffer, Position); 1719 WriteInt32ToBuffer(0 , Buffer, Position); // Version. 1720 WriteInt32ToBuffer(BCOffset , Buffer, Position); 1721 WriteInt32ToBuffer(BCSize , Buffer, Position); 1722 WriteInt32ToBuffer(CPUType , Buffer, Position); 1723 1724 // If the file is not a multiple of 16 bytes, insert dummy padding. 1725 while (Buffer.size() & 15) 1726 Buffer.push_back(0); 1727} 1728 1729/// WriteBitcodeToFile - Write the specified module to the specified output 1730/// stream. 1731void llvm_2_9_func::WriteBitcodeToFile(const Module *M, raw_ostream &Out) { 1732 SmallVector<char, 1024> Buffer; 1733 Buffer.reserve(256*1024); 1734 1735 // If this is darwin or another generic macho target, reserve space for the 1736 // header. 1737 Triple TT(M->getTargetTriple()); 1738 if (TT.isOSDarwin()) 1739 Buffer.insert(Buffer.begin(), DarwinBCHeaderSize, 0); 1740 1741 // Emit the module into the buffer. 1742 { 1743 BitstreamWriter Stream(Buffer); 1744 1745 // Emit the file header. 1746 Stream.Emit((unsigned)'B', 8); 1747 Stream.Emit((unsigned)'C', 8); 1748 Stream.Emit(0x0, 4); 1749 Stream.Emit(0xC, 4); 1750 Stream.Emit(0xE, 4); 1751 Stream.Emit(0xD, 4); 1752 1753 // Emit the module. 1754 WriteModule(M, Stream); 1755 } 1756 1757 if (TT.isOSDarwin()) 1758 EmitDarwinBCHeaderAndTrailer(Buffer, TT); 1759 1760 // Write the generated bitstream to "Out". 1761 Out.write((char*)&Buffer.front(), Buffer.size()); 1762} 1763