BitcodeWriter.cpp revision db37c900ebe6f0ae62a1f77327dd9e5a469ff11e
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 "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> 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 61static unsigned GetEncodedCastOpcode(unsigned Opcode) { 62 switch (Opcode) { 63 default: llvm_unreachable("Unknown cast instruction!"); 64 case Instruction::Trunc : return bitc::CAST_TRUNC; 65 case Instruction::ZExt : return bitc::CAST_ZEXT; 66 case Instruction::SExt : return bitc::CAST_SEXT; 67 case Instruction::FPToUI : return bitc::CAST_FPTOUI; 68 case Instruction::FPToSI : return bitc::CAST_FPTOSI; 69 case Instruction::UIToFP : return bitc::CAST_UITOFP; 70 case Instruction::SIToFP : return bitc::CAST_SITOFP; 71 case Instruction::FPTrunc : return bitc::CAST_FPTRUNC; 72 case Instruction::FPExt : return bitc::CAST_FPEXT; 73 case Instruction::PtrToInt: return bitc::CAST_PTRTOINT; 74 case Instruction::IntToPtr: return bitc::CAST_INTTOPTR; 75 case Instruction::BitCast : return bitc::CAST_BITCAST; 76 } 77} 78 79static unsigned GetEncodedBinaryOpcode(unsigned Opcode) { 80 switch (Opcode) { 81 default: llvm_unreachable("Unknown binary instruction!"); 82 case Instruction::Add: 83 case Instruction::FAdd: return bitc::BINOP_ADD; 84 case Instruction::Sub: 85 case Instruction::FSub: return bitc::BINOP_SUB; 86 case Instruction::Mul: 87 case Instruction::FMul: return bitc::BINOP_MUL; 88 case Instruction::UDiv: return bitc::BINOP_UDIV; 89 case Instruction::FDiv: 90 case Instruction::SDiv: return bitc::BINOP_SDIV; 91 case Instruction::URem: return bitc::BINOP_UREM; 92 case Instruction::FRem: 93 case Instruction::SRem: return bitc::BINOP_SREM; 94 case Instruction::Shl: return bitc::BINOP_SHL; 95 case Instruction::LShr: return bitc::BINOP_LSHR; 96 case Instruction::AShr: return bitc::BINOP_ASHR; 97 case Instruction::And: return bitc::BINOP_AND; 98 case Instruction::Or: return bitc::BINOP_OR; 99 case Instruction::Xor: return bitc::BINOP_XOR; 100 } 101} 102 103static unsigned GetEncodedRMWOperation(AtomicRMWInst::BinOp Op) { 104 switch (Op) { 105 default: llvm_unreachable("Unknown RMW operation!"); 106 case AtomicRMWInst::Xchg: return bitc::RMW_XCHG; 107 case AtomicRMWInst::Add: return bitc::RMW_ADD; 108 case AtomicRMWInst::Sub: return bitc::RMW_SUB; 109 case AtomicRMWInst::And: return bitc::RMW_AND; 110 case AtomicRMWInst::Nand: return bitc::RMW_NAND; 111 case AtomicRMWInst::Or: return bitc::RMW_OR; 112 case AtomicRMWInst::Xor: return bitc::RMW_XOR; 113 case AtomicRMWInst::Max: return bitc::RMW_MAX; 114 case AtomicRMWInst::Min: return bitc::RMW_MIN; 115 case AtomicRMWInst::UMax: return bitc::RMW_UMAX; 116 case AtomicRMWInst::UMin: return bitc::RMW_UMIN; 117 } 118} 119 120static unsigned GetEncodedOrdering(AtomicOrdering Ordering) { 121 switch (Ordering) { 122 default: llvm_unreachable("Unknown atomic ordering"); 123 case NotAtomic: return bitc::ORDERING_NOTATOMIC; 124 case Unordered: return bitc::ORDERING_UNORDERED; 125 case Monotonic: return bitc::ORDERING_MONOTONIC; 126 case Acquire: return bitc::ORDERING_ACQUIRE; 127 case Release: return bitc::ORDERING_RELEASE; 128 case AcquireRelease: return bitc::ORDERING_ACQREL; 129 case SequentiallyConsistent: return bitc::ORDERING_SEQCST; 130 } 131} 132 133static unsigned GetEncodedSynchScope(SynchronizationScope SynchScope) { 134 switch (SynchScope) { 135 default: llvm_unreachable("Unknown synchronization scope"); 136 case SingleThread: return bitc::SYNCHSCOPE_SINGLETHREAD; 137 case CrossThread: return bitc::SYNCHSCOPE_CROSSTHREAD; 138 } 139} 140 141static void WriteStringRecord(unsigned Code, StringRef Str, 142 unsigned AbbrevToUse, BitstreamWriter &Stream) { 143 SmallVector<unsigned, 64> Vals; 144 145 // Code: [strchar x N] 146 for (unsigned i = 0, e = Str.size(); i != e; ++i) { 147 if (AbbrevToUse && !BitCodeAbbrevOp::isChar6(Str[i])) 148 AbbrevToUse = 0; 149 Vals.push_back(Str[i]); 150 } 151 152 // Emit the finished record. 153 Stream.EmitRecord(Code, Vals, AbbrevToUse); 154} 155 156// Emit information about parameter attributes. 157static void WriteAttributeTable(const llvm_2_9_func::ValueEnumerator &VE, 158 BitstreamWriter &Stream) { 159 const std::vector<AttrListPtr> &Attrs = VE.getAttributes(); 160 if (Attrs.empty()) return; 161 162 Stream.EnterSubblock(bitc::PARAMATTR_BLOCK_ID, 3); 163 164 SmallVector<uint64_t, 64> Record; 165 for (unsigned i = 0, e = Attrs.size(); i != e; ++i) { 166 const AttrListPtr &A = Attrs[i]; 167 for (unsigned i = 0, e = A.getNumSlots(); i != e; ++i) { 168 const AttributeWithIndex &PAWI = A.getSlot(i); 169 Record.push_back(PAWI.Index); 170 171 // FIXME: remove in LLVM 3.0 172 // Store the alignment in the bitcode as a 16-bit raw value instead of a 173 // 5-bit log2 encoded value. Shift the bits above the alignment up by 174 // 11 bits. 175 uint64_t FauxAttr = PAWI.Attrs.Raw() & 0xffff; 176 if (PAWI.Attrs & Attribute::Alignment) 177 FauxAttr |= (1ull<<16)<< 178 (((PAWI.Attrs & Attribute::Alignment).Raw()-1) >> 16); 179 FauxAttr |= (PAWI.Attrs.Raw() & (0x3FFull << 21)) << 11; 180 181 Record.push_back(FauxAttr); 182 } 183 184 Stream.EmitRecord(bitc::PARAMATTR_CODE_ENTRY, Record); 185 Record.clear(); 186 } 187 188 Stream.ExitBlock(); 189} 190 191/// WriteTypeTable - Write out the type table for a module. 192static void WriteTypeTable(const llvm_2_9_func::ValueEnumerator &VE, 193 BitstreamWriter &Stream) { 194 const llvm_2_9_func::ValueEnumerator::TypeList &TypeList = VE.getTypes(); 195 196 Stream.EnterSubblock(bitc::TYPE_BLOCK_ID_NEW, 4 /*count from # abbrevs */); 197 SmallVector<uint64_t, 64> TypeVals; 198 199 // Abbrev for TYPE_CODE_POINTER. 200 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 201 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_POINTER)); 202 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 203 Log2_32_Ceil(VE.getTypes().size()+1))); 204 Abbv->Add(BitCodeAbbrevOp(0)); // Addrspace = 0 205 unsigned PtrAbbrev = Stream.EmitAbbrev(Abbv); 206 207 // Abbrev for TYPE_CODE_FUNCTION. 208 Abbv = new BitCodeAbbrev(); 209 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_FUNCTION_OLD)); 210 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isvararg 211 Abbv->Add(BitCodeAbbrevOp(0)); // FIXME: DEAD value, remove in LLVM 3.0 212 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 213 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 214 Log2_32_Ceil(VE.getTypes().size()+1))); 215 unsigned FunctionAbbrev = Stream.EmitAbbrev(Abbv); 216 217 // Abbrev for TYPE_CODE_STRUCT_ANON. 218 Abbv = new BitCodeAbbrev(); 219 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_ANON)); 220 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked 221 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 222 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 223 Log2_32_Ceil(VE.getTypes().size()+1))); 224 unsigned StructAnonAbbrev = Stream.EmitAbbrev(Abbv); 225 226 // Abbrev for TYPE_CODE_STRUCT_NAME. 227 Abbv = new BitCodeAbbrev(); 228 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAME)); 229 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 230 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 231 unsigned StructNameAbbrev = Stream.EmitAbbrev(Abbv); 232 233 // Abbrev for TYPE_CODE_STRUCT_NAMED. 234 Abbv = new BitCodeAbbrev(); 235 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAMED)); 236 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked 237 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 238 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 239 Log2_32_Ceil(VE.getTypes().size()+1))); 240 unsigned StructNamedAbbrev = Stream.EmitAbbrev(Abbv); 241 242 // Abbrev for TYPE_CODE_ARRAY. 243 Abbv = new BitCodeAbbrev(); 244 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_ARRAY)); 245 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // size 246 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 247 Log2_32_Ceil(VE.getTypes().size()+1))); 248 unsigned ArrayAbbrev = Stream.EmitAbbrev(Abbv); 249 250 // Emit an entry count so the reader can reserve space. 251 TypeVals.push_back(TypeList.size()); 252 Stream.EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals); 253 TypeVals.clear(); 254 255 // Loop over all of the types, emitting each in turn. 256 for (unsigned i = 0, e = TypeList.size(); i != e; ++i) { 257 Type *T = TypeList[i]; 258 int AbbrevToUse = 0; 259 unsigned Code = 0; 260 261 switch (T->getTypeID()) { 262 default: llvm_unreachable("Unknown type!"); 263 case Type::VoidTyID: Code = bitc::TYPE_CODE_VOID; break; 264 case Type::FloatTyID: Code = bitc::TYPE_CODE_FLOAT; break; 265 case Type::DoubleTyID: Code = bitc::TYPE_CODE_DOUBLE; break; 266 case Type::X86_FP80TyID: Code = bitc::TYPE_CODE_X86_FP80; break; 267 case Type::FP128TyID: Code = bitc::TYPE_CODE_FP128; break; 268 case Type::PPC_FP128TyID: Code = bitc::TYPE_CODE_PPC_FP128; break; 269 case Type::LabelTyID: Code = bitc::TYPE_CODE_LABEL; break; 270 case Type::MetadataTyID: Code = bitc::TYPE_CODE_METADATA; break; 271 case Type::X86_MMXTyID: Code = bitc::TYPE_CODE_X86_MMX; break; 272 case Type::IntegerTyID: 273 // INTEGER: [width] 274 Code = bitc::TYPE_CODE_INTEGER; 275 TypeVals.push_back(cast<IntegerType>(T)->getBitWidth()); 276 break; 277 case Type::PointerTyID: { 278 PointerType *PTy = cast<PointerType>(T); 279 // POINTER: [pointee type, address space] 280 Code = bitc::TYPE_CODE_POINTER; 281 TypeVals.push_back(VE.getTypeID(PTy->getElementType())); 282 unsigned AddressSpace = PTy->getAddressSpace(); 283 TypeVals.push_back(AddressSpace); 284 if (AddressSpace == 0) AbbrevToUse = PtrAbbrev; 285 break; 286 } 287 case Type::FunctionTyID: { 288 FunctionType *FT = cast<FunctionType>(T); 289 // FUNCTION: [isvararg, attrid, retty, paramty x N] 290 Code = bitc::TYPE_CODE_FUNCTION_OLD; 291 TypeVals.push_back(FT->isVarArg()); 292 TypeVals.push_back(0); // FIXME: DEAD: remove in llvm 3.0 293 TypeVals.push_back(VE.getTypeID(FT->getReturnType())); 294 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) 295 TypeVals.push_back(VE.getTypeID(FT->getParamType(i))); 296 AbbrevToUse = FunctionAbbrev; 297 break; 298 } 299 case Type::StructTyID: { 300 StructType *ST = cast<StructType>(T); 301 // STRUCT: [ispacked, eltty x N] 302 TypeVals.push_back(ST->isPacked()); 303 // Output all of the element types. 304 for (StructType::element_iterator I = ST->element_begin(), 305 E = ST->element_end(); I != E; ++I) 306 TypeVals.push_back(VE.getTypeID(*I)); 307 308 if (ST->isLiteral()) { 309 Code = bitc::TYPE_CODE_STRUCT_ANON; 310 AbbrevToUse = StructAnonAbbrev; 311 } else { 312 if (ST->isOpaque()) { 313 Code = bitc::TYPE_CODE_OPAQUE; 314 } else { 315 Code = bitc::TYPE_CODE_STRUCT_NAMED; 316 AbbrevToUse = StructNamedAbbrev; 317 } 318 319 // Emit the name if it is present. 320 if (!ST->getName().empty()) 321 WriteStringRecord(bitc::TYPE_CODE_STRUCT_NAME, ST->getName(), 322 StructNameAbbrev, Stream); 323 } 324 break; 325 } 326 case Type::ArrayTyID: { 327 ArrayType *AT = cast<ArrayType>(T); 328 // ARRAY: [numelts, eltty] 329 Code = bitc::TYPE_CODE_ARRAY; 330 TypeVals.push_back(AT->getNumElements()); 331 TypeVals.push_back(VE.getTypeID(AT->getElementType())); 332 AbbrevToUse = ArrayAbbrev; 333 break; 334 } 335 case Type::VectorTyID: { 336 VectorType *VT = cast<VectorType>(T); 337 // VECTOR [numelts, eltty] 338 Code = bitc::TYPE_CODE_VECTOR; 339 TypeVals.push_back(VT->getNumElements()); 340 TypeVals.push_back(VE.getTypeID(VT->getElementType())); 341 break; 342 } 343 } 344 345 // Emit the finished record. 346 Stream.EmitRecord(Code, TypeVals, AbbrevToUse); 347 TypeVals.clear(); 348 } 349 350 Stream.ExitBlock(); 351} 352 353static unsigned getEncodedLinkage(const GlobalValue *GV) { 354 switch (GV->getLinkage()) { 355 default: llvm_unreachable("Invalid linkage!"); 356 case GlobalValue::ExternalLinkage: return 0; 357 case GlobalValue::WeakAnyLinkage: return 1; 358 case GlobalValue::AppendingLinkage: return 2; 359 case GlobalValue::InternalLinkage: return 3; 360 case GlobalValue::LinkOnceAnyLinkage: return 4; 361 case GlobalValue::DLLImportLinkage: return 5; 362 case GlobalValue::DLLExportLinkage: return 6; 363 case GlobalValue::ExternalWeakLinkage: return 7; 364 case GlobalValue::CommonLinkage: return 8; 365 case GlobalValue::PrivateLinkage: return 9; 366 case GlobalValue::WeakODRLinkage: return 10; 367 case GlobalValue::LinkOnceODRLinkage: return 11; 368 case GlobalValue::AvailableExternallyLinkage: return 12; 369 case GlobalValue::LinkerPrivateLinkage: return 13; 370 case GlobalValue::LinkerPrivateWeakLinkage: return 14; 371 case GlobalValue::LinkerPrivateWeakDefAutoLinkage: return 15; 372 } 373} 374 375static unsigned getEncodedVisibility(const GlobalValue *GV) { 376 switch (GV->getVisibility()) { 377 default: llvm_unreachable("Invalid visibility!"); 378 case GlobalValue::DefaultVisibility: return 0; 379 case GlobalValue::HiddenVisibility: return 1; 380 case GlobalValue::ProtectedVisibility: return 2; 381 } 382} 383 384// Emit top-level description of module, including target triple, inline asm, 385// descriptors for global variables, and function prototype info. 386static void WriteModuleInfo(const Module *M, 387 const llvm_2_9_func::ValueEnumerator &VE, 388 BitstreamWriter &Stream) { 389 // Emit the list of dependent libraries for the Module. 390 for (Module::lib_iterator I = M->lib_begin(), E = M->lib_end(); I != E; ++I) 391 WriteStringRecord(bitc::MODULE_CODE_DEPLIB, *I, 0/*TODO*/, Stream); 392 393 // Emit various pieces of data attached to a module. 394 if (!M->getTargetTriple().empty()) 395 WriteStringRecord(bitc::MODULE_CODE_TRIPLE, M->getTargetTriple(), 396 0/*TODO*/, Stream); 397 if (!M->getDataLayout().empty()) 398 WriteStringRecord(bitc::MODULE_CODE_DATALAYOUT, M->getDataLayout(), 399 0/*TODO*/, Stream); 400 if (!M->getModuleInlineAsm().empty()) 401 WriteStringRecord(bitc::MODULE_CODE_ASM, M->getModuleInlineAsm(), 402 0/*TODO*/, Stream); 403 404 // Emit information about sections and GC, computing how many there are. Also 405 // compute the maximum alignment value. 406 std::map<std::string, unsigned> SectionMap; 407 std::map<std::string, unsigned> GCMap; 408 unsigned MaxAlignment = 0; 409 unsigned MaxGlobalType = 0; 410 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end(); 411 GV != E; ++GV) { 412 MaxAlignment = std::max(MaxAlignment, GV->getAlignment()); 413 MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV->getType())); 414 if (GV->hasSection()) { 415 // Give section names unique ID's. 416 unsigned &Entry = SectionMap[GV->getSection()]; 417 if (!Entry) { 418 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, GV->getSection(), 419 0/*TODO*/, Stream); 420 Entry = SectionMap.size(); 421 } 422 } 423 } 424 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) { 425 MaxAlignment = std::max(MaxAlignment, F->getAlignment()); 426 if (F->hasSection()) { 427 // Give section names unique ID's. 428 unsigned &Entry = SectionMap[F->getSection()]; 429 if (!Entry) { 430 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, F->getSection(), 431 0/*TODO*/, Stream); 432 Entry = SectionMap.size(); 433 } 434 } 435 if (F->hasGC()) { 436 // Same for GC names. 437 unsigned &Entry = GCMap[F->getGC()]; 438 if (!Entry) { 439 WriteStringRecord(bitc::MODULE_CODE_GCNAME, F->getGC(), 440 0/*TODO*/, Stream); 441 Entry = GCMap.size(); 442 } 443 } 444 } 445 446 // Emit abbrev for globals, now that we know # sections and max alignment. 447 unsigned SimpleGVarAbbrev = 0; 448 if (!M->global_empty()) { 449 // Add an abbrev for common globals with no visibility or thread localness. 450 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 451 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR)); 452 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 453 Log2_32_Ceil(MaxGlobalType+1))); 454 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constant. 455 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer. 456 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // Linkage. 457 if (MaxAlignment == 0) // Alignment. 458 Abbv->Add(BitCodeAbbrevOp(0)); 459 else { 460 unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1; 461 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 462 Log2_32_Ceil(MaxEncAlignment+1))); 463 } 464 if (SectionMap.empty()) // Section. 465 Abbv->Add(BitCodeAbbrevOp(0)); 466 else 467 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 468 Log2_32_Ceil(SectionMap.size()+1))); 469 // Don't bother emitting vis + thread local. 470 SimpleGVarAbbrev = Stream.EmitAbbrev(Abbv); 471 } 472 473 // Emit the global variable information. 474 SmallVector<unsigned, 64> Vals; 475 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end(); 476 GV != E; ++GV) { 477 unsigned AbbrevToUse = 0; 478 479 // GLOBALVAR: [type, isconst, initid, 480 // linkage, alignment, section, visibility, threadlocal, 481 // unnamed_addr] 482 Vals.push_back(VE.getTypeID(GV->getType())); 483 Vals.push_back(GV->isConstant()); 484 Vals.push_back(GV->isDeclaration() ? 0 : 485 (VE.getValueID(GV->getInitializer()) + 1)); 486 Vals.push_back(getEncodedLinkage(GV)); 487 Vals.push_back(Log2_32(GV->getAlignment())+1); 488 Vals.push_back(GV->hasSection() ? SectionMap[GV->getSection()] : 0); 489 if (GV->isThreadLocal() || 490 GV->getVisibility() != GlobalValue::DefaultVisibility || 491 GV->hasUnnamedAddr()) { 492 Vals.push_back(getEncodedVisibility(GV)); 493 Vals.push_back(GV->isThreadLocal()); 494 Vals.push_back(GV->hasUnnamedAddr()); 495 } else { 496 AbbrevToUse = SimpleGVarAbbrev; 497 } 498 499 Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse); 500 Vals.clear(); 501 } 502 503 // Emit the function proto information. 504 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) { 505 // FUNCTION: [type, callingconv, isproto, paramattr, 506 // linkage, alignment, section, visibility, gc, unnamed_addr] 507 Vals.push_back(VE.getTypeID(F->getType())); 508 Vals.push_back(F->getCallingConv()); 509 Vals.push_back(F->isDeclaration()); 510 Vals.push_back(getEncodedLinkage(F)); 511 Vals.push_back(VE.getAttributeID(F->getAttributes())); 512 Vals.push_back(Log2_32(F->getAlignment())+1); 513 Vals.push_back(F->hasSection() ? SectionMap[F->getSection()] : 0); 514 Vals.push_back(getEncodedVisibility(F)); 515 Vals.push_back(F->hasGC() ? GCMap[F->getGC()] : 0); 516 Vals.push_back(F->hasUnnamedAddr()); 517 518 unsigned AbbrevToUse = 0; 519 Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse); 520 Vals.clear(); 521 } 522 523 // Emit the alias information. 524 for (Module::const_alias_iterator AI = M->alias_begin(), E = M->alias_end(); 525 AI != E; ++AI) { 526 Vals.push_back(VE.getTypeID(AI->getType())); 527 Vals.push_back(VE.getValueID(AI->getAliasee())); 528 Vals.push_back(getEncodedLinkage(AI)); 529 Vals.push_back(getEncodedVisibility(AI)); 530 unsigned AbbrevToUse = 0; 531 Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse); 532 Vals.clear(); 533 } 534} 535 536static uint64_t GetOptimizationFlags(const Value *V) { 537 uint64_t Flags = 0; 538 539 if (const OverflowingBinaryOperator *OBO = 540 dyn_cast<OverflowingBinaryOperator>(V)) { 541 if (OBO->hasNoSignedWrap()) 542 Flags |= 1 << bitc::OBO_NO_SIGNED_WRAP; 543 if (OBO->hasNoUnsignedWrap()) 544 Flags |= 1 << bitc::OBO_NO_UNSIGNED_WRAP; 545 } else if (const PossiblyExactOperator *PEO = 546 dyn_cast<PossiblyExactOperator>(V)) { 547 if (PEO->isExact()) 548 Flags |= 1 << bitc::PEO_EXACT; 549 } 550 551 return Flags; 552} 553 554static void WriteMDNode(const MDNode *N, 555 const llvm_2_9_func::ValueEnumerator &VE, 556 BitstreamWriter &Stream, 557 SmallVector<uint64_t, 64> &Record) { 558 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) { 559 if (N->getOperand(i)) { 560 Record.push_back(VE.getTypeID(N->getOperand(i)->getType())); 561 Record.push_back(VE.getValueID(N->getOperand(i))); 562 } else { 563 Record.push_back(VE.getTypeID(Type::getVoidTy(N->getContext()))); 564 Record.push_back(0); 565 } 566 } 567 unsigned MDCode = N->isFunctionLocal() ? bitc::METADATA_FN_NODE : 568 bitc::METADATA_NODE; 569 Stream.EmitRecord(MDCode, Record, 0); 570 Record.clear(); 571} 572 573static void WriteModuleMetadata(const Module *M, 574 const llvm_2_9_func::ValueEnumerator &VE, 575 BitstreamWriter &Stream) { 576 const llvm_2_9_func::ValueEnumerator::ValueList &Vals = VE.getMDValues(); 577 bool StartedMetadataBlock = false; 578 unsigned MDSAbbrev = 0; 579 SmallVector<uint64_t, 64> Record; 580 for (unsigned i = 0, e = Vals.size(); i != e; ++i) { 581 582 if (const MDNode *N = dyn_cast<MDNode>(Vals[i].first)) { 583 if (!N->isFunctionLocal() || !N->getFunction()) { 584 if (!StartedMetadataBlock) { 585 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 586 StartedMetadataBlock = true; 587 } 588 WriteMDNode(N, VE, Stream, Record); 589 } 590 } else if (const MDString *MDS = dyn_cast<MDString>(Vals[i].first)) { 591 if (!StartedMetadataBlock) { 592 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 593 594 // Abbrev for METADATA_STRING. 595 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 596 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_STRING)); 597 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 598 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 599 MDSAbbrev = Stream.EmitAbbrev(Abbv); 600 StartedMetadataBlock = true; 601 } 602 603 // Code: [strchar x N] 604 Record.append(MDS->begin(), MDS->end()); 605 606 // Emit the finished record. 607 Stream.EmitRecord(bitc::METADATA_STRING, Record, MDSAbbrev); 608 Record.clear(); 609 } 610 } 611 612 // Write named metadata. 613 for (Module::const_named_metadata_iterator I = M->named_metadata_begin(), 614 E = M->named_metadata_end(); I != E; ++I) { 615 const NamedMDNode *NMD = I; 616 if (!StartedMetadataBlock) { 617 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 618 StartedMetadataBlock = true; 619 } 620 621 // Write name. 622 StringRef Str = NMD->getName(); 623 for (unsigned i = 0, e = Str.size(); i != e; ++i) 624 Record.push_back(Str[i]); 625 Stream.EmitRecord(bitc::METADATA_NAME, Record, 0/*TODO*/); 626 Record.clear(); 627 628 // Write named metadata operands. 629 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) 630 Record.push_back(VE.getValueID(NMD->getOperand(i))); 631 Stream.EmitRecord(bitc::METADATA_NAMED_NODE, Record, 0); 632 Record.clear(); 633 } 634 635 if (StartedMetadataBlock) 636 Stream.ExitBlock(); 637} 638 639static void WriteFunctionLocalMetadata(const Function &F, 640 const llvm_2_9_func::ValueEnumerator &VE, 641 BitstreamWriter &Stream) { 642 bool StartedMetadataBlock = false; 643 SmallVector<uint64_t, 64> Record; 644 const SmallVector<const MDNode *, 8> &Vals = VE.getFunctionLocalMDValues(); 645 for (unsigned i = 0, e = Vals.size(); i != e; ++i) 646 if (const MDNode *N = Vals[i]) 647 if (N->isFunctionLocal() && N->getFunction() == &F) { 648 if (!StartedMetadataBlock) { 649 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 650 StartedMetadataBlock = true; 651 } 652 WriteMDNode(N, VE, Stream, Record); 653 } 654 655 if (StartedMetadataBlock) 656 Stream.ExitBlock(); 657} 658 659static void WriteMetadataAttachment(const Function &F, 660 const llvm_2_9_func::ValueEnumerator &VE, 661 BitstreamWriter &Stream) { 662 Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3); 663 664 SmallVector<uint64_t, 64> Record; 665 666 // Write metadata attachments 667 // METADATA_ATTACHMENT - [m x [value, [n x [id, mdnode]]] 668 SmallVector<std::pair<unsigned, MDNode*>, 4> MDs; 669 670 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) 671 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); 672 I != E; ++I) { 673 MDs.clear(); 674 I->getAllMetadataOtherThanDebugLoc(MDs); 675 676 // If no metadata, ignore instruction. 677 if (MDs.empty()) continue; 678 679 Record.push_back(VE.getInstructionID(I)); 680 681 for (unsigned i = 0, e = MDs.size(); i != e; ++i) { 682 Record.push_back(MDs[i].first); 683 Record.push_back(VE.getValueID(MDs[i].second)); 684 } 685 Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0); 686 Record.clear(); 687 } 688 689 Stream.ExitBlock(); 690} 691 692static void WriteModuleMetadataStore(const Module *M, BitstreamWriter &Stream) { 693 SmallVector<uint64_t, 64> Record; 694 695 // Write metadata kinds 696 // METADATA_KIND - [n x [id, name]] 697 SmallVector<StringRef, 4> Names; 698 M->getMDKindNames(Names); 699 700 if (Names.empty()) return; 701 702 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 703 704 for (unsigned MDKindID = 0, e = Names.size(); MDKindID != e; ++MDKindID) { 705 Record.push_back(MDKindID); 706 StringRef KName = Names[MDKindID]; 707 Record.append(KName.begin(), KName.end()); 708 709 Stream.EmitRecord(bitc::METADATA_KIND, Record, 0); 710 Record.clear(); 711 } 712 713 Stream.ExitBlock(); 714} 715 716static void WriteConstants(unsigned FirstVal, unsigned LastVal, 717 const llvm_2_9_func::ValueEnumerator &VE, 718 BitstreamWriter &Stream, bool isGlobal) { 719 if (FirstVal == LastVal) return; 720 721 Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4); 722 723 unsigned AggregateAbbrev = 0; 724 unsigned String8Abbrev = 0; 725 unsigned CString7Abbrev = 0; 726 unsigned CString6Abbrev = 0; 727 // If this is a constant pool for the module, emit module-specific abbrevs. 728 if (isGlobal) { 729 // Abbrev for CST_CODE_AGGREGATE. 730 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 731 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE)); 732 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 733 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1))); 734 AggregateAbbrev = Stream.EmitAbbrev(Abbv); 735 736 // Abbrev for CST_CODE_STRING. 737 Abbv = new BitCodeAbbrev(); 738 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING)); 739 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 740 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 741 String8Abbrev = Stream.EmitAbbrev(Abbv); 742 // Abbrev for CST_CODE_CSTRING. 743 Abbv = new BitCodeAbbrev(); 744 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING)); 745 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 746 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 747 CString7Abbrev = Stream.EmitAbbrev(Abbv); 748 // Abbrev for CST_CODE_CSTRING. 749 Abbv = new BitCodeAbbrev(); 750 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING)); 751 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 752 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 753 CString6Abbrev = Stream.EmitAbbrev(Abbv); 754 } 755 756 SmallVector<uint64_t, 64> Record; 757 758 const llvm_2_9_func::ValueEnumerator::ValueList &Vals = VE.getValues(); 759 Type *LastTy = 0; 760 for (unsigned i = FirstVal; i != LastVal; ++i) { 761 const Value *V = Vals[i].first; 762 // If we need to switch types, do so now. 763 if (V->getType() != LastTy) { 764 LastTy = V->getType(); 765 Record.push_back(VE.getTypeID(LastTy)); 766 Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record, 767 CONSTANTS_SETTYPE_ABBREV); 768 Record.clear(); 769 } 770 771 if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) { 772 Record.push_back(unsigned(IA->hasSideEffects()) | 773 unsigned(IA->isAlignStack()) << 1); 774 775 // Add the asm string. 776 const std::string &AsmStr = IA->getAsmString(); 777 Record.push_back(AsmStr.size()); 778 for (unsigned i = 0, e = AsmStr.size(); i != e; ++i) 779 Record.push_back(AsmStr[i]); 780 781 // Add the constraint string. 782 const std::string &ConstraintStr = IA->getConstraintString(); 783 Record.push_back(ConstraintStr.size()); 784 for (unsigned i = 0, e = ConstraintStr.size(); i != e; ++i) 785 Record.push_back(ConstraintStr[i]); 786 Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record); 787 Record.clear(); 788 continue; 789 } 790 const Constant *C = cast<Constant>(V); 791 unsigned Code = -1U; 792 unsigned AbbrevToUse = 0; 793 if (C->isNullValue()) { 794 Code = bitc::CST_CODE_NULL; 795 } else if (isa<UndefValue>(C)) { 796 Code = bitc::CST_CODE_UNDEF; 797 } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) { 798 if (IV->getBitWidth() <= 64) { 799 uint64_t V = IV->getSExtValue(); 800 if ((int64_t)V >= 0) 801 Record.push_back(V << 1); 802 else 803 Record.push_back((-V << 1) | 1); 804 Code = bitc::CST_CODE_INTEGER; 805 AbbrevToUse = CONSTANTS_INTEGER_ABBREV; 806 } else { // Wide integers, > 64 bits in size. 807 // We have an arbitrary precision integer value to write whose 808 // bit width is > 64. However, in canonical unsigned integer 809 // format it is likely that the high bits are going to be zero. 810 // So, we only write the number of active words. 811 unsigned NWords = IV->getValue().getActiveWords(); 812 const uint64_t *RawWords = IV->getValue().getRawData(); 813 for (unsigned i = 0; i != NWords; ++i) { 814 int64_t V = RawWords[i]; 815 if (V >= 0) 816 Record.push_back(V << 1); 817 else 818 Record.push_back((-V << 1) | 1); 819 } 820 Code = bitc::CST_CODE_WIDE_INTEGER; 821 } 822 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) { 823 Code = bitc::CST_CODE_FLOAT; 824 Type *Ty = CFP->getType(); 825 if (Ty->isFloatTy() || Ty->isDoubleTy()) { 826 Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue()); 827 } else if (Ty->isX86_FP80Ty()) { 828 // api needed to prevent premature destruction 829 // bits are not in the same order as a normal i80 APInt, compensate. 830 APInt api = CFP->getValueAPF().bitcastToAPInt(); 831 const uint64_t *p = api.getRawData(); 832 Record.push_back((p[1] << 48) | (p[0] >> 16)); 833 Record.push_back(p[0] & 0xffffLL); 834 } else if (Ty->isFP128Ty() || Ty->isPPC_FP128Ty()) { 835 APInt api = CFP->getValueAPF().bitcastToAPInt(); 836 const uint64_t *p = api.getRawData(); 837 Record.push_back(p[0]); 838 Record.push_back(p[1]); 839 } else { 840 assert (0 && "Unknown FP type!"); 841 } 842 } else if (isa<ConstantDataSequential>(C) && 843 cast<ConstantDataSequential>(C)->isString()) { 844 const ConstantDataSequential *Str = cast<ConstantDataSequential>(C); 845 // Emit constant strings specially. 846 unsigned NumElts = Str->getNumElements(); 847 // If this is a null-terminated string, use the denser CSTRING encoding. 848 if (Str->isCString()) { 849 Code = bitc::CST_CODE_CSTRING; 850 --NumElts; // Don't encode the null, which isn't allowed by char6. 851 } else { 852 Code = bitc::CST_CODE_STRING; 853 AbbrevToUse = String8Abbrev; 854 } 855 bool isCStr7 = Code == bitc::CST_CODE_CSTRING; 856 bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING; 857 for (unsigned i = 0; i != NumElts; ++i) { 858 unsigned char V = Str->getElementAsInteger(i); 859 Record.push_back(V); 860 isCStr7 &= (V & 128) == 0; 861 if (isCStrChar6) 862 isCStrChar6 = BitCodeAbbrevOp::isChar6(V); 863 } 864 865 if (isCStrChar6) 866 AbbrevToUse = CString6Abbrev; 867 else if (isCStr7) 868 AbbrevToUse = CString7Abbrev; 869 } else if (const ConstantDataSequential *CDS = 870 dyn_cast<ConstantDataSequential>(C)) { 871 // We must replace ConstantDataSequential's representation with the 872 // legacy ConstantArray/ConstantVector/ConstantStruct version. 873 // ValueEnumerator is similarly modified to mark the appropriate 874 // Constants as used (so they are emitted). 875 Code = bitc::CST_CODE_AGGREGATE; 876 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) 877 Record.push_back(VE.getValueID(CDS->getElementAsConstant(i))); 878 AbbrevToUse = AggregateAbbrev; 879 } else if (isa<ConstantArray>(C) || isa<ConstantStruct>(C) || 880 isa<ConstantVector>(C)) { 881 Code = bitc::CST_CODE_AGGREGATE; 882 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i) 883 Record.push_back(VE.getValueID(C->getOperand(i))); 884 AbbrevToUse = AggregateAbbrev; 885 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) { 886 switch (CE->getOpcode()) { 887 default: 888 if (Instruction::isCast(CE->getOpcode())) { 889 Code = bitc::CST_CODE_CE_CAST; 890 Record.push_back(GetEncodedCastOpcode(CE->getOpcode())); 891 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 892 Record.push_back(VE.getValueID(C->getOperand(0))); 893 AbbrevToUse = CONSTANTS_CE_CAST_Abbrev; 894 } else { 895 assert(CE->getNumOperands() == 2 && "Unknown constant expr!"); 896 Code = bitc::CST_CODE_CE_BINOP; 897 Record.push_back(GetEncodedBinaryOpcode(CE->getOpcode())); 898 Record.push_back(VE.getValueID(C->getOperand(0))); 899 Record.push_back(VE.getValueID(C->getOperand(1))); 900 uint64_t Flags = GetOptimizationFlags(CE); 901 if (Flags != 0) 902 Record.push_back(Flags); 903 } 904 break; 905 case Instruction::GetElementPtr: 906 Code = bitc::CST_CODE_CE_GEP; 907 if (cast<GEPOperator>(C)->isInBounds()) 908 Code = bitc::CST_CODE_CE_INBOUNDS_GEP; 909 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) { 910 Record.push_back(VE.getTypeID(C->getOperand(i)->getType())); 911 Record.push_back(VE.getValueID(C->getOperand(i))); 912 } 913 break; 914 case Instruction::Select: 915 Code = bitc::CST_CODE_CE_SELECT; 916 Record.push_back(VE.getValueID(C->getOperand(0))); 917 Record.push_back(VE.getValueID(C->getOperand(1))); 918 Record.push_back(VE.getValueID(C->getOperand(2))); 919 break; 920 case Instruction::ExtractElement: 921 Code = bitc::CST_CODE_CE_EXTRACTELT; 922 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 923 Record.push_back(VE.getValueID(C->getOperand(0))); 924 Record.push_back(VE.getValueID(C->getOperand(1))); 925 break; 926 case Instruction::InsertElement: 927 Code = bitc::CST_CODE_CE_INSERTELT; 928 Record.push_back(VE.getValueID(C->getOperand(0))); 929 Record.push_back(VE.getValueID(C->getOperand(1))); 930 Record.push_back(VE.getValueID(C->getOperand(2))); 931 break; 932 case Instruction::ShuffleVector: 933 // If the return type and argument types are the same, this is a 934 // standard shufflevector instruction. If the types are different, 935 // then the shuffle is widening or truncating the input vectors, and 936 // the argument type must also be encoded. 937 if (C->getType() == C->getOperand(0)->getType()) { 938 Code = bitc::CST_CODE_CE_SHUFFLEVEC; 939 } else { 940 Code = bitc::CST_CODE_CE_SHUFVEC_EX; 941 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 942 } 943 Record.push_back(VE.getValueID(C->getOperand(0))); 944 Record.push_back(VE.getValueID(C->getOperand(1))); 945 Record.push_back(VE.getValueID(C->getOperand(2))); 946 break; 947 case Instruction::ICmp: 948 case Instruction::FCmp: 949 Code = bitc::CST_CODE_CE_CMP; 950 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 951 Record.push_back(VE.getValueID(C->getOperand(0))); 952 Record.push_back(VE.getValueID(C->getOperand(1))); 953 Record.push_back(CE->getPredicate()); 954 break; 955 } 956 } else if (const BlockAddress *BA = dyn_cast<BlockAddress>(C)) { 957 Code = bitc::CST_CODE_BLOCKADDRESS; 958 Record.push_back(VE.getTypeID(BA->getFunction()->getType())); 959 Record.push_back(VE.getValueID(BA->getFunction())); 960 Record.push_back(VE.getGlobalBasicBlockID(BA->getBasicBlock())); 961 } else { 962#ifndef NDEBUG 963 C->dump(); 964#endif 965 llvm_unreachable("Unknown constant!"); 966 } 967 Stream.EmitRecord(Code, Record, AbbrevToUse); 968 Record.clear(); 969 } 970 971 Stream.ExitBlock(); 972} 973 974static void WriteModuleConstants(const llvm_2_9_func::ValueEnumerator &VE, 975 BitstreamWriter &Stream) { 976 const llvm_2_9_func::ValueEnumerator::ValueList &Vals = VE.getValues(); 977 978 // Find the first constant to emit, which is the first non-globalvalue value. 979 // We know globalvalues have been emitted by WriteModuleInfo. 980 for (unsigned i = 0, e = Vals.size(); i != e; ++i) { 981 if (!isa<GlobalValue>(Vals[i].first)) { 982 WriteConstants(i, Vals.size(), VE, Stream, true); 983 return; 984 } 985 } 986} 987 988/// PushValueAndType - The file has to encode both the value and type id for 989/// many values, because we need to know what type to create for forward 990/// references. However, most operands are not forward references, so this type 991/// field is not needed. 992/// 993/// This function adds V's value ID to Vals. If the value ID is higher than the 994/// instruction ID, then it is a forward reference, and it also includes the 995/// type ID. 996static bool PushValueAndType(const Value *V, unsigned InstID, 997 SmallVector<unsigned, 64> &Vals, 998 llvm_2_9_func::ValueEnumerator &VE) { 999 unsigned ValID = VE.getValueID(V); 1000 Vals.push_back(ValID); 1001 if (ValID >= InstID) { 1002 Vals.push_back(VE.getTypeID(V->getType())); 1003 return true; 1004 } 1005 return false; 1006} 1007 1008/// WriteInstruction - Emit an instruction to the specified stream. 1009static void WriteInstruction(const Instruction &I, unsigned InstID, 1010 llvm_2_9_func::ValueEnumerator &VE, 1011 BitstreamWriter &Stream, 1012 SmallVector<unsigned, 64> &Vals) { 1013 unsigned Code = 0; 1014 unsigned AbbrevToUse = 0; 1015 VE.setInstructionID(&I); 1016 switch (I.getOpcode()) { 1017 default: 1018 if (Instruction::isCast(I.getOpcode())) { 1019 Code = bitc::FUNC_CODE_INST_CAST; 1020 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 1021 AbbrevToUse = FUNCTION_INST_CAST_ABBREV; 1022 Vals.push_back(VE.getTypeID(I.getType())); 1023 Vals.push_back(GetEncodedCastOpcode(I.getOpcode())); 1024 } else { 1025 assert(isa<BinaryOperator>(I) && "Unknown instruction!"); 1026 Code = bitc::FUNC_CODE_INST_BINOP; 1027 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 1028 AbbrevToUse = FUNCTION_INST_BINOP_ABBREV; 1029 Vals.push_back(VE.getValueID(I.getOperand(1))); 1030 Vals.push_back(GetEncodedBinaryOpcode(I.getOpcode())); 1031 uint64_t Flags = GetOptimizationFlags(&I); 1032 if (Flags != 0) { 1033 if (AbbrevToUse == FUNCTION_INST_BINOP_ABBREV) 1034 AbbrevToUse = FUNCTION_INST_BINOP_FLAGS_ABBREV; 1035 Vals.push_back(Flags); 1036 } 1037 } 1038 break; 1039 1040 case Instruction::GetElementPtr: 1041 Code = bitc::FUNC_CODE_INST_GEP; 1042 if (cast<GEPOperator>(&I)->isInBounds()) 1043 Code = bitc::FUNC_CODE_INST_INBOUNDS_GEP; 1044 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 1045 PushValueAndType(I.getOperand(i), InstID, Vals, VE); 1046 break; 1047 case Instruction::ExtractValue: { 1048 Code = bitc::FUNC_CODE_INST_EXTRACTVAL; 1049 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1050 const ExtractValueInst *EVI = cast<ExtractValueInst>(&I); 1051 for (const unsigned *i = EVI->idx_begin(), *e = EVI->idx_end(); i != e; ++i) 1052 Vals.push_back(*i); 1053 break; 1054 } 1055 case Instruction::InsertValue: { 1056 Code = bitc::FUNC_CODE_INST_INSERTVAL; 1057 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1058 PushValueAndType(I.getOperand(1), InstID, Vals, VE); 1059 const InsertValueInst *IVI = cast<InsertValueInst>(&I); 1060 for (const unsigned *i = IVI->idx_begin(), *e = IVI->idx_end(); i != e; ++i) 1061 Vals.push_back(*i); 1062 break; 1063 } 1064 case Instruction::Select: 1065 Code = bitc::FUNC_CODE_INST_VSELECT; 1066 PushValueAndType(I.getOperand(1), InstID, Vals, VE); 1067 Vals.push_back(VE.getValueID(I.getOperand(2))); 1068 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1069 break; 1070 case Instruction::ExtractElement: 1071 Code = bitc::FUNC_CODE_INST_EXTRACTELT; 1072 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1073 Vals.push_back(VE.getValueID(I.getOperand(1))); 1074 break; 1075 case Instruction::InsertElement: 1076 Code = bitc::FUNC_CODE_INST_INSERTELT; 1077 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1078 Vals.push_back(VE.getValueID(I.getOperand(1))); 1079 Vals.push_back(VE.getValueID(I.getOperand(2))); 1080 break; 1081 case Instruction::ShuffleVector: 1082 Code = bitc::FUNC_CODE_INST_SHUFFLEVEC; 1083 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1084 Vals.push_back(VE.getValueID(I.getOperand(1))); 1085 Vals.push_back(VE.getValueID(I.getOperand(2))); 1086 break; 1087 case Instruction::ICmp: 1088 case Instruction::FCmp: 1089 // compare returning Int1Ty or vector of Int1Ty 1090 Code = bitc::FUNC_CODE_INST_CMP2; 1091 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1092 Vals.push_back(VE.getValueID(I.getOperand(1))); 1093 Vals.push_back(cast<CmpInst>(I).getPredicate()); 1094 break; 1095 1096 case Instruction::Ret: 1097 { 1098 Code = bitc::FUNC_CODE_INST_RET; 1099 unsigned NumOperands = I.getNumOperands(); 1100 if (NumOperands == 0) 1101 AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV; 1102 else if (NumOperands == 1) { 1103 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 1104 AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV; 1105 } else { 1106 for (unsigned i = 0, e = NumOperands; i != e; ++i) 1107 PushValueAndType(I.getOperand(i), InstID, Vals, VE); 1108 } 1109 } 1110 break; 1111 case Instruction::Br: 1112 { 1113 Code = bitc::FUNC_CODE_INST_BR; 1114 BranchInst &II = cast<BranchInst>(I); 1115 Vals.push_back(VE.getValueID(II.getSuccessor(0))); 1116 if (II.isConditional()) { 1117 Vals.push_back(VE.getValueID(II.getSuccessor(1))); 1118 Vals.push_back(VE.getValueID(II.getCondition())); 1119 } 1120 } 1121 break; 1122 case Instruction::Switch: 1123 Code = bitc::FUNC_CODE_INST_SWITCH; 1124 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 1125 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 1126 Vals.push_back(VE.getValueID(I.getOperand(i))); 1127 break; 1128 case Instruction::IndirectBr: 1129 Code = bitc::FUNC_CODE_INST_INDIRECTBR; 1130 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 1131 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 1132 Vals.push_back(VE.getValueID(I.getOperand(i))); 1133 break; 1134 1135 case Instruction::Invoke: { 1136 const InvokeInst *II = cast<InvokeInst>(&I); 1137 const Value *Callee(II->getCalledValue()); 1138 PointerType *PTy = cast<PointerType>(Callee->getType()); 1139 FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 1140 Code = bitc::FUNC_CODE_INST_INVOKE; 1141 1142 Vals.push_back(VE.getAttributeID(II->getAttributes())); 1143 Vals.push_back(II->getCallingConv()); 1144 Vals.push_back(VE.getValueID(II->getNormalDest())); 1145 Vals.push_back(VE.getValueID(II->getUnwindDest())); 1146 PushValueAndType(Callee, InstID, Vals, VE); 1147 1148 // Emit value #'s for the fixed parameters. 1149 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) 1150 Vals.push_back(VE.getValueID(I.getOperand(i))); // fixed param. 1151 1152 // Emit type/value pairs for varargs params. 1153 if (FTy->isVarArg()) { 1154 for (unsigned i = FTy->getNumParams(), e = I.getNumOperands()-3; 1155 i != e; ++i) 1156 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // vararg 1157 } 1158 break; 1159 } 1160 case Instruction::Resume: 1161 Code = bitc::FUNC_CODE_INST_RESUME; 1162 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1163 break; 1164 case Instruction::Unreachable: 1165 Code = bitc::FUNC_CODE_INST_UNREACHABLE; 1166 AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV; 1167 break; 1168 1169 case Instruction::PHI: { 1170 const PHINode &PN = cast<PHINode>(I); 1171 Code = bitc::FUNC_CODE_INST_PHI; 1172 Vals.push_back(VE.getTypeID(PN.getType())); 1173 for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i) { 1174 Vals.push_back(VE.getValueID(PN.getIncomingValue(i))); 1175 Vals.push_back(VE.getValueID(PN.getIncomingBlock(i))); 1176 } 1177 break; 1178 } 1179 1180 case Instruction::LandingPad: { 1181 const LandingPadInst &LP = cast<LandingPadInst>(I); 1182 Code = bitc::FUNC_CODE_INST_LANDINGPAD; 1183 Vals.push_back(VE.getTypeID(LP.getType())); 1184 PushValueAndType(LP.getPersonalityFn(), InstID, Vals, VE); 1185 Vals.push_back(LP.isCleanup()); 1186 Vals.push_back(LP.getNumClauses()); 1187 for (unsigned I = 0, E = LP.getNumClauses(); I != E; ++I) { 1188 if (LP.isCatch(I)) 1189 Vals.push_back(LandingPadInst::Catch); 1190 else 1191 Vals.push_back(LandingPadInst::Filter); 1192 PushValueAndType(LP.getClause(I), InstID, Vals, VE); 1193 } 1194 break; 1195 } 1196 1197 case Instruction::Alloca: 1198 Code = bitc::FUNC_CODE_INST_ALLOCA; 1199 Vals.push_back(VE.getTypeID(I.getType())); 1200 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 1201 Vals.push_back(VE.getValueID(I.getOperand(0))); // size. 1202 Vals.push_back(Log2_32(cast<AllocaInst>(I).getAlignment())+1); 1203 break; 1204 1205 case Instruction::Load: 1206 if (cast<LoadInst>(I).isAtomic()) { 1207 Code = bitc::FUNC_CODE_INST_LOADATOMIC; 1208 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1209 } else { 1210 Code = bitc::FUNC_CODE_INST_LOAD; 1211 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) // ptr 1212 AbbrevToUse = FUNCTION_INST_LOAD_ABBREV; 1213 } 1214 Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1); 1215 Vals.push_back(cast<LoadInst>(I).isVolatile()); 1216 if (cast<LoadInst>(I).isAtomic()) { 1217 Vals.push_back(GetEncodedOrdering(cast<LoadInst>(I).getOrdering())); 1218 Vals.push_back(GetEncodedSynchScope(cast<LoadInst>(I).getSynchScope())); 1219 } 1220 break; 1221 case Instruction::Store: 1222 if (cast<StoreInst>(I).isAtomic()) 1223 Code = bitc::FUNC_CODE_INST_STOREATOMIC; 1224 else 1225 Code = bitc::FUNC_CODE_INST_STORE; 1226 PushValueAndType(I.getOperand(1), InstID, Vals, VE); // ptrty + ptr 1227 Vals.push_back(VE.getValueID(I.getOperand(0))); // val. 1228 Vals.push_back(Log2_32(cast<StoreInst>(I).getAlignment())+1); 1229 Vals.push_back(cast<StoreInst>(I).isVolatile()); 1230 if (cast<StoreInst>(I).isAtomic()) { 1231 Vals.push_back(GetEncodedOrdering(cast<StoreInst>(I).getOrdering())); 1232 Vals.push_back(GetEncodedSynchScope(cast<StoreInst>(I).getSynchScope())); 1233 } 1234 break; 1235 case Instruction::AtomicCmpXchg: 1236 Code = bitc::FUNC_CODE_INST_CMPXCHG; 1237 PushValueAndType(I.getOperand(0), InstID, Vals, VE); // ptrty + ptr 1238 Vals.push_back(VE.getValueID(I.getOperand(1))); // cmp. 1239 Vals.push_back(VE.getValueID(I.getOperand(2))); // newval. 1240 Vals.push_back(cast<AtomicCmpXchgInst>(I).isVolatile()); 1241 Vals.push_back(GetEncodedOrdering( 1242 cast<AtomicCmpXchgInst>(I).getOrdering())); 1243 Vals.push_back(GetEncodedSynchScope( 1244 cast<AtomicCmpXchgInst>(I).getSynchScope())); 1245 break; 1246 case Instruction::AtomicRMW: 1247 Code = bitc::FUNC_CODE_INST_ATOMICRMW; 1248 PushValueAndType(I.getOperand(0), InstID, Vals, VE); // ptrty + ptr 1249 Vals.push_back(VE.getValueID(I.getOperand(1))); // val. 1250 Vals.push_back(GetEncodedRMWOperation( 1251 cast<AtomicRMWInst>(I).getOperation())); 1252 Vals.push_back(cast<AtomicRMWInst>(I).isVolatile()); 1253 Vals.push_back(GetEncodedOrdering(cast<AtomicRMWInst>(I).getOrdering())); 1254 Vals.push_back(GetEncodedSynchScope( 1255 cast<AtomicRMWInst>(I).getSynchScope())); 1256 break; 1257 case Instruction::Fence: 1258 Code = bitc::FUNC_CODE_INST_FENCE; 1259 Vals.push_back(GetEncodedOrdering(cast<FenceInst>(I).getOrdering())); 1260 Vals.push_back(GetEncodedSynchScope(cast<FenceInst>(I).getSynchScope())); 1261 break; 1262 case Instruction::Call: { 1263 const CallInst &CI = cast<CallInst>(I); 1264 PointerType *PTy = cast<PointerType>(CI.getCalledValue()->getType()); 1265 FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 1266 1267 Code = bitc::FUNC_CODE_INST_CALL; 1268 1269 Vals.push_back(VE.getAttributeID(CI.getAttributes())); 1270 Vals.push_back((CI.getCallingConv() << 1) | unsigned(CI.isTailCall())); 1271 PushValueAndType(CI.getCalledValue(), InstID, Vals, VE); // Callee 1272 1273 // Emit value #'s for the fixed parameters. 1274 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) 1275 Vals.push_back(VE.getValueID(CI.getArgOperand(i))); // fixed param. 1276 1277 // Emit type/value pairs for varargs params. 1278 if (FTy->isVarArg()) { 1279 for (unsigned i = FTy->getNumParams(), e = CI.getNumArgOperands(); 1280 i != e; ++i) 1281 PushValueAndType(CI.getArgOperand(i), InstID, Vals, VE); // varargs 1282 } 1283 break; 1284 } 1285 case Instruction::VAArg: 1286 Code = bitc::FUNC_CODE_INST_VAARG; 1287 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); // valistty 1288 Vals.push_back(VE.getValueID(I.getOperand(0))); // valist. 1289 Vals.push_back(VE.getTypeID(I.getType())); // restype. 1290 break; 1291 } 1292 1293 Stream.EmitRecord(Code, Vals, AbbrevToUse); 1294 Vals.clear(); 1295} 1296 1297// Emit names for globals/functions etc. 1298static void WriteValueSymbolTable(const ValueSymbolTable &VST, 1299 const llvm_2_9_func::ValueEnumerator &VE, 1300 BitstreamWriter &Stream) { 1301 if (VST.empty()) return; 1302 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4); 1303 1304 // FIXME: Set up the abbrev, we know how many values there are! 1305 // FIXME: We know if the type names can use 7-bit ascii. 1306 SmallVector<unsigned, 64> NameVals; 1307 1308 for (ValueSymbolTable::const_iterator SI = VST.begin(), SE = VST.end(); 1309 SI != SE; ++SI) { 1310 1311 const ValueName &Name = *SI; 1312 1313 // Figure out the encoding to use for the name. 1314 bool is7Bit = true; 1315 bool isChar6 = true; 1316 for (const char *C = Name.getKeyData(), *E = C+Name.getKeyLength(); 1317 C != E; ++C) { 1318 if (isChar6) 1319 isChar6 = BitCodeAbbrevOp::isChar6(*C); 1320 if ((unsigned char)*C & 128) { 1321 is7Bit = false; 1322 break; // don't bother scanning the rest. 1323 } 1324 } 1325 1326 unsigned AbbrevToUse = VST_ENTRY_8_ABBREV; 1327 1328 // VST_ENTRY: [valueid, namechar x N] 1329 // VST_BBENTRY: [bbid, namechar x N] 1330 unsigned Code; 1331 if (isa<BasicBlock>(SI->getValue())) { 1332 Code = bitc::VST_CODE_BBENTRY; 1333 if (isChar6) 1334 AbbrevToUse = VST_BBENTRY_6_ABBREV; 1335 } else { 1336 Code = bitc::VST_CODE_ENTRY; 1337 if (isChar6) 1338 AbbrevToUse = VST_ENTRY_6_ABBREV; 1339 else if (is7Bit) 1340 AbbrevToUse = VST_ENTRY_7_ABBREV; 1341 } 1342 1343 NameVals.push_back(VE.getValueID(SI->getValue())); 1344 for (const char *P = Name.getKeyData(), 1345 *E = Name.getKeyData()+Name.getKeyLength(); P != E; ++P) 1346 NameVals.push_back((unsigned char)*P); 1347 1348 // Emit the finished record. 1349 Stream.EmitRecord(Code, NameVals, AbbrevToUse); 1350 NameVals.clear(); 1351 } 1352 Stream.ExitBlock(); 1353} 1354 1355/// WriteFunction - Emit a function body to the module stream. 1356static void WriteFunction(const Function &F, llvm_2_9_func::ValueEnumerator &VE, 1357 BitstreamWriter &Stream) { 1358 Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4); 1359 VE.incorporateFunction(F); 1360 1361 SmallVector<unsigned, 64> Vals; 1362 1363 // Emit the number of basic blocks, so the reader can create them ahead of 1364 // time. 1365 Vals.push_back(VE.getBasicBlocks().size()); 1366 Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals); 1367 Vals.clear(); 1368 1369 // If there are function-local constants, emit them now. 1370 unsigned CstStart, CstEnd; 1371 VE.getFunctionConstantRange(CstStart, CstEnd); 1372 WriteConstants(CstStart, CstEnd, VE, Stream, false); 1373 1374 // If there is function-local metadata, emit it now. 1375 WriteFunctionLocalMetadata(F, VE, Stream); 1376 1377 // Keep a running idea of what the instruction ID is. 1378 unsigned InstID = CstEnd; 1379 1380 bool NeedsMetadataAttachment = false; 1381 1382 DebugLoc LastDL; 1383 1384 // Finally, emit all the instructions, in order. 1385 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) 1386 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); 1387 I != E; ++I) { 1388 WriteInstruction(*I, InstID, VE, Stream, Vals); 1389 1390 if (!I->getType()->isVoidTy()) 1391 ++InstID; 1392 1393 // If the instruction has metadata, write a metadata attachment later. 1394 NeedsMetadataAttachment |= I->hasMetadataOtherThanDebugLoc(); 1395 1396 // If the instruction has a debug location, emit it. 1397 DebugLoc DL = I->getDebugLoc(); 1398 if (DL.isUnknown()) { 1399 // nothing todo. 1400 } else if (DL == LastDL) { 1401 // Just repeat the same debug loc as last time. 1402 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC_AGAIN, Vals); 1403 } else { 1404 MDNode *Scope, *IA; 1405 DL.getScopeAndInlinedAt(Scope, IA, I->getContext()); 1406 1407 Vals.push_back(DL.getLine()); 1408 Vals.push_back(DL.getCol()); 1409 Vals.push_back(Scope ? VE.getValueID(Scope)+1 : 0); 1410 Vals.push_back(IA ? VE.getValueID(IA)+1 : 0); 1411 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC, Vals); 1412 Vals.clear(); 1413 1414 LastDL = DL; 1415 } 1416 } 1417 1418 // Emit names for all the instructions etc. 1419 WriteValueSymbolTable(F.getValueSymbolTable(), VE, Stream); 1420 1421 if (NeedsMetadataAttachment) 1422 WriteMetadataAttachment(F, VE, Stream); 1423 VE.purgeFunction(); 1424 Stream.ExitBlock(); 1425} 1426 1427// Emit blockinfo, which defines the standard abbreviations etc. 1428static void WriteBlockInfo(const llvm_2_9_func::ValueEnumerator &VE, 1429 BitstreamWriter &Stream) { 1430 // We only want to emit block info records for blocks that have multiple 1431 // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK. Other 1432 // blocks can defined their abbrevs inline. 1433 Stream.EnterBlockInfoBlock(2); 1434 1435 { // 8-bit fixed-width VST_ENTRY/VST_BBENTRY strings. 1436 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1437 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); 1438 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1439 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1440 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 1441 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1442 Abbv) != VST_ENTRY_8_ABBREV) 1443 llvm_unreachable("Unexpected abbrev ordering!"); 1444 } 1445 1446 { // 7-bit fixed width VST_ENTRY strings. 1447 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1448 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 1449 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1450 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1451 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 1452 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1453 Abbv) != VST_ENTRY_7_ABBREV) 1454 llvm_unreachable("Unexpected abbrev ordering!"); 1455 } 1456 { // 6-bit char6 VST_ENTRY strings. 1457 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1458 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 1459 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1460 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1461 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 1462 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1463 Abbv) != VST_ENTRY_6_ABBREV) 1464 llvm_unreachable("Unexpected abbrev ordering!"); 1465 } 1466 { // 6-bit char6 VST_BBENTRY strings. 1467 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1468 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY)); 1469 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1470 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1471 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 1472 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1473 Abbv) != VST_BBENTRY_6_ABBREV) 1474 llvm_unreachable("Unexpected abbrev ordering!"); 1475 } 1476 1477 1478 1479 { // SETTYPE abbrev for CONSTANTS_BLOCK. 1480 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1481 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE)); 1482 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1483 Log2_32_Ceil(VE.getTypes().size()+1))); 1484 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1485 Abbv) != CONSTANTS_SETTYPE_ABBREV) 1486 llvm_unreachable("Unexpected abbrev ordering!"); 1487 } 1488 1489 { // INTEGER abbrev for CONSTANTS_BLOCK. 1490 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1491 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER)); 1492 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1493 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1494 Abbv) != CONSTANTS_INTEGER_ABBREV) 1495 llvm_unreachable("Unexpected abbrev ordering!"); 1496 } 1497 1498 { // CE_CAST abbrev for CONSTANTS_BLOCK. 1499 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1500 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST)); 1501 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // cast opc 1502 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid 1503 Log2_32_Ceil(VE.getTypes().size()+1))); 1504 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id 1505 1506 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1507 Abbv) != CONSTANTS_CE_CAST_Abbrev) 1508 llvm_unreachable("Unexpected abbrev ordering!"); 1509 } 1510 { // NULL abbrev for CONSTANTS_BLOCK. 1511 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1512 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL)); 1513 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1514 Abbv) != CONSTANTS_NULL_Abbrev) 1515 llvm_unreachable("Unexpected abbrev ordering!"); 1516 } 1517 1518 // FIXME: This should only use space for first class types! 1519 1520 { // INST_LOAD abbrev for FUNCTION_BLOCK. 1521 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1522 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD)); 1523 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr 1524 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align 1525 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile 1526 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1527 Abbv) != FUNCTION_INST_LOAD_ABBREV) 1528 llvm_unreachable("Unexpected abbrev ordering!"); 1529 } 1530 { // INST_BINOP abbrev for FUNCTION_BLOCK. 1531 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1532 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP)); 1533 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS 1534 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS 1535 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1536 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1537 Abbv) != FUNCTION_INST_BINOP_ABBREV) 1538 llvm_unreachable("Unexpected abbrev ordering!"); 1539 } 1540 { // INST_BINOP_FLAGS abbrev for FUNCTION_BLOCK. 1541 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1542 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP)); 1543 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS 1544 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS 1545 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1546 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); // flags 1547 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1548 Abbv) != FUNCTION_INST_BINOP_FLAGS_ABBREV) 1549 llvm_unreachable("Unexpected abbrev ordering!"); 1550 } 1551 { // INST_CAST abbrev for FUNCTION_BLOCK. 1552 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1553 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST)); 1554 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // OpVal 1555 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty 1556 Log2_32_Ceil(VE.getTypes().size()+1))); 1557 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1558 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1559 Abbv) != FUNCTION_INST_CAST_ABBREV) 1560 llvm_unreachable("Unexpected abbrev ordering!"); 1561 } 1562 1563 { // INST_RET abbrev for FUNCTION_BLOCK. 1564 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1565 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET)); 1566 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1567 Abbv) != FUNCTION_INST_RET_VOID_ABBREV) 1568 llvm_unreachable("Unexpected abbrev ordering!"); 1569 } 1570 { // INST_RET abbrev for FUNCTION_BLOCK. 1571 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1572 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET)); 1573 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID 1574 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1575 Abbv) != FUNCTION_INST_RET_VAL_ABBREV) 1576 llvm_unreachable("Unexpected abbrev ordering!"); 1577 } 1578 { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK. 1579 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1580 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE)); 1581 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1582 Abbv) != FUNCTION_INST_UNREACHABLE_ABBREV) 1583 llvm_unreachable("Unexpected abbrev ordering!"); 1584 } 1585 1586 Stream.ExitBlock(); 1587} 1588 1589 1590/// WriteModule - Emit the specified module to the bitstream. 1591static void WriteModule(const Module *M, BitstreamWriter &Stream) { 1592 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3); 1593 1594 // Emit the version number if it is non-zero. 1595 if (CurVersion) { 1596 SmallVector<unsigned, 1> Vals; 1597 Vals.push_back(CurVersion); 1598 Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals); 1599 } 1600 1601 // Analyze the module, enumerating globals, functions, etc. 1602 llvm_2_9_func::ValueEnumerator VE(M); 1603 1604 // Emit blockinfo, which defines the standard abbreviations etc. 1605 WriteBlockInfo(VE, Stream); 1606 1607 // Emit information about parameter attributes. 1608 WriteAttributeTable(VE, Stream); 1609 1610 // Emit information describing all of the types in the module. 1611 WriteTypeTable(VE, Stream); 1612 1613 // Emit top-level description of module, including target triple, inline asm, 1614 // descriptors for global variables, and function prototype info. 1615 WriteModuleInfo(M, VE, Stream); 1616 1617 // Emit constants. 1618 WriteModuleConstants(VE, Stream); 1619 1620 // Emit metadata. 1621 WriteModuleMetadata(M, VE, Stream); 1622 1623 // Emit function bodies. 1624 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) 1625 if (!F->isDeclaration()) 1626 WriteFunction(*F, VE, Stream); 1627 1628 // Emit metadata. 1629 WriteModuleMetadataStore(M, Stream); 1630 1631 // Emit names for globals/functions etc. 1632 WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream); 1633 1634 Stream.ExitBlock(); 1635} 1636 1637/// EmitDarwinBCHeader - If generating a bc file on darwin, we have to emit a 1638/// header and trailer to make it compatible with the system archiver. To do 1639/// this we emit the following header, and then emit a trailer that pads the 1640/// file out to be a multiple of 16 bytes. 1641/// 1642/// struct bc_header { 1643/// uint32_t Magic; // 0x0B17C0DE 1644/// uint32_t Version; // Version, currently always 0. 1645/// uint32_t BitcodeOffset; // Offset to traditional bitcode file. 1646/// uint32_t BitcodeSize; // Size of traditional bitcode file. 1647/// uint32_t CPUType; // CPU specifier. 1648/// ... potentially more later ... 1649/// }; 1650enum { 1651 DarwinBCSizeFieldOffset = 3*4, // Offset to bitcode_size. 1652 DarwinBCHeaderSize = 5*4 1653}; 1654 1655static void WriteInt32ToBuffer(uint32_t Value, SmallVectorImpl<char> &Buffer, 1656 uint32_t &Position) { 1657 Buffer[Position + 0] = (unsigned char) (Value >> 0); 1658 Buffer[Position + 1] = (unsigned char) (Value >> 8); 1659 Buffer[Position + 2] = (unsigned char) (Value >> 16); 1660 Buffer[Position + 3] = (unsigned char) (Value >> 24); 1661 Position += 4; 1662} 1663 1664static void EmitDarwinBCHeaderAndTrailer(SmallVectorImpl<char> &Buffer, 1665 const Triple &TT) { 1666 unsigned CPUType = ~0U; 1667 1668 // Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*, arm-*, thumb-*, 1669 // armv[0-9]-*, thumbv[0-9]-*, armv5te-*, or armv6t2-*. The CPUType is a magic 1670 // number from /usr/include/mach/machine.h. It is ok to reproduce the 1671 // specific constants here because they are implicitly part of the Darwin ABI. 1672 enum { 1673 DARWIN_CPU_ARCH_ABI64 = 0x01000000, 1674 DARWIN_CPU_TYPE_X86 = 7, 1675 DARWIN_CPU_TYPE_ARM = 12, 1676 DARWIN_CPU_TYPE_POWERPC = 18 1677 }; 1678 1679 Triple::ArchType Arch = TT.getArch(); 1680 if (Arch == Triple::x86_64) 1681 CPUType = DARWIN_CPU_TYPE_X86 | DARWIN_CPU_ARCH_ABI64; 1682 else if (Arch == Triple::x86) 1683 CPUType = DARWIN_CPU_TYPE_X86; 1684 else if (Arch == Triple::ppc) 1685 CPUType = DARWIN_CPU_TYPE_POWERPC; 1686 else if (Arch == Triple::ppc64) 1687 CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64; 1688 else if (Arch == Triple::arm || Arch == Triple::thumb) 1689 CPUType = DARWIN_CPU_TYPE_ARM; 1690 1691 // Traditional Bitcode starts after header. 1692 assert(Buffer.size() >= DarwinBCHeaderSize && 1693 "Expected header size to be reserved"); 1694 unsigned BCOffset = DarwinBCHeaderSize; 1695 unsigned BCSize = Buffer.size()-DarwinBCHeaderSize; 1696 1697 // Write the magic and version. 1698 unsigned Position = 0; 1699 WriteInt32ToBuffer(0x0B17C0DE , Buffer, Position); 1700 WriteInt32ToBuffer(0 , Buffer, Position); // Version. 1701 WriteInt32ToBuffer(BCOffset , Buffer, Position); 1702 WriteInt32ToBuffer(BCSize , Buffer, Position); 1703 WriteInt32ToBuffer(CPUType , Buffer, Position); 1704 1705 // If the file is not a multiple of 16 bytes, insert dummy padding. 1706 while (Buffer.size() & 15) 1707 Buffer.push_back(0); 1708} 1709 1710/// WriteBitcodeToFile - Write the specified module to the specified output 1711/// stream. 1712void llvm_2_9_func::WriteBitcodeToFile(const Module *M, raw_ostream &Out) { 1713 SmallVector<char, 1024> Buffer; 1714 Buffer.reserve(256*1024); 1715 1716 // If this is darwin or another generic macho target, reserve space for the 1717 // header. 1718 Triple TT(M->getTargetTriple()); 1719 if (TT.isOSDarwin()) 1720 Buffer.insert(Buffer.begin(), DarwinBCHeaderSize, 0); 1721 1722 // Emit the module into the buffer. 1723 { 1724 BitstreamWriter Stream(Buffer); 1725 1726 // Emit the file header. 1727 Stream.Emit((unsigned)'B', 8); 1728 Stream.Emit((unsigned)'C', 8); 1729 Stream.Emit(0x0, 4); 1730 Stream.Emit(0xC, 4); 1731 Stream.Emit(0xE, 4); 1732 Stream.Emit(0xD, 4); 1733 1734 // Emit the module. 1735 WriteModule(M, Stream); 1736 } 1737 1738 if (TT.isOSDarwin()) 1739 EmitDarwinBCHeaderAndTrailer(Buffer, TT); 1740 1741 // Write the generated bitstream to "Out". 1742 Out.write((char*)&Buffer.front(), Buffer.size()); 1743} 1744