BitcodeWriter.cpp revision be1f993f2d1d064de4451cb6d049304a3314d5c6
1//===--- Bitcode/Writer/BitcodeWriter.cpp - Bitcode Writer ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file was developed by Chris Lattner and is distributed under 6// the University of Illinois Open Source License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// Bitcode writer implementation. 11// 12//===----------------------------------------------------------------------===// 13 14#include "llvm/Bitcode/ReaderWriter.h" 15#include "llvm/Bitcode/BitstreamWriter.h" 16#include "llvm/Bitcode/LLVMBitCodes.h" 17#include "ValueEnumerator.h" 18#include "llvm/Constants.h" 19#include "llvm/DerivedTypes.h" 20#include "llvm/Instructions.h" 21#include "llvm/Module.h" 22#include "llvm/TypeSymbolTable.h" 23#include "llvm/ValueSymbolTable.h" 24#include "llvm/Support/MathExtras.h" 25using namespace llvm; 26 27static const unsigned CurVersion = 0; 28 29static unsigned GetEncodedCastOpcode(unsigned Opcode) { 30 switch (Opcode) { 31 default: assert(0 && "Unknown cast instruction!"); 32 case Instruction::Trunc : return bitc::CAST_TRUNC; 33 case Instruction::ZExt : return bitc::CAST_ZEXT; 34 case Instruction::SExt : return bitc::CAST_SEXT; 35 case Instruction::FPToUI : return bitc::CAST_FPTOUI; 36 case Instruction::FPToSI : return bitc::CAST_FPTOSI; 37 case Instruction::UIToFP : return bitc::CAST_UITOFP; 38 case Instruction::SIToFP : return bitc::CAST_SITOFP; 39 case Instruction::FPTrunc : return bitc::CAST_FPTRUNC; 40 case Instruction::FPExt : return bitc::CAST_FPEXT; 41 case Instruction::PtrToInt: return bitc::CAST_PTRTOINT; 42 case Instruction::IntToPtr: return bitc::CAST_INTTOPTR; 43 case Instruction::BitCast : return bitc::CAST_BITCAST; 44 } 45} 46 47static unsigned GetEncodedBinaryOpcode(unsigned Opcode) { 48 switch (Opcode) { 49 default: assert(0 && "Unknown binary instruction!"); 50 case Instruction::Add: return bitc::BINOP_ADD; 51 case Instruction::Sub: return bitc::BINOP_SUB; 52 case Instruction::Mul: return bitc::BINOP_MUL; 53 case Instruction::UDiv: return bitc::BINOP_UDIV; 54 case Instruction::FDiv: 55 case Instruction::SDiv: return bitc::BINOP_SDIV; 56 case Instruction::URem: return bitc::BINOP_UREM; 57 case Instruction::FRem: 58 case Instruction::SRem: return bitc::BINOP_SREM; 59 case Instruction::Shl: return bitc::BINOP_SHL; 60 case Instruction::LShr: return bitc::BINOP_LSHR; 61 case Instruction::AShr: return bitc::BINOP_ASHR; 62 case Instruction::And: return bitc::BINOP_AND; 63 case Instruction::Or: return bitc::BINOP_OR; 64 case Instruction::Xor: return bitc::BINOP_XOR; 65 } 66} 67 68 69 70static void WriteStringRecord(unsigned Code, const std::string &Str, 71 unsigned AbbrevToUse, BitstreamWriter &Stream) { 72 SmallVector<unsigned, 64> Vals; 73 74 // Code: [strlen, strchar x N] 75 Vals.push_back(Str.size()); 76 for (unsigned i = 0, e = Str.size(); i != e; ++i) 77 Vals.push_back(Str[i]); 78 79 // Emit the finished record. 80 Stream.EmitRecord(Code, Vals, AbbrevToUse); 81} 82 83 84/// WriteTypeTable - Write out the type table for a module. 85static void WriteTypeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) { 86 const ValueEnumerator::TypeList &TypeList = VE.getTypes(); 87 88 Stream.EnterSubblock(bitc::TYPE_BLOCK_ID, 4 /*count from # abbrevs */); 89 SmallVector<uint64_t, 64> TypeVals; 90 91 // FIXME: Set up abbrevs now that we know the width of the type fields, etc. 92 93 // Emit an entry count so the reader can reserve space. 94 TypeVals.push_back(TypeList.size()); 95 Stream.EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals); 96 TypeVals.clear(); 97 98 // Loop over all of the types, emitting each in turn. 99 for (unsigned i = 0, e = TypeList.size(); i != e; ++i) { 100 const Type *T = TypeList[i].first; 101 int AbbrevToUse = 0; 102 unsigned Code = 0; 103 104 switch (T->getTypeID()) { 105 case Type::PackedStructTyID: // FIXME: Delete Type::PackedStructTyID. 106 default: assert(0 && "Unknown type!"); 107 case Type::VoidTyID: Code = bitc::TYPE_CODE_VOID; break; 108 case Type::FloatTyID: Code = bitc::TYPE_CODE_FLOAT; break; 109 case Type::DoubleTyID: Code = bitc::TYPE_CODE_DOUBLE; break; 110 case Type::LabelTyID: Code = bitc::TYPE_CODE_LABEL; break; 111 case Type::OpaqueTyID: Code = bitc::TYPE_CODE_OPAQUE; break; 112 case Type::IntegerTyID: 113 // INTEGER: [width] 114 Code = bitc::TYPE_CODE_INTEGER; 115 TypeVals.push_back(cast<IntegerType>(T)->getBitWidth()); 116 break; 117 case Type::PointerTyID: 118 // POINTER: [pointee type] 119 Code = bitc::TYPE_CODE_POINTER; 120 TypeVals.push_back(VE.getTypeID(cast<PointerType>(T)->getElementType())); 121 break; 122 123 case Type::FunctionTyID: { 124 const FunctionType *FT = cast<FunctionType>(T); 125 // FUNCTION: [isvararg, #pararms, paramty x N] 126 Code = bitc::TYPE_CODE_FUNCTION; 127 TypeVals.push_back(FT->isVarArg()); 128 TypeVals.push_back(VE.getTypeID(FT->getReturnType())); 129 // FIXME: PARAM ATTR ID! 130 TypeVals.push_back(FT->getNumParams()); 131 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) 132 TypeVals.push_back(VE.getTypeID(FT->getParamType(i))); 133 break; 134 } 135 case Type::StructTyID: { 136 const StructType *ST = cast<StructType>(T); 137 // STRUCT: [ispacked, #elts, eltty x N] 138 Code = bitc::TYPE_CODE_STRUCT; 139 TypeVals.push_back(ST->isPacked()); 140 TypeVals.push_back(ST->getNumElements()); 141 // Output all of the element types... 142 for (StructType::element_iterator I = ST->element_begin(), 143 E = ST->element_end(); I != E; ++I) 144 TypeVals.push_back(VE.getTypeID(*I)); 145 break; 146 } 147 case Type::ArrayTyID: { 148 const ArrayType *AT = cast<ArrayType>(T); 149 // ARRAY: [numelts, eltty] 150 Code = bitc::TYPE_CODE_ARRAY; 151 TypeVals.push_back(AT->getNumElements()); 152 TypeVals.push_back(VE.getTypeID(AT->getElementType())); 153 break; 154 } 155 case Type::VectorTyID: { 156 const VectorType *VT = cast<VectorType>(T); 157 // VECTOR [numelts, eltty] 158 Code = bitc::TYPE_CODE_VECTOR; 159 TypeVals.push_back(VT->getNumElements()); 160 TypeVals.push_back(VE.getTypeID(VT->getElementType())); 161 break; 162 } 163 } 164 165 // Emit the finished record. 166 Stream.EmitRecord(Code, TypeVals, AbbrevToUse); 167 TypeVals.clear(); 168 } 169 170 Stream.ExitBlock(); 171} 172 173static unsigned getEncodedLinkage(const GlobalValue *GV) { 174 switch (GV->getLinkage()) { 175 default: assert(0 && "Invalid linkage!"); 176 case GlobalValue::ExternalLinkage: return 0; 177 case GlobalValue::WeakLinkage: return 1; 178 case GlobalValue::AppendingLinkage: return 2; 179 case GlobalValue::InternalLinkage: return 3; 180 case GlobalValue::LinkOnceLinkage: return 4; 181 case GlobalValue::DLLImportLinkage: return 5; 182 case GlobalValue::DLLExportLinkage: return 6; 183 case GlobalValue::ExternalWeakLinkage: return 7; 184 } 185} 186 187static unsigned getEncodedVisibility(const GlobalValue *GV) { 188 switch (GV->getVisibility()) { 189 default: assert(0 && "Invalid visibility!"); 190 case GlobalValue::DefaultVisibility: return 0; 191 case GlobalValue::HiddenVisibility: return 1; 192 case GlobalValue::ProtectedVisibility: return 2; 193 } 194} 195 196// Emit top-level description of module, including target triple, inline asm, 197// descriptors for global variables, and function prototype info. 198static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE, 199 BitstreamWriter &Stream) { 200 // Emit the list of dependent libraries for the Module. 201 for (Module::lib_iterator I = M->lib_begin(), E = M->lib_end(); I != E; ++I) 202 WriteStringRecord(bitc::MODULE_CODE_DEPLIB, *I, 0/*TODO*/, Stream); 203 204 // Emit various pieces of data attached to a module. 205 if (!M->getTargetTriple().empty()) 206 WriteStringRecord(bitc::MODULE_CODE_TRIPLE, M->getTargetTriple(), 207 0/*TODO*/, Stream); 208 if (!M->getDataLayout().empty()) 209 WriteStringRecord(bitc::MODULE_CODE_DATALAYOUT, M->getDataLayout(), 210 0/*TODO*/, Stream); 211 if (!M->getModuleInlineAsm().empty()) 212 WriteStringRecord(bitc::MODULE_CODE_ASM, M->getModuleInlineAsm(), 213 0/*TODO*/, Stream); 214 215 // Emit information about sections, computing how many there are. Also 216 // compute the maximum alignment value. 217 std::map<std::string, unsigned> SectionMap; 218 unsigned MaxAlignment = 0; 219 unsigned MaxGlobalType = 0; 220 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end(); 221 GV != E; ++GV) { 222 MaxAlignment = std::max(MaxAlignment, GV->getAlignment()); 223 MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV->getType())); 224 225 if (!GV->hasSection()) continue; 226 // Give section names unique ID's. 227 unsigned &Entry = SectionMap[GV->getSection()]; 228 if (Entry != 0) continue; 229 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, GV->getSection(), 230 0/*TODO*/, Stream); 231 Entry = SectionMap.size(); 232 } 233 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) { 234 MaxAlignment = std::max(MaxAlignment, F->getAlignment()); 235 if (!F->hasSection()) continue; 236 // Give section names unique ID's. 237 unsigned &Entry = SectionMap[F->getSection()]; 238 if (Entry != 0) continue; 239 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, F->getSection(), 240 0/*TODO*/, Stream); 241 Entry = SectionMap.size(); 242 } 243 244 // Emit abbrev for globals, now that we know # sections and max alignment. 245 unsigned SimpleGVarAbbrev = 0; 246 if (!M->global_empty()) { 247 // Add an abbrev for common globals with no visibility or thread localness. 248 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 249 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR)); 250 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::FixedWidth, 251 Log2_32_Ceil(MaxGlobalType+1))); 252 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::FixedWidth, 1)); // Constant. 253 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer. 254 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::FixedWidth, 3)); // Linkage. 255 if (MaxAlignment == 0) // Alignment. 256 Abbv->Add(BitCodeAbbrevOp(0)); 257 else { 258 unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1; 259 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::FixedWidth, 260 Log2_32_Ceil(MaxEncAlignment+1))); 261 } 262 if (SectionMap.empty()) // Section. 263 Abbv->Add(BitCodeAbbrevOp(0)); 264 else 265 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::FixedWidth, 266 Log2_32_Ceil(SectionMap.size()+1))); 267 // Don't bother emitting vis + thread local. 268 SimpleGVarAbbrev = Stream.EmitAbbrev(Abbv); 269 } 270 271 // Emit the global variable information. 272 SmallVector<unsigned, 64> Vals; 273 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end(); 274 GV != E; ++GV) { 275 unsigned AbbrevToUse = 0; 276 277 // GLOBALVAR: [type, isconst, initid, 278 // linkage, alignment, section, visibility, threadlocal] 279 Vals.push_back(VE.getTypeID(GV->getType())); 280 Vals.push_back(GV->isConstant()); 281 Vals.push_back(GV->isDeclaration() ? 0 : 282 (VE.getValueID(GV->getInitializer()) + 1)); 283 Vals.push_back(getEncodedLinkage(GV)); 284 Vals.push_back(Log2_32(GV->getAlignment())+1); 285 Vals.push_back(GV->hasSection() ? SectionMap[GV->getSection()] : 0); 286 if (GV->isThreadLocal() || 287 GV->getVisibility() != GlobalValue::DefaultVisibility) { 288 Vals.push_back(getEncodedVisibility(GV)); 289 Vals.push_back(GV->isThreadLocal()); 290 } else { 291 AbbrevToUse = SimpleGVarAbbrev; 292 } 293 294 Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse); 295 Vals.clear(); 296 } 297 298 // Emit the function proto information. 299 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) { 300 // FUNCTION: [type, callingconv, isproto, linkage, alignment, section, 301 // visibility] 302 Vals.push_back(VE.getTypeID(F->getType())); 303 Vals.push_back(F->getCallingConv()); 304 Vals.push_back(F->isDeclaration()); 305 Vals.push_back(getEncodedLinkage(F)); 306 Vals.push_back(Log2_32(F->getAlignment())+1); 307 Vals.push_back(F->hasSection() ? SectionMap[F->getSection()] : 0); 308 Vals.push_back(getEncodedVisibility(F)); 309 310 unsigned AbbrevToUse = 0; 311 Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse); 312 Vals.clear(); 313 } 314 315 316 // Emit the alias information. 317 for (Module::const_alias_iterator AI = M->alias_begin(), E = M->alias_end(); 318 AI != E; ++AI) { 319 Vals.push_back(VE.getTypeID(AI->getType())); 320 Vals.push_back(VE.getValueID(AI->getAliasee())); 321 Vals.push_back(getEncodedLinkage(AI)); 322 unsigned AbbrevToUse = 0; 323 Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse); 324 Vals.clear(); 325 } 326} 327 328 329static void WriteConstants(unsigned FirstVal, unsigned LastVal, 330 const ValueEnumerator &VE, 331 BitstreamWriter &Stream) { 332 if (FirstVal == LastVal) return; 333 334 Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 2); 335 336 // FIXME: Install and use abbrevs to reduce size. Install them globally so 337 // they don't need to be reemitted for each function body. 338 339 SmallVector<uint64_t, 64> Record; 340 341 const ValueEnumerator::ValueList &Vals = VE.getValues(); 342 const Type *LastTy = 0; 343 for (unsigned i = FirstVal; i != LastVal; ++i) { 344 const Value *V = Vals[i].first; 345 // If we need to switch types, do so now. 346 if (V->getType() != LastTy) { 347 LastTy = V->getType(); 348 Record.push_back(VE.getTypeID(LastTy)); 349 Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record); 350 Record.clear(); 351 } 352 353 if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) { 354 assert(0 && IA && "FIXME: Inline asm writing unimp!"); 355 continue; 356 } 357 const Constant *C = cast<Constant>(V); 358 unsigned Code = -1U; 359 unsigned AbbrevToUse = 0; 360 if (C->isNullValue()) { 361 Code = bitc::CST_CODE_NULL; 362 } else if (isa<UndefValue>(C)) { 363 Code = bitc::CST_CODE_UNDEF; 364 } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) { 365 if (IV->getBitWidth() <= 64) { 366 int64_t V = IV->getSExtValue(); 367 if (V >= 0) 368 Record.push_back(V << 1); 369 else 370 Record.push_back((-V << 1) | 1); 371 Code = bitc::CST_CODE_INTEGER; 372 } else { // Wide integers, > 64 bits in size. 373 // We have an arbitrary precision integer value to write whose 374 // bit width is > 64. However, in canonical unsigned integer 375 // format it is likely that the high bits are going to be zero. 376 // So, we only write the number of active words. 377 unsigned NWords = IV->getValue().getActiveWords(); 378 const uint64_t *RawWords = IV->getValue().getRawData(); 379 Record.push_back(NWords); 380 for (unsigned i = 0; i != NWords; ++i) { 381 int64_t V = RawWords[i]; 382 if (V >= 0) 383 Record.push_back(V << 1); 384 else 385 Record.push_back((-V << 1) | 1); 386 } 387 Code = bitc::CST_CODE_WIDE_INTEGER; 388 } 389 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) { 390 Code = bitc::CST_CODE_FLOAT; 391 if (CFP->getType() == Type::FloatTy) { 392 Record.push_back(FloatToBits((float)CFP->getValue())); 393 } else { 394 assert (CFP->getType() == Type::DoubleTy && "Unknown FP type!"); 395 Record.push_back(DoubleToBits((double)CFP->getValue())); 396 } 397 } else if (isa<ConstantArray>(C) || isa<ConstantStruct>(V) || 398 isa<ConstantVector>(V)) { 399 Code = bitc::CST_CODE_AGGREGATE; 400 Record.push_back(C->getNumOperands()); 401 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i) 402 Record.push_back(VE.getValueID(C->getOperand(i))); 403 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) { 404 switch (CE->getOpcode()) { 405 default: 406 if (Instruction::isCast(CE->getOpcode())) { 407 Code = bitc::CST_CODE_CE_CAST; 408 Record.push_back(GetEncodedCastOpcode(CE->getOpcode())); 409 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 410 Record.push_back(VE.getValueID(C->getOperand(0))); 411 } else { 412 assert(CE->getNumOperands() == 2 && "Unknown constant expr!"); 413 Code = bitc::CST_CODE_CE_BINOP; 414 Record.push_back(GetEncodedBinaryOpcode(CE->getOpcode())); 415 Record.push_back(VE.getValueID(C->getOperand(0))); 416 Record.push_back(VE.getValueID(C->getOperand(1))); 417 } 418 break; 419 case Instruction::GetElementPtr: 420 Code = bitc::CST_CODE_CE_GEP; 421 Record.push_back(CE->getNumOperands()); 422 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) { 423 Record.push_back(VE.getTypeID(C->getOperand(i)->getType())); 424 Record.push_back(VE.getValueID(C->getOperand(i))); 425 } 426 break; 427 case Instruction::Select: 428 Code = bitc::CST_CODE_CE_SELECT; 429 Record.push_back(VE.getValueID(C->getOperand(0))); 430 Record.push_back(VE.getValueID(C->getOperand(1))); 431 Record.push_back(VE.getValueID(C->getOperand(2))); 432 break; 433 case Instruction::ExtractElement: 434 Code = bitc::CST_CODE_CE_EXTRACTELT; 435 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 436 Record.push_back(VE.getValueID(C->getOperand(0))); 437 Record.push_back(VE.getValueID(C->getOperand(1))); 438 break; 439 case Instruction::InsertElement: 440 Code = bitc::CST_CODE_CE_INSERTELT; 441 Record.push_back(VE.getValueID(C->getOperand(0))); 442 Record.push_back(VE.getValueID(C->getOperand(1))); 443 Record.push_back(VE.getValueID(C->getOperand(2))); 444 break; 445 case Instruction::ShuffleVector: 446 Code = bitc::CST_CODE_CE_SHUFFLEVEC; 447 Record.push_back(VE.getValueID(C->getOperand(0))); 448 Record.push_back(VE.getValueID(C->getOperand(1))); 449 Record.push_back(VE.getValueID(C->getOperand(2))); 450 break; 451 case Instruction::ICmp: 452 case Instruction::FCmp: 453 Code = bitc::CST_CODE_CE_CMP; 454 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 455 Record.push_back(VE.getValueID(C->getOperand(0))); 456 Record.push_back(VE.getValueID(C->getOperand(1))); 457 Record.push_back(CE->getPredicate()); 458 break; 459 } 460 } else { 461 assert(0 && "Unknown constant!"); 462 } 463 Stream.EmitRecord(Code, Record, AbbrevToUse); 464 Record.clear(); 465 } 466 467 Stream.ExitBlock(); 468} 469 470static void WriteModuleConstants(const ValueEnumerator &VE, 471 BitstreamWriter &Stream) { 472 const ValueEnumerator::ValueList &Vals = VE.getValues(); 473 474 // Find the first constant to emit, which is the first non-globalvalue value. 475 // We know globalvalues have been emitted by WriteModuleInfo. 476 for (unsigned i = 0, e = Vals.size(); i != e; ++i) { 477 if (!isa<GlobalValue>(Vals[i].first)) { 478 WriteConstants(i, Vals.size(), VE, Stream); 479 return; 480 } 481 } 482} 483 484/// WriteInstruction - Emit an instruction to the specified stream. 485static void WriteInstruction(const Instruction &I, ValueEnumerator &VE, 486 BitstreamWriter &Stream, 487 SmallVector<unsigned, 64> &Vals) { 488 unsigned Code = 0; 489 unsigned AbbrevToUse = 0; 490 switch (I.getOpcode()) { 491 default: 492 if (Instruction::isCast(I.getOpcode())) { 493 Code = bitc::FUNC_CODE_INST_CAST; 494 Vals.push_back(GetEncodedCastOpcode(I.getOpcode())); 495 Vals.push_back(VE.getTypeID(I.getType())); 496 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 497 Vals.push_back(VE.getValueID(I.getOperand(0))); 498 } else { 499 assert(isa<BinaryOperator>(I) && "Unknown instruction!"); 500 Code = bitc::CST_CODE_CE_BINOP; 501 Vals.push_back(GetEncodedBinaryOpcode(I.getOpcode())); 502 Vals.push_back(VE.getTypeID(I.getType())); 503 Vals.push_back(VE.getValueID(I.getOperand(0))); 504 Vals.push_back(VE.getValueID(I.getOperand(1))); 505 } 506 break; 507 508 case Instruction::GetElementPtr: 509 Code = bitc::FUNC_CODE_INST_GEP; 510 Vals.push_back(I.getNumOperands()); 511 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) { 512 Vals.push_back(VE.getTypeID(I.getOperand(i)->getType())); 513 Vals.push_back(VE.getValueID(I.getOperand(i))); 514 } 515 break; 516 case Instruction::Select: 517 Code = bitc::FUNC_CODE_INST_SELECT; 518 Vals.push_back(VE.getTypeID(I.getType())); 519 Vals.push_back(VE.getValueID(I.getOperand(0))); 520 Vals.push_back(VE.getValueID(I.getOperand(1))); 521 Vals.push_back(VE.getValueID(I.getOperand(2))); 522 break; 523 case Instruction::ExtractElement: 524 Code = bitc::FUNC_CODE_INST_EXTRACTELT; 525 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 526 Vals.push_back(VE.getValueID(I.getOperand(0))); 527 Vals.push_back(VE.getValueID(I.getOperand(1))); 528 break; 529 case Instruction::InsertElement: 530 Code = bitc::FUNC_CODE_INST_INSERTELT; 531 Vals.push_back(VE.getTypeID(I.getType())); 532 Vals.push_back(VE.getValueID(I.getOperand(0))); 533 Vals.push_back(VE.getValueID(I.getOperand(1))); 534 Vals.push_back(VE.getValueID(I.getOperand(2))); 535 break; 536 case Instruction::ShuffleVector: 537 Code = bitc::FUNC_CODE_INST_SHUFFLEVEC; 538 Vals.push_back(VE.getTypeID(I.getType())); 539 Vals.push_back(VE.getValueID(I.getOperand(0))); 540 Vals.push_back(VE.getValueID(I.getOperand(1))); 541 Vals.push_back(VE.getValueID(I.getOperand(2))); 542 break; 543 case Instruction::ICmp: 544 case Instruction::FCmp: 545 Code = bitc::FUNC_CODE_INST_CMP; 546 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 547 Vals.push_back(VE.getValueID(I.getOperand(0))); 548 Vals.push_back(VE.getValueID(I.getOperand(1))); 549 Vals.push_back(cast<CmpInst>(I).getPredicate()); 550 break; 551 552 case Instruction::Ret: 553 Code = bitc::FUNC_CODE_INST_RET; 554 if (I.getNumOperands()) { 555 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 556 Vals.push_back(VE.getValueID(I.getOperand(0))); 557 } 558 break; 559 case Instruction::Br: 560 Code = bitc::FUNC_CODE_INST_BR; 561 Vals.push_back(VE.getValueID(I.getOperand(0))); 562 if (cast<BranchInst>(I).isConditional()) { 563 Vals.push_back(VE.getValueID(I.getOperand(1))); 564 Vals.push_back(VE.getValueID(I.getOperand(2))); 565 } 566 break; 567 case Instruction::Switch: 568 Code = bitc::FUNC_CODE_INST_SWITCH; 569 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 570 Vals.push_back(I.getNumOperands()); 571 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 572 Vals.push_back(VE.getValueID(I.getOperand(i))); 573 break; 574 case Instruction::Invoke: 575 Code = bitc::FUNC_CODE_INST_INVOKE; 576 // FIXME: param attrs 577 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 578 Vals.push_back(VE.getValueID(I.getOperand(0))); // callee 579 Vals.push_back(VE.getValueID(I.getOperand(1))); // normal 580 Vals.push_back(VE.getValueID(I.getOperand(2))); // unwind 581 582 // Emit value #'s for the fixed parameters. 583 const PointerType *PTy = cast<PointerType>(I.getOperand(0)->getType()); 584 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 585 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) 586 Vals.push_back(VE.getValueID(I.getOperand(i+3))); // fixed param. 587 588 // Emit type/value pairs for varargs params. 589 if (FTy->isVarArg()) { 590 unsigned NumVarargs = I.getNumOperands()-3-FTy->getNumParams(); 591 Vals.push_back(NumVarargs); 592 for (unsigned i = I.getNumOperands()-NumVarargs, e = I.getNumOperands(); 593 i != e; ++i) { 594 Vals.push_back(VE.getTypeID(I.getOperand(i)->getType())); 595 Vals.push_back(VE.getValueID(I.getOperand(i))); 596 } 597 } 598 break; 599 case Instruction::Unwind: 600 Code = bitc::FUNC_CODE_INST_UNWIND; 601 break; 602 case Instruction::Unreachable: 603 Code = bitc::FUNC_CODE_INST_UNREACHABLE; 604 break; 605 606 case Instruction::PHI: 607 Code = bitc::FUNC_CODE_INST_PHI; 608 Vals.push_back(VE.getTypeID(I.getType())); 609 Vals.push_back(I.getNumOperands()); 610 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 611 Vals.push_back(VE.getValueID(I.getOperand(i))); 612 break; 613 614 case Instruction::Malloc: 615 Code = bitc::FUNC_CODE_INST_MALLOC; 616 Vals.push_back(VE.getTypeID(I.getType())); 617 Vals.push_back(VE.getValueID(I.getOperand(0))); // size. 618 Vals.push_back(Log2_32(cast<MallocInst>(I).getAlignment())+1); 619 break; 620 621 case Instruction::Free: 622 Code = bitc::FUNC_CODE_INST_FREE; 623 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 624 Vals.push_back(VE.getValueID(I.getOperand(0))); 625 break; 626 627 case Instruction::Alloca: 628 Code = bitc::FUNC_CODE_INST_ALLOCA; 629 Vals.push_back(VE.getTypeID(I.getType())); 630 Vals.push_back(VE.getValueID(I.getOperand(0))); // size. 631 Vals.push_back(Log2_32(cast<AllocaInst>(I).getAlignment())+1); 632 break; 633 634 case Instruction::Load: 635 Code = bitc::FUNC_CODE_INST_LOAD; 636 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 637 Vals.push_back(VE.getValueID(I.getOperand(0))); // ptr. 638 Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1); 639 Vals.push_back(cast<LoadInst>(I).isVolatile()); 640 break; 641 case Instruction::Store: 642 Code = bitc::FUNC_CODE_INST_STORE; 643 Vals.push_back(VE.getTypeID(I.getOperand(1)->getType())); // Pointer 644 Vals.push_back(VE.getValueID(I.getOperand(0))); // val. 645 Vals.push_back(VE.getValueID(I.getOperand(1))); // ptr. 646 Vals.push_back(Log2_32(cast<StoreInst>(I).getAlignment())+1); 647 Vals.push_back(cast<StoreInst>(I).isVolatile()); 648 break; 649 case Instruction::Call: { 650 Code = bitc::FUNC_CODE_INST_CALL; 651 // FIXME: param attrs 652 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 653 Vals.push_back(VE.getValueID(I.getOperand(0))); // callee 654 655 // Emit value #'s for the fixed parameters. 656 const PointerType *PTy = cast<PointerType>(I.getOperand(0)->getType()); 657 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 658 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) 659 Vals.push_back(VE.getValueID(I.getOperand(i+1))); // fixed param. 660 661 // Emit type/value pairs for varargs params. 662 if (FTy->isVarArg()) { 663 unsigned NumVarargs = I.getNumOperands()-1-FTy->getNumParams(); 664 Vals.push_back(NumVarargs); 665 for (unsigned i = I.getNumOperands()-NumVarargs, e = I.getNumOperands(); 666 i != e; ++i) { 667 Vals.push_back(VE.getTypeID(I.getOperand(i)->getType())); 668 Vals.push_back(VE.getValueID(I.getOperand(i))); 669 } 670 } 671 } 672 break; 673 674 case Instruction::VAArg: 675 Code = bitc::FUNC_CODE_INST_VAARG; 676 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); // valistty 677 Vals.push_back(VE.getValueID(I.getOperand(0))); // valist. 678 Vals.push_back(VE.getTypeID(I.getType())); // restype. 679 break; 680 } 681 682 Stream.EmitRecord(Code, Vals, AbbrevToUse); 683 Vals.clear(); 684} 685 686// Emit names for globals/functions etc. 687static void WriteValueSymbolTable(const ValueSymbolTable &VST, 688 const ValueEnumerator &VE, 689 BitstreamWriter &Stream) { 690 if (VST.empty()) return; 691 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 3); 692 693 // FIXME: Set up the abbrev, we know how many values there are! 694 // FIXME: We know if the type names can use 7-bit ascii. 695 SmallVector<unsigned, 64> NameVals; 696 697 for (ValueSymbolTable::const_iterator SI = VST.begin(), SE = VST.end(); 698 SI != SE; ++SI) { 699 unsigned AbbrevToUse = 0; 700 701 // VST_ENTRY: [valueid, namelen, namechar x N] 702 NameVals.push_back(VE.getValueID(SI->getValue())); 703 704 NameVals.push_back(SI->getKeyLength()); 705 for (const char *P = SI->getKeyData(), 706 *E = SI->getKeyData()+SI->getKeyLength(); P != E; ++P) 707 NameVals.push_back((unsigned char)*P); 708 709 // Emit the finished record. 710 Stream.EmitRecord(bitc::VST_CODE_ENTRY, NameVals, AbbrevToUse); 711 NameVals.clear(); 712 } 713 Stream.ExitBlock(); 714} 715 716/// WriteFunction - Emit a function body to the module stream. 717static void WriteFunction(const Function &F, ValueEnumerator &VE, 718 BitstreamWriter &Stream) { 719 Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 3); 720 VE.incorporateFunction(F); 721 722 SmallVector<unsigned, 64> Vals; 723 724 // Emit the number of basic blocks, so the reader can create them ahead of 725 // time. 726 Vals.push_back(VE.getBasicBlocks().size()); 727 Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals); 728 Vals.clear(); 729 730 // FIXME: Function attributes? 731 732 // If there are function-local constants, emit them now. 733 unsigned CstStart, CstEnd; 734 VE.getFunctionConstantRange(CstStart, CstEnd); 735 WriteConstants(CstStart, CstEnd, VE, Stream); 736 737 // Finally, emit all the instructions, in order. 738 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) 739 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I != E; ++I) 740 WriteInstruction(*I, VE, Stream, Vals); 741 742 // Emit names for all the instructions etc. 743 WriteValueSymbolTable(F.getValueSymbolTable(), VE, Stream); 744 745 VE.purgeFunction(); 746 Stream.ExitBlock(); 747} 748 749/// WriteTypeSymbolTable - Emit a block for the specified type symtab. 750static void WriteTypeSymbolTable(const TypeSymbolTable &TST, 751 const ValueEnumerator &VE, 752 BitstreamWriter &Stream) { 753 if (TST.empty()) return; 754 755 Stream.EnterSubblock(bitc::TYPE_SYMTAB_BLOCK_ID, 3); 756 757 // FIXME: Set up the abbrev, we know how many types there are! 758 // FIXME: We know if the type names can use 7-bit ascii. 759 760 SmallVector<unsigned, 64> NameVals; 761 762 for (TypeSymbolTable::const_iterator TI = TST.begin(), TE = TST.end(); 763 TI != TE; ++TI) { 764 unsigned AbbrevToUse = 0; 765 766 // TST_ENTRY: [typeid, namelen, namechar x N] 767 NameVals.push_back(VE.getTypeID(TI->second)); 768 769 const std::string &Str = TI->first; 770 NameVals.push_back(Str.size()); 771 for (unsigned i = 0, e = Str.size(); i != e; ++i) 772 NameVals.push_back(Str[i]); 773 774 // Emit the finished record. 775 Stream.EmitRecord(bitc::VST_CODE_ENTRY, NameVals, AbbrevToUse); 776 NameVals.clear(); 777 } 778 779 Stream.ExitBlock(); 780} 781 782 783/// WriteModule - Emit the specified module to the bitstream. 784static void WriteModule(const Module *M, BitstreamWriter &Stream) { 785 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3); 786 787 // Emit the version number if it is non-zero. 788 if (CurVersion) { 789 SmallVector<unsigned, 1> Vals; 790 Vals.push_back(CurVersion); 791 Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals); 792 } 793 794 // Analyze the module, enumerating globals, functions, etc. 795 ValueEnumerator VE(M); 796 797 // Emit information describing all of the types in the module. 798 WriteTypeTable(VE, Stream); 799 800 // Emit top-level description of module, including target triple, inline asm, 801 // descriptors for global variables, and function prototype info. 802 WriteModuleInfo(M, VE, Stream); 803 804 // Emit constants. 805 WriteModuleConstants(VE, Stream); 806 807 // If we have any aggregate values in the value table, purge them - these can 808 // only be used to initialize global variables. Doing so makes the value 809 // namespace smaller for code in functions. 810 int NumNonAggregates = VE.PurgeAggregateValues(); 811 if (NumNonAggregates != -1) { 812 SmallVector<unsigned, 1> Vals; 813 Vals.push_back(NumNonAggregates); 814 Stream.EmitRecord(bitc::MODULE_CODE_PURGEVALS, Vals); 815 } 816 817 // Emit function bodies. 818 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) 819 if (!I->isDeclaration()) 820 WriteFunction(*I, VE, Stream); 821 822 // Emit the type symbol table information. 823 WriteTypeSymbolTable(M->getTypeSymbolTable(), VE, Stream); 824 825 // Emit names for globals/functions etc. 826 WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream); 827 828 Stream.ExitBlock(); 829} 830 831/// WriteBitcodeToFile - Write the specified module to the specified output 832/// stream. 833void llvm::WriteBitcodeToFile(const Module *M, std::ostream &Out) { 834 std::vector<unsigned char> Buffer; 835 BitstreamWriter Stream(Buffer); 836 837 Buffer.reserve(256*1024); 838 839 // Emit the file header. 840 Stream.Emit((unsigned)'B', 8); 841 Stream.Emit((unsigned)'C', 8); 842 Stream.Emit(0x0, 4); 843 Stream.Emit(0xC, 4); 844 Stream.Emit(0xE, 4); 845 Stream.Emit(0xD, 4); 846 847 // Emit the module. 848 WriteModule(M, Stream); 849 850 // Write the generated bitstream to "Out". 851 Out.write((char*)&Buffer.front(), Buffer.size()); 852} 853