BitcodeWriter.cpp revision 9937d116e09feb32d46a4c76eca1be6afcd3bed5
1//===--- Bitcode/Writer/BitcodeWriter.cpp - Bitcode Writer ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// Bitcode writer implementation. 11// 12//===----------------------------------------------------------------------===// 13 14#include "ReaderWriter_2_9.h" 15#include "llvm/Bitcode/BitstreamWriter.h" 16#include "llvm/Bitcode/LLVMBitCodes.h" 17#include "ValueEnumerator.h" 18#include "llvm/Constants.h" 19#include "llvm/DerivedTypes.h" 20#include "llvm/InlineAsm.h" 21#include "llvm/Instructions.h" 22#include "llvm/Module.h" 23#include "llvm/Operator.h" 24#include "llvm/ValueSymbolTable.h" 25#include "llvm/ADT/Triple.h" 26#include "llvm/Support/ErrorHandling.h" 27#include "llvm/Support/MathExtras.h" 28#include "llvm/Support/raw_ostream.h" 29#include "llvm/Support/Program.h" 30#include <cctype> 31#include <map> 32using namespace llvm; 33 34// Redefine older bitcode opcodes for use here. Note that these come from 35// LLVM 2.7 (which is what HC shipped with). 36#define METADATA_NODE_2_7 2 37#define METADATA_FN_NODE_2_7 3 38#define METADATA_NAMED_NODE_2_7 5 39#define METADATA_ATTACHMENT_2_7 7 40#define FUNC_CODE_INST_CALL_2_7 22 41#define FUNC_CODE_DEBUG_LOC_2_7 32 42 43// Redefine older bitcode opcodes for use here. Note that these come from 44// LLVM 2.7 - 3.0. 45#define TYPE_BLOCK_ID_OLD_3_0 10 46#define TYPE_SYMTAB_BLOCK_ID_OLD_3_0 13 47#define TYPE_CODE_STRUCT_OLD_3_0 10 48 49/// These are manifest constants used by the bitcode writer. They do not need to 50/// be kept in sync with the reader, but need to be consistent within this file. 51enum { 52 CurVersion = 0, 53 54 // VALUE_SYMTAB_BLOCK abbrev id's. 55 VST_ENTRY_8_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 56 VST_ENTRY_7_ABBREV, 57 VST_ENTRY_6_ABBREV, 58 VST_BBENTRY_6_ABBREV, 59 60 // CONSTANTS_BLOCK abbrev id's. 61 CONSTANTS_SETTYPE_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 62 CONSTANTS_INTEGER_ABBREV, 63 CONSTANTS_CE_CAST_Abbrev, 64 CONSTANTS_NULL_Abbrev, 65 66 // FUNCTION_BLOCK abbrev id's. 67 FUNCTION_INST_LOAD_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 68 FUNCTION_INST_BINOP_ABBREV, 69 FUNCTION_INST_BINOP_FLAGS_ABBREV, 70 FUNCTION_INST_CAST_ABBREV, 71 FUNCTION_INST_RET_VOID_ABBREV, 72 FUNCTION_INST_RET_VAL_ABBREV, 73 FUNCTION_INST_UNREACHABLE_ABBREV 74}; 75 76 77static unsigned GetEncodedCastOpcode(unsigned Opcode) { 78 switch (Opcode) { 79 default: llvm_unreachable("Unknown cast instruction!"); 80 case Instruction::Trunc : return bitc::CAST_TRUNC; 81 case Instruction::ZExt : return bitc::CAST_ZEXT; 82 case Instruction::SExt : return bitc::CAST_SEXT; 83 case Instruction::FPToUI : return bitc::CAST_FPTOUI; 84 case Instruction::FPToSI : return bitc::CAST_FPTOSI; 85 case Instruction::UIToFP : return bitc::CAST_UITOFP; 86 case Instruction::SIToFP : return bitc::CAST_SITOFP; 87 case Instruction::FPTrunc : return bitc::CAST_FPTRUNC; 88 case Instruction::FPExt : return bitc::CAST_FPEXT; 89 case Instruction::PtrToInt: return bitc::CAST_PTRTOINT; 90 case Instruction::IntToPtr: return bitc::CAST_INTTOPTR; 91 case Instruction::BitCast : return bitc::CAST_BITCAST; 92 } 93} 94 95static unsigned GetEncodedBinaryOpcode(unsigned Opcode) { 96 switch (Opcode) { 97 default: llvm_unreachable("Unknown binary instruction!"); 98 case Instruction::Add: 99 case Instruction::FAdd: return bitc::BINOP_ADD; 100 case Instruction::Sub: 101 case Instruction::FSub: return bitc::BINOP_SUB; 102 case Instruction::Mul: 103 case Instruction::FMul: return bitc::BINOP_MUL; 104 case Instruction::UDiv: return bitc::BINOP_UDIV; 105 case Instruction::FDiv: 106 case Instruction::SDiv: return bitc::BINOP_SDIV; 107 case Instruction::URem: return bitc::BINOP_UREM; 108 case Instruction::FRem: 109 case Instruction::SRem: return bitc::BINOP_SREM; 110 case Instruction::Shl: return bitc::BINOP_SHL; 111 case Instruction::LShr: return bitc::BINOP_LSHR; 112 case Instruction::AShr: return bitc::BINOP_ASHR; 113 case Instruction::And: return bitc::BINOP_AND; 114 case Instruction::Or: return bitc::BINOP_OR; 115 case Instruction::Xor: return bitc::BINOP_XOR; 116 } 117} 118 119static void WriteStringRecord(unsigned Code, StringRef Str, 120 unsigned AbbrevToUse, BitstreamWriter &Stream) { 121 SmallVector<unsigned, 64> Vals; 122 123 // Code: [strchar x N] 124 for (unsigned i = 0, e = Str.size(); i != e; ++i) { 125 if (AbbrevToUse && !BitCodeAbbrevOp::isChar6(Str[i])) 126 AbbrevToUse = 0; 127 Vals.push_back(Str[i]); 128 } 129 130 // Emit the finished record. 131 Stream.EmitRecord(Code, Vals, AbbrevToUse); 132} 133 134// Emit information about parameter attributes. 135static void WriteAttributeTable(const llvm_2_9::ValueEnumerator &VE, 136 BitstreamWriter &Stream) { 137 const std::vector<AttrListPtr> &Attrs = VE.getAttributes(); 138 if (Attrs.empty()) return; 139 140 Stream.EnterSubblock(bitc::PARAMATTR_BLOCK_ID, 3); 141 142 SmallVector<uint64_t, 64> Record; 143 for (unsigned i = 0, e = Attrs.size(); i != e; ++i) { 144 const AttrListPtr &A = Attrs[i]; 145 for (unsigned i = 0, e = A.getNumSlots(); i != e; ++i) { 146 const AttributeWithIndex &PAWI = A.getSlot(i); 147 Record.push_back(PAWI.Index); 148 149 // FIXME: remove in LLVM 3.0 150 // Store the alignment in the bitcode as a 16-bit raw value instead of a 151 // 5-bit log2 encoded value. Shift the bits above the alignment up by 152 // 11 bits. 153 uint64_t FauxAttr = PAWI.Attrs.Raw() & 0xffff; 154 if (PAWI.Attrs & Attribute::Alignment) 155 FauxAttr |= (1ull<<16)<< 156 (((PAWI.Attrs & Attribute::Alignment).Raw()-1) >> 16); 157 FauxAttr |= (PAWI.Attrs.Raw() & (0x3FFull << 21)) << 11; 158 159 Record.push_back(FauxAttr); 160 } 161 162 Stream.EmitRecord(bitc::PARAMATTR_CODE_ENTRY, Record); 163 Record.clear(); 164 } 165 166 Stream.ExitBlock(); 167} 168 169static void WriteTypeSymbolTable(const llvm_2_9::ValueEnumerator &VE, 170 BitstreamWriter &Stream) { 171 const llvm_2_9::ValueEnumerator::TypeList &TypeList = VE.getTypes(); 172 Stream.EnterSubblock(TYPE_SYMTAB_BLOCK_ID_OLD_3_0, 3); 173 174 // 7-bit fixed width VST_CODE_ENTRY strings. 175 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 176 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 177 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 178 Log2_32_Ceil(VE.getTypes().size()+1))); 179 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 180 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 181 unsigned V7Abbrev = Stream.EmitAbbrev(Abbv); 182 183 SmallVector<unsigned, 64> NameVals; 184 185 for (unsigned i = 0, e = TypeList.size(); i != e; ++i) { 186 Type *T = TypeList[i]; 187 188 switch (T->getTypeID()) { 189 case Type::StructTyID: { 190 StructType *ST = cast<StructType>(T); 191 if (ST->isLiteral()) { 192 // Skip anonymous struct definitions in type symbol table 193 // FIXME(srhines) 194 break; 195 } 196 197 // TST_ENTRY: [typeid, namechar x N] 198 NameVals.push_back(i); 199 200 const std::string &Str = ST->getName(); 201 bool is7Bit = true; 202 for (unsigned i = 0, e = Str.size(); i != e; ++i) { 203 NameVals.push_back((unsigned char)Str[i]); 204 if (Str[i] & 128) 205 is7Bit = false; 206 } 207 208 // Emit the finished record. 209 Stream.EmitRecord(bitc::VST_CODE_ENTRY, NameVals, is7Bit ? V7Abbrev : 0); 210 NameVals.clear(); 211 212 break; 213 } 214 default: break; 215 } 216 } 217 218#if 0 219 for (TypeSymbolTable::const_iterator TI = TST.begin(), TE = TST.end(); 220 TI != TE; ++TI) { 221 // TST_ENTRY: [typeid, namechar x N] 222 NameVals.push_back(VE.getTypeID(TI->second)); 223 224 const std::string &Str = TI->first; 225 bool is7Bit = true; 226 for (unsigned i = 0, e = Str.size(); i != e; ++i) { 227 NameVals.push_back((unsigned char)Str[i]); 228 if (Str[i] & 128) 229 is7Bit = false; 230 } 231 232 // Emit the finished record. 233 Stream.EmitRecord(bitc::VST_CODE_ENTRY, NameVals, is7Bit ? V7Abbrev : 0); 234 NameVals.clear(); 235 } 236#endif 237 238 Stream.ExitBlock(); 239} 240 241/// WriteTypeTable - Write out the type table for a module. 242static void WriteTypeTable(const llvm_2_9::ValueEnumerator &VE, 243 BitstreamWriter &Stream) { 244 const llvm_2_9::ValueEnumerator::TypeList &TypeList = VE.getTypes(); 245 246 Stream.EnterSubblock(TYPE_BLOCK_ID_OLD_3_0, 4 /*count from # abbrevs */); 247 SmallVector<uint64_t, 64> TypeVals; 248 249 // Abbrev for TYPE_CODE_POINTER. 250 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 251 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_POINTER)); 252 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 253 Log2_32_Ceil(VE.getTypes().size()+1))); 254 Abbv->Add(BitCodeAbbrevOp(0)); // Addrspace = 0 255 unsigned PtrAbbrev = Stream.EmitAbbrev(Abbv); 256 257 // Abbrev for TYPE_CODE_FUNCTION. 258 Abbv = new BitCodeAbbrev(); 259 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_FUNCTION_OLD)); 260 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isvararg 261 Abbv->Add(BitCodeAbbrevOp(0)); // FIXME: DEAD value, remove in LLVM 3.0 262 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 263 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 264 Log2_32_Ceil(VE.getTypes().size()+1))); 265 unsigned FunctionAbbrev = Stream.EmitAbbrev(Abbv); 266 267#if 0 268 // Abbrev for TYPE_CODE_STRUCT_ANON. 269 Abbv = new BitCodeAbbrev(); 270 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_ANON)); 271 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked 272 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 273 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 274 Log2_32_Ceil(VE.getTypes().size()+1))); 275 unsigned StructAnonAbbrev = Stream.EmitAbbrev(Abbv); 276 277 // Abbrev for TYPE_CODE_STRUCT_NAME. 278 Abbv = new BitCodeAbbrev(); 279 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAME)); 280 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 281 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 282 unsigned StructNameAbbrev = Stream.EmitAbbrev(Abbv); 283 284 // Abbrev for TYPE_CODE_STRUCT_NAMED. 285 Abbv = new BitCodeAbbrev(); 286 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAMED)); 287 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked 288 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 289 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 290 Log2_32_Ceil(VE.getTypes().size()+1))); 291 unsigned StructNamedAbbrev = Stream.EmitAbbrev(Abbv); 292#endif 293 294 // Abbrev for TYPE_CODE_STRUCT. 295 Abbv = new BitCodeAbbrev(); 296 Abbv->Add(BitCodeAbbrevOp(TYPE_CODE_STRUCT_OLD_3_0)); 297 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked 298 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 299 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 300 Log2_32_Ceil(VE.getTypes().size()+1))); 301 unsigned StructAbbrev = Stream.EmitAbbrev(Abbv); 302 303 // Abbrev for TYPE_CODE_ARRAY. 304 Abbv = new BitCodeAbbrev(); 305 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_ARRAY)); 306 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // size 307 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 308 Log2_32_Ceil(VE.getTypes().size()+1))); 309 unsigned ArrayAbbrev = Stream.EmitAbbrev(Abbv); 310 311 // Emit an entry count so the reader can reserve space. 312 TypeVals.push_back(TypeList.size()); 313 Stream.EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals); 314 TypeVals.clear(); 315 316 // Loop over all of the types, emitting each in turn. 317 for (unsigned i = 0, e = TypeList.size(); i != e; ++i) { 318 Type *T = TypeList[i]; 319 int AbbrevToUse = 0; 320 unsigned Code = 0; 321 322 switch (T->getTypeID()) { 323 default: llvm_unreachable("Unknown type!"); 324 case Type::VoidTyID: Code = bitc::TYPE_CODE_VOID; break; 325 case Type::FloatTyID: Code = bitc::TYPE_CODE_FLOAT; break; 326 case Type::DoubleTyID: Code = bitc::TYPE_CODE_DOUBLE; break; 327 case Type::X86_FP80TyID: Code = bitc::TYPE_CODE_X86_FP80; break; 328 case Type::FP128TyID: Code = bitc::TYPE_CODE_FP128; break; 329 case Type::PPC_FP128TyID: Code = bitc::TYPE_CODE_PPC_FP128; break; 330 case Type::LabelTyID: Code = bitc::TYPE_CODE_LABEL; break; 331 case Type::MetadataTyID: Code = bitc::TYPE_CODE_METADATA; break; 332 case Type::X86_MMXTyID: Code = bitc::TYPE_CODE_X86_MMX; break; 333 case Type::IntegerTyID: 334 // INTEGER: [width] 335 Code = bitc::TYPE_CODE_INTEGER; 336 TypeVals.push_back(cast<IntegerType>(T)->getBitWidth()); 337 break; 338 case Type::PointerTyID: { 339 PointerType *PTy = cast<PointerType>(T); 340 // POINTER: [pointee type, address space] 341 Code = bitc::TYPE_CODE_POINTER; 342 TypeVals.push_back(VE.getTypeID(PTy->getElementType())); 343 unsigned AddressSpace = PTy->getAddressSpace(); 344 TypeVals.push_back(AddressSpace); 345 if (AddressSpace == 0) AbbrevToUse = PtrAbbrev; 346 break; 347 } 348 case Type::FunctionTyID: { 349 FunctionType *FT = cast<FunctionType>(T); 350 // FUNCTION: [isvararg, attrid, retty, paramty x N] 351 Code = bitc::TYPE_CODE_FUNCTION_OLD; 352 TypeVals.push_back(FT->isVarArg()); 353 TypeVals.push_back(0); // FIXME: DEAD: remove in llvm 3.0 354 TypeVals.push_back(VE.getTypeID(FT->getReturnType())); 355 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) 356 TypeVals.push_back(VE.getTypeID(FT->getParamType(i))); 357 AbbrevToUse = FunctionAbbrev; 358 break; 359 } 360 case Type::StructTyID: { 361 StructType *ST = cast<StructType>(T); 362 // STRUCT: [ispacked, eltty x N] 363 TypeVals.push_back(ST->isPacked()); 364 // Output all of the element types. 365 for (StructType::element_iterator I = ST->element_begin(), 366 E = ST->element_end(); I != E; ++I) 367 TypeVals.push_back(VE.getTypeID(*I)); 368 AbbrevToUse = StructAbbrev; 369 break; 370 } 371 case Type::ArrayTyID: { 372 ArrayType *AT = cast<ArrayType>(T); 373 // ARRAY: [numelts, eltty] 374 Code = bitc::TYPE_CODE_ARRAY; 375 TypeVals.push_back(AT->getNumElements()); 376 TypeVals.push_back(VE.getTypeID(AT->getElementType())); 377 AbbrevToUse = ArrayAbbrev; 378 break; 379 } 380 case Type::VectorTyID: { 381 VectorType *VT = cast<VectorType>(T); 382 // VECTOR [numelts, eltty] 383 Code = bitc::TYPE_CODE_VECTOR; 384 TypeVals.push_back(VT->getNumElements()); 385 TypeVals.push_back(VE.getTypeID(VT->getElementType())); 386 break; 387 } 388 } 389 390 // Emit the finished record. 391 Stream.EmitRecord(Code, TypeVals, AbbrevToUse); 392 TypeVals.clear(); 393 } 394 395 Stream.ExitBlock(); 396 397 WriteTypeSymbolTable(VE, Stream); 398} 399 400static unsigned getEncodedLinkage(const GlobalValue *GV) { 401 switch (GV->getLinkage()) { 402 default: llvm_unreachable("Invalid linkage!"); 403 case GlobalValue::ExternalLinkage: return 0; 404 case GlobalValue::WeakAnyLinkage: return 1; 405 case GlobalValue::AppendingLinkage: return 2; 406 case GlobalValue::InternalLinkage: return 3; 407 case GlobalValue::LinkOnceAnyLinkage: return 4; 408 case GlobalValue::DLLImportLinkage: return 5; 409 case GlobalValue::DLLExportLinkage: return 6; 410 case GlobalValue::ExternalWeakLinkage: return 7; 411 case GlobalValue::CommonLinkage: return 8; 412 case GlobalValue::PrivateLinkage: return 9; 413 case GlobalValue::WeakODRLinkage: return 10; 414 case GlobalValue::LinkOnceODRLinkage: return 11; 415 case GlobalValue::AvailableExternallyLinkage: return 12; 416 case GlobalValue::LinkerPrivateLinkage: return 13; 417 case GlobalValue::LinkerPrivateWeakLinkage: return 14; 418 case GlobalValue::LinkerPrivateWeakDefAutoLinkage: return 15; 419 } 420} 421 422static unsigned getEncodedVisibility(const GlobalValue *GV) { 423 switch (GV->getVisibility()) { 424 default: llvm_unreachable("Invalid visibility!"); 425 case GlobalValue::DefaultVisibility: return 0; 426 case GlobalValue::HiddenVisibility: return 1; 427 case GlobalValue::ProtectedVisibility: return 2; 428 } 429} 430 431// Emit top-level description of module, including target triple, inline asm, 432// descriptors for global variables, and function prototype info. 433static void WriteModuleInfo(const Module *M, 434 const llvm_2_9::ValueEnumerator &VE, 435 BitstreamWriter &Stream) { 436 // Emit the list of dependent libraries for the Module. 437 for (Module::lib_iterator I = M->lib_begin(), E = M->lib_end(); I != E; ++I) 438 WriteStringRecord(bitc::MODULE_CODE_DEPLIB, *I, 0/*TODO*/, Stream); 439 440 // Emit various pieces of data attached to a module. 441 if (!M->getTargetTriple().empty()) 442 WriteStringRecord(bitc::MODULE_CODE_TRIPLE, M->getTargetTriple(), 443 0/*TODO*/, Stream); 444 if (!M->getDataLayout().empty()) 445 WriteStringRecord(bitc::MODULE_CODE_DATALAYOUT, M->getDataLayout(), 446 0/*TODO*/, Stream); 447 if (!M->getModuleInlineAsm().empty()) 448 WriteStringRecord(bitc::MODULE_CODE_ASM, M->getModuleInlineAsm(), 449 0/*TODO*/, Stream); 450 451 // Emit information about sections and GC, computing how many there are. Also 452 // compute the maximum alignment value. 453 std::map<std::string, unsigned> SectionMap; 454 std::map<std::string, unsigned> GCMap; 455 unsigned MaxAlignment = 0; 456 unsigned MaxGlobalType = 0; 457 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end(); 458 GV != E; ++GV) { 459 MaxAlignment = std::max(MaxAlignment, GV->getAlignment()); 460 MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV->getType())); 461 462 if (!GV->hasSection()) continue; 463 // Give section names unique ID's. 464 unsigned &Entry = SectionMap[GV->getSection()]; 465 if (Entry != 0) continue; 466 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, GV->getSection(), 467 0/*TODO*/, Stream); 468 Entry = SectionMap.size(); 469 } 470 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) { 471 MaxAlignment = std::max(MaxAlignment, F->getAlignment()); 472 if (F->hasSection()) { 473 // Give section names unique ID's. 474 unsigned &Entry = SectionMap[F->getSection()]; 475 if (!Entry) { 476 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, F->getSection(), 477 0/*TODO*/, Stream); 478 Entry = SectionMap.size(); 479 } 480 } 481 if (F->hasGC()) { 482 // Same for GC names. 483 unsigned &Entry = GCMap[F->getGC()]; 484 if (!Entry) { 485 WriteStringRecord(bitc::MODULE_CODE_GCNAME, F->getGC(), 486 0/*TODO*/, Stream); 487 Entry = GCMap.size(); 488 } 489 } 490 } 491 492 // Emit abbrev for globals, now that we know # sections and max alignment. 493 unsigned SimpleGVarAbbrev = 0; 494 if (!M->global_empty()) { 495 // Add an abbrev for common globals with no visibility or thread localness. 496 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 497 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR)); 498 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 499 Log2_32_Ceil(MaxGlobalType+1))); 500 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constant. 501 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer. 502 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // Linkage. 503 if (MaxAlignment == 0) // Alignment. 504 Abbv->Add(BitCodeAbbrevOp(0)); 505 else { 506 unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1; 507 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 508 Log2_32_Ceil(MaxEncAlignment+1))); 509 } 510 if (SectionMap.empty()) // Section. 511 Abbv->Add(BitCodeAbbrevOp(0)); 512 else 513 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 514 Log2_32_Ceil(SectionMap.size()+1))); 515 // Don't bother emitting vis + thread local. 516 SimpleGVarAbbrev = Stream.EmitAbbrev(Abbv); 517 } 518 519 // Emit the global variable information. 520 SmallVector<unsigned, 64> Vals; 521 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end(); 522 GV != E; ++GV) { 523 unsigned AbbrevToUse = 0; 524 525 // GLOBALVAR: [type, isconst, initid, 526 // linkage, alignment, section, visibility, threadlocal, 527 // unnamed_addr] 528 Vals.push_back(VE.getTypeID(GV->getType())); 529 Vals.push_back(GV->isConstant()); 530 Vals.push_back(GV->isDeclaration() ? 0 : 531 (VE.getValueID(GV->getInitializer()) + 1)); 532 Vals.push_back(getEncodedLinkage(GV)); 533 Vals.push_back(Log2_32(GV->getAlignment())+1); 534 Vals.push_back(GV->hasSection() ? SectionMap[GV->getSection()] : 0); 535 if (GV->isThreadLocal() || 536 GV->getVisibility() != GlobalValue::DefaultVisibility || 537 GV->hasUnnamedAddr()) { 538 Vals.push_back(getEncodedVisibility(GV)); 539 Vals.push_back(GV->isThreadLocal()); 540 Vals.push_back(GV->hasUnnamedAddr()); 541 } else { 542 AbbrevToUse = SimpleGVarAbbrev; 543 } 544 545 Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse); 546 Vals.clear(); 547 } 548 549 // Emit the function proto information. 550 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) { 551 // FUNCTION: [type, callingconv, isproto, paramattr, 552 // linkage, alignment, section, visibility, gc, unnamed_addr] 553 Vals.push_back(VE.getTypeID(F->getType())); 554 Vals.push_back(F->getCallingConv()); 555 Vals.push_back(F->isDeclaration()); 556 Vals.push_back(getEncodedLinkage(F)); 557 Vals.push_back(VE.getAttributeID(F->getAttributes())); 558 Vals.push_back(Log2_32(F->getAlignment())+1); 559 Vals.push_back(F->hasSection() ? SectionMap[F->getSection()] : 0); 560 Vals.push_back(getEncodedVisibility(F)); 561 Vals.push_back(F->hasGC() ? GCMap[F->getGC()] : 0); 562 Vals.push_back(F->hasUnnamedAddr()); 563 564 unsigned AbbrevToUse = 0; 565 Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse); 566 Vals.clear(); 567 } 568 569 // Emit the alias information. 570 for (Module::const_alias_iterator AI = M->alias_begin(), E = M->alias_end(); 571 AI != E; ++AI) { 572 Vals.push_back(VE.getTypeID(AI->getType())); 573 Vals.push_back(VE.getValueID(AI->getAliasee())); 574 Vals.push_back(getEncodedLinkage(AI)); 575 Vals.push_back(getEncodedVisibility(AI)); 576 unsigned AbbrevToUse = 0; 577 Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse); 578 Vals.clear(); 579 } 580} 581 582static uint64_t GetOptimizationFlags(const Value *V) { 583 uint64_t Flags = 0; 584 585 if (const OverflowingBinaryOperator *OBO = 586 dyn_cast<OverflowingBinaryOperator>(V)) { 587 if (OBO->hasNoSignedWrap()) 588 Flags |= 1 << bitc::OBO_NO_SIGNED_WRAP; 589 if (OBO->hasNoUnsignedWrap()) 590 Flags |= 1 << bitc::OBO_NO_UNSIGNED_WRAP; 591 } else if (const PossiblyExactOperator *PEO = 592 dyn_cast<PossiblyExactOperator>(V)) { 593 if (PEO->isExact()) 594 Flags |= 1 << bitc::PEO_EXACT; 595 } 596 597 return Flags; 598} 599 600static void WriteMDNode(const MDNode *N, 601 const llvm_2_9::ValueEnumerator &VE, 602 BitstreamWriter &Stream, 603 SmallVector<uint64_t, 64> &Record) { 604 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) { 605 if (N->getOperand(i)) { 606 Record.push_back(VE.getTypeID(N->getOperand(i)->getType())); 607 Record.push_back(VE.getValueID(N->getOperand(i))); 608 } else { 609 Record.push_back(VE.getTypeID(Type::getVoidTy(N->getContext()))); 610 Record.push_back(0); 611 } 612 } 613 unsigned MDCode = N->isFunctionLocal() ? METADATA_FN_NODE_2_7 : 614 METADATA_NODE_2_7; 615 Stream.EmitRecord(MDCode, Record, 0); 616 Record.clear(); 617} 618 619static void WriteModuleMetadata(const Module *M, 620 const llvm_2_9::ValueEnumerator &VE, 621 BitstreamWriter &Stream) { 622 const llvm_2_9::ValueEnumerator::ValueList &Vals = VE.getMDValues(); 623 bool StartedMetadataBlock = false; 624 unsigned MDSAbbrev = 0; 625 SmallVector<uint64_t, 64> Record; 626 for (unsigned i = 0, e = Vals.size(); i != e; ++i) { 627 628 if (const MDNode *N = dyn_cast<MDNode>(Vals[i].first)) { 629 if (!N->isFunctionLocal() || !N->getFunction()) { 630 if (!StartedMetadataBlock) { 631 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 632 StartedMetadataBlock = true; 633 } 634 WriteMDNode(N, VE, Stream, Record); 635 } 636 } else if (const MDString *MDS = dyn_cast<MDString>(Vals[i].first)) { 637 if (!StartedMetadataBlock) { 638 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 639 640 // Abbrev for METADATA_STRING. 641 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 642 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_STRING)); 643 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 644 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 645 MDSAbbrev = Stream.EmitAbbrev(Abbv); 646 StartedMetadataBlock = true; 647 } 648 649 // Code: [strchar x N] 650 Record.append(MDS->begin(), MDS->end()); 651 652 // Emit the finished record. 653 Stream.EmitRecord(bitc::METADATA_STRING, Record, MDSAbbrev); 654 Record.clear(); 655 } 656 } 657 658 // Write named metadata. 659 for (Module::const_named_metadata_iterator I = M->named_metadata_begin(), 660 E = M->named_metadata_end(); I != E; ++I) { 661 const NamedMDNode *NMD = I; 662 if (!StartedMetadataBlock) { 663 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 664 StartedMetadataBlock = true; 665 } 666 667 // Write name. 668 StringRef Str = NMD->getName(); 669 for (unsigned i = 0, e = Str.size(); i != e; ++i) 670 Record.push_back(Str[i]); 671 Stream.EmitRecord(bitc::METADATA_NAME, Record, 0/*TODO*/); 672 Record.clear(); 673 674 // Write named metadata operands. 675 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) 676 Record.push_back(VE.getValueID(NMD->getOperand(i))); 677 Stream.EmitRecord(METADATA_NAMED_NODE_2_7, Record, 0); 678 Record.clear(); 679 } 680 681 if (StartedMetadataBlock) 682 Stream.ExitBlock(); 683} 684 685static void WriteFunctionLocalMetadata(const Function &F, 686 const llvm_2_9::ValueEnumerator &VE, 687 BitstreamWriter &Stream) { 688 bool StartedMetadataBlock = false; 689 SmallVector<uint64_t, 64> Record; 690 const SmallVector<const MDNode *, 8> &Vals = VE.getFunctionLocalMDValues(); 691 for (unsigned i = 0, e = Vals.size(); i != e; ++i) 692 if (const MDNode *N = Vals[i]) 693 if (N->isFunctionLocal() && N->getFunction() == &F) { 694 if (!StartedMetadataBlock) { 695 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 696 StartedMetadataBlock = true; 697 } 698 WriteMDNode(N, VE, Stream, Record); 699 } 700 701 if (StartedMetadataBlock) 702 Stream.ExitBlock(); 703} 704 705static void WriteMetadataAttachment(const Function &F, 706 const llvm_2_9::ValueEnumerator &VE, 707 BitstreamWriter &Stream) { 708 Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3); 709 710 SmallVector<uint64_t, 64> Record; 711 712 // Write metadata attachments 713 // METADATA_ATTACHMENT - [m x [value, [n x [id, mdnode]]] 714 SmallVector<std::pair<unsigned, MDNode*>, 4> MDs; 715 716 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) 717 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); 718 I != E; ++I) { 719 MDs.clear(); 720 I->getAllMetadataOtherThanDebugLoc(MDs); 721 722 // If no metadata, ignore instruction. 723 if (MDs.empty()) continue; 724 725 Record.push_back(VE.getInstructionID(I)); 726 727 for (unsigned i = 0, e = MDs.size(); i != e; ++i) { 728 Record.push_back(MDs[i].first); 729 Record.push_back(VE.getValueID(MDs[i].second)); 730 } 731 Stream.EmitRecord(METADATA_ATTACHMENT_2_7, Record, 0); 732 Record.clear(); 733 } 734 735 Stream.ExitBlock(); 736} 737 738static void WriteModuleMetadataStore(const Module *M, BitstreamWriter &Stream) { 739 SmallVector<uint64_t, 64> Record; 740 741 // Write metadata kinds 742 // METADATA_KIND - [n x [id, name]] 743 SmallVector<StringRef, 4> Names; 744 M->getMDKindNames(Names); 745 746 if (Names.empty()) return; 747 748 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 749 750 for (unsigned MDKindID = 0, e = Names.size(); MDKindID != e; ++MDKindID) { 751 Record.push_back(MDKindID); 752 StringRef KName = Names[MDKindID]; 753 Record.append(KName.begin(), KName.end()); 754 755 Stream.EmitRecord(bitc::METADATA_KIND, Record, 0); 756 Record.clear(); 757 } 758 759 Stream.ExitBlock(); 760} 761 762static void WriteConstants(unsigned FirstVal, unsigned LastVal, 763 const llvm_2_9::ValueEnumerator &VE, 764 BitstreamWriter &Stream, bool isGlobal) { 765 if (FirstVal == LastVal) return; 766 767 Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4); 768 769 unsigned AggregateAbbrev = 0; 770 unsigned String8Abbrev = 0; 771 unsigned CString7Abbrev = 0; 772 unsigned CString6Abbrev = 0; 773 // If this is a constant pool for the module, emit module-specific abbrevs. 774 if (isGlobal) { 775 // Abbrev for CST_CODE_AGGREGATE. 776 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 777 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE)); 778 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 779 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1))); 780 AggregateAbbrev = Stream.EmitAbbrev(Abbv); 781 782 // Abbrev for CST_CODE_STRING. 783 Abbv = new BitCodeAbbrev(); 784 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING)); 785 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 786 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 787 String8Abbrev = Stream.EmitAbbrev(Abbv); 788 // Abbrev for CST_CODE_CSTRING. 789 Abbv = new BitCodeAbbrev(); 790 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING)); 791 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 792 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 793 CString7Abbrev = Stream.EmitAbbrev(Abbv); 794 // Abbrev for CST_CODE_CSTRING. 795 Abbv = new BitCodeAbbrev(); 796 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING)); 797 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 798 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 799 CString6Abbrev = Stream.EmitAbbrev(Abbv); 800 } 801 802 SmallVector<uint64_t, 64> Record; 803 804 const llvm_2_9::ValueEnumerator::ValueList &Vals = VE.getValues(); 805 Type *LastTy = 0; 806 for (unsigned i = FirstVal; i != LastVal; ++i) { 807 const Value *V = Vals[i].first; 808 // If we need to switch types, do so now. 809 if (V->getType() != LastTy) { 810 LastTy = V->getType(); 811 Record.push_back(VE.getTypeID(LastTy)); 812 Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record, 813 CONSTANTS_SETTYPE_ABBREV); 814 Record.clear(); 815 } 816 817 if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) { 818 Record.push_back(unsigned(IA->hasSideEffects()) | 819 unsigned(IA->isAlignStack()) << 1); 820 821 // Add the asm string. 822 const std::string &AsmStr = IA->getAsmString(); 823 Record.push_back(AsmStr.size()); 824 for (unsigned i = 0, e = AsmStr.size(); i != e; ++i) 825 Record.push_back(AsmStr[i]); 826 827 // Add the constraint string. 828 const std::string &ConstraintStr = IA->getConstraintString(); 829 Record.push_back(ConstraintStr.size()); 830 for (unsigned i = 0, e = ConstraintStr.size(); i != e; ++i) 831 Record.push_back(ConstraintStr[i]); 832 Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record); 833 Record.clear(); 834 continue; 835 } 836 const Constant *C = cast<Constant>(V); 837 unsigned Code = -1U; 838 unsigned AbbrevToUse = 0; 839 if (C->isNullValue()) { 840 Code = bitc::CST_CODE_NULL; 841 } else if (isa<UndefValue>(C)) { 842 Code = bitc::CST_CODE_UNDEF; 843 } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) { 844 if (IV->getBitWidth() <= 64) { 845 uint64_t V = IV->getSExtValue(); 846 if ((int64_t)V >= 0) 847 Record.push_back(V << 1); 848 else 849 Record.push_back((-V << 1) | 1); 850 Code = bitc::CST_CODE_INTEGER; 851 AbbrevToUse = CONSTANTS_INTEGER_ABBREV; 852 } else { // Wide integers, > 64 bits in size. 853 // We have an arbitrary precision integer value to write whose 854 // bit width is > 64. However, in canonical unsigned integer 855 // format it is likely that the high bits are going to be zero. 856 // So, we only write the number of active words. 857 unsigned NWords = IV->getValue().getActiveWords(); 858 const uint64_t *RawWords = IV->getValue().getRawData(); 859 for (unsigned i = 0; i != NWords; ++i) { 860 int64_t V = RawWords[i]; 861 if (V >= 0) 862 Record.push_back(V << 1); 863 else 864 Record.push_back((-V << 1) | 1); 865 } 866 Code = bitc::CST_CODE_WIDE_INTEGER; 867 } 868 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) { 869 Code = bitc::CST_CODE_FLOAT; 870 Type *Ty = CFP->getType(); 871 if (Ty->isFloatTy() || Ty->isDoubleTy()) { 872 Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue()); 873 } else if (Ty->isX86_FP80Ty()) { 874 // api needed to prevent premature destruction 875 // bits are not in the same order as a normal i80 APInt, compensate. 876 APInt api = CFP->getValueAPF().bitcastToAPInt(); 877 const uint64_t *p = api.getRawData(); 878 Record.push_back((p[1] << 48) | (p[0] >> 16)); 879 Record.push_back(p[0] & 0xffffLL); 880 } else if (Ty->isFP128Ty() || Ty->isPPC_FP128Ty()) { 881 APInt api = CFP->getValueAPF().bitcastToAPInt(); 882 const uint64_t *p = api.getRawData(); 883 Record.push_back(p[0]); 884 Record.push_back(p[1]); 885 } else { 886 assert (0 && "Unknown FP type!"); 887 } 888 } else if (isa<ConstantDataSequential>(C) && 889 cast<ConstantDataSequential>(C)->isString()) { 890 const ConstantDataSequential *Str = cast<ConstantDataSequential>(C); 891 // Emit constant strings specially. 892 unsigned NumElts = Str->getNumElements(); 893 // If this is a null-terminated string, use the denser CSTRING encoding. 894 if (Str->isCString()) { 895 Code = bitc::CST_CODE_CSTRING; 896 --NumElts; // Don't encode the null, which isn't allowed by char6. 897 } else { 898 Code = bitc::CST_CODE_STRING; 899 AbbrevToUse = String8Abbrev; 900 } 901 bool isCStr7 = Code == bitc::CST_CODE_CSTRING; 902 bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING; 903 for (unsigned i = 0; i != NumElts; ++i) { 904 unsigned char V = Str->getElementAsInteger(i); 905 Record.push_back(V); 906 isCStr7 &= (V & 128) == 0; 907 if (isCStrChar6) 908 isCStrChar6 = BitCodeAbbrevOp::isChar6(V); 909 } 910 911 if (isCStrChar6) 912 AbbrevToUse = CString6Abbrev; 913 else if (isCStr7) 914 AbbrevToUse = CString7Abbrev; 915 } else if (const ConstantDataSequential *CDS = 916 dyn_cast<ConstantDataSequential>(C)) { 917 Code = bitc::CST_CODE_DATA; 918 Type *EltTy = CDS->getType()->getElementType(); 919 if (isa<IntegerType>(EltTy)) { 920 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) 921 Record.push_back(CDS->getElementAsInteger(i)); 922 } else if (EltTy->isFloatTy()) { 923 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) { 924 union { float F; uint32_t I; }; 925 F = CDS->getElementAsFloat(i); 926 Record.push_back(I); 927 } 928 } else { 929 assert(EltTy->isDoubleTy() && "Unknown ConstantData element type"); 930 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) { 931 union { double F; uint64_t I; }; 932 F = CDS->getElementAsDouble(i); 933 Record.push_back(I); 934 } 935 } 936 } else if (isa<ConstantArray>(C) || isa<ConstantStruct>(C) || 937 isa<ConstantVector>(C)) { 938 Code = bitc::CST_CODE_AGGREGATE; 939 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i) 940 Record.push_back(VE.getValueID(C->getOperand(i))); 941 AbbrevToUse = AggregateAbbrev; 942 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) { 943 switch (CE->getOpcode()) { 944 default: 945 if (Instruction::isCast(CE->getOpcode())) { 946 Code = bitc::CST_CODE_CE_CAST; 947 Record.push_back(GetEncodedCastOpcode(CE->getOpcode())); 948 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 949 Record.push_back(VE.getValueID(C->getOperand(0))); 950 AbbrevToUse = CONSTANTS_CE_CAST_Abbrev; 951 } else { 952 assert(CE->getNumOperands() == 2 && "Unknown constant expr!"); 953 Code = bitc::CST_CODE_CE_BINOP; 954 Record.push_back(GetEncodedBinaryOpcode(CE->getOpcode())); 955 Record.push_back(VE.getValueID(C->getOperand(0))); 956 Record.push_back(VE.getValueID(C->getOperand(1))); 957 uint64_t Flags = GetOptimizationFlags(CE); 958 if (Flags != 0) 959 Record.push_back(Flags); 960 } 961 break; 962 case Instruction::GetElementPtr: 963 Code = bitc::CST_CODE_CE_GEP; 964 if (cast<GEPOperator>(C)->isInBounds()) 965 Code = bitc::CST_CODE_CE_INBOUNDS_GEP; 966 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) { 967 Record.push_back(VE.getTypeID(C->getOperand(i)->getType())); 968 Record.push_back(VE.getValueID(C->getOperand(i))); 969 } 970 break; 971 case Instruction::Select: 972 Code = bitc::CST_CODE_CE_SELECT; 973 Record.push_back(VE.getValueID(C->getOperand(0))); 974 Record.push_back(VE.getValueID(C->getOperand(1))); 975 Record.push_back(VE.getValueID(C->getOperand(2))); 976 break; 977 case Instruction::ExtractElement: 978 Code = bitc::CST_CODE_CE_EXTRACTELT; 979 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 980 Record.push_back(VE.getValueID(C->getOperand(0))); 981 Record.push_back(VE.getValueID(C->getOperand(1))); 982 break; 983 case Instruction::InsertElement: 984 Code = bitc::CST_CODE_CE_INSERTELT; 985 Record.push_back(VE.getValueID(C->getOperand(0))); 986 Record.push_back(VE.getValueID(C->getOperand(1))); 987 Record.push_back(VE.getValueID(C->getOperand(2))); 988 break; 989 case Instruction::ShuffleVector: 990 // If the return type and argument types are the same, this is a 991 // standard shufflevector instruction. If the types are different, 992 // then the shuffle is widening or truncating the input vectors, and 993 // the argument type must also be encoded. 994 if (C->getType() == C->getOperand(0)->getType()) { 995 Code = bitc::CST_CODE_CE_SHUFFLEVEC; 996 } else { 997 Code = bitc::CST_CODE_CE_SHUFVEC_EX; 998 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 999 } 1000 Record.push_back(VE.getValueID(C->getOperand(0))); 1001 Record.push_back(VE.getValueID(C->getOperand(1))); 1002 Record.push_back(VE.getValueID(C->getOperand(2))); 1003 break; 1004 case Instruction::ICmp: 1005 case Instruction::FCmp: 1006 Code = bitc::CST_CODE_CE_CMP; 1007 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 1008 Record.push_back(VE.getValueID(C->getOperand(0))); 1009 Record.push_back(VE.getValueID(C->getOperand(1))); 1010 Record.push_back(CE->getPredicate()); 1011 break; 1012 } 1013 } else if (const BlockAddress *BA = dyn_cast<BlockAddress>(C)) { 1014 Code = bitc::CST_CODE_BLOCKADDRESS; 1015 Record.push_back(VE.getTypeID(BA->getFunction()->getType())); 1016 Record.push_back(VE.getValueID(BA->getFunction())); 1017 Record.push_back(VE.getGlobalBasicBlockID(BA->getBasicBlock())); 1018 } else { 1019#ifndef NDEBUG 1020 C->dump(); 1021#endif 1022 llvm_unreachable("Unknown constant!"); 1023 } 1024 Stream.EmitRecord(Code, Record, AbbrevToUse); 1025 Record.clear(); 1026 } 1027 1028 Stream.ExitBlock(); 1029} 1030 1031static void WriteModuleConstants(const llvm_2_9::ValueEnumerator &VE, 1032 BitstreamWriter &Stream) { 1033 const llvm_2_9::ValueEnumerator::ValueList &Vals = VE.getValues(); 1034 1035 // Find the first constant to emit, which is the first non-globalvalue value. 1036 // We know globalvalues have been emitted by WriteModuleInfo. 1037 for (unsigned i = 0, e = Vals.size(); i != e; ++i) { 1038 if (!isa<GlobalValue>(Vals[i].first)) { 1039 WriteConstants(i, Vals.size(), VE, Stream, true); 1040 return; 1041 } 1042 } 1043} 1044 1045/// PushValueAndType - The file has to encode both the value and type id for 1046/// many values, because we need to know what type to create for forward 1047/// references. However, most operands are not forward references, so this type 1048/// field is not needed. 1049/// 1050/// This function adds V's value ID to Vals. If the value ID is higher than the 1051/// instruction ID, then it is a forward reference, and it also includes the 1052/// type ID. 1053static bool PushValueAndType(const Value *V, unsigned InstID, 1054 SmallVector<unsigned, 64> &Vals, 1055 llvm_2_9::ValueEnumerator &VE) { 1056 unsigned ValID = VE.getValueID(V); 1057 Vals.push_back(ValID); 1058 if (ValID >= InstID) { 1059 Vals.push_back(VE.getTypeID(V->getType())); 1060 return true; 1061 } 1062 return false; 1063} 1064 1065/// WriteInstruction - Emit an instruction to the specified stream. 1066static void WriteInstruction(const Instruction &I, unsigned InstID, 1067 llvm_2_9::ValueEnumerator &VE, 1068 BitstreamWriter &Stream, 1069 SmallVector<unsigned, 64> &Vals) { 1070 unsigned Code = 0; 1071 unsigned AbbrevToUse = 0; 1072 VE.setInstructionID(&I); 1073 switch (I.getOpcode()) { 1074 default: 1075 if (Instruction::isCast(I.getOpcode())) { 1076 Code = bitc::FUNC_CODE_INST_CAST; 1077 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 1078 AbbrevToUse = FUNCTION_INST_CAST_ABBREV; 1079 Vals.push_back(VE.getTypeID(I.getType())); 1080 Vals.push_back(GetEncodedCastOpcode(I.getOpcode())); 1081 } else { 1082 assert(isa<BinaryOperator>(I) && "Unknown instruction!"); 1083 Code = bitc::FUNC_CODE_INST_BINOP; 1084 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 1085 AbbrevToUse = FUNCTION_INST_BINOP_ABBREV; 1086 Vals.push_back(VE.getValueID(I.getOperand(1))); 1087 Vals.push_back(GetEncodedBinaryOpcode(I.getOpcode())); 1088 uint64_t Flags = GetOptimizationFlags(&I); 1089 if (Flags != 0) { 1090 if (AbbrevToUse == FUNCTION_INST_BINOP_ABBREV) 1091 AbbrevToUse = FUNCTION_INST_BINOP_FLAGS_ABBREV; 1092 Vals.push_back(Flags); 1093 } 1094 } 1095 break; 1096 1097 case Instruction::GetElementPtr: 1098 Code = bitc::FUNC_CODE_INST_GEP; 1099 if (cast<GEPOperator>(&I)->isInBounds()) 1100 Code = bitc::FUNC_CODE_INST_INBOUNDS_GEP; 1101 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 1102 PushValueAndType(I.getOperand(i), InstID, Vals, VE); 1103 break; 1104 case Instruction::ExtractValue: { 1105 Code = bitc::FUNC_CODE_INST_EXTRACTVAL; 1106 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1107 const ExtractValueInst *EVI = cast<ExtractValueInst>(&I); 1108 for (const unsigned *i = EVI->idx_begin(), *e = EVI->idx_end(); i != e; ++i) 1109 Vals.push_back(*i); 1110 break; 1111 } 1112 case Instruction::InsertValue: { 1113 Code = bitc::FUNC_CODE_INST_INSERTVAL; 1114 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1115 PushValueAndType(I.getOperand(1), InstID, Vals, VE); 1116 const InsertValueInst *IVI = cast<InsertValueInst>(&I); 1117 for (const unsigned *i = IVI->idx_begin(), *e = IVI->idx_end(); i != e; ++i) 1118 Vals.push_back(*i); 1119 break; 1120 } 1121 case Instruction::Select: 1122 Code = bitc::FUNC_CODE_INST_VSELECT; 1123 PushValueAndType(I.getOperand(1), InstID, Vals, VE); 1124 Vals.push_back(VE.getValueID(I.getOperand(2))); 1125 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1126 break; 1127 case Instruction::ExtractElement: 1128 Code = bitc::FUNC_CODE_INST_EXTRACTELT; 1129 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1130 Vals.push_back(VE.getValueID(I.getOperand(1))); 1131 break; 1132 case Instruction::InsertElement: 1133 Code = bitc::FUNC_CODE_INST_INSERTELT; 1134 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1135 Vals.push_back(VE.getValueID(I.getOperand(1))); 1136 Vals.push_back(VE.getValueID(I.getOperand(2))); 1137 break; 1138 case Instruction::ShuffleVector: 1139 Code = bitc::FUNC_CODE_INST_SHUFFLEVEC; 1140 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1141 Vals.push_back(VE.getValueID(I.getOperand(1))); 1142 Vals.push_back(VE.getValueID(I.getOperand(2))); 1143 break; 1144 case Instruction::ICmp: 1145 case Instruction::FCmp: 1146 // compare returning Int1Ty or vector of Int1Ty 1147 Code = bitc::FUNC_CODE_INST_CMP2; 1148 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1149 Vals.push_back(VE.getValueID(I.getOperand(1))); 1150 Vals.push_back(cast<CmpInst>(I).getPredicate()); 1151 break; 1152 1153 case Instruction::Ret: 1154 { 1155 Code = bitc::FUNC_CODE_INST_RET; 1156 unsigned NumOperands = I.getNumOperands(); 1157 if (NumOperands == 0) 1158 AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV; 1159 else if (NumOperands == 1) { 1160 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 1161 AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV; 1162 } else { 1163 for (unsigned i = 0, e = NumOperands; i != e; ++i) 1164 PushValueAndType(I.getOperand(i), InstID, Vals, VE); 1165 } 1166 } 1167 break; 1168 case Instruction::Br: 1169 { 1170 Code = bitc::FUNC_CODE_INST_BR; 1171 BranchInst &II = cast<BranchInst>(I); 1172 Vals.push_back(VE.getValueID(II.getSuccessor(0))); 1173 if (II.isConditional()) { 1174 Vals.push_back(VE.getValueID(II.getSuccessor(1))); 1175 Vals.push_back(VE.getValueID(II.getCondition())); 1176 } 1177 } 1178 break; 1179 case Instruction::Switch: 1180 Code = bitc::FUNC_CODE_INST_SWITCH; 1181 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 1182 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 1183 Vals.push_back(VE.getValueID(I.getOperand(i))); 1184 break; 1185 case Instruction::IndirectBr: 1186 Code = bitc::FUNC_CODE_INST_INDIRECTBR; 1187 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 1188 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 1189 Vals.push_back(VE.getValueID(I.getOperand(i))); 1190 break; 1191 1192 case Instruction::Invoke: { 1193 const InvokeInst *II = cast<InvokeInst>(&I); 1194 const Value *Callee(II->getCalledValue()); 1195 PointerType *PTy = cast<PointerType>(Callee->getType()); 1196 FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 1197 Code = bitc::FUNC_CODE_INST_INVOKE; 1198 1199 Vals.push_back(VE.getAttributeID(II->getAttributes())); 1200 Vals.push_back(II->getCallingConv()); 1201 Vals.push_back(VE.getValueID(II->getNormalDest())); 1202 Vals.push_back(VE.getValueID(II->getUnwindDest())); 1203 PushValueAndType(Callee, InstID, Vals, VE); 1204 1205 // Emit value #'s for the fixed parameters. 1206 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) 1207 Vals.push_back(VE.getValueID(I.getOperand(i))); // fixed param. 1208 1209 // Emit type/value pairs for varargs params. 1210 if (FTy->isVarArg()) { 1211 for (unsigned i = FTy->getNumParams(), e = I.getNumOperands()-3; 1212 i != e; ++i) 1213 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // vararg 1214 } 1215 break; 1216 } 1217 case Instruction::Unreachable: 1218 Code = bitc::FUNC_CODE_INST_UNREACHABLE; 1219 AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV; 1220 break; 1221 1222 case Instruction::PHI: { 1223 const PHINode &PN = cast<PHINode>(I); 1224 Code = bitc::FUNC_CODE_INST_PHI; 1225 Vals.push_back(VE.getTypeID(PN.getType())); 1226 for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i) { 1227 Vals.push_back(VE.getValueID(PN.getIncomingValue(i))); 1228 Vals.push_back(VE.getValueID(PN.getIncomingBlock(i))); 1229 } 1230 break; 1231 } 1232 1233 case Instruction::Alloca: 1234 Code = bitc::FUNC_CODE_INST_ALLOCA; 1235 Vals.push_back(VE.getTypeID(I.getType())); 1236 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 1237 Vals.push_back(VE.getValueID(I.getOperand(0))); // size. 1238 Vals.push_back(Log2_32(cast<AllocaInst>(I).getAlignment())+1); 1239 break; 1240 1241 case Instruction::Load: 1242 Code = bitc::FUNC_CODE_INST_LOAD; 1243 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) // ptr 1244 AbbrevToUse = FUNCTION_INST_LOAD_ABBREV; 1245 1246 Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1); 1247 Vals.push_back(cast<LoadInst>(I).isVolatile()); 1248 break; 1249 case Instruction::Store: 1250 Code = bitc::FUNC_CODE_INST_STORE; 1251 PushValueAndType(I.getOperand(1), InstID, Vals, VE); // ptrty + ptr 1252 Vals.push_back(VE.getValueID(I.getOperand(0))); // val. 1253 Vals.push_back(Log2_32(cast<StoreInst>(I).getAlignment())+1); 1254 Vals.push_back(cast<StoreInst>(I).isVolatile()); 1255 break; 1256 case Instruction::Call: { 1257 const CallInst &CI = cast<CallInst>(I); 1258 PointerType *PTy = cast<PointerType>(CI.getCalledValue()->getType()); 1259 FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 1260 1261 Code = FUNC_CODE_INST_CALL_2_7; 1262 1263 Vals.push_back(VE.getAttributeID(CI.getAttributes())); 1264 Vals.push_back((CI.getCallingConv() << 1) | unsigned(CI.isTailCall())); 1265 PushValueAndType(CI.getCalledValue(), InstID, Vals, VE); // Callee 1266 1267 // Emit value #'s for the fixed parameters. 1268 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) 1269 Vals.push_back(VE.getValueID(CI.getArgOperand(i))); // fixed param. 1270 1271 // Emit type/value pairs for varargs params. 1272 if (FTy->isVarArg()) { 1273 for (unsigned i = FTy->getNumParams(), e = CI.getNumArgOperands(); 1274 i != e; ++i) 1275 PushValueAndType(CI.getArgOperand(i), InstID, Vals, VE); // varargs 1276 } 1277 break; 1278 } 1279 case Instruction::VAArg: 1280 Code = bitc::FUNC_CODE_INST_VAARG; 1281 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); // valistty 1282 Vals.push_back(VE.getValueID(I.getOperand(0))); // valist. 1283 Vals.push_back(VE.getTypeID(I.getType())); // restype. 1284 break; 1285 } 1286 1287 Stream.EmitRecord(Code, Vals, AbbrevToUse); 1288 Vals.clear(); 1289} 1290 1291// Emit names for globals/functions etc. 1292static void WriteValueSymbolTable(const ValueSymbolTable &VST, 1293 const llvm_2_9::ValueEnumerator &VE, 1294 BitstreamWriter &Stream) { 1295 if (VST.empty()) return; 1296 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4); 1297 1298 // FIXME: Set up the abbrev, we know how many values there are! 1299 // FIXME: We know if the type names can use 7-bit ascii. 1300 SmallVector<unsigned, 64> NameVals; 1301 1302 for (ValueSymbolTable::const_iterator SI = VST.begin(), SE = VST.end(); 1303 SI != SE; ++SI) { 1304 1305 const ValueName &Name = *SI; 1306 1307 // Figure out the encoding to use for the name. 1308 bool is7Bit = true; 1309 bool isChar6 = true; 1310 for (const char *C = Name.getKeyData(), *E = C+Name.getKeyLength(); 1311 C != E; ++C) { 1312 if (isChar6) 1313 isChar6 = BitCodeAbbrevOp::isChar6(*C); 1314 if ((unsigned char)*C & 128) { 1315 is7Bit = false; 1316 break; // don't bother scanning the rest. 1317 } 1318 } 1319 1320 unsigned AbbrevToUse = VST_ENTRY_8_ABBREV; 1321 1322 // VST_ENTRY: [valueid, namechar x N] 1323 // VST_BBENTRY: [bbid, namechar x N] 1324 unsigned Code; 1325 if (isa<BasicBlock>(SI->getValue())) { 1326 Code = bitc::VST_CODE_BBENTRY; 1327 if (isChar6) 1328 AbbrevToUse = VST_BBENTRY_6_ABBREV; 1329 } else { 1330 Code = bitc::VST_CODE_ENTRY; 1331 if (isChar6) 1332 AbbrevToUse = VST_ENTRY_6_ABBREV; 1333 else if (is7Bit) 1334 AbbrevToUse = VST_ENTRY_7_ABBREV; 1335 } 1336 1337 NameVals.push_back(VE.getValueID(SI->getValue())); 1338 for (const char *P = Name.getKeyData(), 1339 *E = Name.getKeyData()+Name.getKeyLength(); P != E; ++P) 1340 NameVals.push_back((unsigned char)*P); 1341 1342 // Emit the finished record. 1343 Stream.EmitRecord(Code, NameVals, AbbrevToUse); 1344 NameVals.clear(); 1345 } 1346 Stream.ExitBlock(); 1347} 1348 1349/// WriteFunction - Emit a function body to the module stream. 1350static void WriteFunction(const Function &F, llvm_2_9::ValueEnumerator &VE, 1351 BitstreamWriter &Stream) { 1352 Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4); 1353 VE.incorporateFunction(F); 1354 1355 SmallVector<unsigned, 64> Vals; 1356 1357 // Emit the number of basic blocks, so the reader can create them ahead of 1358 // time. 1359 Vals.push_back(VE.getBasicBlocks().size()); 1360 Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals); 1361 Vals.clear(); 1362 1363 // If there are function-local constants, emit them now. 1364 unsigned CstStart, CstEnd; 1365 VE.getFunctionConstantRange(CstStart, CstEnd); 1366 WriteConstants(CstStart, CstEnd, VE, Stream, false); 1367 1368 // If there is function-local metadata, emit it now. 1369 WriteFunctionLocalMetadata(F, VE, Stream); 1370 1371 // Keep a running idea of what the instruction ID is. 1372 unsigned InstID = CstEnd; 1373 1374 bool NeedsMetadataAttachment = false; 1375 1376 DebugLoc LastDL; 1377 1378 // Finally, emit all the instructions, in order. 1379 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) 1380 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); 1381 I != E; ++I) { 1382 WriteInstruction(*I, InstID, VE, Stream, Vals); 1383 1384 if (!I->getType()->isVoidTy()) 1385 ++InstID; 1386 1387 // If the instruction has metadata, write a metadata attachment later. 1388 NeedsMetadataAttachment |= I->hasMetadataOtherThanDebugLoc(); 1389 1390 // If the instruction has a debug location, emit it. 1391 DebugLoc DL = I->getDebugLoc(); 1392 if (DL.isUnknown()) { 1393 // nothing todo. 1394 } else if (DL == LastDL) { 1395 // Just repeat the same debug loc as last time. 1396 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC_AGAIN, Vals); 1397 } else { 1398 MDNode *Scope, *IA; 1399 DL.getScopeAndInlinedAt(Scope, IA, I->getContext()); 1400 1401 Vals.push_back(DL.getLine()); 1402 Vals.push_back(DL.getCol()); 1403 Vals.push_back(Scope ? VE.getValueID(Scope)+1 : 0); 1404 Vals.push_back(IA ? VE.getValueID(IA)+1 : 0); 1405 Stream.EmitRecord(FUNC_CODE_DEBUG_LOC_2_7, Vals); 1406 Vals.clear(); 1407 1408 LastDL = DL; 1409 } 1410 } 1411 1412 // Emit names for all the instructions etc. 1413 WriteValueSymbolTable(F.getValueSymbolTable(), VE, Stream); 1414 1415 if (NeedsMetadataAttachment) 1416 WriteMetadataAttachment(F, VE, Stream); 1417 VE.purgeFunction(); 1418 Stream.ExitBlock(); 1419} 1420 1421// Emit blockinfo, which defines the standard abbreviations etc. 1422static void WriteBlockInfo(const llvm_2_9::ValueEnumerator &VE, 1423 BitstreamWriter &Stream) { 1424 // We only want to emit block info records for blocks that have multiple 1425 // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK. Other 1426 // blocks can defined their abbrevs inline. 1427 Stream.EnterBlockInfoBlock(2); 1428 1429 { // 8-bit fixed-width VST_ENTRY/VST_BBENTRY strings. 1430 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1431 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); 1432 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1433 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1434 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 1435 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1436 Abbv) != VST_ENTRY_8_ABBREV) 1437 llvm_unreachable("Unexpected abbrev ordering!"); 1438 } 1439 1440 { // 7-bit fixed width VST_ENTRY strings. 1441 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1442 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 1443 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1444 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1445 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 1446 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1447 Abbv) != VST_ENTRY_7_ABBREV) 1448 llvm_unreachable("Unexpected abbrev ordering!"); 1449 } 1450 { // 6-bit char6 VST_ENTRY strings. 1451 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1452 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 1453 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1454 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1455 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 1456 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1457 Abbv) != VST_ENTRY_6_ABBREV) 1458 llvm_unreachable("Unexpected abbrev ordering!"); 1459 } 1460 { // 6-bit char6 VST_BBENTRY strings. 1461 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1462 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY)); 1463 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1464 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1465 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 1466 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1467 Abbv) != VST_BBENTRY_6_ABBREV) 1468 llvm_unreachable("Unexpected abbrev ordering!"); 1469 } 1470 1471 1472 1473 { // SETTYPE abbrev for CONSTANTS_BLOCK. 1474 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1475 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE)); 1476 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1477 Log2_32_Ceil(VE.getTypes().size()+1))); 1478 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1479 Abbv) != CONSTANTS_SETTYPE_ABBREV) 1480 llvm_unreachable("Unexpected abbrev ordering!"); 1481 } 1482 1483 { // INTEGER abbrev for CONSTANTS_BLOCK. 1484 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1485 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER)); 1486 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1487 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1488 Abbv) != CONSTANTS_INTEGER_ABBREV) 1489 llvm_unreachable("Unexpected abbrev ordering!"); 1490 } 1491 1492 { // CE_CAST abbrev for CONSTANTS_BLOCK. 1493 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1494 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST)); 1495 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // cast opc 1496 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid 1497 Log2_32_Ceil(VE.getTypes().size()+1))); 1498 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id 1499 1500 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1501 Abbv) != CONSTANTS_CE_CAST_Abbrev) 1502 llvm_unreachable("Unexpected abbrev ordering!"); 1503 } 1504 { // NULL abbrev for CONSTANTS_BLOCK. 1505 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1506 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL)); 1507 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1508 Abbv) != CONSTANTS_NULL_Abbrev) 1509 llvm_unreachable("Unexpected abbrev ordering!"); 1510 } 1511 1512 // FIXME: This should only use space for first class types! 1513 1514 { // INST_LOAD abbrev for FUNCTION_BLOCK. 1515 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1516 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD)); 1517 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr 1518 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align 1519 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile 1520 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1521 Abbv) != FUNCTION_INST_LOAD_ABBREV) 1522 llvm_unreachable("Unexpected abbrev ordering!"); 1523 } 1524 { // INST_BINOP abbrev for FUNCTION_BLOCK. 1525 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1526 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP)); 1527 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS 1528 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS 1529 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1530 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1531 Abbv) != FUNCTION_INST_BINOP_ABBREV) 1532 llvm_unreachable("Unexpected abbrev ordering!"); 1533 } 1534 { // INST_BINOP_FLAGS abbrev for FUNCTION_BLOCK. 1535 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1536 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP)); 1537 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS 1538 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS 1539 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1540 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); // flags 1541 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1542 Abbv) != FUNCTION_INST_BINOP_FLAGS_ABBREV) 1543 llvm_unreachable("Unexpected abbrev ordering!"); 1544 } 1545 { // INST_CAST abbrev for FUNCTION_BLOCK. 1546 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1547 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST)); 1548 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // OpVal 1549 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty 1550 Log2_32_Ceil(VE.getTypes().size()+1))); 1551 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1552 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1553 Abbv) != FUNCTION_INST_CAST_ABBREV) 1554 llvm_unreachable("Unexpected abbrev ordering!"); 1555 } 1556 1557 { // INST_RET abbrev for FUNCTION_BLOCK. 1558 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1559 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET)); 1560 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1561 Abbv) != FUNCTION_INST_RET_VOID_ABBREV) 1562 llvm_unreachable("Unexpected abbrev ordering!"); 1563 } 1564 { // INST_RET abbrev for FUNCTION_BLOCK. 1565 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1566 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET)); 1567 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID 1568 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1569 Abbv) != FUNCTION_INST_RET_VAL_ABBREV) 1570 llvm_unreachable("Unexpected abbrev ordering!"); 1571 } 1572 { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK. 1573 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1574 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE)); 1575 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1576 Abbv) != FUNCTION_INST_UNREACHABLE_ABBREV) 1577 llvm_unreachable("Unexpected abbrev ordering!"); 1578 } 1579 1580 Stream.ExitBlock(); 1581} 1582 1583 1584/// WriteModule - Emit the specified module to the bitstream. 1585static void WriteModule(const Module *M, BitstreamWriter &Stream) { 1586 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3); 1587 1588 // Emit the version number if it is non-zero. 1589 if (CurVersion) { 1590 SmallVector<unsigned, 1> Vals; 1591 Vals.push_back(CurVersion); 1592 Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals); 1593 } 1594 1595 // Analyze the module, enumerating globals, functions, etc. 1596 llvm_2_9::ValueEnumerator VE(M); 1597 1598 // Emit blockinfo, which defines the standard abbreviations etc. 1599 WriteBlockInfo(VE, Stream); 1600 1601 // Emit information about parameter attributes. 1602 WriteAttributeTable(VE, Stream); 1603 1604 // Emit information describing all of the types in the module. 1605 WriteTypeTable(VE, Stream); 1606 1607 // Emit top-level description of module, including target triple, inline asm, 1608 // descriptors for global variables, and function prototype info. 1609 WriteModuleInfo(M, VE, Stream); 1610 1611 // Emit constants. 1612 WriteModuleConstants(VE, Stream); 1613 1614 // Emit metadata. 1615 WriteModuleMetadata(M, VE, Stream); 1616 1617 // Emit function bodies. 1618 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) 1619 if (!F->isDeclaration()) 1620 WriteFunction(*F, VE, Stream); 1621 1622 // Emit metadata. 1623 WriteModuleMetadataStore(M, Stream); 1624 1625 // Emit names for globals/functions etc. 1626 WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream); 1627 1628 Stream.ExitBlock(); 1629} 1630 1631/// EmitDarwinBCHeader - If generating a bc file on darwin, we have to emit a 1632/// header and trailer to make it compatible with the system archiver. To do 1633/// this we emit the following header, and then emit a trailer that pads the 1634/// file out to be a multiple of 16 bytes. 1635/// 1636/// struct bc_header { 1637/// uint32_t Magic; // 0x0B17C0DE 1638/// uint32_t Version; // Version, currently always 0. 1639/// uint32_t BitcodeOffset; // Offset to traditional bitcode file. 1640/// uint32_t BitcodeSize; // Size of traditional bitcode file. 1641/// uint32_t CPUType; // CPU specifier. 1642/// ... potentially more later ... 1643/// }; 1644enum { 1645 DarwinBCSizeFieldOffset = 3*4, // Offset to bitcode_size. 1646 DarwinBCHeaderSize = 5*4 1647}; 1648 1649static void WriteInt32ToBuffer(uint32_t Value, SmallVectorImpl<char> &Buffer, 1650 uint32_t &Position) { 1651 Buffer[Position + 0] = (unsigned char) (Value >> 0); 1652 Buffer[Position + 1] = (unsigned char) (Value >> 8); 1653 Buffer[Position + 2] = (unsigned char) (Value >> 16); 1654 Buffer[Position + 3] = (unsigned char) (Value >> 24); 1655 Position += 4; 1656} 1657 1658static void EmitDarwinBCHeaderAndTrailer(SmallVectorImpl<char> &Buffer, 1659 const Triple &TT) { 1660 unsigned CPUType = ~0U; 1661 1662 // Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*, arm-*, thumb-*, 1663 // armv[0-9]-*, thumbv[0-9]-*, armv5te-*, or armv6t2-*. The CPUType is a magic 1664 // number from /usr/include/mach/machine.h. It is ok to reproduce the 1665 // specific constants here because they are implicitly part of the Darwin ABI. 1666 enum { 1667 DARWIN_CPU_ARCH_ABI64 = 0x01000000, 1668 DARWIN_CPU_TYPE_X86 = 7, 1669 DARWIN_CPU_TYPE_ARM = 12, 1670 DARWIN_CPU_TYPE_POWERPC = 18 1671 }; 1672 1673 Triple::ArchType Arch = TT.getArch(); 1674 if (Arch == Triple::x86_64) 1675 CPUType = DARWIN_CPU_TYPE_X86 | DARWIN_CPU_ARCH_ABI64; 1676 else if (Arch == Triple::x86) 1677 CPUType = DARWIN_CPU_TYPE_X86; 1678 else if (Arch == Triple::ppc) 1679 CPUType = DARWIN_CPU_TYPE_POWERPC; 1680 else if (Arch == Triple::ppc64) 1681 CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64; 1682 else if (Arch == Triple::arm || Arch == Triple::thumb) 1683 CPUType = DARWIN_CPU_TYPE_ARM; 1684 1685 // Traditional Bitcode starts after header. 1686 assert(Buffer.size() >= DarwinBCHeaderSize && 1687 "Expected header size to be reserved"); 1688 unsigned BCOffset = DarwinBCHeaderSize; 1689 unsigned BCSize = Buffer.size()-DarwinBCHeaderSize; 1690 1691 // Write the magic and version. 1692 unsigned Position = 0; 1693 WriteInt32ToBuffer(0x0B17C0DE , Buffer, Position); 1694 WriteInt32ToBuffer(0 , Buffer, Position); // Version. 1695 WriteInt32ToBuffer(BCOffset , Buffer, Position); 1696 WriteInt32ToBuffer(BCSize , Buffer, Position); 1697 WriteInt32ToBuffer(CPUType , Buffer, Position); 1698 1699 // If the file is not a multiple of 16 bytes, insert dummy padding. 1700 while (Buffer.size() & 15) 1701 Buffer.push_back(0); 1702} 1703 1704/// WriteBitcodeToFile - Write the specified module to the specified output 1705/// stream. 1706void llvm_2_9::WriteBitcodeToFile(const Module *M, raw_ostream &Out) { 1707 SmallVector<char, 1024> Buffer; 1708 Buffer.reserve(256*1024); 1709 1710 // If this is darwin or another generic macho target, reserve space for the 1711 // header. 1712 Triple TT(M->getTargetTriple()); 1713 if (TT.isOSDarwin()) 1714 Buffer.insert(Buffer.begin(), DarwinBCHeaderSize, 0); 1715 1716 // Emit the module into the buffer. 1717 { 1718 BitstreamWriter Stream(Buffer); 1719 1720 // Emit the file header. 1721 Stream.Emit((unsigned)'B', 8); 1722 Stream.Emit((unsigned)'C', 8); 1723 Stream.Emit(0x0, 4); 1724 Stream.Emit(0xC, 4); 1725 Stream.Emit(0xE, 4); 1726 Stream.Emit(0xD, 4); 1727 1728 // Emit the module. 1729 WriteModule(M, Stream); 1730 } 1731 1732 if (TT.isOSDarwin()) 1733 EmitDarwinBCHeaderAndTrailer(Buffer, TT); 1734 1735 // Write the generated bitstream to "Out". 1736 Out.write((char*)&Buffer.front(), Buffer.size()); 1737} 1738