Douglas Gregor | a6b00fc | 2013-01-23 22:38:11 +0000 | [diff] [blame] | 1 | //===--- GlobalModuleIndex.cpp - Global Module Index ------------*- C++ -*-===// |
| 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 | // This file implements the GlobalModuleIndex class. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #include "ASTReaderInternals.h" |
| 15 | #include "clang/Basic/FileManager.h" |
| 16 | #include "clang/Basic/OnDiskHashTable.h" |
| 17 | #include "clang/Serialization/ASTBitCodes.h" |
| 18 | #include "clang/Serialization/GlobalModuleIndex.h" |
Douglas Gregor | fa69fc1 | 2013-03-22 18:50:14 +0000 | [diff] [blame] | 19 | #include "clang/Serialization/Module.h" |
Douglas Gregor | a6b00fc | 2013-01-23 22:38:11 +0000 | [diff] [blame] | 20 | #include "llvm/ADT/DenseMap.h" |
| 21 | #include "llvm/ADT/MapVector.h" |
| 22 | #include "llvm/ADT/SmallString.h" |
| 23 | #include "llvm/ADT/StringExtras.h" |
| 24 | #include "llvm/Bitcode/BitstreamReader.h" |
| 25 | #include "llvm/Bitcode/BitstreamWriter.h" |
Douglas Gregor | 5100135 | 2013-01-23 22:45:24 +0000 | [diff] [blame] | 26 | #include "llvm/Support/FileSystem.h" |
Douglas Gregor | a6b00fc | 2013-01-23 22:38:11 +0000 | [diff] [blame] | 27 | #include "llvm/Support/LockFileManager.h" |
| 28 | #include "llvm/Support/MemoryBuffer.h" |
Rafael Espindola | 8229d22 | 2013-06-11 22:15:02 +0000 | [diff] [blame] | 29 | #include "llvm/Support/Path.h" |
NAKAMURA Takumi | 1d32133 | 2013-01-25 01:47:07 +0000 | [diff] [blame] | 30 | #include <cstdio> |
Douglas Gregor | a6b00fc | 2013-01-23 22:38:11 +0000 | [diff] [blame] | 31 | using namespace clang; |
| 32 | using namespace serialization; |
| 33 | |
| 34 | //----------------------------------------------------------------------------// |
| 35 | // Shared constants |
| 36 | //----------------------------------------------------------------------------// |
| 37 | namespace { |
| 38 | enum { |
| 39 | /// \brief The block containing the index. |
| 40 | GLOBAL_INDEX_BLOCK_ID = llvm::bitc::FIRST_APPLICATION_BLOCKID |
| 41 | }; |
| 42 | |
| 43 | /// \brief Describes the record types in the index. |
| 44 | enum IndexRecordTypes { |
| 45 | /// \brief Contains version information and potentially other metadata, |
| 46 | /// used to determine if we can read this global index file. |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 47 | INDEX_METADATA, |
Douglas Gregor | a6b00fc | 2013-01-23 22:38:11 +0000 | [diff] [blame] | 48 | /// \brief Describes a module, including its file name and dependencies. |
| 49 | MODULE, |
| 50 | /// \brief The index for identifiers. |
| 51 | IDENTIFIER_INDEX |
| 52 | }; |
| 53 | } |
| 54 | |
| 55 | /// \brief The name of the global index file. |
| 56 | static const char * const IndexFileName = "modules.idx"; |
| 57 | |
| 58 | /// \brief The global index file version. |
| 59 | static const unsigned CurrentVersion = 1; |
| 60 | |
| 61 | //----------------------------------------------------------------------------// |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 62 | // Global module index reader. |
| 63 | //----------------------------------------------------------------------------// |
| 64 | |
| 65 | namespace { |
| 66 | |
| 67 | /// \brief Trait used to read the identifier index from the on-disk hash |
| 68 | /// table. |
| 69 | class IdentifierIndexReaderTrait { |
| 70 | public: |
| 71 | typedef StringRef external_key_type; |
| 72 | typedef StringRef internal_key_type; |
| 73 | typedef SmallVector<unsigned, 2> data_type; |
| 74 | |
| 75 | static bool EqualKey(const internal_key_type& a, const internal_key_type& b) { |
| 76 | return a == b; |
| 77 | } |
| 78 | |
| 79 | static unsigned ComputeHash(const internal_key_type& a) { |
| 80 | return llvm::HashString(a); |
| 81 | } |
| 82 | |
| 83 | static std::pair<unsigned, unsigned> |
| 84 | ReadKeyDataLength(const unsigned char*& d) { |
| 85 | using namespace clang::io; |
| 86 | unsigned KeyLen = ReadUnalignedLE16(d); |
| 87 | unsigned DataLen = ReadUnalignedLE16(d); |
| 88 | return std::make_pair(KeyLen, DataLen); |
| 89 | } |
| 90 | |
| 91 | static const internal_key_type& |
| 92 | GetInternalKey(const external_key_type& x) { return x; } |
| 93 | |
| 94 | static const external_key_type& |
| 95 | GetExternalKey(const internal_key_type& x) { return x; } |
| 96 | |
| 97 | static internal_key_type ReadKey(const unsigned char* d, unsigned n) { |
| 98 | return StringRef((const char *)d, n); |
| 99 | } |
| 100 | |
| 101 | static data_type ReadData(const internal_key_type& k, |
| 102 | const unsigned char* d, |
| 103 | unsigned DataLen) { |
| 104 | using namespace clang::io; |
| 105 | |
| 106 | data_type Result; |
| 107 | while (DataLen > 0) { |
| 108 | unsigned ID = ReadUnalignedLE32(d); |
| 109 | Result.push_back(ID); |
| 110 | DataLen -= 4; |
| 111 | } |
| 112 | |
| 113 | return Result; |
| 114 | } |
| 115 | }; |
| 116 | |
| 117 | typedef OnDiskChainedHashTable<IdentifierIndexReaderTrait> IdentifierIndexTable; |
| 118 | |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 119 | } |
| 120 | |
Douglas Gregor | 677e15f | 2013-03-19 00:28:20 +0000 | [diff] [blame] | 121 | GlobalModuleIndex::GlobalModuleIndex(llvm::MemoryBuffer *Buffer, |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 122 | llvm::BitstreamCursor Cursor) |
Douglas Gregor | fa69fc1 | 2013-03-22 18:50:14 +0000 | [diff] [blame] | 123 | : Buffer(Buffer), IdentifierIndex(), |
Douglas Gregor | 188bdcd | 2013-01-25 23:32:03 +0000 | [diff] [blame] | 124 | NumIdentifierLookups(), NumIdentifierLookupHits() |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 125 | { |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 126 | // Read the global index. |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 127 | bool InGlobalIndexBlock = false; |
| 128 | bool Done = false; |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 129 | while (!Done) { |
| 130 | llvm::BitstreamEntry Entry = Cursor.advance(); |
| 131 | |
| 132 | switch (Entry.Kind) { |
| 133 | case llvm::BitstreamEntry::Error: |
| 134 | return; |
| 135 | |
| 136 | case llvm::BitstreamEntry::EndBlock: |
| 137 | if (InGlobalIndexBlock) { |
| 138 | InGlobalIndexBlock = false; |
| 139 | Done = true; |
| 140 | continue; |
| 141 | } |
| 142 | return; |
| 143 | |
| 144 | |
| 145 | case llvm::BitstreamEntry::Record: |
| 146 | // Entries in the global index block are handled below. |
| 147 | if (InGlobalIndexBlock) |
| 148 | break; |
| 149 | |
| 150 | return; |
| 151 | |
| 152 | case llvm::BitstreamEntry::SubBlock: |
| 153 | if (!InGlobalIndexBlock && Entry.ID == GLOBAL_INDEX_BLOCK_ID) { |
| 154 | if (Cursor.EnterSubBlock(GLOBAL_INDEX_BLOCK_ID)) |
| 155 | return; |
| 156 | |
| 157 | InGlobalIndexBlock = true; |
| 158 | } else if (Cursor.SkipBlock()) { |
| 159 | return; |
| 160 | } |
| 161 | continue; |
| 162 | } |
| 163 | |
| 164 | SmallVector<uint64_t, 64> Record; |
| 165 | StringRef Blob; |
| 166 | switch ((IndexRecordTypes)Cursor.readRecord(Entry.ID, Record, &Blob)) { |
| 167 | case INDEX_METADATA: |
| 168 | // Make sure that the version matches. |
| 169 | if (Record.size() < 1 || Record[0] != CurrentVersion) |
| 170 | return; |
| 171 | break; |
| 172 | |
| 173 | case MODULE: { |
| 174 | unsigned Idx = 0; |
| 175 | unsigned ID = Record[Idx++]; |
Douglas Gregor | 677e15f | 2013-03-19 00:28:20 +0000 | [diff] [blame] | 176 | |
| 177 | // Make room for this module's information. |
| 178 | if (ID == Modules.size()) |
| 179 | Modules.push_back(ModuleInfo()); |
| 180 | else |
| 181 | Modules.resize(ID + 1); |
| 182 | |
| 183 | // Size/modification time for this module file at the time the |
| 184 | // global index was built. |
| 185 | Modules[ID].Size = Record[Idx++]; |
| 186 | Modules[ID].ModTime = Record[Idx++]; |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 187 | |
| 188 | // File name. |
| 189 | unsigned NameLen = Record[Idx++]; |
Douglas Gregor | 677e15f | 2013-03-19 00:28:20 +0000 | [diff] [blame] | 190 | Modules[ID].FileName.assign(Record.begin() + Idx, |
| 191 | Record.begin() + Idx + NameLen); |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 192 | Idx += NameLen; |
| 193 | |
| 194 | // Dependencies |
| 195 | unsigned NumDeps = Record[Idx++]; |
Douglas Gregor | 677e15f | 2013-03-19 00:28:20 +0000 | [diff] [blame] | 196 | Modules[ID].Dependencies.insert(Modules[ID].Dependencies.end(), |
| 197 | Record.begin() + Idx, |
| 198 | Record.begin() + Idx + NumDeps); |
| 199 | Idx += NumDeps; |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 200 | |
Douglas Gregor | 677e15f | 2013-03-19 00:28:20 +0000 | [diff] [blame] | 201 | // Make sure we're at the end of the record. |
| 202 | assert(Idx == Record.size() && "More module info?"); |
Douglas Gregor | fa69fc1 | 2013-03-22 18:50:14 +0000 | [diff] [blame] | 203 | |
| 204 | // Record this module as an unresolved module. |
| 205 | UnresolvedModules[llvm::sys::path::stem(Modules[ID].FileName)] = ID; |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 206 | break; |
| 207 | } |
| 208 | |
| 209 | case IDENTIFIER_INDEX: |
| 210 | // Wire up the identifier index. |
| 211 | if (Record[0]) { |
| 212 | IdentifierIndex = IdentifierIndexTable::Create( |
| 213 | (const unsigned char *)Blob.data() + Record[0], |
| 214 | (const unsigned char *)Blob.data(), |
| 215 | IdentifierIndexReaderTrait()); |
| 216 | } |
| 217 | break; |
| 218 | } |
| 219 | } |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 220 | } |
| 221 | |
| 222 | GlobalModuleIndex::~GlobalModuleIndex() { } |
| 223 | |
| 224 | std::pair<GlobalModuleIndex *, GlobalModuleIndex::ErrorCode> |
Douglas Gregor | 677e15f | 2013-03-19 00:28:20 +0000 | [diff] [blame] | 225 | GlobalModuleIndex::readIndex(StringRef Path) { |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 226 | // Load the index file, if it's there. |
| 227 | llvm::SmallString<128> IndexPath; |
| 228 | IndexPath += Path; |
| 229 | llvm::sys::path::append(IndexPath, IndexFileName); |
| 230 | |
Douglas Gregor | 677e15f | 2013-03-19 00:28:20 +0000 | [diff] [blame] | 231 | llvm::OwningPtr<llvm::MemoryBuffer> Buffer; |
| 232 | if (llvm::MemoryBuffer::getFile(IndexPath, Buffer) != llvm::errc::success) |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 233 | return std::make_pair((GlobalModuleIndex *)0, EC_NotFound); |
| 234 | |
| 235 | /// \brief The bitstream reader from which we'll read the AST file. |
| 236 | llvm::BitstreamReader Reader((const unsigned char *)Buffer->getBufferStart(), |
| 237 | (const unsigned char *)Buffer->getBufferEnd()); |
| 238 | |
| 239 | /// \brief The main bitstream cursor for the main block. |
| 240 | llvm::BitstreamCursor Cursor(Reader); |
| 241 | |
| 242 | // Sniff for the signature. |
| 243 | if (Cursor.Read(8) != 'B' || |
| 244 | Cursor.Read(8) != 'C' || |
| 245 | Cursor.Read(8) != 'G' || |
| 246 | Cursor.Read(8) != 'I') { |
| 247 | return std::make_pair((GlobalModuleIndex *)0, EC_IOError); |
| 248 | } |
| 249 | |
Douglas Gregor | 677e15f | 2013-03-19 00:28:20 +0000 | [diff] [blame] | 250 | return std::make_pair(new GlobalModuleIndex(Buffer.take(), Cursor), EC_None); |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 251 | } |
| 252 | |
Douglas Gregor | 677e15f | 2013-03-19 00:28:20 +0000 | [diff] [blame] | 253 | void |
| 254 | GlobalModuleIndex::getKnownModules(SmallVectorImpl<ModuleFile *> &ModuleFiles) { |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 255 | ModuleFiles.clear(); |
| 256 | for (unsigned I = 0, N = Modules.size(); I != N; ++I) { |
Douglas Gregor | fa69fc1 | 2013-03-22 18:50:14 +0000 | [diff] [blame] | 257 | if (ModuleFile *MF = Modules[I].File) |
| 258 | ModuleFiles.push_back(MF); |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 259 | } |
| 260 | } |
| 261 | |
| 262 | void GlobalModuleIndex::getModuleDependencies( |
Douglas Gregor | 677e15f | 2013-03-19 00:28:20 +0000 | [diff] [blame] | 263 | ModuleFile *File, |
| 264 | SmallVectorImpl<ModuleFile *> &Dependencies) { |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 265 | // Look for information about this module file. |
Douglas Gregor | 677e15f | 2013-03-19 00:28:20 +0000 | [diff] [blame] | 266 | llvm::DenseMap<ModuleFile *, unsigned>::iterator Known |
| 267 | = ModulesByFile.find(File); |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 268 | if (Known == ModulesByFile.end()) |
| 269 | return; |
| 270 | |
| 271 | // Record dependencies. |
Douglas Gregor | 677e15f | 2013-03-19 00:28:20 +0000 | [diff] [blame] | 272 | Dependencies.clear(); |
| 273 | ArrayRef<unsigned> StoredDependencies = Modules[Known->second].Dependencies; |
| 274 | for (unsigned I = 0, N = StoredDependencies.size(); I != N; ++I) { |
Douglas Gregor | fa69fc1 | 2013-03-22 18:50:14 +0000 | [diff] [blame] | 275 | if (ModuleFile *MF = Modules[I].File) |
Douglas Gregor | 677e15f | 2013-03-19 00:28:20 +0000 | [diff] [blame] | 276 | Dependencies.push_back(MF); |
| 277 | } |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 278 | } |
| 279 | |
Douglas Gregor | 188bdcd | 2013-01-25 23:32:03 +0000 | [diff] [blame] | 280 | bool GlobalModuleIndex::lookupIdentifier(StringRef Name, HitSet &Hits) { |
| 281 | Hits.clear(); |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 282 | |
| 283 | // If there's no identifier index, there is nothing we can do. |
| 284 | if (!IdentifierIndex) |
| 285 | return false; |
| 286 | |
| 287 | // Look into the identifier index. |
| 288 | ++NumIdentifierLookups; |
| 289 | IdentifierIndexTable &Table |
| 290 | = *static_cast<IdentifierIndexTable *>(IdentifierIndex); |
| 291 | IdentifierIndexTable::iterator Known = Table.find(Name); |
| 292 | if (Known == Table.end()) { |
| 293 | return true; |
| 294 | } |
| 295 | |
| 296 | SmallVector<unsigned, 2> ModuleIDs = *Known; |
| 297 | for (unsigned I = 0, N = ModuleIDs.size(); I != N; ++I) { |
Douglas Gregor | fa69fc1 | 2013-03-22 18:50:14 +0000 | [diff] [blame] | 298 | if (ModuleFile *MF = Modules[ModuleIDs[I]].File) |
| 299 | Hits.insert(MF); |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 300 | } |
| 301 | |
| 302 | ++NumIdentifierLookupHits; |
| 303 | return true; |
| 304 | } |
| 305 | |
Douglas Gregor | fa69fc1 | 2013-03-22 18:50:14 +0000 | [diff] [blame] | 306 | bool GlobalModuleIndex::loadedModuleFile(ModuleFile *File) { |
| 307 | // Look for the module in the global module index based on the module name. |
| 308 | StringRef Name = llvm::sys::path::stem(File->FileName); |
| 309 | llvm::StringMap<unsigned>::iterator Known = UnresolvedModules.find(Name); |
| 310 | if (Known == UnresolvedModules.end()) { |
| 311 | return true; |
Douglas Gregor | 677e15f | 2013-03-19 00:28:20 +0000 | [diff] [blame] | 312 | } |
| 313 | |
Douglas Gregor | fa69fc1 | 2013-03-22 18:50:14 +0000 | [diff] [blame] | 314 | // Rectify this module with the global module index. |
| 315 | ModuleInfo &Info = Modules[Known->second]; |
| 316 | |
| 317 | // If the size and modification time match what we expected, record this |
| 318 | // module file. |
| 319 | bool Failed = true; |
| 320 | if (File->File->getSize() == Info.Size && |
| 321 | File->File->getModificationTime() == Info.ModTime) { |
| 322 | Info.File = File; |
| 323 | ModulesByFile[File] = Known->second; |
| 324 | |
| 325 | Failed = false; |
Douglas Gregor | 677e15f | 2013-03-19 00:28:20 +0000 | [diff] [blame] | 326 | } |
| 327 | |
Douglas Gregor | fa69fc1 | 2013-03-22 18:50:14 +0000 | [diff] [blame] | 328 | // One way or another, we have resolved this module file. |
| 329 | UnresolvedModules.erase(Known); |
| 330 | return Failed; |
Douglas Gregor | 677e15f | 2013-03-19 00:28:20 +0000 | [diff] [blame] | 331 | } |
| 332 | |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 333 | void GlobalModuleIndex::printStats() { |
| 334 | std::fprintf(stderr, "*** Global Module Index Statistics:\n"); |
| 335 | if (NumIdentifierLookups) { |
| 336 | fprintf(stderr, " %u / %u identifier lookups succeeded (%f%%)\n", |
| 337 | NumIdentifierLookupHits, NumIdentifierLookups, |
| 338 | (double)NumIdentifierLookupHits*100.0/NumIdentifierLookups); |
| 339 | } |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 340 | std::fprintf(stderr, "\n"); |
| 341 | } |
| 342 | |
| 343 | //----------------------------------------------------------------------------// |
Douglas Gregor | a6b00fc | 2013-01-23 22:38:11 +0000 | [diff] [blame] | 344 | // Global module index writer. |
| 345 | //----------------------------------------------------------------------------// |
| 346 | |
| 347 | namespace { |
| 348 | /// \brief Provides information about a specific module file. |
| 349 | struct ModuleFileInfo { |
| 350 | /// \brief The numberic ID for this module file. |
| 351 | unsigned ID; |
| 352 | |
| 353 | /// \brief The set of modules on which this module depends. Each entry is |
| 354 | /// a module ID. |
| 355 | SmallVector<unsigned, 4> Dependencies; |
| 356 | }; |
| 357 | |
| 358 | /// \brief Builder that generates the global module index file. |
| 359 | class GlobalModuleIndexBuilder { |
| 360 | FileManager &FileMgr; |
| 361 | |
| 362 | /// \brief Mapping from files to module file information. |
| 363 | typedef llvm::MapVector<const FileEntry *, ModuleFileInfo> ModuleFilesMap; |
| 364 | |
| 365 | /// \brief Information about each of the known module files. |
| 366 | ModuleFilesMap ModuleFiles; |
| 367 | |
| 368 | /// \brief Mapping from identifiers to the list of module file IDs that |
| 369 | /// consider this identifier to be interesting. |
| 370 | typedef llvm::StringMap<SmallVector<unsigned, 2> > InterestingIdentifierMap; |
| 371 | |
| 372 | /// \brief A mapping from all interesting identifiers to the set of module |
| 373 | /// files in which those identifiers are considered interesting. |
| 374 | InterestingIdentifierMap InterestingIdentifiers; |
| 375 | |
| 376 | /// \brief Write the block-info block for the global module index file. |
| 377 | void emitBlockInfoBlock(llvm::BitstreamWriter &Stream); |
| 378 | |
| 379 | /// \brief Retrieve the module file information for the given file. |
| 380 | ModuleFileInfo &getModuleFileInfo(const FileEntry *File) { |
| 381 | llvm::MapVector<const FileEntry *, ModuleFileInfo>::iterator Known |
| 382 | = ModuleFiles.find(File); |
| 383 | if (Known != ModuleFiles.end()) |
| 384 | return Known->second; |
| 385 | |
| 386 | unsigned NewID = ModuleFiles.size(); |
| 387 | ModuleFileInfo &Info = ModuleFiles[File]; |
| 388 | Info.ID = NewID; |
| 389 | return Info; |
| 390 | } |
| 391 | |
| 392 | public: |
| 393 | explicit GlobalModuleIndexBuilder(FileManager &FileMgr) : FileMgr(FileMgr){} |
| 394 | |
| 395 | /// \brief Load the contents of the given module file into the builder. |
| 396 | /// |
| 397 | /// \returns true if an error occurred, false otherwise. |
| 398 | bool loadModuleFile(const FileEntry *File); |
| 399 | |
| 400 | /// \brief Write the index to the given bitstream. |
| 401 | void writeIndex(llvm::BitstreamWriter &Stream); |
| 402 | }; |
| 403 | } |
| 404 | |
| 405 | static void emitBlockID(unsigned ID, const char *Name, |
| 406 | llvm::BitstreamWriter &Stream, |
| 407 | SmallVectorImpl<uint64_t> &Record) { |
| 408 | Record.clear(); |
| 409 | Record.push_back(ID); |
| 410 | Stream.EmitRecord(llvm::bitc::BLOCKINFO_CODE_SETBID, Record); |
| 411 | |
| 412 | // Emit the block name if present. |
| 413 | if (Name == 0 || Name[0] == 0) return; |
| 414 | Record.clear(); |
| 415 | while (*Name) |
| 416 | Record.push_back(*Name++); |
| 417 | Stream.EmitRecord(llvm::bitc::BLOCKINFO_CODE_BLOCKNAME, Record); |
| 418 | } |
| 419 | |
| 420 | static void emitRecordID(unsigned ID, const char *Name, |
| 421 | llvm::BitstreamWriter &Stream, |
| 422 | SmallVectorImpl<uint64_t> &Record) { |
| 423 | Record.clear(); |
| 424 | Record.push_back(ID); |
| 425 | while (*Name) |
| 426 | Record.push_back(*Name++); |
| 427 | Stream.EmitRecord(llvm::bitc::BLOCKINFO_CODE_SETRECORDNAME, Record); |
| 428 | } |
| 429 | |
| 430 | void |
| 431 | GlobalModuleIndexBuilder::emitBlockInfoBlock(llvm::BitstreamWriter &Stream) { |
| 432 | SmallVector<uint64_t, 64> Record; |
| 433 | Stream.EnterSubblock(llvm::bitc::BLOCKINFO_BLOCK_ID, 3); |
| 434 | |
| 435 | #define BLOCK(X) emitBlockID(X ## _ID, #X, Stream, Record) |
| 436 | #define RECORD(X) emitRecordID(X, #X, Stream, Record) |
| 437 | BLOCK(GLOBAL_INDEX_BLOCK); |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 438 | RECORD(INDEX_METADATA); |
Douglas Gregor | a6b00fc | 2013-01-23 22:38:11 +0000 | [diff] [blame] | 439 | RECORD(MODULE); |
| 440 | RECORD(IDENTIFIER_INDEX); |
| 441 | #undef RECORD |
| 442 | #undef BLOCK |
| 443 | |
| 444 | Stream.ExitBlock(); |
| 445 | } |
| 446 | |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 447 | namespace { |
Douglas Gregor | a6b00fc | 2013-01-23 22:38:11 +0000 | [diff] [blame] | 448 | class InterestingASTIdentifierLookupTrait |
| 449 | : public serialization::reader::ASTIdentifierLookupTraitBase { |
| 450 | |
| 451 | public: |
| 452 | /// \brief The identifier and whether it is "interesting". |
| 453 | typedef std::pair<StringRef, bool> data_type; |
| 454 | |
| 455 | data_type ReadData(const internal_key_type& k, |
| 456 | const unsigned char* d, |
| 457 | unsigned DataLen) { |
| 458 | // The first bit indicates whether this identifier is interesting. |
| 459 | // That's all we care about. |
| 460 | using namespace clang::io; |
| 461 | unsigned RawID = ReadUnalignedLE32(d); |
| 462 | bool IsInteresting = RawID & 0x01; |
| 463 | return std::make_pair(k, IsInteresting); |
| 464 | } |
| 465 | }; |
| 466 | } |
| 467 | |
| 468 | bool GlobalModuleIndexBuilder::loadModuleFile(const FileEntry *File) { |
| 469 | // Open the module file. |
| 470 | OwningPtr<llvm::MemoryBuffer> Buffer; |
Douglas Gregor | 8e31d06 | 2013-02-06 18:08:37 +0000 | [diff] [blame] | 471 | std::string ErrorStr; |
| 472 | Buffer.reset(FileMgr.getBufferForFile(File, &ErrorStr, /*isVolatile=*/true)); |
Douglas Gregor | a6b00fc | 2013-01-23 22:38:11 +0000 | [diff] [blame] | 473 | if (!Buffer) { |
| 474 | return true; |
| 475 | } |
| 476 | |
| 477 | // Initialize the input stream |
| 478 | llvm::BitstreamReader InStreamFile; |
| 479 | llvm::BitstreamCursor InStream; |
| 480 | InStreamFile.init((const unsigned char *)Buffer->getBufferStart(), |
| 481 | (const unsigned char *)Buffer->getBufferEnd()); |
| 482 | InStream.init(InStreamFile); |
| 483 | |
| 484 | // Sniff for the signature. |
| 485 | if (InStream.Read(8) != 'C' || |
| 486 | InStream.Read(8) != 'P' || |
| 487 | InStream.Read(8) != 'C' || |
| 488 | InStream.Read(8) != 'H') { |
| 489 | return true; |
| 490 | } |
| 491 | |
| 492 | // Record this module file and assign it a unique ID (if it doesn't have |
| 493 | // one already). |
| 494 | unsigned ID = getModuleFileInfo(File).ID; |
| 495 | |
| 496 | // Search for the blocks and records we care about. |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 497 | enum { Other, ControlBlock, ASTBlock } State = Other; |
Douglas Gregor | a6b00fc | 2013-01-23 22:38:11 +0000 | [diff] [blame] | 498 | bool Done = false; |
| 499 | while (!Done) { |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 500 | llvm::BitstreamEntry Entry = InStream.advance(); |
Douglas Gregor | a6b00fc | 2013-01-23 22:38:11 +0000 | [diff] [blame] | 501 | switch (Entry.Kind) { |
| 502 | case llvm::BitstreamEntry::Error: |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 503 | Done = true; |
| 504 | continue; |
Douglas Gregor | a6b00fc | 2013-01-23 22:38:11 +0000 | [diff] [blame] | 505 | |
| 506 | case llvm::BitstreamEntry::Record: |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 507 | // In the 'other' state, just skip the record. We don't care. |
| 508 | if (State == Other) { |
Douglas Gregor | a6b00fc | 2013-01-23 22:38:11 +0000 | [diff] [blame] | 509 | InStream.skipRecord(Entry.ID); |
| 510 | continue; |
| 511 | } |
| 512 | |
| 513 | // Handle potentially-interesting records below. |
| 514 | break; |
| 515 | |
| 516 | case llvm::BitstreamEntry::SubBlock: |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 517 | if (Entry.ID == CONTROL_BLOCK_ID) { |
Douglas Gregor | a6b00fc | 2013-01-23 22:38:11 +0000 | [diff] [blame] | 518 | if (InStream.EnterSubBlock(CONTROL_BLOCK_ID)) |
| 519 | return true; |
| 520 | |
| 521 | // Found the control block. |
| 522 | State = ControlBlock; |
| 523 | continue; |
| 524 | } |
| 525 | |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 526 | if (Entry.ID == AST_BLOCK_ID) { |
Douglas Gregor | a6b00fc | 2013-01-23 22:38:11 +0000 | [diff] [blame] | 527 | if (InStream.EnterSubBlock(AST_BLOCK_ID)) |
| 528 | return true; |
| 529 | |
| 530 | // Found the AST block. |
| 531 | State = ASTBlock; |
| 532 | continue; |
Douglas Gregor | a6b00fc | 2013-01-23 22:38:11 +0000 | [diff] [blame] | 533 | } |
| 534 | |
| 535 | if (InStream.SkipBlock()) |
| 536 | return true; |
| 537 | |
| 538 | continue; |
| 539 | |
| 540 | case llvm::BitstreamEntry::EndBlock: |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 541 | State = Other; |
Douglas Gregor | a6b00fc | 2013-01-23 22:38:11 +0000 | [diff] [blame] | 542 | continue; |
| 543 | } |
| 544 | |
| 545 | // Read the given record. |
| 546 | SmallVector<uint64_t, 64> Record; |
| 547 | StringRef Blob; |
| 548 | unsigned Code = InStream.readRecord(Entry.ID, Record, &Blob); |
| 549 | |
| 550 | // Handle module dependencies. |
| 551 | if (State == ControlBlock && Code == IMPORTS) { |
| 552 | // Load each of the imported PCH files. |
| 553 | unsigned Idx = 0, N = Record.size(); |
| 554 | while (Idx < N) { |
| 555 | // Read information about the AST file. |
| 556 | |
| 557 | // Skip the imported kind |
| 558 | ++Idx; |
| 559 | |
| 560 | // Skip the import location |
| 561 | ++Idx; |
| 562 | |
Douglas Gregor | 677e15f | 2013-03-19 00:28:20 +0000 | [diff] [blame] | 563 | // Load stored size/modification time. |
| 564 | off_t StoredSize = (off_t)Record[Idx++]; |
| 565 | time_t StoredModTime = (time_t)Record[Idx++]; |
| 566 | |
Douglas Gregor | a6b00fc | 2013-01-23 22:38:11 +0000 | [diff] [blame] | 567 | // Retrieve the imported file name. |
| 568 | unsigned Length = Record[Idx++]; |
| 569 | SmallString<128> ImportedFile(Record.begin() + Idx, |
| 570 | Record.begin() + Idx + Length); |
| 571 | Idx += Length; |
| 572 | |
| 573 | // Find the imported module file. |
Douglas Gregor | ea14a87 | 2013-02-08 21:27:45 +0000 | [diff] [blame] | 574 | const FileEntry *DependsOnFile |
| 575 | = FileMgr.getFile(ImportedFile, /*openFile=*/false, |
| 576 | /*cacheFailure=*/false); |
Douglas Gregor | 677e15f | 2013-03-19 00:28:20 +0000 | [diff] [blame] | 577 | if (!DependsOnFile || |
| 578 | (StoredSize != DependsOnFile->getSize()) || |
| 579 | (StoredModTime != DependsOnFile->getModificationTime())) |
Douglas Gregor | a6b00fc | 2013-01-23 22:38:11 +0000 | [diff] [blame] | 580 | return true; |
| 581 | |
| 582 | // Record the dependency. |
| 583 | unsigned DependsOnID = getModuleFileInfo(DependsOnFile).ID; |
| 584 | getModuleFileInfo(File).Dependencies.push_back(DependsOnID); |
| 585 | } |
| 586 | |
| 587 | continue; |
| 588 | } |
| 589 | |
| 590 | // Handle the identifier table |
| 591 | if (State == ASTBlock && Code == IDENTIFIER_TABLE && Record[0] > 0) { |
| 592 | typedef OnDiskChainedHashTable<InterestingASTIdentifierLookupTrait> |
| 593 | InterestingIdentifierTable; |
| 594 | llvm::OwningPtr<InterestingIdentifierTable> |
| 595 | Table(InterestingIdentifierTable::Create( |
| 596 | (const unsigned char *)Blob.data() + Record[0], |
| 597 | (const unsigned char *)Blob.data())); |
| 598 | for (InterestingIdentifierTable::data_iterator D = Table->data_begin(), |
| 599 | DEnd = Table->data_end(); |
| 600 | D != DEnd; ++D) { |
| 601 | std::pair<StringRef, bool> Ident = *D; |
| 602 | if (Ident.second) |
| 603 | InterestingIdentifiers[Ident.first].push_back(ID); |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 604 | else |
| 605 | (void)InterestingIdentifiers[Ident.first]; |
Douglas Gregor | a6b00fc | 2013-01-23 22:38:11 +0000 | [diff] [blame] | 606 | } |
| 607 | } |
| 608 | |
Douglas Gregor | a6b00fc | 2013-01-23 22:38:11 +0000 | [diff] [blame] | 609 | // We don't care about this record. |
| 610 | } |
| 611 | |
| 612 | return false; |
| 613 | } |
| 614 | |
| 615 | namespace { |
| 616 | |
| 617 | /// \brief Trait used to generate the identifier index as an on-disk hash |
| 618 | /// table. |
| 619 | class IdentifierIndexWriterTrait { |
| 620 | public: |
| 621 | typedef StringRef key_type; |
| 622 | typedef StringRef key_type_ref; |
| 623 | typedef SmallVector<unsigned, 2> data_type; |
| 624 | typedef const SmallVector<unsigned, 2> &data_type_ref; |
| 625 | |
| 626 | static unsigned ComputeHash(key_type_ref Key) { |
| 627 | return llvm::HashString(Key); |
| 628 | } |
| 629 | |
| 630 | std::pair<unsigned,unsigned> |
| 631 | EmitKeyDataLength(raw_ostream& Out, key_type_ref Key, data_type_ref Data) { |
| 632 | unsigned KeyLen = Key.size(); |
| 633 | unsigned DataLen = Data.size() * 4; |
| 634 | clang::io::Emit16(Out, KeyLen); |
| 635 | clang::io::Emit16(Out, DataLen); |
| 636 | return std::make_pair(KeyLen, DataLen); |
| 637 | } |
| 638 | |
| 639 | void EmitKey(raw_ostream& Out, key_type_ref Key, unsigned KeyLen) { |
| 640 | Out.write(Key.data(), KeyLen); |
| 641 | } |
| 642 | |
| 643 | void EmitData(raw_ostream& Out, key_type_ref Key, data_type_ref Data, |
| 644 | unsigned DataLen) { |
| 645 | for (unsigned I = 0, N = Data.size(); I != N; ++I) |
| 646 | clang::io::Emit32(Out, Data[I]); |
| 647 | } |
| 648 | }; |
| 649 | |
| 650 | } |
| 651 | |
| 652 | void GlobalModuleIndexBuilder::writeIndex(llvm::BitstreamWriter &Stream) { |
| 653 | using namespace llvm; |
| 654 | |
| 655 | // Emit the file header. |
| 656 | Stream.Emit((unsigned)'B', 8); |
| 657 | Stream.Emit((unsigned)'C', 8); |
| 658 | Stream.Emit((unsigned)'G', 8); |
| 659 | Stream.Emit((unsigned)'I', 8); |
| 660 | |
| 661 | // Write the block-info block, which describes the records in this bitcode |
| 662 | // file. |
| 663 | emitBlockInfoBlock(Stream); |
| 664 | |
| 665 | Stream.EnterSubblock(GLOBAL_INDEX_BLOCK_ID, 3); |
| 666 | |
| 667 | // Write the metadata. |
| 668 | SmallVector<uint64_t, 2> Record; |
| 669 | Record.push_back(CurrentVersion); |
Douglas Gregor | 1a49d97 | 2013-01-25 01:03:03 +0000 | [diff] [blame] | 670 | Stream.EmitRecord(INDEX_METADATA, Record); |
Douglas Gregor | a6b00fc | 2013-01-23 22:38:11 +0000 | [diff] [blame] | 671 | |
| 672 | // Write the set of known module files. |
| 673 | for (ModuleFilesMap::iterator M = ModuleFiles.begin(), |
| 674 | MEnd = ModuleFiles.end(); |
| 675 | M != MEnd; ++M) { |
| 676 | Record.clear(); |
| 677 | Record.push_back(M->second.ID); |
| 678 | Record.push_back(M->first->getSize()); |
| 679 | Record.push_back(M->first->getModificationTime()); |
| 680 | |
| 681 | // File name |
| 682 | StringRef Name(M->first->getName()); |
| 683 | Record.push_back(Name.size()); |
| 684 | Record.append(Name.begin(), Name.end()); |
| 685 | |
| 686 | // Dependencies |
| 687 | Record.push_back(M->second.Dependencies.size()); |
| 688 | Record.append(M->second.Dependencies.begin(), M->second.Dependencies.end()); |
| 689 | Stream.EmitRecord(MODULE, Record); |
| 690 | } |
| 691 | |
| 692 | // Write the identifier -> module file mapping. |
| 693 | { |
| 694 | OnDiskChainedHashTableGenerator<IdentifierIndexWriterTrait> Generator; |
| 695 | IdentifierIndexWriterTrait Trait; |
| 696 | |
| 697 | // Populate the hash table. |
| 698 | for (InterestingIdentifierMap::iterator I = InterestingIdentifiers.begin(), |
| 699 | IEnd = InterestingIdentifiers.end(); |
| 700 | I != IEnd; ++I) { |
| 701 | Generator.insert(I->first(), I->second, Trait); |
| 702 | } |
| 703 | |
| 704 | // Create the on-disk hash table in a buffer. |
| 705 | SmallString<4096> IdentifierTable; |
| 706 | uint32_t BucketOffset; |
| 707 | { |
| 708 | llvm::raw_svector_ostream Out(IdentifierTable); |
| 709 | // Make sure that no bucket is at offset 0 |
| 710 | clang::io::Emit32(Out, 0); |
| 711 | BucketOffset = Generator.Emit(Out, Trait); |
| 712 | } |
| 713 | |
| 714 | // Create a blob abbreviation |
| 715 | BitCodeAbbrev *Abbrev = new BitCodeAbbrev(); |
| 716 | Abbrev->Add(BitCodeAbbrevOp(IDENTIFIER_INDEX)); |
| 717 | Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); |
| 718 | Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); |
| 719 | unsigned IDTableAbbrev = Stream.EmitAbbrev(Abbrev); |
| 720 | |
| 721 | // Write the identifier table |
| 722 | Record.clear(); |
| 723 | Record.push_back(IDENTIFIER_INDEX); |
| 724 | Record.push_back(BucketOffset); |
| 725 | Stream.EmitRecordWithBlob(IDTableAbbrev, Record, IdentifierTable.str()); |
| 726 | } |
| 727 | |
Douglas Gregor | a6b00fc | 2013-01-23 22:38:11 +0000 | [diff] [blame] | 728 | Stream.ExitBlock(); |
| 729 | } |
| 730 | |
| 731 | GlobalModuleIndex::ErrorCode |
| 732 | GlobalModuleIndex::writeIndex(FileManager &FileMgr, StringRef Path) { |
| 733 | llvm::SmallString<128> IndexPath; |
| 734 | IndexPath += Path; |
| 735 | llvm::sys::path::append(IndexPath, IndexFileName); |
| 736 | |
| 737 | // Coordinate building the global index file with other processes that might |
| 738 | // try to do the same. |
| 739 | llvm::LockFileManager Locked(IndexPath); |
| 740 | switch (Locked) { |
| 741 | case llvm::LockFileManager::LFS_Error: |
| 742 | return EC_IOError; |
| 743 | |
| 744 | case llvm::LockFileManager::LFS_Owned: |
| 745 | // We're responsible for building the index ourselves. Do so below. |
| 746 | break; |
| 747 | |
| 748 | case llvm::LockFileManager::LFS_Shared: |
| 749 | // Someone else is responsible for building the index. We don't care |
| 750 | // when they finish, so we're done. |
| 751 | return EC_Building; |
| 752 | } |
| 753 | |
| 754 | // The module index builder. |
| 755 | GlobalModuleIndexBuilder Builder(FileMgr); |
| 756 | |
| 757 | // Load each of the module files. |
| 758 | llvm::error_code EC; |
| 759 | for (llvm::sys::fs::directory_iterator D(Path, EC), DEnd; |
| 760 | D != DEnd && !EC; |
| 761 | D.increment(EC)) { |
| 762 | // If this isn't a module file, we don't care. |
| 763 | if (llvm::sys::path::extension(D->path()) != ".pcm") { |
| 764 | // ... unless it's a .pcm.lock file, which indicates that someone is |
| 765 | // in the process of rebuilding a module. They'll rebuild the index |
| 766 | // at the end of that translation unit, so we don't have to. |
| 767 | if (llvm::sys::path::extension(D->path()) == ".pcm.lock") |
| 768 | return EC_Building; |
| 769 | |
| 770 | continue; |
| 771 | } |
| 772 | |
| 773 | // If we can't find the module file, skip it. |
| 774 | const FileEntry *ModuleFile = FileMgr.getFile(D->path()); |
| 775 | if (!ModuleFile) |
| 776 | continue; |
| 777 | |
| 778 | // Load this module file. |
| 779 | if (Builder.loadModuleFile(ModuleFile)) |
| 780 | return EC_IOError; |
| 781 | } |
| 782 | |
| 783 | // The output buffer, into which the global index will be written. |
| 784 | SmallVector<char, 16> OutputBuffer; |
| 785 | { |
| 786 | llvm::BitstreamWriter OutputStream(OutputBuffer); |
| 787 | Builder.writeIndex(OutputStream); |
| 788 | } |
| 789 | |
| 790 | // Write the global index file to a temporary file. |
| 791 | llvm::SmallString<128> IndexTmpPath; |
| 792 | int TmpFD; |
Rafael Espindola | 70e7aec | 2013-07-05 21:13:58 +0000 | [diff] [blame^] | 793 | if (llvm::sys::fs::createUniqueFile(IndexPath + "-%%%%%%%%", TmpFD, |
| 794 | IndexTmpPath)) |
Douglas Gregor | a6b00fc | 2013-01-23 22:38:11 +0000 | [diff] [blame] | 795 | return EC_IOError; |
| 796 | |
| 797 | // Open the temporary global index file for output. |
NAKAMURA Takumi | d2db16f | 2013-01-24 08:20:11 +0000 | [diff] [blame] | 798 | llvm::raw_fd_ostream Out(TmpFD, true); |
Douglas Gregor | a6b00fc | 2013-01-23 22:38:11 +0000 | [diff] [blame] | 799 | if (Out.has_error()) |
| 800 | return EC_IOError; |
| 801 | |
| 802 | // Write the index. |
| 803 | Out.write(OutputBuffer.data(), OutputBuffer.size()); |
| 804 | Out.close(); |
| 805 | if (Out.has_error()) |
| 806 | return EC_IOError; |
| 807 | |
| 808 | // Remove the old index file. It isn't relevant any more. |
| 809 | bool OldIndexExisted; |
| 810 | llvm::sys::fs::remove(IndexPath.str(), OldIndexExisted); |
| 811 | |
| 812 | // Rename the newly-written index file to the proper name. |
| 813 | if (llvm::sys::fs::rename(IndexTmpPath.str(), IndexPath.str())) { |
| 814 | // Rename failed; just remove the |
| 815 | llvm::sys::fs::remove(IndexTmpPath.str(), OldIndexExisted); |
| 816 | return EC_IOError; |
| 817 | } |
| 818 | |
| 819 | // We're done. |
| 820 | return EC_None; |
| 821 | } |
Argyrios Kyrtzidis | 87f9d81 | 2013-04-17 22:10:55 +0000 | [diff] [blame] | 822 | |
| 823 | namespace { |
| 824 | class GlobalIndexIdentifierIterator : public IdentifierIterator { |
| 825 | /// \brief The current position within the identifier lookup table. |
| 826 | IdentifierIndexTable::key_iterator Current; |
| 827 | |
| 828 | /// \brief The end position within the identifier lookup table. |
| 829 | IdentifierIndexTable::key_iterator End; |
| 830 | |
| 831 | public: |
| 832 | explicit GlobalIndexIdentifierIterator(IdentifierIndexTable &Idx) { |
| 833 | Current = Idx.key_begin(); |
| 834 | End = Idx.key_end(); |
| 835 | } |
| 836 | |
| 837 | virtual StringRef Next() { |
| 838 | if (Current == End) |
| 839 | return StringRef(); |
| 840 | |
| 841 | StringRef Result = *Current; |
| 842 | ++Current; |
| 843 | return Result; |
| 844 | } |
| 845 | }; |
| 846 | } |
| 847 | |
| 848 | IdentifierIterator *GlobalModuleIndex::createIdentifierIterator() const { |
| 849 | IdentifierIndexTable &Table = |
| 850 | *static_cast<IdentifierIndexTable *>(IdentifierIndex); |
| 851 | return new GlobalIndexIdentifierIterator(Table); |
| 852 | } |