ASTUnit.h revision 89d9980bbc2e4a4ac86673e6ec16fb9f5babb63b
1//===--- ASTUnit.h - ASTUnit utility ----------------------------*- 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// ASTUnit utility class. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CLANG_FRONTEND_ASTUNIT_H 15#define LLVM_CLANG_FRONTEND_ASTUNIT_H 16 17#include "clang/Index/ASTLocation.h" 18#include "clang/Serialization/ASTBitCodes.h" 19#include "clang/Sema/Sema.h" 20#include "clang/Sema/CodeCompleteConsumer.h" 21#include "clang/Lex/PreprocessingRecord.h" 22#include "clang/Basic/SourceManager.h" 23#include "clang/Basic/FileManager.h" 24#include "clang/Basic/FileSystemOptions.h" 25#include "clang-c/Index.h" 26#include "llvm/ADT/IntrusiveRefCntPtr.h" 27#include "llvm/ADT/OwningPtr.h" 28#include "llvm/ADT/SmallVector.h" 29#include "llvm/ADT/StringMap.h" 30#include "llvm/Support/Path.h" 31#include <map> 32#include <string> 33#include <vector> 34#include <cassert> 35#include <utility> 36#include <sys/types.h> 37 38namespace llvm { 39 class MemoryBuffer; 40} 41 42namespace clang { 43class ASTContext; 44class CodeCompleteConsumer; 45class CompilerInvocation; 46class Decl; 47class Diagnostic; 48class FileEntry; 49class FileManager; 50class HeaderSearch; 51class Preprocessor; 52class SourceManager; 53class TargetInfo; 54 55using namespace idx; 56 57/// \brief Utility class for loading a ASTContext from an AST file. 58/// 59class ASTUnit { 60public: 61 typedef std::map<FileID, std::vector<PreprocessedEntity *> > 62 PreprocessedEntitiesByFileMap; 63 64private: 65 llvm::IntrusiveRefCntPtr<Diagnostic> Diagnostics; 66 llvm::OwningPtr<FileManager> FileMgr; 67 llvm::OwningPtr<SourceManager> SourceMgr; 68 llvm::OwningPtr<HeaderSearch> HeaderInfo; 69 llvm::OwningPtr<TargetInfo> Target; 70 llvm::OwningPtr<Preprocessor> PP; 71 llvm::OwningPtr<ASTContext> Ctx; 72 73 FileSystemOptions FileSystemOpts; 74 75 /// \brief The AST consumer that received information about the translation 76 /// unit as it was parsed or loaded. 77 llvm::OwningPtr<ASTConsumer> Consumer; 78 79 /// \brief The semantic analysis object used to type-check the translation 80 /// unit. 81 llvm::OwningPtr<Sema> TheSema; 82 83 /// Optional owned invocation, just used to make the invocation used in 84 /// LoadFromCommandLine available. 85 llvm::OwningPtr<CompilerInvocation> Invocation; 86 87 // OnlyLocalDecls - when true, walking this AST should only visit declarations 88 // that come from the AST itself, not from included precompiled headers. 89 // FIXME: This is temporary; eventually, CIndex will always do this. 90 bool OnlyLocalDecls; 91 92 /// \brief Whether to capture any diagnostics produced. 93 bool CaptureDiagnostics; 94 95 /// \brief Track whether the main file was loaded from an AST or not. 96 bool MainFileIsAST; 97 98 /// \brief Whether this AST represents a complete translation unit. 99 bool CompleteTranslationUnit; 100 101 /// \brief Whether we should time each operation. 102 bool WantTiming; 103 104 /// Track the top-level decls which appeared in an ASTUnit which was loaded 105 /// from a source file. 106 // 107 // FIXME: This is just an optimization hack to avoid deserializing large parts 108 // of a PCH file when using the Index library on an ASTUnit loaded from 109 // source. In the long term we should make the Index library use efficient and 110 // more scalable search mechanisms. 111 std::vector<Decl*> TopLevelDecls; 112 113 /// \brief The list of preprocessed entities which appeared when the ASTUnit 114 /// was loaded. 115 /// 116 /// FIXME: This is just an optimization hack to avoid deserializing large 117 /// parts of a PCH file while performing a walk or search. In the long term, 118 /// we should provide more scalable search mechanisms. 119 std::vector<PreprocessedEntity *> PreprocessedEntities; 120 121 /// The name of the original source file used to generate this ASTUnit. 122 std::string OriginalSourceFile; 123 124 // Critical optimization when using clang_getCursor(). 125 ASTLocation LastLoc; 126 127 /// \brief The set of diagnostics produced when creating this 128 /// translation unit. 129 llvm::SmallVector<StoredDiagnostic, 4> StoredDiagnostics; 130 131 /// \brief The number of stored diagnostics that come from the driver 132 /// itself. 133 /// 134 /// Diagnostics that come from the driver are retained from one parse to 135 /// the next. 136 unsigned NumStoredDiagnosticsFromDriver; 137 138 /// \brief Temporary files that should be removed when the ASTUnit is 139 /// destroyed. 140 llvm::SmallVector<llvm::sys::Path, 4> TemporaryFiles; 141 142 /// \brief A mapping from file IDs to the set of preprocessed entities 143 /// stored in that file. 144 /// 145 /// FIXME: This is just an optimization hack to avoid searching through 146 /// many preprocessed entities during cursor traversal in the CIndex library. 147 /// Ideally, we would just be able to perform a binary search within the 148 /// list of preprocessed entities. 149 PreprocessedEntitiesByFileMap PreprocessedEntitiesByFile; 150 151 /// \brief Simple hack to allow us to assert that ASTUnit is not being 152 /// used concurrently, which is not supported. 153 /// 154 /// Clients should create instances of the ConcurrencyCheck class whenever 155 /// using the ASTUnit in a way that isn't intended to be concurrent, which is 156 /// just about any usage. 157 unsigned int ConcurrencyCheckValue; 158 static const unsigned int CheckLocked = 28573289; 159 static const unsigned int CheckUnlocked = 9803453; 160 161 /// \brief Counter that determines when we want to try building a 162 /// precompiled preamble. 163 /// 164 /// If zero, we will never build a precompiled preamble. Otherwise, 165 /// it's treated as a counter that decrements each time we reparse 166 /// without the benefit of a precompiled preamble. When it hits 1, 167 /// we'll attempt to rebuild the precompiled header. This way, if 168 /// building the precompiled preamble fails, we won't try again for 169 /// some number of calls. 170 unsigned PreambleRebuildCounter; 171 172 /// \brief The file in which the precompiled preamble is stored. 173 std::string PreambleFile; 174 175 /// \brief The contents of the preamble that has been precompiled to 176 /// \c PreambleFile. 177 std::vector<char> Preamble; 178 179 /// \brief Whether the preamble ends at the start of a new line. 180 /// 181 /// Used to inform the lexer as to whether it's starting at the beginning of 182 /// a line after skipping the preamble. 183 bool PreambleEndsAtStartOfLine; 184 185 /// \brief The size of the source buffer that we've reserved for the main 186 /// file within the precompiled preamble. 187 unsigned PreambleReservedSize; 188 189 /// \brief Keeps track of the files that were used when computing the 190 /// preamble, with both their buffer size and their modification time. 191 /// 192 /// If any of the files have changed from one compile to the next, 193 /// the preamble must be thrown away. 194 llvm::StringMap<std::pair<off_t, time_t> > FilesInPreamble; 195 196 /// \brief When non-NULL, this is the buffer used to store the contents of 197 /// the main file when it has been padded for use with the precompiled 198 /// preamble. 199 llvm::MemoryBuffer *SavedMainFileBuffer; 200 201 /// \brief When non-NULL, this is the buffer used to store the 202 /// contents of the preamble when it has been padded to build the 203 /// precompiled preamble. 204 llvm::MemoryBuffer *PreambleBuffer; 205 206 /// \brief The number of warnings that occurred while parsing the preamble. 207 /// 208 /// This value will be used to restore the state of the \c Diagnostic object 209 /// when re-using the precompiled preamble. Note that only the 210 /// number of warnings matters, since we will not save the preamble 211 /// when any errors are present. 212 unsigned NumWarningsInPreamble; 213 214 /// \brief The number of diagnostics that were stored when parsing 215 /// the precompiled preamble. 216 /// 217 /// This value is used to determine how many of the stored 218 /// diagnostics should be retained when reparsing in the presence of 219 /// a precompiled preamble. 220 unsigned NumStoredDiagnosticsInPreamble; 221 222 /// \brief A list of the serialization ID numbers for each of the top-level 223 /// declarations parsed within the precompiled preamble. 224 std::vector<serialization::DeclID> TopLevelDeclsInPreamble; 225 226 /// \brief A list of the offsets into the precompiled preamble which 227 /// correspond to preprocessed entities. 228 std::vector<uint64_t> PreprocessedEntitiesInPreamble; 229 230 /// \brief Whether we should be caching code-completion results. 231 bool ShouldCacheCodeCompletionResults; 232 233 static void ConfigureDiags(llvm::IntrusiveRefCntPtr<Diagnostic> &Diags, 234 ASTUnit &AST, bool CaptureDiagnostics); 235 236public: 237 /// \brief A cached code-completion result, which may be introduced in one of 238 /// many different contexts. 239 struct CachedCodeCompletionResult { 240 /// \brief The code-completion string corresponding to this completion 241 /// result. 242 CodeCompletionString *Completion; 243 244 /// \brief A bitmask that indicates which code-completion contexts should 245 /// contain this completion result. 246 /// 247 /// The bits in the bitmask correspond to the values of 248 /// CodeCompleteContext::Kind. To map from a completion context kind to a 249 /// bit, subtract one from the completion context kind and shift 1 by that 250 /// number of bits. Many completions can occur in several different 251 /// contexts. 252 unsigned ShowInContexts; 253 254 /// \brief The priority given to this code-completion result. 255 unsigned Priority; 256 257 /// \brief The libclang cursor kind corresponding to this code-completion 258 /// result. 259 CXCursorKind Kind; 260 261 /// \brief The availability of this code-completion result. 262 CXAvailabilityKind Availability; 263 264 /// \brief The simplified type class for a non-macro completion result. 265 SimplifiedTypeClass TypeClass; 266 267 /// \brief The type of a non-macro completion result, stored as a unique 268 /// integer used by the string map of cached completion types. 269 /// 270 /// This value will be zero if the type is not known, or a unique value 271 /// determined by the formatted type string. Se \c CachedCompletionTypes 272 /// for more information. 273 unsigned Type; 274 }; 275 276 /// \brief Retrieve the mapping from formatted type names to unique type 277 /// identifiers. 278 llvm::StringMap<unsigned> &getCachedCompletionTypes() { 279 return CachedCompletionTypes; 280 } 281 282private: 283 /// \brief The set of cached code-completion results. 284 std::vector<CachedCodeCompletionResult> CachedCompletionResults; 285 286 /// \brief A mapping from the formatted type name to a unique number for that 287 /// type, which is used for type equality comparisons. 288 llvm::StringMap<unsigned> CachedCompletionTypes; 289 290 /// \brief The number of top-level declarations present the last time we 291 /// cached code-completion results. 292 /// 293 /// The value is used to help detect when we should repopulate the global 294 /// completion cache. 295 unsigned NumTopLevelDeclsAtLastCompletionCache; 296 297 /// \brief The number of reparses left until we'll consider updating the 298 /// code-completion cache. 299 /// 300 /// This is meant to avoid thrashing during reparsing, by not allowing the 301 /// code-completion cache to be updated on every reparse. 302 unsigned CacheCodeCompletionCoolDown; 303 304 /// \brief Bit used by CIndex to mark when a translation unit may be in an 305 /// inconsistent state, and is not safe to free. 306 unsigned UnsafeToFree : 1; 307 308 /// \brief Cache any "global" code-completion results, so that we can avoid 309 /// recomputing them with each completion. 310 void CacheCodeCompletionResults(); 311 312 /// \brief Clear out and deallocate 313 void ClearCachedCompletionResults(); 314 315 ASTUnit(const ASTUnit&); // DO NOT IMPLEMENT 316 ASTUnit &operator=(const ASTUnit &); // DO NOT IMPLEMENT 317 318 explicit ASTUnit(bool MainFileIsAST); 319 320 void CleanTemporaryFiles(); 321 bool Parse(llvm::MemoryBuffer *OverrideMainBuffer); 322 323 std::pair<llvm::MemoryBuffer *, std::pair<unsigned, bool> > 324 ComputePreamble(CompilerInvocation &Invocation, 325 unsigned MaxLines, bool &CreatedBuffer); 326 327 llvm::MemoryBuffer *getMainBufferWithPrecompiledPreamble( 328 CompilerInvocation PreambleInvocation, 329 bool AllowRebuild = true, 330 unsigned MaxLines = 0); 331 void RealizeTopLevelDeclsFromPreamble(); 332 void RealizePreprocessedEntitiesFromPreamble(); 333 334public: 335 class ConcurrencyCheck { 336 volatile ASTUnit &Self; 337 338 public: 339 explicit ConcurrencyCheck(ASTUnit &Self) 340 : Self(Self) 341 { 342 assert(Self.ConcurrencyCheckValue == CheckUnlocked && 343 "Concurrent access to ASTUnit!"); 344 Self.ConcurrencyCheckValue = CheckLocked; 345 } 346 347 ~ConcurrencyCheck() { 348 Self.ConcurrencyCheckValue = CheckUnlocked; 349 } 350 }; 351 friend class ConcurrencyCheck; 352 353 ~ASTUnit(); 354 355 bool isMainFileAST() const { return MainFileIsAST; } 356 357 bool isUnsafeToFree() const { return UnsafeToFree; } 358 void setUnsafeToFree(bool Value) { UnsafeToFree = Value; } 359 360 const Diagnostic &getDiagnostics() const { return *Diagnostics; } 361 Diagnostic &getDiagnostics() { return *Diagnostics; } 362 363 const SourceManager &getSourceManager() const { return *SourceMgr; } 364 SourceManager &getSourceManager() { return *SourceMgr; } 365 366 const Preprocessor &getPreprocessor() const { return *PP.get(); } 367 Preprocessor &getPreprocessor() { return *PP.get(); } 368 369 const ASTContext &getASTContext() const { return *Ctx.get(); } 370 ASTContext &getASTContext() { return *Ctx.get(); } 371 372 bool hasSema() const { return TheSema; } 373 Sema &getSema() const { 374 assert(TheSema && "ASTUnit does not have a Sema object!"); 375 return *TheSema; 376 } 377 378 const FileManager &getFileManager() const { return *FileMgr; } 379 FileManager &getFileManager() { return *FileMgr; } 380 381 const FileSystemOptions &getFileSystemOpts() const { return FileSystemOpts; } 382 383 const std::string &getOriginalSourceFileName(); 384 const std::string &getASTFileName(); 385 386 /// \brief Add a temporary file that the ASTUnit depends on. 387 /// 388 /// This file will be erased when the ASTUnit is destroyed. 389 void addTemporaryFile(const llvm::sys::Path &TempFile) { 390 TemporaryFiles.push_back(TempFile); 391 } 392 393 bool getOnlyLocalDecls() const { return OnlyLocalDecls; } 394 395 /// \brief Retrieve the maximum PCH level of declarations that a 396 /// traversal of the translation unit should consider. 397 unsigned getMaxPCHLevel() const; 398 399 void setLastASTLocation(ASTLocation ALoc) { LastLoc = ALoc; } 400 ASTLocation getLastASTLocation() const { return LastLoc; } 401 402 403 llvm::StringRef getMainFileName() const; 404 405 typedef std::vector<Decl *>::iterator top_level_iterator; 406 407 top_level_iterator top_level_begin() { 408 assert(!isMainFileAST() && "Invalid call for AST based ASTUnit!"); 409 if (!TopLevelDeclsInPreamble.empty()) 410 RealizeTopLevelDeclsFromPreamble(); 411 return TopLevelDecls.begin(); 412 } 413 414 top_level_iterator top_level_end() { 415 assert(!isMainFileAST() && "Invalid call for AST based ASTUnit!"); 416 if (!TopLevelDeclsInPreamble.empty()) 417 RealizeTopLevelDeclsFromPreamble(); 418 return TopLevelDecls.end(); 419 } 420 421 std::size_t top_level_size() const { 422 assert(!isMainFileAST() && "Invalid call for AST based ASTUnit!"); 423 return TopLevelDeclsInPreamble.size() + TopLevelDecls.size(); 424 } 425 426 bool top_level_empty() const { 427 assert(!isMainFileAST() && "Invalid call for AST based ASTUnit!"); 428 return TopLevelDeclsInPreamble.empty() && TopLevelDecls.empty(); 429 } 430 431 /// \brief Add a new top-level declaration. 432 void addTopLevelDecl(Decl *D) { 433 TopLevelDecls.push_back(D); 434 } 435 436 /// \brief Add a new top-level declaration, identified by its ID in 437 /// the precompiled preamble. 438 void addTopLevelDeclFromPreamble(serialization::DeclID D) { 439 TopLevelDeclsInPreamble.push_back(D); 440 } 441 442 typedef std::vector<PreprocessedEntity *>::iterator pp_entity_iterator; 443 444 pp_entity_iterator pp_entity_begin(); 445 pp_entity_iterator pp_entity_end(); 446 447 /// \brief Add a new preprocessed entity that's stored at the given offset 448 /// in the precompiled preamble. 449 void addPreprocessedEntityFromPreamble(uint64_t Offset) { 450 PreprocessedEntitiesInPreamble.push_back(Offset); 451 } 452 453 /// \brief Retrieve the mapping from File IDs to the preprocessed entities 454 /// within that file. 455 PreprocessedEntitiesByFileMap &getPreprocessedEntitiesByFile() { 456 return PreprocessedEntitiesByFile; 457 } 458 459 // Retrieve the diagnostics associated with this AST 460 typedef const StoredDiagnostic *stored_diag_iterator; 461 stored_diag_iterator stored_diag_begin() const { 462 return StoredDiagnostics.begin(); 463 } 464 stored_diag_iterator stored_diag_end() const { 465 return StoredDiagnostics.end(); 466 } 467 unsigned stored_diag_size() const { return StoredDiagnostics.size(); } 468 469 llvm::SmallVector<StoredDiagnostic, 4> &getStoredDiagnostics() { 470 return StoredDiagnostics; 471 } 472 473 typedef std::vector<CachedCodeCompletionResult>::iterator 474 cached_completion_iterator; 475 476 cached_completion_iterator cached_completion_begin() { 477 return CachedCompletionResults.begin(); 478 } 479 480 cached_completion_iterator cached_completion_end() { 481 return CachedCompletionResults.end(); 482 } 483 484 unsigned cached_completion_size() const { 485 return CachedCompletionResults.size(); 486 } 487 488 llvm::MemoryBuffer *getBufferForFile(llvm::StringRef Filename, 489 std::string *ErrorStr = 0); 490 491 /// \brief Whether this AST represents a complete translation unit. 492 /// 493 /// If false, this AST is only a partial translation unit, e.g., one 494 /// that might still be used as a precompiled header or preamble. 495 bool isCompleteTranslationUnit() const { return CompleteTranslationUnit; } 496 497 /// \brief A mapping from a file name to the memory buffer that stores the 498 /// remapped contents of that file. 499 typedef std::pair<std::string, const llvm::MemoryBuffer *> RemappedFile; 500 501 /// \brief Create a ASTUnit from an AST file. 502 /// 503 /// \param Filename - The AST file to load. 504 /// 505 /// \param Diags - The diagnostics engine to use for reporting errors; its 506 /// lifetime is expected to extend past that of the returned ASTUnit. 507 /// 508 /// \returns - The initialized ASTUnit or null if the AST failed to load. 509 static ASTUnit *LoadFromASTFile(const std::string &Filename, 510 llvm::IntrusiveRefCntPtr<Diagnostic> Diags, 511 const FileSystemOptions &FileSystemOpts, 512 bool OnlyLocalDecls = false, 513 RemappedFile *RemappedFiles = 0, 514 unsigned NumRemappedFiles = 0, 515 bool CaptureDiagnostics = false); 516 517private: 518 /// \brief Helper function for \c LoadFromCompilerInvocation() and 519 /// \c LoadFromCommandLine(), which loads an AST from a compiler invocation. 520 /// 521 /// \param PrecompilePreamble Whether to precompile the preamble of this 522 /// translation unit, to improve the performance of reparsing. 523 /// 524 /// \returns \c true if a catastrophic failure occurred (which means that the 525 /// \c ASTUnit itself is invalid), or \c false otherwise. 526 bool LoadFromCompilerInvocation(bool PrecompilePreamble); 527 528public: 529 530 /// LoadFromCompilerInvocation - Create an ASTUnit from a source file, via a 531 /// CompilerInvocation object. 532 /// 533 /// \param CI - The compiler invocation to use; it must have exactly one input 534 /// source file. The ASTUnit takes ownership of the CompilerInvocation object. 535 /// 536 /// \param Diags - The diagnostics engine to use for reporting errors; its 537 /// lifetime is expected to extend past that of the returned ASTUnit. 538 // 539 // FIXME: Move OnlyLocalDecls, UseBumpAllocator to setters on the ASTUnit, we 540 // shouldn't need to specify them at construction time. 541 static ASTUnit *LoadFromCompilerInvocation(CompilerInvocation *CI, 542 llvm::IntrusiveRefCntPtr<Diagnostic> Diags, 543 bool OnlyLocalDecls = false, 544 bool CaptureDiagnostics = false, 545 bool PrecompilePreamble = false, 546 bool CompleteTranslationUnit = true, 547 bool CacheCodeCompletionResults = false); 548 549 /// LoadFromCommandLine - Create an ASTUnit from a vector of command line 550 /// arguments, which must specify exactly one source file. 551 /// 552 /// \param ArgBegin - The beginning of the argument vector. 553 /// 554 /// \param ArgEnd - The end of the argument vector. 555 /// 556 /// \param Diags - The diagnostics engine to use for reporting errors; its 557 /// lifetime is expected to extend past that of the returned ASTUnit. 558 /// 559 /// \param ResourceFilesPath - The path to the compiler resource files. 560 // 561 // FIXME: Move OnlyLocalDecls, UseBumpAllocator to setters on the ASTUnit, we 562 // shouldn't need to specify them at construction time. 563 static ASTUnit *LoadFromCommandLine(const char **ArgBegin, 564 const char **ArgEnd, 565 llvm::IntrusiveRefCntPtr<Diagnostic> Diags, 566 llvm::StringRef ResourceFilesPath, 567 bool OnlyLocalDecls = false, 568 bool CaptureDiagnostics = false, 569 RemappedFile *RemappedFiles = 0, 570 unsigned NumRemappedFiles = 0, 571 bool PrecompilePreamble = false, 572 bool CompleteTranslationUnit = true, 573 bool CacheCodeCompletionResults = false, 574 bool CXXPrecompilePreamble = false, 575 bool CXXChainedPCH = false); 576 577 /// \brief Reparse the source files using the same command-line options that 578 /// were originally used to produce this translation unit. 579 /// 580 /// \returns True if a failure occurred that causes the ASTUnit not to 581 /// contain any translation-unit information, false otherwise. 582 bool Reparse(RemappedFile *RemappedFiles = 0, 583 unsigned NumRemappedFiles = 0); 584 585 /// \brief Perform code completion at the given file, line, and 586 /// column within this translation unit. 587 /// 588 /// \param File The file in which code completion will occur. 589 /// 590 /// \param Line The line at which code completion will occur. 591 /// 592 /// \param Column The column at which code completion will occur. 593 /// 594 /// \param IncludeMacros Whether to include macros in the code-completion 595 /// results. 596 /// 597 /// \param IncludeCodePatterns Whether to include code patterns (such as a 598 /// for loop) in the code-completion results. 599 /// 600 /// FIXME: The Diag, LangOpts, SourceMgr, FileMgr, StoredDiagnostics, and 601 /// OwnedBuffers parameters are all disgusting hacks. They will go away. 602 void CodeComplete(llvm::StringRef File, unsigned Line, unsigned Column, 603 RemappedFile *RemappedFiles, unsigned NumRemappedFiles, 604 bool IncludeMacros, bool IncludeCodePatterns, 605 CodeCompleteConsumer &Consumer, 606 Diagnostic &Diag, LangOptions &LangOpts, 607 SourceManager &SourceMgr, FileManager &FileMgr, 608 llvm::SmallVectorImpl<StoredDiagnostic> &StoredDiagnostics, 609 llvm::SmallVectorImpl<const llvm::MemoryBuffer *> &OwnedBuffers); 610 611 /// \brief Save this translation unit to a file with the given name. 612 /// 613 /// \returns True if an error occurred, false otherwise. 614 bool Save(llvm::StringRef File); 615}; 616 617} // namespace clang 618 619#endif 620