Clang Project

clang_source_code/lib/Frontend/ASTUnit.cpp
1//===- ASTUnit.cpp - ASTUnit utility --------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// ASTUnit Implementation.
10//
11//===----------------------------------------------------------------------===//
12
13#include "clang/Frontend/ASTUnit.h"
14#include "clang/AST/ASTConsumer.h"
15#include "clang/AST/ASTContext.h"
16#include "clang/AST/CommentCommandTraits.h"
17#include "clang/AST/Decl.h"
18#include "clang/AST/DeclBase.h"
19#include "clang/AST/DeclCXX.h"
20#include "clang/AST/DeclGroup.h"
21#include "clang/AST/DeclObjC.h"
22#include "clang/AST/DeclTemplate.h"
23#include "clang/AST/DeclarationName.h"
24#include "clang/AST/ExternalASTSource.h"
25#include "clang/AST/PrettyPrinter.h"
26#include "clang/AST/Type.h"
27#include "clang/AST/TypeOrdering.h"
28#include "clang/Basic/Diagnostic.h"
29#include "clang/Basic/FileManager.h"
30#include "clang/Basic/IdentifierTable.h"
31#include "clang/Basic/LLVM.h"
32#include "clang/Basic/LangOptions.h"
33#include "clang/Basic/Module.h"
34#include "clang/Basic/SourceLocation.h"
35#include "clang/Basic/SourceManager.h"
36#include "clang/Basic/TargetInfo.h"
37#include "clang/Basic/TargetOptions.h"
38#include "clang/Frontend/CompilerInstance.h"
39#include "clang/Frontend/CompilerInvocation.h"
40#include "clang/Frontend/FrontendAction.h"
41#include "clang/Frontend/FrontendActions.h"
42#include "clang/Frontend/FrontendDiagnostic.h"
43#include "clang/Frontend/FrontendOptions.h"
44#include "clang/Frontend/MultiplexConsumer.h"
45#include "clang/Frontend/PrecompiledPreamble.h"
46#include "clang/Frontend/Utils.h"
47#include "clang/Lex/HeaderSearch.h"
48#include "clang/Lex/HeaderSearchOptions.h"
49#include "clang/Lex/Lexer.h"
50#include "clang/Lex/PPCallbacks.h"
51#include "clang/Lex/PreprocessingRecord.h"
52#include "clang/Lex/Preprocessor.h"
53#include "clang/Lex/PreprocessorOptions.h"
54#include "clang/Lex/Token.h"
55#include "clang/Sema/CodeCompleteConsumer.h"
56#include "clang/Sema/CodeCompleteOptions.h"
57#include "clang/Sema/Sema.h"
58#include "clang/Serialization/ASTBitCodes.h"
59#include "clang/Serialization/ASTReader.h"
60#include "clang/Serialization/ASTWriter.h"
61#include "clang/Serialization/ContinuousRangeMap.h"
62#include "clang/Serialization/InMemoryModuleCache.h"
63#include "clang/Serialization/Module.h"
64#include "clang/Serialization/PCHContainerOperations.h"
65#include "llvm/ADT/ArrayRef.h"
66#include "llvm/ADT/DenseMap.h"
67#include "llvm/ADT/IntrusiveRefCntPtr.h"
68#include "llvm/ADT/None.h"
69#include "llvm/ADT/Optional.h"
70#include "llvm/ADT/STLExtras.h"
71#include "llvm/ADT/SmallString.h"
72#include "llvm/ADT/SmallVector.h"
73#include "llvm/ADT/StringMap.h"
74#include "llvm/ADT/StringRef.h"
75#include "llvm/ADT/StringSet.h"
76#include "llvm/ADT/Twine.h"
77#include "llvm/ADT/iterator_range.h"
78#include "llvm/Bitcode/BitstreamWriter.h"
79#include "llvm/Support/Allocator.h"
80#include "llvm/Support/Casting.h"
81#include "llvm/Support/CrashRecoveryContext.h"
82#include "llvm/Support/DJB.h"
83#include "llvm/Support/ErrorHandling.h"
84#include "llvm/Support/ErrorOr.h"
85#include "llvm/Support/FileSystem.h"
86#include "llvm/Support/MemoryBuffer.h"
87#include "llvm/Support/Mutex.h"
88#include "llvm/Support/Timer.h"
89#include "llvm/Support/VirtualFileSystem.h"
90#include "llvm/Support/raw_ostream.h"
91#include <algorithm>
92#include <atomic>
93#include <cassert>
94#include <cstdint>
95#include <cstdio>
96#include <cstdlib>
97#include <memory>
98#include <string>
99#include <tuple>
100#include <utility>
101#include <vector>
102
103using namespace clang;
104
105using llvm::TimeRecord;
106
107namespace {
108
109  class SimpleTimer {
110    bool WantTiming;
111    TimeRecord Start;
112    std::string Output;
113
114  public:
115    explicit SimpleTimer(bool WantTiming) : WantTiming(WantTiming) {
116      if (WantTiming)
117        Start = TimeRecord::getCurrentTime();
118    }
119
120    ~SimpleTimer() {
121      if (WantTiming) {
122        TimeRecord Elapsed = TimeRecord::getCurrentTime();
123        Elapsed -= Start;
124        llvm::errs() << Output << ':';
125        Elapsed.print(Elapsed, llvm::errs());
126        llvm::errs() << '\n';
127      }
128    }
129
130    void setOutput(const Twine &Output) {
131      if (WantTiming)
132        this->Output = Output.str();
133    }
134  };
135
136} // namespace
137
138template <class T>
139static std::unique_ptr<T> valueOrNull(llvm::ErrorOr<std::unique_ptr<T>> Val) {
140  if (!Val)
141    return nullptr;
142  return std::move(*Val);
143}
144
145template <class T>
146static bool moveOnNoError(llvm::ErrorOr<T> Val, T &Output) {
147  if (!Val)
148    return false;
149  Output = std::move(*Val);
150  return true;
151}
152
153/// Get a source buffer for \p MainFilePath, handling all file-to-file
154/// and file-to-buffer remappings inside \p Invocation.
155static std::unique_ptr<llvm::MemoryBuffer>
156getBufferForFileHandlingRemapping(const CompilerInvocation &Invocation,
157                                  llvm::vfs::FileSystem *VFS,
158                                  StringRef FilePath, bool isVolatile) {
159  const auto &PreprocessorOpts = Invocation.getPreprocessorOpts();
160
161  // Try to determine if the main file has been remapped, either from the
162  // command line (to another file) or directly through the compiler
163  // invocation (to a memory buffer).
164  llvm::MemoryBuffer *Buffer = nullptr;
165  std::unique_ptr<llvm::MemoryBuffer> BufferOwner;
166  auto FileStatus = VFS->status(FilePath);
167  if (FileStatus) {
168    llvm::sys::fs::UniqueID MainFileID = FileStatus->getUniqueID();
169
170    // Check whether there is a file-file remapping of the main file
171    for (const auto &RF : PreprocessorOpts.RemappedFiles) {
172      std::string MPath(RF.first);
173      auto MPathStatus = VFS->status(MPath);
174      if (MPathStatus) {
175        llvm::sys::fs::UniqueID MID = MPathStatus->getUniqueID();
176        if (MainFileID == MID) {
177          // We found a remapping. Try to load the resulting, remapped source.
178          BufferOwner = valueOrNull(VFS->getBufferForFile(RF.second, -1, true, isVolatile));
179          if (!BufferOwner)
180            return nullptr;
181        }
182      }
183    }
184
185    // Check whether there is a file-buffer remapping. It supercedes the
186    // file-file remapping.
187    for (const auto &RB : PreprocessorOpts.RemappedFileBuffers) {
188      std::string MPath(RB.first);
189      auto MPathStatus = VFS->status(MPath);
190      if (MPathStatus) {
191        llvm::sys::fs::UniqueID MID = MPathStatus->getUniqueID();
192        if (MainFileID == MID) {
193          // We found a remapping.
194          BufferOwner.reset();
195          Buffer = const_cast<llvm::MemoryBuffer *>(RB.second);
196        }
197      }
198    }
199  }
200
201  // If the main source file was not remapped, load it now.
202  if (!Buffer && !BufferOwner) {
203    BufferOwner = valueOrNull(VFS->getBufferForFile(FilePath, -1, true, isVolatile));
204    if (!BufferOwner)
205      return nullptr;
206  }
207
208  if (BufferOwner)
209    return BufferOwner;
210  if (!Buffer)
211    return nullptr;
212  return llvm::MemoryBuffer::getMemBufferCopy(Buffer->getBuffer(), FilePath);
213}
214
215struct ASTUnit::ASTWriterData {
216  SmallString<128> Buffer;
217  llvm::BitstreamWriter Stream;
218  ASTWriter Writer;
219
220  ASTWriterData(InMemoryModuleCache &ModuleCache)
221      : Stream(Buffer), Writer(Stream, Buffer, ModuleCache, {}) {}
222};
223
224void ASTUnit::clearFileLevelDecls() {
225  llvm::DeleteContainerSeconds(FileDecls);
226}
227
228/// After failing to build a precompiled preamble (due to
229/// errors in the source that occurs in the preamble), the number of
230/// reparses during which we'll skip even trying to precompile the
231/// preamble.
232const unsigned DefaultPreambleRebuildInterval = 5;
233
234/// Tracks the number of ASTUnit objects that are currently active.
235///
236/// Used for debugging purposes only.
237static std::atomic<unsigned> ActiveASTUnitObjects;
238
239ASTUnit::ASTUnit(bool _MainFileIsAST)
240    : MainFileIsAST(_MainFileIsAST), WantTiming(getenv("LIBCLANG_TIMING")),
241      ShouldCacheCodeCompletionResults(false),
242      IncludeBriefCommentsInCodeCompletion(false), UserFilesAreVolatile(false),
243      UnsafeToFree(false) {
244  if (getenv("LIBCLANG_OBJTRACKING"))
245    fprintf(stderr, "+++ %u translation units\n", ++ActiveASTUnitObjects);
246}
247
248ASTUnit::~ASTUnit() {
249  // If we loaded from an AST file, balance out the BeginSourceFile call.
250  if (MainFileIsAST && getDiagnostics().getClient()) {
251    getDiagnostics().getClient()->EndSourceFile();
252  }
253
254  clearFileLevelDecls();
255
256  // Free the buffers associated with remapped files. We are required to
257  // perform this operation here because we explicitly request that the
258  // compiler instance *not* free these buffers for each invocation of the
259  // parser.
260  if (Invocation && OwnsRemappedFileBuffers) {
261    PreprocessorOptions &PPOpts = Invocation->getPreprocessorOpts();
262    for (const auto &RB : PPOpts.RemappedFileBuffers)
263      delete RB.second;
264  }
265
266  ClearCachedCompletionResults();
267
268  if (getenv("LIBCLANG_OBJTRACKING"))
269    fprintf(stderr, "--- %u translation units\n", --ActiveASTUnitObjects);
270}
271
272void ASTUnit::setPreprocessor(std::shared_ptr<Preprocessor> PP) {
273  this->PP = std::move(PP);
274}
275
276void ASTUnit::enableSourceFileDiagnostics() {
277   (0) . __assert_fail ("getDiagnostics().getClient() && Ctx && \"Bad context for source file\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 278, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(getDiagnostics().getClient() && Ctx &&
278 (0) . __assert_fail ("getDiagnostics().getClient() && Ctx && \"Bad context for source file\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 278, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">      "Bad context for source file");
279  getDiagnostics().getClient()->BeginSourceFile(Ctx->getLangOpts(), PP.get());
280}
281
282/// Determine the set of code-completion contexts in which this
283/// declaration should be shown.
284static uint64_t getDeclShowContexts(const NamedDecl *ND,
285                                    const LangOptions &LangOpts,
286                                    bool &IsNestedNameSpecifier) {
287  IsNestedNameSpecifier = false;
288
289  if (isa<UsingShadowDecl>(ND))
290    ND = ND->getUnderlyingDecl();
291  if (!ND)
292    return 0;
293
294  uint64_t Contexts = 0;
295  if (isa<TypeDecl>(ND) || isa<ObjCInterfaceDecl>(ND) ||
296      isa<ClassTemplateDecl>(ND) || isa<TemplateTemplateParmDecl>(ND) ||
297      isa<TypeAliasTemplateDecl>(ND)) {
298    // Types can appear in these contexts.
299    if (LangOpts.CPlusPlus || !isa<TagDecl>(ND))
300      Contexts |= (1LL << CodeCompletionContext::CCC_TopLevel)
301               |  (1LL << CodeCompletionContext::CCC_ObjCIvarList)
302               |  (1LL << CodeCompletionContext::CCC_ClassStructUnion)
303               |  (1LL << CodeCompletionContext::CCC_Statement)
304               |  (1LL << CodeCompletionContext::CCC_Type)
305               |  (1LL << CodeCompletionContext::CCC_ParenthesizedExpression);
306
307    // In C++, types can appear in expressions contexts (for functional casts).
308    if (LangOpts.CPlusPlus)
309      Contexts |= (1LL << CodeCompletionContext::CCC_Expression);
310
311    // In Objective-C, message sends can send interfaces. In Objective-C++,
312    // all types are available due to functional casts.
313    if (LangOpts.CPlusPlus || isa<ObjCInterfaceDecl>(ND))
314      Contexts |= (1LL << CodeCompletionContext::CCC_ObjCMessageReceiver);
315
316    // In Objective-C, you can only be a subclass of another Objective-C class
317    if (const auto *ID = dyn_cast<ObjCInterfaceDecl>(ND)) {
318      // Objective-C interfaces can be used in a class property expression.
319      if (ID->getDefinition())
320        Contexts |= (1LL << CodeCompletionContext::CCC_Expression);
321      Contexts |= (1LL << CodeCompletionContext::CCC_ObjCInterfaceName);
322    }
323
324    // Deal with tag names.
325    if (isa<EnumDecl>(ND)) {
326      Contexts |= (1LL << CodeCompletionContext::CCC_EnumTag);
327
328      // Part of the nested-name-specifier in C++0x.
329      if (LangOpts.CPlusPlus11)
330        IsNestedNameSpecifier = true;
331    } else if (const auto *Record = dyn_cast<RecordDecl>(ND)) {
332      if (Record->isUnion())
333        Contexts |= (1LL << CodeCompletionContext::CCC_UnionTag);
334      else
335        Contexts |= (1LL << CodeCompletionContext::CCC_ClassOrStructTag);
336
337      if (LangOpts.CPlusPlus)
338        IsNestedNameSpecifier = true;
339    } else if (isa<ClassTemplateDecl>(ND))
340      IsNestedNameSpecifier = true;
341  } else if (isa<ValueDecl>(ND) || isa<FunctionTemplateDecl>(ND)) {
342    // Values can appear in these contexts.
343    Contexts = (1LL << CodeCompletionContext::CCC_Statement)
344             | (1LL << CodeCompletionContext::CCC_Expression)
345             | (1LL << CodeCompletionContext::CCC_ParenthesizedExpression)
346             | (1LL << CodeCompletionContext::CCC_ObjCMessageReceiver);
347  } else if (isa<ObjCProtocolDecl>(ND)) {
348    Contexts = (1LL << CodeCompletionContext::CCC_ObjCProtocolName);
349  } else if (isa<ObjCCategoryDecl>(ND)) {
350    Contexts = (1LL << CodeCompletionContext::CCC_ObjCCategoryName);
351  } else if (isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND)) {
352    Contexts = (1LL << CodeCompletionContext::CCC_Namespace);
353
354    // Part of the nested-name-specifier.
355    IsNestedNameSpecifier = true;
356  }
357
358  return Contexts;
359}
360
361void ASTUnit::CacheCodeCompletionResults() {
362  if (!TheSema)
363    return;
364
365  SimpleTimer Timer(WantTiming);
366  Timer.setOutput("Cache global code completions for " + getMainFileName());
367
368  // Clear out the previous results.
369  ClearCachedCompletionResults();
370
371  // Gather the set of global code completions.
372  using Result = CodeCompletionResult;
373  SmallVector<Result, 8> Results;
374  CachedCompletionAllocator = std::make_shared<GlobalCodeCompletionAllocator>();
375  CodeCompletionTUInfo CCTUInfo(CachedCompletionAllocator);
376  TheSema->GatherGlobalCodeCompletions(*CachedCompletionAllocator,
377                                       CCTUInfo, Results);
378
379  // Translate global code completions into cached completions.
380  llvm::DenseMap<CanQualType, unsigned> CompletionTypes;
381  CodeCompletionContext CCContext(CodeCompletionContext::CCC_TopLevel);
382
383  for (auto &R : Results) {
384    switch (R.Kind) {
385    case Result::RK_Declaration: {
386      bool IsNestedNameSpecifier = false;
387      CachedCodeCompletionResult CachedResult;
388      CachedResult.Completion = R.CreateCodeCompletionString(
389          *TheSema, CCContext, *CachedCompletionAllocator, CCTUInfo,
390          IncludeBriefCommentsInCodeCompletion);
391      CachedResult.ShowInContexts = getDeclShowContexts(
392          R.Declaration, Ctx->getLangOpts(), IsNestedNameSpecifier);
393      CachedResult.Priority = R.Priority;
394      CachedResult.Kind = R.CursorKind;
395      CachedResult.Availability = R.Availability;
396
397      // Keep track of the type of this completion in an ASTContext-agnostic
398      // way.
399      QualType UsageType = getDeclUsageType(*Ctx, R.Declaration);
400      if (UsageType.isNull()) {
401        CachedResult.TypeClass = STC_Void;
402        CachedResult.Type = 0;
403      } else {
404        CanQualType CanUsageType
405          = Ctx->getCanonicalType(UsageType.getUnqualifiedType());
406        CachedResult.TypeClass = getSimplifiedTypeClass(CanUsageType);
407
408        // Determine whether we have already seen this type. If so, we save
409        // ourselves the work of formatting the type string by using the
410        // temporary, CanQualType-based hash table to find the associated value.
411        unsigned &TypeValue = CompletionTypes[CanUsageType];
412        if (TypeValue == 0) {
413          TypeValue = CompletionTypes.size();
414          CachedCompletionTypes[QualType(CanUsageType).getAsString()]
415            = TypeValue;
416        }
417
418        CachedResult.Type = TypeValue;
419      }
420
421      CachedCompletionResults.push_back(CachedResult);
422
423      /// Handle nested-name-specifiers in C++.
424      if (TheSema->Context.getLangOpts().CPlusPlus && IsNestedNameSpecifier &&
425          !R.StartsNestedNameSpecifier) {
426        // The contexts in which a nested-name-specifier can appear in C++.
427        uint64_t NNSContexts
428          = (1LL << CodeCompletionContext::CCC_TopLevel)
429          | (1LL << CodeCompletionContext::CCC_ObjCIvarList)
430          | (1LL << CodeCompletionContext::CCC_ClassStructUnion)
431          | (1LL << CodeCompletionContext::CCC_Statement)
432          | (1LL << CodeCompletionContext::CCC_Expression)
433          | (1LL << CodeCompletionContext::CCC_ObjCMessageReceiver)
434          | (1LL << CodeCompletionContext::CCC_EnumTag)
435          | (1LL << CodeCompletionContext::CCC_UnionTag)
436          | (1LL << CodeCompletionContext::CCC_ClassOrStructTag)
437          | (1LL << CodeCompletionContext::CCC_Type)
438          | (1LL << CodeCompletionContext::CCC_Symbol)
439          | (1LL << CodeCompletionContext::CCC_SymbolOrNewName)
440          | (1LL << CodeCompletionContext::CCC_ParenthesizedExpression);
441
442        if (isa<NamespaceDecl>(R.Declaration) ||
443            isa<NamespaceAliasDecl>(R.Declaration))
444          NNSContexts |= (1LL << CodeCompletionContext::CCC_Namespace);
445
446        if (uint64_t RemainingContexts
447                                = NNSContexts & ~CachedResult.ShowInContexts) {
448          // If there any contexts where this completion can be a
449          // nested-name-specifier but isn't already an option, create a
450          // nested-name-specifier completion.
451          R.StartsNestedNameSpecifier = true;
452          CachedResult.Completion = R.CreateCodeCompletionString(
453              *TheSema, CCContext, *CachedCompletionAllocator, CCTUInfo,
454              IncludeBriefCommentsInCodeCompletion);
455          CachedResult.ShowInContexts = RemainingContexts;
456          CachedResult.Priority = CCP_NestedNameSpecifier;
457          CachedResult.TypeClass = STC_Void;
458          CachedResult.Type = 0;
459          CachedCompletionResults.push_back(CachedResult);
460        }
461      }
462      break;
463    }
464
465    case Result::RK_Keyword:
466    case Result::RK_Pattern:
467      // Ignore keywords and patterns; we don't care, since they are so
468      // easily regenerated.
469      break;
470
471    case Result::RK_Macro: {
472      CachedCodeCompletionResult CachedResult;
473      CachedResult.Completion = R.CreateCodeCompletionString(
474          *TheSema, CCContext, *CachedCompletionAllocator, CCTUInfo,
475          IncludeBriefCommentsInCodeCompletion);
476      CachedResult.ShowInContexts
477        = (1LL << CodeCompletionContext::CCC_TopLevel)
478        | (1LL << CodeCompletionContext::CCC_ObjCInterface)
479        | (1LL << CodeCompletionContext::CCC_ObjCImplementation)
480        | (1LL << CodeCompletionContext::CCC_ObjCIvarList)
481        | (1LL << CodeCompletionContext::CCC_ClassStructUnion)
482        | (1LL << CodeCompletionContext::CCC_Statement)
483        | (1LL << CodeCompletionContext::CCC_Expression)
484        | (1LL << CodeCompletionContext::CCC_ObjCMessageReceiver)
485        | (1LL << CodeCompletionContext::CCC_MacroNameUse)
486        | (1LL << CodeCompletionContext::CCC_PreprocessorExpression)
487        | (1LL << CodeCompletionContext::CCC_ParenthesizedExpression)
488        | (1LL << CodeCompletionContext::CCC_OtherWithMacros);
489
490      CachedResult.Priority = R.Priority;
491      CachedResult.Kind = R.CursorKind;
492      CachedResult.Availability = R.Availability;
493      CachedResult.TypeClass = STC_Void;
494      CachedResult.Type = 0;
495      CachedCompletionResults.push_back(CachedResult);
496      break;
497    }
498    }
499  }
500
501  // Save the current top-level hash value.
502  CompletionCacheTopLevelHashValue = CurrentTopLevelHashValue;
503}
504
505void ASTUnit::ClearCachedCompletionResults() {
506  CachedCompletionResults.clear();
507  CachedCompletionTypes.clear();
508  CachedCompletionAllocator = nullptr;
509}
510
511namespace {
512
513/// Gathers information from ASTReader that will be used to initialize
514/// a Preprocessor.
515class ASTInfoCollector : public ASTReaderListener {
516  Preprocessor &PP;
517  ASTContext *Context;
518  HeaderSearchOptions &HSOpts;
519  PreprocessorOptions &PPOpts;
520  LangOptions &LangOpt;
521  std::shared_ptr<TargetOptions> &TargetOpts;
522  IntrusiveRefCntPtr<TargetInfo> &Target;
523  unsigned &Counter;
524  bool InitializedLanguage = false;
525
526public:
527  ASTInfoCollector(Preprocessor &PP, ASTContext *Context,
528                   HeaderSearchOptions &HSOpts, PreprocessorOptions &PPOpts,
529                   LangOptions &LangOpt,
530                   std::shared_ptr<TargetOptions> &TargetOpts,
531                   IntrusiveRefCntPtr<TargetInfo> &Target, unsigned &Counter)
532      : PP(PP), Context(Context), HSOpts(HSOpts), PPOpts(PPOpts),
533        LangOpt(LangOpt), TargetOpts(TargetOpts), Target(Target),
534        Counter(Counter) {}
535
536  bool ReadLanguageOptions(const LangOptions &LangOpts, bool Complain,
537                           bool AllowCompatibleDifferences) override {
538    if (InitializedLanguage)
539      return false;
540
541    LangOpt = LangOpts;
542    InitializedLanguage = true;
543
544    updated();
545    return false;
546  }
547
548  bool ReadHeaderSearchOptions(const HeaderSearchOptions &HSOpts,
549                               StringRef SpecificModuleCachePath,
550                               bool Complain) override {
551    this->HSOpts = HSOpts;
552    return false;
553  }
554
555  bool ReadPreprocessorOptions(const PreprocessorOptions &PPOpts, bool Complain,
556                               std::string &SuggestedPredefines) override {
557    this->PPOpts = PPOpts;
558    return false;
559  }
560
561  bool ReadTargetOptions(const TargetOptions &TargetOpts, bool Complain,
562                         bool AllowCompatibleDifferences) override {
563    // If we've already initialized the target, don't do it again.
564    if (Target)
565      return false;
566
567    this->TargetOpts = std::make_shared<TargetOptions>(TargetOpts);
568    Target =
569        TargetInfo::CreateTargetInfo(PP.getDiagnostics(), this->TargetOpts);
570
571    updated();
572    return false;
573  }
574
575  void ReadCounter(const serialization::ModuleFile &M,
576                   unsigned Value) override {
577    Counter = Value;
578  }
579
580private:
581  void updated() {
582    if (!Target || !InitializedLanguage)
583      return;
584
585    // Inform the target of the language options.
586    //
587    // FIXME: We shouldn't need to do this, the target should be immutable once
588    // created. This complexity should be lifted elsewhere.
589    Target->adjust(LangOpt);
590
591    // Initialize the preprocessor.
592    PP.Initialize(*Target);
593
594    if (!Context)
595      return;
596
597    // Initialize the ASTContext
598    Context->InitBuiltinTypes(*Target);
599
600    // Adjust printing policy based on language options.
601    Context->setPrintingPolicy(PrintingPolicy(LangOpt));
602
603    // We didn't have access to the comment options when the ASTContext was
604    // constructed, so register them now.
605    Context->getCommentCommandTraits().registerCommentOptions(
606        LangOpt.CommentOpts);
607  }
608};
609
610/// Diagnostic consumer that saves each diagnostic it is given.
611class StoredDiagnosticConsumer : public DiagnosticConsumer {
612  SmallVectorImpl<StoredDiagnostic> *StoredDiags;
613  SmallVectorImpl<ASTUnit::StandaloneDiagnostic> *StandaloneDiags;
614  const LangOptions *LangOpts = nullptr;
615  SourceManager *SourceMgr = nullptr;
616
617public:
618  StoredDiagnosticConsumer(
619      SmallVectorImpl<StoredDiagnostic> *StoredDiags,
620      SmallVectorImpl<ASTUnit::StandaloneDiagnostic> *StandaloneDiags)
621      : StoredDiags(StoredDiags), StandaloneDiags(StandaloneDiags) {
622     (0) . __assert_fail ("(StoredDiags || StandaloneDiags) && \"No output collections were passed to StoredDiagnosticConsumer.\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 623, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert((StoredDiags || StandaloneDiags) &&
623 (0) . __assert_fail ("(StoredDiags || StandaloneDiags) && \"No output collections were passed to StoredDiagnosticConsumer.\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 623, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">           "No output collections were passed to StoredDiagnosticConsumer.");
624  }
625
626  void BeginSourceFile(const LangOptions &LangOpts,
627                       const Preprocessor *PP = nullptr) override {
628    this->LangOpts = &LangOpts;
629    if (PP)
630      SourceMgr = &PP->getSourceManager();
631  }
632
633  void HandleDiagnostic(DiagnosticsEngine::Level Level,
634                        const Diagnostic &Info) override;
635};
636
637/// RAII object that optionally captures diagnostics, if
638/// there is no diagnostic client to capture them already.
639class CaptureDroppedDiagnostics {
640  DiagnosticsEngine &Diags;
641  StoredDiagnosticConsumer Client;
642  DiagnosticConsumer *PreviousClient = nullptr;
643  std::unique_ptr<DiagnosticConsumer> OwningPreviousClient;
644
645public:
646  CaptureDroppedDiagnostics(
647      bool RequestCapture, DiagnosticsEngine &Diags,
648      SmallVectorImpl<StoredDiagnostic> *StoredDiags,
649      SmallVectorImpl<ASTUnit::StandaloneDiagnostic> *StandaloneDiags)
650      : Diags(Diags), Client(StoredDiags, StandaloneDiags) {
651    if (RequestCapture || Diags.getClient() == nullptr) {
652      OwningPreviousClient = Diags.takeClient();
653      PreviousClient = Diags.getClient();
654      Diags.setClient(&Client, false);
655    }
656  }
657
658  ~CaptureDroppedDiagnostics() {
659    if (Diags.getClient() == &Client)
660      Diags.setClient(PreviousClient, !!OwningPreviousClient.release());
661  }
662};
663
664} // namespace
665
666static ASTUnit::StandaloneDiagnostic
667makeStandaloneDiagnostic(const LangOptions &LangOpts,
668                         const StoredDiagnostic &InDiag);
669
670void StoredDiagnosticConsumer::HandleDiagnostic(DiagnosticsEngine::Level Level,
671                                                const Diagnostic &Info) {
672  // Default implementation (Warnings/errors count).
673  DiagnosticConsumer::HandleDiagnostic(Level, Info);
674
675  // Only record the diagnostic if it's part of the source manager we know
676  // about. This effectively drops diagnostics from modules we're building.
677  // FIXME: In the long run, ee don't want to drop source managers from modules.
678  if (!Info.hasSourceManager() || &Info.getSourceManager() == SourceMgr) {
679    StoredDiagnostic *ResultDiag = nullptr;
680    if (StoredDiags) {
681      StoredDiags->emplace_back(Level, Info);
682      ResultDiag = &StoredDiags->back();
683    }
684
685    if (StandaloneDiags) {
686      llvm::Optional<StoredDiagnostic> StoredDiag = None;
687      if (!ResultDiag) {
688        StoredDiag.emplace(Level, Info);
689        ResultDiag = StoredDiag.getPointer();
690      }
691      StandaloneDiags->push_back(
692          makeStandaloneDiagnostic(*LangOpts, *ResultDiag));
693    }
694  }
695}
696
697IntrusiveRefCntPtr<ASTReader> ASTUnit::getASTReader() const {
698  return Reader;
699}
700
701ASTMutationListener *ASTUnit::getASTMutationListener() {
702  if (WriterData)
703    return &WriterData->Writer;
704  return nullptr;
705}
706
707ASTDeserializationListener *ASTUnit::getDeserializationListener() {
708  if (WriterData)
709    return &WriterData->Writer;
710  return nullptr;
711}
712
713std::unique_ptr<llvm::MemoryBuffer>
714ASTUnit::getBufferForFile(StringRef Filename, std::string *ErrorStr) {
715  assert(FileMgr);
716  auto Buffer = FileMgr->getBufferForFile(Filename, UserFilesAreVolatile);
717  if (Buffer)
718    return std::move(*Buffer);
719  if (ErrorStr)
720    *ErrorStr = Buffer.getError().message();
721  return nullptr;
722}
723
724/// Configure the diagnostics object for use with ASTUnit.
725void ASTUnit::ConfigureDiags(IntrusiveRefCntPtr<DiagnosticsEngine> Diags,
726                             ASTUnit &AST, bool CaptureDiagnostics) {
727   (0) . __assert_fail ("Diags.get() && \"no DiagnosticsEngine was provided\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 727, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(Diags.get() && "no DiagnosticsEngine was provided");
728  if (CaptureDiagnostics)
729    Diags->setClient(new StoredDiagnosticConsumer(&AST.StoredDiagnostics, nullptr));
730}
731
732std::unique_ptr<ASTUnit> ASTUnit::LoadFromASTFile(
733    const std::string &Filename, const PCHContainerReader &PCHContainerRdr,
734    WhatToLoad ToLoad, IntrusiveRefCntPtr<DiagnosticsEngine> Diags,
735    const FileSystemOptions &FileSystemOpts, bool UseDebugInfo,
736    bool OnlyLocalDecls, ArrayRef<RemappedFile> RemappedFiles,
737    bool CaptureDiagnostics, bool AllowPCHWithCompilerErrors,
738    bool UserFilesAreVolatile) {
739  std::unique_ptr<ASTUnit> AST(new ASTUnit(true));
740
741  // Recover resources if we crash before exiting this method.
742  llvm::CrashRecoveryContextCleanupRegistrar<ASTUnit>
743    ASTUnitCleanup(AST.get());
744  llvm::CrashRecoveryContextCleanupRegistrar<DiagnosticsEngine,
745    llvm::CrashRecoveryContextReleaseRefCleanup<DiagnosticsEngine>>
746    DiagCleanup(Diags.get());
747
748  ConfigureDiags(Diags, *AST, CaptureDiagnostics);
749
750  AST->LangOpts = std::make_shared<LangOptions>();
751  AST->OnlyLocalDecls = OnlyLocalDecls;
752  AST->CaptureDiagnostics = CaptureDiagnostics;
753  AST->Diagnostics = Diags;
754  IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS =
755      llvm::vfs::getRealFileSystem();
756  AST->FileMgr = new FileManager(FileSystemOpts, VFS);
757  AST->UserFilesAreVolatile = UserFilesAreVolatile;
758  AST->SourceMgr = new SourceManager(AST->getDiagnostics(),
759                                     AST->getFileManager(),
760                                     UserFilesAreVolatile);
761  AST->ModuleCache = new InMemoryModuleCache;
762  AST->HSOpts = std::make_shared<HeaderSearchOptions>();
763  AST->HSOpts->ModuleFormat = PCHContainerRdr.getFormat();
764  AST->HeaderInfo.reset(new HeaderSearch(AST->HSOpts,
765                                         AST->getSourceManager(),
766                                         AST->getDiagnostics(),
767                                         AST->getLangOpts(),
768                                         /*Target=*/nullptr));
769  AST->PPOpts = std::make_shared<PreprocessorOptions>();
770
771  for (const auto &RemappedFile : RemappedFiles)
772    AST->PPOpts->addRemappedFile(RemappedFile.first, RemappedFile.second);
773
774  // Gather Info for preprocessor construction later on.
775
776  HeaderSearch &HeaderInfo = *AST->HeaderInfo;
777  unsigned Counter;
778
779  AST->PP = std::make_shared<Preprocessor>(
780      AST->PPOpts, AST->getDiagnostics(), *AST->LangOpts,
781      AST->getSourceManager(), HeaderInfo, AST->ModuleLoader,
782      /*IILookup=*/nullptr,
783      /*OwnsHeaderSearch=*/false);
784  Preprocessor &PP = *AST->PP;
785
786  if (ToLoad >= LoadASTOnly)
787    AST->Ctx = new ASTContext(*AST->LangOpts, AST->getSourceManager(),
788                              PP.getIdentifierTable(), PP.getSelectorTable(),
789                              PP.getBuiltinInfo());
790
791  bool disableValid = false;
792  if (::getenv("LIBCLANG_DISABLE_PCH_VALIDATION"))
793    disableValid = true;
794  AST->Reader = new ASTReader(
795      PP, *AST->ModuleCache, AST->Ctx.get(), PCHContainerRdr, {},
796      /*isysroot=*/"",
797      /*DisableValidation=*/disableValid, AllowPCHWithCompilerErrors);
798
799  AST->Reader->setListener(llvm::make_unique<ASTInfoCollector>(
800      *AST->PP, AST->Ctx.get(), *AST->HSOpts, *AST->PPOpts, *AST->LangOpts,
801      AST->TargetOpts, AST->Target, Counter));
802
803  // Attach the AST reader to the AST context as an external AST
804  // source, so that declarations will be deserialized from the
805  // AST file as needed.
806  // We need the external source to be set up before we read the AST, because
807  // eagerly-deserialized declarations may use it.
808  if (AST->Ctx)
809    AST->Ctx->setExternalSource(AST->Reader);
810
811  switch (AST->Reader->ReadAST(Filename, serialization::MK_MainFile,
812                          SourceLocation(), ASTReader::ARR_None)) {
813  case ASTReader::Success:
814    break;
815
816  case ASTReader::Failure:
817  case ASTReader::Missing:
818  case ASTReader::OutOfDate:
819  case ASTReader::VersionMismatch:
820  case ASTReader::ConfigurationMismatch:
821  case ASTReader::HadErrors:
822    AST->getDiagnostics().Report(diag::err_fe_unable_to_load_pch);
823    return nullptr;
824  }
825
826  AST->OriginalSourceFile = AST->Reader->getOriginalSourceFile();
827
828  PP.setCounterValue(Counter);
829
830  // Create an AST consumer, even though it isn't used.
831  if (ToLoad >= LoadASTOnly)
832    AST->Consumer.reset(new ASTConsumer);
833
834  // Create a semantic analysis object and tell the AST reader about it.
835  if (ToLoad >= LoadEverything) {
836    AST->TheSema.reset(new Sema(PP, *AST->Ctx, *AST->Consumer));
837    AST->TheSema->Initialize();
838    AST->Reader->InitializeSema(*AST->TheSema);
839  }
840
841  // Tell the diagnostic client that we have started a source file.
842  AST->getDiagnostics().getClient()->BeginSourceFile(PP.getLangOpts(), &PP);
843
844  return AST;
845}
846
847/// Add the given macro to the hash of all top-level entities.
848static void AddDefinedMacroToHash(const Token &MacroNameTok, unsigned &Hash) {
849  Hash = llvm::djbHash(MacroNameTok.getIdentifierInfo()->getName(), Hash);
850}
851
852namespace {
853
854/// Preprocessor callback class that updates a hash value with the names
855/// of all macros that have been defined by the translation unit.
856class MacroDefinitionTrackerPPCallbacks : public PPCallbacks {
857  unsigned &Hash;
858
859public:
860  explicit MacroDefinitionTrackerPPCallbacks(unsigned &Hash) : Hash(Hash) {}
861
862  void MacroDefined(const Token &MacroNameTok,
863                    const MacroDirective *MD) override {
864    AddDefinedMacroToHash(MacroNameTok, Hash);
865  }
866};
867
868} // namespace
869
870/// Add the given declaration to the hash of all top-level entities.
871static void AddTopLevelDeclarationToHash(Decl *D, unsigned &Hash) {
872  if (!D)
873    return;
874
875  DeclContext *DC = D->getDeclContext();
876  if (!DC)
877    return;
878
879  if (!(DC->isTranslationUnit() || DC->getLookupParent()->isTranslationUnit()))
880    return;
881
882  if (const auto *ND = dyn_cast<NamedDecl>(D)) {
883    if (const auto *EnumD = dyn_cast<EnumDecl>(D)) {
884      // For an unscoped enum include the enumerators in the hash since they
885      // enter the top-level namespace.
886      if (!EnumD->isScoped()) {
887        for (const auto *EI : EnumD->enumerators()) {
888          if (EI->getIdentifier())
889            Hash = llvm::djbHash(EI->getIdentifier()->getName(), Hash);
890        }
891      }
892    }
893
894    if (ND->getIdentifier())
895      Hash = llvm::djbHash(ND->getIdentifier()->getName(), Hash);
896    else if (DeclarationName Name = ND->getDeclName()) {
897      std::string NameStr = Name.getAsString();
898      Hash = llvm::djbHash(NameStr, Hash);
899    }
900    return;
901  }
902
903  if (const auto *ImportD = dyn_cast<ImportDecl>(D)) {
904    if (const Module *Mod = ImportD->getImportedModule()) {
905      std::string ModName = Mod->getFullModuleName();
906      Hash = llvm::djbHash(ModName, Hash);
907    }
908    return;
909  }
910}
911
912namespace {
913
914class TopLevelDeclTrackerConsumer : public ASTConsumer {
915  ASTUnit &Unit;
916  unsigned &Hash;
917
918public:
919  TopLevelDeclTrackerConsumer(ASTUnit &_Unit, unsigned &Hash)
920      : Unit(_Unit), Hash(Hash) {
921    Hash = 0;
922  }
923
924  void handleTopLevelDecl(Decl *D) {
925    if (!D)
926      return;
927
928    // FIXME: Currently ObjC method declarations are incorrectly being
929    // reported as top-level declarations, even though their DeclContext
930    // is the containing ObjC @interface/@implementation.  This is a
931    // fundamental problem in the parser right now.
932    if (isa<ObjCMethodDecl>(D))
933      return;
934
935    AddTopLevelDeclarationToHash(D, Hash);
936    Unit.addTopLevelDecl(D);
937
938    handleFileLevelDecl(D);
939  }
940
941  void handleFileLevelDecl(Decl *D) {
942    Unit.addFileLevelDecl(D);
943    if (auto *NSD = dyn_cast<NamespaceDecl>(D)) {
944      for (auto *I : NSD->decls())
945        handleFileLevelDecl(I);
946    }
947  }
948
949  bool HandleTopLevelDecl(DeclGroupRef D) override {
950    for (auto *TopLevelDecl : D)
951      handleTopLevelDecl(TopLevelDecl);
952    return true;
953  }
954
955  // We're not interested in "interesting" decls.
956  void HandleInterestingDecl(DeclGroupRef) override {}
957
958  void HandleTopLevelDeclInObjCContainer(DeclGroupRef D) override {
959    for (auto *TopLevelDecl : D)
960      handleTopLevelDecl(TopLevelDecl);
961  }
962
963  ASTMutationListener *GetASTMutationListener() override {
964    return Unit.getASTMutationListener();
965  }
966
967  ASTDeserializationListener *GetASTDeserializationListener() override {
968    return Unit.getDeserializationListener();
969  }
970};
971
972class TopLevelDeclTrackerAction : public ASTFrontendAction {
973public:
974  ASTUnit &Unit;
975
976  std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI,
977                                                 StringRef InFile) override {
978    CI.getPreprocessor().addPPCallbacks(
979        llvm::make_unique<MacroDefinitionTrackerPPCallbacks>(
980                                           Unit.getCurrentTopLevelHashValue()));
981    return llvm::make_unique<TopLevelDeclTrackerConsumer>(
982        Unit, Unit.getCurrentTopLevelHashValue());
983  }
984
985public:
986  TopLevelDeclTrackerAction(ASTUnit &_Unit) : Unit(_Unit) {}
987
988  bool hasCodeCompletionSupport() const override { return false; }
989
990  TranslationUnitKind getTranslationUnitKind() override {
991    return Unit.getTranslationUnitKind();
992  }
993};
994
995class ASTUnitPreambleCallbacks : public PreambleCallbacks {
996public:
997  unsigned getHash() const { return Hash; }
998
999  std::vector<Decl *> takeTopLevelDecls() { return std::move(TopLevelDecls); }
1000
1001  std::vector<serialization::DeclID> takeTopLevelDeclIDs() {
1002    return std::move(TopLevelDeclIDs);
1003  }
1004
1005  void AfterPCHEmitted(ASTWriter &Writer) override {
1006    TopLevelDeclIDs.reserve(TopLevelDecls.size());
1007    for (const auto *D : TopLevelDecls) {
1008      // Invalid top-level decls may not have been serialized.
1009      if (D->isInvalidDecl())
1010        continue;
1011      TopLevelDeclIDs.push_back(Writer.getDeclID(D));
1012    }
1013  }
1014
1015  void HandleTopLevelDecl(DeclGroupRef DG) override {
1016    for (auto *D : DG) {
1017      // FIXME: Currently ObjC method declarations are incorrectly being
1018      // reported as top-level declarations, even though their DeclContext
1019      // is the containing ObjC @interface/@implementation.  This is a
1020      // fundamental problem in the parser right now.
1021      if (isa<ObjCMethodDecl>(D))
1022        continue;
1023      AddTopLevelDeclarationToHash(D, Hash);
1024      TopLevelDecls.push_back(D);
1025    }
1026  }
1027
1028  std::unique_ptr<PPCallbacks> createPPCallbacks() override {
1029    return llvm::make_unique<MacroDefinitionTrackerPPCallbacks>(Hash);
1030  }
1031
1032private:
1033  unsigned Hash = 0;
1034  std::vector<Decl *> TopLevelDecls;
1035  std::vector<serialization::DeclID> TopLevelDeclIDs;
1036  llvm::SmallVector<ASTUnit::StandaloneDiagnostic, 4> PreambleDiags;
1037};
1038
1039} // namespace
1040
1041static bool isNonDriverDiag(const StoredDiagnostic &StoredDiag) {
1042  return StoredDiag.getLocation().isValid();
1043}
1044
1045static void
1046checkAndRemoveNonDriverDiags(SmallVectorImpl<StoredDiagnostic> &StoredDiags) {
1047  // Get rid of stored diagnostics except the ones from the driver which do not
1048  // have a source location.
1049  StoredDiags.erase(
1050      std::remove_if(StoredDiags.begin(), StoredDiags.end(), isNonDriverDiag),
1051      StoredDiags.end());
1052}
1053
1054static void checkAndSanitizeDiags(SmallVectorImpl<StoredDiagnostic> &
1055                                                              StoredDiagnostics,
1056                                  SourceManager &SM) {
1057  // The stored diagnostic has the old source manager in it; update
1058  // the locations to refer into the new source manager. Since we've
1059  // been careful to make sure that the source manager's state
1060  // before and after are identical, so that we can reuse the source
1061  // location itself.
1062  for (auto &SD : StoredDiagnostics) {
1063    if (SD.getLocation().isValid()) {
1064      FullSourceLoc Loc(SD.getLocation(), SM);
1065      SD.setLocation(Loc);
1066    }
1067  }
1068}
1069
1070/// Parse the source file into a translation unit using the given compiler
1071/// invocation, replacing the current translation unit.
1072///
1073/// \returns True if a failure occurred that causes the ASTUnit not to
1074/// contain any translation-unit information, false otherwise.
1075bool ASTUnit::Parse(std::shared_ptr<PCHContainerOperations> PCHContainerOps,
1076                    std::unique_ptr<llvm::MemoryBuffer> OverrideMainBuffer,
1077                    IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS) {
1078  if (!Invocation)
1079    return true;
1080
1081  if (VFS && FileMgr)
1082     (0) . __assert_fail ("VFS == &FileMgr->getVirtualFileSystem() && \"VFS passed to Parse and VFS in FileMgr are different\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1083, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(VFS == &FileMgr->getVirtualFileSystem() &&
1083 (0) . __assert_fail ("VFS == &FileMgr->getVirtualFileSystem() && \"VFS passed to Parse and VFS in FileMgr are different\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1083, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">           "VFS passed to Parse and VFS in FileMgr are different");
1084
1085  auto CCInvocation = std::make_shared<CompilerInvocation>(*Invocation);
1086  if (OverrideMainBuffer) {
1087     (0) . __assert_fail ("Preamble && \"No preamble was built, but OverrideMainBuffer is not null\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1088, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(Preamble &&
1088 (0) . __assert_fail ("Preamble && \"No preamble was built, but OverrideMainBuffer is not null\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1088, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">           "No preamble was built, but OverrideMainBuffer is not null");
1089    Preamble->AddImplicitPreamble(*CCInvocation, VFS, OverrideMainBuffer.get());
1090    // VFS may have changed...
1091  }
1092
1093  // Create the compiler instance to use for building the AST.
1094  std::unique_ptr<CompilerInstance> Clang(
1095      new CompilerInstance(std::move(PCHContainerOps)));
1096
1097  // Ensure that Clang has a FileManager with the right VFS, which may have
1098  // changed above in AddImplicitPreamble.  If VFS is nullptr, rely on
1099  // createFileManager to create one.
1100  if (VFS && FileMgr && &FileMgr->getVirtualFileSystem() == VFS)
1101    Clang->setFileManager(&*FileMgr);
1102  else
1103    FileMgr = Clang->createFileManager(std::move(VFS));
1104
1105  // Recover resources if we crash before exiting this method.
1106  llvm::CrashRecoveryContextCleanupRegistrar<CompilerInstance>
1107    CICleanup(Clang.get());
1108
1109  Clang->setInvocation(CCInvocation);
1110  OriginalSourceFile = Clang->getFrontendOpts().Inputs[0].getFile();
1111
1112  // Set up diagnostics, capturing any diagnostics that would
1113  // otherwise be dropped.
1114  Clang->setDiagnostics(&getDiagnostics());
1115
1116  // Create the target instance.
1117  Clang->setTarget(TargetInfo::CreateTargetInfo(
1118      Clang->getDiagnostics(), Clang->getInvocation().TargetOpts));
1119  if (!Clang->hasTarget())
1120    return true;
1121
1122  // Inform the target of the language options.
1123  //
1124  // FIXME: We shouldn't need to do this, the target should be immutable once
1125  // created. This complexity should be lifted elsewhere.
1126  Clang->getTarget().adjust(Clang->getLangOpts());
1127
1128   (0) . __assert_fail ("Clang->getFrontendOpts().Inputs.size() == 1 && \"Invocation must have exactly one source file!\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1129, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(Clang->getFrontendOpts().Inputs.size() == 1 &&
1129 (0) . __assert_fail ("Clang->getFrontendOpts().Inputs.size() == 1 && \"Invocation must have exactly one source file!\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1129, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">         "Invocation must have exactly one source file!");
1130   (0) . __assert_fail ("Clang->getFrontendOpts().Inputs[0].getKind().getFormat() == InputKind..Source && \"FIXME. AST inputs not yet supported here!\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1132, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(Clang->getFrontendOpts().Inputs[0].getKind().getFormat() ==
1131 (0) . __assert_fail ("Clang->getFrontendOpts().Inputs[0].getKind().getFormat() == InputKind..Source && \"FIXME. AST inputs not yet supported here!\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1132, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">             InputKind::Source &&
1132 (0) . __assert_fail ("Clang->getFrontendOpts().Inputs[0].getKind().getFormat() == InputKind..Source && \"FIXME. AST inputs not yet supported here!\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1132, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">         "FIXME: AST inputs not yet supported here!");
1133   (0) . __assert_fail ("Clang->getFrontendOpts().Inputs[0].getKind().getLanguage() != InputKind..LLVM_IR && \"IR inputs not support here!\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1135, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(Clang->getFrontendOpts().Inputs[0].getKind().getLanguage() !=
1134 (0) . __assert_fail ("Clang->getFrontendOpts().Inputs[0].getKind().getLanguage() != InputKind..LLVM_IR && \"IR inputs not support here!\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1135, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">             InputKind::LLVM_IR &&
1135 (0) . __assert_fail ("Clang->getFrontendOpts().Inputs[0].getKind().getLanguage() != InputKind..LLVM_IR && \"IR inputs not support here!\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1135, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">         "IR inputs not support here!");
1136
1137  // Configure the various subsystems.
1138  LangOpts = Clang->getInvocation().LangOpts;
1139  FileSystemOpts = Clang->getFileSystemOpts();
1140
1141  ResetForParse();
1142
1143  SourceMgr = new SourceManager(getDiagnostics(), *FileMgr,
1144                                UserFilesAreVolatile);
1145  if (!OverrideMainBuffer) {
1146    checkAndRemoveNonDriverDiags(StoredDiagnostics);
1147    TopLevelDeclsInPreamble.clear();
1148  }
1149
1150  // Create a file manager object to provide access to and cache the filesystem.
1151  Clang->setFileManager(&getFileManager());
1152
1153  // Create the source manager.
1154  Clang->setSourceManager(&getSourceManager());
1155
1156  // If the main file has been overridden due to the use of a preamble,
1157  // make that override happen and introduce the preamble.
1158  if (OverrideMainBuffer) {
1159    // The stored diagnostic has the old source manager in it; update
1160    // the locations to refer into the new source manager. Since we've
1161    // been careful to make sure that the source manager's state
1162    // before and after are identical, so that we can reuse the source
1163    // location itself.
1164    checkAndSanitizeDiags(StoredDiagnostics, getSourceManager());
1165
1166    // Keep track of the override buffer;
1167    SavedMainFileBuffer = std::move(OverrideMainBuffer);
1168  }
1169
1170  std::unique_ptr<TopLevelDeclTrackerAction> Act(
1171      new TopLevelDeclTrackerAction(*this));
1172
1173  // Recover resources if we crash before exiting this method.
1174  llvm::CrashRecoveryContextCleanupRegistrar<TopLevelDeclTrackerAction>
1175    ActCleanup(Act.get());
1176
1177  if (!Act->BeginSourceFile(*Clang.get(), Clang->getFrontendOpts().Inputs[0]))
1178    goto error;
1179
1180  if (SavedMainFileBuffer)
1181    TranslateStoredDiagnostics(getFileManager(), getSourceManager(),
1182                               PreambleDiagnostics, StoredDiagnostics);
1183  else
1184    PreambleSrcLocCache.clear();
1185
1186  if (!Act->Execute())
1187    goto error;
1188
1189  transferASTDataFromCompilerInstance(*Clang);
1190
1191  Act->EndSourceFile();
1192
1193  FailedParseDiagnostics.clear();
1194
1195  return false;
1196
1197error:
1198  // Remove the overridden buffer we used for the preamble.
1199  SavedMainFileBuffer = nullptr;
1200
1201  // Keep the ownership of the data in the ASTUnit because the client may
1202  // want to see the diagnostics.
1203  transferASTDataFromCompilerInstance(*Clang);
1204  FailedParseDiagnostics.swap(StoredDiagnostics);
1205  StoredDiagnostics.clear();
1206  NumStoredDiagnosticsFromDriver = 0;
1207  return true;
1208}
1209
1210static std::pair<unsigned, unsigned>
1211makeStandaloneRange(CharSourceRange Range, const SourceManager &SM,
1212                    const LangOptions &LangOpts) {
1213  CharSourceRange FileRange = Lexer::makeFileCharRange(Range, SM, LangOpts);
1214  unsigned Offset = SM.getFileOffset(FileRange.getBegin());
1215  unsigned EndOffset = SM.getFileOffset(FileRange.getEnd());
1216  return std::make_pair(Offset, EndOffset);
1217}
1218
1219static ASTUnit::StandaloneFixIt makeStandaloneFixIt(const SourceManager &SM,
1220                                                    const LangOptions &LangOpts,
1221                                                    const FixItHint &InFix) {
1222  ASTUnit::StandaloneFixIt OutFix;
1223  OutFix.RemoveRange = makeStandaloneRange(InFix.RemoveRange, SM, LangOpts);
1224  OutFix.InsertFromRange = makeStandaloneRange(InFix.InsertFromRange, SM,
1225                                               LangOpts);
1226  OutFix.CodeToInsert = InFix.CodeToInsert;
1227  OutFix.BeforePreviousInsertions = InFix.BeforePreviousInsertions;
1228  return OutFix;
1229}
1230
1231static ASTUnit::StandaloneDiagnostic
1232makeStandaloneDiagnostic(const LangOptions &LangOpts,
1233                         const StoredDiagnostic &InDiag) {
1234  ASTUnit::StandaloneDiagnostic OutDiag;
1235  OutDiag.ID = InDiag.getID();
1236  OutDiag.Level = InDiag.getLevel();
1237  OutDiag.Message = InDiag.getMessage();
1238  OutDiag.LocOffset = 0;
1239  if (InDiag.getLocation().isInvalid())
1240    return OutDiag;
1241  const SourceManager &SM = InDiag.getLocation().getManager();
1242  SourceLocation FileLoc = SM.getFileLoc(InDiag.getLocation());
1243  OutDiag.Filename = SM.getFilename(FileLoc);
1244  if (OutDiag.Filename.empty())
1245    return OutDiag;
1246  OutDiag.LocOffset = SM.getFileOffset(FileLoc);
1247  for (const auto &Range : InDiag.getRanges())
1248    OutDiag.Ranges.push_back(makeStandaloneRange(Range, SM, LangOpts));
1249  for (const auto &FixIt : InDiag.getFixIts())
1250    OutDiag.FixIts.push_back(makeStandaloneFixIt(SM, LangOpts, FixIt));
1251
1252  return OutDiag;
1253}
1254
1255/// Attempt to build or re-use a precompiled preamble when (re-)parsing
1256/// the source file.
1257///
1258/// This routine will compute the preamble of the main source file. If a
1259/// non-trivial preamble is found, it will precompile that preamble into a
1260/// precompiled header so that the precompiled preamble can be used to reduce
1261/// reparsing time. If a precompiled preamble has already been constructed,
1262/// this routine will determine if it is still valid and, if so, avoid
1263/// rebuilding the precompiled preamble.
1264///
1265/// \param AllowRebuild When true (the default), this routine is
1266/// allowed to rebuild the precompiled preamble if it is found to be
1267/// out-of-date.
1268///
1269/// \param MaxLines When non-zero, the maximum number of lines that
1270/// can occur within the preamble.
1271///
1272/// \returns If the precompiled preamble can be used, returns a newly-allocated
1273/// buffer that should be used in place of the main file when doing so.
1274/// Otherwise, returns a NULL pointer.
1275std::unique_ptr<llvm::MemoryBuffer>
1276ASTUnit::getMainBufferWithPrecompiledPreamble(
1277    std::shared_ptr<PCHContainerOperations> PCHContainerOps,
1278    CompilerInvocation &PreambleInvocationIn,
1279    IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS, bool AllowRebuild,
1280    unsigned MaxLines) {
1281  auto MainFilePath =
1282      PreambleInvocationIn.getFrontendOpts().Inputs[0].getFile();
1283  std::unique_ptr<llvm::MemoryBuffer> MainFileBuffer =
1284      getBufferForFileHandlingRemapping(PreambleInvocationIn, VFS.get(),
1285                                        MainFilePath, UserFilesAreVolatile);
1286  if (!MainFileBuffer)
1287    return nullptr;
1288
1289  PreambleBounds Bounds =
1290      ComputePreambleBounds(*PreambleInvocationIn.getLangOpts(),
1291                            MainFileBuffer.get(), MaxLines);
1292  if (!Bounds.Size)
1293    return nullptr;
1294
1295  if (Preamble) {
1296    if (Preamble->CanReuse(PreambleInvocationIn, MainFileBuffer.get(), Bounds,
1297                           VFS.get())) {
1298      // Okay! We can re-use the precompiled preamble.
1299
1300      // Set the state of the diagnostic object to mimic its state
1301      // after parsing the preamble.
1302      getDiagnostics().Reset();
1303      ProcessWarningOptions(getDiagnostics(),
1304                            PreambleInvocationIn.getDiagnosticOpts());
1305      getDiagnostics().setNumWarnings(NumWarningsInPreamble);
1306
1307      PreambleRebuildCounter = 1;
1308      return MainFileBuffer;
1309    } else {
1310      Preamble.reset();
1311      PreambleDiagnostics.clear();
1312      TopLevelDeclsInPreamble.clear();
1313      PreambleSrcLocCache.clear();
1314      PreambleRebuildCounter = 1;
1315    }
1316  }
1317
1318  // If the preamble rebuild counter > 1, it's because we previously
1319  // failed to build a preamble and we're not yet ready to try
1320  // again. Decrement the counter and return a failure.
1321  if (PreambleRebuildCounter > 1) {
1322    --PreambleRebuildCounter;
1323    return nullptr;
1324  }
1325
1326   (0) . __assert_fail ("!Preamble && \"No Preamble should be stored at that point\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1326, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(!Preamble && "No Preamble should be stored at that point");
1327  // If we aren't allowed to rebuild the precompiled preamble, just
1328  // return now.
1329  if (!AllowRebuild)
1330    return nullptr;
1331
1332  SmallVector<StandaloneDiagnostic, 4> NewPreambleDiagsStandalone;
1333  SmallVector<StoredDiagnostic, 4> NewPreambleDiags;
1334  ASTUnitPreambleCallbacks Callbacks;
1335  {
1336    llvm::Optional<CaptureDroppedDiagnostics> Capture;
1337    if (CaptureDiagnostics)
1338      Capture.emplace(/*RequestCapture=*/true, *Diagnostics, &NewPreambleDiags,
1339                      &NewPreambleDiagsStandalone);
1340
1341    // We did not previously compute a preamble, or it can't be reused anyway.
1342    SimpleTimer PreambleTimer(WantTiming);
1343    PreambleTimer.setOutput("Precompiling preamble");
1344
1345    const bool PreviousSkipFunctionBodies =
1346        PreambleInvocationIn.getFrontendOpts().SkipFunctionBodies;
1347    if (SkipFunctionBodies == SkipFunctionBodiesScope::Preamble)
1348      PreambleInvocationIn.getFrontendOpts().SkipFunctionBodies = true;
1349
1350    llvm::ErrorOr<PrecompiledPreamble> NewPreamble = PrecompiledPreamble::Build(
1351        PreambleInvocationIn, MainFileBuffer.get(), Bounds, *Diagnostics, VFS,
1352        PCHContainerOps, /*StoreInMemory=*/false, Callbacks);
1353
1354    PreambleInvocationIn.getFrontendOpts().SkipFunctionBodies =
1355        PreviousSkipFunctionBodies;
1356
1357    if (NewPreamble) {
1358      Preamble = std::move(*NewPreamble);
1359      PreambleRebuildCounter = 1;
1360    } else {
1361      switch (static_cast<BuildPreambleError>(NewPreamble.getError().value())) {
1362      case BuildPreambleError::CouldntCreateTempFile:
1363        // Try again next time.
1364        PreambleRebuildCounter = 1;
1365        return nullptr;
1366      case BuildPreambleError::CouldntCreateTargetInfo:
1367      case BuildPreambleError::BeginSourceFileFailed:
1368      case BuildPreambleError::CouldntEmitPCH:
1369        // These erros are more likely to repeat, retry after some period.
1370        PreambleRebuildCounter = DefaultPreambleRebuildInterval;
1371        return nullptr;
1372      }
1373      llvm_unreachable("unexpected BuildPreambleError");
1374    }
1375  }
1376
1377   (0) . __assert_fail ("Preamble && \"Preamble wasn't built\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1377, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(Preamble && "Preamble wasn't built");
1378
1379  TopLevelDecls.clear();
1380  TopLevelDeclsInPreamble = Callbacks.takeTopLevelDeclIDs();
1381  PreambleTopLevelHashValue = Callbacks.getHash();
1382
1383  NumWarningsInPreamble = getDiagnostics().getNumWarnings();
1384
1385  checkAndRemoveNonDriverDiags(NewPreambleDiags);
1386  StoredDiagnostics = std::move(NewPreambleDiags);
1387  PreambleDiagnostics = std::move(NewPreambleDiagsStandalone);
1388
1389  // If the hash of top-level entities differs from the hash of the top-level
1390  // entities the last time we rebuilt the preamble, clear out the completion
1391  // cache.
1392  if (CurrentTopLevelHashValue != PreambleTopLevelHashValue) {
1393    CompletionCacheTopLevelHashValue = 0;
1394    PreambleTopLevelHashValue = CurrentTopLevelHashValue;
1395  }
1396
1397  return MainFileBuffer;
1398}
1399
1400void ASTUnit::RealizeTopLevelDeclsFromPreamble() {
1401   (0) . __assert_fail ("Preamble && \"Should only be called when preamble was built\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1401, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(Preamble && "Should only be called when preamble was built");
1402
1403  std::vector<Decl *> Resolved;
1404  Resolved.reserve(TopLevelDeclsInPreamble.size());
1405  ExternalASTSource &Source = *getASTContext().getExternalSource();
1406  for (const auto TopLevelDecl : TopLevelDeclsInPreamble) {
1407    // Resolve the declaration ID to an actual declaration, possibly
1408    // deserializing the declaration in the process.
1409    if (Decl *D = Source.GetExternalDecl(TopLevelDecl))
1410      Resolved.push_back(D);
1411  }
1412  TopLevelDeclsInPreamble.clear();
1413  TopLevelDecls.insert(TopLevelDecls.begin(), Resolved.begin(), Resolved.end());
1414}
1415
1416void ASTUnit::transferASTDataFromCompilerInstance(CompilerInstance &CI) {
1417  // Steal the created target, context, and preprocessor if they have been
1418  // created.
1419   (0) . __assert_fail ("CI.hasInvocation() && \"missing invocation\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1419, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(CI.hasInvocation() && "missing invocation");
1420  LangOpts = CI.getInvocation().LangOpts;
1421  TheSema = CI.takeSema();
1422  Consumer = CI.takeASTConsumer();
1423  if (CI.hasASTContext())
1424    Ctx = &CI.getASTContext();
1425  if (CI.hasPreprocessor())
1426    PP = CI.getPreprocessorPtr();
1427  CI.setSourceManager(nullptr);
1428  CI.setFileManager(nullptr);
1429  if (CI.hasTarget())
1430    Target = &CI.getTarget();
1431  Reader = CI.getModuleManager();
1432  HadModuleLoaderFatalFailure = CI.hadModuleLoaderFatalFailure();
1433}
1434
1435StringRef ASTUnit::getMainFileName() const {
1436  if (Invocation && !Invocation->getFrontendOpts().Inputs.empty()) {
1437    const FrontendInputFile &Input = Invocation->getFrontendOpts().Inputs[0];
1438    if (Input.isFile())
1439      return Input.getFile();
1440    else
1441      return Input.getBuffer()->getBufferIdentifier();
1442  }
1443
1444  if (SourceMgr) {
1445    if (const FileEntry *
1446          FE = SourceMgr->getFileEntryForID(SourceMgr->getMainFileID()))
1447      return FE->getName();
1448  }
1449
1450  return {};
1451}
1452
1453StringRef ASTUnit::getASTFileName() const {
1454  if (!isMainFileAST())
1455    return {};
1456
1457  serialization::ModuleFile &
1458    Mod = Reader->getModuleManager().getPrimaryModule();
1459  return Mod.FileName;
1460}
1461
1462std::unique_ptr<ASTUnit>
1463ASTUnit::create(std::shared_ptr<CompilerInvocation> CI,
1464                IntrusiveRefCntPtr<DiagnosticsEngine> Diags,
1465                bool CaptureDiagnostics, bool UserFilesAreVolatile) {
1466  std::unique_ptr<ASTUnit> AST(new ASTUnit(false));
1467  ConfigureDiags(Diags, *AST, CaptureDiagnostics);
1468  IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS =
1469      createVFSFromCompilerInvocation(*CI, *Diags);
1470  AST->Diagnostics = Diags;
1471  AST->FileSystemOpts = CI->getFileSystemOpts();
1472  AST->Invocation = std::move(CI);
1473  AST->FileMgr = new FileManager(AST->FileSystemOpts, VFS);
1474  AST->UserFilesAreVolatile = UserFilesAreVolatile;
1475  AST->SourceMgr = new SourceManager(AST->getDiagnostics(), *AST->FileMgr,
1476                                     UserFilesAreVolatile);
1477  AST->ModuleCache = new InMemoryModuleCache;
1478
1479  return AST;
1480}
1481
1482ASTUnit *ASTUnit::LoadFromCompilerInvocationAction(
1483    std::shared_ptr<CompilerInvocation> CI,
1484    std::shared_ptr<PCHContainerOperations> PCHContainerOps,
1485    IntrusiveRefCntPtr<DiagnosticsEngine> Diags, FrontendAction *Action,
1486    ASTUnit *Unit, bool Persistent, StringRef ResourceFilesPath,
1487    bool OnlyLocalDecls, bool CaptureDiagnostics,
1488    unsigned PrecompilePreambleAfterNParses, bool CacheCodeCompletionResults,
1489    bool IncludeBriefCommentsInCodeCompletion, bool UserFilesAreVolatile,
1490    std::unique_ptr<ASTUnit> *ErrAST) {
1491   (0) . __assert_fail ("CI && \"A CompilerInvocation is required\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1491, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(CI && "A CompilerInvocation is required");
1492
1493  std::unique_ptr<ASTUnit> OwnAST;
1494  ASTUnit *AST = Unit;
1495  if (!AST) {
1496    // Create the AST unit.
1497    OwnAST = create(CI, Diags, CaptureDiagnostics, UserFilesAreVolatile);
1498    AST = OwnAST.get();
1499    if (!AST)
1500      return nullptr;
1501  }
1502
1503  if (!ResourceFilesPath.empty()) {
1504    // Override the resources path.
1505    CI->getHeaderSearchOpts().ResourceDir = ResourceFilesPath;
1506  }
1507  AST->OnlyLocalDecls = OnlyLocalDecls;
1508  AST->CaptureDiagnostics = CaptureDiagnostics;
1509  if (PrecompilePreambleAfterNParses > 0)
1510    AST->PreambleRebuildCounter = PrecompilePreambleAfterNParses;
1511  AST->TUKind = Action ? Action->getTranslationUnitKind() : TU_Complete;
1512  AST->ShouldCacheCodeCompletionResults = CacheCodeCompletionResults;
1513  AST->IncludeBriefCommentsInCodeCompletion
1514    = IncludeBriefCommentsInCodeCompletion;
1515
1516  // Recover resources if we crash before exiting this method.
1517  llvm::CrashRecoveryContextCleanupRegistrar<ASTUnit>
1518    ASTUnitCleanup(OwnAST.get());
1519  llvm::CrashRecoveryContextCleanupRegistrar<DiagnosticsEngine,
1520    llvm::CrashRecoveryContextReleaseRefCleanup<DiagnosticsEngine>>
1521    DiagCleanup(Diags.get());
1522
1523  // We'll manage file buffers ourselves.
1524  CI->getPreprocessorOpts().RetainRemappedFileBuffers = true;
1525  CI->getFrontendOpts().DisableFree = false;
1526  ProcessWarningOptions(AST->getDiagnostics(), CI->getDiagnosticOpts());
1527
1528  // Create the compiler instance to use for building the AST.
1529  std::unique_ptr<CompilerInstance> Clang(
1530      new CompilerInstance(std::move(PCHContainerOps)));
1531
1532  // Recover resources if we crash before exiting this method.
1533  llvm::CrashRecoveryContextCleanupRegistrar<CompilerInstance>
1534    CICleanup(Clang.get());
1535
1536  Clang->setInvocation(std::move(CI));
1537  AST->OriginalSourceFile = Clang->getFrontendOpts().Inputs[0].getFile();
1538
1539  // Set up diagnostics, capturing any diagnostics that would
1540  // otherwise be dropped.
1541  Clang->setDiagnostics(&AST->getDiagnostics());
1542
1543  // Create the target instance.
1544  Clang->setTarget(TargetInfo::CreateTargetInfo(
1545      Clang->getDiagnostics(), Clang->getInvocation().TargetOpts));
1546  if (!Clang->hasTarget())
1547    return nullptr;
1548
1549  // Inform the target of the language options.
1550  //
1551  // FIXME: We shouldn't need to do this, the target should be immutable once
1552  // created. This complexity should be lifted elsewhere.
1553  Clang->getTarget().adjust(Clang->getLangOpts());
1554
1555   (0) . __assert_fail ("Clang->getFrontendOpts().Inputs.size() == 1 && \"Invocation must have exactly one source file!\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1556, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(Clang->getFrontendOpts().Inputs.size() == 1 &&
1556 (0) . __assert_fail ("Clang->getFrontendOpts().Inputs.size() == 1 && \"Invocation must have exactly one source file!\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1556, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">         "Invocation must have exactly one source file!");
1557   (0) . __assert_fail ("Clang->getFrontendOpts().Inputs[0].getKind().getFormat() == InputKind..Source && \"FIXME. AST inputs not yet supported here!\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1559, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(Clang->getFrontendOpts().Inputs[0].getKind().getFormat() ==
1558 (0) . __assert_fail ("Clang->getFrontendOpts().Inputs[0].getKind().getFormat() == InputKind..Source && \"FIXME. AST inputs not yet supported here!\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1559, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">             InputKind::Source &&
1559 (0) . __assert_fail ("Clang->getFrontendOpts().Inputs[0].getKind().getFormat() == InputKind..Source && \"FIXME. AST inputs not yet supported here!\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1559, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">         "FIXME: AST inputs not yet supported here!");
1560   (0) . __assert_fail ("Clang->getFrontendOpts().Inputs[0].getKind().getLanguage() != InputKind..LLVM_IR && \"IR inputs not support here!\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1562, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(Clang->getFrontendOpts().Inputs[0].getKind().getLanguage() !=
1561 (0) . __assert_fail ("Clang->getFrontendOpts().Inputs[0].getKind().getLanguage() != InputKind..LLVM_IR && \"IR inputs not support here!\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1562, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">             InputKind::LLVM_IR &&
1562 (0) . __assert_fail ("Clang->getFrontendOpts().Inputs[0].getKind().getLanguage() != InputKind..LLVM_IR && \"IR inputs not support here!\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1562, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">         "IR inputs not support here!");
1563
1564  // Configure the various subsystems.
1565  AST->TheSema.reset();
1566  AST->Ctx = nullptr;
1567  AST->PP = nullptr;
1568  AST->Reader = nullptr;
1569
1570  // Create a file manager object to provide access to and cache the filesystem.
1571  Clang->setFileManager(&AST->getFileManager());
1572
1573  // Create the source manager.
1574  Clang->setSourceManager(&AST->getSourceManager());
1575
1576  FrontendAction *Act = Action;
1577
1578  std::unique_ptr<TopLevelDeclTrackerAction> TrackerAct;
1579  if (!Act) {
1580    TrackerAct.reset(new TopLevelDeclTrackerAction(*AST));
1581    Act = TrackerAct.get();
1582  }
1583
1584  // Recover resources if we crash before exiting this method.
1585  llvm::CrashRecoveryContextCleanupRegistrar<TopLevelDeclTrackerAction>
1586    ActCleanup(TrackerAct.get());
1587
1588  if (!Act->BeginSourceFile(*Clang.get(), Clang->getFrontendOpts().Inputs[0])) {
1589    AST->transferASTDataFromCompilerInstance(*Clang);
1590    if (OwnAST && ErrAST)
1591      ErrAST->swap(OwnAST);
1592
1593    return nullptr;
1594  }
1595
1596  if (Persistent && !TrackerAct) {
1597    Clang->getPreprocessor().addPPCallbacks(
1598        llvm::make_unique<MacroDefinitionTrackerPPCallbacks>(
1599                                           AST->getCurrentTopLevelHashValue()));
1600    std::vector<std::unique_ptr<ASTConsumer>> Consumers;
1601    if (Clang->hasASTConsumer())
1602      Consumers.push_back(Clang->takeASTConsumer());
1603    Consumers.push_back(llvm::make_unique<TopLevelDeclTrackerConsumer>(
1604        *AST, AST->getCurrentTopLevelHashValue()));
1605    Clang->setASTConsumer(
1606        llvm::make_unique<MultiplexConsumer>(std::move(Consumers)));
1607  }
1608  if (!Act->Execute()) {
1609    AST->transferASTDataFromCompilerInstance(*Clang);
1610    if (OwnAST && ErrAST)
1611      ErrAST->swap(OwnAST);
1612
1613    return nullptr;
1614  }
1615
1616  // Steal the created target, context, and preprocessor.
1617  AST->transferASTDataFromCompilerInstance(*Clang);
1618
1619  Act->EndSourceFile();
1620
1621  if (OwnAST)
1622    return OwnAST.release();
1623  else
1624    return AST;
1625}
1626
1627bool ASTUnit::LoadFromCompilerInvocation(
1628    std::shared_ptr<PCHContainerOperations> PCHContainerOps,
1629    unsigned PrecompilePreambleAfterNParses,
1630    IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS) {
1631  if (!Invocation)
1632    return true;
1633
1634   (0) . __assert_fail ("VFS && \"VFS is null\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1634, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(VFS && "VFS is null");
1635
1636  // We'll manage file buffers ourselves.
1637  Invocation->getPreprocessorOpts().RetainRemappedFileBuffers = true;
1638  Invocation->getFrontendOpts().DisableFree = false;
1639  getDiagnostics().Reset();
1640  ProcessWarningOptions(getDiagnostics(), Invocation->getDiagnosticOpts());
1641
1642  std::unique_ptr<llvm::MemoryBuffer> OverrideMainBuffer;
1643  if (PrecompilePreambleAfterNParses > 0) {
1644    PreambleRebuildCounter = PrecompilePreambleAfterNParses;
1645    OverrideMainBuffer =
1646        getMainBufferWithPrecompiledPreamble(PCHContainerOps, *Invocation, VFS);
1647    getDiagnostics().Reset();
1648    ProcessWarningOptions(getDiagnostics(), Invocation->getDiagnosticOpts());
1649  }
1650
1651  SimpleTimer ParsingTimer(WantTiming);
1652  ParsingTimer.setOutput("Parsing " + getMainFileName());
1653
1654  // Recover resources if we crash before exiting this method.
1655  llvm::CrashRecoveryContextCleanupRegistrar<llvm::MemoryBuffer>
1656    MemBufferCleanup(OverrideMainBuffer.get());
1657
1658  return Parse(std::move(PCHContainerOps), std::move(OverrideMainBuffer), VFS);
1659}
1660
1661std::unique_ptr<ASTUnit> ASTUnit::LoadFromCompilerInvocation(
1662    std::shared_ptr<CompilerInvocation> CI,
1663    std::shared_ptr<PCHContainerOperations> PCHContainerOps,
1664    IntrusiveRefCntPtr<DiagnosticsEngine> Diags, FileManager *FileMgr,
1665    bool OnlyLocalDecls, bool CaptureDiagnostics,
1666    unsigned PrecompilePreambleAfterNParses, TranslationUnitKind TUKind,
1667    bool CacheCodeCompletionResults, bool IncludeBriefCommentsInCodeCompletion,
1668    bool UserFilesAreVolatile) {
1669  // Create the AST unit.
1670  std::unique_ptr<ASTUnit> AST(new ASTUnit(false));
1671  ConfigureDiags(Diags, *AST, CaptureDiagnostics);
1672  AST->Diagnostics = Diags;
1673  AST->OnlyLocalDecls = OnlyLocalDecls;
1674  AST->CaptureDiagnostics = CaptureDiagnostics;
1675  AST->TUKind = TUKind;
1676  AST->ShouldCacheCodeCompletionResults = CacheCodeCompletionResults;
1677  AST->IncludeBriefCommentsInCodeCompletion
1678    = IncludeBriefCommentsInCodeCompletion;
1679  AST->Invocation = std::move(CI);
1680  AST->FileSystemOpts = FileMgr->getFileSystemOpts();
1681  AST->FileMgr = FileMgr;
1682  AST->UserFilesAreVolatile = UserFilesAreVolatile;
1683
1684  // Recover resources if we crash before exiting this method.
1685  llvm::CrashRecoveryContextCleanupRegistrar<ASTUnit>
1686    ASTUnitCleanup(AST.get());
1687  llvm::CrashRecoveryContextCleanupRegistrar<DiagnosticsEngine,
1688    llvm::CrashRecoveryContextReleaseRefCleanup<DiagnosticsEngine>>
1689    DiagCleanup(Diags.get());
1690
1691  if (AST->LoadFromCompilerInvocation(std::move(PCHContainerOps),
1692                                      PrecompilePreambleAfterNParses,
1693                                      &AST->FileMgr->getVirtualFileSystem()))
1694    return nullptr;
1695  return AST;
1696}
1697
1698ASTUnit *ASTUnit::LoadFromCommandLine(
1699    const char **ArgBegin, const char **ArgEnd,
1700    std::shared_ptr<PCHContainerOperations> PCHContainerOps,
1701    IntrusiveRefCntPtr<DiagnosticsEngine> Diags, StringRef ResourceFilesPath,
1702    bool OnlyLocalDecls, bool CaptureDiagnostics,
1703    ArrayRef<RemappedFile> RemappedFiles, bool RemappedFilesKeepOriginalName,
1704    unsigned PrecompilePreambleAfterNParses, TranslationUnitKind TUKind,
1705    bool CacheCodeCompletionResults, bool IncludeBriefCommentsInCodeCompletion,
1706    bool AllowPCHWithCompilerErrors, SkipFunctionBodiesScope SkipFunctionBodies,
1707    bool SingleFileParse, bool UserFilesAreVolatile, bool ForSerialization,
1708    llvm::Optional<StringRef> ModuleFormat, std::unique_ptr<ASTUnit> *ErrAST,
1709    IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS) {
1710   (0) . __assert_fail ("Diags.get() && \"no DiagnosticsEngine was provided\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1710, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(Diags.get() && "no DiagnosticsEngine was provided");
1711
1712  SmallVector<StoredDiagnostic, 4> StoredDiagnostics;
1713
1714  std::shared_ptr<CompilerInvocation> CI;
1715
1716  {
1717    CaptureDroppedDiagnostics Capture(CaptureDiagnostics, *Diags,
1718                                      &StoredDiagnostics, nullptr);
1719
1720    CI = createInvocationFromCommandLine(
1721        llvm::makeArrayRef(ArgBegin, ArgEnd), Diags, VFS);
1722    if (!CI)
1723      return nullptr;
1724  }
1725
1726  // Override any files that need remapping
1727  for (const auto &RemappedFile : RemappedFiles) {
1728    CI->getPreprocessorOpts().addRemappedFile(RemappedFile.first,
1729                                              RemappedFile.second);
1730  }
1731  PreprocessorOptions &PPOpts = CI->getPreprocessorOpts();
1732  PPOpts.RemappedFilesKeepOriginalName = RemappedFilesKeepOriginalName;
1733  PPOpts.AllowPCHWithCompilerErrors = AllowPCHWithCompilerErrors;
1734  PPOpts.SingleFileParseMode = SingleFileParse;
1735
1736  // Override the resources path.
1737  CI->getHeaderSearchOpts().ResourceDir = ResourceFilesPath;
1738
1739  CI->getFrontendOpts().SkipFunctionBodies =
1740      SkipFunctionBodies == SkipFunctionBodiesScope::PreambleAndMainFile;
1741
1742  if (ModuleFormat)
1743    CI->getHeaderSearchOpts().ModuleFormat = ModuleFormat.getValue();
1744
1745  // Create the AST unit.
1746  std::unique_ptr<ASTUnit> AST;
1747  AST.reset(new ASTUnit(false));
1748  AST->NumStoredDiagnosticsFromDriver = StoredDiagnostics.size();
1749  AST->StoredDiagnostics.swap(StoredDiagnostics);
1750  ConfigureDiags(Diags, *AST, CaptureDiagnostics);
1751  AST->Diagnostics = Diags;
1752  AST->FileSystemOpts = CI->getFileSystemOpts();
1753  if (!VFS)
1754    VFS = llvm::vfs::getRealFileSystem();
1755  VFS = createVFSFromCompilerInvocation(*CI, *Diags, VFS);
1756  AST->FileMgr = new FileManager(AST->FileSystemOpts, VFS);
1757  AST->ModuleCache = new InMemoryModuleCache;
1758  AST->OnlyLocalDecls = OnlyLocalDecls;
1759  AST->CaptureDiagnostics = CaptureDiagnostics;
1760  AST->TUKind = TUKind;
1761  AST->ShouldCacheCodeCompletionResults = CacheCodeCompletionResults;
1762  AST->IncludeBriefCommentsInCodeCompletion
1763    = IncludeBriefCommentsInCodeCompletion;
1764  AST->UserFilesAreVolatile = UserFilesAreVolatile;
1765  AST->Invocation = CI;
1766  AST->SkipFunctionBodies = SkipFunctionBodies;
1767  if (ForSerialization)
1768    AST->WriterData.reset(new ASTWriterData(*AST->ModuleCache));
1769  // Zero out now to ease cleanup during crash recovery.
1770  CI = nullptr;
1771  Diags = nullptr;
1772
1773  // Recover resources if we crash before exiting this method.
1774  llvm::CrashRecoveryContextCleanupRegistrar<ASTUnit>
1775    ASTUnitCleanup(AST.get());
1776
1777  if (AST->LoadFromCompilerInvocation(std::move(PCHContainerOps),
1778                                      PrecompilePreambleAfterNParses,
1779                                      VFS)) {
1780    // Some error occurred, if caller wants to examine diagnostics, pass it the
1781    // ASTUnit.
1782    if (ErrAST) {
1783      AST->StoredDiagnostics.swap(AST->FailedParseDiagnostics);
1784      ErrAST->swap(AST);
1785    }
1786    return nullptr;
1787  }
1788
1789  return AST.release();
1790}
1791
1792bool ASTUnit::Reparse(std::shared_ptr<PCHContainerOperations> PCHContainerOps,
1793                      ArrayRef<RemappedFile> RemappedFiles,
1794                      IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS) {
1795  if (!Invocation)
1796    return true;
1797
1798  if (!VFS) {
1799     (0) . __assert_fail ("FileMgr && \"FileMgr is null on Reparse call\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 1799, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(FileMgr && "FileMgr is null on Reparse call");
1800    VFS = &FileMgr->getVirtualFileSystem();
1801  }
1802
1803  clearFileLevelDecls();
1804
1805  SimpleTimer ParsingTimer(WantTiming);
1806  ParsingTimer.setOutput("Reparsing " + getMainFileName());
1807
1808  // Remap files.
1809  PreprocessorOptions &PPOpts = Invocation->getPreprocessorOpts();
1810  for (const auto &RB : PPOpts.RemappedFileBuffers)
1811    delete RB.second;
1812
1813  Invocation->getPreprocessorOpts().clearRemappedFiles();
1814  for (const auto &RemappedFile : RemappedFiles) {
1815    Invocation->getPreprocessorOpts().addRemappedFile(RemappedFile.first,
1816                                                      RemappedFile.second);
1817  }
1818
1819  // If we have a preamble file lying around, or if we might try to
1820  // build a precompiled preamble, do so now.
1821  std::unique_ptr<llvm::MemoryBuffer> OverrideMainBuffer;
1822  if (Preamble || PreambleRebuildCounter > 0)
1823    OverrideMainBuffer =
1824        getMainBufferWithPrecompiledPreamble(PCHContainerOps, *Invocation, VFS);
1825
1826  // Clear out the diagnostics state.
1827  FileMgr.reset();
1828  getDiagnostics().Reset();
1829  ProcessWarningOptions(getDiagnostics(), Invocation->getDiagnosticOpts());
1830  if (OverrideMainBuffer)
1831    getDiagnostics().setNumWarnings(NumWarningsInPreamble);
1832
1833  // Parse the sources
1834  bool Result =
1835      Parse(std::move(PCHContainerOps), std::move(OverrideMainBuffer), VFS);
1836
1837  // If we're caching global code-completion results, and the top-level
1838  // declarations have changed, clear out the code-completion cache.
1839  if (!Result && ShouldCacheCodeCompletionResults &&
1840      CurrentTopLevelHashValue != CompletionCacheTopLevelHashValue)
1841    CacheCodeCompletionResults();
1842
1843  // We now need to clear out the completion info related to this translation
1844  // unit; it'll be recreated if necessary.
1845  CCTUInfo.reset();
1846
1847  return Result;
1848}
1849
1850void ASTUnit::ResetForParse() {
1851  SavedMainFileBuffer.reset();
1852
1853  SourceMgr.reset();
1854  TheSema.reset();
1855  Ctx.reset();
1856  PP.reset();
1857  Reader.reset();
1858
1859  TopLevelDecls.clear();
1860  clearFileLevelDecls();
1861}
1862
1863//----------------------------------------------------------------------------//
1864// Code completion
1865//----------------------------------------------------------------------------//
1866
1867namespace {
1868
1869  /// Code completion consumer that combines the cached code-completion
1870  /// results from an ASTUnit with the code-completion results provided to it,
1871  /// then passes the result on to
1872  class AugmentedCodeCompleteConsumer : public CodeCompleteConsumer {
1873    uint64_t NormalContexts;
1874    ASTUnit &AST;
1875    CodeCompleteConsumer &Next;
1876
1877  public:
1878    AugmentedCodeCompleteConsumer(ASTUnit &AST, CodeCompleteConsumer &Next,
1879                                  const CodeCompleteOptions &CodeCompleteOpts)
1880        : CodeCompleteConsumer(CodeCompleteOpts, Next.isOutputBinary()),
1881          AST(AST), Next(Next) {
1882      // Compute the set of contexts in which we will look when we don't have
1883      // any information about the specific context.
1884      NormalContexts
1885        = (1LL << CodeCompletionContext::CCC_TopLevel)
1886        | (1LL << CodeCompletionContext::CCC_ObjCInterface)
1887        | (1LL << CodeCompletionContext::CCC_ObjCImplementation)
1888        | (1LL << CodeCompletionContext::CCC_ObjCIvarList)
1889        | (1LL << CodeCompletionContext::CCC_Statement)
1890        | (1LL << CodeCompletionContext::CCC_Expression)
1891        | (1LL << CodeCompletionContext::CCC_ObjCMessageReceiver)
1892        | (1LL << CodeCompletionContext::CCC_DotMemberAccess)
1893        | (1LL << CodeCompletionContext::CCC_ArrowMemberAccess)
1894        | (1LL << CodeCompletionContext::CCC_ObjCPropertyAccess)
1895        | (1LL << CodeCompletionContext::CCC_ObjCProtocolName)
1896        | (1LL << CodeCompletionContext::CCC_ParenthesizedExpression)
1897        | (1LL << CodeCompletionContext::CCC_Recovery);
1898
1899      if (AST.getASTContext().getLangOpts().CPlusPlus)
1900        NormalContexts |= (1LL << CodeCompletionContext::CCC_EnumTag)
1901                       |  (1LL << CodeCompletionContext::CCC_UnionTag)
1902                       |  (1LL << CodeCompletionContext::CCC_ClassOrStructTag);
1903    }
1904
1905    void ProcessCodeCompleteResults(Sema &S, CodeCompletionContext Context,
1906                                    CodeCompletionResult *Results,
1907                                    unsigned NumResults) override;
1908
1909    void ProcessOverloadCandidates(Sema &S, unsigned CurrentArg,
1910                                   OverloadCandidate *Candidates,
1911                                   unsigned NumCandidates,
1912                                   SourceLocation OpenParLoc) override {
1913      Next.ProcessOverloadCandidates(S, CurrentArg, Candidates, NumCandidates,
1914                                     OpenParLoc);
1915    }
1916
1917    CodeCompletionAllocator &getAllocator() override {
1918      return Next.getAllocator();
1919    }
1920
1921    CodeCompletionTUInfo &getCodeCompletionTUInfo() override {
1922      return Next.getCodeCompletionTUInfo();
1923    }
1924  };
1925
1926} // namespace
1927
1928/// Helper function that computes which global names are hidden by the
1929/// local code-completion results.
1930static void CalculateHiddenNames(const CodeCompletionContext &Context,
1931                                 CodeCompletionResult *Results,
1932                                 unsigned NumResults,
1933                                 ASTContext &Ctx,
1934                          llvm::StringSet<llvm::BumpPtrAllocator> &HiddenNames){
1935  bool OnlyTagNames = false;
1936  switch (Context.getKind()) {
1937  case CodeCompletionContext::CCC_Recovery:
1938  case CodeCompletionContext::CCC_TopLevel:
1939  case CodeCompletionContext::CCC_ObjCInterface:
1940  case CodeCompletionContext::CCC_ObjCImplementation:
1941  case CodeCompletionContext::CCC_ObjCIvarList:
1942  case CodeCompletionContext::CCC_ClassStructUnion:
1943  case CodeCompletionContext::CCC_Statement:
1944  case CodeCompletionContext::CCC_Expression:
1945  case CodeCompletionContext::CCC_ObjCMessageReceiver:
1946  case CodeCompletionContext::CCC_DotMemberAccess:
1947  case CodeCompletionContext::CCC_ArrowMemberAccess:
1948  case CodeCompletionContext::CCC_ObjCPropertyAccess:
1949  case CodeCompletionContext::CCC_Namespace:
1950  case CodeCompletionContext::CCC_Type:
1951  case CodeCompletionContext::CCC_Symbol:
1952  case CodeCompletionContext::CCC_SymbolOrNewName:
1953  case CodeCompletionContext::CCC_ParenthesizedExpression:
1954  case CodeCompletionContext::CCC_ObjCInterfaceName:
1955    break;
1956
1957  case CodeCompletionContext::CCC_EnumTag:
1958  case CodeCompletionContext::CCC_UnionTag:
1959  case CodeCompletionContext::CCC_ClassOrStructTag:
1960    OnlyTagNames = true;
1961    break;
1962
1963  case CodeCompletionContext::CCC_ObjCProtocolName:
1964  case CodeCompletionContext::CCC_MacroName:
1965  case CodeCompletionContext::CCC_MacroNameUse:
1966  case CodeCompletionContext::CCC_PreprocessorExpression:
1967  case CodeCompletionContext::CCC_PreprocessorDirective:
1968  case CodeCompletionContext::CCC_NaturalLanguage:
1969  case CodeCompletionContext::CCC_SelectorName:
1970  case CodeCompletionContext::CCC_TypeQualifiers:
1971  case CodeCompletionContext::CCC_Other:
1972  case CodeCompletionContext::CCC_OtherWithMacros:
1973  case CodeCompletionContext::CCC_ObjCInstanceMessage:
1974  case CodeCompletionContext::CCC_ObjCClassMessage:
1975  case CodeCompletionContext::CCC_ObjCCategoryName:
1976  case CodeCompletionContext::CCC_IncludedFile:
1977  case CodeCompletionContext::CCC_NewName:
1978    // We're looking for nothing, or we're looking for names that cannot
1979    // be hidden.
1980    return;
1981  }
1982
1983  using Result = CodeCompletionResult;
1984  for (unsigned I = 0; I != NumResults; ++I) {
1985    if (Results[I].Kind != Result::RK_Declaration)
1986      continue;
1987
1988    unsigned IDNS
1989      = Results[I].Declaration->getUnderlyingDecl()->getIdentifierNamespace();
1990
1991    bool Hiding = false;
1992    if (OnlyTagNames)
1993      Hiding = (IDNS & Decl::IDNS_Tag);
1994    else {
1995      unsigned HiddenIDNS = (Decl::IDNS_Type | Decl::IDNS_Member |
1996                             Decl::IDNS_Namespace | Decl::IDNS_Ordinary |
1997                             Decl::IDNS_NonMemberOperator);
1998      if (Ctx.getLangOpts().CPlusPlus)
1999        HiddenIDNS |= Decl::IDNS_Tag;
2000      Hiding = (IDNS & HiddenIDNS);
2001    }
2002
2003    if (!Hiding)
2004      continue;
2005
2006    DeclarationName Name = Results[I].Declaration->getDeclName();
2007    if (IdentifierInfo *Identifier = Name.getAsIdentifierInfo())
2008      HiddenNames.insert(Identifier->getName());
2009    else
2010      HiddenNames.insert(Name.getAsString());
2011  }
2012}
2013
2014void AugmentedCodeCompleteConsumer::ProcessCodeCompleteResults(Sema &S,
2015                                            CodeCompletionContext Context,
2016                                            CodeCompletionResult *Results,
2017                                            unsigned NumResults) {
2018  // Merge the results we were given with the results we cached.
2019  bool AddedResult = false;
2020  uint64_t InContexts =
2021      Context.getKind() == CodeCompletionContext::CCC_Recovery
2022        ? NormalContexts : (1LL << Context.getKind());
2023  // Contains the set of names that are hidden by "local" completion results.
2024  llvm::StringSet<llvm::BumpPtrAllocator> HiddenNames;
2025  using Result = CodeCompletionResult;
2026  SmallVector<Result, 8> AllResults;
2027  for (ASTUnit::cached_completion_iterator
2028            C = AST.cached_completion_begin(),
2029         CEnd = AST.cached_completion_end();
2030       C != CEnd; ++C) {
2031    // If the context we are in matches any of the contexts we are
2032    // interested in, we'll add this result.
2033    if ((C->ShowInContexts & InContexts) == 0)
2034      continue;
2035
2036    // If we haven't added any results previously, do so now.
2037    if (!AddedResult) {
2038      CalculateHiddenNames(Context, Results, NumResults, S.Context,
2039                           HiddenNames);
2040      AllResults.insert(AllResults.end(), Results, Results + NumResults);
2041      AddedResult = true;
2042    }
2043
2044    // Determine whether this global completion result is hidden by a local
2045    // completion result. If so, skip it.
2046    if (C->Kind != CXCursor_MacroDefinition &&
2047        HiddenNames.count(C->Completion->getTypedText()))
2048      continue;
2049
2050    // Adjust priority based on similar type classes.
2051    unsigned Priority = C->Priority;
2052    CodeCompletionString *Completion = C->Completion;
2053    if (!Context.getPreferredType().isNull()) {
2054      if (C->Kind == CXCursor_MacroDefinition) {
2055        Priority = getMacroUsagePriority(C->Completion->getTypedText(),
2056                                         S.getLangOpts(),
2057                               Context.getPreferredType()->isAnyPointerType());
2058      } else if (C->Type) {
2059        CanQualType Expected
2060          = S.Context.getCanonicalType(
2061                               Context.getPreferredType().getUnqualifiedType());
2062        SimplifiedTypeClass ExpectedSTC = getSimplifiedTypeClass(Expected);
2063        if (ExpectedSTC == C->TypeClass) {
2064          // We know this type is similar; check for an exact match.
2065          llvm::StringMap<unsigned> &CachedCompletionTypes
2066            = AST.getCachedCompletionTypes();
2067          llvm::StringMap<unsigned>::iterator Pos
2068            = CachedCompletionTypes.find(QualType(Expected).getAsString());
2069          if (Pos != CachedCompletionTypes.end() && Pos->second == C->Type)
2070            Priority /= CCF_ExactTypeMatch;
2071          else
2072            Priority /= CCF_SimilarTypeMatch;
2073        }
2074      }
2075    }
2076
2077    // Adjust the completion string, if required.
2078    if (C->Kind == CXCursor_MacroDefinition &&
2079        Context.getKind() == CodeCompletionContext::CCC_MacroNameUse) {
2080      // Create a new code-completion string that just contains the
2081      // macro name, without its arguments.
2082      CodeCompletionBuilder Builder(getAllocator(), getCodeCompletionTUInfo(),
2083                                    CCP_CodePattern, C->Availability);
2084      Builder.AddTypedTextChunk(C->Completion->getTypedText());
2085      Priority = CCP_CodePattern;
2086      Completion = Builder.TakeString();
2087    }
2088
2089    AllResults.push_back(Result(Completion, Priority, C->Kind,
2090                                C->Availability));
2091  }
2092
2093  // If we did not add any cached completion results, just forward the
2094  // results we were given to the next consumer.
2095  if (!AddedResult) {
2096    Next.ProcessCodeCompleteResults(S, Context, Results, NumResults);
2097    return;
2098  }
2099
2100  Next.ProcessCodeCompleteResults(S, Context, AllResults.data(),
2101                                  AllResults.size());
2102}
2103
2104void ASTUnit::CodeComplete(
2105    StringRef File, unsigned Line, unsigned Column,
2106    ArrayRef<RemappedFile> RemappedFiles, bool IncludeMacros,
2107    bool IncludeCodePatterns, bool IncludeBriefComments,
2108    CodeCompleteConsumer &Consumer,
2109    std::shared_ptr<PCHContainerOperations> PCHContainerOps,
2110    DiagnosticsEngine &Diag, LangOptions &LangOpts, SourceManager &SourceMgr,
2111    FileManager &FileMgr, SmallVectorImpl<StoredDiagnostic> &StoredDiagnostics,
2112    SmallVectorImpl<const llvm::MemoryBuffer *> &OwnedBuffers) {
2113  if (!Invocation)
2114    return;
2115
2116  SimpleTimer CompletionTimer(WantTiming);
2117  CompletionTimer.setOutput("Code completion @ " + File + ":" +
2118                            Twine(Line) + ":" + Twine(Column));
2119
2120  auto CCInvocation = std::make_shared<CompilerInvocation>(*Invocation);
2121
2122  FrontendOptions &FrontendOpts = CCInvocation->getFrontendOpts();
2123  CodeCompleteOptions &CodeCompleteOpts = FrontendOpts.CodeCompleteOpts;
2124  PreprocessorOptions &PreprocessorOpts = CCInvocation->getPreprocessorOpts();
2125
2126  CodeCompleteOpts.IncludeMacros = IncludeMacros &&
2127                                   CachedCompletionResults.empty();
2128  CodeCompleteOpts.IncludeCodePatterns = IncludeCodePatterns;
2129  CodeCompleteOpts.IncludeGlobals = CachedCompletionResults.empty();
2130  CodeCompleteOpts.IncludeBriefComments = IncludeBriefComments;
2131  CodeCompleteOpts.LoadExternal = Consumer.loadExternal();
2132  CodeCompleteOpts.IncludeFixIts = Consumer.includeFixIts();
2133
2134  IncludeBriefCommentsInCodeCompletion", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 2134, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(IncludeBriefComments == this->IncludeBriefCommentsInCodeCompletion);
2135
2136  FrontendOpts.CodeCompletionAt.FileName = File;
2137  FrontendOpts.CodeCompletionAt.Line = Line;
2138  FrontendOpts.CodeCompletionAt.Column = Column;
2139
2140  // Set the language options appropriately.
2141  LangOpts = *CCInvocation->getLangOpts();
2142
2143  // Spell-checking and warnings are wasteful during code-completion.
2144  LangOpts.SpellChecking = false;
2145  CCInvocation->getDiagnosticOpts().IgnoreWarnings = true;
2146
2147  std::unique_ptr<CompilerInstance> Clang(
2148      new CompilerInstance(PCHContainerOps));
2149
2150  // Recover resources if we crash before exiting this method.
2151  llvm::CrashRecoveryContextCleanupRegistrar<CompilerInstance>
2152    CICleanup(Clang.get());
2153
2154  auto &Inv = *CCInvocation;
2155  Clang->setInvocation(std::move(CCInvocation));
2156  OriginalSourceFile = Clang->getFrontendOpts().Inputs[0].getFile();
2157
2158  // Set up diagnostics, capturing any diagnostics produced.
2159  Clang->setDiagnostics(&Diag);
2160  CaptureDroppedDiagnostics Capture(true,
2161                                    Clang->getDiagnostics(),
2162                                    &StoredDiagnostics, nullptr);
2163  ProcessWarningOptions(Diag, Inv.getDiagnosticOpts());
2164
2165  // Create the target instance.
2166  Clang->setTarget(TargetInfo::CreateTargetInfo(
2167      Clang->getDiagnostics(), Clang->getInvocation().TargetOpts));
2168  if (!Clang->hasTarget()) {
2169    Clang->setInvocation(nullptr);
2170    return;
2171  }
2172
2173  // Inform the target of the language options.
2174  //
2175  // FIXME: We shouldn't need to do this, the target should be immutable once
2176  // created. This complexity should be lifted elsewhere.
2177  Clang->getTarget().adjust(Clang->getLangOpts());
2178
2179   (0) . __assert_fail ("Clang->getFrontendOpts().Inputs.size() == 1 && \"Invocation must have exactly one source file!\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 2180, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(Clang->getFrontendOpts().Inputs.size() == 1 &&
2180 (0) . __assert_fail ("Clang->getFrontendOpts().Inputs.size() == 1 && \"Invocation must have exactly one source file!\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 2180, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">         "Invocation must have exactly one source file!");
2181   (0) . __assert_fail ("Clang->getFrontendOpts().Inputs[0].getKind().getFormat() == InputKind..Source && \"FIXME. AST inputs not yet supported here!\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 2183, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(Clang->getFrontendOpts().Inputs[0].getKind().getFormat() ==
2182 (0) . __assert_fail ("Clang->getFrontendOpts().Inputs[0].getKind().getFormat() == InputKind..Source && \"FIXME. AST inputs not yet supported here!\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 2183, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">             InputKind::Source &&
2183 (0) . __assert_fail ("Clang->getFrontendOpts().Inputs[0].getKind().getFormat() == InputKind..Source && \"FIXME. AST inputs not yet supported here!\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 2183, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">         "FIXME: AST inputs not yet supported here!");
2184   (0) . __assert_fail ("Clang->getFrontendOpts().Inputs[0].getKind().getLanguage() != InputKind..LLVM_IR && \"IR inputs not support here!\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 2186, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(Clang->getFrontendOpts().Inputs[0].getKind().getLanguage() !=
2185 (0) . __assert_fail ("Clang->getFrontendOpts().Inputs[0].getKind().getLanguage() != InputKind..LLVM_IR && \"IR inputs not support here!\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 2186, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">             InputKind::LLVM_IR &&
2186 (0) . __assert_fail ("Clang->getFrontendOpts().Inputs[0].getKind().getLanguage() != InputKind..LLVM_IR && \"IR inputs not support here!\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 2186, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">         "IR inputs not support here!");
2187
2188  // Use the source and file managers that we were given.
2189  Clang->setFileManager(&FileMgr);
2190  Clang->setSourceManager(&SourceMgr);
2191
2192  // Remap files.
2193  PreprocessorOpts.clearRemappedFiles();
2194  PreprocessorOpts.RetainRemappedFileBuffers = true;
2195  for (const auto &RemappedFile : RemappedFiles) {
2196    PreprocessorOpts.addRemappedFile(RemappedFile.first, RemappedFile.second);
2197    OwnedBuffers.push_back(RemappedFile.second);
2198  }
2199
2200  // Use the code completion consumer we were given, but adding any cached
2201  // code-completion results.
2202  AugmentedCodeCompleteConsumer *AugmentedConsumer
2203    = new AugmentedCodeCompleteConsumer(*this, Consumer, CodeCompleteOpts);
2204  Clang->setCodeCompletionConsumer(AugmentedConsumer);
2205
2206  // If we have a precompiled preamble, try to use it. We only allow
2207  // the use of the precompiled preamble if we're if the completion
2208  // point is within the main file, after the end of the precompiled
2209  // preamble.
2210  std::unique_ptr<llvm::MemoryBuffer> OverrideMainBuffer;
2211  if (Preamble) {
2212    std::string CompleteFilePath(File);
2213
2214    auto &VFS = FileMgr.getVirtualFileSystem();
2215    auto CompleteFileStatus = VFS.status(CompleteFilePath);
2216    if (CompleteFileStatus) {
2217      llvm::sys::fs::UniqueID CompleteFileID = CompleteFileStatus->getUniqueID();
2218
2219      std::string MainPath(OriginalSourceFile);
2220      auto MainStatus = VFS.status(MainPath);
2221      if (MainStatus) {
2222        llvm::sys::fs::UniqueID MainID = MainStatus->getUniqueID();
2223        if (CompleteFileID == MainID && Line > 1)
2224          OverrideMainBuffer = getMainBufferWithPrecompiledPreamble(
2225              PCHContainerOps, Inv, &VFS, false, Line - 1);
2226      }
2227    }
2228  }
2229
2230  // If the main file has been overridden due to the use of a preamble,
2231  // make that override happen and introduce the preamble.
2232  if (OverrideMainBuffer) {
2233     (0) . __assert_fail ("Preamble && \"No preamble was built, but OverrideMainBuffer is not null\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 2234, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(Preamble &&
2234 (0) . __assert_fail ("Preamble && \"No preamble was built, but OverrideMainBuffer is not null\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 2234, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">           "No preamble was built, but OverrideMainBuffer is not null");
2235
2236    IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS =
2237        &FileMgr.getVirtualFileSystem();
2238    Preamble->AddImplicitPreamble(Clang->getInvocation(), VFS,
2239                                  OverrideMainBuffer.get());
2240    // FIXME: there is no way to update VFS if it was changed by
2241    // AddImplicitPreamble as FileMgr is accepted as a parameter by this method.
2242    // We use on-disk preambles instead and rely on FileMgr's VFS to ensure the
2243    // PCH files are always readable.
2244    OwnedBuffers.push_back(OverrideMainBuffer.release());
2245  } else {
2246    PreprocessorOpts.PrecompiledPreambleBytes.first = 0;
2247    PreprocessorOpts.PrecompiledPreambleBytes.second = false;
2248  }
2249
2250  // Disable the preprocessing record if modules are not enabled.
2251  if (!Clang->getLangOpts().Modules)
2252    PreprocessorOpts.DetailedRecord = false;
2253
2254  std::unique_ptr<SyntaxOnlyAction> Act;
2255  Act.reset(new SyntaxOnlyAction);
2256  if (Act->BeginSourceFile(*Clang.get(), Clang->getFrontendOpts().Inputs[0])) {
2257    Act->Execute();
2258    Act->EndSourceFile();
2259  }
2260}
2261
2262bool ASTUnit::Save(StringRef File) {
2263  if (HadModuleLoaderFatalFailure)
2264    return true;
2265
2266  // Write to a temporary file and later rename it to the actual file, to avoid
2267  // possible race conditions.
2268  SmallString<128> TempPath;
2269  TempPath = File;
2270  TempPath += "-%%%%%%%%";
2271  int fd;
2272  if (llvm::sys::fs::createUniqueFile(TempPath, fd, TempPath))
2273    return true;
2274
2275  // FIXME: Can we somehow regenerate the stat cache here, or do we need to
2276  // unconditionally create a stat cache when we parse the file?
2277  llvm::raw_fd_ostream Out(fd, /*shouldClose=*/true);
2278
2279  serialize(Out);
2280  Out.close();
2281  if (Out.has_error()) {
2282    Out.clear_error();
2283    return true;
2284  }
2285
2286  if (llvm::sys::fs::rename(TempPath, File)) {
2287    llvm::sys::fs::remove(TempPath);
2288    return true;
2289  }
2290
2291  return false;
2292}
2293
2294static bool serializeUnit(ASTWriter &Writer,
2295                          SmallVectorImpl<char> &Buffer,
2296                          Sema &S,
2297                          bool hasErrors,
2298                          raw_ostream &OS) {
2299  Writer.WriteAST(S, std::string(), nullptr, "", hasErrors);
2300
2301  // Write the generated bitstream to "Out".
2302  if (!Buffer.empty())
2303    OS.write(Buffer.data(), Buffer.size());
2304
2305  return false;
2306}
2307
2308bool ASTUnit::serialize(raw_ostream &OS) {
2309  // For serialization we are lenient if the errors were only warn-as-error kind.
2310  bool hasErrors = getDiagnostics().hasUncompilableErrorOccurred();
2311
2312  if (WriterData)
2313    return serializeUnit(WriterData->Writer, WriterData->Buffer,
2314                         getSema(), hasErrors, OS);
2315
2316  SmallString<128> Buffer;
2317  llvm::BitstreamWriter Stream(Buffer);
2318  InMemoryModuleCache ModuleCache;
2319  ASTWriter Writer(Stream, Buffer, ModuleCache, {});
2320  return serializeUnit(Writer, Buffer, getSema(), hasErrors, OS);
2321}
2322
2323using SLocRemap = ContinuousRangeMap<unsigned, int, 2>;
2324
2325void ASTUnit::TranslateStoredDiagnostics(
2326                          FileManager &FileMgr,
2327                          SourceManager &SrcMgr,
2328                          const SmallVectorImpl<StandaloneDiagnostic> &Diags,
2329                          SmallVectorImpl<StoredDiagnostic> &Out) {
2330  // Map the standalone diagnostic into the new source manager. We also need to
2331  // remap all the locations to the new view. This includes the diag location,
2332  // any associated source ranges, and the source ranges of associated fix-its.
2333  // FIXME: There should be a cleaner way to do this.
2334  SmallVector<StoredDiagnostic, 4> Result;
2335  Result.reserve(Diags.size());
2336
2337  for (const auto &SD : Diags) {
2338    // Rebuild the StoredDiagnostic.
2339    if (SD.Filename.empty())
2340      continue;
2341    const FileEntry *FE = FileMgr.getFile(SD.Filename);
2342    if (!FE)
2343      continue;
2344    SourceLocation FileLoc;
2345    auto ItFileID = PreambleSrcLocCache.find(SD.Filename);
2346    if (ItFileID == PreambleSrcLocCache.end()) {
2347      FileID FID = SrcMgr.translateFile(FE);
2348      FileLoc = SrcMgr.getLocForStartOfFile(FID);
2349      PreambleSrcLocCache[SD.Filename] = FileLoc;
2350    } else {
2351      FileLoc = ItFileID->getValue();
2352    }
2353
2354    if (FileLoc.isInvalid())
2355      continue;
2356    SourceLocation L = FileLoc.getLocWithOffset(SD.LocOffset);
2357    FullSourceLoc Loc(L, SrcMgr);
2358
2359    SmallVector<CharSourceRange, 4> Ranges;
2360    Ranges.reserve(SD.Ranges.size());
2361    for (const auto &Range : SD.Ranges) {
2362      SourceLocation BL = FileLoc.getLocWithOffset(Range.first);
2363      SourceLocation EL = FileLoc.getLocWithOffset(Range.second);
2364      Ranges.push_back(CharSourceRange::getCharRange(BL, EL));
2365    }
2366
2367    SmallVector<FixItHint, 2> FixIts;
2368    FixIts.reserve(SD.FixIts.size());
2369    for (const auto &FixIt : SD.FixIts) {
2370      FixIts.push_back(FixItHint());
2371      FixItHint &FH = FixIts.back();
2372      FH.CodeToInsert = FixIt.CodeToInsert;
2373      SourceLocation BL = FileLoc.getLocWithOffset(FixIt.RemoveRange.first);
2374      SourceLocation EL = FileLoc.getLocWithOffset(FixIt.RemoveRange.second);
2375      FH.RemoveRange = CharSourceRange::getCharRange(BL, EL);
2376    }
2377
2378    Result.push_back(StoredDiagnostic(SD.Level, SD.ID,
2379                                      SD.Message, Loc, Ranges, FixIts));
2380  }
2381  Result.swap(Out);
2382}
2383
2384void ASTUnit::addFileLevelDecl(Decl *D) {
2385  assert(D);
2386
2387  // We only care about local declarations.
2388  if (D->isFromASTFile())
2389    return;
2390
2391  SourceManager &SM = *SourceMgr;
2392  SourceLocation Loc = D->getLocation();
2393  if (Loc.isInvalid() || !SM.isLocalSourceLocation(Loc))
2394    return;
2395
2396  // We only keep track of the file-level declarations of each file.
2397  if (!D->getLexicalDeclContext()->isFileContext())
2398    return;
2399
2400  SourceLocation FileLoc = SM.getFileLoc(Loc);
2401  assert(SM.isLocalSourceLocation(FileLoc));
2402  FileID FID;
2403  unsigned Offset;
2404  std::tie(FID, Offset) = SM.getDecomposedLoc(FileLoc);
2405  if (FID.isInvalid())
2406    return;
2407
2408  LocDeclsTy *&Decls = FileDecls[FID];
2409  if (!Decls)
2410    Decls = new LocDeclsTy();
2411
2412  std::pair<unsigned, Decl *> LocDecl(Offset, D);
2413
2414  if (Decls->empty() || Decls->back().first <= Offset) {
2415    Decls->push_back(LocDecl);
2416    return;
2417  }
2418
2419  LocDeclsTy::iterator I = std::upper_bound(Decls->begin(), Decls->end(),
2420                                            LocDecl, llvm::less_first());
2421
2422  Decls->insert(I, LocDecl);
2423}
2424
2425void ASTUnit::findFileRegionDecls(FileID File, unsigned Offset, unsigned Length,
2426                                  SmallVectorImpl<Decl *> &Decls) {
2427  if (File.isInvalid())
2428    return;
2429
2430  if (SourceMgr->isLoadedFileID(File)) {
2431     (0) . __assert_fail ("Ctx->getExternalSource() && \"No external source!\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 2431, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(Ctx->getExternalSource() && "No external source!");
2432    return Ctx->getExternalSource()->FindFileRegionDecls(File, Offset, Length,
2433                                                         Decls);
2434  }
2435
2436  FileDeclsTy::iterator I = FileDecls.find(File);
2437  if (I == FileDecls.end())
2438    return;
2439
2440  LocDeclsTy &LocDecls = *I->second;
2441  if (LocDecls.empty())
2442    return;
2443
2444  LocDeclsTy::iterator BeginIt =
2445      std::lower_bound(LocDecls.begin(), LocDecls.end(),
2446                       std::make_pair(Offset, (Decl *)nullptr),
2447                       llvm::less_first());
2448  if (BeginIt != LocDecls.begin())
2449    --BeginIt;
2450
2451  // If we are pointing at a top-level decl inside an objc container, we need
2452  // to backtrack until we find it otherwise we will fail to report that the
2453  // region overlaps with an objc container.
2454  while (BeginIt != LocDecls.begin() &&
2455         BeginIt->second->isTopLevelDeclInObjCContainer())
2456    --BeginIt;
2457
2458  LocDeclsTy::iterator EndIt = std::upper_bound(
2459      LocDecls.begin(), LocDecls.end(),
2460      std::make_pair(Offset + Length, (Decl *)nullptr), llvm::less_first());
2461  if (EndIt != LocDecls.end())
2462    ++EndIt;
2463
2464  for (LocDeclsTy::iterator DIt = BeginIt; DIt != EndIt; ++DIt)
2465    Decls.push_back(DIt->second);
2466}
2467
2468SourceLocation ASTUnit::getLocation(const FileEntry *File,
2469                                    unsigned Line, unsigned Col) const {
2470  const SourceManager &SM = getSourceManager();
2471  SourceLocation Loc = SM.translateFileLineCol(File, Line, Col);
2472  return SM.getMacroArgExpandedLocation(Loc);
2473}
2474
2475SourceLocation ASTUnit::getLocation(const FileEntry *File,
2476                                    unsigned Offset) const {
2477  const SourceManager &SM = getSourceManager();
2478  SourceLocation FileLoc = SM.translateFileLineCol(File, 1, 1);
2479  return SM.getMacroArgExpandedLocation(FileLoc.getLocWithOffset(Offset));
2480}
2481
2482/// If \arg Loc is a loaded location from the preamble, returns
2483/// the corresponding local location of the main file, otherwise it returns
2484/// \arg Loc.
2485SourceLocation ASTUnit::mapLocationFromPreamble(SourceLocation Loc) const {
2486  FileID PreambleID;
2487  if (SourceMgr)
2488    PreambleID = SourceMgr->getPreambleFileID();
2489
2490  if (Loc.isInvalid() || !Preamble || PreambleID.isInvalid())
2491    return Loc;
2492
2493  unsigned Offs;
2494  if (SourceMgr->isInFileID(Loc, PreambleID, &Offs) && Offs < Preamble->getBounds().Size) {
2495    SourceLocation FileLoc
2496        = SourceMgr->getLocForStartOfFile(SourceMgr->getMainFileID());
2497    return FileLoc.getLocWithOffset(Offs);
2498  }
2499
2500  return Loc;
2501}
2502
2503/// If \arg Loc is a local location of the main file but inside the
2504/// preamble chunk, returns the corresponding loaded location from the
2505/// preamble, otherwise it returns \arg Loc.
2506SourceLocation ASTUnit::mapLocationToPreamble(SourceLocation Loc) const {
2507  FileID PreambleID;
2508  if (SourceMgr)
2509    PreambleID = SourceMgr->getPreambleFileID();
2510
2511  if (Loc.isInvalid() || !Preamble || PreambleID.isInvalid())
2512    return Loc;
2513
2514  unsigned Offs;
2515  if (SourceMgr->isInFileID(Loc, SourceMgr->getMainFileID(), &Offs) &&
2516      Offs < Preamble->getBounds().Size) {
2517    SourceLocation FileLoc = SourceMgr->getLocForStartOfFile(PreambleID);
2518    return FileLoc.getLocWithOffset(Offs);
2519  }
2520
2521  return Loc;
2522}
2523
2524bool ASTUnit::isInPreambleFileID(SourceLocation Loc) const {
2525  FileID FID;
2526  if (SourceMgr)
2527    FID = SourceMgr->getPreambleFileID();
2528
2529  if (Loc.isInvalid() || FID.isInvalid())
2530    return false;
2531
2532  return SourceMgr->isInFileID(Loc, FID);
2533}
2534
2535bool ASTUnit::isInMainFileID(SourceLocation Loc) const {
2536  FileID FID;
2537  if (SourceMgr)
2538    FID = SourceMgr->getMainFileID();
2539
2540  if (Loc.isInvalid() || FID.isInvalid())
2541    return false;
2542
2543  return SourceMgr->isInFileID(Loc, FID);
2544}
2545
2546SourceLocation ASTUnit::getEndOfPreambleFileID() const {
2547  FileID FID;
2548  if (SourceMgr)
2549    FID = SourceMgr->getPreambleFileID();
2550
2551  if (FID.isInvalid())
2552    return {};
2553
2554  return SourceMgr->getLocForEndOfFile(FID);
2555}
2556
2557SourceLocation ASTUnit::getStartOfMainFileID() const {
2558  FileID FID;
2559  if (SourceMgr)
2560    FID = SourceMgr->getMainFileID();
2561
2562  if (FID.isInvalid())
2563    return {};
2564
2565  return SourceMgr->getLocForStartOfFile(FID);
2566}
2567
2568llvm::iterator_range<PreprocessingRecord::iterator>
2569ASTUnit::getLocalPreprocessingEntities() const {
2570  if (isMainFileAST()) {
2571    serialization::ModuleFile &
2572      Mod = Reader->getModuleManager().getPrimaryModule();
2573    return Reader->getModulePreprocessedEntities(Mod);
2574  }
2575
2576  if (PreprocessingRecord *PPRec = PP->getPreprocessingRecord())
2577    return llvm::make_range(PPRec->local_begin(), PPRec->local_end());
2578
2579  return llvm::make_range(PreprocessingRecord::iterator(),
2580                          PreprocessingRecord::iterator());
2581}
2582
2583bool ASTUnit::visitLocalTopLevelDecls(void *context, DeclVisitorFn Fn) {
2584  if (isMainFileAST()) {
2585    serialization::ModuleFile &
2586      Mod = Reader->getModuleManager().getPrimaryModule();
2587    for (const auto *D : Reader->getModuleFileLevelDecls(Mod)) {
2588      if (!Fn(context, D))
2589        return false;
2590    }
2591
2592    return true;
2593  }
2594
2595  for (ASTUnit::top_level_iterator TL = top_level_begin(),
2596                                TLEnd = top_level_end();
2597         TL != TLEnd; ++TL) {
2598    if (!Fn(context, *TL))
2599      return false;
2600  }
2601
2602  return true;
2603}
2604
2605const FileEntry *ASTUnit::getPCHFile() {
2606  if (!Reader)
2607    return nullptr;
2608
2609  serialization::ModuleFile *Mod = nullptr;
2610  Reader->getModuleManager().visit([&Mod](serialization::ModuleFile &M) {
2611    switch (M.Kind) {
2612    case serialization::MK_ImplicitModule:
2613    case serialization::MK_ExplicitModule:
2614    case serialization::MK_PrebuiltModule:
2615      return true; // skip dependencies.
2616    case serialization::MK_PCH:
2617      Mod = &M;
2618      return true; // found it.
2619    case serialization::MK_Preamble:
2620      return false; // look in dependencies.
2621    case serialization::MK_MainFile:
2622      return false; // look in dependencies.
2623    }
2624
2625    return true;
2626  });
2627  if (Mod)
2628    return Mod->File;
2629
2630  return nullptr;
2631}
2632
2633bool ASTUnit::isModuleFile() const {
2634  return isMainFileAST() && getLangOpts().isCompilingModule();
2635}
2636
2637InputKind ASTUnit::getInputKind() const {
2638  auto &LangOpts = getLangOpts();
2639
2640  InputKind::Language Lang;
2641  if (LangOpts.OpenCL)
2642    Lang = InputKind::OpenCL;
2643  else if (LangOpts.CUDA)
2644    Lang = InputKind::CUDA;
2645  else if (LangOpts.RenderScript)
2646    Lang = InputKind::RenderScript;
2647  else if (LangOpts.CPlusPlus)
2648    Lang = LangOpts.ObjC ? InputKind::ObjCXX : InputKind::CXX;
2649  else
2650    Lang = LangOpts.ObjC ? InputKind::ObjC : InputKind::C;
2651
2652  InputKind::Format Fmt = InputKind::Source;
2653  if (LangOpts.getCompilingModule() == LangOptions::CMK_ModuleMap)
2654    Fmt = InputKind::ModuleMap;
2655
2656  // We don't know if input was preprocessed. Assume not.
2657  bool PP = false;
2658
2659  return InputKind(Lang, Fmt, PP);
2660}
2661
2662#ifndef NDEBUG
2663ASTUnit::ConcurrencyState::ConcurrencyState() {
2664  Mutex = new llvm::sys::MutexImpl(/*recursive=*/true);
2665}
2666
2667ASTUnit::ConcurrencyState::~ConcurrencyState() {
2668  delete static_cast<llvm::sys::MutexImpl *>(Mutex);
2669}
2670
2671void ASTUnit::ConcurrencyState::start() {
2672  bool acquired = static_cast<llvm::sys::MutexImpl *>(Mutex)->tryacquire();
2673   (0) . __assert_fail ("acquired && \"Concurrent access to ASTUnit!\"", "/home/seafit/code_projects/clang_source/clang/lib/Frontend/ASTUnit.cpp", 2673, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(acquired && "Concurrent access to ASTUnit!");
2674}
2675
2676void ASTUnit::ConcurrencyState::finish() {
2677  static_cast<llvm::sys::MutexImpl *>(Mutex)->release();
2678}
2679
2680#else // NDEBUG
2681
2682ASTUnit::ConcurrencyState::ConcurrencyState() { Mutex = nullptr; }
2683ASTUnit::ConcurrencyState::~ConcurrencyState() {}
2684void ASTUnit::ConcurrencyState::start() {}
2685void ASTUnit::ConcurrencyState::finish() {}
2686
2687#endif // NDEBUG
2688
clang::ASTUnit::ASTWriterData
clang::ASTUnit::ASTWriterData::Buffer
clang::ASTUnit::ASTWriterData::Stream
clang::ASTUnit::ASTWriterData::Writer
clang::ASTUnit::clearFileLevelDecls
clang::ASTUnit::setPreprocessor
clang::ASTUnit::enableSourceFileDiagnostics
clang::ASTUnit::CacheCodeCompletionResults
clang::ASTUnit::ClearCachedCompletionResults
clang::ASTUnit::getASTReader
clang::ASTUnit::getASTMutationListener
clang::ASTUnit::getDeserializationListener
clang::ASTUnit::getBufferForFile
clang::ASTUnit::ConfigureDiags
clang::ASTUnit::LoadFromASTFile
clang::ASTUnit::Parse
clang::ASTUnit::getMainBufferWithPrecompiledPreamble
clang::ASTUnit::RealizeTopLevelDeclsFromPreamble
clang::ASTUnit::transferASTDataFromCompilerInstance
clang::ASTUnit::getMainFileName
clang::ASTUnit::getASTFileName
clang::ASTUnit::create
clang::ASTUnit::LoadFromCompilerInvocationAction
clang::ASTUnit::LoadFromCompilerInvocation
clang::ASTUnit::LoadFromCompilerInvocation
clang::ASTUnit::LoadFromCommandLine
clang::ASTUnit::Reparse
clang::ASTUnit::ResetForParse
clang::ASTUnit::CodeComplete
clang::ASTUnit::Save
clang::ASTUnit::serialize
clang::ASTUnit::TranslateStoredDiagnostics
clang::ASTUnit::addFileLevelDecl
clang::ASTUnit::findFileRegionDecls
clang::ASTUnit::getLocation
clang::ASTUnit::getLocation
clang::ASTUnit::mapLocationFromPreamble
clang::ASTUnit::mapLocationToPreamble
clang::ASTUnit::isInPreambleFileID
clang::ASTUnit::isInMainFileID
clang::ASTUnit::getEndOfPreambleFileID
clang::ASTUnit::getStartOfMainFileID
clang::ASTUnit::getLocalPreprocessingEntities
clang::ASTUnit::visitLocalTopLevelDecls
clang::ASTUnit::getPCHFile
clang::ASTUnit::isModuleFile
clang::ASTUnit::getInputKind
clang::ASTUnit::ConcurrencyState::start
clang::ASTUnit::ConcurrencyState::finish
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