clang  9.0.0svn
ModuleManager.cpp
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1 //===- ModuleManager.cpp - Module Manager ---------------------------------===//
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 // This file defines the ModuleManager class, which manages a set of loaded
10 // modules for the ASTReader.
11 //
12 //===----------------------------------------------------------------------===//
13 
16 #include "clang/Basic/LLVM.h"
18 #include "clang/Lex/HeaderSearch.h"
19 #include "clang/Lex/ModuleMap.h"
23 #include "llvm/ADT/STLExtras.h"
24 #include "llvm/ADT/SetVector.h"
25 #include "llvm/ADT/SmallPtrSet.h"
26 #include "llvm/ADT/SmallVector.h"
27 #include "llvm/ADT/StringRef.h"
28 #include "llvm/ADT/iterator.h"
29 #include "llvm/Support/Chrono.h"
30 #include "llvm/Support/DOTGraphTraits.h"
31 #include "llvm/Support/ErrorOr.h"
32 #include "llvm/Support/GraphWriter.h"
33 #include "llvm/Support/MemoryBuffer.h"
34 #include "llvm/Support/VirtualFileSystem.h"
35 #include <algorithm>
36 #include <cassert>
37 #include <memory>
38 #include <string>
39 #include <system_error>
40 
41 using namespace clang;
42 using namespace serialization;
43 
45  const FileEntry *Entry = FileMgr.getFile(Name, /*openFile=*/false,
46  /*cacheFailure=*/false);
47  if (Entry)
48  return lookup(Entry);
49 
50  return nullptr;
51 }
52 
54  if (const Module *Mod = HeaderSearchInfo.getModuleMap().findModule(Name))
55  if (const FileEntry *File = Mod->getASTFile())
56  return lookup(File);
57 
58  return nullptr;
59 }
60 
62  auto Known = Modules.find(File);
63  if (Known == Modules.end())
64  return nullptr;
65 
66  return Known->second;
67 }
68 
69 std::unique_ptr<llvm::MemoryBuffer>
70 ModuleManager::lookupBuffer(StringRef Name) {
71  const FileEntry *Entry = FileMgr.getFile(Name, /*openFile=*/false,
72  /*cacheFailure=*/false);
73  return std::move(InMemoryBuffers[Entry]);
74 }
75 
76 static bool checkSignature(ASTFileSignature Signature,
77  ASTFileSignature ExpectedSignature,
78  std::string &ErrorStr) {
79  if (!ExpectedSignature || Signature == ExpectedSignature)
80  return false;
81 
82  ErrorStr =
83  Signature ? "signature mismatch" : "could not read module signature";
84  return true;
85 }
86 
87 static void updateModuleImports(ModuleFile &MF, ModuleFile *ImportedBy,
88  SourceLocation ImportLoc) {
89  if (ImportedBy) {
90  MF.ImportedBy.insert(ImportedBy);
91  ImportedBy->Imports.insert(&MF);
92  } else {
93  if (!MF.DirectlyImported)
94  MF.ImportLoc = ImportLoc;
95 
96  MF.DirectlyImported = true;
97  }
98 }
99 
102  SourceLocation ImportLoc, ModuleFile *ImportedBy,
103  unsigned Generation,
104  off_t ExpectedSize, time_t ExpectedModTime,
105  ASTFileSignature ExpectedSignature,
106  ASTFileSignatureReader ReadSignature,
107  ModuleFile *&Module,
108  std::string &ErrorStr) {
109  Module = nullptr;
110 
111  // Look for the file entry. This only fails if the expected size or
112  // modification time differ.
113  const FileEntry *Entry;
114  if (Type == MK_ExplicitModule || Type == MK_PrebuiltModule) {
115  // If we're not expecting to pull this file out of the module cache, it
116  // might have a different mtime due to being moved across filesystems in
117  // a distributed build. The size must still match, though. (As must the
118  // contents, but we can't check that.)
119  ExpectedModTime = 0;
120  }
121  if (lookupModuleFile(FileName, ExpectedSize, ExpectedModTime, Entry)) {
122  ErrorStr = "module file out of date";
123  return OutOfDate;
124  }
125 
126  if (!Entry && FileName != "-") {
127  ErrorStr = "module file not found";
128  return Missing;
129  }
130 
131  // Check whether we already loaded this module, before
132  if (ModuleFile *ModuleEntry = Modules.lookup(Entry)) {
133  // Check the stored signature.
134  if (checkSignature(ModuleEntry->Signature, ExpectedSignature, ErrorStr))
135  return OutOfDate;
136 
137  Module = ModuleEntry;
138  updateModuleImports(*ModuleEntry, ImportedBy, ImportLoc);
139  return AlreadyLoaded;
140  }
141 
142  // Allocate a new module.
143  auto NewModule = llvm::make_unique<ModuleFile>(Type, Generation);
144  NewModule->Index = Chain.size();
145  NewModule->FileName = FileName.str();
146  NewModule->File = Entry;
147  NewModule->ImportLoc = ImportLoc;
148  NewModule->InputFilesValidationTimestamp = 0;
149 
150  if (NewModule->Kind == MK_ImplicitModule) {
151  std::string TimestampFilename = NewModule->getTimestampFilename();
152  llvm::vfs::Status Status;
153  // A cached stat value would be fine as well.
154  if (!FileMgr.getNoncachedStatValue(TimestampFilename, Status))
155  NewModule->InputFilesValidationTimestamp =
156  llvm::sys::toTimeT(Status.getLastModificationTime());
157  }
158 
159  // Load the contents of the module
160  if (std::unique_ptr<llvm::MemoryBuffer> Buffer = lookupBuffer(FileName)) {
161  // The buffer was already provided for us.
162  NewModule->Buffer = &PCMCache->addBuffer(FileName, std::move(Buffer));
163  // Since the cached buffer is reused, it is safe to close the file
164  // descriptor that was opened while stat()ing the PCM in
165  // lookupModuleFile() above, it won't be needed any longer.
166  Entry->closeFile();
167  } else if (llvm::MemoryBuffer *Buffer = PCMCache->lookupBuffer(FileName)) {
168  NewModule->Buffer = Buffer;
169  // As above, the file descriptor is no longer needed.
170  Entry->closeFile();
171  } else {
172  // Open the AST file.
173  llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> Buf((std::error_code()));
174  if (FileName == "-") {
175  Buf = llvm::MemoryBuffer::getSTDIN();
176  } else {
177  // Get a buffer of the file and close the file descriptor when done.
178  Buf = FileMgr.getBufferForFile(NewModule->File,
179  /*IsVolatile=*/false,
180  /*ShouldClose=*/true);
181  }
182 
183  if (!Buf) {
184  ErrorStr = Buf.getError().message();
185  return Missing;
186  }
187 
188  NewModule->Buffer = &PCMCache->addBuffer(FileName, std::move(*Buf));
189  }
190 
191  // Initialize the stream.
192  NewModule->Data = PCHContainerRdr.ExtractPCH(*NewModule->Buffer);
193 
194  // Read the signature eagerly now so that we can check it. Avoid calling
195  // ReadSignature unless there's something to check though.
196  if (ExpectedSignature && checkSignature(ReadSignature(NewModule->Data),
197  ExpectedSignature, ErrorStr)) {
198  // Try to remove the buffer. If it can't be removed, then it was already
199  // validated by this process.
200  if (!PCMCache->tryToRemoveBuffer(NewModule->FileName))
201  FileMgr.invalidateCache(NewModule->File);
202  return OutOfDate;
203  }
204 
205  // We're keeping this module. Store it everywhere.
206  Module = Modules[Entry] = NewModule.get();
207 
208  updateModuleImports(*NewModule, ImportedBy, ImportLoc);
209 
210  if (!NewModule->isModule())
211  PCHChain.push_back(NewModule.get());
212  if (!ImportedBy)
213  Roots.push_back(NewModule.get());
214 
215  Chain.push_back(std::move(NewModule));
216  return NewlyLoaded;
217 }
218 
220  ModuleIterator First,
221  llvm::SmallPtrSetImpl<ModuleFile *> &LoadedSuccessfully,
222  ModuleMap *modMap) {
223  auto Last = end();
224  if (First == Last)
225  return;
226 
227  // Explicitly clear VisitOrder since we might not notice it is stale.
228  VisitOrder.clear();
229 
230  // Collect the set of module file pointers that we'll be removing.
231  llvm::SmallPtrSet<ModuleFile *, 4> victimSet(
232  (llvm::pointer_iterator<ModuleIterator>(First)),
233  (llvm::pointer_iterator<ModuleIterator>(Last)));
234 
235  auto IsVictim = [&](ModuleFile *MF) {
236  return victimSet.count(MF);
237  };
238  // Remove any references to the now-destroyed modules.
239  for (auto I = begin(); I != First; ++I) {
240  I->Imports.remove_if(IsVictim);
241  I->ImportedBy.remove_if(IsVictim);
242  }
243  Roots.erase(std::remove_if(Roots.begin(), Roots.end(), IsVictim),
244  Roots.end());
245 
246  // Remove the modules from the PCH chain.
247  for (auto I = First; I != Last; ++I) {
248  if (!I->isModule()) {
249  PCHChain.erase(std::find(PCHChain.begin(), PCHChain.end(), &*I),
250  PCHChain.end());
251  break;
252  }
253  }
254 
255  // Delete the modules and erase them from the various structures.
256  for (ModuleIterator victim = First; victim != Last; ++victim) {
257  Modules.erase(victim->File);
258 
259  if (modMap) {
260  StringRef ModuleName = victim->ModuleName;
261  if (Module *mod = modMap->findModule(ModuleName)) {
262  mod->setASTFile(nullptr);
263  }
264  }
265 
266  // Files that didn't make it through ReadASTCore successfully will be
267  // rebuilt (or there was an error). Invalidate them so that we can load the
268  // new files that will be renamed over the old ones.
269  //
270  // The PCMCache tracks whether the module was successfully loaded in another
271  // thread/context; in that case, it won't need to be rebuilt (and we can't
272  // safely invalidate it anyway).
273  if (LoadedSuccessfully.count(&*victim) == 0 &&
274  !PCMCache->tryToRemoveBuffer(victim->FileName))
275  FileMgr.invalidateCache(victim->File);
276  }
277 
278  // Delete the modules.
279  Chain.erase(Chain.begin() + (First - begin()), Chain.end());
280 }
281 
282 void
284  std::unique_ptr<llvm::MemoryBuffer> Buffer) {
285  const FileEntry *Entry =
286  FileMgr.getVirtualFile(FileName, Buffer->getBufferSize(), 0);
287  InMemoryBuffers[Entry] = std::move(Buffer);
288 }
289 
290 ModuleManager::VisitState *ModuleManager::allocateVisitState() {
291  // Fast path: if we have a cached state, use it.
292  if (FirstVisitState) {
293  VisitState *Result = FirstVisitState;
294  FirstVisitState = FirstVisitState->NextState;
295  Result->NextState = nullptr;
296  return Result;
297  }
298 
299  // Allocate and return a new state.
300  return new VisitState(size());
301 }
302 
303 void ModuleManager::returnVisitState(VisitState *State) {
304  assert(State->NextState == nullptr && "Visited state is in list?");
305  State->NextState = FirstVisitState;
306  FirstVisitState = State;
307 }
308 
310  GlobalIndex = Index;
311  if (!GlobalIndex) {
312  ModulesInCommonWithGlobalIndex.clear();
313  return;
314  }
315 
316  // Notify the global module index about all of the modules we've already
317  // loaded.
318  for (ModuleFile &M : *this)
319  if (!GlobalIndex->loadedModuleFile(&M))
320  ModulesInCommonWithGlobalIndex.push_back(&M);
321 }
322 
324  if (!GlobalIndex || GlobalIndex->loadedModuleFile(MF))
325  return;
326 
327  ModulesInCommonWithGlobalIndex.push_back(MF);
328 }
329 
331  const PCHContainerReader &PCHContainerRdr,
332  const HeaderSearch& HeaderSearchInfo)
333  : FileMgr(FileMgr), PCMCache(&PCMCache), PCHContainerRdr(PCHContainerRdr),
334  HeaderSearchInfo(HeaderSearchInfo) {}
335 
336 ModuleManager::~ModuleManager() { delete FirstVisitState; }
337 
338 void ModuleManager::visit(llvm::function_ref<bool(ModuleFile &M)> Visitor,
339  llvm::SmallPtrSetImpl<ModuleFile *> *ModuleFilesHit) {
340  // If the visitation order vector is the wrong size, recompute the order.
341  if (VisitOrder.size() != Chain.size()) {
342  unsigned N = size();
343  VisitOrder.clear();
344  VisitOrder.reserve(N);
345 
346  // Record the number of incoming edges for each module. When we
347  // encounter a module with no incoming edges, push it into the queue
348  // to seed the queue.
350  Queue.reserve(N);
351  llvm::SmallVector<unsigned, 4> UnusedIncomingEdges;
352  UnusedIncomingEdges.resize(size());
353  for (ModuleFile &M : llvm::reverse(*this)) {
354  unsigned Size = M.ImportedBy.size();
355  UnusedIncomingEdges[M.Index] = Size;
356  if (!Size)
357  Queue.push_back(&M);
358  }
359 
360  // Traverse the graph, making sure to visit a module before visiting any
361  // of its dependencies.
362  while (!Queue.empty()) {
363  ModuleFile *CurrentModule = Queue.pop_back_val();
364  VisitOrder.push_back(CurrentModule);
365 
366  // For any module that this module depends on, push it on the
367  // stack (if it hasn't already been marked as visited).
368  for (auto M = CurrentModule->Imports.rbegin(),
369  MEnd = CurrentModule->Imports.rend();
370  M != MEnd; ++M) {
371  // Remove our current module as an impediment to visiting the
372  // module we depend on. If we were the last unvisited module
373  // that depends on this particular module, push it into the
374  // queue to be visited.
375  unsigned &NumUnusedEdges = UnusedIncomingEdges[(*M)->Index];
376  if (NumUnusedEdges && (--NumUnusedEdges == 0))
377  Queue.push_back(*M);
378  }
379  }
380 
381  assert(VisitOrder.size() == N && "Visitation order is wrong?");
382 
383  delete FirstVisitState;
384  FirstVisitState = nullptr;
385  }
386 
387  VisitState *State = allocateVisitState();
388  unsigned VisitNumber = State->NextVisitNumber++;
389 
390  // If the caller has provided us with a hit-set that came from the global
391  // module index, mark every module file in common with the global module
392  // index that is *not* in that set as 'visited'.
393  if (ModuleFilesHit && !ModulesInCommonWithGlobalIndex.empty()) {
394  for (unsigned I = 0, N = ModulesInCommonWithGlobalIndex.size(); I != N; ++I)
395  {
396  ModuleFile *M = ModulesInCommonWithGlobalIndex[I];
397  if (!ModuleFilesHit->count(M))
398  State->VisitNumber[M->Index] = VisitNumber;
399  }
400  }
401 
402  for (unsigned I = 0, N = VisitOrder.size(); I != N; ++I) {
403  ModuleFile *CurrentModule = VisitOrder[I];
404  // Should we skip this module file?
405  if (State->VisitNumber[CurrentModule->Index] == VisitNumber)
406  continue;
407 
408  // Visit the module.
409  assert(State->VisitNumber[CurrentModule->Index] == VisitNumber - 1);
410  State->VisitNumber[CurrentModule->Index] = VisitNumber;
411  if (!Visitor(*CurrentModule))
412  continue;
413 
414  // The visitor has requested that cut off visitation of any
415  // module that the current module depends on. To indicate this
416  // behavior, we mark all of the reachable modules as having been visited.
417  ModuleFile *NextModule = CurrentModule;
418  do {
419  // For any module that this module depends on, push it on the
420  // stack (if it hasn't already been marked as visited).
421  for (llvm::SetVector<ModuleFile *>::iterator
422  M = NextModule->Imports.begin(),
423  MEnd = NextModule->Imports.end();
424  M != MEnd; ++M) {
425  if (State->VisitNumber[(*M)->Index] != VisitNumber) {
426  State->Stack.push_back(*M);
427  State->VisitNumber[(*M)->Index] = VisitNumber;
428  }
429  }
430 
431  if (State->Stack.empty())
432  break;
433 
434  // Pop the next module off the stack.
435  NextModule = State->Stack.pop_back_val();
436  } while (true);
437  }
438 
439  returnVisitState(State);
440 }
441 
442 bool ModuleManager::lookupModuleFile(StringRef FileName,
443  off_t ExpectedSize,
444  time_t ExpectedModTime,
445  const FileEntry *&File) {
446  if (FileName == "-") {
447  File = nullptr;
448  return false;
449  }
450 
451  // Open the file immediately to ensure there is no race between stat'ing and
452  // opening the file.
453  File = FileMgr.getFile(FileName, /*openFile=*/true, /*cacheFailure=*/false);
454  if (!File)
455  return false;
456 
457  if ((ExpectedSize && ExpectedSize != File->getSize()) ||
458  (ExpectedModTime && ExpectedModTime != File->getModificationTime()))
459  // Do not destroy File, as it may be referenced. If we need to rebuild it,
460  // it will be destroyed by removeModules.
461  return true;
462 
463  return false;
464 }
465 
466 #ifndef NDEBUG
467 namespace llvm {
468 
469  template<>
471  using NodeRef = ModuleFile *;
472  using ChildIteratorType = llvm::SetVector<ModuleFile *>::const_iterator;
473  using nodes_iterator = pointer_iterator<ModuleManager::ModuleConstIterator>;
474 
476  return Node->Imports.begin();
477  }
478 
480  return Node->Imports.end();
481  }
482 
483  static nodes_iterator nodes_begin(const ModuleManager &Manager) {
484  return nodes_iterator(Manager.begin());
485  }
486 
487  static nodes_iterator nodes_end(const ModuleManager &Manager) {
488  return nodes_iterator(Manager.end());
489  }
490  };
491 
492  template<>
494  explicit DOTGraphTraits(bool IsSimple = false)
495  : DefaultDOTGraphTraits(IsSimple) {}
496 
497  static bool renderGraphFromBottomUp() { return true; }
498 
499  std::string getNodeLabel(ModuleFile *M, const ModuleManager&) {
500  return M->ModuleName;
501  }
502  };
503 
504 } // namespace llvm
505 
507  llvm::ViewGraph(*this, "Modules");
508 }
509 #endif
Implements support for file system lookup, file system caching, and directory search management...
Definition: FileManager.h:121
llvm::SetVector< ModuleFile * >::const_iterator ChildIteratorType
ModuleFile * lookup(const FileEntry *File) const
Returns the module associated with the given module file.
Defines the clang::FileManager interface and associated types.
time_t getModificationTime() const
Definition: FileManager.h:92
DominatorTree GraphTraits specialization so the DominatorTree can be iterable by generic graph iterat...
Definition: Dominators.h:29
void closeFile() const
Definition: FileManager.h:103
std::string ModuleName
The name of the module.
Definition: Module.h:125
The module file is out-of-date.
The base class of the type hierarchy.
Definition: Type.h:1406
unsigned Index
The index of this module in the list of modules.
Definition: Module.h:116
ModuleFile * lookupByFileName(StringRef FileName) const
Returns the module associated with the given file name.
Manages the set of modules loaded by an AST reader.
Definition: ModuleManager.h:48
Manage memory buffers across multiple users.
ModuleMap & getModuleMap()
Retrieve the module map.
Definition: HeaderSearch.h:654
SourceLocation ImportLoc
The source location where this module was first imported.
Definition: Module.h:204
AddModuleResult
The result of attempting to add a new module.
ModuleIterator begin()
Forward iterator to traverse all loaded modules.
LineState State
ModuleManager(FileManager &FileMgr, MemoryBufferCache &PCMCache, const PCHContainerReader &PCHContainerRdr, const HeaderSearch &HeaderSearchInfo)
void viewGraph()
View the graphviz representation of the module graph.
void visit(llvm::function_ref< bool(ModuleFile &M)> Visitor, llvm::SmallPtrSetImpl< ModuleFile *> *ModuleFilesHit=nullptr)
Visit each of the modules.
The signature of a module, which is a hash of the AST content.
Definition: Module.h:54
void setGlobalIndex(GlobalModuleIndex *Index)
Set the global module index.
Describes a module or submodule.
Definition: Module.h:64
virtual llvm::StringRef ExtractPCH(llvm::MemoryBufferRef Buffer) const =0
Returns the serialized AST inside the PCH container Buffer.
Module * findModule(StringRef Name) const
Retrieve a module with the given name.
Definition: ModuleMap.cpp:764
Forward-declares and imports various common LLVM datatypes that clang wants to use unqualified...
bool lookupModuleFile(StringRef FileName, off_t ExpectedSize, time_t ExpectedModTime, const FileEntry *&File)
Attempt to resolve the given module file name to a file entry.
ModuleIterator end()
Forward iterator end-point to traverse all loaded modules.
This abstract interface provides operations for unwrapping containers for serialized ASTs (precompile...
Encapsulates the information needed to find the file referenced by a #include or #include_next, (sub-)framework lookup, etc.
Definition: HeaderSearch.h:147
const FileEntry * getFile(StringRef Filename, bool OpenFile=false, bool CacheFailure=true)
Lookup, cache, and verify the specified file (real or virtual).
ASTFileSignature(*)(StringRef) ASTFileSignatureReader
ModuleKind
Specifies the kind of module that has been loaded.
Definition: Module.h:42
File is from a prebuilt module path.
Definition: Module.h:59
static nodes_iterator nodes_end(const ModuleManager &Manager)
DOTGraphTraits(bool isSimple=false)
Information about a module that has been loaded by the ASTReader.
Definition: Module.h:107
AddModuleResult addModule(StringRef FileName, ModuleKind Type, SourceLocation ImportLoc, ModuleFile *ImportedBy, unsigned Generation, off_t ExpectedSize, time_t ExpectedModTime, ASTFileSignature ExpectedSignature, ASTFileSignatureReader ReadSignature, ModuleFile *&Module, std::string &ErrorStr)
Attempts to create a new module and add it to the list of known modules.
void addInMemoryBuffer(StringRef FileName, std::unique_ptr< llvm::MemoryBuffer > Buffer)
Add an in-memory buffer the list of known buffers.
static nodes_iterator nodes_begin(const ModuleManager &Manager)
Encodes a location in the source.
File is an implicitly-loaded module.
Definition: Module.h:44
Cached information about one file (either on disk or in the virtual file system). ...
Definition: FileManager.h:59
static ChildIteratorType child_begin(NodeRef Node)
const FileEntry * getVirtualFile(StringRef Filename, off_t Size, time_t ModificationTime)
Retrieve a file entry for a "virtual" file that acts as if there were a file with the given name on d...
llvm::SetVector< ModuleFile * > ImportedBy
List of modules which depend on this module.
Definition: Module.h:466
A global index for a set of module files, providing information about the identifiers within those mo...
The module file was just loaded in response to this call.
pointer_iterator< ModuleManager::ModuleConstIterator > nodes_iterator
ast_type_traits::DynTypedNode Node
Dataflow Directional Tag Classes.
off_t getSize() const
Definition: FileManager.h:88
File is an explicitly-loaded module.
Definition: Module.h:47
ModuleFile * lookupByModuleName(StringRef ModName) const
Returns the module associated with the given module name.
llvm::ErrorOr< std::unique_ptr< llvm::MemoryBuffer > > getBufferForFile(const FileEntry *Entry, bool isVolatile=false, bool ShouldCloseOpenFile=true)
Open the specified file as a MemoryBuffer, returning a new MemoryBuffer if successful, otherwise returning null.
static void updateModuleImports(ModuleFile &MF, ModuleFile *ImportedBy, SourceLocation ImportLoc)
bool getNoncachedStatValue(StringRef Path, llvm::vfs::Status &Result)
Get the &#39;stat&#39; information for the given Path.
void removeModules(ModuleIterator First, llvm::SmallPtrSetImpl< ModuleFile *> &LoadedSuccessfully, ModuleMap *modMap)
Remove the modules starting from First (to the end).
void moduleFileAccepted(ModuleFile *MF)
Notification from the AST reader that the given module file has been "accepted", and will not (can no...
std::string getNodeLabel(ModuleFile *M, const ModuleManager &)
unsigned size() const
Number of modules loaded.
The module file had already been loaded.
void invalidateCache(const FileEntry *Entry)
Remove the real file Entry from the cache.
static ChildIteratorType child_end(NodeRef Node)
llvm::pointee_iterator< SmallVectorImpl< std::unique_ptr< ModuleFile > >::iterator > ModuleIterator
bool DirectlyImported
Whether this module has been directly imported by the user.
Definition: Module.h:171
llvm::SetVector< ModuleFile * > Imports
List of modules which this module depends on.
Definition: Module.h:469
std::unique_ptr< llvm::MemoryBuffer > lookupBuffer(StringRef Name)
Returns the in-memory (virtual file) buffer with the given name.
bool loadedModuleFile(ModuleFile *File)
Note that the given module file has been loaded.
static bool checkSignature(ASTFileSignature Signature, ASTFileSignature ExpectedSignature, std::string &ErrorStr)