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1 //===- CIndexCodeCompletion.cpp - Code Completion API hooks ---------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the Clang-C Source Indexing library hooks for
11 // code completion.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #include "CIndexer.h"
16 #include "CXTranslationUnit.h"
17 #include "CXString.h"
18 #include "CXCursor.h"
19 #include "CXString.h"
20 #include "CIndexDiagnostic.h"
21 #include "clang/AST/Type.h"
22 #include "clang/AST/Decl.h"
23 #include "clang/AST/DeclObjC.h"
24 #include "clang/Basic/SourceManager.h"
25 #include "clang/Basic/FileManager.h"
26 #include "clang/Frontend/ASTUnit.h"
27 #include "clang/Frontend/CompilerInstance.h"
28 #include "clang/Frontend/FrontendDiagnostic.h"
29 #include "clang/Sema/CodeCompleteConsumer.h"
30 #include "llvm/ADT/SmallString.h"
31 #include "llvm/ADT/StringExtras.h"
32 #include "llvm/Support/Atomic.h"
33 #include "llvm/Support/CrashRecoveryContext.h"
34 #include "llvm/Support/MemoryBuffer.h"
35 #include "llvm/Support/Timer.h"
36 #include "llvm/Support/raw_ostream.h"
37 #include "llvm/Support/Program.h"
38 #include <cstdlib>
39 #include <cstdio>
40 
41 
42 #ifdef UDP_CODE_COMPLETION_LOGGER
43 #include "clang/Basic/Version.h"
44 #include <arpa/inet.h>
45 #include <sys/socket.h>
46 #include <sys/types.h>
47 #include <unistd.h>
48 #endif
49 
50 using namespace clang;
51 using namespace clang::cxstring;
52 
53 extern "C" {
54 
55 enum CXCompletionChunkKind
clang_getCompletionChunkKind(CXCompletionString completion_string,unsigned chunk_number)56 clang_getCompletionChunkKind(CXCompletionString completion_string,
57                              unsigned chunk_number) {
58   CodeCompletionString *CCStr = (CodeCompletionString *)completion_string;
59   if (!CCStr || chunk_number >= CCStr->size())
60     return CXCompletionChunk_Text;
61 
62   switch ((*CCStr)[chunk_number].Kind) {
63   case CodeCompletionString::CK_TypedText:
64     return CXCompletionChunk_TypedText;
65   case CodeCompletionString::CK_Text:
66     return CXCompletionChunk_Text;
67   case CodeCompletionString::CK_Optional:
68     return CXCompletionChunk_Optional;
69   case CodeCompletionString::CK_Placeholder:
70     return CXCompletionChunk_Placeholder;
71   case CodeCompletionString::CK_Informative:
72     return CXCompletionChunk_Informative;
73   case CodeCompletionString::CK_ResultType:
74     return CXCompletionChunk_ResultType;
75   case CodeCompletionString::CK_CurrentParameter:
76     return CXCompletionChunk_CurrentParameter;
77   case CodeCompletionString::CK_LeftParen:
78     return CXCompletionChunk_LeftParen;
79   case CodeCompletionString::CK_RightParen:
80     return CXCompletionChunk_RightParen;
81   case CodeCompletionString::CK_LeftBracket:
82     return CXCompletionChunk_LeftBracket;
83   case CodeCompletionString::CK_RightBracket:
84     return CXCompletionChunk_RightBracket;
85   case CodeCompletionString::CK_LeftBrace:
86     return CXCompletionChunk_LeftBrace;
87   case CodeCompletionString::CK_RightBrace:
88     return CXCompletionChunk_RightBrace;
89   case CodeCompletionString::CK_LeftAngle:
90     return CXCompletionChunk_LeftAngle;
91   case CodeCompletionString::CK_RightAngle:
92     return CXCompletionChunk_RightAngle;
93   case CodeCompletionString::CK_Comma:
94     return CXCompletionChunk_Comma;
95   case CodeCompletionString::CK_Colon:
96     return CXCompletionChunk_Colon;
97   case CodeCompletionString::CK_SemiColon:
98     return CXCompletionChunk_SemiColon;
99   case CodeCompletionString::CK_Equal:
100     return CXCompletionChunk_Equal;
101   case CodeCompletionString::CK_HorizontalSpace:
102     return CXCompletionChunk_HorizontalSpace;
103   case CodeCompletionString::CK_VerticalSpace:
104     return CXCompletionChunk_VerticalSpace;
105   }
106 
107   llvm_unreachable("Invalid CompletionKind!");
108 }
109 
clang_getCompletionChunkText(CXCompletionString completion_string,unsigned chunk_number)110 CXString clang_getCompletionChunkText(CXCompletionString completion_string,
111                                       unsigned chunk_number) {
112   CodeCompletionString *CCStr = (CodeCompletionString *)completion_string;
113   if (!CCStr || chunk_number >= CCStr->size())
114     return createCXString((const char*)0);
115 
116   switch ((*CCStr)[chunk_number].Kind) {
117   case CodeCompletionString::CK_TypedText:
118   case CodeCompletionString::CK_Text:
119   case CodeCompletionString::CK_Placeholder:
120   case CodeCompletionString::CK_CurrentParameter:
121   case CodeCompletionString::CK_Informative:
122   case CodeCompletionString::CK_LeftParen:
123   case CodeCompletionString::CK_RightParen:
124   case CodeCompletionString::CK_LeftBracket:
125   case CodeCompletionString::CK_RightBracket:
126   case CodeCompletionString::CK_LeftBrace:
127   case CodeCompletionString::CK_RightBrace:
128   case CodeCompletionString::CK_LeftAngle:
129   case CodeCompletionString::CK_RightAngle:
130   case CodeCompletionString::CK_Comma:
131   case CodeCompletionString::CK_ResultType:
132   case CodeCompletionString::CK_Colon:
133   case CodeCompletionString::CK_SemiColon:
134   case CodeCompletionString::CK_Equal:
135   case CodeCompletionString::CK_HorizontalSpace:
136   case CodeCompletionString::CK_VerticalSpace:
137     return createCXString((*CCStr)[chunk_number].Text, false);
138 
139   case CodeCompletionString::CK_Optional:
140     // Note: treated as an empty text block.
141     return createCXString("");
142   }
143 
144   llvm_unreachable("Invalid CodeCompletionString Kind!");
145 }
146 
147 
148 CXCompletionString
clang_getCompletionChunkCompletionString(CXCompletionString completion_string,unsigned chunk_number)149 clang_getCompletionChunkCompletionString(CXCompletionString completion_string,
150                                          unsigned chunk_number) {
151   CodeCompletionString *CCStr = (CodeCompletionString *)completion_string;
152   if (!CCStr || chunk_number >= CCStr->size())
153     return 0;
154 
155   switch ((*CCStr)[chunk_number].Kind) {
156   case CodeCompletionString::CK_TypedText:
157   case CodeCompletionString::CK_Text:
158   case CodeCompletionString::CK_Placeholder:
159   case CodeCompletionString::CK_CurrentParameter:
160   case CodeCompletionString::CK_Informative:
161   case CodeCompletionString::CK_LeftParen:
162   case CodeCompletionString::CK_RightParen:
163   case CodeCompletionString::CK_LeftBracket:
164   case CodeCompletionString::CK_RightBracket:
165   case CodeCompletionString::CK_LeftBrace:
166   case CodeCompletionString::CK_RightBrace:
167   case CodeCompletionString::CK_LeftAngle:
168   case CodeCompletionString::CK_RightAngle:
169   case CodeCompletionString::CK_Comma:
170   case CodeCompletionString::CK_ResultType:
171   case CodeCompletionString::CK_Colon:
172   case CodeCompletionString::CK_SemiColon:
173   case CodeCompletionString::CK_Equal:
174   case CodeCompletionString::CK_HorizontalSpace:
175   case CodeCompletionString::CK_VerticalSpace:
176     return 0;
177 
178   case CodeCompletionString::CK_Optional:
179     // Note: treated as an empty text block.
180     return (*CCStr)[chunk_number].Optional;
181   }
182 
183   llvm_unreachable("Invalid CompletionKind!");
184 }
185 
clang_getNumCompletionChunks(CXCompletionString completion_string)186 unsigned clang_getNumCompletionChunks(CXCompletionString completion_string) {
187   CodeCompletionString *CCStr = (CodeCompletionString *)completion_string;
188   return CCStr? CCStr->size() : 0;
189 }
190 
clang_getCompletionPriority(CXCompletionString completion_string)191 unsigned clang_getCompletionPriority(CXCompletionString completion_string) {
192   CodeCompletionString *CCStr = (CodeCompletionString *)completion_string;
193   return CCStr? CCStr->getPriority() : unsigned(CCP_Unlikely);
194 }
195 
196 enum CXAvailabilityKind
clang_getCompletionAvailability(CXCompletionString completion_string)197 clang_getCompletionAvailability(CXCompletionString completion_string) {
198   CodeCompletionString *CCStr = (CodeCompletionString *)completion_string;
199   return CCStr? static_cast<CXAvailabilityKind>(CCStr->getAvailability())
200               : CXAvailability_Available;
201 }
202 
clang_getCompletionNumAnnotations(CXCompletionString completion_string)203 unsigned clang_getCompletionNumAnnotations(CXCompletionString completion_string)
204 {
205   CodeCompletionString *CCStr = (CodeCompletionString *)completion_string;
206   return CCStr ? CCStr->getAnnotationCount() : 0;
207 }
208 
clang_getCompletionAnnotation(CXCompletionString completion_string,unsigned annotation_number)209 CXString clang_getCompletionAnnotation(CXCompletionString completion_string,
210                                        unsigned annotation_number) {
211   CodeCompletionString *CCStr = (CodeCompletionString *)completion_string;
212   return CCStr ? createCXString(CCStr->getAnnotation(annotation_number))
213                : createCXString((const char *) 0);
214 }
215 
216 CXString
clang_getCompletionParent(CXCompletionString completion_string,CXCursorKind * kind)217 clang_getCompletionParent(CXCompletionString completion_string,
218                           CXCursorKind *kind) {
219   if (kind)
220     *kind = CXCursor_NotImplemented;
221 
222   CodeCompletionString *CCStr = (CodeCompletionString *)completion_string;
223   if (!CCStr)
224     return createCXString((const char *)0);
225 
226   if (kind)
227     *kind = CCStr->getParentContextKind();
228   return createCXString(CCStr->getParentContextName(), /*DupString=*/false);
229 }
230 
231 /// \brief The CXCodeCompleteResults structure we allocate internally;
232 /// the client only sees the initial CXCodeCompleteResults structure.
233 struct AllocatedCXCodeCompleteResults : public CXCodeCompleteResults {
234   AllocatedCXCodeCompleteResults(const FileSystemOptions& FileSystemOpts);
235   ~AllocatedCXCodeCompleteResults();
236 
237   /// \brief Diagnostics produced while performing code completion.
238   SmallVector<StoredDiagnostic, 8> Diagnostics;
239 
240   /// \brief Diag object
241   IntrusiveRefCntPtr<DiagnosticsEngine> Diag;
242 
243   /// \brief Language options used to adjust source locations.
244   LangOptions LangOpts;
245 
246   FileSystemOptions FileSystemOpts;
247 
248   /// \brief File manager, used for diagnostics.
249   IntrusiveRefCntPtr<FileManager> FileMgr;
250 
251   /// \brief Source manager, used for diagnostics.
252   IntrusiveRefCntPtr<SourceManager> SourceMgr;
253 
254   /// \brief Temporary files that should be removed once we have finished
255   /// with the code-completion results.
256   std::vector<llvm::sys::Path> TemporaryFiles;
257 
258   /// \brief Temporary buffers that will be deleted once we have finished with
259   /// the code-completion results.
260   SmallVector<const llvm::MemoryBuffer *, 1> TemporaryBuffers;
261 
262   /// \brief Allocator used to store globally cached code-completion results.
263   IntrusiveRefCntPtr<clang::GlobalCodeCompletionAllocator>
264     CachedCompletionAllocator;
265 
266   /// \brief Allocator used to store code completion results.
267   IntrusiveRefCntPtr<clang::GlobalCodeCompletionAllocator>
268     CodeCompletionAllocator;
269 
270   /// \brief Context under which completion occurred.
271   enum clang::CodeCompletionContext::Kind ContextKind;
272 
273   /// \brief A bitfield representing the acceptable completions for the
274   /// current context.
275   unsigned long long Contexts;
276 
277   /// \brief The kind of the container for the current context for completions.
278   enum CXCursorKind ContainerKind;
279   /// \brief The USR of the container for the current context for completions.
280   CXString ContainerUSR;
281   /// \brief a boolean value indicating whether there is complete information
282   /// about the container
283   unsigned ContainerIsIncomplete;
284 
285   /// \brief A string containing the Objective-C selector entered thus far for a
286   /// message send.
287   std::string Selector;
288 };
289 
290 /// \brief Tracks the number of code-completion result objects that are
291 /// currently active.
292 ///
293 /// Used for debugging purposes only.
294 static llvm::sys::cas_flag CodeCompletionResultObjects;
295 
AllocatedCXCodeCompleteResults(const FileSystemOptions & FileSystemOpts)296 AllocatedCXCodeCompleteResults::AllocatedCXCodeCompleteResults(
297                                       const FileSystemOptions& FileSystemOpts)
298   : CXCodeCompleteResults(),
299     Diag(new DiagnosticsEngine(
300                    IntrusiveRefCntPtr<DiagnosticIDs>(new DiagnosticIDs))),
301     FileSystemOpts(FileSystemOpts),
302     FileMgr(new FileManager(FileSystemOpts)),
303     SourceMgr(new SourceManager(*Diag, *FileMgr)),
304     CodeCompletionAllocator(new clang::GlobalCodeCompletionAllocator),
305     Contexts(CXCompletionContext_Unknown),
306     ContainerKind(CXCursor_InvalidCode),
307     ContainerUSR(createCXString("")),
308     ContainerIsIncomplete(1)
309 {
310   if (getenv("LIBCLANG_OBJTRACKING")) {
311     llvm::sys::AtomicIncrement(&CodeCompletionResultObjects);
312     fprintf(stderr, "+++ %d completion results\n", CodeCompletionResultObjects);
313   }
314 }
315 
~AllocatedCXCodeCompleteResults()316 AllocatedCXCodeCompleteResults::~AllocatedCXCodeCompleteResults() {
317   delete [] Results;
318 
319   clang_disposeString(ContainerUSR);
320 
321   for (unsigned I = 0, N = TemporaryFiles.size(); I != N; ++I)
322     TemporaryFiles[I].eraseFromDisk();
323   for (unsigned I = 0, N = TemporaryBuffers.size(); I != N; ++I)
324     delete TemporaryBuffers[I];
325 
326   if (getenv("LIBCLANG_OBJTRACKING")) {
327     llvm::sys::AtomicDecrement(&CodeCompletionResultObjects);
328     fprintf(stderr, "--- %d completion results\n", CodeCompletionResultObjects);
329   }
330 }
331 
332 } // end extern "C"
333 
getContextsForContextKind(enum CodeCompletionContext::Kind kind,Sema & S)334 static unsigned long long getContextsForContextKind(
335                                           enum CodeCompletionContext::Kind kind,
336                                                     Sema &S) {
337   unsigned long long contexts = 0;
338   switch (kind) {
339     case CodeCompletionContext::CCC_OtherWithMacros: {
340       //We can allow macros here, but we don't know what else is permissible
341       //So we'll say the only thing permissible are macros
342       contexts = CXCompletionContext_MacroName;
343       break;
344     }
345     case CodeCompletionContext::CCC_TopLevel:
346     case CodeCompletionContext::CCC_ObjCIvarList:
347     case CodeCompletionContext::CCC_ClassStructUnion:
348     case CodeCompletionContext::CCC_Type: {
349       contexts = CXCompletionContext_AnyType |
350                  CXCompletionContext_ObjCInterface;
351       if (S.getLangOpts().CPlusPlus) {
352         contexts |= CXCompletionContext_EnumTag |
353                     CXCompletionContext_UnionTag |
354                     CXCompletionContext_StructTag |
355                     CXCompletionContext_ClassTag |
356                     CXCompletionContext_NestedNameSpecifier;
357       }
358       break;
359     }
360     case CodeCompletionContext::CCC_Statement: {
361       contexts = CXCompletionContext_AnyType |
362                  CXCompletionContext_ObjCInterface |
363                  CXCompletionContext_AnyValue;
364       if (S.getLangOpts().CPlusPlus) {
365         contexts |= CXCompletionContext_EnumTag |
366                     CXCompletionContext_UnionTag |
367                     CXCompletionContext_StructTag |
368                     CXCompletionContext_ClassTag |
369                     CXCompletionContext_NestedNameSpecifier;
370       }
371       break;
372     }
373     case CodeCompletionContext::CCC_Expression: {
374       contexts = CXCompletionContext_AnyValue;
375       if (S.getLangOpts().CPlusPlus) {
376         contexts |= CXCompletionContext_AnyType |
377                     CXCompletionContext_ObjCInterface |
378                     CXCompletionContext_EnumTag |
379                     CXCompletionContext_UnionTag |
380                     CXCompletionContext_StructTag |
381                     CXCompletionContext_ClassTag |
382                     CXCompletionContext_NestedNameSpecifier;
383       }
384       break;
385     }
386     case CodeCompletionContext::CCC_ObjCMessageReceiver: {
387       contexts = CXCompletionContext_ObjCObjectValue |
388                  CXCompletionContext_ObjCSelectorValue |
389                  CXCompletionContext_ObjCInterface;
390       if (S.getLangOpts().CPlusPlus) {
391         contexts |= CXCompletionContext_CXXClassTypeValue |
392                     CXCompletionContext_AnyType |
393                     CXCompletionContext_EnumTag |
394                     CXCompletionContext_UnionTag |
395                     CXCompletionContext_StructTag |
396                     CXCompletionContext_ClassTag |
397                     CXCompletionContext_NestedNameSpecifier;
398       }
399       break;
400     }
401     case CodeCompletionContext::CCC_DotMemberAccess: {
402       contexts = CXCompletionContext_DotMemberAccess;
403       break;
404     }
405     case CodeCompletionContext::CCC_ArrowMemberAccess: {
406       contexts = CXCompletionContext_ArrowMemberAccess;
407       break;
408     }
409     case CodeCompletionContext::CCC_ObjCPropertyAccess: {
410       contexts = CXCompletionContext_ObjCPropertyAccess;
411       break;
412     }
413     case CodeCompletionContext::CCC_EnumTag: {
414       contexts = CXCompletionContext_EnumTag |
415                  CXCompletionContext_NestedNameSpecifier;
416       break;
417     }
418     case CodeCompletionContext::CCC_UnionTag: {
419       contexts = CXCompletionContext_UnionTag |
420                  CXCompletionContext_NestedNameSpecifier;
421       break;
422     }
423     case CodeCompletionContext::CCC_ClassOrStructTag: {
424       contexts = CXCompletionContext_StructTag |
425                  CXCompletionContext_ClassTag |
426                  CXCompletionContext_NestedNameSpecifier;
427       break;
428     }
429     case CodeCompletionContext::CCC_ObjCProtocolName: {
430       contexts = CXCompletionContext_ObjCProtocol;
431       break;
432     }
433     case CodeCompletionContext::CCC_Namespace: {
434       contexts = CXCompletionContext_Namespace;
435       break;
436     }
437     case CodeCompletionContext::CCC_PotentiallyQualifiedName: {
438       contexts = CXCompletionContext_NestedNameSpecifier;
439       break;
440     }
441     case CodeCompletionContext::CCC_MacroNameUse: {
442       contexts = CXCompletionContext_MacroName;
443       break;
444     }
445     case CodeCompletionContext::CCC_NaturalLanguage: {
446       contexts = CXCompletionContext_NaturalLanguage;
447       break;
448     }
449     case CodeCompletionContext::CCC_SelectorName: {
450       contexts = CXCompletionContext_ObjCSelectorName;
451       break;
452     }
453     case CodeCompletionContext::CCC_ParenthesizedExpression: {
454       contexts = CXCompletionContext_AnyType |
455                  CXCompletionContext_ObjCInterface |
456                  CXCompletionContext_AnyValue;
457       if (S.getLangOpts().CPlusPlus) {
458         contexts |= CXCompletionContext_EnumTag |
459                     CXCompletionContext_UnionTag |
460                     CXCompletionContext_StructTag |
461                     CXCompletionContext_ClassTag |
462                     CXCompletionContext_NestedNameSpecifier;
463       }
464       break;
465     }
466     case CodeCompletionContext::CCC_ObjCInstanceMessage: {
467       contexts = CXCompletionContext_ObjCInstanceMessage;
468       break;
469     }
470     case CodeCompletionContext::CCC_ObjCClassMessage: {
471       contexts = CXCompletionContext_ObjCClassMessage;
472       break;
473     }
474     case CodeCompletionContext::CCC_ObjCInterfaceName: {
475       contexts = CXCompletionContext_ObjCInterface;
476       break;
477     }
478     case CodeCompletionContext::CCC_ObjCCategoryName: {
479       contexts = CXCompletionContext_ObjCCategory;
480       break;
481     }
482     case CodeCompletionContext::CCC_Other:
483     case CodeCompletionContext::CCC_ObjCInterface:
484     case CodeCompletionContext::CCC_ObjCImplementation:
485     case CodeCompletionContext::CCC_Name:
486     case CodeCompletionContext::CCC_MacroName:
487     case CodeCompletionContext::CCC_PreprocessorExpression:
488     case CodeCompletionContext::CCC_PreprocessorDirective:
489     case CodeCompletionContext::CCC_TypeQualifiers: {
490       //Only Clang results should be accepted, so we'll set all of the other
491       //context bits to 0 (i.e. the empty set)
492       contexts = CXCompletionContext_Unexposed;
493       break;
494     }
495     case CodeCompletionContext::CCC_Recovery: {
496       //We don't know what the current context is, so we'll return unknown
497       //This is the equivalent of setting all of the other context bits
498       contexts = CXCompletionContext_Unknown;
499       break;
500     }
501   }
502   return contexts;
503 }
504 
505 namespace {
506   class CaptureCompletionResults : public CodeCompleteConsumer {
507     AllocatedCXCodeCompleteResults &AllocatedResults;
508     CodeCompletionTUInfo CCTUInfo;
509     SmallVector<CXCompletionResult, 16> StoredResults;
510     CXTranslationUnit *TU;
511   public:
CaptureCompletionResults(AllocatedCXCodeCompleteResults & Results,CXTranslationUnit * TranslationUnit)512     CaptureCompletionResults(AllocatedCXCodeCompleteResults &Results,
513                              CXTranslationUnit *TranslationUnit)
514       : CodeCompleteConsumer(true, false, true, false),
515         AllocatedResults(Results), CCTUInfo(Results.CodeCompletionAllocator),
516         TU(TranslationUnit) { }
~CaptureCompletionResults()517     ~CaptureCompletionResults() { Finish(); }
518 
ProcessCodeCompleteResults(Sema & S,CodeCompletionContext Context,CodeCompletionResult * Results,unsigned NumResults)519     virtual void ProcessCodeCompleteResults(Sema &S,
520                                             CodeCompletionContext Context,
521                                             CodeCompletionResult *Results,
522                                             unsigned NumResults) {
523       StoredResults.reserve(StoredResults.size() + NumResults);
524       for (unsigned I = 0; I != NumResults; ++I) {
525         CodeCompletionString *StoredCompletion
526           = Results[I].CreateCodeCompletionString(S, getAllocator(),
527                                                   getCodeCompletionTUInfo());
528 
529         CXCompletionResult R;
530         R.CursorKind = Results[I].CursorKind;
531         R.CompletionString = StoredCompletion;
532         StoredResults.push_back(R);
533       }
534 
535       enum CodeCompletionContext::Kind contextKind = Context.getKind();
536 
537       AllocatedResults.ContextKind = contextKind;
538       AllocatedResults.Contexts = getContextsForContextKind(contextKind, S);
539 
540       AllocatedResults.Selector = "";
541       if (Context.getNumSelIdents() > 0) {
542         for (unsigned i = 0; i < Context.getNumSelIdents(); i++) {
543           IdentifierInfo *selIdent = Context.getSelIdents()[i];
544           if (selIdent != NULL) {
545             StringRef selectorString = Context.getSelIdents()[i]->getName();
546             AllocatedResults.Selector += selectorString;
547           }
548           AllocatedResults.Selector += ":";
549         }
550       }
551 
552       QualType baseType = Context.getBaseType();
553       NamedDecl *D = NULL;
554 
555       if (!baseType.isNull()) {
556         // Get the declaration for a class/struct/union/enum type
557         if (const TagType *Tag = baseType->getAs<TagType>())
558           D = Tag->getDecl();
559         // Get the @interface declaration for a (possibly-qualified) Objective-C
560         // object pointer type, e.g., NSString*
561         else if (const ObjCObjectPointerType *ObjPtr =
562                  baseType->getAs<ObjCObjectPointerType>())
563           D = ObjPtr->getInterfaceDecl();
564         // Get the @interface declaration for an Objective-C object type
565         else if (const ObjCObjectType *Obj = baseType->getAs<ObjCObjectType>())
566           D = Obj->getInterface();
567         // Get the class for a C++ injected-class-name
568         else if (const InjectedClassNameType *Injected =
569                  baseType->getAs<InjectedClassNameType>())
570           D = Injected->getDecl();
571       }
572 
573       if (D != NULL) {
574         CXCursor cursor = cxcursor::MakeCXCursor(D, *TU);
575 
576         CXCursorKind cursorKind = clang_getCursorKind(cursor);
577         CXString cursorUSR = clang_getCursorUSR(cursor);
578 
579         // Normally, clients of CXString shouldn't care whether or not
580         // a CXString is managed by a pool or by explicitly malloc'ed memory.
581         // However, there are cases when AllocatedResults outlives the
582         // CXTranslationUnit.  This is a workaround that failure mode.
583         if (cxstring::isManagedByPool(cursorUSR)) {
584           CXString heapStr =
585             cxstring::createCXString(clang_getCString(cursorUSR), true);
586           clang_disposeString(cursorUSR);
587           cursorUSR = heapStr;
588         }
589 
590         AllocatedResults.ContainerKind = cursorKind;
591         AllocatedResults.ContainerUSR = cursorUSR;
592 
593         const Type *type = baseType.getTypePtrOrNull();
594         if (type != NULL) {
595           AllocatedResults.ContainerIsIncomplete = type->isIncompleteType();
596         }
597         else {
598           AllocatedResults.ContainerIsIncomplete = 1;
599         }
600       }
601       else {
602         AllocatedResults.ContainerKind = CXCursor_InvalidCode;
603         AllocatedResults.ContainerUSR = createCXString("");
604         AllocatedResults.ContainerIsIncomplete = 1;
605       }
606     }
607 
ProcessOverloadCandidates(Sema & S,unsigned CurrentArg,OverloadCandidate * Candidates,unsigned NumCandidates)608     virtual void ProcessOverloadCandidates(Sema &S, unsigned CurrentArg,
609                                            OverloadCandidate *Candidates,
610                                            unsigned NumCandidates) {
611       StoredResults.reserve(StoredResults.size() + NumCandidates);
612       for (unsigned I = 0; I != NumCandidates; ++I) {
613         CodeCompletionString *StoredCompletion
614           = Candidates[I].CreateSignatureString(CurrentArg, S, getAllocator(),
615                                                 getCodeCompletionTUInfo());
616 
617         CXCompletionResult R;
618         R.CursorKind = CXCursor_NotImplemented;
619         R.CompletionString = StoredCompletion;
620         StoredResults.push_back(R);
621       }
622     }
623 
getAllocator()624     virtual CodeCompletionAllocator &getAllocator() {
625       return *AllocatedResults.CodeCompletionAllocator;
626     }
627 
getCodeCompletionTUInfo()628     virtual CodeCompletionTUInfo &getCodeCompletionTUInfo() { return CCTUInfo; }
629 
630   private:
Finish()631     void Finish() {
632       AllocatedResults.Results = new CXCompletionResult [StoredResults.size()];
633       AllocatedResults.NumResults = StoredResults.size();
634       std::memcpy(AllocatedResults.Results, StoredResults.data(),
635                   StoredResults.size() * sizeof(CXCompletionResult));
636       StoredResults.clear();
637     }
638   };
639 }
640 
641 extern "C" {
642 struct CodeCompleteAtInfo {
643   CXTranslationUnit TU;
644   const char *complete_filename;
645   unsigned complete_line;
646   unsigned complete_column;
647   struct CXUnsavedFile *unsaved_files;
648   unsigned num_unsaved_files;
649   unsigned options;
650   CXCodeCompleteResults *result;
651 };
clang_codeCompleteAt_Impl(void * UserData)652 void clang_codeCompleteAt_Impl(void *UserData) {
653   CodeCompleteAtInfo *CCAI = static_cast<CodeCompleteAtInfo*>(UserData);
654   CXTranslationUnit TU = CCAI->TU;
655   const char *complete_filename = CCAI->complete_filename;
656   unsigned complete_line = CCAI->complete_line;
657   unsigned complete_column = CCAI->complete_column;
658   struct CXUnsavedFile *unsaved_files = CCAI->unsaved_files;
659   unsigned num_unsaved_files = CCAI->num_unsaved_files;
660   unsigned options = CCAI->options;
661   CCAI->result = 0;
662 
663 #ifdef UDP_CODE_COMPLETION_LOGGER
664 #ifdef UDP_CODE_COMPLETION_LOGGER_PORT
665   const llvm::TimeRecord &StartTime =  llvm::TimeRecord::getCurrentTime();
666 #endif
667 #endif
668 
669   bool EnableLogging = getenv("LIBCLANG_CODE_COMPLETION_LOGGING") != 0;
670 
671   ASTUnit *AST = static_cast<ASTUnit *>(TU->TUData);
672   if (!AST)
673     return;
674 
675   CIndexer *CXXIdx = (CIndexer*)TU->CIdx;
676   if (CXXIdx->isOptEnabled(CXGlobalOpt_ThreadBackgroundPriorityForEditing))
677     setThreadBackgroundPriority();
678 
679   ASTUnit::ConcurrencyCheck Check(*AST);
680 
681   // Perform the remapping of source files.
682   SmallVector<ASTUnit::RemappedFile, 4> RemappedFiles;
683   for (unsigned I = 0; I != num_unsaved_files; ++I) {
684     StringRef Data(unsaved_files[I].Contents, unsaved_files[I].Length);
685     const llvm::MemoryBuffer *Buffer
686       = llvm::MemoryBuffer::getMemBufferCopy(Data, unsaved_files[I].Filename);
687     RemappedFiles.push_back(std::make_pair(unsaved_files[I].Filename,
688                                            Buffer));
689   }
690 
691   if (EnableLogging) {
692     // FIXME: Add logging.
693   }
694 
695   // Parse the resulting source file to find code-completion results.
696   AllocatedCXCodeCompleteResults *Results =
697         new AllocatedCXCodeCompleteResults(AST->getFileSystemOpts());
698   Results->Results = 0;
699   Results->NumResults = 0;
700 
701   // Create a code-completion consumer to capture the results.
702   CaptureCompletionResults Capture(*Results, &TU);
703 
704   // Perform completion.
705   AST->CodeComplete(complete_filename, complete_line, complete_column,
706                     RemappedFiles.data(), RemappedFiles.size(),
707                     (options & CXCodeComplete_IncludeMacros),
708                     (options & CXCodeComplete_IncludeCodePatterns),
709                     Capture,
710                     *Results->Diag, Results->LangOpts, *Results->SourceMgr,
711                     *Results->FileMgr, Results->Diagnostics,
712                     Results->TemporaryBuffers);
713 
714   // Keep a reference to the allocator used for cached global completions, so
715   // that we can be sure that the memory used by our code completion strings
716   // doesn't get freed due to subsequent reparses (while the code completion
717   // results are still active).
718   Results->CachedCompletionAllocator = AST->getCachedCompletionAllocator();
719 
720 
721 
722 #ifdef UDP_CODE_COMPLETION_LOGGER
723 #ifdef UDP_CODE_COMPLETION_LOGGER_PORT
724   const llvm::TimeRecord &EndTime =  llvm::TimeRecord::getCurrentTime();
725   SmallString<256> LogResult;
726   llvm::raw_svector_ostream os(LogResult);
727 
728   // Figure out the language and whether or not it uses PCH.
729   const char *lang = 0;
730   bool usesPCH = false;
731 
732   for (std::vector<const char*>::iterator I = argv.begin(), E = argv.end();
733        I != E; ++I) {
734     if (*I == 0)
735       continue;
736     if (strcmp(*I, "-x") == 0) {
737       if (I + 1 != E) {
738         lang = *(++I);
739         continue;
740       }
741     }
742     else if (strcmp(*I, "-include") == 0) {
743       if (I+1 != E) {
744         const char *arg = *(++I);
745         SmallString<512> pchName;
746         {
747           llvm::raw_svector_ostream os(pchName);
748           os << arg << ".pth";
749         }
750         pchName.push_back('\0');
751         struct stat stat_results;
752         if (stat(pchName.str().c_str(), &stat_results) == 0)
753           usesPCH = true;
754         continue;
755       }
756     }
757   }
758 
759   os << "{ ";
760   os << "\"wall\": " << (EndTime.getWallTime() - StartTime.getWallTime());
761   os << ", \"numRes\": " << Results->NumResults;
762   os << ", \"diags\": " << Results->Diagnostics.size();
763   os << ", \"pch\": " << (usesPCH ? "true" : "false");
764   os << ", \"lang\": \"" << (lang ? lang : "<unknown>") << '"';
765   const char *name = getlogin();
766   os << ", \"user\": \"" << (name ? name : "unknown") << '"';
767   os << ", \"clangVer\": \"" << getClangFullVersion() << '"';
768   os << " }";
769 
770   StringRef res = os.str();
771   if (res.size() > 0) {
772     do {
773       // Setup the UDP socket.
774       struct sockaddr_in servaddr;
775       bzero(&servaddr, sizeof(servaddr));
776       servaddr.sin_family = AF_INET;
777       servaddr.sin_port = htons(UDP_CODE_COMPLETION_LOGGER_PORT);
778       if (inet_pton(AF_INET, UDP_CODE_COMPLETION_LOGGER,
779                     &servaddr.sin_addr) <= 0)
780         break;
781 
782       int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
783       if (sockfd < 0)
784         break;
785 
786       sendto(sockfd, res.data(), res.size(), 0,
787              (struct sockaddr *)&servaddr, sizeof(servaddr));
788       close(sockfd);
789     }
790     while (false);
791   }
792 #endif
793 #endif
794   CCAI->result = Results;
795 }
clang_codeCompleteAt(CXTranslationUnit TU,const char * complete_filename,unsigned complete_line,unsigned complete_column,struct CXUnsavedFile * unsaved_files,unsigned num_unsaved_files,unsigned options)796 CXCodeCompleteResults *clang_codeCompleteAt(CXTranslationUnit TU,
797                                             const char *complete_filename,
798                                             unsigned complete_line,
799                                             unsigned complete_column,
800                                             struct CXUnsavedFile *unsaved_files,
801                                             unsigned num_unsaved_files,
802                                             unsigned options) {
803   CodeCompleteAtInfo CCAI = { TU, complete_filename, complete_line,
804                               complete_column, unsaved_files, num_unsaved_files,
805                               options, 0 };
806   llvm::CrashRecoveryContext CRC;
807 
808   if (!RunSafely(CRC, clang_codeCompleteAt_Impl, &CCAI)) {
809     fprintf(stderr, "libclang: crash detected in code completion\n");
810     static_cast<ASTUnit *>(TU->TUData)->setUnsafeToFree(true);
811     return 0;
812   } else if (getenv("LIBCLANG_RESOURCE_USAGE"))
813     PrintLibclangResourceUsage(TU);
814 
815   return CCAI.result;
816 }
817 
clang_defaultCodeCompleteOptions(void)818 unsigned clang_defaultCodeCompleteOptions(void) {
819   return CXCodeComplete_IncludeMacros;
820 }
821 
clang_disposeCodeCompleteResults(CXCodeCompleteResults * ResultsIn)822 void clang_disposeCodeCompleteResults(CXCodeCompleteResults *ResultsIn) {
823   if (!ResultsIn)
824     return;
825 
826   AllocatedCXCodeCompleteResults *Results
827     = static_cast<AllocatedCXCodeCompleteResults*>(ResultsIn);
828   delete Results;
829 }
830 
831 unsigned
clang_codeCompleteGetNumDiagnostics(CXCodeCompleteResults * ResultsIn)832 clang_codeCompleteGetNumDiagnostics(CXCodeCompleteResults *ResultsIn) {
833   AllocatedCXCodeCompleteResults *Results
834     = static_cast<AllocatedCXCodeCompleteResults*>(ResultsIn);
835   if (!Results)
836     return 0;
837 
838   return Results->Diagnostics.size();
839 }
840 
841 CXDiagnostic
clang_codeCompleteGetDiagnostic(CXCodeCompleteResults * ResultsIn,unsigned Index)842 clang_codeCompleteGetDiagnostic(CXCodeCompleteResults *ResultsIn,
843                                 unsigned Index) {
844   AllocatedCXCodeCompleteResults *Results
845     = static_cast<AllocatedCXCodeCompleteResults*>(ResultsIn);
846   if (!Results || Index >= Results->Diagnostics.size())
847     return 0;
848 
849   return new CXStoredDiagnostic(Results->Diagnostics[Index], Results->LangOpts);
850 }
851 
852 unsigned long long
clang_codeCompleteGetContexts(CXCodeCompleteResults * ResultsIn)853 clang_codeCompleteGetContexts(CXCodeCompleteResults *ResultsIn) {
854   AllocatedCXCodeCompleteResults *Results
855     = static_cast<AllocatedCXCodeCompleteResults*>(ResultsIn);
856   if (!Results)
857     return 0;
858 
859   return Results->Contexts;
860 }
861 
clang_codeCompleteGetContainerKind(CXCodeCompleteResults * ResultsIn,unsigned * IsIncomplete)862 enum CXCursorKind clang_codeCompleteGetContainerKind(
863                                                CXCodeCompleteResults *ResultsIn,
864                                                      unsigned *IsIncomplete) {
865   AllocatedCXCodeCompleteResults *Results =
866     static_cast<AllocatedCXCodeCompleteResults *>(ResultsIn);
867   if (!Results)
868     return CXCursor_InvalidCode;
869 
870   if (IsIncomplete != NULL) {
871     *IsIncomplete = Results->ContainerIsIncomplete;
872   }
873 
874   return Results->ContainerKind;
875 }
876 
clang_codeCompleteGetContainerUSR(CXCodeCompleteResults * ResultsIn)877 CXString clang_codeCompleteGetContainerUSR(CXCodeCompleteResults *ResultsIn) {
878   AllocatedCXCodeCompleteResults *Results =
879     static_cast<AllocatedCXCodeCompleteResults *>(ResultsIn);
880   if (!Results)
881     return createCXString("");
882 
883   return createCXString(clang_getCString(Results->ContainerUSR));
884 }
885 
886 
clang_codeCompleteGetObjCSelector(CXCodeCompleteResults * ResultsIn)887 CXString clang_codeCompleteGetObjCSelector(CXCodeCompleteResults *ResultsIn) {
888   AllocatedCXCodeCompleteResults *Results =
889     static_cast<AllocatedCXCodeCompleteResults *>(ResultsIn);
890   if (!Results)
891     return createCXString("");
892 
893   return createCXString(Results->Selector);
894 }
895 
896 } // end extern "C"
897 
898 /// \brief Simple utility function that appends a \p New string to the given
899 /// \p Old string, using the \p Buffer for storage.
900 ///
901 /// \param Old The string to which we are appending. This parameter will be
902 /// updated to reflect the complete string.
903 ///
904 ///
905 /// \param New The string to append to \p Old.
906 ///
907 /// \param Buffer A buffer that stores the actual, concatenated string. It will
908 /// be used if the old string is already-non-empty.
AppendToString(StringRef & Old,StringRef New,SmallString<256> & Buffer)909 static void AppendToString(StringRef &Old, StringRef New,
910                            SmallString<256> &Buffer) {
911   if (Old.empty()) {
912     Old = New;
913     return;
914   }
915 
916   if (Buffer.empty())
917     Buffer.append(Old.begin(), Old.end());
918   Buffer.append(New.begin(), New.end());
919   Old = Buffer.str();
920 }
921 
922 /// \brief Get the typed-text blocks from the given code-completion string
923 /// and return them as a single string.
924 ///
925 /// \param String The code-completion string whose typed-text blocks will be
926 /// concatenated.
927 ///
928 /// \param Buffer A buffer used for storage of the completed name.
GetTypedName(CodeCompletionString * String,SmallString<256> & Buffer)929 static StringRef GetTypedName(CodeCompletionString *String,
930                                     SmallString<256> &Buffer) {
931   StringRef Result;
932   for (CodeCompletionString::iterator C = String->begin(), CEnd = String->end();
933        C != CEnd; ++C) {
934     if (C->Kind == CodeCompletionString::CK_TypedText)
935       AppendToString(Result, C->Text, Buffer);
936   }
937 
938   return Result;
939 }
940 
941 namespace {
942   struct OrderCompletionResults {
operator ()__anon257689550211::OrderCompletionResults943     bool operator()(const CXCompletionResult &XR,
944                     const CXCompletionResult &YR) const {
945       CodeCompletionString *X
946         = (CodeCompletionString *)XR.CompletionString;
947       CodeCompletionString *Y
948         = (CodeCompletionString *)YR.CompletionString;
949 
950       SmallString<256> XBuffer;
951       StringRef XText = GetTypedName(X, XBuffer);
952       SmallString<256> YBuffer;
953       StringRef YText = GetTypedName(Y, YBuffer);
954 
955       if (XText.empty() || YText.empty())
956         return !XText.empty();
957 
958       int result = XText.compare_lower(YText);
959       if (result < 0)
960         return true;
961       if (result > 0)
962         return false;
963 
964       result = XText.compare(YText);
965       return result < 0;
966     }
967   };
968 }
969 
970 extern "C" {
clang_sortCodeCompletionResults(CXCompletionResult * Results,unsigned NumResults)971   void clang_sortCodeCompletionResults(CXCompletionResult *Results,
972                                        unsigned NumResults) {
973     std::stable_sort(Results, Results + NumResults, OrderCompletionResults());
974   }
975 }
976