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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 "CIndexDiagnostic.h"
     17 #include "CLog.h"
     18 #include "CXCursor.h"
     19 #include "CXString.h"
     20 #include "CXTranslationUnit.h"
     21 #include "clang/AST/Decl.h"
     22 #include "clang/AST/DeclObjC.h"
     23 #include "clang/AST/Type.h"
     24 #include "clang/Basic/FileManager.h"
     25 #include "clang/Basic/SourceManager.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 "clang/Sema/Sema.h"
     31 #include "llvm/ADT/SmallString.h"
     32 #include "llvm/ADT/StringExtras.h"
     33 #include "llvm/Support/CrashRecoveryContext.h"
     34 #include "llvm/Support/FileSystem.h"
     35 #include "llvm/Support/MemoryBuffer.h"
     36 #include "llvm/Support/Program.h"
     37 #include "llvm/Support/Timer.h"
     38 #include "llvm/Support/raw_ostream.h"
     39 #include <atomic>
     40 #include <cstdio>
     41 #include <cstdlib>
     42 #include <string>
     43 
     44 
     45 #ifdef UDP_CODE_COMPLETION_LOGGER
     46 #include "clang/Basic/Version.h"
     47 #include <arpa/inet.h>
     48 #include <sys/socket.h>
     49 #include <sys/types.h>
     50 #include <unistd.h>
     51 #endif
     52 
     53 using namespace clang;
     54 using namespace clang::cxindex;
     55 
     56 extern "C" {
     57 
     58 enum CXCompletionChunkKind
     59 clang_getCompletionChunkKind(CXCompletionString completion_string,
     60                              unsigned chunk_number) {
     61   CodeCompletionString *CCStr = (CodeCompletionString *)completion_string;
     62   if (!CCStr || chunk_number >= CCStr->size())
     63     return CXCompletionChunk_Text;
     64 
     65   switch ((*CCStr)[chunk_number].Kind) {
     66   case CodeCompletionString::CK_TypedText:
     67     return CXCompletionChunk_TypedText;
     68   case CodeCompletionString::CK_Text:
     69     return CXCompletionChunk_Text;
     70   case CodeCompletionString::CK_Optional:
     71     return CXCompletionChunk_Optional;
     72   case CodeCompletionString::CK_Placeholder:
     73     return CXCompletionChunk_Placeholder;
     74   case CodeCompletionString::CK_Informative:
     75     return CXCompletionChunk_Informative;
     76   case CodeCompletionString::CK_ResultType:
     77     return CXCompletionChunk_ResultType;
     78   case CodeCompletionString::CK_CurrentParameter:
     79     return CXCompletionChunk_CurrentParameter;
     80   case CodeCompletionString::CK_LeftParen:
     81     return CXCompletionChunk_LeftParen;
     82   case CodeCompletionString::CK_RightParen:
     83     return CXCompletionChunk_RightParen;
     84   case CodeCompletionString::CK_LeftBracket:
     85     return CXCompletionChunk_LeftBracket;
     86   case CodeCompletionString::CK_RightBracket:
     87     return CXCompletionChunk_RightBracket;
     88   case CodeCompletionString::CK_LeftBrace:
     89     return CXCompletionChunk_LeftBrace;
     90   case CodeCompletionString::CK_RightBrace:
     91     return CXCompletionChunk_RightBrace;
     92   case CodeCompletionString::CK_LeftAngle:
     93     return CXCompletionChunk_LeftAngle;
     94   case CodeCompletionString::CK_RightAngle:
     95     return CXCompletionChunk_RightAngle;
     96   case CodeCompletionString::CK_Comma:
     97     return CXCompletionChunk_Comma;
     98   case CodeCompletionString::CK_Colon:
     99     return CXCompletionChunk_Colon;
    100   case CodeCompletionString::CK_SemiColon:
    101     return CXCompletionChunk_SemiColon;
    102   case CodeCompletionString::CK_Equal:
    103     return CXCompletionChunk_Equal;
    104   case CodeCompletionString::CK_HorizontalSpace:
    105     return CXCompletionChunk_HorizontalSpace;
    106   case CodeCompletionString::CK_VerticalSpace:
    107     return CXCompletionChunk_VerticalSpace;
    108   }
    109 
    110   llvm_unreachable("Invalid CompletionKind!");
    111 }
    112 
    113 CXString clang_getCompletionChunkText(CXCompletionString completion_string,
    114                                       unsigned chunk_number) {
    115   CodeCompletionString *CCStr = (CodeCompletionString *)completion_string;
    116   if (!CCStr || chunk_number >= CCStr->size())
    117     return cxstring::createNull();
    118 
    119   switch ((*CCStr)[chunk_number].Kind) {
    120   case CodeCompletionString::CK_TypedText:
    121   case CodeCompletionString::CK_Text:
    122   case CodeCompletionString::CK_Placeholder:
    123   case CodeCompletionString::CK_CurrentParameter:
    124   case CodeCompletionString::CK_Informative:
    125   case CodeCompletionString::CK_LeftParen:
    126   case CodeCompletionString::CK_RightParen:
    127   case CodeCompletionString::CK_LeftBracket:
    128   case CodeCompletionString::CK_RightBracket:
    129   case CodeCompletionString::CK_LeftBrace:
    130   case CodeCompletionString::CK_RightBrace:
    131   case CodeCompletionString::CK_LeftAngle:
    132   case CodeCompletionString::CK_RightAngle:
    133   case CodeCompletionString::CK_Comma:
    134   case CodeCompletionString::CK_ResultType:
    135   case CodeCompletionString::CK_Colon:
    136   case CodeCompletionString::CK_SemiColon:
    137   case CodeCompletionString::CK_Equal:
    138   case CodeCompletionString::CK_HorizontalSpace:
    139   case CodeCompletionString::CK_VerticalSpace:
    140     return cxstring::createRef((*CCStr)[chunk_number].Text);
    141 
    142   case CodeCompletionString::CK_Optional:
    143     // Note: treated as an empty text block.
    144     return cxstring::createEmpty();
    145   }
    146 
    147   llvm_unreachable("Invalid CodeCompletionString Kind!");
    148 }
    149 
    150 
    151 CXCompletionString
    152 clang_getCompletionChunkCompletionString(CXCompletionString completion_string,
    153                                          unsigned chunk_number) {
    154   CodeCompletionString *CCStr = (CodeCompletionString *)completion_string;
    155   if (!CCStr || chunk_number >= CCStr->size())
    156     return nullptr;
    157 
    158   switch ((*CCStr)[chunk_number].Kind) {
    159   case CodeCompletionString::CK_TypedText:
    160   case CodeCompletionString::CK_Text:
    161   case CodeCompletionString::CK_Placeholder:
    162   case CodeCompletionString::CK_CurrentParameter:
    163   case CodeCompletionString::CK_Informative:
    164   case CodeCompletionString::CK_LeftParen:
    165   case CodeCompletionString::CK_RightParen:
    166   case CodeCompletionString::CK_LeftBracket:
    167   case CodeCompletionString::CK_RightBracket:
    168   case CodeCompletionString::CK_LeftBrace:
    169   case CodeCompletionString::CK_RightBrace:
    170   case CodeCompletionString::CK_LeftAngle:
    171   case CodeCompletionString::CK_RightAngle:
    172   case CodeCompletionString::CK_Comma:
    173   case CodeCompletionString::CK_ResultType:
    174   case CodeCompletionString::CK_Colon:
    175   case CodeCompletionString::CK_SemiColon:
    176   case CodeCompletionString::CK_Equal:
    177   case CodeCompletionString::CK_HorizontalSpace:
    178   case CodeCompletionString::CK_VerticalSpace:
    179     return nullptr;
    180 
    181   case CodeCompletionString::CK_Optional:
    182     // Note: treated as an empty text block.
    183     return (*CCStr)[chunk_number].Optional;
    184   }
    185 
    186   llvm_unreachable("Invalid CompletionKind!");
    187 }
    188 
    189 unsigned clang_getNumCompletionChunks(CXCompletionString completion_string) {
    190   CodeCompletionString *CCStr = (CodeCompletionString *)completion_string;
    191   return CCStr? CCStr->size() : 0;
    192 }
    193 
    194 unsigned clang_getCompletionPriority(CXCompletionString completion_string) {
    195   CodeCompletionString *CCStr = (CodeCompletionString *)completion_string;
    196   return CCStr? CCStr->getPriority() : unsigned(CCP_Unlikely);
    197 }
    198 
    199 enum CXAvailabilityKind
    200 clang_getCompletionAvailability(CXCompletionString completion_string) {
    201   CodeCompletionString *CCStr = (CodeCompletionString *)completion_string;
    202   return CCStr? static_cast<CXAvailabilityKind>(CCStr->getAvailability())
    203               : CXAvailability_Available;
    204 }
    205 
    206 unsigned clang_getCompletionNumAnnotations(CXCompletionString completion_string)
    207 {
    208   CodeCompletionString *CCStr = (CodeCompletionString *)completion_string;
    209   return CCStr ? CCStr->getAnnotationCount() : 0;
    210 }
    211 
    212 CXString clang_getCompletionAnnotation(CXCompletionString completion_string,
    213                                        unsigned annotation_number) {
    214   CodeCompletionString *CCStr = (CodeCompletionString *)completion_string;
    215   return CCStr ? cxstring::createRef(CCStr->getAnnotation(annotation_number))
    216                : cxstring::createNull();
    217 }
    218 
    219 CXString
    220 clang_getCompletionParent(CXCompletionString completion_string,
    221                           CXCursorKind *kind) {
    222   if (kind)
    223     *kind = CXCursor_NotImplemented;
    224 
    225   CodeCompletionString *CCStr = (CodeCompletionString *)completion_string;
    226   if (!CCStr)
    227     return cxstring::createNull();
    228 
    229   return cxstring::createRef(CCStr->getParentContextName());
    230 }
    231 
    232 CXString
    233 clang_getCompletionBriefComment(CXCompletionString completion_string) {
    234   CodeCompletionString *CCStr = (CodeCompletionString *)completion_string;
    235 
    236   if (!CCStr)
    237     return cxstring::createNull();
    238 
    239   return cxstring::createRef(CCStr->getBriefComment());
    240 }
    241 
    242 namespace {
    243 
    244 /// \brief The CXCodeCompleteResults structure we allocate internally;
    245 /// the client only sees the initial CXCodeCompleteResults structure.
    246 ///
    247 /// Normally, clients of CXString shouldn't care whether or not a CXString is
    248 /// managed by a pool or by explicitly malloc'ed memory.  But
    249 /// AllocatedCXCodeCompleteResults outlives the CXTranslationUnit, so we can
    250 /// not rely on the StringPool in the TU.
    251 struct AllocatedCXCodeCompleteResults : public CXCodeCompleteResults {
    252   AllocatedCXCodeCompleteResults(IntrusiveRefCntPtr<FileManager> FileMgr);
    253   ~AllocatedCXCodeCompleteResults();
    254 
    255   /// \brief Diagnostics produced while performing code completion.
    256   SmallVector<StoredDiagnostic, 8> Diagnostics;
    257 
    258   /// \brief Allocated API-exposed wrappters for Diagnostics.
    259   SmallVector<CXStoredDiagnostic *, 8> DiagnosticsWrappers;
    260 
    261   IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts;
    262 
    263   /// \brief Diag object
    264   IntrusiveRefCntPtr<DiagnosticsEngine> Diag;
    265 
    266   /// \brief Language options used to adjust source locations.
    267   LangOptions LangOpts;
    268 
    269   /// \brief File manager, used for diagnostics.
    270   IntrusiveRefCntPtr<FileManager> FileMgr;
    271 
    272   /// \brief Source manager, used for diagnostics.
    273   IntrusiveRefCntPtr<SourceManager> SourceMgr;
    274 
    275   /// \brief Temporary files that should be removed once we have finished
    276   /// with the code-completion results.
    277   std::vector<std::string> TemporaryFiles;
    278 
    279   /// \brief Temporary buffers that will be deleted once we have finished with
    280   /// the code-completion results.
    281   SmallVector<const llvm::MemoryBuffer *, 1> TemporaryBuffers;
    282 
    283   /// \brief Allocator used to store globally cached code-completion results.
    284   IntrusiveRefCntPtr<clang::GlobalCodeCompletionAllocator>
    285     CachedCompletionAllocator;
    286 
    287   /// \brief Allocator used to store code completion results.
    288   IntrusiveRefCntPtr<clang::GlobalCodeCompletionAllocator>
    289     CodeCompletionAllocator;
    290 
    291   /// \brief Context under which completion occurred.
    292   enum clang::CodeCompletionContext::Kind ContextKind;
    293 
    294   /// \brief A bitfield representing the acceptable completions for the
    295   /// current context.
    296   unsigned long long Contexts;
    297 
    298   /// \brief The kind of the container for the current context for completions.
    299   enum CXCursorKind ContainerKind;
    300 
    301   /// \brief The USR of the container for the current context for completions.
    302   std::string ContainerUSR;
    303 
    304   /// \brief a boolean value indicating whether there is complete information
    305   /// about the container
    306   unsigned ContainerIsIncomplete;
    307 
    308   /// \brief A string containing the Objective-C selector entered thus far for a
    309   /// message send.
    310   std::string Selector;
    311 };
    312 
    313 } // end anonymous namespace
    314 
    315 /// \brief Tracks the number of code-completion result objects that are
    316 /// currently active.
    317 ///
    318 /// Used for debugging purposes only.
    319 static std::atomic<unsigned> CodeCompletionResultObjects;
    320 
    321 AllocatedCXCodeCompleteResults::AllocatedCXCodeCompleteResults(
    322     IntrusiveRefCntPtr<FileManager> FileMgr)
    323     : CXCodeCompleteResults(),
    324       DiagOpts(new DiagnosticOptions),
    325       Diag(new DiagnosticsEngine(
    326           IntrusiveRefCntPtr<DiagnosticIDs>(new DiagnosticIDs), &*DiagOpts)),
    327       FileMgr(FileMgr), SourceMgr(new SourceManager(*Diag, *FileMgr)),
    328       CodeCompletionAllocator(new clang::GlobalCodeCompletionAllocator),
    329       Contexts(CXCompletionContext_Unknown),
    330       ContainerKind(CXCursor_InvalidCode), ContainerIsIncomplete(1) {
    331   if (getenv("LIBCLANG_OBJTRACKING"))
    332     fprintf(stderr, "+++ %u completion results\n",
    333             ++CodeCompletionResultObjects);
    334 }
    335 
    336 AllocatedCXCodeCompleteResults::~AllocatedCXCodeCompleteResults() {
    337   llvm::DeleteContainerPointers(DiagnosticsWrappers);
    338   delete [] Results;
    339 
    340   for (unsigned I = 0, N = TemporaryFiles.size(); I != N; ++I)
    341     llvm::sys::fs::remove(TemporaryFiles[I]);
    342   for (unsigned I = 0, N = TemporaryBuffers.size(); I != N; ++I)
    343     delete TemporaryBuffers[I];
    344 
    345   if (getenv("LIBCLANG_OBJTRACKING"))
    346     fprintf(stderr, "--- %u completion results\n",
    347             --CodeCompletionResultObjects);
    348 }
    349 
    350 } // end extern "C"
    351 
    352 static unsigned long long getContextsForContextKind(
    353                                           enum CodeCompletionContext::Kind kind,
    354                                                     Sema &S) {
    355   unsigned long long contexts = 0;
    356   switch (kind) {
    357     case CodeCompletionContext::CCC_OtherWithMacros: {
    358       //We can allow macros here, but we don't know what else is permissible
    359       //So we'll say the only thing permissible are macros
    360       contexts = CXCompletionContext_MacroName;
    361       break;
    362     }
    363     case CodeCompletionContext::CCC_TopLevel:
    364     case CodeCompletionContext::CCC_ObjCIvarList:
    365     case CodeCompletionContext::CCC_ClassStructUnion:
    366     case CodeCompletionContext::CCC_Type: {
    367       contexts = CXCompletionContext_AnyType |
    368                  CXCompletionContext_ObjCInterface;
    369       if (S.getLangOpts().CPlusPlus) {
    370         contexts |= CXCompletionContext_EnumTag |
    371                     CXCompletionContext_UnionTag |
    372                     CXCompletionContext_StructTag |
    373                     CXCompletionContext_ClassTag |
    374                     CXCompletionContext_NestedNameSpecifier;
    375       }
    376       break;
    377     }
    378     case CodeCompletionContext::CCC_Statement: {
    379       contexts = CXCompletionContext_AnyType |
    380                  CXCompletionContext_ObjCInterface |
    381                  CXCompletionContext_AnyValue;
    382       if (S.getLangOpts().CPlusPlus) {
    383         contexts |= CXCompletionContext_EnumTag |
    384                     CXCompletionContext_UnionTag |
    385                     CXCompletionContext_StructTag |
    386                     CXCompletionContext_ClassTag |
    387                     CXCompletionContext_NestedNameSpecifier;
    388       }
    389       break;
    390     }
    391     case CodeCompletionContext::CCC_Expression: {
    392       contexts = CXCompletionContext_AnyValue;
    393       if (S.getLangOpts().CPlusPlus) {
    394         contexts |= CXCompletionContext_AnyType |
    395                     CXCompletionContext_ObjCInterface |
    396                     CXCompletionContext_EnumTag |
    397                     CXCompletionContext_UnionTag |
    398                     CXCompletionContext_StructTag |
    399                     CXCompletionContext_ClassTag |
    400                     CXCompletionContext_NestedNameSpecifier;
    401       }
    402       break;
    403     }
    404     case CodeCompletionContext::CCC_ObjCMessageReceiver: {
    405       contexts = CXCompletionContext_ObjCObjectValue |
    406                  CXCompletionContext_ObjCSelectorValue |
    407                  CXCompletionContext_ObjCInterface;
    408       if (S.getLangOpts().CPlusPlus) {
    409         contexts |= CXCompletionContext_CXXClassTypeValue |
    410                     CXCompletionContext_AnyType |
    411                     CXCompletionContext_EnumTag |
    412                     CXCompletionContext_UnionTag |
    413                     CXCompletionContext_StructTag |
    414                     CXCompletionContext_ClassTag |
    415                     CXCompletionContext_NestedNameSpecifier;
    416       }
    417       break;
    418     }
    419     case CodeCompletionContext::CCC_DotMemberAccess: {
    420       contexts = CXCompletionContext_DotMemberAccess;
    421       break;
    422     }
    423     case CodeCompletionContext::CCC_ArrowMemberAccess: {
    424       contexts = CXCompletionContext_ArrowMemberAccess;
    425       break;
    426     }
    427     case CodeCompletionContext::CCC_ObjCPropertyAccess: {
    428       contexts = CXCompletionContext_ObjCPropertyAccess;
    429       break;
    430     }
    431     case CodeCompletionContext::CCC_EnumTag: {
    432       contexts = CXCompletionContext_EnumTag |
    433                  CXCompletionContext_NestedNameSpecifier;
    434       break;
    435     }
    436     case CodeCompletionContext::CCC_UnionTag: {
    437       contexts = CXCompletionContext_UnionTag |
    438                  CXCompletionContext_NestedNameSpecifier;
    439       break;
    440     }
    441     case CodeCompletionContext::CCC_ClassOrStructTag: {
    442       contexts = CXCompletionContext_StructTag |
    443                  CXCompletionContext_ClassTag |
    444                  CXCompletionContext_NestedNameSpecifier;
    445       break;
    446     }
    447     case CodeCompletionContext::CCC_ObjCProtocolName: {
    448       contexts = CXCompletionContext_ObjCProtocol;
    449       break;
    450     }
    451     case CodeCompletionContext::CCC_Namespace: {
    452       contexts = CXCompletionContext_Namespace;
    453       break;
    454     }
    455     case CodeCompletionContext::CCC_PotentiallyQualifiedName: {
    456       contexts = CXCompletionContext_NestedNameSpecifier;
    457       break;
    458     }
    459     case CodeCompletionContext::CCC_MacroNameUse: {
    460       contexts = CXCompletionContext_MacroName;
    461       break;
    462     }
    463     case CodeCompletionContext::CCC_NaturalLanguage: {
    464       contexts = CXCompletionContext_NaturalLanguage;
    465       break;
    466     }
    467     case CodeCompletionContext::CCC_SelectorName: {
    468       contexts = CXCompletionContext_ObjCSelectorName;
    469       break;
    470     }
    471     case CodeCompletionContext::CCC_ParenthesizedExpression: {
    472       contexts = CXCompletionContext_AnyType |
    473                  CXCompletionContext_ObjCInterface |
    474                  CXCompletionContext_AnyValue;
    475       if (S.getLangOpts().CPlusPlus) {
    476         contexts |= CXCompletionContext_EnumTag |
    477                     CXCompletionContext_UnionTag |
    478                     CXCompletionContext_StructTag |
    479                     CXCompletionContext_ClassTag |
    480                     CXCompletionContext_NestedNameSpecifier;
    481       }
    482       break;
    483     }
    484     case CodeCompletionContext::CCC_ObjCInstanceMessage: {
    485       contexts = CXCompletionContext_ObjCInstanceMessage;
    486       break;
    487     }
    488     case CodeCompletionContext::CCC_ObjCClassMessage: {
    489       contexts = CXCompletionContext_ObjCClassMessage;
    490       break;
    491     }
    492     case CodeCompletionContext::CCC_ObjCInterfaceName: {
    493       contexts = CXCompletionContext_ObjCInterface;
    494       break;
    495     }
    496     case CodeCompletionContext::CCC_ObjCCategoryName: {
    497       contexts = CXCompletionContext_ObjCCategory;
    498       break;
    499     }
    500     case CodeCompletionContext::CCC_Other:
    501     case CodeCompletionContext::CCC_ObjCInterface:
    502     case CodeCompletionContext::CCC_ObjCImplementation:
    503     case CodeCompletionContext::CCC_Name:
    504     case CodeCompletionContext::CCC_MacroName:
    505     case CodeCompletionContext::CCC_PreprocessorExpression:
    506     case CodeCompletionContext::CCC_PreprocessorDirective:
    507     case CodeCompletionContext::CCC_TypeQualifiers: {
    508       //Only Clang results should be accepted, so we'll set all of the other
    509       //context bits to 0 (i.e. the empty set)
    510       contexts = CXCompletionContext_Unexposed;
    511       break;
    512     }
    513     case CodeCompletionContext::CCC_Recovery: {
    514       //We don't know what the current context is, so we'll return unknown
    515       //This is the equivalent of setting all of the other context bits
    516       contexts = CXCompletionContext_Unknown;
    517       break;
    518     }
    519   }
    520   return contexts;
    521 }
    522 
    523 namespace {
    524   class CaptureCompletionResults : public CodeCompleteConsumer {
    525     AllocatedCXCodeCompleteResults &AllocatedResults;
    526     CodeCompletionTUInfo CCTUInfo;
    527     SmallVector<CXCompletionResult, 16> StoredResults;
    528     CXTranslationUnit *TU;
    529   public:
    530     CaptureCompletionResults(const CodeCompleteOptions &Opts,
    531                              AllocatedCXCodeCompleteResults &Results,
    532                              CXTranslationUnit *TranslationUnit)
    533       : CodeCompleteConsumer(Opts, false),
    534         AllocatedResults(Results), CCTUInfo(Results.CodeCompletionAllocator),
    535         TU(TranslationUnit) { }
    536     ~CaptureCompletionResults() override { Finish(); }
    537 
    538     void ProcessCodeCompleteResults(Sema &S,
    539                                     CodeCompletionContext Context,
    540                                     CodeCompletionResult *Results,
    541                                     unsigned NumResults) override {
    542       StoredResults.reserve(StoredResults.size() + NumResults);
    543       for (unsigned I = 0; I != NumResults; ++I) {
    544         CodeCompletionString *StoredCompletion
    545           = Results[I].CreateCodeCompletionString(S, Context, getAllocator(),
    546                                                   getCodeCompletionTUInfo(),
    547                                                   includeBriefComments());
    548 
    549         CXCompletionResult R;
    550         R.CursorKind = Results[I].CursorKind;
    551         R.CompletionString = StoredCompletion;
    552         StoredResults.push_back(R);
    553       }
    554 
    555       enum CodeCompletionContext::Kind contextKind = Context.getKind();
    556 
    557       AllocatedResults.ContextKind = contextKind;
    558       AllocatedResults.Contexts = getContextsForContextKind(contextKind, S);
    559 
    560       AllocatedResults.Selector = "";
    561       ArrayRef<IdentifierInfo *> SelIdents = Context.getSelIdents();
    562       for (ArrayRef<IdentifierInfo *>::iterator I = SelIdents.begin(),
    563                                                 E = SelIdents.end();
    564            I != E; ++I) {
    565         if (IdentifierInfo *selIdent = *I)
    566           AllocatedResults.Selector += selIdent->getName();
    567         AllocatedResults.Selector += ":";
    568       }
    569 
    570       QualType baseType = Context.getBaseType();
    571       NamedDecl *D = nullptr;
    572 
    573       if (!baseType.isNull()) {
    574         // Get the declaration for a class/struct/union/enum type
    575         if (const TagType *Tag = baseType->getAs<TagType>())
    576           D = Tag->getDecl();
    577         // Get the @interface declaration for a (possibly-qualified) Objective-C
    578         // object pointer type, e.g., NSString*
    579         else if (const ObjCObjectPointerType *ObjPtr =
    580                  baseType->getAs<ObjCObjectPointerType>())
    581           D = ObjPtr->getInterfaceDecl();
    582         // Get the @interface declaration for an Objective-C object type
    583         else if (const ObjCObjectType *Obj = baseType->getAs<ObjCObjectType>())
    584           D = Obj->getInterface();
    585         // Get the class for a C++ injected-class-name
    586         else if (const InjectedClassNameType *Injected =
    587                  baseType->getAs<InjectedClassNameType>())
    588           D = Injected->getDecl();
    589       }
    590 
    591       if (D != nullptr) {
    592         CXCursor cursor = cxcursor::MakeCXCursor(D, *TU);
    593 
    594         AllocatedResults.ContainerKind = clang_getCursorKind(cursor);
    595 
    596         CXString CursorUSR = clang_getCursorUSR(cursor);
    597         AllocatedResults.ContainerUSR = clang_getCString(CursorUSR);
    598         clang_disposeString(CursorUSR);
    599 
    600         const Type *type = baseType.getTypePtrOrNull();
    601         if (type) {
    602           AllocatedResults.ContainerIsIncomplete = type->isIncompleteType();
    603         }
    604         else {
    605           AllocatedResults.ContainerIsIncomplete = 1;
    606         }
    607       }
    608       else {
    609         AllocatedResults.ContainerKind = CXCursor_InvalidCode;
    610         AllocatedResults.ContainerUSR.clear();
    611         AllocatedResults.ContainerIsIncomplete = 1;
    612       }
    613     }
    614 
    615     void ProcessOverloadCandidates(Sema &S, unsigned CurrentArg,
    616                                    OverloadCandidate *Candidates,
    617                                    unsigned NumCandidates) override {
    618       StoredResults.reserve(StoredResults.size() + NumCandidates);
    619       for (unsigned I = 0; I != NumCandidates; ++I) {
    620         CodeCompletionString *StoredCompletion
    621           = Candidates[I].CreateSignatureString(CurrentArg, S, getAllocator(),
    622                                                 getCodeCompletionTUInfo(),
    623                                                 includeBriefComments());
    624 
    625         CXCompletionResult R;
    626         R.CursorKind = CXCursor_OverloadCandidate;
    627         R.CompletionString = StoredCompletion;
    628         StoredResults.push_back(R);
    629       }
    630     }
    631 
    632     CodeCompletionAllocator &getAllocator() override {
    633       return *AllocatedResults.CodeCompletionAllocator;
    634     }
    635 
    636     CodeCompletionTUInfo &getCodeCompletionTUInfo() override { return CCTUInfo;}
    637 
    638   private:
    639     void Finish() {
    640       AllocatedResults.Results = new CXCompletionResult [StoredResults.size()];
    641       AllocatedResults.NumResults = StoredResults.size();
    642       std::memcpy(AllocatedResults.Results, StoredResults.data(),
    643                   StoredResults.size() * sizeof(CXCompletionResult));
    644       StoredResults.clear();
    645     }
    646   };
    647 }
    648 
    649 static CXCodeCompleteResults *
    650 clang_codeCompleteAt_Impl(CXTranslationUnit TU, const char *complete_filename,
    651                           unsigned complete_line, unsigned complete_column,
    652                           ArrayRef<CXUnsavedFile> unsaved_files,
    653                           unsigned options) {
    654   bool IncludeBriefComments = options & CXCodeComplete_IncludeBriefComments;
    655 
    656 #ifdef UDP_CODE_COMPLETION_LOGGER
    657 #ifdef UDP_CODE_COMPLETION_LOGGER_PORT
    658   const llvm::TimeRecord &StartTime =  llvm::TimeRecord::getCurrentTime();
    659 #endif
    660 #endif
    661 
    662   bool EnableLogging = getenv("LIBCLANG_CODE_COMPLETION_LOGGING") != nullptr;
    663 
    664   if (cxtu::isNotUsableTU(TU)) {
    665     LOG_BAD_TU(TU);
    666     return nullptr;
    667   }
    668 
    669   ASTUnit *AST = cxtu::getASTUnit(TU);
    670   if (!AST)
    671     return nullptr;
    672 
    673   CIndexer *CXXIdx = TU->CIdx;
    674   if (CXXIdx->isOptEnabled(CXGlobalOpt_ThreadBackgroundPriorityForEditing))
    675     setThreadBackgroundPriority();
    676 
    677   ASTUnit::ConcurrencyCheck Check(*AST);
    678 
    679   // Perform the remapping of source files.
    680   SmallVector<ASTUnit::RemappedFile, 4> RemappedFiles;
    681 
    682   for (auto &UF : unsaved_files) {
    683     std::unique_ptr<llvm::MemoryBuffer> MB =
    684         llvm::MemoryBuffer::getMemBufferCopy(getContents(UF), UF.Filename);
    685     RemappedFiles.push_back(std::make_pair(UF.Filename, MB.release()));
    686   }
    687 
    688   if (EnableLogging) {
    689     // FIXME: Add logging.
    690   }
    691 
    692   // Parse the resulting source file to find code-completion results.
    693   AllocatedCXCodeCompleteResults *Results = new AllocatedCXCodeCompleteResults(
    694       &AST->getFileManager());
    695   Results->Results = nullptr;
    696   Results->NumResults = 0;
    697 
    698   // Create a code-completion consumer to capture the results.
    699   CodeCompleteOptions Opts;
    700   Opts.IncludeBriefComments = IncludeBriefComments;
    701   CaptureCompletionResults Capture(Opts, *Results, &TU);
    702 
    703   // Perform completion.
    704   AST->CodeComplete(complete_filename, complete_line, complete_column,
    705                     RemappedFiles, (options & CXCodeComplete_IncludeMacros),
    706                     (options & CXCodeComplete_IncludeCodePatterns),
    707                     IncludeBriefComments, Capture,
    708                     CXXIdx->getPCHContainerOperations(), *Results->Diag,
    709                     Results->LangOpts, *Results->SourceMgr, *Results->FileMgr,
    710                     Results->Diagnostics, Results->TemporaryBuffers);
    711 
    712   Results->DiagnosticsWrappers.resize(Results->Diagnostics.size());
    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   return Results;
    795 }
    796 
    797 extern "C" {
    798 CXCodeCompleteResults *clang_codeCompleteAt(CXTranslationUnit TU,
    799                                             const char *complete_filename,
    800                                             unsigned complete_line,
    801                                             unsigned complete_column,
    802                                             struct CXUnsavedFile *unsaved_files,
    803                                             unsigned num_unsaved_files,
    804                                             unsigned options) {
    805   LOG_FUNC_SECTION {
    806     *Log << TU << ' '
    807          << complete_filename << ':' << complete_line << ':' << complete_column;
    808   }
    809 
    810   if (num_unsaved_files && !unsaved_files)
    811     return nullptr;
    812 
    813   CXCodeCompleteResults *result;
    814   auto CodeCompleteAtImpl = [=, &result]() {
    815     result = clang_codeCompleteAt_Impl(
    816         TU, complete_filename, complete_line, complete_column,
    817         llvm::makeArrayRef(unsaved_files, num_unsaved_files), options);
    818   };
    819 
    820   if (getenv("LIBCLANG_NOTHREADS")) {
    821     CodeCompleteAtImpl();
    822     return result;
    823   }
    824 
    825   llvm::CrashRecoveryContext CRC;
    826 
    827   if (!RunSafely(CRC, CodeCompleteAtImpl)) {
    828     fprintf(stderr, "libclang: crash detected in code completion\n");
    829     cxtu::getASTUnit(TU)->setUnsafeToFree(true);
    830     return nullptr;
    831   } else if (getenv("LIBCLANG_RESOURCE_USAGE"))
    832     PrintLibclangResourceUsage(TU);
    833 
    834   return result;
    835 }
    836 
    837 unsigned clang_defaultCodeCompleteOptions(void) {
    838   return CXCodeComplete_IncludeMacros;
    839 }
    840 
    841 void clang_disposeCodeCompleteResults(CXCodeCompleteResults *ResultsIn) {
    842   if (!ResultsIn)
    843     return;
    844 
    845   AllocatedCXCodeCompleteResults *Results
    846     = static_cast<AllocatedCXCodeCompleteResults*>(ResultsIn);
    847   delete Results;
    848 }
    849 
    850 unsigned
    851 clang_codeCompleteGetNumDiagnostics(CXCodeCompleteResults *ResultsIn) {
    852   AllocatedCXCodeCompleteResults *Results
    853     = static_cast<AllocatedCXCodeCompleteResults*>(ResultsIn);
    854   if (!Results)
    855     return 0;
    856 
    857   return Results->Diagnostics.size();
    858 }
    859 
    860 CXDiagnostic
    861 clang_codeCompleteGetDiagnostic(CXCodeCompleteResults *ResultsIn,
    862                                 unsigned Index) {
    863   AllocatedCXCodeCompleteResults *Results
    864     = static_cast<AllocatedCXCodeCompleteResults*>(ResultsIn);
    865   if (!Results || Index >= Results->Diagnostics.size())
    866     return nullptr;
    867 
    868   CXStoredDiagnostic *Diag = Results->DiagnosticsWrappers[Index];
    869   if (!Diag)
    870     Results->DiagnosticsWrappers[Index] = Diag =
    871         new CXStoredDiagnostic(Results->Diagnostics[Index], Results->LangOpts);
    872   return Diag;
    873 }
    874 
    875 unsigned long long
    876 clang_codeCompleteGetContexts(CXCodeCompleteResults *ResultsIn) {
    877   AllocatedCXCodeCompleteResults *Results
    878     = static_cast<AllocatedCXCodeCompleteResults*>(ResultsIn);
    879   if (!Results)
    880     return 0;
    881 
    882   return Results->Contexts;
    883 }
    884 
    885 enum CXCursorKind clang_codeCompleteGetContainerKind(
    886                                                CXCodeCompleteResults *ResultsIn,
    887                                                      unsigned *IsIncomplete) {
    888   AllocatedCXCodeCompleteResults *Results =
    889     static_cast<AllocatedCXCodeCompleteResults *>(ResultsIn);
    890   if (!Results)
    891     return CXCursor_InvalidCode;
    892 
    893   if (IsIncomplete != nullptr) {
    894     *IsIncomplete = Results->ContainerIsIncomplete;
    895   }
    896 
    897   return Results->ContainerKind;
    898 }
    899 
    900 CXString clang_codeCompleteGetContainerUSR(CXCodeCompleteResults *ResultsIn) {
    901   AllocatedCXCodeCompleteResults *Results =
    902     static_cast<AllocatedCXCodeCompleteResults *>(ResultsIn);
    903   if (!Results)
    904     return cxstring::createEmpty();
    905 
    906   return cxstring::createRef(Results->ContainerUSR.c_str());
    907 }
    908 
    909 
    910 CXString clang_codeCompleteGetObjCSelector(CXCodeCompleteResults *ResultsIn) {
    911   AllocatedCXCodeCompleteResults *Results =
    912     static_cast<AllocatedCXCodeCompleteResults *>(ResultsIn);
    913   if (!Results)
    914     return cxstring::createEmpty();
    915 
    916   return cxstring::createDup(Results->Selector);
    917 }
    918 
    919 } // end extern "C"
    920 
    921 /// \brief Simple utility function that appends a \p New string to the given
    922 /// \p Old string, using the \p Buffer for storage.
    923 ///
    924 /// \param Old The string to which we are appending. This parameter will be
    925 /// updated to reflect the complete string.
    926 ///
    927 ///
    928 /// \param New The string to append to \p Old.
    929 ///
    930 /// \param Buffer A buffer that stores the actual, concatenated string. It will
    931 /// be used if the old string is already-non-empty.
    932 static void AppendToString(StringRef &Old, StringRef New,
    933                            SmallString<256> &Buffer) {
    934   if (Old.empty()) {
    935     Old = New;
    936     return;
    937   }
    938 
    939   if (Buffer.empty())
    940     Buffer.append(Old.begin(), Old.end());
    941   Buffer.append(New.begin(), New.end());
    942   Old = Buffer.str();
    943 }
    944 
    945 /// \brief Get the typed-text blocks from the given code-completion string
    946 /// and return them as a single string.
    947 ///
    948 /// \param String The code-completion string whose typed-text blocks will be
    949 /// concatenated.
    950 ///
    951 /// \param Buffer A buffer used for storage of the completed name.
    952 static StringRef GetTypedName(CodeCompletionString *String,
    953                                     SmallString<256> &Buffer) {
    954   StringRef Result;
    955   for (CodeCompletionString::iterator C = String->begin(), CEnd = String->end();
    956        C != CEnd; ++C) {
    957     if (C->Kind == CodeCompletionString::CK_TypedText)
    958       AppendToString(Result, C->Text, Buffer);
    959   }
    960 
    961   return Result;
    962 }
    963 
    964 namespace {
    965   struct OrderCompletionResults {
    966     bool operator()(const CXCompletionResult &XR,
    967                     const CXCompletionResult &YR) const {
    968       CodeCompletionString *X
    969         = (CodeCompletionString *)XR.CompletionString;
    970       CodeCompletionString *Y
    971         = (CodeCompletionString *)YR.CompletionString;
    972 
    973       SmallString<256> XBuffer;
    974       StringRef XText = GetTypedName(X, XBuffer);
    975       SmallString<256> YBuffer;
    976       StringRef YText = GetTypedName(Y, YBuffer);
    977 
    978       if (XText.empty() || YText.empty())
    979         return !XText.empty();
    980 
    981       int result = XText.compare_lower(YText);
    982       if (result < 0)
    983         return true;
    984       if (result > 0)
    985         return false;
    986 
    987       result = XText.compare(YText);
    988       return result < 0;
    989     }
    990   };
    991 }
    992 
    993 extern "C" {
    994   void clang_sortCodeCompletionResults(CXCompletionResult *Results,
    995                                        unsigned NumResults) {
    996     std::stable_sort(Results, Results + NumResults, OrderCompletionResults());
    997   }
    998 }
    999