CIndexCodeCompletion.cpp revision 1e5e6684b0f27701e6f7c65f8c6a32a10cbcc3ed 
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 "clang/Basic/SourceManager.h"
18#include "clang/Basic/FileManager.h"
19#include "clang/Frontend/ASTUnit.h"
20#include "clang/Frontend/CompilerInstance.h"
21#include "clang/Frontend/FrontendDiagnostic.h"
22#include "clang/Sema/CodeCompleteConsumer.h"
23#include "llvm/ADT/SmallString.h"
24#include "llvm/ADT/StringExtras.h"
25#include "llvm/Support/CrashRecoveryContext.h"
26#include "llvm/Support/MemoryBuffer.h"
27#include "llvm/Support/Timer.h"
28#include "llvm/Support/raw_ostream.h"
29#include "llvm/System/Program.h"
30#include <cstdlib>
31#include <cstdio>
32
33
34#ifdef UDP_CODE_COMPLETION_LOGGER
35#include "clang/Basic/Version.h"
36#include <arpa/inet.h>
37#include <sys/socket.h>
38#include <sys/types.h>
39#include <unistd.h>
40#endif
41
42using namespace clang;
43using namespace clang::cxstring;
44
45namespace {
46  /// \brief Stored representation of a completion string.
47  ///
48  /// This is the representation behind a CXCompletionString.
49  class CXStoredCodeCompletionString : public CodeCompletionString {
50    unsigned Priority;
51    CXAvailabilityKind Availability;
52
53  public:
54    CXStoredCodeCompletionString(unsigned Priority,
55                                 CXAvailabilityKind Availability)
56      : Priority(Priority), Availability(Availability) { }
57
58    unsigned getPriority() const { return Priority; }
59    CXAvailabilityKind getAvailability() const { return Availability; }
60  };
61}
62
63extern "C" {
64
65enum CXCompletionChunkKind
66clang_getCompletionChunkKind(CXCompletionString completion_string,
67                             unsigned chunk_number) {
68  CXStoredCodeCompletionString *CCStr
69    = (CXStoredCodeCompletionString *)completion_string;
70  if (!CCStr || chunk_number >= CCStr->size())
71    return CXCompletionChunk_Text;
72
73  switch ((*CCStr)[chunk_number].Kind) {
74  case CodeCompletionString::CK_TypedText:
75    return CXCompletionChunk_TypedText;
76  case CodeCompletionString::CK_Text:
77    return CXCompletionChunk_Text;
78  case CodeCompletionString::CK_Optional:
79    return CXCompletionChunk_Optional;
80  case CodeCompletionString::CK_Placeholder:
81    return CXCompletionChunk_Placeholder;
82  case CodeCompletionString::CK_Informative:
83    return CXCompletionChunk_Informative;
84  case CodeCompletionString::CK_ResultType:
85    return CXCompletionChunk_ResultType;
86  case CodeCompletionString::CK_CurrentParameter:
87    return CXCompletionChunk_CurrentParameter;
88  case CodeCompletionString::CK_LeftParen:
89    return CXCompletionChunk_LeftParen;
90  case CodeCompletionString::CK_RightParen:
91    return CXCompletionChunk_RightParen;
92  case CodeCompletionString::CK_LeftBracket:
93    return CXCompletionChunk_LeftBracket;
94  case CodeCompletionString::CK_RightBracket:
95    return CXCompletionChunk_RightBracket;
96  case CodeCompletionString::CK_LeftBrace:
97    return CXCompletionChunk_LeftBrace;
98  case CodeCompletionString::CK_RightBrace:
99    return CXCompletionChunk_RightBrace;
100  case CodeCompletionString::CK_LeftAngle:
101    return CXCompletionChunk_LeftAngle;
102  case CodeCompletionString::CK_RightAngle:
103    return CXCompletionChunk_RightAngle;
104  case CodeCompletionString::CK_Comma:
105    return CXCompletionChunk_Comma;
106  case CodeCompletionString::CK_Colon:
107    return CXCompletionChunk_Colon;
108  case CodeCompletionString::CK_SemiColon:
109    return CXCompletionChunk_SemiColon;
110  case CodeCompletionString::CK_Equal:
111    return CXCompletionChunk_Equal;
112  case CodeCompletionString::CK_HorizontalSpace:
113    return CXCompletionChunk_HorizontalSpace;
114  case CodeCompletionString::CK_VerticalSpace:
115    return CXCompletionChunk_VerticalSpace;
116  }
117
118  // Should be unreachable, but let's be careful.
119  return CXCompletionChunk_Text;
120}
121
122CXString clang_getCompletionChunkText(CXCompletionString completion_string,
123                                      unsigned chunk_number) {
124  CXStoredCodeCompletionString *CCStr
125    = (CXStoredCodeCompletionString *)completion_string;
126  if (!CCStr || chunk_number >= CCStr->size())
127    return createCXString(0);
128
129  switch ((*CCStr)[chunk_number].Kind) {
130  case CodeCompletionString::CK_TypedText:
131  case CodeCompletionString::CK_Text:
132  case CodeCompletionString::CK_Placeholder:
133  case CodeCompletionString::CK_CurrentParameter:
134  case CodeCompletionString::CK_Informative:
135  case CodeCompletionString::CK_LeftParen:
136  case CodeCompletionString::CK_RightParen:
137  case CodeCompletionString::CK_LeftBracket:
138  case CodeCompletionString::CK_RightBracket:
139  case CodeCompletionString::CK_LeftBrace:
140  case CodeCompletionString::CK_RightBrace:
141  case CodeCompletionString::CK_LeftAngle:
142  case CodeCompletionString::CK_RightAngle:
143  case CodeCompletionString::CK_Comma:
144  case CodeCompletionString::CK_ResultType:
145  case CodeCompletionString::CK_Colon:
146  case CodeCompletionString::CK_SemiColon:
147  case CodeCompletionString::CK_Equal:
148  case CodeCompletionString::CK_HorizontalSpace:
149    return createCXString((*CCStr)[chunk_number].Text, false);
150
151  case CodeCompletionString::CK_VerticalSpace:
152    // FIXME: Temporary hack until we figure out how to handle vertical space.
153    return createCXString(" ");
154
155  case CodeCompletionString::CK_Optional:
156    // Note: treated as an empty text block.
157    return createCXString("");
158  }
159
160  // Should be unreachable, but let's be careful.
161  return createCXString(0);
162}
163
164
165CXCompletionString
166clang_getCompletionChunkCompletionString(CXCompletionString completion_string,
167                                         unsigned chunk_number) {
168  CXStoredCodeCompletionString *CCStr
169    = (CXStoredCodeCompletionString *)completion_string;
170  if (!CCStr || chunk_number >= CCStr->size())
171    return 0;
172
173  switch ((*CCStr)[chunk_number].Kind) {
174  case CodeCompletionString::CK_TypedText:
175  case CodeCompletionString::CK_Text:
176  case CodeCompletionString::CK_Placeholder:
177  case CodeCompletionString::CK_CurrentParameter:
178  case CodeCompletionString::CK_Informative:
179  case CodeCompletionString::CK_LeftParen:
180  case CodeCompletionString::CK_RightParen:
181  case CodeCompletionString::CK_LeftBracket:
182  case CodeCompletionString::CK_RightBracket:
183  case CodeCompletionString::CK_LeftBrace:
184  case CodeCompletionString::CK_RightBrace:
185  case CodeCompletionString::CK_LeftAngle:
186  case CodeCompletionString::CK_RightAngle:
187  case CodeCompletionString::CK_Comma:
188  case CodeCompletionString::CK_ResultType:
189  case CodeCompletionString::CK_Colon:
190  case CodeCompletionString::CK_SemiColon:
191  case CodeCompletionString::CK_Equal:
192  case CodeCompletionString::CK_HorizontalSpace:
193  case CodeCompletionString::CK_VerticalSpace:
194    return 0;
195
196  case CodeCompletionString::CK_Optional:
197    // Note: treated as an empty text block.
198    return (*CCStr)[chunk_number].Optional;
199  }
200
201  // Should be unreachable, but let's be careful.
202  return 0;
203}
204
205unsigned clang_getNumCompletionChunks(CXCompletionString completion_string) {
206  CXStoredCodeCompletionString *CCStr
207    = (CXStoredCodeCompletionString *)completion_string;
208  return CCStr? CCStr->size() : 0;
209}
210
211unsigned clang_getCompletionPriority(CXCompletionString completion_string) {
212  CXStoredCodeCompletionString *CCStr
213    = (CXStoredCodeCompletionString *)completion_string;
214  return CCStr? CCStr->getPriority() : unsigned(CCP_Unlikely);
215}
216
217enum CXAvailabilityKind
218clang_getCompletionAvailability(CXCompletionString completion_string) {
219  CXStoredCodeCompletionString *CCStr
220    = (CXStoredCodeCompletionString *)completion_string;
221  return CCStr? CCStr->getAvailability() : CXAvailability_Available;
222}
223
224static bool ReadUnsigned(const char *&Memory, const char *MemoryEnd,
225                         unsigned &Value) {
226  if (Memory + sizeof(unsigned) > MemoryEnd)
227    return true;
228
229  memmove(&Value, Memory, sizeof(unsigned));
230  Memory += sizeof(unsigned);
231  return false;
232}
233
234/// \brief The CXCodeCompleteResults structure we allocate internally;
235/// the client only sees the initial CXCodeCompleteResults structure.
236struct AllocatedCXCodeCompleteResults : public CXCodeCompleteResults {
237  AllocatedCXCodeCompleteResults();
238  ~AllocatedCXCodeCompleteResults();
239
240  /// \brief Diagnostics produced while performing code completion.
241  llvm::SmallVector<StoredDiagnostic, 8> Diagnostics;
242
243  /// \brief Diag object
244  llvm::IntrusiveRefCntPtr<Diagnostic> Diag;
245
246  /// \brief Language options used to adjust source locations.
247  LangOptions LangOpts;
248
249  /// \brief Source manager, used for diagnostics.
250  SourceManager SourceMgr;
251
252  /// \brief File manager, used for diagnostics.
253  FileManager FileMgr;
254
255  /// \brief Temporary files that should be removed once we have finished
256  /// with the code-completion results.
257  std::vector<llvm::sys::Path> TemporaryFiles;
258
259  /// \brief Temporary buffers that will be deleted once we have finished with the code-completion results.
260  llvm::SmallVector<const llvm::MemoryBuffer *, 1> TemporaryBuffers;
261};
262
263AllocatedCXCodeCompleteResults::AllocatedCXCodeCompleteResults()
264  : CXCodeCompleteResults(), Diag(new Diagnostic), SourceMgr(*Diag) { }
265
266AllocatedCXCodeCompleteResults::~AllocatedCXCodeCompleteResults() {
267  for (unsigned I = 0, N = NumResults; I != N; ++I)
268    delete (CXStoredCodeCompletionString *)Results[I].CompletionString;
269  delete [] Results;
270
271  for (unsigned I = 0, N = TemporaryFiles.size(); I != N; ++I)
272    TemporaryFiles[I].eraseFromDisk();
273  for (unsigned I = 0, N = TemporaryBuffers.size(); I != N; ++I)
274    delete TemporaryBuffers[I];
275}
276
277CXCodeCompleteResults *clang_codeComplete(CXIndex CIdx,
278                                          const char *source_filename,
279                                          int num_command_line_args,
280                                          const char **command_line_args,
281                                          unsigned num_unsaved_files,
282                                          struct CXUnsavedFile *unsaved_files,
283                                          const char *complete_filename,
284                                          unsigned complete_line,
285                                          unsigned complete_column) {
286#ifdef UDP_CODE_COMPLETION_LOGGER
287#ifdef UDP_CODE_COMPLETION_LOGGER_PORT
288  const llvm::TimeRecord &StartTime =  llvm::TimeRecord::getCurrentTime();
289#endif
290#endif
291
292  bool EnableLogging = getenv("LIBCLANG_CODE_COMPLETION_LOGGING") != 0;
293
294  llvm::OwningPtr<llvm::NamedRegionTimer> CCTimer;
295  if (getenv("LIBCLANG_TIMING")) {
296    llvm::SmallString<128> TimerName;
297    llvm::raw_svector_ostream TimerNameOut(TimerName);
298    TimerNameOut << "Code completion (out-of-process) @ " << complete_filename
299      << ":" << complete_line << ":" << complete_column;
300    CCTimer.reset(new llvm::NamedRegionTimer(TimerNameOut.str()));
301  }
302
303  // The indexer, which is mainly used to determine where diagnostics go.
304  CIndexer *CXXIdx = static_cast<CIndexer *>(CIdx);
305
306  // Configure the diagnostics.
307  DiagnosticOptions DiagOpts;
308  llvm::IntrusiveRefCntPtr<Diagnostic> Diags;
309  Diags = CompilerInstance::createDiagnostics(DiagOpts, 0, 0);
310
311  // The set of temporary files that we've built.
312  std::vector<llvm::sys::Path> TemporaryFiles;
313
314  // Build up the arguments for invoking 'clang'.
315  std::vector<const char *> argv;
316
317  // First add the complete path to the 'clang' executable.
318  llvm::sys::Path ClangPath = CXXIdx->getClangPath();
319  argv.push_back(ClangPath.c_str());
320
321  // Always use Clang C++ support.
322  argv.push_back("-ccc-clang-cxx");
323
324  // Add the '-fsyntax-only' argument so that we only perform a basic
325  // syntax check of the code.
326  argv.push_back("-fsyntax-only");
327
328  // Add the appropriate '-code-completion-at=file:line:column' argument
329  // to perform code completion, with an "-Xclang" preceding it.
330  std::string code_complete_at;
331  code_complete_at += complete_filename;
332  code_complete_at += ":";
333  code_complete_at += llvm::utostr(complete_line);
334  code_complete_at += ":";
335  code_complete_at += llvm::utostr(complete_column);
336  argv.push_back("-Xclang");
337  argv.push_back("-code-completion-at");
338  argv.push_back("-Xclang");
339  argv.push_back(code_complete_at.c_str());
340  argv.push_back("-Xclang");
341  argv.push_back("-no-code-completion-debug-printer");
342  argv.push_back("-Xclang");
343  argv.push_back("-code-completion-macros");
344  argv.push_back("-fdiagnostics-binary");
345
346  // Remap any unsaved files to temporary files.
347  std::vector<std::string> RemapArgs;
348  if (RemapFiles(num_unsaved_files, unsaved_files, RemapArgs, TemporaryFiles))
349    return 0;
350
351  // The pointers into the elements of RemapArgs are stable because we
352  // won't be adding anything to RemapArgs after this point.
353  for (unsigned i = 0, e = RemapArgs.size(); i != e; ++i)
354    argv.push_back(RemapArgs[i].c_str());
355
356  // Add the source file name (FIXME: later, we'll want to build temporary
357  // file from the buffer, or just feed the source text via standard input).
358  if (source_filename)
359    argv.push_back(source_filename);
360
361  // Process the compiler options, stripping off '-o', '-c', '-fsyntax-only'.
362  for (int i = 0; i < num_command_line_args; ++i)
363    if (const char *arg = command_line_args[i]) {
364      if (strcmp(arg, "-o") == 0) {
365        ++i; // Also skip the matching argument.
366        continue;
367      }
368      if (strcmp(arg, "-emit-ast") == 0 ||
369          strcmp(arg, "-c") == 0 ||
370          strcmp(arg, "-fsyntax-only") == 0) {
371        continue;
372      }
373
374      // Keep the argument.
375      argv.push_back(arg);
376    }
377
378  if (EnableLogging) {
379    std::string Log = ClangPath.str();
380    for (unsigned I = 0, N = argv.size(); I != N; ++I) {
381      Log += ' ';
382      Log += argv[I];
383    }
384    fprintf(stderr, "libclang (Code Completion): %s\n", Log.c_str());
385  }
386
387  // Add the null terminator.
388  argv.push_back(NULL);
389
390  // Generate a temporary name for the code-completion results file.
391  char tmpFile[L_tmpnam];
392  char *tmpFileName = tmpnam(tmpFile);
393  llvm::sys::Path ResultsFile(tmpFileName);
394  TemporaryFiles.push_back(ResultsFile);
395
396  // Generate a temporary name for the diagnostics file.
397  char tmpFileResults[L_tmpnam];
398  char *tmpResultsFileName = tmpnam(tmpFileResults);
399  llvm::sys::Path DiagnosticsFile(tmpResultsFileName);
400  TemporaryFiles.push_back(DiagnosticsFile);
401
402
403
404  // Invoke 'clang'.
405  llvm::sys::Path DevNull; // leave empty, causes redirection to /dev/null
406                           // on Unix or NUL (Windows).
407  std::string ErrMsg;
408  const llvm::sys::Path *Redirects[] = { &DevNull, &ResultsFile,
409                                         &DiagnosticsFile, 0 };
410  llvm::sys::Program::ExecuteAndWait(ClangPath, &argv[0], /* env */ NULL,
411                                     /* redirects */ &Redirects[0],
412                                     /* secondsToWait */ 0,
413                                     /* memoryLimits */ 0, &ErrMsg);
414
415  if (!ErrMsg.empty()) {
416    std::string AllArgs;
417    for (std::vector<const char*>::iterator I = argv.begin(), E = argv.end();
418         I != E; ++I) {
419      AllArgs += ' ';
420      if (*I)
421        AllArgs += *I;
422    }
423
424    Diags->Report(diag::err_fe_invoking) << AllArgs << ErrMsg;
425  }
426
427  // Parse the resulting source file to find code-completion results.
428  using llvm::MemoryBuffer;
429  using llvm::StringRef;
430  AllocatedCXCodeCompleteResults *Results = new AllocatedCXCodeCompleteResults;
431  Results->Results = 0;
432  Results->NumResults = 0;
433  // FIXME: Set Results->LangOpts!
434  if (MemoryBuffer *F = MemoryBuffer::getFile(ResultsFile.c_str())) {
435    llvm::SmallVector<CXCompletionResult, 4> CompletionResults;
436    StringRef Buffer = F->getBuffer();
437    for (const char *Str = Buffer.data(), *StrEnd = Str + Buffer.size();
438         Str < StrEnd;) {
439      unsigned KindValue;
440      if (ReadUnsigned(Str, StrEnd, KindValue))
441        break;
442
443      unsigned Priority;
444      if (ReadUnsigned(Str, StrEnd, Priority))
445        break;
446
447      unsigned Availability;
448      if (ReadUnsigned(Str, StrEnd, Availability))
449        break;
450
451      CXStoredCodeCompletionString *CCStr
452        = new CXStoredCodeCompletionString(Priority,
453                                           (CXAvailabilityKind)Availability);
454      if (!CCStr->Deserialize(Str, StrEnd)) {
455        delete CCStr;
456        continue;
457      }
458
459      if (!CCStr->empty()) {
460        // Vend the code-completion result to the caller.
461        CXCompletionResult Result;
462        Result.CursorKind = (CXCursorKind)KindValue;
463        Result.CompletionString = CCStr;
464        CompletionResults.push_back(Result);
465      }
466    };
467
468    // Allocate the results.
469    Results->Results = new CXCompletionResult [CompletionResults.size()];
470    Results->NumResults = CompletionResults.size();
471    memcpy(Results->Results, CompletionResults.data(),
472           CompletionResults.size() * sizeof(CXCompletionResult));
473    Results->TemporaryBuffers.push_back(F);
474  }
475
476  LoadSerializedDiagnostics(DiagnosticsFile, num_unsaved_files, unsaved_files,
477                            Results->FileMgr, Results->SourceMgr,
478                            Results->Diagnostics);
479
480  // Make sure we delete temporary files when the code-completion results are
481  // destroyed.
482  Results->TemporaryFiles.swap(TemporaryFiles);
483
484#ifdef UDP_CODE_COMPLETION_LOGGER
485#ifdef UDP_CODE_COMPLETION_LOGGER_PORT
486  const llvm::TimeRecord &EndTime =  llvm::TimeRecord::getCurrentTime();
487  llvm::SmallString<256> LogResult;
488  llvm::raw_svector_ostream os(LogResult);
489
490  // Figure out the language and whether or not it uses PCH.
491  const char *lang = 0;
492  bool usesPCH = false;
493
494  for (std::vector<const char*>::iterator I = argv.begin(), E = argv.end();
495       I != E; ++I) {
496    if (*I == 0)
497      continue;
498    if (strcmp(*I, "-x") == 0) {
499      if (I + 1 != E) {
500        lang = *(++I);
501        continue;
502      }
503    }
504    else if (strcmp(*I, "-include") == 0) {
505      if (I+1 != E) {
506        const char *arg = *(++I);
507        llvm::SmallString<512> pchName;
508        {
509          llvm::raw_svector_ostream os(pchName);
510          os << arg << ".pth";
511        }
512        pchName.push_back('\0');
513        struct stat stat_results;
514        if (stat(pchName.data(), &stat_results) == 0)
515          usesPCH = true;
516        continue;
517      }
518    }
519  }
520
521  os << "{ ";
522  os << "\"wall\": " << (EndTime.getWallTime() - StartTime.getWallTime());
523  os << ", \"numRes\": " << Results->NumResults;
524  os << ", \"diags\": " << Results->Diagnostics.size();
525  os << ", \"pch\": " << (usesPCH ? "true" : "false");
526  os << ", \"lang\": \"" << (lang ? lang : "<unknown>") << '"';
527  const char *name = getlogin();
528  os << ", \"user\": \"" << (name ? name : "unknown") << '"';
529  os << ", \"clangVer\": \"" << getClangFullVersion() << '"';
530  os << " }";
531
532  llvm::StringRef res = os.str();
533  if (res.size() > 0) {
534    do {
535      // Setup the UDP socket.
536      struct sockaddr_in servaddr;
537      bzero(&servaddr, sizeof(servaddr));
538      servaddr.sin_family = AF_INET;
539      servaddr.sin_port = htons(UDP_CODE_COMPLETION_LOGGER_PORT);
540      if (inet_pton(AF_INET, UDP_CODE_COMPLETION_LOGGER,
541                    &servaddr.sin_addr) <= 0)
542        break;
543
544      int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
545      if (sockfd < 0)
546        break;
547
548      sendto(sockfd, res.data(), res.size(), 0,
549             (struct sockaddr *)&servaddr, sizeof(servaddr));
550      close(sockfd);
551    }
552    while (false);
553  }
554#endif
555#endif
556  return Results;
557}
558
559} // end extern "C"
560
561namespace {
562  class CaptureCompletionResults : public CodeCompleteConsumer {
563    AllocatedCXCodeCompleteResults &AllocatedResults;
564
565  public:
566    explicit CaptureCompletionResults(AllocatedCXCodeCompleteResults &Results)
567      : CodeCompleteConsumer(true, false, true, false),
568        AllocatedResults(Results) { }
569
570    virtual void ProcessCodeCompleteResults(Sema &S,
571                                            CodeCompletionContext Context,
572                                            CodeCompletionResult *Results,
573                                            unsigned NumResults) {
574      AllocatedResults.Results = new CXCompletionResult [NumResults];
575      AllocatedResults.NumResults = NumResults;
576      for (unsigned I = 0; I != NumResults; ++I) {
577        CXStoredCodeCompletionString *StoredCompletion
578          = new CXStoredCodeCompletionString(Results[I].Priority,
579                                             Results[I].Availability);
580        (void)Results[I].CreateCodeCompletionString(S, StoredCompletion);
581        AllocatedResults.Results[I].CursorKind = Results[I].CursorKind;
582        AllocatedResults.Results[I].CompletionString = StoredCompletion;
583      }
584    }
585
586    // FIXME: Add ProcessOverloadCandidates?
587  };
588}
589
590extern "C" {
591struct CodeCompleteAtInfo {
592  CXTranslationUnit TU;
593  const char *complete_filename;
594  unsigned complete_line;
595  unsigned complete_column;
596  struct CXUnsavedFile *unsaved_files;
597  unsigned num_unsaved_files;
598  unsigned options;
599  CXCodeCompleteResults *result;
600};
601void clang_codeCompleteAt_Impl(void *UserData) {
602  CodeCompleteAtInfo *CCAI = static_cast<CodeCompleteAtInfo*>(UserData);
603  CXTranslationUnit TU = CCAI->TU;
604  const char *complete_filename = CCAI->complete_filename;
605  unsigned complete_line = CCAI->complete_line;
606  unsigned complete_column = CCAI->complete_column;
607  struct CXUnsavedFile *unsaved_files = CCAI->unsaved_files;
608  unsigned num_unsaved_files = CCAI->num_unsaved_files;
609  unsigned options = CCAI->options;
610  CCAI->result = 0;
611
612#ifdef UDP_CODE_COMPLETION_LOGGER
613#ifdef UDP_CODE_COMPLETION_LOGGER_PORT
614  const llvm::TimeRecord &StartTime =  llvm::TimeRecord::getCurrentTime();
615#endif
616#endif
617
618  bool EnableLogging = getenv("LIBCLANG_CODE_COMPLETION_LOGGING") != 0;
619
620  ASTUnit *AST = static_cast<ASTUnit *>(TU);
621  if (!AST)
622    return;
623
624  // Perform the remapping of source files.
625  llvm::SmallVector<ASTUnit::RemappedFile, 4> RemappedFiles;
626  for (unsigned I = 0; I != num_unsaved_files; ++I) {
627    llvm::StringRef Data(unsaved_files[I].Contents, unsaved_files[I].Length);
628    const llvm::MemoryBuffer *Buffer
629      = llvm::MemoryBuffer::getMemBufferCopy(Data, unsaved_files[I].Filename);
630    RemappedFiles.push_back(std::make_pair(unsaved_files[I].Filename,
631                                           Buffer));
632  }
633
634  if (EnableLogging) {
635    // FIXME: Add logging.
636  }
637
638  // Parse the resulting source file to find code-completion results.
639  AllocatedCXCodeCompleteResults *Results = new AllocatedCXCodeCompleteResults;
640  Results->Results = 0;
641  Results->NumResults = 0;
642
643  // Create a code-completion consumer to capture the results.
644  CaptureCompletionResults Capture(*Results);
645
646  // Perform completion.
647  AST->CodeComplete(complete_filename, complete_line, complete_column,
648                    RemappedFiles.data(), RemappedFiles.size(),
649                    (options & CXCodeComplete_IncludeMacros),
650                    (options & CXCodeComplete_IncludeCodePatterns),
651                    Capture,
652                    *Results->Diag, Results->LangOpts, Results->SourceMgr,
653                    Results->FileMgr, Results->Diagnostics,
654                    Results->TemporaryBuffers);
655
656
657
658#ifdef UDP_CODE_COMPLETION_LOGGER
659#ifdef UDP_CODE_COMPLETION_LOGGER_PORT
660  const llvm::TimeRecord &EndTime =  llvm::TimeRecord::getCurrentTime();
661  llvm::SmallString<256> LogResult;
662  llvm::raw_svector_ostream os(LogResult);
663
664  // Figure out the language and whether or not it uses PCH.
665  const char *lang = 0;
666  bool usesPCH = false;
667
668  for (std::vector<const char*>::iterator I = argv.begin(), E = argv.end();
669       I != E; ++I) {
670    if (*I == 0)
671      continue;
672    if (strcmp(*I, "-x") == 0) {
673      if (I + 1 != E) {
674        lang = *(++I);
675        continue;
676      }
677    }
678    else if (strcmp(*I, "-include") == 0) {
679      if (I+1 != E) {
680        const char *arg = *(++I);
681        llvm::SmallString<512> pchName;
682        {
683          llvm::raw_svector_ostream os(pchName);
684          os << arg << ".pth";
685        }
686        pchName.push_back('\0');
687        struct stat stat_results;
688        if (stat(pchName.data(), &stat_results) == 0)
689          usesPCH = true;
690        continue;
691      }
692    }
693  }
694
695  os << "{ ";
696  os << "\"wall\": " << (EndTime.getWallTime() - StartTime.getWallTime());
697  os << ", \"numRes\": " << Results->NumResults;
698  os << ", \"diags\": " << Results->Diagnostics.size();
699  os << ", \"pch\": " << (usesPCH ? "true" : "false");
700  os << ", \"lang\": \"" << (lang ? lang : "<unknown>") << '"';
701  const char *name = getlogin();
702  os << ", \"user\": \"" << (name ? name : "unknown") << '"';
703  os << ", \"clangVer\": \"" << getClangFullVersion() << '"';
704  os << " }";
705
706  llvm::StringRef res = os.str();
707  if (res.size() > 0) {
708    do {
709      // Setup the UDP socket.
710      struct sockaddr_in servaddr;
711      bzero(&servaddr, sizeof(servaddr));
712      servaddr.sin_family = AF_INET;
713      servaddr.sin_port = htons(UDP_CODE_COMPLETION_LOGGER_PORT);
714      if (inet_pton(AF_INET, UDP_CODE_COMPLETION_LOGGER,
715                    &servaddr.sin_addr) <= 0)
716        break;
717
718      int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
719      if (sockfd < 0)
720        break;
721
722      sendto(sockfd, res.data(), res.size(), 0,
723             (struct sockaddr *)&servaddr, sizeof(servaddr));
724      close(sockfd);
725    }
726    while (false);
727  }
728#endif
729#endif
730  CCAI->result = Results;
731}
732CXCodeCompleteResults *clang_codeCompleteAt(CXTranslationUnit TU,
733                                            const char *complete_filename,
734                                            unsigned complete_line,
735                                            unsigned complete_column,
736                                            struct CXUnsavedFile *unsaved_files,
737                                            unsigned num_unsaved_files,
738                                            unsigned options) {
739  CodeCompleteAtInfo CCAI = { TU, complete_filename, complete_line,
740                              complete_column, unsaved_files, num_unsaved_files,
741                              options, 0 };
742  llvm::CrashRecoveryContext CRC;
743
744  if (!CRC.RunSafely(clang_codeCompleteAt_Impl, &CCAI)) {
745    fprintf(stderr, "libclang: crash detected in code completion\n");
746    static_cast<ASTUnit *>(TU)->setUnsafeToFree(true);
747    return 0;
748  }
749
750  return CCAI.result;
751}
752
753unsigned clang_defaultCodeCompleteOptions(void) {
754  return CXCodeComplete_IncludeMacros;
755}
756
757void clang_disposeCodeCompleteResults(CXCodeCompleteResults *ResultsIn) {
758  if (!ResultsIn)
759    return;
760
761  AllocatedCXCodeCompleteResults *Results
762    = static_cast<AllocatedCXCodeCompleteResults*>(ResultsIn);
763  delete Results;
764}
765
766unsigned
767clang_codeCompleteGetNumDiagnostics(CXCodeCompleteResults *ResultsIn) {
768  AllocatedCXCodeCompleteResults *Results
769    = static_cast<AllocatedCXCodeCompleteResults*>(ResultsIn);
770  if (!Results)
771    return 0;
772
773  return Results->Diagnostics.size();
774}
775
776CXDiagnostic
777clang_codeCompleteGetDiagnostic(CXCodeCompleteResults *ResultsIn,
778                                unsigned Index) {
779  AllocatedCXCodeCompleteResults *Results
780    = static_cast<AllocatedCXCodeCompleteResults*>(ResultsIn);
781  if (!Results || Index >= Results->Diagnostics.size())
782    return 0;
783
784  return new CXStoredDiagnostic(Results->Diagnostics[Index], Results->LangOpts);
785}
786
787
788} // end extern "C"
789
790namespace {
791  struct OrderCompletionResults {
792    bool operator()(const CXCompletionResult &XR,
793                    const CXCompletionResult &YR) const {
794      CXStoredCodeCompletionString *X
795        = (CXStoredCodeCompletionString *)XR.CompletionString;
796      CXStoredCodeCompletionString *Y
797        = (CXStoredCodeCompletionString *)YR.CompletionString;
798
799      const char *XText = X->getTypedText();
800      const char *YText = Y->getTypedText();
801      if (!XText || !YText)
802        return XText != 0;
803
804      int result = llvm::StringRef(XText).compare_lower(YText);
805      if (result < 0)
806        return true;
807      if (result > 0)
808        return false;
809
810      result = llvm::StringRef(XText).compare(YText);
811      return result;
812    }
813  };
814}
815
816extern "C" {
817  void clang_sortCodeCompletionResults(CXCompletionResult *Results,
818                                       unsigned NumResults) {
819    std::stable_sort(Results, Results + NumResults, OrderCompletionResults());
820  }
821}