CIndex.cpp revision 83889a7f1f338e343ef72aeeef9c27f7b62c0f0f 
1//===- CIndex.cpp - Clang-C Source Indexing Library -----------------------===//
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 main API hooks in the Clang-C Source Indexing
11// library.
12//
13//===----------------------------------------------------------------------===//
14
15#include "CIndexer.h"
16#include "CXCursor.h"
17#include "CXType.h"
18#include "CXSourceLocation.h"
19#include "CIndexDiagnostic.h"
20
21#include "clang/Basic/Version.h"
22
23#include "clang/AST/DeclVisitor.h"
24#include "clang/AST/StmtVisitor.h"
25#include "clang/AST/TypeLocVisitor.h"
26#include "clang/Basic/Diagnostic.h"
27#include "clang/Frontend/ASTUnit.h"
28#include "clang/Frontend/CompilerInstance.h"
29#include "clang/Frontend/FrontendDiagnostic.h"
30#include "clang/Lex/Lexer.h"
31#include "clang/Lex/PreprocessingRecord.h"
32#include "clang/Lex/Preprocessor.h"
33#include "llvm/ADT/STLExtras.h"
34#include "llvm/Support/CrashRecoveryContext.h"
35#include "llvm/Support/PrettyStackTrace.h"
36#include "llvm/Support/MemoryBuffer.h"
37#include "llvm/Support/raw_ostream.h"
38#include "llvm/Support/Timer.h"
39#include "llvm/System/Mutex.h"
40#include "llvm/System/Program.h"
41#include "llvm/System/Signals.h"
42#include "llvm/System/Threading.h"
43
44// Needed to define L_TMPNAM on some systems.
45#include <cstdio>
46
47using namespace clang;
48using namespace clang::cxcursor;
49using namespace clang::cxstring;
50
51//===----------------------------------------------------------------------===//
52// Crash Reporting.
53//===----------------------------------------------------------------------===//
54
55#ifdef USE_CRASHTRACER
56#include "clang/Analysis/Support/SaveAndRestore.h"
57// Integrate with crash reporter.
58static const char *__crashreporter_info__ = 0;
59asm(".desc ___crashreporter_info__, 0x10");
60#define NUM_CRASH_STRINGS 32
61static unsigned crashtracer_counter = 0;
62static unsigned crashtracer_counter_id[NUM_CRASH_STRINGS] = { 0 };
63static const char *crashtracer_strings[NUM_CRASH_STRINGS] = { 0 };
64static const char *agg_crashtracer_strings[NUM_CRASH_STRINGS] = { 0 };
65
66static unsigned SetCrashTracerInfo(const char *str,
67                                   llvm::SmallString<1024> &AggStr) {
68
69  unsigned slot = 0;
70  while (crashtracer_strings[slot]) {
71    if (++slot == NUM_CRASH_STRINGS)
72      slot = 0;
73  }
74  crashtracer_strings[slot] = str;
75  crashtracer_counter_id[slot] = ++crashtracer_counter;
76
77  // We need to create an aggregate string because multiple threads
78  // may be in this method at one time.  The crash reporter string
79  // will attempt to overapproximate the set of in-flight invocations
80  // of this function.  Race conditions can still cause this goal
81  // to not be achieved.
82  {
83    llvm::raw_svector_ostream Out(AggStr);
84    for (unsigned i = 0; i < NUM_CRASH_STRINGS; ++i)
85      if (crashtracer_strings[i]) Out << crashtracer_strings[i] << '\n';
86  }
87  __crashreporter_info__ = agg_crashtracer_strings[slot] =  AggStr.c_str();
88  return slot;
89}
90
91static void ResetCrashTracerInfo(unsigned slot) {
92  unsigned max_slot = 0;
93  unsigned max_value = 0;
94
95  crashtracer_strings[slot] = agg_crashtracer_strings[slot] = 0;
96
97  for (unsigned i = 0 ; i < NUM_CRASH_STRINGS; ++i)
98    if (agg_crashtracer_strings[i] &&
99        crashtracer_counter_id[i] > max_value) {
100      max_slot = i;
101      max_value = crashtracer_counter_id[i];
102    }
103
104  __crashreporter_info__ = agg_crashtracer_strings[max_slot];
105}
106
107namespace {
108class ArgsCrashTracerInfo {
109  llvm::SmallString<1024> CrashString;
110  llvm::SmallString<1024> AggregateString;
111  unsigned crashtracerSlot;
112public:
113  ArgsCrashTracerInfo(llvm::SmallVectorImpl<const char*> &Args)
114    : crashtracerSlot(0)
115  {
116    {
117      llvm::raw_svector_ostream Out(CrashString);
118      Out << "ClangCIndex [" << getClangFullVersion() << "]"
119          << "[createTranslationUnitFromSourceFile]: clang";
120      for (llvm::SmallVectorImpl<const char*>::iterator I=Args.begin(),
121           E=Args.end(); I!=E; ++I)
122        Out << ' ' << *I;
123    }
124    crashtracerSlot = SetCrashTracerInfo(CrashString.c_str(),
125                                         AggregateString);
126  }
127
128  ~ArgsCrashTracerInfo() {
129    ResetCrashTracerInfo(crashtracerSlot);
130  }
131};
132}
133#endif
134
135/// \brief The result of comparing two source ranges.
136enum RangeComparisonResult {
137  /// \brief Either the ranges overlap or one of the ranges is invalid.
138  RangeOverlap,
139
140  /// \brief The first range ends before the second range starts.
141  RangeBefore,
142
143  /// \brief The first range starts after the second range ends.
144  RangeAfter
145};
146
147/// \brief Compare two source ranges to determine their relative position in
148/// the translation unit.
149static RangeComparisonResult RangeCompare(SourceManager &SM,
150                                          SourceRange R1,
151                                          SourceRange R2) {
152  assert(R1.isValid() && "First range is invalid?");
153  assert(R2.isValid() && "Second range is invalid?");
154  if (R1.getEnd() != R2.getBegin() &&
155      SM.isBeforeInTranslationUnit(R1.getEnd(), R2.getBegin()))
156    return RangeBefore;
157  if (R2.getEnd() != R1.getBegin() &&
158      SM.isBeforeInTranslationUnit(R2.getEnd(), R1.getBegin()))
159    return RangeAfter;
160  return RangeOverlap;
161}
162
163/// \brief Determine if a source location falls within, before, or after a
164///   a given source range.
165static RangeComparisonResult LocationCompare(SourceManager &SM,
166                                             SourceLocation L, SourceRange R) {
167  assert(R.isValid() && "First range is invalid?");
168  assert(L.isValid() && "Second range is invalid?");
169  if (L == R.getBegin() || L == R.getEnd())
170    return RangeOverlap;
171  if (SM.isBeforeInTranslationUnit(L, R.getBegin()))
172    return RangeBefore;
173  if (SM.isBeforeInTranslationUnit(R.getEnd(), L))
174    return RangeAfter;
175  return RangeOverlap;
176}
177
178/// \brief Translate a Clang source range into a CIndex source range.
179///
180/// Clang internally represents ranges where the end location points to the
181/// start of the token at the end. However, for external clients it is more
182/// useful to have a CXSourceRange be a proper half-open interval. This routine
183/// does the appropriate translation.
184CXSourceRange cxloc::translateSourceRange(const SourceManager &SM,
185                                          const LangOptions &LangOpts,
186                                          const CharSourceRange &R) {
187  // We want the last character in this location, so we will adjust the
188  // location accordingly.
189  // FIXME: How do do this with a macro instantiation location?
190  SourceLocation EndLoc = R.getEnd();
191  if (R.isTokenRange() && !EndLoc.isInvalid() && EndLoc.isFileID()) {
192    unsigned Length = Lexer::MeasureTokenLength(EndLoc, SM, LangOpts);
193    EndLoc = EndLoc.getFileLocWithOffset(Length);
194  }
195
196  CXSourceRange Result = { { (void *)&SM, (void *)&LangOpts },
197                           R.getBegin().getRawEncoding(),
198                           EndLoc.getRawEncoding() };
199  return Result;
200}
201
202//===----------------------------------------------------------------------===//
203// Cursor visitor.
204//===----------------------------------------------------------------------===//
205
206namespace {
207
208// Cursor visitor.
209class CursorVisitor : public DeclVisitor<CursorVisitor, bool>,
210                      public TypeLocVisitor<CursorVisitor, bool>,
211                      public StmtVisitor<CursorVisitor, bool>
212{
213  /// \brief The translation unit we are traversing.
214  ASTUnit *TU;
215
216  /// \brief The parent cursor whose children we are traversing.
217  CXCursor Parent;
218
219  /// \brief The declaration that serves at the parent of any statement or
220  /// expression nodes.
221  Decl *StmtParent;
222
223  /// \brief The visitor function.
224  CXCursorVisitor Visitor;
225
226  /// \brief The opaque client data, to be passed along to the visitor.
227  CXClientData ClientData;
228
229  // MaxPCHLevel - the maximum PCH level of declarations that we will pass on
230  // to the visitor. Declarations with a PCH level greater than this value will
231  // be suppressed.
232  unsigned MaxPCHLevel;
233
234  /// \brief When valid, a source range to which the cursor should restrict
235  /// its search.
236  SourceRange RegionOfInterest;
237
238  using DeclVisitor<CursorVisitor, bool>::Visit;
239  using TypeLocVisitor<CursorVisitor, bool>::Visit;
240  using StmtVisitor<CursorVisitor, bool>::Visit;
241
242  /// \brief Determine whether this particular source range comes before, comes
243  /// after, or overlaps the region of interest.
244  ///
245  /// \param R a half-open source range retrieved from the abstract syntax tree.
246  RangeComparisonResult CompareRegionOfInterest(SourceRange R);
247
248  class SetParentRAII {
249    CXCursor &Parent;
250    Decl *&StmtParent;
251    CXCursor OldParent;
252
253  public:
254    SetParentRAII(CXCursor &Parent, Decl *&StmtParent, CXCursor NewParent)
255      : Parent(Parent), StmtParent(StmtParent), OldParent(Parent)
256    {
257      Parent = NewParent;
258      if (clang_isDeclaration(Parent.kind))
259        StmtParent = getCursorDecl(Parent);
260    }
261
262    ~SetParentRAII() {
263      Parent = OldParent;
264      if (clang_isDeclaration(Parent.kind))
265        StmtParent = getCursorDecl(Parent);
266    }
267  };
268
269public:
270  CursorVisitor(ASTUnit *TU, CXCursorVisitor Visitor, CXClientData ClientData,
271                unsigned MaxPCHLevel,
272                SourceRange RegionOfInterest = SourceRange())
273    : TU(TU), Visitor(Visitor), ClientData(ClientData),
274      MaxPCHLevel(MaxPCHLevel), RegionOfInterest(RegionOfInterest)
275  {
276    Parent.kind = CXCursor_NoDeclFound;
277    Parent.data[0] = 0;
278    Parent.data[1] = 0;
279    Parent.data[2] = 0;
280    StmtParent = 0;
281  }
282
283  bool Visit(CXCursor Cursor, bool CheckedRegionOfInterest = false);
284
285  std::pair<PreprocessingRecord::iterator, PreprocessingRecord::iterator>
286    getPreprocessedEntities();
287
288  bool VisitChildren(CXCursor Parent);
289
290  // Declaration visitors
291  bool VisitAttributes(Decl *D);
292  bool VisitBlockDecl(BlockDecl *B);
293  bool VisitCXXRecordDecl(CXXRecordDecl *D);
294  bool VisitDeclContext(DeclContext *DC);
295  bool VisitTranslationUnitDecl(TranslationUnitDecl *D);
296  bool VisitTypedefDecl(TypedefDecl *D);
297  bool VisitTagDecl(TagDecl *D);
298  bool VisitClassTemplateSpecializationDecl(ClassTemplateSpecializationDecl *D);
299  bool VisitClassTemplatePartialSpecializationDecl(
300                                     ClassTemplatePartialSpecializationDecl *D);
301  bool VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D);
302  bool VisitEnumConstantDecl(EnumConstantDecl *D);
303  bool VisitDeclaratorDecl(DeclaratorDecl *DD);
304  bool VisitFunctionDecl(FunctionDecl *ND);
305  bool VisitFieldDecl(FieldDecl *D);
306  bool VisitVarDecl(VarDecl *);
307  bool VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D);
308  bool VisitFunctionTemplateDecl(FunctionTemplateDecl *D);
309  bool VisitClassTemplateDecl(ClassTemplateDecl *D);
310  bool VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D);
311  bool VisitObjCMethodDecl(ObjCMethodDecl *ND);
312  bool VisitObjCContainerDecl(ObjCContainerDecl *D);
313  bool VisitObjCCategoryDecl(ObjCCategoryDecl *ND);
314  bool VisitObjCProtocolDecl(ObjCProtocolDecl *PID);
315  bool VisitObjCPropertyDecl(ObjCPropertyDecl *PD);
316  bool VisitObjCInterfaceDecl(ObjCInterfaceDecl *D);
317  bool VisitObjCImplDecl(ObjCImplDecl *D);
318  bool VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D);
319  bool VisitObjCImplementationDecl(ObjCImplementationDecl *D);
320  // FIXME: ObjCCompatibleAliasDecl requires aliased-class locations.
321  bool VisitObjCForwardProtocolDecl(ObjCForwardProtocolDecl *D);
322  bool VisitObjCClassDecl(ObjCClassDecl *D);
323  bool VisitLinkageSpecDecl(LinkageSpecDecl *D);
324  bool VisitNamespaceDecl(NamespaceDecl *D);
325  bool VisitNamespaceAliasDecl(NamespaceAliasDecl *D);
326  bool VisitUsingDirectiveDecl(UsingDirectiveDecl *D);
327  bool VisitUsingDecl(UsingDecl *D);
328  bool VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
329  bool VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D);
330
331  // Name visitor
332  bool VisitDeclarationNameInfo(DeclarationNameInfo Name);
333  bool VisitNestedNameSpecifier(NestedNameSpecifier *NNS, SourceRange Range);
334
335  // Template visitors
336  bool VisitTemplateParameters(const TemplateParameterList *Params);
337  bool VisitTemplateName(TemplateName Name, SourceLocation Loc);
338  bool VisitTemplateArgumentLoc(const TemplateArgumentLoc &TAL);
339
340  // Type visitors
341  bool VisitQualifiedTypeLoc(QualifiedTypeLoc TL);
342  bool VisitBuiltinTypeLoc(BuiltinTypeLoc TL);
343  bool VisitTypedefTypeLoc(TypedefTypeLoc TL);
344  bool VisitUnresolvedUsingTypeLoc(UnresolvedUsingTypeLoc TL);
345  bool VisitTagTypeLoc(TagTypeLoc TL);
346  bool VisitTemplateTypeParmTypeLoc(TemplateTypeParmTypeLoc TL);
347  bool VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL);
348  bool VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL);
349  bool VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL);
350  bool VisitPointerTypeLoc(PointerTypeLoc TL);
351  bool VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL);
352  bool VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL);
353  bool VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL);
354  bool VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL);
355  bool VisitFunctionTypeLoc(FunctionTypeLoc TL, bool SkipResultType = false);
356  bool VisitArrayTypeLoc(ArrayTypeLoc TL);
357  bool VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL);
358  // FIXME: Implement visitors here when the unimplemented TypeLocs get
359  // implemented
360  bool VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL);
361  bool VisitTypeOfTypeLoc(TypeOfTypeLoc TL);
362
363  // Statement visitors
364  bool VisitStmt(Stmt *S);
365  bool VisitDeclStmt(DeclStmt *S);
366  bool VisitGotoStmt(GotoStmt *S);
367  bool VisitIfStmt(IfStmt *S);
368  bool VisitSwitchStmt(SwitchStmt *S);
369  bool VisitCaseStmt(CaseStmt *S);
370  bool VisitWhileStmt(WhileStmt *S);
371  bool VisitForStmt(ForStmt *S);
372
373  // Expression visitors
374  bool VisitDeclRefExpr(DeclRefExpr *E);
375  bool VisitCXXOperatorCallExpr(CXXOperatorCallExpr *E);
376  bool VisitBlockExpr(BlockExpr *B);
377  bool VisitCompoundLiteralExpr(CompoundLiteralExpr *E);
378  bool VisitExplicitCastExpr(ExplicitCastExpr *E);
379  bool VisitObjCMessageExpr(ObjCMessageExpr *E);
380  bool VisitObjCEncodeExpr(ObjCEncodeExpr *E);
381  bool VisitOffsetOfExpr(OffsetOfExpr *E);
382  bool VisitSizeOfAlignOfExpr(SizeOfAlignOfExpr *E);
383  bool VisitMemberExpr(MemberExpr *E);
384  bool VisitAddrLabelExpr(AddrLabelExpr *E);
385  bool VisitTypesCompatibleExpr(TypesCompatibleExpr *E);
386  bool VisitVAArgExpr(VAArgExpr *E);
387  bool VisitInitListExpr(InitListExpr *E);
388  bool VisitDesignatedInitExpr(DesignatedInitExpr *E);
389  bool VisitCXXTypeidExpr(CXXTypeidExpr *E);
390  bool VisitCXXUuidofExpr(CXXUuidofExpr *E);
391  bool VisitCXXDefaultArgExpr(CXXDefaultArgExpr *E) { return false; }
392  bool VisitCXXTemporaryObjectExpr(CXXTemporaryObjectExpr *E);
393  bool VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E);
394  bool VisitCXXNewExpr(CXXNewExpr *E);
395  bool VisitCXXPseudoDestructorExpr(CXXPseudoDestructorExpr *E);
396  bool VisitUnaryTypeTraitExpr(UnaryTypeTraitExpr *E);
397  bool VisitOverloadExpr(OverloadExpr *E);
398  bool VisitDependentScopeDeclRefExpr(DependentScopeDeclRefExpr *E);
399  bool VisitCXXUnresolvedConstructExpr(CXXUnresolvedConstructExpr *E);
400  bool VisitCXXDependentScopeMemberExpr(CXXDependentScopeMemberExpr *E);
401  bool VisitUnresolvedMemberExpr(UnresolvedMemberExpr *E);
402};
403
404} // end anonymous namespace
405
406static SourceRange getRawCursorExtent(CXCursor C);
407
408RangeComparisonResult CursorVisitor::CompareRegionOfInterest(SourceRange R) {
409  return RangeCompare(TU->getSourceManager(), R, RegionOfInterest);
410}
411
412/// \brief Visit the given cursor and, if requested by the visitor,
413/// its children.
414///
415/// \param Cursor the cursor to visit.
416///
417/// \param CheckRegionOfInterest if true, then the caller already checked that
418/// this cursor is within the region of interest.
419///
420/// \returns true if the visitation should be aborted, false if it
421/// should continue.
422bool CursorVisitor::Visit(CXCursor Cursor, bool CheckedRegionOfInterest) {
423  if (clang_isInvalid(Cursor.kind))
424    return false;
425
426  if (clang_isDeclaration(Cursor.kind)) {
427    Decl *D = getCursorDecl(Cursor);
428    assert(D && "Invalid declaration cursor");
429    if (D->getPCHLevel() > MaxPCHLevel)
430      return false;
431
432    if (D->isImplicit())
433      return false;
434  }
435
436  // If we have a range of interest, and this cursor doesn't intersect with it,
437  // we're done.
438  if (RegionOfInterest.isValid() && !CheckedRegionOfInterest) {
439    SourceRange Range = getRawCursorExtent(Cursor);
440    if (Range.isInvalid() || CompareRegionOfInterest(Range))
441      return false;
442  }
443
444  switch (Visitor(Cursor, Parent, ClientData)) {
445  case CXChildVisit_Break:
446    return true;
447
448  case CXChildVisit_Continue:
449    return false;
450
451  case CXChildVisit_Recurse:
452    return VisitChildren(Cursor);
453  }
454
455  return false;
456}
457
458std::pair<PreprocessingRecord::iterator, PreprocessingRecord::iterator>
459CursorVisitor::getPreprocessedEntities() {
460  PreprocessingRecord &PPRec
461    = *TU->getPreprocessor().getPreprocessingRecord();
462
463  bool OnlyLocalDecls
464    = !TU->isMainFileAST() && TU->getOnlyLocalDecls();
465
466  // There is no region of interest; we have to walk everything.
467  if (RegionOfInterest.isInvalid())
468    return std::make_pair(PPRec.begin(OnlyLocalDecls),
469                          PPRec.end(OnlyLocalDecls));
470
471  // Find the file in which the region of interest lands.
472  SourceManager &SM = TU->getSourceManager();
473  std::pair<FileID, unsigned> Begin
474    = SM.getDecomposedInstantiationLoc(RegionOfInterest.getBegin());
475  std::pair<FileID, unsigned> End
476    = SM.getDecomposedInstantiationLoc(RegionOfInterest.getEnd());
477
478  // The region of interest spans files; we have to walk everything.
479  if (Begin.first != End.first)
480    return std::make_pair(PPRec.begin(OnlyLocalDecls),
481                          PPRec.end(OnlyLocalDecls));
482
483  ASTUnit::PreprocessedEntitiesByFileMap &ByFileMap
484    = TU->getPreprocessedEntitiesByFile();
485  if (ByFileMap.empty()) {
486    // Build the mapping from files to sets of preprocessed entities.
487    for (PreprocessingRecord::iterator E = PPRec.begin(OnlyLocalDecls),
488                                    EEnd = PPRec.end(OnlyLocalDecls);
489         E != EEnd; ++E) {
490      std::pair<FileID, unsigned> P
491        = SM.getDecomposedInstantiationLoc((*E)->getSourceRange().getBegin());
492      ByFileMap[P.first].push_back(*E);
493    }
494  }
495
496  return std::make_pair(ByFileMap[Begin.first].begin(),
497                        ByFileMap[Begin.first].end());
498}
499
500/// \brief Visit the children of the given cursor.
501///
502/// \returns true if the visitation should be aborted, false if it
503/// should continue.
504bool CursorVisitor::VisitChildren(CXCursor Cursor) {
505  if (clang_isReference(Cursor.kind)) {
506    // By definition, references have no children.
507    return false;
508  }
509
510  // Set the Parent field to Cursor, then back to its old value once we're
511  // done.
512  SetParentRAII SetParent(Parent, StmtParent, Cursor);
513
514  if (clang_isDeclaration(Cursor.kind)) {
515    Decl *D = getCursorDecl(Cursor);
516    assert(D && "Invalid declaration cursor");
517    return VisitAttributes(D) || Visit(D);
518  }
519
520  if (clang_isStatement(Cursor.kind))
521    return Visit(getCursorStmt(Cursor));
522  if (clang_isExpression(Cursor.kind))
523    return Visit(getCursorExpr(Cursor));
524
525  if (clang_isTranslationUnit(Cursor.kind)) {
526    ASTUnit *CXXUnit = getCursorASTUnit(Cursor);
527    if (!CXXUnit->isMainFileAST() && CXXUnit->getOnlyLocalDecls() &&
528        RegionOfInterest.isInvalid()) {
529      for (ASTUnit::top_level_iterator TL = CXXUnit->top_level_begin(),
530                                    TLEnd = CXXUnit->top_level_end();
531           TL != TLEnd; ++TL) {
532        if (Visit(MakeCXCursor(*TL, CXXUnit), true))
533          return true;
534      }
535    } else if (VisitDeclContext(
536                            CXXUnit->getASTContext().getTranslationUnitDecl()))
537      return true;
538
539    // Walk the preprocessing record.
540    if (CXXUnit->getPreprocessor().getPreprocessingRecord()) {
541      // FIXME: Once we have the ability to deserialize a preprocessing record,
542      // do so.
543      PreprocessingRecord::iterator E, EEnd;
544      for (llvm::tie(E, EEnd) = getPreprocessedEntities(); E != EEnd; ++E) {
545        if (MacroInstantiation *MI = dyn_cast<MacroInstantiation>(*E)) {
546          if (Visit(MakeMacroInstantiationCursor(MI, CXXUnit)))
547            return true;
548
549          continue;
550        }
551
552        if (MacroDefinition *MD = dyn_cast<MacroDefinition>(*E)) {
553          if (Visit(MakeMacroDefinitionCursor(MD, CXXUnit)))
554            return true;
555
556          continue;
557        }
558      }
559    }
560    return false;
561  }
562
563  // Nothing to visit at the moment.
564  return false;
565}
566
567bool CursorVisitor::VisitBlockDecl(BlockDecl *B) {
568  if (Visit(B->getSignatureAsWritten()->getTypeLoc()))
569    return true;
570
571  if (Stmt *Body = B->getBody())
572    return Visit(MakeCXCursor(Body, StmtParent, TU));
573
574  return false;
575}
576
577bool CursorVisitor::VisitDeclContext(DeclContext *DC) {
578  for (DeclContext::decl_iterator
579       I = DC->decls_begin(), E = DC->decls_end(); I != E; ++I) {
580
581    Decl *D = *I;
582    if (D->getLexicalDeclContext() != DC)
583      continue;
584
585    CXCursor Cursor = MakeCXCursor(D, TU);
586
587    if (RegionOfInterest.isValid()) {
588      SourceRange Range = getRawCursorExtent(Cursor);
589      if (Range.isInvalid())
590        continue;
591
592      switch (CompareRegionOfInterest(Range)) {
593      case RangeBefore:
594        // This declaration comes before the region of interest; skip it.
595        continue;
596
597      case RangeAfter:
598        // This declaration comes after the region of interest; we're done.
599        return false;
600
601      case RangeOverlap:
602        // This declaration overlaps the region of interest; visit it.
603        break;
604      }
605    }
606
607    if (Visit(Cursor, true))
608      return true;
609  }
610
611  return false;
612}
613
614bool CursorVisitor::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
615  llvm_unreachable("Translation units are visited directly by Visit()");
616  return false;
617}
618
619bool CursorVisitor::VisitTypedefDecl(TypedefDecl *D) {
620  if (TypeSourceInfo *TSInfo = D->getTypeSourceInfo())
621    return Visit(TSInfo->getTypeLoc());
622
623  return false;
624}
625
626bool CursorVisitor::VisitTagDecl(TagDecl *D) {
627  return VisitDeclContext(D);
628}
629
630bool CursorVisitor::VisitClassTemplateSpecializationDecl(
631                                          ClassTemplateSpecializationDecl *D) {
632  bool ShouldVisitBody = false;
633  switch (D->getSpecializationKind()) {
634  case TSK_Undeclared:
635  case TSK_ImplicitInstantiation:
636    // Nothing to visit
637    return false;
638
639  case TSK_ExplicitInstantiationDeclaration:
640  case TSK_ExplicitInstantiationDefinition:
641    break;
642
643  case TSK_ExplicitSpecialization:
644    ShouldVisitBody = true;
645    break;
646  }
647
648  // Visit the template arguments used in the specialization.
649  if (TypeSourceInfo *SpecType = D->getTypeAsWritten()) {
650    TypeLoc TL = SpecType->getTypeLoc();
651    if (TemplateSpecializationTypeLoc *TSTLoc
652          = dyn_cast<TemplateSpecializationTypeLoc>(&TL)) {
653      for (unsigned I = 0, N = TSTLoc->getNumArgs(); I != N; ++I)
654        if (VisitTemplateArgumentLoc(TSTLoc->getArgLoc(I)))
655          return true;
656    }
657  }
658
659  if (ShouldVisitBody && VisitCXXRecordDecl(D))
660    return true;
661
662  return false;
663}
664
665bool CursorVisitor::VisitClassTemplatePartialSpecializationDecl(
666                                   ClassTemplatePartialSpecializationDecl *D) {
667  // FIXME: Visit the "outer" template parameter lists on the TagDecl
668  // before visiting these template parameters.
669  if (VisitTemplateParameters(D->getTemplateParameters()))
670    return true;
671
672  // Visit the partial specialization arguments.
673  const TemplateArgumentLoc *TemplateArgs = D->getTemplateArgsAsWritten();
674  for (unsigned I = 0, N = D->getNumTemplateArgsAsWritten(); I != N; ++I)
675    if (VisitTemplateArgumentLoc(TemplateArgs[I]))
676      return true;
677
678  return VisitCXXRecordDecl(D);
679}
680
681bool CursorVisitor::VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D) {
682  // Visit the default argument.
683  if (D->hasDefaultArgument() && !D->defaultArgumentWasInherited())
684    if (TypeSourceInfo *DefArg = D->getDefaultArgumentInfo())
685      if (Visit(DefArg->getTypeLoc()))
686        return true;
687
688  return false;
689}
690
691bool CursorVisitor::VisitEnumConstantDecl(EnumConstantDecl *D) {
692  if (Expr *Init = D->getInitExpr())
693    return Visit(MakeCXCursor(Init, StmtParent, TU));
694  return false;
695}
696
697bool CursorVisitor::VisitDeclaratorDecl(DeclaratorDecl *DD) {
698  if (TypeSourceInfo *TSInfo = DD->getTypeSourceInfo())
699    if (Visit(TSInfo->getTypeLoc()))
700      return true;
701
702  return false;
703}
704
705/// \brief Compare two base or member initializers based on their source order.
706static int CompareCXXBaseOrMemberInitializers(const void* Xp, const void *Yp) {
707  CXXBaseOrMemberInitializer const * const *X
708    = static_cast<CXXBaseOrMemberInitializer const * const *>(Xp);
709  CXXBaseOrMemberInitializer const * const *Y
710    = static_cast<CXXBaseOrMemberInitializer const * const *>(Yp);
711
712  if ((*X)->getSourceOrder() < (*Y)->getSourceOrder())
713    return -1;
714  else if ((*X)->getSourceOrder() > (*Y)->getSourceOrder())
715    return 1;
716  else
717    return 0;
718}
719
720bool CursorVisitor::VisitFunctionDecl(FunctionDecl *ND) {
721  if (TypeSourceInfo *TSInfo = ND->getTypeSourceInfo()) {
722    // Visit the function declaration's syntactic components in the order
723    // written. This requires a bit of work.
724    TypeLoc TL = TSInfo->getTypeLoc();
725    FunctionTypeLoc *FTL = dyn_cast<FunctionTypeLoc>(&TL);
726
727    // If we have a function declared directly (without the use of a typedef),
728    // visit just the return type. Otherwise, just visit the function's type
729    // now.
730    if ((FTL && !isa<CXXConversionDecl>(ND) && Visit(FTL->getResultLoc())) ||
731        (!FTL && Visit(TL)))
732      return true;
733
734    // Visit the nested-name-specifier, if present.
735    if (NestedNameSpecifier *Qualifier = ND->getQualifier())
736      if (VisitNestedNameSpecifier(Qualifier, ND->getQualifierRange()))
737        return true;
738
739    // Visit the declaration name.
740    if (VisitDeclarationNameInfo(ND->getNameInfo()))
741      return true;
742
743    // FIXME: Visit explicitly-specified template arguments!
744
745    // Visit the function parameters, if we have a function type.
746    if (FTL && VisitFunctionTypeLoc(*FTL, true))
747      return true;
748
749    // FIXME: Attributes?
750  }
751
752  if (ND->isThisDeclarationADefinition()) {
753    if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(ND)) {
754      // Find the initializers that were written in the source.
755      llvm::SmallVector<CXXBaseOrMemberInitializer *, 4> WrittenInits;
756      for (CXXConstructorDecl::init_iterator I = Constructor->init_begin(),
757                                          IEnd = Constructor->init_end();
758           I != IEnd; ++I) {
759        if (!(*I)->isWritten())
760          continue;
761
762        WrittenInits.push_back(*I);
763      }
764
765      // Sort the initializers in source order
766      llvm::array_pod_sort(WrittenInits.begin(), WrittenInits.end(),
767                           &CompareCXXBaseOrMemberInitializers);
768
769      // Visit the initializers in source order
770      for (unsigned I = 0, N = WrittenInits.size(); I != N; ++I) {
771        CXXBaseOrMemberInitializer *Init = WrittenInits[I];
772        if (Init->isMemberInitializer()) {
773          if (Visit(MakeCursorMemberRef(Init->getMember(),
774                                        Init->getMemberLocation(), TU)))
775            return true;
776        } else if (TypeSourceInfo *BaseInfo = Init->getBaseClassInfo()) {
777          if (Visit(BaseInfo->getTypeLoc()))
778            return true;
779        }
780
781        // Visit the initializer value.
782        if (Expr *Initializer = Init->getInit())
783          if (Visit(MakeCXCursor(Initializer, ND, TU)))
784            return true;
785      }
786    }
787
788    if (Visit(MakeCXCursor(ND->getBody(), StmtParent, TU)))
789      return true;
790  }
791
792  return false;
793}
794
795bool CursorVisitor::VisitFieldDecl(FieldDecl *D) {
796  if (VisitDeclaratorDecl(D))
797    return true;
798
799  if (Expr *BitWidth = D->getBitWidth())
800    return Visit(MakeCXCursor(BitWidth, StmtParent, TU));
801
802  return false;
803}
804
805bool CursorVisitor::VisitVarDecl(VarDecl *D) {
806  if (VisitDeclaratorDecl(D))
807    return true;
808
809  if (Expr *Init = D->getInit())
810    return Visit(MakeCXCursor(Init, StmtParent, TU));
811
812  return false;
813}
814
815bool CursorVisitor::VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D) {
816  if (VisitDeclaratorDecl(D))
817    return true;
818
819  if (D->hasDefaultArgument() && !D->defaultArgumentWasInherited())
820    if (Expr *DefArg = D->getDefaultArgument())
821      return Visit(MakeCXCursor(DefArg, StmtParent, TU));
822
823  return false;
824}
825
826bool CursorVisitor::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
827  // FIXME: Visit the "outer" template parameter lists on the FunctionDecl
828  // before visiting these template parameters.
829  if (VisitTemplateParameters(D->getTemplateParameters()))
830    return true;
831
832  return VisitFunctionDecl(D->getTemplatedDecl());
833}
834
835bool CursorVisitor::VisitClassTemplateDecl(ClassTemplateDecl *D) {
836  // FIXME: Visit the "outer" template parameter lists on the TagDecl
837  // before visiting these template parameters.
838  if (VisitTemplateParameters(D->getTemplateParameters()))
839    return true;
840
841  return VisitCXXRecordDecl(D->getTemplatedDecl());
842}
843
844bool CursorVisitor::VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D) {
845  if (VisitTemplateParameters(D->getTemplateParameters()))
846    return true;
847
848  if (D->hasDefaultArgument() && !D->defaultArgumentWasInherited() &&
849      VisitTemplateArgumentLoc(D->getDefaultArgument()))
850    return true;
851
852  return false;
853}
854
855bool CursorVisitor::VisitObjCMethodDecl(ObjCMethodDecl *ND) {
856  if (TypeSourceInfo *TSInfo = ND->getResultTypeSourceInfo())
857    if (Visit(TSInfo->getTypeLoc()))
858      return true;
859
860  for (ObjCMethodDecl::param_iterator P = ND->param_begin(),
861       PEnd = ND->param_end();
862       P != PEnd; ++P) {
863    if (Visit(MakeCXCursor(*P, TU)))
864      return true;
865  }
866
867  if (ND->isThisDeclarationADefinition() &&
868      Visit(MakeCXCursor(ND->getBody(), StmtParent, TU)))
869    return true;
870
871  return false;
872}
873
874bool CursorVisitor::VisitObjCContainerDecl(ObjCContainerDecl *D) {
875  return VisitDeclContext(D);
876}
877
878bool CursorVisitor::VisitObjCCategoryDecl(ObjCCategoryDecl *ND) {
879  if (Visit(MakeCursorObjCClassRef(ND->getClassInterface(), ND->getLocation(),
880                                   TU)))
881    return true;
882
883  ObjCCategoryDecl::protocol_loc_iterator PL = ND->protocol_loc_begin();
884  for (ObjCCategoryDecl::protocol_iterator I = ND->protocol_begin(),
885         E = ND->protocol_end(); I != E; ++I, ++PL)
886    if (Visit(MakeCursorObjCProtocolRef(*I, *PL, TU)))
887      return true;
888
889  return VisitObjCContainerDecl(ND);
890}
891
892bool CursorVisitor::VisitObjCProtocolDecl(ObjCProtocolDecl *PID) {
893  ObjCProtocolDecl::protocol_loc_iterator PL = PID->protocol_loc_begin();
894  for (ObjCProtocolDecl::protocol_iterator I = PID->protocol_begin(),
895       E = PID->protocol_end(); I != E; ++I, ++PL)
896    if (Visit(MakeCursorObjCProtocolRef(*I, *PL, TU)))
897      return true;
898
899  return VisitObjCContainerDecl(PID);
900}
901
902bool CursorVisitor::VisitObjCPropertyDecl(ObjCPropertyDecl *PD) {
903  if (PD->getTypeSourceInfo() && Visit(PD->getTypeSourceInfo()->getTypeLoc()))
904    return true;
905
906  // FIXME: This implements a workaround with @property declarations also being
907  // installed in the DeclContext for the @interface.  Eventually this code
908  // should be removed.
909  ObjCCategoryDecl *CDecl = dyn_cast<ObjCCategoryDecl>(PD->getDeclContext());
910  if (!CDecl || !CDecl->IsClassExtension())
911    return false;
912
913  ObjCInterfaceDecl *ID = CDecl->getClassInterface();
914  if (!ID)
915    return false;
916
917  IdentifierInfo *PropertyId = PD->getIdentifier();
918  ObjCPropertyDecl *prevDecl =
919    ObjCPropertyDecl::findPropertyDecl(cast<DeclContext>(ID), PropertyId);
920
921  if (!prevDecl)
922    return false;
923
924  // Visit synthesized methods since they will be skipped when visiting
925  // the @interface.
926  if (ObjCMethodDecl *MD = prevDecl->getGetterMethodDecl())
927    if (MD->isSynthesized() && MD->getLexicalDeclContext() == CDecl)
928      if (Visit(MakeCXCursor(MD, TU)))
929        return true;
930
931  if (ObjCMethodDecl *MD = prevDecl->getSetterMethodDecl())
932    if (MD->isSynthesized() && MD->getLexicalDeclContext() == CDecl)
933      if (Visit(MakeCXCursor(MD, TU)))
934        return true;
935
936  return false;
937}
938
939bool CursorVisitor::VisitObjCInterfaceDecl(ObjCInterfaceDecl *D) {
940  // Issue callbacks for super class.
941  if (D->getSuperClass() &&
942      Visit(MakeCursorObjCSuperClassRef(D->getSuperClass(),
943                                        D->getSuperClassLoc(),
944                                        TU)))
945    return true;
946
947  ObjCInterfaceDecl::protocol_loc_iterator PL = D->protocol_loc_begin();
948  for (ObjCInterfaceDecl::protocol_iterator I = D->protocol_begin(),
949         E = D->protocol_end(); I != E; ++I, ++PL)
950    if (Visit(MakeCursorObjCProtocolRef(*I, *PL, TU)))
951      return true;
952
953  return VisitObjCContainerDecl(D);
954}
955
956bool CursorVisitor::VisitObjCImplDecl(ObjCImplDecl *D) {
957  return VisitObjCContainerDecl(D);
958}
959
960bool CursorVisitor::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D) {
961  // 'ID' could be null when dealing with invalid code.
962  if (ObjCInterfaceDecl *ID = D->getClassInterface())
963    if (Visit(MakeCursorObjCClassRef(ID, D->getLocation(), TU)))
964      return true;
965
966  return VisitObjCImplDecl(D);
967}
968
969bool CursorVisitor::VisitObjCImplementationDecl(ObjCImplementationDecl *D) {
970#if 0
971  // Issue callbacks for super class.
972  // FIXME: No source location information!
973  if (D->getSuperClass() &&
974      Visit(MakeCursorObjCSuperClassRef(D->getSuperClass(),
975                                        D->getSuperClassLoc(),
976                                        TU)))
977    return true;
978#endif
979
980  return VisitObjCImplDecl(D);
981}
982
983bool CursorVisitor::VisitObjCForwardProtocolDecl(ObjCForwardProtocolDecl *D) {
984  ObjCForwardProtocolDecl::protocol_loc_iterator PL = D->protocol_loc_begin();
985  for (ObjCForwardProtocolDecl::protocol_iterator I = D->protocol_begin(),
986                                                  E = D->protocol_end();
987       I != E; ++I, ++PL)
988    if (Visit(MakeCursorObjCProtocolRef(*I, *PL, TU)))
989      return true;
990
991  return false;
992}
993
994bool CursorVisitor::VisitObjCClassDecl(ObjCClassDecl *D) {
995  for (ObjCClassDecl::iterator C = D->begin(), CEnd = D->end(); C != CEnd; ++C)
996    if (Visit(MakeCursorObjCClassRef(C->getInterface(), C->getLocation(), TU)))
997      return true;
998
999  return false;
1000}
1001
1002bool CursorVisitor::VisitNamespaceDecl(NamespaceDecl *D) {
1003  return VisitDeclContext(D);
1004}
1005
1006bool CursorVisitor::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
1007  // Visit nested-name-specifier.
1008  if (NestedNameSpecifier *Qualifier = D->getQualifier())
1009    if (VisitNestedNameSpecifier(Qualifier, D->getQualifierRange()))
1010      return true;
1011
1012  return Visit(MakeCursorNamespaceRef(D->getAliasedNamespace(),
1013                                      D->getTargetNameLoc(), TU));
1014}
1015
1016bool CursorVisitor::VisitUsingDecl(UsingDecl *D) {
1017  // Visit nested-name-specifier.
1018  if (NestedNameSpecifier *Qualifier = D->getTargetNestedNameDecl())
1019    if (VisitNestedNameSpecifier(Qualifier, D->getNestedNameRange()))
1020      return true;
1021
1022  if (Visit(MakeCursorOverloadedDeclRef(D, D->getLocation(), TU)))
1023    return true;
1024
1025  return VisitDeclarationNameInfo(D->getNameInfo());
1026}
1027
1028bool CursorVisitor::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
1029  // Visit nested-name-specifier.
1030  if (NestedNameSpecifier *Qualifier = D->getQualifier())
1031    if (VisitNestedNameSpecifier(Qualifier, D->getQualifierRange()))
1032      return true;
1033
1034  return Visit(MakeCursorNamespaceRef(D->getNominatedNamespaceAsWritten(),
1035                                      D->getIdentLocation(), TU));
1036}
1037
1038bool CursorVisitor::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
1039  // Visit nested-name-specifier.
1040  if (NestedNameSpecifier *Qualifier = D->getTargetNestedNameSpecifier())
1041    if (VisitNestedNameSpecifier(Qualifier, D->getTargetNestedNameRange()))
1042      return true;
1043
1044  return VisitDeclarationNameInfo(D->getNameInfo());
1045}
1046
1047bool CursorVisitor::VisitUnresolvedUsingTypenameDecl(
1048                                               UnresolvedUsingTypenameDecl *D) {
1049  // Visit nested-name-specifier.
1050  if (NestedNameSpecifier *Qualifier = D->getTargetNestedNameSpecifier())
1051    if (VisitNestedNameSpecifier(Qualifier, D->getTargetNestedNameRange()))
1052      return true;
1053
1054  return false;
1055}
1056
1057bool CursorVisitor::VisitDeclarationNameInfo(DeclarationNameInfo Name) {
1058  switch (Name.getName().getNameKind()) {
1059  case clang::DeclarationName::Identifier:
1060  case clang::DeclarationName::CXXLiteralOperatorName:
1061  case clang::DeclarationName::CXXOperatorName:
1062  case clang::DeclarationName::CXXUsingDirective:
1063    return false;
1064
1065  case clang::DeclarationName::CXXConstructorName:
1066  case clang::DeclarationName::CXXDestructorName:
1067  case clang::DeclarationName::CXXConversionFunctionName:
1068    if (TypeSourceInfo *TSInfo = Name.getNamedTypeInfo())
1069      return Visit(TSInfo->getTypeLoc());
1070    return false;
1071
1072  case clang::DeclarationName::ObjCZeroArgSelector:
1073  case clang::DeclarationName::ObjCOneArgSelector:
1074  case clang::DeclarationName::ObjCMultiArgSelector:
1075    // FIXME: Per-identifier location info?
1076    return false;
1077  }
1078
1079  return false;
1080}
1081
1082bool CursorVisitor::VisitNestedNameSpecifier(NestedNameSpecifier *NNS,
1083                                             SourceRange Range) {
1084  // FIXME: This whole routine is a hack to work around the lack of proper
1085  // source information in nested-name-specifiers (PR5791). Since we do have
1086  // a beginning source location, we can visit the first component of the
1087  // nested-name-specifier, if it's a single-token component.
1088  if (!NNS)
1089    return false;
1090
1091  // Get the first component in the nested-name-specifier.
1092  while (NestedNameSpecifier *Prefix = NNS->getPrefix())
1093    NNS = Prefix;
1094
1095  switch (NNS->getKind()) {
1096  case NestedNameSpecifier::Namespace:
1097    // FIXME: The token at this source location might actually have been a
1098    // namespace alias, but we don't model that. Lame!
1099    return Visit(MakeCursorNamespaceRef(NNS->getAsNamespace(), Range.getBegin(),
1100                                        TU));
1101
1102  case NestedNameSpecifier::TypeSpec: {
1103    // If the type has a form where we know that the beginning of the source
1104    // range matches up with a reference cursor. Visit the appropriate reference
1105    // cursor.
1106    Type *T = NNS->getAsType();
1107    if (const TypedefType *Typedef = dyn_cast<TypedefType>(T))
1108      return Visit(MakeCursorTypeRef(Typedef->getDecl(), Range.getBegin(), TU));
1109    if (const TagType *Tag = dyn_cast<TagType>(T))
1110      return Visit(MakeCursorTypeRef(Tag->getDecl(), Range.getBegin(), TU));
1111    if (const TemplateSpecializationType *TST
1112                                      = dyn_cast<TemplateSpecializationType>(T))
1113      return VisitTemplateName(TST->getTemplateName(), Range.getBegin());
1114    break;
1115  }
1116
1117  case NestedNameSpecifier::TypeSpecWithTemplate:
1118  case NestedNameSpecifier::Global:
1119  case NestedNameSpecifier::Identifier:
1120    break;
1121  }
1122
1123  return false;
1124}
1125
1126bool CursorVisitor::VisitTemplateParameters(
1127                                          const TemplateParameterList *Params) {
1128  if (!Params)
1129    return false;
1130
1131  for (TemplateParameterList::const_iterator P = Params->begin(),
1132                                          PEnd = Params->end();
1133       P != PEnd; ++P) {
1134    if (Visit(MakeCXCursor(*P, TU)))
1135      return true;
1136  }
1137
1138  return false;
1139}
1140
1141bool CursorVisitor::VisitTemplateName(TemplateName Name, SourceLocation Loc) {
1142  switch (Name.getKind()) {
1143  case TemplateName::Template:
1144    return Visit(MakeCursorTemplateRef(Name.getAsTemplateDecl(), Loc, TU));
1145
1146  case TemplateName::OverloadedTemplate:
1147    // Visit the overloaded template set.
1148    if (Visit(MakeCursorOverloadedDeclRef(Name, Loc, TU)))
1149      return true;
1150
1151    return false;
1152
1153  case TemplateName::DependentTemplate:
1154    // FIXME: Visit nested-name-specifier.
1155    return false;
1156
1157  case TemplateName::QualifiedTemplate:
1158    // FIXME: Visit nested-name-specifier.
1159    return Visit(MakeCursorTemplateRef(
1160                                  Name.getAsQualifiedTemplateName()->getDecl(),
1161                                       Loc, TU));
1162  }
1163
1164  return false;
1165}
1166
1167bool CursorVisitor::VisitTemplateArgumentLoc(const TemplateArgumentLoc &TAL) {
1168  switch (TAL.getArgument().getKind()) {
1169  case TemplateArgument::Null:
1170  case TemplateArgument::Integral:
1171    return false;
1172
1173  case TemplateArgument::Pack:
1174    // FIXME: Implement when variadic templates come along.
1175    return false;
1176
1177  case TemplateArgument::Type:
1178    if (TypeSourceInfo *TSInfo = TAL.getTypeSourceInfo())
1179      return Visit(TSInfo->getTypeLoc());
1180    return false;
1181
1182  case TemplateArgument::Declaration:
1183    if (Expr *E = TAL.getSourceDeclExpression())
1184      return Visit(MakeCXCursor(E, StmtParent, TU));
1185    return false;
1186
1187  case TemplateArgument::Expression:
1188    if (Expr *E = TAL.getSourceExpression())
1189      return Visit(MakeCXCursor(E, StmtParent, TU));
1190    return false;
1191
1192  case TemplateArgument::Template:
1193    return VisitTemplateName(TAL.getArgument().getAsTemplate(),
1194                             TAL.getTemplateNameLoc());
1195  }
1196
1197  return false;
1198}
1199
1200bool CursorVisitor::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
1201  return VisitDeclContext(D);
1202}
1203
1204bool CursorVisitor::VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
1205  return Visit(TL.getUnqualifiedLoc());
1206}
1207
1208bool CursorVisitor::VisitBuiltinTypeLoc(BuiltinTypeLoc TL) {
1209  ASTContext &Context = TU->getASTContext();
1210
1211  // Some builtin types (such as Objective-C's "id", "sel", and
1212  // "Class") have associated declarations. Create cursors for those.
1213  QualType VisitType;
1214  switch (TL.getType()->getAs<BuiltinType>()->getKind()) {
1215  case BuiltinType::Void:
1216  case BuiltinType::Bool:
1217  case BuiltinType::Char_U:
1218  case BuiltinType::UChar:
1219  case BuiltinType::Char16:
1220  case BuiltinType::Char32:
1221  case BuiltinType::UShort:
1222  case BuiltinType::UInt:
1223  case BuiltinType::ULong:
1224  case BuiltinType::ULongLong:
1225  case BuiltinType::UInt128:
1226  case BuiltinType::Char_S:
1227  case BuiltinType::SChar:
1228  case BuiltinType::WChar:
1229  case BuiltinType::Short:
1230  case BuiltinType::Int:
1231  case BuiltinType::Long:
1232  case BuiltinType::LongLong:
1233  case BuiltinType::Int128:
1234  case BuiltinType::Float:
1235  case BuiltinType::Double:
1236  case BuiltinType::LongDouble:
1237  case BuiltinType::NullPtr:
1238  case BuiltinType::Overload:
1239  case BuiltinType::Dependent:
1240    break;
1241
1242  case BuiltinType::UndeducedAuto: // FIXME: Deserves a cursor?
1243    break;
1244
1245  case BuiltinType::ObjCId:
1246    VisitType = Context.getObjCIdType();
1247    break;
1248
1249  case BuiltinType::ObjCClass:
1250    VisitType = Context.getObjCClassType();
1251    break;
1252
1253  case BuiltinType::ObjCSel:
1254    VisitType = Context.getObjCSelType();
1255    break;
1256  }
1257
1258  if (!VisitType.isNull()) {
1259    if (const TypedefType *Typedef = VisitType->getAs<TypedefType>())
1260      return Visit(MakeCursorTypeRef(Typedef->getDecl(), TL.getBuiltinLoc(),
1261                                     TU));
1262  }
1263
1264  return false;
1265}
1266
1267bool CursorVisitor::VisitTypedefTypeLoc(TypedefTypeLoc TL) {
1268  return Visit(MakeCursorTypeRef(TL.getTypedefDecl(), TL.getNameLoc(), TU));
1269}
1270
1271bool CursorVisitor::VisitUnresolvedUsingTypeLoc(UnresolvedUsingTypeLoc TL) {
1272  return Visit(MakeCursorTypeRef(TL.getDecl(), TL.getNameLoc(), TU));
1273}
1274
1275bool CursorVisitor::VisitTagTypeLoc(TagTypeLoc TL) {
1276  return Visit(MakeCursorTypeRef(TL.getDecl(), TL.getNameLoc(), TU));
1277}
1278
1279bool CursorVisitor::VisitTemplateTypeParmTypeLoc(TemplateTypeParmTypeLoc TL) {
1280  // FIXME: We can't visit the template type parameter, because there's
1281  // no context information with which we can match up the depth/index in the
1282  // type to the appropriate
1283  return false;
1284}
1285
1286bool CursorVisitor::VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) {
1287  if (Visit(MakeCursorObjCClassRef(TL.getIFaceDecl(), TL.getNameLoc(), TU)))
1288    return true;
1289
1290  return false;
1291}
1292
1293bool CursorVisitor::VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) {
1294  if (TL.hasBaseTypeAsWritten() && Visit(TL.getBaseLoc()))
1295    return true;
1296
1297  for (unsigned I = 0, N = TL.getNumProtocols(); I != N; ++I) {
1298    if (Visit(MakeCursorObjCProtocolRef(TL.getProtocol(I), TL.getProtocolLoc(I),
1299                                        TU)))
1300      return true;
1301  }
1302
1303  return false;
1304}
1305
1306bool CursorVisitor::VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) {
1307  return Visit(TL.getPointeeLoc());
1308}
1309
1310bool CursorVisitor::VisitPointerTypeLoc(PointerTypeLoc TL) {
1311  return Visit(TL.getPointeeLoc());
1312}
1313
1314bool CursorVisitor::VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) {
1315  return Visit(TL.getPointeeLoc());
1316}
1317
1318bool CursorVisitor::VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) {
1319  return Visit(TL.getPointeeLoc());
1320}
1321
1322bool CursorVisitor::VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) {
1323  return Visit(TL.getPointeeLoc());
1324}
1325
1326bool CursorVisitor::VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) {
1327  return Visit(TL.getPointeeLoc());
1328}
1329
1330bool CursorVisitor::VisitFunctionTypeLoc(FunctionTypeLoc TL,
1331                                         bool SkipResultType) {
1332  if (!SkipResultType && Visit(TL.getResultLoc()))
1333    return true;
1334
1335  for (unsigned I = 0, N = TL.getNumArgs(); I != N; ++I)
1336    if (Decl *D = TL.getArg(I))
1337      if (Visit(MakeCXCursor(D, TU)))
1338        return true;
1339
1340  return false;
1341}
1342
1343bool CursorVisitor::VisitArrayTypeLoc(ArrayTypeLoc TL) {
1344  if (Visit(TL.getElementLoc()))
1345    return true;
1346
1347  if (Expr *Size = TL.getSizeExpr())
1348    return Visit(MakeCXCursor(Size, StmtParent, TU));
1349
1350  return false;
1351}
1352
1353bool CursorVisitor::VisitTemplateSpecializationTypeLoc(
1354                                             TemplateSpecializationTypeLoc TL) {
1355  // Visit the template name.
1356  if (VisitTemplateName(TL.getTypePtr()->getTemplateName(),
1357                        TL.getTemplateNameLoc()))
1358    return true;
1359
1360  // Visit the template arguments.
1361  for (unsigned I = 0, N = TL.getNumArgs(); I != N; ++I)
1362    if (VisitTemplateArgumentLoc(TL.getArgLoc(I)))
1363      return true;
1364
1365  return false;
1366}
1367
1368bool CursorVisitor::VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) {
1369  return Visit(MakeCXCursor(TL.getUnderlyingExpr(), StmtParent, TU));
1370}
1371
1372bool CursorVisitor::VisitTypeOfTypeLoc(TypeOfTypeLoc TL) {
1373  if (TypeSourceInfo *TSInfo = TL.getUnderlyingTInfo())
1374    return Visit(TSInfo->getTypeLoc());
1375
1376  return false;
1377}
1378
1379bool CursorVisitor::VisitStmt(Stmt *S) {
1380  for (Stmt::child_iterator Child = S->child_begin(), ChildEnd = S->child_end();
1381       Child != ChildEnd; ++Child) {
1382    if (Stmt *C = *Child)
1383      if (Visit(MakeCXCursor(C, StmtParent, TU)))
1384        return true;
1385  }
1386
1387  return false;
1388}
1389
1390bool CursorVisitor::VisitCaseStmt(CaseStmt *S) {
1391  // Specially handle CaseStmts because they can be nested, e.g.:
1392  //
1393  //    case 1:
1394  //    case 2:
1395  //
1396  // In this case the second CaseStmt is the child of the first.  Walking
1397  // these recursively can blow out the stack.
1398  CXCursor Cursor = MakeCXCursor(S, StmtParent, TU);
1399  while (true) {
1400    // Set the Parent field to Cursor, then back to its old value once we're
1401    //   done.
1402    SetParentRAII SetParent(Parent, StmtParent, Cursor);
1403
1404    if (Stmt *LHS = S->getLHS())
1405      if (Visit(MakeCXCursor(LHS, StmtParent, TU)))
1406        return true;
1407    if (Stmt *RHS = S->getRHS())
1408      if (Visit(MakeCXCursor(RHS, StmtParent, TU)))
1409        return true;
1410    if (Stmt *SubStmt = S->getSubStmt()) {
1411      if (!isa<CaseStmt>(SubStmt))
1412        return Visit(MakeCXCursor(SubStmt, StmtParent, TU));
1413
1414      // Specially handle 'CaseStmt' so that we don't blow out the stack.
1415      CaseStmt *CS = cast<CaseStmt>(SubStmt);
1416      Cursor = MakeCXCursor(CS, StmtParent, TU);
1417      if (RegionOfInterest.isValid()) {
1418        SourceRange Range = CS->getSourceRange();
1419        if (Range.isInvalid() || CompareRegionOfInterest(Range))
1420          return false;
1421      }
1422
1423      switch (Visitor(Cursor, Parent, ClientData)) {
1424        case CXChildVisit_Break: return true;
1425        case CXChildVisit_Continue: return false;
1426        case CXChildVisit_Recurse:
1427          // Perform tail-recursion manually.
1428          S = CS;
1429          continue;
1430      }
1431    }
1432    return false;
1433  }
1434}
1435
1436bool CursorVisitor::VisitDeclStmt(DeclStmt *S) {
1437  for (DeclStmt::decl_iterator D = S->decl_begin(), DEnd = S->decl_end();
1438       D != DEnd; ++D) {
1439    if (*D && Visit(MakeCXCursor(*D, TU)))
1440      return true;
1441  }
1442
1443  return false;
1444}
1445
1446bool CursorVisitor::VisitGotoStmt(GotoStmt *S) {
1447  return Visit(MakeCursorLabelRef(S->getLabel(), S->getLabelLoc(), TU));
1448}
1449
1450bool CursorVisitor::VisitIfStmt(IfStmt *S) {
1451  if (VarDecl *Var = S->getConditionVariable()) {
1452    if (Visit(MakeCXCursor(Var, TU)))
1453      return true;
1454  }
1455
1456  if (S->getCond() && Visit(MakeCXCursor(S->getCond(), StmtParent, TU)))
1457    return true;
1458  if (S->getThen() && Visit(MakeCXCursor(S->getThen(), StmtParent, TU)))
1459    return true;
1460  if (S->getElse() && Visit(MakeCXCursor(S->getElse(), StmtParent, TU)))
1461    return true;
1462
1463  return false;
1464}
1465
1466bool CursorVisitor::VisitSwitchStmt(SwitchStmt *S) {
1467  if (VarDecl *Var = S->getConditionVariable()) {
1468    if (Visit(MakeCXCursor(Var, TU)))
1469      return true;
1470  }
1471
1472  if (S->getCond() && Visit(MakeCXCursor(S->getCond(), StmtParent, TU)))
1473    return true;
1474  if (S->getBody() && Visit(MakeCXCursor(S->getBody(), StmtParent, TU)))
1475    return true;
1476
1477  return false;
1478}
1479
1480bool CursorVisitor::VisitWhileStmt(WhileStmt *S) {
1481  if (VarDecl *Var = S->getConditionVariable()) {
1482    if (Visit(MakeCXCursor(Var, TU)))
1483      return true;
1484  }
1485
1486  if (S->getCond() && Visit(MakeCXCursor(S->getCond(), StmtParent, TU)))
1487    return true;
1488  if (S->getBody() && Visit(MakeCXCursor(S->getBody(), StmtParent, TU)))
1489    return true;
1490
1491  return false;
1492}
1493
1494bool CursorVisitor::VisitForStmt(ForStmt *S) {
1495  if (S->getInit() && Visit(MakeCXCursor(S->getInit(), StmtParent, TU)))
1496    return true;
1497  if (VarDecl *Var = S->getConditionVariable()) {
1498    if (Visit(MakeCXCursor(Var, TU)))
1499      return true;
1500  }
1501
1502  if (S->getCond() && Visit(MakeCXCursor(S->getCond(), StmtParent, TU)))
1503    return true;
1504  if (S->getInc() && Visit(MakeCXCursor(S->getInc(), StmtParent, TU)))
1505    return true;
1506  if (S->getBody() && Visit(MakeCXCursor(S->getBody(), StmtParent, TU)))
1507    return true;
1508
1509  return false;
1510}
1511
1512bool CursorVisitor::VisitDeclRefExpr(DeclRefExpr *E) {
1513  // Visit nested-name-specifier, if present.
1514  if (NestedNameSpecifier *Qualifier = E->getQualifier())
1515    if (VisitNestedNameSpecifier(Qualifier, E->getQualifierRange()))
1516      return true;
1517
1518  // Visit declaration name.
1519  if (VisitDeclarationNameInfo(E->getNameInfo()))
1520    return true;
1521
1522  // Visit explicitly-specified template arguments.
1523  if (E->hasExplicitTemplateArgs()) {
1524    ExplicitTemplateArgumentList &Args = E->getExplicitTemplateArgs();
1525    for (TemplateArgumentLoc *Arg = Args.getTemplateArgs(),
1526                          *ArgEnd = Arg + Args.NumTemplateArgs;
1527         Arg != ArgEnd; ++Arg)
1528      if (VisitTemplateArgumentLoc(*Arg))
1529        return true;
1530  }
1531
1532  return false;
1533}
1534
1535bool CursorVisitor::VisitCXXOperatorCallExpr(CXXOperatorCallExpr *E) {
1536  if (Visit(MakeCXCursor(E->getArg(0), StmtParent, TU)))
1537    return true;
1538
1539  if (Visit(MakeCXCursor(E->getCallee(), StmtParent, TU)))
1540    return true;
1541
1542  for (unsigned I = 1, N = E->getNumArgs(); I != N; ++I)
1543    if (Visit(MakeCXCursor(E->getArg(I), StmtParent, TU)))
1544      return true;
1545
1546  return false;
1547}
1548
1549bool CursorVisitor::VisitCXXRecordDecl(CXXRecordDecl *D) {
1550  if (D->isDefinition()) {
1551    for (CXXRecordDecl::base_class_iterator I = D->bases_begin(),
1552         E = D->bases_end(); I != E; ++I) {
1553      if (Visit(cxcursor::MakeCursorCXXBaseSpecifier(I, TU)))
1554        return true;
1555    }
1556  }
1557
1558  return VisitTagDecl(D);
1559}
1560
1561
1562bool CursorVisitor::VisitBlockExpr(BlockExpr *B) {
1563  return Visit(B->getBlockDecl());
1564}
1565
1566bool CursorVisitor::VisitOffsetOfExpr(OffsetOfExpr *E) {
1567  // Visit the type into which we're computing an offset.
1568  if (Visit(E->getTypeSourceInfo()->getTypeLoc()))
1569    return true;
1570
1571  // Visit the components of the offsetof expression.
1572  for (unsigned I = 0, N = E->getNumComponents(); I != N; ++I) {
1573    typedef OffsetOfExpr::OffsetOfNode OffsetOfNode;
1574    const OffsetOfNode &Node = E->getComponent(I);
1575    switch (Node.getKind()) {
1576    case OffsetOfNode::Array:
1577      if (Visit(MakeCXCursor(E->getIndexExpr(Node.getArrayExprIndex()),
1578                             StmtParent, TU)))
1579        return true;
1580      break;
1581
1582    case OffsetOfNode::Field:
1583      if (Visit(MakeCursorMemberRef(Node.getField(), Node.getRange().getEnd(),
1584                                    TU)))
1585        return true;
1586      break;
1587
1588    case OffsetOfNode::Identifier:
1589    case OffsetOfNode::Base:
1590      continue;
1591    }
1592  }
1593
1594  return false;
1595}
1596
1597bool CursorVisitor::VisitSizeOfAlignOfExpr(SizeOfAlignOfExpr *E) {
1598  if (E->isArgumentType()) {
1599    if (TypeSourceInfo *TSInfo = E->getArgumentTypeInfo())
1600      return Visit(TSInfo->getTypeLoc());
1601
1602    return false;
1603  }
1604
1605  return VisitExpr(E);
1606}
1607
1608bool CursorVisitor::VisitMemberExpr(MemberExpr *E) {
1609  // Visit the base expression.
1610  if (Visit(MakeCXCursor(E->getBase(), StmtParent, TU)))
1611    return true;
1612
1613  // Visit the nested-name-specifier
1614  if (NestedNameSpecifier *Qualifier = E->getQualifier())
1615    if (VisitNestedNameSpecifier(Qualifier, E->getQualifierRange()))
1616      return true;
1617
1618  // Visit the declaration name.
1619  if (VisitDeclarationNameInfo(E->getMemberNameInfo()))
1620    return true;
1621
1622  // Visit the explicitly-specified template arguments, if any.
1623  if (E->hasExplicitTemplateArgs()) {
1624    for (const TemplateArgumentLoc *Arg = E->getTemplateArgs(),
1625                                *ArgEnd = Arg + E->getNumTemplateArgs();
1626         Arg != ArgEnd;
1627         ++Arg) {
1628      if (VisitTemplateArgumentLoc(*Arg))
1629        return true;
1630    }
1631  }
1632
1633  return false;
1634}
1635
1636bool CursorVisitor::VisitExplicitCastExpr(ExplicitCastExpr *E) {
1637  if (TypeSourceInfo *TSInfo = E->getTypeInfoAsWritten())
1638    if (Visit(TSInfo->getTypeLoc()))
1639      return true;
1640
1641  return VisitCastExpr(E);
1642}
1643
1644bool CursorVisitor::VisitCompoundLiteralExpr(CompoundLiteralExpr *E) {
1645  if (TypeSourceInfo *TSInfo = E->getTypeSourceInfo())
1646    if (Visit(TSInfo->getTypeLoc()))
1647      return true;
1648
1649  return VisitExpr(E);
1650}
1651
1652bool CursorVisitor::VisitAddrLabelExpr(AddrLabelExpr *E) {
1653  return Visit(MakeCursorLabelRef(E->getLabel(), E->getLabelLoc(), TU));
1654}
1655
1656bool CursorVisitor::VisitTypesCompatibleExpr(TypesCompatibleExpr *E) {
1657  return Visit(E->getArgTInfo1()->getTypeLoc()) ||
1658         Visit(E->getArgTInfo2()->getTypeLoc());
1659}
1660
1661bool CursorVisitor::VisitVAArgExpr(VAArgExpr *E) {
1662  if (Visit(E->getWrittenTypeInfo()->getTypeLoc()))
1663    return true;
1664
1665  return Visit(MakeCXCursor(E->getSubExpr(), StmtParent, TU));
1666}
1667
1668bool CursorVisitor::VisitInitListExpr(InitListExpr *E) {
1669  // We care about the syntactic form of the initializer list, only.
1670  if (InitListExpr *Syntactic = E->getSyntacticForm())
1671    return VisitExpr(Syntactic);
1672
1673  return VisitExpr(E);
1674}
1675
1676bool CursorVisitor::VisitDesignatedInitExpr(DesignatedInitExpr *E) {
1677  // Visit the designators.
1678  typedef DesignatedInitExpr::Designator Designator;
1679  for (DesignatedInitExpr::designators_iterator D = E->designators_begin(),
1680                                             DEnd = E->designators_end();
1681       D != DEnd; ++D) {
1682    if (D->isFieldDesignator()) {
1683      if (FieldDecl *Field = D->getField())
1684        if (Visit(MakeCursorMemberRef(Field, D->getFieldLoc(), TU)))
1685          return true;
1686
1687      continue;
1688    }
1689
1690    if (D->isArrayDesignator()) {
1691      if (Visit(MakeCXCursor(E->getArrayIndex(*D), StmtParent, TU)))
1692        return true;
1693
1694      continue;
1695    }
1696
1697    assert(D->isArrayRangeDesignator() && "Unknown designator kind");
1698    if (Visit(MakeCXCursor(E->getArrayRangeStart(*D), StmtParent, TU)) ||
1699        Visit(MakeCXCursor(E->getArrayRangeEnd(*D), StmtParent, TU)))
1700      return true;
1701  }
1702
1703  // Visit the initializer value itself.
1704  return Visit(MakeCXCursor(E->getInit(), StmtParent, TU));
1705}
1706
1707bool CursorVisitor::VisitCXXTypeidExpr(CXXTypeidExpr *E) {
1708  if (E->isTypeOperand()) {
1709    if (TypeSourceInfo *TSInfo = E->getTypeOperandSourceInfo())
1710      return Visit(TSInfo->getTypeLoc());
1711
1712    return false;
1713  }
1714
1715  return VisitExpr(E);
1716}
1717
1718bool CursorVisitor::VisitCXXUuidofExpr(CXXUuidofExpr *E) {
1719  if (E->isTypeOperand()) {
1720    if (TypeSourceInfo *TSInfo = E->getTypeOperandSourceInfo())
1721      return Visit(TSInfo->getTypeLoc());
1722
1723    return false;
1724  }
1725
1726  return VisitExpr(E);
1727}
1728
1729bool CursorVisitor::VisitCXXTemporaryObjectExpr(CXXTemporaryObjectExpr *E) {
1730  if (TypeSourceInfo *TSInfo = E->getTypeSourceInfo())
1731    return Visit(TSInfo->getTypeLoc());
1732
1733  return VisitExpr(E);
1734}
1735
1736bool CursorVisitor::VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E) {
1737  if (TypeSourceInfo *TSInfo = E->getTypeSourceInfo())
1738    return Visit(TSInfo->getTypeLoc());
1739
1740  return false;
1741}
1742
1743bool CursorVisitor::VisitCXXNewExpr(CXXNewExpr *E) {
1744  // Visit placement arguments.
1745  for (unsigned I = 0, N = E->getNumPlacementArgs(); I != N; ++I)
1746    if (Visit(MakeCXCursor(E->getPlacementArg(I), StmtParent, TU)))
1747      return true;
1748
1749  // Visit the allocated type.
1750  if (TypeSourceInfo *TSInfo = E->getAllocatedTypeSourceInfo())
1751    if (Visit(TSInfo->getTypeLoc()))
1752      return true;
1753
1754  // Visit the array size, if any.
1755  if (E->isArray() && Visit(MakeCXCursor(E->getArraySize(), StmtParent, TU)))
1756    return true;
1757
1758  // Visit the initializer or constructor arguments.
1759  for (unsigned I = 0, N = E->getNumConstructorArgs(); I != N; ++I)
1760    if (Visit(MakeCXCursor(E->getConstructorArg(I), StmtParent, TU)))
1761      return true;
1762
1763  return false;
1764}
1765
1766bool CursorVisitor::VisitCXXPseudoDestructorExpr(CXXPseudoDestructorExpr *E) {
1767  // Visit base expression.
1768  if (Visit(MakeCXCursor(E->getBase(), StmtParent, TU)))
1769    return true;
1770
1771  // Visit the nested-name-specifier.
1772  if (NestedNameSpecifier *Qualifier = E->getQualifier())
1773    if (VisitNestedNameSpecifier(Qualifier, E->getQualifierRange()))
1774      return true;
1775
1776  // Visit the scope type that looks disturbingly like the nested-name-specifier
1777  // but isn't.
1778  if (TypeSourceInfo *TSInfo = E->getScopeTypeInfo())
1779    if (Visit(TSInfo->getTypeLoc()))
1780      return true;
1781
1782  // Visit the name of the type being destroyed.
1783  if (TypeSourceInfo *TSInfo = E->getDestroyedTypeInfo())
1784    if (Visit(TSInfo->getTypeLoc()))
1785      return true;
1786
1787  return false;
1788}
1789
1790bool CursorVisitor::VisitUnaryTypeTraitExpr(UnaryTypeTraitExpr *E) {
1791  return Visit(E->getQueriedTypeSourceInfo()->getTypeLoc());
1792}
1793
1794bool CursorVisitor::VisitOverloadExpr(OverloadExpr *E) {
1795  // Visit the nested-name-specifier.
1796  if (NestedNameSpecifier *Qualifier = E->getQualifier())
1797    if (VisitNestedNameSpecifier(Qualifier, E->getQualifierRange()))
1798      return true;
1799
1800  // Visit the declaration name.
1801  if (VisitDeclarationNameInfo(E->getNameInfo()))
1802    return true;
1803
1804  // Visit the overloaded declaration reference.
1805  if (Visit(MakeCursorOverloadedDeclRef(E, TU)))
1806    return true;
1807
1808  // Visit the explicitly-specified template arguments.
1809  if (const ExplicitTemplateArgumentList *ArgList
1810                                      = E->getOptionalExplicitTemplateArgs()) {
1811    for (const TemplateArgumentLoc *Arg = ArgList->getTemplateArgs(),
1812                                *ArgEnd = Arg + ArgList->NumTemplateArgs;
1813         Arg != ArgEnd; ++Arg) {
1814      if (VisitTemplateArgumentLoc(*Arg))
1815        return true;
1816    }
1817  }
1818
1819  return false;
1820}
1821
1822bool CursorVisitor::VisitDependentScopeDeclRefExpr(
1823                                                DependentScopeDeclRefExpr *E) {
1824  // Visit the nested-name-specifier.
1825  if (NestedNameSpecifier *Qualifier = E->getQualifier())
1826    if (VisitNestedNameSpecifier(Qualifier, E->getQualifierRange()))
1827      return true;
1828
1829  // Visit the declaration name.
1830  if (VisitDeclarationNameInfo(E->getNameInfo()))
1831    return true;
1832
1833  // Visit the explicitly-specified template arguments.
1834  if (const ExplicitTemplateArgumentList *ArgList
1835      = E->getOptionalExplicitTemplateArgs()) {
1836    for (const TemplateArgumentLoc *Arg = ArgList->getTemplateArgs(),
1837         *ArgEnd = Arg + ArgList->NumTemplateArgs;
1838         Arg != ArgEnd; ++Arg) {
1839      if (VisitTemplateArgumentLoc(*Arg))
1840        return true;
1841    }
1842  }
1843
1844  return false;
1845}
1846
1847bool CursorVisitor::VisitCXXUnresolvedConstructExpr(
1848                                                CXXUnresolvedConstructExpr *E) {
1849  if (TypeSourceInfo *TSInfo = E->getTypeSourceInfo())
1850    if (Visit(TSInfo->getTypeLoc()))
1851      return true;
1852
1853  return VisitExpr(E);
1854}
1855
1856bool CursorVisitor::VisitCXXDependentScopeMemberExpr(
1857                                              CXXDependentScopeMemberExpr *E) {
1858  // Visit the base expression, if there is one.
1859  if (!E->isImplicitAccess() &&
1860      Visit(MakeCXCursor(E->getBase(), StmtParent, TU)))
1861    return true;
1862
1863  // Visit the nested-name-specifier.
1864  if (NestedNameSpecifier *Qualifier = E->getQualifier())
1865    if (VisitNestedNameSpecifier(Qualifier, E->getQualifierRange()))
1866      return true;
1867
1868  // Visit the declaration name.
1869  if (VisitDeclarationNameInfo(E->getMemberNameInfo()))
1870    return true;
1871
1872  // Visit the explicitly-specified template arguments.
1873  if (const ExplicitTemplateArgumentList *ArgList
1874      = E->getOptionalExplicitTemplateArgs()) {
1875    for (const TemplateArgumentLoc *Arg = ArgList->getTemplateArgs(),
1876         *ArgEnd = Arg + ArgList->NumTemplateArgs;
1877         Arg != ArgEnd; ++Arg) {
1878      if (VisitTemplateArgumentLoc(*Arg))
1879        return true;
1880    }
1881  }
1882
1883  return false;
1884}
1885
1886bool CursorVisitor::VisitUnresolvedMemberExpr(UnresolvedMemberExpr *E) {
1887  // Visit the base expression, if there is one.
1888  if (!E->isImplicitAccess() &&
1889      Visit(MakeCXCursor(E->getBase(), StmtParent, TU)))
1890    return true;
1891
1892  return VisitOverloadExpr(E);
1893}
1894
1895bool CursorVisitor::VisitObjCMessageExpr(ObjCMessageExpr *E) {
1896  if (TypeSourceInfo *TSInfo = E->getClassReceiverTypeInfo())
1897    if (Visit(TSInfo->getTypeLoc()))
1898      return true;
1899
1900  return VisitExpr(E);
1901}
1902
1903bool CursorVisitor::VisitObjCEncodeExpr(ObjCEncodeExpr *E) {
1904  return Visit(E->getEncodedTypeSourceInfo()->getTypeLoc());
1905}
1906
1907
1908bool CursorVisitor::VisitAttributes(Decl *D) {
1909  for (AttrVec::const_iterator i = D->attr_begin(), e = D->attr_end();
1910       i != e; ++i)
1911    if (Visit(MakeCXCursor(*i, D, TU)))
1912        return true;
1913
1914  return false;
1915}
1916
1917static llvm::sys::Mutex EnableMultithreadingMutex;
1918static bool EnabledMultithreading;
1919
1920extern "C" {
1921CXIndex clang_createIndex(int excludeDeclarationsFromPCH,
1922                          int displayDiagnostics) {
1923  // Disable pretty stack trace functionality, which will otherwise be a very
1924  // poor citizen of the world and set up all sorts of signal handlers.
1925  llvm::DisablePrettyStackTrace = true;
1926
1927  // We use crash recovery to make some of our APIs more reliable, implicitly
1928  // enable it.
1929  llvm::CrashRecoveryContext::Enable();
1930
1931  // Enable support for multithreading in LLVM.
1932  {
1933    llvm::sys::ScopedLock L(EnableMultithreadingMutex);
1934    if (!EnabledMultithreading) {
1935      llvm::llvm_start_multithreaded();
1936      EnabledMultithreading = true;
1937    }
1938  }
1939
1940  CIndexer *CIdxr = new CIndexer();
1941  if (excludeDeclarationsFromPCH)
1942    CIdxr->setOnlyLocalDecls();
1943  if (displayDiagnostics)
1944    CIdxr->setDisplayDiagnostics();
1945  return CIdxr;
1946}
1947
1948void clang_disposeIndex(CXIndex CIdx) {
1949  if (CIdx)
1950    delete static_cast<CIndexer *>(CIdx);
1951}
1952
1953CXTranslationUnit clang_createTranslationUnit(CXIndex CIdx,
1954                                              const char *ast_filename) {
1955  if (!CIdx)
1956    return 0;
1957
1958  CIndexer *CXXIdx = static_cast<CIndexer *>(CIdx);
1959
1960  llvm::IntrusiveRefCntPtr<Diagnostic> Diags;
1961  return ASTUnit::LoadFromASTFile(ast_filename, Diags,
1962                                  CXXIdx->getOnlyLocalDecls(),
1963                                  0, 0, true);
1964}
1965
1966unsigned clang_defaultEditingTranslationUnitOptions() {
1967  return CXTranslationUnit_PrecompiledPreamble |
1968         CXTranslationUnit_CacheCompletionResults;
1969}
1970
1971CXTranslationUnit
1972clang_createTranslationUnitFromSourceFile(CXIndex CIdx,
1973                                          const char *source_filename,
1974                                          int num_command_line_args,
1975                                          const char * const *command_line_args,
1976                                          unsigned num_unsaved_files,
1977                                          struct CXUnsavedFile *unsaved_files) {
1978  return clang_parseTranslationUnit(CIdx, source_filename,
1979                                    command_line_args, num_command_line_args,
1980                                    unsaved_files, num_unsaved_files,
1981                                 CXTranslationUnit_DetailedPreprocessingRecord);
1982}
1983
1984struct ParseTranslationUnitInfo {
1985  CXIndex CIdx;
1986  const char *source_filename;
1987  const char *const *command_line_args;
1988  int num_command_line_args;
1989  struct CXUnsavedFile *unsaved_files;
1990  unsigned num_unsaved_files;
1991  unsigned options;
1992  CXTranslationUnit result;
1993};
1994static void clang_parseTranslationUnit_Impl(void *UserData) {
1995  ParseTranslationUnitInfo *PTUI =
1996    static_cast<ParseTranslationUnitInfo*>(UserData);
1997  CXIndex CIdx = PTUI->CIdx;
1998  const char *source_filename = PTUI->source_filename;
1999  const char * const *command_line_args = PTUI->command_line_args;
2000  int num_command_line_args = PTUI->num_command_line_args;
2001  struct CXUnsavedFile *unsaved_files = PTUI->unsaved_files;
2002  unsigned num_unsaved_files = PTUI->num_unsaved_files;
2003  unsigned options = PTUI->options;
2004  PTUI->result = 0;
2005
2006  if (!CIdx)
2007    return;
2008
2009  CIndexer *CXXIdx = static_cast<CIndexer *>(CIdx);
2010
2011  bool PrecompilePreamble = options & CXTranslationUnit_PrecompiledPreamble;
2012  bool CompleteTranslationUnit
2013    = ((options & CXTranslationUnit_Incomplete) == 0);
2014  bool CacheCodeCompetionResults
2015    = options & CXTranslationUnit_CacheCompletionResults;
2016
2017  // Configure the diagnostics.
2018  DiagnosticOptions DiagOpts;
2019  llvm::IntrusiveRefCntPtr<Diagnostic> Diags;
2020  Diags = CompilerInstance::createDiagnostics(DiagOpts, 0, 0);
2021
2022  llvm::SmallVector<ASTUnit::RemappedFile, 4> RemappedFiles;
2023  for (unsigned I = 0; I != num_unsaved_files; ++I) {
2024    llvm::StringRef Data(unsaved_files[I].Contents, unsaved_files[I].Length);
2025    const llvm::MemoryBuffer *Buffer
2026      = llvm::MemoryBuffer::getMemBufferCopy(Data, unsaved_files[I].Filename);
2027    RemappedFiles.push_back(std::make_pair(unsaved_files[I].Filename,
2028                                           Buffer));
2029  }
2030
2031  llvm::SmallVector<const char *, 16> Args;
2032
2033  // The 'source_filename' argument is optional.  If the caller does not
2034  // specify it then it is assumed that the source file is specified
2035  // in the actual argument list.
2036  if (source_filename)
2037    Args.push_back(source_filename);
2038
2039  // Since the Clang C library is primarily used by batch tools dealing with
2040  // (often very broken) source code, where spell-checking can have a
2041  // significant negative impact on performance (particularly when
2042  // precompiled headers are involved), we disable it by default.
2043  // Only do this if we haven't found a spell-checking-related argument.
2044  bool FoundSpellCheckingArgument = false;
2045  for (int I = 0; I != num_command_line_args; ++I) {
2046    if (strcmp(command_line_args[I], "-fno-spell-checking") == 0 ||
2047        strcmp(command_line_args[I], "-fspell-checking") == 0) {
2048      FoundSpellCheckingArgument = true;
2049      break;
2050    }
2051  }
2052  if (!FoundSpellCheckingArgument)
2053    Args.push_back("-fno-spell-checking");
2054
2055  Args.insert(Args.end(), command_line_args,
2056              command_line_args + num_command_line_args);
2057
2058  // Do we need the detailed preprocessing record?
2059  if (options & CXTranslationUnit_DetailedPreprocessingRecord) {
2060    Args.push_back("-Xclang");
2061    Args.push_back("-detailed-preprocessing-record");
2062  }
2063
2064  unsigned NumErrors = Diags->getNumErrors();
2065
2066#ifdef USE_CRASHTRACER
2067  ArgsCrashTracerInfo ACTI(Args);
2068#endif
2069
2070  llvm::OwningPtr<ASTUnit> Unit(
2071    ASTUnit::LoadFromCommandLine(Args.data(), Args.data() + Args.size(),
2072                                 Diags,
2073                                 CXXIdx->getClangResourcesPath(),
2074                                 CXXIdx->getOnlyLocalDecls(),
2075                                 RemappedFiles.data(),
2076                                 RemappedFiles.size(),
2077                                 /*CaptureDiagnostics=*/true,
2078                                 PrecompilePreamble,
2079                                 CompleteTranslationUnit,
2080                                 CacheCodeCompetionResults));
2081
2082  if (NumErrors != Diags->getNumErrors()) {
2083    // Make sure to check that 'Unit' is non-NULL.
2084    if (CXXIdx->getDisplayDiagnostics() && Unit.get()) {
2085      for (ASTUnit::stored_diag_iterator D = Unit->stored_diag_begin(),
2086                                      DEnd = Unit->stored_diag_end();
2087           D != DEnd; ++D) {
2088        CXStoredDiagnostic Diag(*D, Unit->getASTContext().getLangOptions());
2089        CXString Msg = clang_formatDiagnostic(&Diag,
2090                                    clang_defaultDiagnosticDisplayOptions());
2091        fprintf(stderr, "%s\n", clang_getCString(Msg));
2092        clang_disposeString(Msg);
2093      }
2094#ifdef LLVM_ON_WIN32
2095      // On Windows, force a flush, since there may be multiple copies of
2096      // stderr and stdout in the file system, all with different buffers
2097      // but writing to the same device.
2098      fflush(stderr);
2099#endif
2100    }
2101  }
2102
2103  PTUI->result = Unit.take();
2104}
2105CXTranslationUnit clang_parseTranslationUnit(CXIndex CIdx,
2106                                             const char *source_filename,
2107                                         const char * const *command_line_args,
2108                                             int num_command_line_args,
2109                                             struct CXUnsavedFile *unsaved_files,
2110                                             unsigned num_unsaved_files,
2111                                             unsigned options) {
2112  ParseTranslationUnitInfo PTUI = { CIdx, source_filename, command_line_args,
2113                                    num_command_line_args, unsaved_files, num_unsaved_files,
2114                                    options, 0 };
2115  llvm::CrashRecoveryContext CRC;
2116
2117  if (!CRC.RunSafely(clang_parseTranslationUnit_Impl, &PTUI)) {
2118    fprintf(stderr, "libclang: crash detected during parsing: {\n");
2119    fprintf(stderr, "  'source_filename' : '%s'\n", source_filename);
2120    fprintf(stderr, "  'command_line_args' : [");
2121    for (int i = 0; i != num_command_line_args; ++i) {
2122      if (i)
2123        fprintf(stderr, ", ");
2124      fprintf(stderr, "'%s'", command_line_args[i]);
2125    }
2126    fprintf(stderr, "],\n");
2127    fprintf(stderr, "  'unsaved_files' : [");
2128    for (unsigned i = 0; i != num_unsaved_files; ++i) {
2129      if (i)
2130        fprintf(stderr, ", ");
2131      fprintf(stderr, "('%s', '...', %ld)", unsaved_files[i].Filename,
2132              unsaved_files[i].Length);
2133    }
2134    fprintf(stderr, "],\n");
2135    fprintf(stderr, "  'options' : %d,\n", options);
2136    fprintf(stderr, "}\n");
2137
2138    return 0;
2139  }
2140
2141  return PTUI.result;
2142}
2143
2144unsigned clang_defaultSaveOptions(CXTranslationUnit TU) {
2145  return CXSaveTranslationUnit_None;
2146}
2147
2148int clang_saveTranslationUnit(CXTranslationUnit TU, const char *FileName,
2149                              unsigned options) {
2150  if (!TU)
2151    return 1;
2152
2153  return static_cast<ASTUnit *>(TU)->Save(FileName);
2154}
2155
2156void clang_disposeTranslationUnit(CXTranslationUnit CTUnit) {
2157  if (CTUnit) {
2158    // If the translation unit has been marked as unsafe to free, just discard
2159    // it.
2160    if (static_cast<ASTUnit *>(CTUnit)->isUnsafeToFree())
2161      return;
2162
2163    delete static_cast<ASTUnit *>(CTUnit);
2164  }
2165}
2166
2167unsigned clang_defaultReparseOptions(CXTranslationUnit TU) {
2168  return CXReparse_None;
2169}
2170
2171struct ReparseTranslationUnitInfo {
2172  CXTranslationUnit TU;
2173  unsigned num_unsaved_files;
2174  struct CXUnsavedFile *unsaved_files;
2175  unsigned options;
2176  int result;
2177};
2178
2179static void clang_reparseTranslationUnit_Impl(void *UserData) {
2180  ReparseTranslationUnitInfo *RTUI =
2181    static_cast<ReparseTranslationUnitInfo*>(UserData);
2182  CXTranslationUnit TU = RTUI->TU;
2183  unsigned num_unsaved_files = RTUI->num_unsaved_files;
2184  struct CXUnsavedFile *unsaved_files = RTUI->unsaved_files;
2185  unsigned options = RTUI->options;
2186  (void) options;
2187  RTUI->result = 1;
2188
2189  if (!TU)
2190    return;
2191
2192  ASTUnit *CXXUnit = static_cast<ASTUnit *>(TU);
2193  ASTUnit::ConcurrencyCheck Check(*CXXUnit);
2194
2195  llvm::SmallVector<ASTUnit::RemappedFile, 4> RemappedFiles;
2196  for (unsigned I = 0; I != num_unsaved_files; ++I) {
2197    llvm::StringRef Data(unsaved_files[I].Contents, unsaved_files[I].Length);
2198    const llvm::MemoryBuffer *Buffer
2199      = llvm::MemoryBuffer::getMemBufferCopy(Data, unsaved_files[I].Filename);
2200    RemappedFiles.push_back(std::make_pair(unsaved_files[I].Filename,
2201                                           Buffer));
2202  }
2203
2204  if (!CXXUnit->Reparse(RemappedFiles.data(), RemappedFiles.size()))
2205    RTUI->result = 0;
2206}
2207
2208int clang_reparseTranslationUnit(CXTranslationUnit TU,
2209                                 unsigned num_unsaved_files,
2210                                 struct CXUnsavedFile *unsaved_files,
2211                                 unsigned options) {
2212  ReparseTranslationUnitInfo RTUI = { TU, num_unsaved_files, unsaved_files,
2213                                      options, 0 };
2214  llvm::CrashRecoveryContext CRC;
2215
2216  if (!CRC.RunSafely(clang_reparseTranslationUnit_Impl, &RTUI)) {
2217    fprintf(stderr, "libclang: crash detected during reparsing\n");
2218    static_cast<ASTUnit *>(TU)->setUnsafeToFree(true);
2219    return 1;
2220  }
2221
2222  return RTUI.result;
2223}
2224
2225
2226CXString clang_getTranslationUnitSpelling(CXTranslationUnit CTUnit) {
2227  if (!CTUnit)
2228    return createCXString("");
2229
2230  ASTUnit *CXXUnit = static_cast<ASTUnit *>(CTUnit);
2231  return createCXString(CXXUnit->getOriginalSourceFileName(), true);
2232}
2233
2234CXCursor clang_getTranslationUnitCursor(CXTranslationUnit TU) {
2235  CXCursor Result = { CXCursor_TranslationUnit, { 0, 0, TU } };
2236  return Result;
2237}
2238
2239} // end: extern "C"
2240
2241//===----------------------------------------------------------------------===//
2242// CXSourceLocation and CXSourceRange Operations.
2243//===----------------------------------------------------------------------===//
2244
2245extern "C" {
2246CXSourceLocation clang_getNullLocation() {
2247  CXSourceLocation Result = { { 0, 0 }, 0 };
2248  return Result;
2249}
2250
2251unsigned clang_equalLocations(CXSourceLocation loc1, CXSourceLocation loc2) {
2252  return (loc1.ptr_data[0] == loc2.ptr_data[0] &&
2253          loc1.ptr_data[1] == loc2.ptr_data[1] &&
2254          loc1.int_data == loc2.int_data);
2255}
2256
2257CXSourceLocation clang_getLocation(CXTranslationUnit tu,
2258                                   CXFile file,
2259                                   unsigned line,
2260                                   unsigned column) {
2261  if (!tu || !file)
2262    return clang_getNullLocation();
2263
2264  ASTUnit *CXXUnit = static_cast<ASTUnit *>(tu);
2265  SourceLocation SLoc
2266    = CXXUnit->getSourceManager().getLocation(
2267                                        static_cast<const FileEntry *>(file),
2268                                              line, column);
2269  if (SLoc.isInvalid()) return clang_getNullLocation();
2270
2271  return cxloc::translateSourceLocation(CXXUnit->getASTContext(), SLoc);
2272}
2273
2274CXSourceLocation clang_getLocationForOffset(CXTranslationUnit tu,
2275                                            CXFile file,
2276                                            unsigned offset) {
2277  if (!tu || !file)
2278    return clang_getNullLocation();
2279
2280  ASTUnit *CXXUnit = static_cast<ASTUnit *>(tu);
2281  SourceLocation Start
2282    = CXXUnit->getSourceManager().getLocation(
2283                                        static_cast<const FileEntry *>(file),
2284                                              1, 1);
2285  if (Start.isInvalid()) return clang_getNullLocation();
2286
2287  SourceLocation SLoc = Start.getFileLocWithOffset(offset);
2288
2289  if (SLoc.isInvalid()) return clang_getNullLocation();
2290
2291  return cxloc::translateSourceLocation(CXXUnit->getASTContext(), SLoc);
2292}
2293
2294CXSourceRange clang_getNullRange() {
2295  CXSourceRange Result = { { 0, 0 }, 0, 0 };
2296  return Result;
2297}
2298
2299CXSourceRange clang_getRange(CXSourceLocation begin, CXSourceLocation end) {
2300  if (begin.ptr_data[0] != end.ptr_data[0] ||
2301      begin.ptr_data[1] != end.ptr_data[1])
2302    return clang_getNullRange();
2303
2304  CXSourceRange Result = { { begin.ptr_data[0], begin.ptr_data[1] },
2305                           begin.int_data, end.int_data };
2306  return Result;
2307}
2308
2309void clang_getInstantiationLocation(CXSourceLocation location,
2310                                    CXFile *file,
2311                                    unsigned *line,
2312                                    unsigned *column,
2313                                    unsigned *offset) {
2314  SourceLocation Loc = SourceLocation::getFromRawEncoding(location.int_data);
2315
2316  if (!location.ptr_data[0] || Loc.isInvalid()) {
2317    if (file)
2318      *file = 0;
2319    if (line)
2320      *line = 0;
2321    if (column)
2322      *column = 0;
2323    if (offset)
2324      *offset = 0;
2325    return;
2326  }
2327
2328  const SourceManager &SM =
2329    *static_cast<const SourceManager*>(location.ptr_data[0]);
2330  SourceLocation InstLoc = SM.getInstantiationLoc(Loc);
2331
2332  if (file)
2333    *file = (void *)SM.getFileEntryForID(SM.getFileID(InstLoc));
2334  if (line)
2335    *line = SM.getInstantiationLineNumber(InstLoc);
2336  if (column)
2337    *column = SM.getInstantiationColumnNumber(InstLoc);
2338  if (offset)
2339    *offset = SM.getDecomposedLoc(InstLoc).second;
2340}
2341
2342CXSourceLocation clang_getRangeStart(CXSourceRange range) {
2343  CXSourceLocation Result = { { range.ptr_data[0], range.ptr_data[1] },
2344                              range.begin_int_data };
2345  return Result;
2346}
2347
2348CXSourceLocation clang_getRangeEnd(CXSourceRange range) {
2349  CXSourceLocation Result = { { range.ptr_data[0], range.ptr_data[1] },
2350                              range.end_int_data };
2351  return Result;
2352}
2353
2354} // end: extern "C"
2355
2356//===----------------------------------------------------------------------===//
2357// CXFile Operations.
2358//===----------------------------------------------------------------------===//
2359
2360extern "C" {
2361CXString clang_getFileName(CXFile SFile) {
2362  if (!SFile)
2363    return createCXString(NULL);
2364
2365  FileEntry *FEnt = static_cast<FileEntry *>(SFile);
2366  return createCXString(FEnt->getName());
2367}
2368
2369time_t clang_getFileTime(CXFile SFile) {
2370  if (!SFile)
2371    return 0;
2372
2373  FileEntry *FEnt = static_cast<FileEntry *>(SFile);
2374  return FEnt->getModificationTime();
2375}
2376
2377CXFile clang_getFile(CXTranslationUnit tu, const char *file_name) {
2378  if (!tu)
2379    return 0;
2380
2381  ASTUnit *CXXUnit = static_cast<ASTUnit *>(tu);
2382
2383  FileManager &FMgr = CXXUnit->getFileManager();
2384  const FileEntry *File = FMgr.getFile(file_name, file_name+strlen(file_name));
2385  return const_cast<FileEntry *>(File);
2386}
2387
2388} // end: extern "C"
2389
2390//===----------------------------------------------------------------------===//
2391// CXCursor Operations.
2392//===----------------------------------------------------------------------===//
2393
2394static Decl *getDeclFromExpr(Stmt *E) {
2395  if (CastExpr *CE = dyn_cast<CastExpr>(E))
2396    return getDeclFromExpr(CE->getSubExpr());
2397
2398  if (DeclRefExpr *RefExpr = dyn_cast<DeclRefExpr>(E))
2399    return RefExpr->getDecl();
2400  if (MemberExpr *ME = dyn_cast<MemberExpr>(E))
2401    return ME->getMemberDecl();
2402  if (ObjCIvarRefExpr *RE = dyn_cast<ObjCIvarRefExpr>(E))
2403    return RE->getDecl();
2404  if (ObjCPropertyRefExpr *PRE = dyn_cast<ObjCPropertyRefExpr>(E))
2405    return PRE->getProperty();
2406
2407  if (CallExpr *CE = dyn_cast<CallExpr>(E))
2408    return getDeclFromExpr(CE->getCallee());
2409  if (ObjCMessageExpr *OME = dyn_cast<ObjCMessageExpr>(E))
2410    return OME->getMethodDecl();
2411
2412  if (ObjCProtocolExpr *PE = dyn_cast<ObjCProtocolExpr>(E))
2413    return PE->getProtocol();
2414
2415  return 0;
2416}
2417
2418static SourceLocation getLocationFromExpr(Expr *E) {
2419  if (ObjCMessageExpr *Msg = dyn_cast<ObjCMessageExpr>(E))
2420    return /*FIXME:*/Msg->getLeftLoc();
2421  if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
2422    return DRE->getLocation();
2423  if (MemberExpr *Member = dyn_cast<MemberExpr>(E))
2424    return Member->getMemberLoc();
2425  if (ObjCIvarRefExpr *Ivar = dyn_cast<ObjCIvarRefExpr>(E))
2426    return Ivar->getLocation();
2427  return E->getLocStart();
2428}
2429
2430extern "C" {
2431
2432unsigned clang_visitChildren(CXCursor parent,
2433                             CXCursorVisitor visitor,
2434                             CXClientData client_data) {
2435  ASTUnit *CXXUnit = getCursorASTUnit(parent);
2436
2437  CursorVisitor CursorVis(CXXUnit, visitor, client_data,
2438                          CXXUnit->getMaxPCHLevel());
2439  return CursorVis.VisitChildren(parent);
2440}
2441
2442static CXString getDeclSpelling(Decl *D) {
2443  NamedDecl *ND = dyn_cast_or_null<NamedDecl>(D);
2444  if (!ND)
2445    return createCXString("");
2446
2447  if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(ND))
2448    return createCXString(OMD->getSelector().getAsString());
2449
2450  if (ObjCCategoryImplDecl *CIMP = dyn_cast<ObjCCategoryImplDecl>(ND))
2451    // No, this isn't the same as the code below. getIdentifier() is non-virtual
2452    // and returns different names. NamedDecl returns the class name and
2453    // ObjCCategoryImplDecl returns the category name.
2454    return createCXString(CIMP->getIdentifier()->getNameStart());
2455
2456  if (isa<UsingDirectiveDecl>(D))
2457    return createCXString("");
2458
2459  llvm::SmallString<1024> S;
2460  llvm::raw_svector_ostream os(S);
2461  ND->printName(os);
2462
2463  return createCXString(os.str());
2464}
2465
2466CXString clang_getCursorSpelling(CXCursor C) {
2467  if (clang_isTranslationUnit(C.kind))
2468    return clang_getTranslationUnitSpelling(C.data[2]);
2469
2470  if (clang_isReference(C.kind)) {
2471    switch (C.kind) {
2472    case CXCursor_ObjCSuperClassRef: {
2473      ObjCInterfaceDecl *Super = getCursorObjCSuperClassRef(C).first;
2474      return createCXString(Super->getIdentifier()->getNameStart());
2475    }
2476    case CXCursor_ObjCClassRef: {
2477      ObjCInterfaceDecl *Class = getCursorObjCClassRef(C).first;
2478      return createCXString(Class->getIdentifier()->getNameStart());
2479    }
2480    case CXCursor_ObjCProtocolRef: {
2481      ObjCProtocolDecl *OID = getCursorObjCProtocolRef(C).first;
2482      assert(OID && "getCursorSpelling(): Missing protocol decl");
2483      return createCXString(OID->getIdentifier()->getNameStart());
2484    }
2485    case CXCursor_CXXBaseSpecifier: {
2486      CXXBaseSpecifier *B = getCursorCXXBaseSpecifier(C);
2487      return createCXString(B->getType().getAsString());
2488    }
2489    case CXCursor_TypeRef: {
2490      TypeDecl *Type = getCursorTypeRef(C).first;
2491      assert(Type && "Missing type decl");
2492
2493      return createCXString(getCursorContext(C).getTypeDeclType(Type).
2494                              getAsString());
2495    }
2496    case CXCursor_TemplateRef: {
2497      TemplateDecl *Template = getCursorTemplateRef(C).first;
2498      assert(Template && "Missing template decl");
2499
2500      return createCXString(Template->getNameAsString());
2501    }
2502
2503    case CXCursor_NamespaceRef: {
2504      NamedDecl *NS = getCursorNamespaceRef(C).first;
2505      assert(NS && "Missing namespace decl");
2506
2507      return createCXString(NS->getNameAsString());
2508    }
2509
2510    case CXCursor_MemberRef: {
2511      FieldDecl *Field = getCursorMemberRef(C).first;
2512      assert(Field && "Missing member decl");
2513
2514      return createCXString(Field->getNameAsString());
2515    }
2516
2517    case CXCursor_LabelRef: {
2518      LabelStmt *Label = getCursorLabelRef(C).first;
2519      assert(Label && "Missing label");
2520
2521      return createCXString(Label->getID()->getName());
2522    }
2523
2524    case CXCursor_OverloadedDeclRef: {
2525      OverloadedDeclRefStorage Storage = getCursorOverloadedDeclRef(C).first;
2526      if (Decl *D = Storage.dyn_cast<Decl *>()) {
2527        if (NamedDecl *ND = dyn_cast<NamedDecl>(D))
2528          return createCXString(ND->getNameAsString());
2529        return createCXString("");
2530      }
2531      if (OverloadExpr *E = Storage.dyn_cast<OverloadExpr *>())
2532        return createCXString(E->getName().getAsString());
2533      OverloadedTemplateStorage *Ovl
2534        = Storage.get<OverloadedTemplateStorage*>();
2535      if (Ovl->size() == 0)
2536        return createCXString("");
2537      return createCXString((*Ovl->begin())->getNameAsString());
2538    }
2539
2540    default:
2541      return createCXString("<not implemented>");
2542    }
2543  }
2544
2545  if (clang_isExpression(C.kind)) {
2546    Decl *D = getDeclFromExpr(getCursorExpr(C));
2547    if (D)
2548      return getDeclSpelling(D);
2549    return createCXString("");
2550  }
2551
2552  if (clang_isStatement(C.kind)) {
2553    Stmt *S = getCursorStmt(C);
2554    if (LabelStmt *Label = dyn_cast_or_null<LabelStmt>(S))
2555      return createCXString(Label->getID()->getName());
2556
2557    return createCXString("");
2558  }
2559
2560  if (C.kind == CXCursor_MacroInstantiation)
2561    return createCXString(getCursorMacroInstantiation(C)->getName()
2562                                                           ->getNameStart());
2563
2564  if (C.kind == CXCursor_MacroDefinition)
2565    return createCXString(getCursorMacroDefinition(C)->getName()
2566                                                           ->getNameStart());
2567
2568  if (clang_isDeclaration(C.kind))
2569    return getDeclSpelling(getCursorDecl(C));
2570
2571  return createCXString("");
2572}
2573
2574CXString clang_getCursorDisplayName(CXCursor C) {
2575  if (!clang_isDeclaration(C.kind))
2576    return clang_getCursorSpelling(C);
2577
2578  Decl *D = getCursorDecl(C);
2579  if (!D)
2580    return createCXString("");
2581
2582  PrintingPolicy &Policy = getCursorContext(C).PrintingPolicy;
2583  if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D))
2584    D = FunTmpl->getTemplatedDecl();
2585
2586  if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) {
2587    llvm::SmallString<64> Str;
2588    llvm::raw_svector_ostream OS(Str);
2589    OS << Function->getNameAsString();
2590    if (Function->getPrimaryTemplate())
2591      OS << "<>";
2592    OS << "(";
2593    for (unsigned I = 0, N = Function->getNumParams(); I != N; ++I) {
2594      if (I)
2595        OS << ", ";
2596      OS << Function->getParamDecl(I)->getType().getAsString(Policy);
2597    }
2598
2599    if (Function->isVariadic()) {
2600      if (Function->getNumParams())
2601        OS << ", ";
2602      OS << "...";
2603    }
2604    OS << ")";
2605    return createCXString(OS.str());
2606  }
2607
2608  if (ClassTemplateDecl *ClassTemplate = dyn_cast<ClassTemplateDecl>(D)) {
2609    llvm::SmallString<64> Str;
2610    llvm::raw_svector_ostream OS(Str);
2611    OS << ClassTemplate->getNameAsString();
2612    OS << "<";
2613    TemplateParameterList *Params = ClassTemplate->getTemplateParameters();
2614    for (unsigned I = 0, N = Params->size(); I != N; ++I) {
2615      if (I)
2616        OS << ", ";
2617
2618      NamedDecl *Param = Params->getParam(I);
2619      if (Param->getIdentifier()) {
2620        OS << Param->getIdentifier()->getName();
2621        continue;
2622      }
2623
2624      // There is no parameter name, which makes this tricky. Try to come up
2625      // with something useful that isn't too long.
2626      if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Param))
2627        OS << (TTP->wasDeclaredWithTypename()? "typename" : "class");
2628      else if (NonTypeTemplateParmDecl *NTTP
2629                                    = dyn_cast<NonTypeTemplateParmDecl>(Param))
2630        OS << NTTP->getType().getAsString(Policy);
2631      else
2632        OS << "template<...> class";
2633    }
2634
2635    OS << ">";
2636    return createCXString(OS.str());
2637  }
2638
2639  if (ClassTemplateSpecializationDecl *ClassSpec
2640                              = dyn_cast<ClassTemplateSpecializationDecl>(D)) {
2641    // If the type was explicitly written, use that.
2642    if (TypeSourceInfo *TSInfo = ClassSpec->getTypeAsWritten())
2643      return createCXString(TSInfo->getType().getAsString(Policy));
2644
2645    llvm::SmallString<64> Str;
2646    llvm::raw_svector_ostream OS(Str);
2647    OS << ClassSpec->getNameAsString();
2648    OS << TemplateSpecializationType::PrintTemplateArgumentList(
2649                            ClassSpec->getTemplateArgs().getFlatArgumentList(),
2650                                      ClassSpec->getTemplateArgs().flat_size(),
2651                                                                Policy);
2652    return createCXString(OS.str());
2653  }
2654
2655  return clang_getCursorSpelling(C);
2656}
2657
2658CXString clang_getCursorKindSpelling(enum CXCursorKind Kind) {
2659  switch (Kind) {
2660  case CXCursor_FunctionDecl:
2661      return createCXString("FunctionDecl");
2662  case CXCursor_TypedefDecl:
2663      return createCXString("TypedefDecl");
2664  case CXCursor_EnumDecl:
2665      return createCXString("EnumDecl");
2666  case CXCursor_EnumConstantDecl:
2667      return createCXString("EnumConstantDecl");
2668  case CXCursor_StructDecl:
2669      return createCXString("StructDecl");
2670  case CXCursor_UnionDecl:
2671      return createCXString("UnionDecl");
2672  case CXCursor_ClassDecl:
2673      return createCXString("ClassDecl");
2674  case CXCursor_FieldDecl:
2675      return createCXString("FieldDecl");
2676  case CXCursor_VarDecl:
2677      return createCXString("VarDecl");
2678  case CXCursor_ParmDecl:
2679      return createCXString("ParmDecl");
2680  case CXCursor_ObjCInterfaceDecl:
2681      return createCXString("ObjCInterfaceDecl");
2682  case CXCursor_ObjCCategoryDecl:
2683      return createCXString("ObjCCategoryDecl");
2684  case CXCursor_ObjCProtocolDecl:
2685      return createCXString("ObjCProtocolDecl");
2686  case CXCursor_ObjCPropertyDecl:
2687      return createCXString("ObjCPropertyDecl");
2688  case CXCursor_ObjCIvarDecl:
2689      return createCXString("ObjCIvarDecl");
2690  case CXCursor_ObjCInstanceMethodDecl:
2691      return createCXString("ObjCInstanceMethodDecl");
2692  case CXCursor_ObjCClassMethodDecl:
2693      return createCXString("ObjCClassMethodDecl");
2694  case CXCursor_ObjCImplementationDecl:
2695      return createCXString("ObjCImplementationDecl");
2696  case CXCursor_ObjCCategoryImplDecl:
2697      return createCXString("ObjCCategoryImplDecl");
2698  case CXCursor_CXXMethod:
2699      return createCXString("CXXMethod");
2700  case CXCursor_UnexposedDecl:
2701      return createCXString("UnexposedDecl");
2702  case CXCursor_ObjCSuperClassRef:
2703      return createCXString("ObjCSuperClassRef");
2704  case CXCursor_ObjCProtocolRef:
2705      return createCXString("ObjCProtocolRef");
2706  case CXCursor_ObjCClassRef:
2707      return createCXString("ObjCClassRef");
2708  case CXCursor_TypeRef:
2709      return createCXString("TypeRef");
2710  case CXCursor_TemplateRef:
2711      return createCXString("TemplateRef");
2712  case CXCursor_NamespaceRef:
2713    return createCXString("NamespaceRef");
2714  case CXCursor_MemberRef:
2715    return createCXString("MemberRef");
2716  case CXCursor_LabelRef:
2717    return createCXString("LabelRef");
2718  case CXCursor_OverloadedDeclRef:
2719    return createCXString("OverloadedDeclRef");
2720  case CXCursor_UnexposedExpr:
2721      return createCXString("UnexposedExpr");
2722  case CXCursor_BlockExpr:
2723      return createCXString("BlockExpr");
2724  case CXCursor_DeclRefExpr:
2725      return createCXString("DeclRefExpr");
2726  case CXCursor_MemberRefExpr:
2727      return createCXString("MemberRefExpr");
2728  case CXCursor_CallExpr:
2729      return createCXString("CallExpr");
2730  case CXCursor_ObjCMessageExpr:
2731      return createCXString("ObjCMessageExpr");
2732  case CXCursor_UnexposedStmt:
2733      return createCXString("UnexposedStmt");
2734  case CXCursor_LabelStmt:
2735      return createCXString("LabelStmt");
2736  case CXCursor_InvalidFile:
2737      return createCXString("InvalidFile");
2738  case CXCursor_InvalidCode:
2739    return createCXString("InvalidCode");
2740  case CXCursor_NoDeclFound:
2741      return createCXString("NoDeclFound");
2742  case CXCursor_NotImplemented:
2743      return createCXString("NotImplemented");
2744  case CXCursor_TranslationUnit:
2745      return createCXString("TranslationUnit");
2746  case CXCursor_UnexposedAttr:
2747      return createCXString("UnexposedAttr");
2748  case CXCursor_IBActionAttr:
2749      return createCXString("attribute(ibaction)");
2750  case CXCursor_IBOutletAttr:
2751     return createCXString("attribute(iboutlet)");
2752  case CXCursor_IBOutletCollectionAttr:
2753      return createCXString("attribute(iboutletcollection)");
2754  case CXCursor_PreprocessingDirective:
2755    return createCXString("preprocessing directive");
2756  case CXCursor_MacroDefinition:
2757    return createCXString("macro definition");
2758  case CXCursor_MacroInstantiation:
2759    return createCXString("macro instantiation");
2760  case CXCursor_Namespace:
2761    return createCXString("Namespace");
2762  case CXCursor_LinkageSpec:
2763    return createCXString("LinkageSpec");
2764  case CXCursor_CXXBaseSpecifier:
2765    return createCXString("C++ base class specifier");
2766  case CXCursor_Constructor:
2767    return createCXString("CXXConstructor");
2768  case CXCursor_Destructor:
2769    return createCXString("CXXDestructor");
2770  case CXCursor_ConversionFunction:
2771    return createCXString("CXXConversion");
2772  case CXCursor_TemplateTypeParameter:
2773    return createCXString("TemplateTypeParameter");
2774  case CXCursor_NonTypeTemplateParameter:
2775    return createCXString("NonTypeTemplateParameter");
2776  case CXCursor_TemplateTemplateParameter:
2777    return createCXString("TemplateTemplateParameter");
2778  case CXCursor_FunctionTemplate:
2779    return createCXString("FunctionTemplate");
2780  case CXCursor_ClassTemplate:
2781    return createCXString("ClassTemplate");
2782  case CXCursor_ClassTemplatePartialSpecialization:
2783    return createCXString("ClassTemplatePartialSpecialization");
2784  case CXCursor_NamespaceAlias:
2785    return createCXString("NamespaceAlias");
2786  case CXCursor_UsingDirective:
2787    return createCXString("UsingDirective");
2788  case CXCursor_UsingDeclaration:
2789    return createCXString("UsingDeclaration");
2790  }
2791
2792  llvm_unreachable("Unhandled CXCursorKind");
2793  return createCXString(NULL);
2794}
2795
2796enum CXChildVisitResult GetCursorVisitor(CXCursor cursor,
2797                                         CXCursor parent,
2798                                         CXClientData client_data) {
2799  CXCursor *BestCursor = static_cast<CXCursor *>(client_data);
2800  *BestCursor = cursor;
2801  return CXChildVisit_Recurse;
2802}
2803
2804CXCursor clang_getCursor(CXTranslationUnit TU, CXSourceLocation Loc) {
2805  if (!TU)
2806    return clang_getNullCursor();
2807
2808  ASTUnit *CXXUnit = static_cast<ASTUnit *>(TU);
2809  ASTUnit::ConcurrencyCheck Check(*CXXUnit);
2810
2811  // Translate the given source location to make it point at the beginning of
2812  // the token under the cursor.
2813  SourceLocation SLoc = cxloc::translateSourceLocation(Loc);
2814
2815  // Guard against an invalid SourceLocation, or we may assert in one
2816  // of the following calls.
2817  if (SLoc.isInvalid())
2818    return clang_getNullCursor();
2819
2820  SLoc = Lexer::GetBeginningOfToken(SLoc, CXXUnit->getSourceManager(),
2821                                    CXXUnit->getASTContext().getLangOptions());
2822
2823  CXCursor Result = MakeCXCursorInvalid(CXCursor_NoDeclFound);
2824  if (SLoc.isValid()) {
2825    // FIXME: Would be great to have a "hint" cursor, then walk from that
2826    // hint cursor upward until we find a cursor whose source range encloses
2827    // the region of interest, rather than starting from the translation unit.
2828    CXCursor Parent = clang_getTranslationUnitCursor(CXXUnit);
2829    CursorVisitor CursorVis(CXXUnit, GetCursorVisitor, &Result,
2830                            Decl::MaxPCHLevel, SourceLocation(SLoc));
2831    CursorVis.VisitChildren(Parent);
2832  }
2833  return Result;
2834}
2835
2836CXCursor clang_getNullCursor(void) {
2837  return MakeCXCursorInvalid(CXCursor_InvalidFile);
2838}
2839
2840unsigned clang_equalCursors(CXCursor X, CXCursor Y) {
2841  return X == Y;
2842}
2843
2844unsigned clang_isInvalid(enum CXCursorKind K) {
2845  return K >= CXCursor_FirstInvalid && K <= CXCursor_LastInvalid;
2846}
2847
2848unsigned clang_isDeclaration(enum CXCursorKind K) {
2849  return K >= CXCursor_FirstDecl && K <= CXCursor_LastDecl;
2850}
2851
2852unsigned clang_isReference(enum CXCursorKind K) {
2853  return K >= CXCursor_FirstRef && K <= CXCursor_LastRef;
2854}
2855
2856unsigned clang_isExpression(enum CXCursorKind K) {
2857  return K >= CXCursor_FirstExpr && K <= CXCursor_LastExpr;
2858}
2859
2860unsigned clang_isStatement(enum CXCursorKind K) {
2861  return K >= CXCursor_FirstStmt && K <= CXCursor_LastStmt;
2862}
2863
2864unsigned clang_isTranslationUnit(enum CXCursorKind K) {
2865  return K == CXCursor_TranslationUnit;
2866}
2867
2868unsigned clang_isPreprocessing(enum CXCursorKind K) {
2869  return K >= CXCursor_FirstPreprocessing && K <= CXCursor_LastPreprocessing;
2870}
2871
2872unsigned clang_isUnexposed(enum CXCursorKind K) {
2873  switch (K) {
2874    case CXCursor_UnexposedDecl:
2875    case CXCursor_UnexposedExpr:
2876    case CXCursor_UnexposedStmt:
2877    case CXCursor_UnexposedAttr:
2878      return true;
2879    default:
2880      return false;
2881  }
2882}
2883
2884CXCursorKind clang_getCursorKind(CXCursor C) {
2885  return C.kind;
2886}
2887
2888CXSourceLocation clang_getCursorLocation(CXCursor C) {
2889  if (clang_isReference(C.kind)) {
2890    switch (C.kind) {
2891    case CXCursor_ObjCSuperClassRef: {
2892      std::pair<ObjCInterfaceDecl *, SourceLocation> P
2893        = getCursorObjCSuperClassRef(C);
2894      return cxloc::translateSourceLocation(P.first->getASTContext(), P.second);
2895    }
2896
2897    case CXCursor_ObjCProtocolRef: {
2898      std::pair<ObjCProtocolDecl *, SourceLocation> P
2899        = getCursorObjCProtocolRef(C);
2900      return cxloc::translateSourceLocation(P.first->getASTContext(), P.second);
2901    }
2902
2903    case CXCursor_ObjCClassRef: {
2904      std::pair<ObjCInterfaceDecl *, SourceLocation> P
2905        = getCursorObjCClassRef(C);
2906      return cxloc::translateSourceLocation(P.first->getASTContext(), P.second);
2907    }
2908
2909    case CXCursor_TypeRef: {
2910      std::pair<TypeDecl *, SourceLocation> P = getCursorTypeRef(C);
2911      return cxloc::translateSourceLocation(P.first->getASTContext(), P.second);
2912    }
2913
2914    case CXCursor_TemplateRef: {
2915      std::pair<TemplateDecl *, SourceLocation> P = getCursorTemplateRef(C);
2916      return cxloc::translateSourceLocation(P.first->getASTContext(), P.second);
2917    }
2918
2919    case CXCursor_NamespaceRef: {
2920      std::pair<NamedDecl *, SourceLocation> P = getCursorNamespaceRef(C);
2921      return cxloc::translateSourceLocation(P.first->getASTContext(), P.second);
2922    }
2923
2924    case CXCursor_MemberRef: {
2925      std::pair<FieldDecl *, SourceLocation> P = getCursorMemberRef(C);
2926      return cxloc::translateSourceLocation(P.first->getASTContext(), P.second);
2927    }
2928
2929    case CXCursor_CXXBaseSpecifier: {
2930      CXXBaseSpecifier *BaseSpec = getCursorCXXBaseSpecifier(C);
2931      if (!BaseSpec)
2932        return clang_getNullLocation();
2933
2934      if (TypeSourceInfo *TSInfo = BaseSpec->getTypeSourceInfo())
2935        return cxloc::translateSourceLocation(getCursorContext(C),
2936                                            TSInfo->getTypeLoc().getBeginLoc());
2937
2938      return cxloc::translateSourceLocation(getCursorContext(C),
2939                                        BaseSpec->getSourceRange().getBegin());
2940    }
2941
2942    case CXCursor_LabelRef: {
2943      std::pair<LabelStmt *, SourceLocation> P = getCursorLabelRef(C);
2944      return cxloc::translateSourceLocation(getCursorContext(C), P.second);
2945    }
2946
2947    case CXCursor_OverloadedDeclRef:
2948      return cxloc::translateSourceLocation(getCursorContext(C),
2949                                          getCursorOverloadedDeclRef(C).second);
2950
2951    default:
2952      // FIXME: Need a way to enumerate all non-reference cases.
2953      llvm_unreachable("Missed a reference kind");
2954    }
2955  }
2956
2957  if (clang_isExpression(C.kind))
2958    return cxloc::translateSourceLocation(getCursorContext(C),
2959                                   getLocationFromExpr(getCursorExpr(C)));
2960
2961  if (clang_isStatement(C.kind))
2962    return cxloc::translateSourceLocation(getCursorContext(C),
2963                                          getCursorStmt(C)->getLocStart());
2964
2965  if (C.kind == CXCursor_PreprocessingDirective) {
2966    SourceLocation L = cxcursor::getCursorPreprocessingDirective(C).getBegin();
2967    return cxloc::translateSourceLocation(getCursorContext(C), L);
2968  }
2969
2970  if (C.kind == CXCursor_MacroInstantiation) {
2971    SourceLocation L
2972      = cxcursor::getCursorMacroInstantiation(C)->getSourceRange().getBegin();
2973    return cxloc::translateSourceLocation(getCursorContext(C), L);
2974  }
2975
2976  if (C.kind == CXCursor_MacroDefinition) {
2977    SourceLocation L = cxcursor::getCursorMacroDefinition(C)->getLocation();
2978    return cxloc::translateSourceLocation(getCursorContext(C), L);
2979  }
2980
2981  if (C.kind < CXCursor_FirstDecl || C.kind > CXCursor_LastDecl)
2982    return clang_getNullLocation();
2983
2984  Decl *D = getCursorDecl(C);
2985  SourceLocation Loc = D->getLocation();
2986  if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(D))
2987    Loc = Class->getClassLoc();
2988  return cxloc::translateSourceLocation(getCursorContext(C), Loc);
2989}
2990
2991} // end extern "C"
2992
2993static SourceRange getRawCursorExtent(CXCursor C) {
2994  if (clang_isReference(C.kind)) {
2995    switch (C.kind) {
2996    case CXCursor_ObjCSuperClassRef:
2997      return  getCursorObjCSuperClassRef(C).second;
2998
2999    case CXCursor_ObjCProtocolRef:
3000      return getCursorObjCProtocolRef(C).second;
3001
3002    case CXCursor_ObjCClassRef:
3003      return getCursorObjCClassRef(C).second;
3004
3005    case CXCursor_TypeRef:
3006      return getCursorTypeRef(C).second;
3007
3008    case CXCursor_TemplateRef:
3009      return getCursorTemplateRef(C).second;
3010
3011    case CXCursor_NamespaceRef:
3012      return getCursorNamespaceRef(C).second;
3013
3014    case CXCursor_MemberRef:
3015      return getCursorMemberRef(C).second;
3016
3017    case CXCursor_CXXBaseSpecifier:
3018      return getCursorCXXBaseSpecifier(C)->getSourceRange();
3019
3020    case CXCursor_LabelRef:
3021      return getCursorLabelRef(C).second;
3022
3023    case CXCursor_OverloadedDeclRef:
3024      return getCursorOverloadedDeclRef(C).second;
3025
3026    default:
3027      // FIXME: Need a way to enumerate all non-reference cases.
3028      llvm_unreachable("Missed a reference kind");
3029    }
3030  }
3031
3032  if (clang_isExpression(C.kind))
3033    return getCursorExpr(C)->getSourceRange();
3034
3035  if (clang_isStatement(C.kind))
3036    return getCursorStmt(C)->getSourceRange();
3037
3038  if (C.kind == CXCursor_PreprocessingDirective)
3039    return cxcursor::getCursorPreprocessingDirective(C);
3040
3041  if (C.kind == CXCursor_MacroInstantiation)
3042    return cxcursor::getCursorMacroInstantiation(C)->getSourceRange();
3043
3044  if (C.kind == CXCursor_MacroDefinition)
3045    return cxcursor::getCursorMacroDefinition(C)->getSourceRange();
3046
3047  if (C.kind >= CXCursor_FirstDecl && C.kind <= CXCursor_LastDecl)
3048    return getCursorDecl(C)->getSourceRange();
3049
3050  return SourceRange();
3051}
3052
3053extern "C" {
3054
3055CXSourceRange clang_getCursorExtent(CXCursor C) {
3056  SourceRange R = getRawCursorExtent(C);
3057  if (R.isInvalid())
3058    return clang_getNullRange();
3059
3060  return cxloc::translateSourceRange(getCursorContext(C), R);
3061}
3062
3063CXCursor clang_getCursorReferenced(CXCursor C) {
3064  if (clang_isInvalid(C.kind))
3065    return clang_getNullCursor();
3066
3067  ASTUnit *CXXUnit = getCursorASTUnit(C);
3068  if (clang_isDeclaration(C.kind)) {
3069    Decl *D = getCursorDecl(C);
3070    if (UsingDecl *Using = dyn_cast<UsingDecl>(D))
3071      return MakeCursorOverloadedDeclRef(Using, D->getLocation(), CXXUnit);
3072    if (ObjCClassDecl *Classes = dyn_cast<ObjCClassDecl>(D))
3073      return MakeCursorOverloadedDeclRef(Classes, D->getLocation(), CXXUnit);
3074    if (ObjCForwardProtocolDecl *Protocols
3075                                        = dyn_cast<ObjCForwardProtocolDecl>(D))
3076      return MakeCursorOverloadedDeclRef(Protocols, D->getLocation(), CXXUnit);
3077
3078    return C;
3079  }
3080
3081  if (clang_isExpression(C.kind)) {
3082    Expr *E = getCursorExpr(C);
3083    Decl *D = getDeclFromExpr(E);
3084    if (D)
3085      return MakeCXCursor(D, CXXUnit);
3086
3087    if (OverloadExpr *Ovl = dyn_cast_or_null<OverloadExpr>(E))
3088      return MakeCursorOverloadedDeclRef(Ovl, CXXUnit);
3089
3090    return clang_getNullCursor();
3091  }
3092
3093  if (clang_isStatement(C.kind)) {
3094    Stmt *S = getCursorStmt(C);
3095    if (GotoStmt *Goto = dyn_cast_or_null<GotoStmt>(S))
3096      return MakeCXCursor(Goto->getLabel(), getCursorDecl(C),
3097                          getCursorASTUnit(C));
3098
3099    return clang_getNullCursor();
3100  }
3101
3102  if (C.kind == CXCursor_MacroInstantiation) {
3103    if (MacroDefinition *Def = getCursorMacroInstantiation(C)->getDefinition())
3104      return MakeMacroDefinitionCursor(Def, CXXUnit);
3105  }
3106
3107  if (!clang_isReference(C.kind))
3108    return clang_getNullCursor();
3109
3110  switch (C.kind) {
3111    case CXCursor_ObjCSuperClassRef:
3112      return MakeCXCursor(getCursorObjCSuperClassRef(C).first, CXXUnit);
3113
3114    case CXCursor_ObjCProtocolRef: {
3115      return MakeCXCursor(getCursorObjCProtocolRef(C).first, CXXUnit);
3116
3117    case CXCursor_ObjCClassRef:
3118      return MakeCXCursor(getCursorObjCClassRef(C).first, CXXUnit);
3119
3120    case CXCursor_TypeRef:
3121      return MakeCXCursor(getCursorTypeRef(C).first, CXXUnit);
3122
3123    case CXCursor_TemplateRef:
3124      return MakeCXCursor(getCursorTemplateRef(C).first, CXXUnit);
3125
3126    case CXCursor_NamespaceRef:
3127      return MakeCXCursor(getCursorNamespaceRef(C).first, CXXUnit);
3128
3129    case CXCursor_MemberRef:
3130      return MakeCXCursor(getCursorMemberRef(C).first, CXXUnit);
3131
3132    case CXCursor_CXXBaseSpecifier: {
3133      CXXBaseSpecifier *B = cxcursor::getCursorCXXBaseSpecifier(C);
3134      return clang_getTypeDeclaration(cxtype::MakeCXType(B->getType(),
3135                                                         CXXUnit));
3136    }
3137
3138    case CXCursor_LabelRef:
3139      // FIXME: We end up faking the "parent" declaration here because we
3140      // don't want to make CXCursor larger.
3141      return MakeCXCursor(getCursorLabelRef(C).first,
3142                          CXXUnit->getASTContext().getTranslationUnitDecl(),
3143                          CXXUnit);
3144
3145    case CXCursor_OverloadedDeclRef:
3146      return C;
3147
3148    default:
3149      // We would prefer to enumerate all non-reference cursor kinds here.
3150      llvm_unreachable("Unhandled reference cursor kind");
3151      break;
3152    }
3153  }
3154
3155  return clang_getNullCursor();
3156}
3157
3158CXCursor clang_getCursorDefinition(CXCursor C) {
3159  if (clang_isInvalid(C.kind))
3160    return clang_getNullCursor();
3161
3162  ASTUnit *CXXUnit = getCursorASTUnit(C);
3163
3164  bool WasReference = false;
3165  if (clang_isReference(C.kind) || clang_isExpression(C.kind)) {
3166    C = clang_getCursorReferenced(C);
3167    WasReference = true;
3168  }
3169
3170  if (C.kind == CXCursor_MacroInstantiation)
3171    return clang_getCursorReferenced(C);
3172
3173  if (!clang_isDeclaration(C.kind))
3174    return clang_getNullCursor();
3175
3176  Decl *D = getCursorDecl(C);
3177  if (!D)
3178    return clang_getNullCursor();
3179
3180  switch (D->getKind()) {
3181  // Declaration kinds that don't really separate the notions of
3182  // declaration and definition.
3183  case Decl::Namespace:
3184  case Decl::Typedef:
3185  case Decl::TemplateTypeParm:
3186  case Decl::EnumConstant:
3187  case Decl::Field:
3188  case Decl::ObjCIvar:
3189  case Decl::ObjCAtDefsField:
3190  case Decl::ImplicitParam:
3191  case Decl::ParmVar:
3192  case Decl::NonTypeTemplateParm:
3193  case Decl::TemplateTemplateParm:
3194  case Decl::ObjCCategoryImpl:
3195  case Decl::ObjCImplementation:
3196  case Decl::AccessSpec:
3197  case Decl::LinkageSpec:
3198  case Decl::ObjCPropertyImpl:
3199  case Decl::FileScopeAsm:
3200  case Decl::StaticAssert:
3201  case Decl::Block:
3202    return C;
3203
3204  // Declaration kinds that don't make any sense here, but are
3205  // nonetheless harmless.
3206  case Decl::TranslationUnit:
3207    break;
3208
3209  // Declaration kinds for which the definition is not resolvable.
3210  case Decl::UnresolvedUsingTypename:
3211  case Decl::UnresolvedUsingValue:
3212    break;
3213
3214  case Decl::UsingDirective:
3215    return MakeCXCursor(cast<UsingDirectiveDecl>(D)->getNominatedNamespace(),
3216                        CXXUnit);
3217
3218  case Decl::NamespaceAlias:
3219    return MakeCXCursor(cast<NamespaceAliasDecl>(D)->getNamespace(), CXXUnit);
3220
3221  case Decl::Enum:
3222  case Decl::Record:
3223  case Decl::CXXRecord:
3224  case Decl::ClassTemplateSpecialization:
3225  case Decl::ClassTemplatePartialSpecialization:
3226    if (TagDecl *Def = cast<TagDecl>(D)->getDefinition())
3227      return MakeCXCursor(Def, CXXUnit);
3228    return clang_getNullCursor();
3229
3230  case Decl::Function:
3231  case Decl::CXXMethod:
3232  case Decl::CXXConstructor:
3233  case Decl::CXXDestructor:
3234  case Decl::CXXConversion: {
3235    const FunctionDecl *Def = 0;
3236    if (cast<FunctionDecl>(D)->getBody(Def))
3237      return MakeCXCursor(const_cast<FunctionDecl *>(Def), CXXUnit);
3238    return clang_getNullCursor();
3239  }
3240
3241  case Decl::Var: {
3242    // Ask the variable if it has a definition.
3243    if (VarDecl *Def = cast<VarDecl>(D)->getDefinition())
3244      return MakeCXCursor(Def, CXXUnit);
3245    return clang_getNullCursor();
3246  }
3247
3248  case Decl::FunctionTemplate: {
3249    const FunctionDecl *Def = 0;
3250    if (cast<FunctionTemplateDecl>(D)->getTemplatedDecl()->getBody(Def))
3251      return MakeCXCursor(Def->getDescribedFunctionTemplate(), CXXUnit);
3252    return clang_getNullCursor();
3253  }
3254
3255  case Decl::ClassTemplate: {
3256    if (RecordDecl *Def = cast<ClassTemplateDecl>(D)->getTemplatedDecl()
3257                                                            ->getDefinition())
3258      return MakeCXCursor(cast<CXXRecordDecl>(Def)->getDescribedClassTemplate(),
3259                          CXXUnit);
3260    return clang_getNullCursor();
3261  }
3262
3263  case Decl::Using:
3264    return MakeCursorOverloadedDeclRef(cast<UsingDecl>(D),
3265                                       D->getLocation(), CXXUnit);
3266
3267  case Decl::UsingShadow:
3268    return clang_getCursorDefinition(
3269                       MakeCXCursor(cast<UsingShadowDecl>(D)->getTargetDecl(),
3270                                    CXXUnit));
3271
3272  case Decl::ObjCMethod: {
3273    ObjCMethodDecl *Method = cast<ObjCMethodDecl>(D);
3274    if (Method->isThisDeclarationADefinition())
3275      return C;
3276
3277    // Dig out the method definition in the associated
3278    // @implementation, if we have it.
3279    // FIXME: The ASTs should make finding the definition easier.
3280    if (ObjCInterfaceDecl *Class
3281                       = dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext()))
3282      if (ObjCImplementationDecl *ClassImpl = Class->getImplementation())
3283        if (ObjCMethodDecl *Def = ClassImpl->getMethod(Method->getSelector(),
3284                                                  Method->isInstanceMethod()))
3285          if (Def->isThisDeclarationADefinition())
3286            return MakeCXCursor(Def, CXXUnit);
3287
3288    return clang_getNullCursor();
3289  }
3290
3291  case Decl::ObjCCategory:
3292    if (ObjCCategoryImplDecl *Impl
3293                               = cast<ObjCCategoryDecl>(D)->getImplementation())
3294      return MakeCXCursor(Impl, CXXUnit);
3295    return clang_getNullCursor();
3296
3297  case Decl::ObjCProtocol:
3298    if (!cast<ObjCProtocolDecl>(D)->isForwardDecl())
3299      return C;
3300    return clang_getNullCursor();
3301
3302  case Decl::ObjCInterface:
3303    // There are two notions of a "definition" for an Objective-C
3304    // class: the interface and its implementation. When we resolved a
3305    // reference to an Objective-C class, produce the @interface as
3306    // the definition; when we were provided with the interface,
3307    // produce the @implementation as the definition.
3308    if (WasReference) {
3309      if (!cast<ObjCInterfaceDecl>(D)->isForwardDecl())
3310        return C;
3311    } else if (ObjCImplementationDecl *Impl
3312                              = cast<ObjCInterfaceDecl>(D)->getImplementation())
3313      return MakeCXCursor(Impl, CXXUnit);
3314    return clang_getNullCursor();
3315
3316  case Decl::ObjCProperty:
3317    // FIXME: We don't really know where to find the
3318    // ObjCPropertyImplDecls that implement this property.
3319    return clang_getNullCursor();
3320
3321  case Decl::ObjCCompatibleAlias:
3322    if (ObjCInterfaceDecl *Class
3323          = cast<ObjCCompatibleAliasDecl>(D)->getClassInterface())
3324      if (!Class->isForwardDecl())
3325        return MakeCXCursor(Class, CXXUnit);
3326
3327    return clang_getNullCursor();
3328
3329  case Decl::ObjCForwardProtocol:
3330    return MakeCursorOverloadedDeclRef(cast<ObjCForwardProtocolDecl>(D),
3331                                       D->getLocation(), CXXUnit);
3332
3333  case Decl::ObjCClass:
3334    return MakeCursorOverloadedDeclRef(cast<ObjCClassDecl>(D), D->getLocation(),
3335                                       CXXUnit);
3336
3337  case Decl::Friend:
3338    if (NamedDecl *Friend = cast<FriendDecl>(D)->getFriendDecl())
3339      return clang_getCursorDefinition(MakeCXCursor(Friend, CXXUnit));
3340    return clang_getNullCursor();
3341
3342  case Decl::FriendTemplate:
3343    if (NamedDecl *Friend = cast<FriendTemplateDecl>(D)->getFriendDecl())
3344      return clang_getCursorDefinition(MakeCXCursor(Friend, CXXUnit));
3345    return clang_getNullCursor();
3346  }
3347
3348  return clang_getNullCursor();
3349}
3350
3351unsigned clang_isCursorDefinition(CXCursor C) {
3352  if (!clang_isDeclaration(C.kind))
3353    return 0;
3354
3355  return clang_getCursorDefinition(C) == C;
3356}
3357
3358unsigned clang_getNumOverloadedDecls(CXCursor C) {
3359  if (C.kind != CXCursor_OverloadedDeclRef)
3360    return 0;
3361
3362  OverloadedDeclRefStorage Storage = getCursorOverloadedDeclRef(C).first;
3363  if (OverloadExpr *E = Storage.dyn_cast<OverloadExpr *>())
3364    return E->getNumDecls();
3365
3366  if (OverloadedTemplateStorage *S
3367                              = Storage.dyn_cast<OverloadedTemplateStorage*>())
3368    return S->size();
3369
3370  Decl *D = Storage.get<Decl*>();
3371  if (UsingDecl *Using = dyn_cast<UsingDecl>(D))
3372    return Using->getNumShadowDecls();
3373  if (ObjCClassDecl *Classes = dyn_cast<ObjCClassDecl>(D))
3374    return Classes->size();
3375  if (ObjCForwardProtocolDecl *Protocols =dyn_cast<ObjCForwardProtocolDecl>(D))
3376    return Protocols->protocol_size();
3377
3378  return 0;
3379}
3380
3381CXCursor clang_getOverloadedDecl(CXCursor cursor, unsigned index) {
3382  if (cursor.kind != CXCursor_OverloadedDeclRef)
3383    return clang_getNullCursor();
3384
3385  if (index >= clang_getNumOverloadedDecls(cursor))
3386    return clang_getNullCursor();
3387
3388  ASTUnit *Unit = getCursorASTUnit(cursor);
3389  OverloadedDeclRefStorage Storage = getCursorOverloadedDeclRef(cursor).first;
3390  if (OverloadExpr *E = Storage.dyn_cast<OverloadExpr *>())
3391    return MakeCXCursor(E->decls_begin()[index], Unit);
3392
3393  if (OverloadedTemplateStorage *S
3394                              = Storage.dyn_cast<OverloadedTemplateStorage*>())
3395    return MakeCXCursor(S->begin()[index], Unit);
3396
3397  Decl *D = Storage.get<Decl*>();
3398  if (UsingDecl *Using = dyn_cast<UsingDecl>(D)) {
3399    // FIXME: This is, unfortunately, linear time.
3400    UsingDecl::shadow_iterator Pos = Using->shadow_begin();
3401    std::advance(Pos, index);
3402    return MakeCXCursor(cast<UsingShadowDecl>(*Pos)->getTargetDecl(), Unit);
3403  }
3404
3405  if (ObjCClassDecl *Classes = dyn_cast<ObjCClassDecl>(D))
3406    return MakeCXCursor(Classes->begin()[index].getInterface(), Unit);
3407
3408  if (ObjCForwardProtocolDecl *Protocols = dyn_cast<ObjCForwardProtocolDecl>(D))
3409    return MakeCXCursor(Protocols->protocol_begin()[index], Unit);
3410
3411  return clang_getNullCursor();
3412}
3413
3414void clang_getDefinitionSpellingAndExtent(CXCursor C,
3415                                          const char **startBuf,
3416                                          const char **endBuf,
3417                                          unsigned *startLine,
3418                                          unsigned *startColumn,
3419                                          unsigned *endLine,
3420                                          unsigned *endColumn) {
3421  assert(getCursorDecl(C) && "CXCursor has null decl");
3422  NamedDecl *ND = static_cast<NamedDecl *>(getCursorDecl(C));
3423  FunctionDecl *FD = dyn_cast<FunctionDecl>(ND);
3424  CompoundStmt *Body = dyn_cast<CompoundStmt>(FD->getBody());
3425
3426  SourceManager &SM = FD->getASTContext().getSourceManager();
3427  *startBuf = SM.getCharacterData(Body->getLBracLoc());
3428  *endBuf = SM.getCharacterData(Body->getRBracLoc());
3429  *startLine = SM.getSpellingLineNumber(Body->getLBracLoc());
3430  *startColumn = SM.getSpellingColumnNumber(Body->getLBracLoc());
3431  *endLine = SM.getSpellingLineNumber(Body->getRBracLoc());
3432  *endColumn = SM.getSpellingColumnNumber(Body->getRBracLoc());
3433}
3434
3435void clang_enableStackTraces(void) {
3436  llvm::sys::PrintStackTraceOnErrorSignal();
3437}
3438
3439} // end: extern "C"
3440
3441//===----------------------------------------------------------------------===//
3442// Token-based Operations.
3443//===----------------------------------------------------------------------===//
3444
3445/* CXToken layout:
3446 *   int_data[0]: a CXTokenKind
3447 *   int_data[1]: starting token location
3448 *   int_data[2]: token length
3449 *   int_data[3]: reserved
3450 *   ptr_data: for identifiers and keywords, an IdentifierInfo*.
3451 *   otherwise unused.
3452 */
3453extern "C" {
3454
3455CXTokenKind clang_getTokenKind(CXToken CXTok) {
3456  return static_cast<CXTokenKind>(CXTok.int_data[0]);
3457}
3458
3459CXString clang_getTokenSpelling(CXTranslationUnit TU, CXToken CXTok) {
3460  switch (clang_getTokenKind(CXTok)) {
3461  case CXToken_Identifier:
3462  case CXToken_Keyword:
3463    // We know we have an IdentifierInfo*, so use that.
3464    return createCXString(static_cast<IdentifierInfo *>(CXTok.ptr_data)
3465                            ->getNameStart());
3466
3467  case CXToken_Literal: {
3468    // We have stashed the starting pointer in the ptr_data field. Use it.
3469    const char *Text = static_cast<const char *>(CXTok.ptr_data);
3470    return createCXString(llvm::StringRef(Text, CXTok.int_data[2]));
3471  }
3472
3473  case CXToken_Punctuation:
3474  case CXToken_Comment:
3475    break;
3476  }
3477
3478  // We have to find the starting buffer pointer the hard way, by
3479  // deconstructing the source location.
3480  ASTUnit *CXXUnit = static_cast<ASTUnit *>(TU);
3481  if (!CXXUnit)
3482    return createCXString("");
3483
3484  SourceLocation Loc = SourceLocation::getFromRawEncoding(CXTok.int_data[1]);
3485  std::pair<FileID, unsigned> LocInfo
3486    = CXXUnit->getSourceManager().getDecomposedLoc(Loc);
3487  bool Invalid = false;
3488  llvm::StringRef Buffer
3489    = CXXUnit->getSourceManager().getBufferData(LocInfo.first, &Invalid);
3490  if (Invalid)
3491    return createCXString("");
3492
3493  return createCXString(Buffer.substr(LocInfo.second, CXTok.int_data[2]));
3494}
3495
3496CXSourceLocation clang_getTokenLocation(CXTranslationUnit TU, CXToken CXTok) {
3497  ASTUnit *CXXUnit = static_cast<ASTUnit *>(TU);
3498  if (!CXXUnit)
3499    return clang_getNullLocation();
3500
3501  return cxloc::translateSourceLocation(CXXUnit->getASTContext(),
3502                        SourceLocation::getFromRawEncoding(CXTok.int_data[1]));
3503}
3504
3505CXSourceRange clang_getTokenExtent(CXTranslationUnit TU, CXToken CXTok) {
3506  ASTUnit *CXXUnit = static_cast<ASTUnit *>(TU);
3507  if (!CXXUnit)
3508    return clang_getNullRange();
3509
3510  return cxloc::translateSourceRange(CXXUnit->getASTContext(),
3511                        SourceLocation::getFromRawEncoding(CXTok.int_data[1]));
3512}
3513
3514void clang_tokenize(CXTranslationUnit TU, CXSourceRange Range,
3515                    CXToken **Tokens, unsigned *NumTokens) {
3516  if (Tokens)
3517    *Tokens = 0;
3518  if (NumTokens)
3519    *NumTokens = 0;
3520
3521  ASTUnit *CXXUnit = static_cast<ASTUnit *>(TU);
3522  if (!CXXUnit || !Tokens || !NumTokens)
3523    return;
3524
3525  ASTUnit::ConcurrencyCheck Check(*CXXUnit);
3526
3527  SourceRange R = cxloc::translateCXSourceRange(Range);
3528  if (R.isInvalid())
3529    return;
3530
3531  SourceManager &SourceMgr = CXXUnit->getSourceManager();
3532  std::pair<FileID, unsigned> BeginLocInfo
3533    = SourceMgr.getDecomposedLoc(R.getBegin());
3534  std::pair<FileID, unsigned> EndLocInfo
3535    = SourceMgr.getDecomposedLoc(R.getEnd());
3536
3537  // Cannot tokenize across files.
3538  if (BeginLocInfo.first != EndLocInfo.first)
3539    return;
3540
3541  // Create a lexer
3542  bool Invalid = false;
3543  llvm::StringRef Buffer
3544    = SourceMgr.getBufferData(BeginLocInfo.first, &Invalid);
3545  if (Invalid)
3546    return;
3547
3548  Lexer Lex(SourceMgr.getLocForStartOfFile(BeginLocInfo.first),
3549            CXXUnit->getASTContext().getLangOptions(),
3550            Buffer.begin(), Buffer.data() + BeginLocInfo.second, Buffer.end());
3551  Lex.SetCommentRetentionState(true);
3552
3553  // Lex tokens until we hit the end of the range.
3554  const char *EffectiveBufferEnd = Buffer.data() + EndLocInfo.second;
3555  llvm::SmallVector<CXToken, 32> CXTokens;
3556  Token Tok;
3557  bool previousWasAt = false;
3558  do {
3559    // Lex the next token
3560    Lex.LexFromRawLexer(Tok);
3561    if (Tok.is(tok::eof))
3562      break;
3563
3564    // Initialize the CXToken.
3565    CXToken CXTok;
3566
3567    //   - Common fields
3568    CXTok.int_data[1] = Tok.getLocation().getRawEncoding();
3569    CXTok.int_data[2] = Tok.getLength();
3570    CXTok.int_data[3] = 0;
3571
3572    //   - Kind-specific fields
3573    if (Tok.isLiteral()) {
3574      CXTok.int_data[0] = CXToken_Literal;
3575      CXTok.ptr_data = (void *)Tok.getLiteralData();
3576    } else if (Tok.is(tok::identifier)) {
3577      // Lookup the identifier to determine whether we have a keyword.
3578      std::pair<FileID, unsigned> LocInfo
3579        = SourceMgr.getDecomposedLoc(Tok.getLocation());
3580      bool Invalid = false;
3581      llvm::StringRef Buf
3582        = CXXUnit->getSourceManager().getBufferData(LocInfo.first, &Invalid);
3583      if (Invalid)
3584        return;
3585
3586      const char *StartPos = Buf.data() + LocInfo.second;
3587      IdentifierInfo *II
3588        = CXXUnit->getPreprocessor().LookUpIdentifierInfo(Tok, StartPos);
3589
3590      if ((II->getObjCKeywordID() != tok::objc_not_keyword) && previousWasAt) {
3591        CXTok.int_data[0] = CXToken_Keyword;
3592      }
3593      else {
3594        CXTok.int_data[0] = II->getTokenID() == tok::identifier?
3595                                CXToken_Identifier
3596                              : CXToken_Keyword;
3597      }
3598      CXTok.ptr_data = II;
3599    } else if (Tok.is(tok::comment)) {
3600      CXTok.int_data[0] = CXToken_Comment;
3601      CXTok.ptr_data = 0;
3602    } else {
3603      CXTok.int_data[0] = CXToken_Punctuation;
3604      CXTok.ptr_data = 0;
3605    }
3606    CXTokens.push_back(CXTok);
3607    previousWasAt = Tok.is(tok::at);
3608  } while (Lex.getBufferLocation() <= EffectiveBufferEnd);
3609
3610  if (CXTokens.empty())
3611    return;
3612
3613  *Tokens = (CXToken *)malloc(sizeof(CXToken) * CXTokens.size());
3614  memmove(*Tokens, CXTokens.data(), sizeof(CXToken) * CXTokens.size());
3615  *NumTokens = CXTokens.size();
3616}
3617
3618void clang_disposeTokens(CXTranslationUnit TU,
3619                         CXToken *Tokens, unsigned NumTokens) {
3620  free(Tokens);
3621}
3622
3623} // end: extern "C"
3624
3625//===----------------------------------------------------------------------===//
3626// Token annotation APIs.
3627//===----------------------------------------------------------------------===//
3628
3629typedef llvm::DenseMap<unsigned, CXCursor> AnnotateTokensData;
3630static enum CXChildVisitResult AnnotateTokensVisitor(CXCursor cursor,
3631                                                     CXCursor parent,
3632                                                     CXClientData client_data);
3633namespace {
3634class AnnotateTokensWorker {
3635  AnnotateTokensData &Annotated;
3636  CXToken *Tokens;
3637  CXCursor *Cursors;
3638  unsigned NumTokens;
3639  unsigned TokIdx;
3640  CursorVisitor AnnotateVis;
3641  SourceManager &SrcMgr;
3642
3643  bool MoreTokens() const { return TokIdx < NumTokens; }
3644  unsigned NextToken() const { return TokIdx; }
3645  void AdvanceToken() { ++TokIdx; }
3646  SourceLocation GetTokenLoc(unsigned tokI) {
3647    return SourceLocation::getFromRawEncoding(Tokens[tokI].int_data[1]);
3648  }
3649
3650public:
3651  AnnotateTokensWorker(AnnotateTokensData &annotated,
3652                       CXToken *tokens, CXCursor *cursors, unsigned numTokens,
3653                       ASTUnit *CXXUnit, SourceRange RegionOfInterest)
3654    : Annotated(annotated), Tokens(tokens), Cursors(cursors),
3655      NumTokens(numTokens), TokIdx(0),
3656      AnnotateVis(CXXUnit, AnnotateTokensVisitor, this,
3657                  Decl::MaxPCHLevel, RegionOfInterest),
3658      SrcMgr(CXXUnit->getSourceManager()) {}
3659
3660  void VisitChildren(CXCursor C) { AnnotateVis.VisitChildren(C); }
3661  enum CXChildVisitResult Visit(CXCursor cursor, CXCursor parent);
3662  void AnnotateTokens(CXCursor parent);
3663};
3664}
3665
3666void AnnotateTokensWorker::AnnotateTokens(CXCursor parent) {
3667  // Walk the AST within the region of interest, annotating tokens
3668  // along the way.
3669  VisitChildren(parent);
3670
3671  for (unsigned I = 0 ; I < TokIdx ; ++I) {
3672    AnnotateTokensData::iterator Pos = Annotated.find(Tokens[I].int_data[1]);
3673    if (Pos != Annotated.end())
3674      Cursors[I] = Pos->second;
3675  }
3676
3677  // Finish up annotating any tokens left.
3678  if (!MoreTokens())
3679    return;
3680
3681  const CXCursor &C = clang_getNullCursor();
3682  for (unsigned I = TokIdx ; I < NumTokens ; ++I) {
3683    AnnotateTokensData::iterator Pos = Annotated.find(Tokens[I].int_data[1]);
3684    Cursors[I] = (Pos == Annotated.end()) ? C : Pos->second;
3685  }
3686}
3687
3688enum CXChildVisitResult
3689AnnotateTokensWorker::Visit(CXCursor cursor, CXCursor parent) {
3690  CXSourceLocation Loc = clang_getCursorLocation(cursor);
3691  // We can always annotate a preprocessing directive/macro instantiation.
3692  if (clang_isPreprocessing(cursor.kind)) {
3693    Annotated[Loc.int_data] = cursor;
3694    return CXChildVisit_Recurse;
3695  }
3696
3697  SourceRange cursorRange = getRawCursorExtent(cursor);
3698
3699  if (cursorRange.isInvalid())
3700    return CXChildVisit_Continue;
3701
3702  SourceLocation L = SourceLocation::getFromRawEncoding(Loc.int_data);
3703
3704  // Adjust the annotated range based specific declarations.
3705  const enum CXCursorKind cursorK = clang_getCursorKind(cursor);
3706  if (cursorK >= CXCursor_FirstDecl && cursorK <= CXCursor_LastDecl) {
3707    Decl *D = cxcursor::getCursorDecl(cursor);
3708    // Don't visit synthesized ObjC methods, since they have no syntatic
3709    // representation in the source.
3710    if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
3711      if (MD->isSynthesized())
3712        return CXChildVisit_Continue;
3713    }
3714    if (const DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D)) {
3715      if (TypeSourceInfo *TI = DD->getTypeSourceInfo()) {
3716        TypeLoc TL = TI->getTypeLoc();
3717        SourceLocation TLoc = TL.getSourceRange().getBegin();
3718        if (TLoc.isValid() &&
3719            SrcMgr.isBeforeInTranslationUnit(TLoc, L))
3720          cursorRange.setBegin(TLoc);
3721      }
3722    }
3723  }
3724
3725  // If the location of the cursor occurs within a macro instantiation, record
3726  // the spelling location of the cursor in our annotation map.  We can then
3727  // paper over the token labelings during a post-processing step to try and
3728  // get cursor mappings for tokens that are the *arguments* of a macro
3729  // instantiation.
3730  if (L.isMacroID()) {
3731    unsigned rawEncoding = SrcMgr.getSpellingLoc(L).getRawEncoding();
3732    // Only invalidate the old annotation if it isn't part of a preprocessing
3733    // directive.  Here we assume that the default construction of CXCursor
3734    // results in CXCursor.kind being an initialized value (i.e., 0).  If
3735    // this isn't the case, we can fix by doing lookup + insertion.
3736
3737    CXCursor &oldC = Annotated[rawEncoding];
3738    if (!clang_isPreprocessing(oldC.kind))
3739      oldC = cursor;
3740  }
3741
3742  const enum CXCursorKind K = clang_getCursorKind(parent);
3743  const CXCursor updateC =
3744    (clang_isInvalid(K) || K == CXCursor_TranslationUnit)
3745     ? clang_getNullCursor() : parent;
3746
3747  while (MoreTokens()) {
3748    const unsigned I = NextToken();
3749    SourceLocation TokLoc = GetTokenLoc(I);
3750    switch (LocationCompare(SrcMgr, TokLoc, cursorRange)) {
3751      case RangeBefore:
3752        Cursors[I] = updateC;
3753        AdvanceToken();
3754        continue;
3755      case RangeAfter:
3756      case RangeOverlap:
3757        break;
3758    }
3759    break;
3760  }
3761
3762  // Visit children to get their cursor information.
3763  const unsigned BeforeChildren = NextToken();
3764  VisitChildren(cursor);
3765  const unsigned AfterChildren = NextToken();
3766
3767  // Adjust 'Last' to the last token within the extent of the cursor.
3768  while (MoreTokens()) {
3769    const unsigned I = NextToken();
3770    SourceLocation TokLoc = GetTokenLoc(I);
3771    switch (LocationCompare(SrcMgr, TokLoc, cursorRange)) {
3772      case RangeBefore:
3773        assert(0 && "Infeasible");
3774      case RangeAfter:
3775        break;
3776      case RangeOverlap:
3777        Cursors[I] = updateC;
3778        AdvanceToken();
3779        continue;
3780    }
3781    break;
3782  }
3783  const unsigned Last = NextToken();
3784
3785  // Scan the tokens that are at the beginning of the cursor, but are not
3786  // capture by the child cursors.
3787
3788  // For AST elements within macros, rely on a post-annotate pass to
3789  // to correctly annotate the tokens with cursors.  Otherwise we can
3790  // get confusing results of having tokens that map to cursors that really
3791  // are expanded by an instantiation.
3792  if (L.isMacroID())
3793    cursor = clang_getNullCursor();
3794
3795  for (unsigned I = BeforeChildren; I != AfterChildren; ++I) {
3796    if (!clang_isInvalid(clang_getCursorKind(Cursors[I])))
3797      break;
3798    Cursors[I] = cursor;
3799  }
3800  // Scan the tokens that are at the end of the cursor, but are not captured
3801  // but the child cursors.
3802  for (unsigned I = AfterChildren; I != Last; ++I)
3803    Cursors[I] = cursor;
3804
3805  TokIdx = Last;
3806  return CXChildVisit_Continue;
3807}
3808
3809static enum CXChildVisitResult AnnotateTokensVisitor(CXCursor cursor,
3810                                                     CXCursor parent,
3811                                                     CXClientData client_data) {
3812  return static_cast<AnnotateTokensWorker*>(client_data)->Visit(cursor, parent);
3813}
3814
3815extern "C" {
3816
3817void clang_annotateTokens(CXTranslationUnit TU,
3818                          CXToken *Tokens, unsigned NumTokens,
3819                          CXCursor *Cursors) {
3820
3821  if (NumTokens == 0 || !Tokens || !Cursors)
3822    return;
3823
3824  ASTUnit *CXXUnit = static_cast<ASTUnit *>(TU);
3825  if (!CXXUnit) {
3826    // Any token we don't specifically annotate will have a NULL cursor.
3827    const CXCursor &C = clang_getNullCursor();
3828    for (unsigned I = 0; I != NumTokens; ++I)
3829      Cursors[I] = C;
3830    return;
3831  }
3832
3833  ASTUnit::ConcurrencyCheck Check(*CXXUnit);
3834
3835  // Determine the region of interest, which contains all of the tokens.
3836  SourceRange RegionOfInterest;
3837  RegionOfInterest.setBegin(cxloc::translateSourceLocation(
3838                                        clang_getTokenLocation(TU, Tokens[0])));
3839  RegionOfInterest.setEnd(cxloc::translateSourceLocation(
3840                                clang_getTokenLocation(TU,
3841                                                       Tokens[NumTokens - 1])));
3842
3843  // A mapping from the source locations found when re-lexing or traversing the
3844  // region of interest to the corresponding cursors.
3845  AnnotateTokensData Annotated;
3846
3847  // Relex the tokens within the source range to look for preprocessing
3848  // directives.
3849  SourceManager &SourceMgr = CXXUnit->getSourceManager();
3850  std::pair<FileID, unsigned> BeginLocInfo
3851    = SourceMgr.getDecomposedLoc(RegionOfInterest.getBegin());
3852  std::pair<FileID, unsigned> EndLocInfo
3853    = SourceMgr.getDecomposedLoc(RegionOfInterest.getEnd());
3854
3855  llvm::StringRef Buffer;
3856  bool Invalid = false;
3857  if (BeginLocInfo.first == EndLocInfo.first &&
3858      ((Buffer = SourceMgr.getBufferData(BeginLocInfo.first, &Invalid)),true) &&
3859      !Invalid) {
3860    Lexer Lex(SourceMgr.getLocForStartOfFile(BeginLocInfo.first),
3861              CXXUnit->getASTContext().getLangOptions(),
3862              Buffer.begin(), Buffer.data() + BeginLocInfo.second,
3863              Buffer.end());
3864    Lex.SetCommentRetentionState(true);
3865
3866    // Lex tokens in raw mode until we hit the end of the range, to avoid
3867    // entering #includes or expanding macros.
3868    while (true) {
3869      Token Tok;
3870      Lex.LexFromRawLexer(Tok);
3871
3872    reprocess:
3873      if (Tok.is(tok::hash) && Tok.isAtStartOfLine()) {
3874        // We have found a preprocessing directive. Gobble it up so that we
3875        // don't see it while preprocessing these tokens later, but keep track of
3876        // all of the token locations inside this preprocessing directive so that
3877        // we can annotate them appropriately.
3878        //
3879        // FIXME: Some simple tests here could identify macro definitions and
3880        // #undefs, to provide specific cursor kinds for those.
3881        std::vector<SourceLocation> Locations;
3882        do {
3883          Locations.push_back(Tok.getLocation());
3884          Lex.LexFromRawLexer(Tok);
3885        } while (!Tok.isAtStartOfLine() && !Tok.is(tok::eof));
3886
3887        using namespace cxcursor;
3888        CXCursor Cursor
3889          = MakePreprocessingDirectiveCursor(SourceRange(Locations.front(),
3890                                                         Locations.back()),
3891                                           CXXUnit);
3892        for (unsigned I = 0, N = Locations.size(); I != N; ++I) {
3893          Annotated[Locations[I].getRawEncoding()] = Cursor;
3894        }
3895
3896        if (Tok.isAtStartOfLine())
3897          goto reprocess;
3898
3899        continue;
3900      }
3901
3902      if (Tok.is(tok::eof))
3903        break;
3904    }
3905  }
3906
3907  // Annotate all of the source locations in the region of interest that map to
3908  // a specific cursor.
3909  AnnotateTokensWorker W(Annotated, Tokens, Cursors, NumTokens,
3910                         CXXUnit, RegionOfInterest);
3911  W.AnnotateTokens(clang_getTranslationUnitCursor(CXXUnit));
3912}
3913} // end: extern "C"
3914
3915//===----------------------------------------------------------------------===//
3916// Operations for querying linkage of a cursor.
3917//===----------------------------------------------------------------------===//
3918
3919extern "C" {
3920CXLinkageKind clang_getCursorLinkage(CXCursor cursor) {
3921  if (!clang_isDeclaration(cursor.kind))
3922    return CXLinkage_Invalid;
3923
3924  Decl *D = cxcursor::getCursorDecl(cursor);
3925  if (NamedDecl *ND = dyn_cast_or_null<NamedDecl>(D))
3926    switch (ND->getLinkage()) {
3927      case NoLinkage: return CXLinkage_NoLinkage;
3928      case InternalLinkage: return CXLinkage_Internal;
3929      case UniqueExternalLinkage: return CXLinkage_UniqueExternal;
3930      case ExternalLinkage: return CXLinkage_External;
3931    };
3932
3933  return CXLinkage_Invalid;
3934}
3935} // end: extern "C"
3936
3937//===----------------------------------------------------------------------===//
3938// Operations for querying language of a cursor.
3939//===----------------------------------------------------------------------===//
3940
3941static CXLanguageKind getDeclLanguage(const Decl *D) {
3942  switch (D->getKind()) {
3943    default:
3944      break;
3945    case Decl::ImplicitParam:
3946    case Decl::ObjCAtDefsField:
3947    case Decl::ObjCCategory:
3948    case Decl::ObjCCategoryImpl:
3949    case Decl::ObjCClass:
3950    case Decl::ObjCCompatibleAlias:
3951    case Decl::ObjCForwardProtocol:
3952    case Decl::ObjCImplementation:
3953    case Decl::ObjCInterface:
3954    case Decl::ObjCIvar:
3955    case Decl::ObjCMethod:
3956    case Decl::ObjCProperty:
3957    case Decl::ObjCPropertyImpl:
3958    case Decl::ObjCProtocol:
3959      return CXLanguage_ObjC;
3960    case Decl::CXXConstructor:
3961    case Decl::CXXConversion:
3962    case Decl::CXXDestructor:
3963    case Decl::CXXMethod:
3964    case Decl::CXXRecord:
3965    case Decl::ClassTemplate:
3966    case Decl::ClassTemplatePartialSpecialization:
3967    case Decl::ClassTemplateSpecialization:
3968    case Decl::Friend:
3969    case Decl::FriendTemplate:
3970    case Decl::FunctionTemplate:
3971    case Decl::LinkageSpec:
3972    case Decl::Namespace:
3973    case Decl::NamespaceAlias:
3974    case Decl::NonTypeTemplateParm:
3975    case Decl::StaticAssert:
3976    case Decl::TemplateTemplateParm:
3977    case Decl::TemplateTypeParm:
3978    case Decl::UnresolvedUsingTypename:
3979    case Decl::UnresolvedUsingValue:
3980    case Decl::Using:
3981    case Decl::UsingDirective:
3982    case Decl::UsingShadow:
3983      return CXLanguage_CPlusPlus;
3984  }
3985
3986  return CXLanguage_C;
3987}
3988
3989extern "C" {
3990
3991enum CXAvailabilityKind clang_getCursorAvailability(CXCursor cursor) {
3992  if (clang_isDeclaration(cursor.kind))
3993    if (Decl *D = cxcursor::getCursorDecl(cursor)) {
3994      if (D->hasAttr<UnavailableAttr>() ||
3995          (isa<FunctionDecl>(D) && cast<FunctionDecl>(D)->isDeleted()))
3996        return CXAvailability_Available;
3997
3998      if (D->hasAttr<DeprecatedAttr>())
3999        return CXAvailability_Deprecated;
4000    }
4001
4002  return CXAvailability_Available;
4003}
4004
4005CXLanguageKind clang_getCursorLanguage(CXCursor cursor) {
4006  if (clang_isDeclaration(cursor.kind))
4007    return getDeclLanguage(cxcursor::getCursorDecl(cursor));
4008
4009  return CXLanguage_Invalid;
4010}
4011
4012CXCursor clang_getCursorSemanticParent(CXCursor cursor) {
4013  if (clang_isDeclaration(cursor.kind)) {
4014    if (Decl *D = getCursorDecl(cursor)) {
4015      DeclContext *DC = D->getDeclContext();
4016      return MakeCXCursor(cast<Decl>(DC), getCursorASTUnit(cursor));
4017    }
4018  }
4019
4020  if (clang_isStatement(cursor.kind) || clang_isExpression(cursor.kind)) {
4021    if (Decl *D = getCursorDecl(cursor))
4022      return MakeCXCursor(D, getCursorASTUnit(cursor));
4023  }
4024
4025  return clang_getNullCursor();
4026}
4027
4028CXCursor clang_getCursorLexicalParent(CXCursor cursor) {
4029  if (clang_isDeclaration(cursor.kind)) {
4030    if (Decl *D = getCursorDecl(cursor)) {
4031      DeclContext *DC = D->getLexicalDeclContext();
4032      return MakeCXCursor(cast<Decl>(DC), getCursorASTUnit(cursor));
4033    }
4034  }
4035
4036  // FIXME: Note that we can't easily compute the lexical context of a
4037  // statement or expression, so we return nothing.
4038  return clang_getNullCursor();
4039}
4040
4041static void CollectOverriddenMethods(DeclContext *Ctx,
4042                                     ObjCMethodDecl *Method,
4043                            llvm::SmallVectorImpl<ObjCMethodDecl *> &Methods) {
4044  if (!Ctx)
4045    return;
4046
4047  // If we have a class or category implementation, jump straight to the
4048  // interface.
4049  if (ObjCImplDecl *Impl = dyn_cast<ObjCImplDecl>(Ctx))
4050    return CollectOverriddenMethods(Impl->getClassInterface(), Method, Methods);
4051
4052  ObjCContainerDecl *Container = dyn_cast<ObjCContainerDecl>(Ctx);
4053  if (!Container)
4054    return;
4055
4056  // Check whether we have a matching method at this level.
4057  if (ObjCMethodDecl *Overridden = Container->getMethod(Method->getSelector(),
4058                                                    Method->isInstanceMethod()))
4059    if (Method != Overridden) {
4060      // We found an override at this level; there is no need to look
4061      // into other protocols or categories.
4062      Methods.push_back(Overridden);
4063      return;
4064    }
4065
4066  if (ObjCProtocolDecl *Protocol = dyn_cast<ObjCProtocolDecl>(Container)) {
4067    for (ObjCProtocolDecl::protocol_iterator P = Protocol->protocol_begin(),
4068                                          PEnd = Protocol->protocol_end();
4069         P != PEnd; ++P)
4070      CollectOverriddenMethods(*P, Method, Methods);
4071  }
4072
4073  if (ObjCCategoryDecl *Category = dyn_cast<ObjCCategoryDecl>(Container)) {
4074    for (ObjCCategoryDecl::protocol_iterator P = Category->protocol_begin(),
4075                                          PEnd = Category->protocol_end();
4076         P != PEnd; ++P)
4077      CollectOverriddenMethods(*P, Method, Methods);
4078  }
4079
4080  if (ObjCInterfaceDecl *Interface = dyn_cast<ObjCInterfaceDecl>(Container)) {
4081    for (ObjCInterfaceDecl::protocol_iterator P = Interface->protocol_begin(),
4082                                           PEnd = Interface->protocol_end();
4083         P != PEnd; ++P)
4084      CollectOverriddenMethods(*P, Method, Methods);
4085
4086    for (ObjCCategoryDecl *Category = Interface->getCategoryList();
4087         Category; Category = Category->getNextClassCategory())
4088      CollectOverriddenMethods(Category, Method, Methods);
4089
4090    // We only look into the superclass if we haven't found anything yet.
4091    if (Methods.empty())
4092      if (ObjCInterfaceDecl *Super = Interface->getSuperClass())
4093        return CollectOverriddenMethods(Super, Method, Methods);
4094  }
4095}
4096
4097void clang_getOverriddenCursors(CXCursor cursor,
4098                                CXCursor **overridden,
4099                                unsigned *num_overridden) {
4100  if (overridden)
4101    *overridden = 0;
4102  if (num_overridden)
4103    *num_overridden = 0;
4104  if (!overridden || !num_overridden)
4105    return;
4106
4107  if (!clang_isDeclaration(cursor.kind))
4108    return;
4109
4110  Decl *D = getCursorDecl(cursor);
4111  if (!D)
4112    return;
4113
4114  // Handle C++ member functions.
4115  ASTUnit *CXXUnit = getCursorASTUnit(cursor);
4116  if (CXXMethodDecl *CXXMethod = dyn_cast<CXXMethodDecl>(D)) {
4117    *num_overridden = CXXMethod->size_overridden_methods();
4118    if (!*num_overridden)
4119      return;
4120
4121    *overridden = new CXCursor [*num_overridden];
4122    unsigned I = 0;
4123    for (CXXMethodDecl::method_iterator
4124              M = CXXMethod->begin_overridden_methods(),
4125           MEnd = CXXMethod->end_overridden_methods();
4126         M != MEnd; (void)++M, ++I)
4127      (*overridden)[I] = MakeCXCursor(const_cast<CXXMethodDecl*>(*M), CXXUnit);
4128    return;
4129  }
4130
4131  ObjCMethodDecl *Method = dyn_cast<ObjCMethodDecl>(D);
4132  if (!Method)
4133    return;
4134
4135  // Handle Objective-C methods.
4136  llvm::SmallVector<ObjCMethodDecl *, 4> Methods;
4137  CollectOverriddenMethods(Method->getDeclContext(), Method, Methods);
4138
4139  if (Methods.empty())
4140    return;
4141
4142  *num_overridden = Methods.size();
4143  *overridden = new CXCursor [Methods.size()];
4144  for (unsigned I = 0, N = Methods.size(); I != N; ++I)
4145    (*overridden)[I] = MakeCXCursor(Methods[I], CXXUnit);
4146}
4147
4148void clang_disposeOverriddenCursors(CXCursor *overridden) {
4149  delete [] overridden;
4150}
4151
4152} // end: extern "C"
4153
4154
4155//===----------------------------------------------------------------------===//
4156// C++ AST instrospection.
4157//===----------------------------------------------------------------------===//
4158
4159extern "C" {
4160unsigned clang_CXXMethod_isStatic(CXCursor C) {
4161  if (!clang_isDeclaration(C.kind))
4162    return 0;
4163
4164  CXXMethodDecl *Method = 0;
4165  Decl *D = cxcursor::getCursorDecl(C);
4166  if (FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(D))
4167    Method = dyn_cast<CXXMethodDecl>(FunTmpl->getTemplatedDecl());
4168  else
4169    Method = dyn_cast_or_null<CXXMethodDecl>(D);
4170  return (Method && Method->isStatic()) ? 1 : 0;
4171}
4172
4173} // end: extern "C"
4174
4175//===----------------------------------------------------------------------===//
4176// Attribute introspection.
4177//===----------------------------------------------------------------------===//
4178
4179extern "C" {
4180CXType clang_getIBOutletCollectionType(CXCursor C) {
4181  if (C.kind != CXCursor_IBOutletCollectionAttr)
4182    return cxtype::MakeCXType(QualType(), cxcursor::getCursorASTUnit(C));
4183
4184  IBOutletCollectionAttr *A =
4185    cast<IBOutletCollectionAttr>(cxcursor::getCursorAttr(C));
4186
4187  return cxtype::MakeCXType(A->getInterface(), cxcursor::getCursorASTUnit(C));
4188}
4189} // end: extern "C"
4190
4191//===----------------------------------------------------------------------===//
4192// CXString Operations.
4193//===----------------------------------------------------------------------===//
4194
4195extern "C" {
4196const char *clang_getCString(CXString string) {
4197  return string.Spelling;
4198}
4199
4200void clang_disposeString(CXString string) {
4201  if (string.MustFreeString && string.Spelling)
4202    free((void*)string.Spelling);
4203}
4204
4205} // end: extern "C"
4206
4207namespace clang { namespace cxstring {
4208CXString createCXString(const char *String, bool DupString){
4209  CXString Str;
4210  if (DupString) {
4211    Str.Spelling = strdup(String);
4212    Str.MustFreeString = 1;
4213  } else {
4214    Str.Spelling = String;
4215    Str.MustFreeString = 0;
4216  }
4217  return Str;
4218}
4219
4220CXString createCXString(llvm::StringRef String, bool DupString) {
4221  CXString Result;
4222  if (DupString || (!String.empty() && String.data()[String.size()] != 0)) {
4223    char *Spelling = (char *)malloc(String.size() + 1);
4224    memmove(Spelling, String.data(), String.size());
4225    Spelling[String.size()] = 0;
4226    Result.Spelling = Spelling;
4227    Result.MustFreeString = 1;
4228  } else {
4229    Result.Spelling = String.data();
4230    Result.MustFreeString = 0;
4231  }
4232  return Result;
4233}
4234}}
4235
4236//===----------------------------------------------------------------------===//
4237// Misc. utility functions.
4238//===----------------------------------------------------------------------===//
4239
4240extern "C" {
4241
4242CXString clang_getClangVersion() {
4243  return createCXString(getClangFullVersion());
4244}
4245
4246} // end: extern "C"
4247