CXCursor.cpp revision f111d935722ed488144600cea5ed03a6b5069e8f 
1//===- CXCursor.cpp - Routines for manipulating CXCursors -----------------===//
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 defines routines for manipulating CXCursors. It should be the
11// only file that has internal knowledge of the encoding of the data in
12// CXCursor.
13//
14//===----------------------------------------------------------------------===//
15
16#include "CXTranslationUnit.h"
17#include "CXCursor.h"
18#include "CXString.h"
19#include "clang/Frontend/ASTUnit.h"
20#include "clang/AST/Decl.h"
21#include "clang/AST/DeclCXX.h"
22#include "clang/AST/DeclObjC.h"
23#include "clang/AST/Expr.h"
24#include "clang/AST/ExprCXX.h"
25#include "clang-c/Index.h"
26#include "llvm/Support/ErrorHandling.h"
27
28using namespace clang;
29using namespace cxcursor;
30
31CXCursor cxcursor::MakeCXCursorInvalid(CXCursorKind K) {
32  assert(K >= CXCursor_FirstInvalid && K <= CXCursor_LastInvalid);
33  CXCursor C = { K, { 0, 0, 0 } };
34  return C;
35}
36
37static CXCursorKind GetCursorKind(const Attr *A) {
38  assert(A && "Invalid arguments!");
39  switch (A->getKind()) {
40    default: break;
41    case attr::IBAction: return CXCursor_IBActionAttr;
42    case attr::IBOutlet: return CXCursor_IBOutletAttr;
43    case attr::IBOutletCollection: return CXCursor_IBOutletCollectionAttr;
44  }
45
46  return CXCursor_UnexposedAttr;
47}
48
49CXCursor cxcursor::MakeCXCursor(const Attr *A, Decl *Parent,
50                                CXTranslationUnit TU) {
51  assert(A && Parent && TU && "Invalid arguments!");
52  CXCursor C = { GetCursorKind(A), { Parent, (void*)A, TU } };
53  return C;
54}
55
56CXCursor cxcursor::MakeCXCursor(Decl *D, CXTranslationUnit TU,
57                                bool FirstInDeclGroup) {
58  assert(D && TU && "Invalid arguments!");
59  CXCursor C = { getCursorKindForDecl(D),
60                 { D, (void*)(intptr_t) (FirstInDeclGroup ? 1 : 0), TU }
61               };
62  return C;
63}
64
65CXCursor cxcursor::MakeCXCursor(Stmt *S, Decl *Parent,
66                                CXTranslationUnit TU) {
67  assert(S && TU && "Invalid arguments!");
68  CXCursorKind K = CXCursor_NotImplemented;
69
70  switch (S->getStmtClass()) {
71  case Stmt::NoStmtClass:
72    break;
73
74  case Stmt::NullStmtClass:
75  case Stmt::CompoundStmtClass:
76  case Stmt::CaseStmtClass:
77  case Stmt::DefaultStmtClass:
78  case Stmt::IfStmtClass:
79  case Stmt::SwitchStmtClass:
80  case Stmt::WhileStmtClass:
81  case Stmt::DoStmtClass:
82  case Stmt::ForStmtClass:
83  case Stmt::GotoStmtClass:
84  case Stmt::IndirectGotoStmtClass:
85  case Stmt::ContinueStmtClass:
86  case Stmt::BreakStmtClass:
87  case Stmt::ReturnStmtClass:
88  case Stmt::DeclStmtClass:
89  case Stmt::AsmStmtClass:
90  case Stmt::ObjCAtTryStmtClass:
91  case Stmt::ObjCAtCatchStmtClass:
92  case Stmt::ObjCAtFinallyStmtClass:
93  case Stmt::ObjCAtThrowStmtClass:
94  case Stmt::ObjCAtSynchronizedStmtClass:
95  case Stmt::ObjCForCollectionStmtClass:
96  case Stmt::CXXCatchStmtClass:
97  case Stmt::CXXTryStmtClass:
98  case Stmt::CXXForRangeStmtClass:
99    K = CXCursor_UnexposedStmt;
100    break;
101
102  case Stmt::LabelStmtClass:
103    K = CXCursor_LabelStmt;
104    break;
105
106  case Stmt::PredefinedExprClass:
107  case Stmt::IntegerLiteralClass:
108  case Stmt::FloatingLiteralClass:
109  case Stmt::ImaginaryLiteralClass:
110  case Stmt::StringLiteralClass:
111  case Stmt::CharacterLiteralClass:
112  case Stmt::ParenExprClass:
113  case Stmt::UnaryOperatorClass:
114  case Stmt::OffsetOfExprClass:
115  case Stmt::UnaryExprOrTypeTraitExprClass:
116  case Stmt::ArraySubscriptExprClass:
117  case Stmt::BinaryOperatorClass:
118  case Stmt::CompoundAssignOperatorClass:
119  case Stmt::ConditionalOperatorClass:
120  case Stmt::BinaryConditionalOperatorClass:
121  case Stmt::ImplicitCastExprClass:
122  case Stmt::CStyleCastExprClass:
123  case Stmt::CompoundLiteralExprClass:
124  case Stmt::ExtVectorElementExprClass:
125  case Stmt::InitListExprClass:
126  case Stmt::DesignatedInitExprClass:
127  case Stmt::ImplicitValueInitExprClass:
128  case Stmt::ParenListExprClass:
129  case Stmt::VAArgExprClass:
130  case Stmt::AddrLabelExprClass:
131  case Stmt::StmtExprClass:
132  case Stmt::ChooseExprClass:
133  case Stmt::GenericSelectionExprClass:
134  case Stmt::GNUNullExprClass:
135  case Stmt::CXXStaticCastExprClass:
136  case Stmt::CXXDynamicCastExprClass:
137  case Stmt::CXXReinterpretCastExprClass:
138  case Stmt::CXXConstCastExprClass:
139  case Stmt::CXXFunctionalCastExprClass:
140  case Stmt::CXXTypeidExprClass:
141  case Stmt::CXXUuidofExprClass:
142  case Stmt::CXXBoolLiteralExprClass:
143  case Stmt::CXXNullPtrLiteralExprClass:
144  case Stmt::CXXThisExprClass:
145  case Stmt::CXXThrowExprClass:
146  case Stmt::CXXDefaultArgExprClass:
147  case Stmt::CXXScalarValueInitExprClass:
148  case Stmt::CXXNewExprClass:
149  case Stmt::CXXDeleteExprClass:
150  case Stmt::CXXPseudoDestructorExprClass:
151  case Stmt::UnresolvedLookupExprClass:
152  case Stmt::UnaryTypeTraitExprClass:
153  case Stmt::BinaryTypeTraitExprClass:
154  case Stmt::DependentScopeDeclRefExprClass:
155  case Stmt::CXXBindTemporaryExprClass:
156  case Stmt::ExprWithCleanupsClass:
157  case Stmt::CXXUnresolvedConstructExprClass:
158  case Stmt::CXXDependentScopeMemberExprClass:
159  case Stmt::UnresolvedMemberExprClass:
160  case Stmt::CXXNoexceptExprClass:
161  case Stmt::ObjCStringLiteralClass:
162  case Stmt::ObjCEncodeExprClass:
163  case Stmt::ObjCSelectorExprClass:
164  case Stmt::ObjCProtocolExprClass:
165  case Stmt::ObjCIsaExprClass:
166  case Stmt::ShuffleVectorExprClass:
167  case Stmt::BlockExprClass:
168  case Stmt::OpaqueValueExprClass:
169  case Stmt::PackExpansionExprClass:
170  case Stmt::SizeOfPackExprClass:
171    K = CXCursor_UnexposedExpr;
172    break;
173
174  case Stmt::DeclRefExprClass:
175  case Stmt::BlockDeclRefExprClass:
176  case Stmt::SubstNonTypeTemplateParmPackExprClass:
177    // FIXME: UnresolvedLookupExpr?
178    // FIXME: DependentScopeDeclRefExpr?
179    K = CXCursor_DeclRefExpr;
180    break;
181
182  case Stmt::MemberExprClass:
183  case Stmt::ObjCIvarRefExprClass:
184  case Stmt::ObjCPropertyRefExprClass:
185    // FIXME: UnresolvedMemberExpr?
186    // FIXME: CXXDependentScopeMemberExpr?
187    K = CXCursor_MemberRefExpr;
188    break;
189
190  case Stmt::CallExprClass:
191  case Stmt::CXXOperatorCallExprClass:
192  case Stmt::CXXMemberCallExprClass:
193  case Stmt::CUDAKernelCallExprClass:
194  case Stmt::CXXConstructExprClass:
195  case Stmt::CXXTemporaryObjectExprClass:
196    // FIXME: CXXUnresolvedConstructExpr
197    K = CXCursor_CallExpr;
198    break;
199
200  case Stmt::ObjCMessageExprClass:
201    K = CXCursor_ObjCMessageExpr;
202    break;
203  }
204
205  CXCursor C = { K, { Parent, S, TU } };
206  return C;
207}
208
209CXCursor cxcursor::MakeCursorObjCSuperClassRef(ObjCInterfaceDecl *Super,
210                                               SourceLocation Loc,
211                                               CXTranslationUnit TU) {
212  assert(Super && TU && "Invalid arguments!");
213  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
214  CXCursor C = { CXCursor_ObjCSuperClassRef, { Super, RawLoc, TU } };
215  return C;
216}
217
218std::pair<ObjCInterfaceDecl *, SourceLocation>
219cxcursor::getCursorObjCSuperClassRef(CXCursor C) {
220  assert(C.kind == CXCursor_ObjCSuperClassRef);
221  return std::make_pair(static_cast<ObjCInterfaceDecl *>(C.data[0]),
222           SourceLocation::getFromRawEncoding(
223                                      reinterpret_cast<uintptr_t>(C.data[1])));
224}
225
226CXCursor cxcursor::MakeCursorObjCProtocolRef(ObjCProtocolDecl *Super,
227                                             SourceLocation Loc,
228                                             CXTranslationUnit TU) {
229  assert(Super && TU && "Invalid arguments!");
230  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
231  CXCursor C = { CXCursor_ObjCProtocolRef, { Super, RawLoc, TU } };
232  return C;
233}
234
235std::pair<ObjCProtocolDecl *, SourceLocation>
236cxcursor::getCursorObjCProtocolRef(CXCursor C) {
237  assert(C.kind == CXCursor_ObjCProtocolRef);
238  return std::make_pair(static_cast<ObjCProtocolDecl *>(C.data[0]),
239           SourceLocation::getFromRawEncoding(
240                                      reinterpret_cast<uintptr_t>(C.data[1])));
241}
242
243CXCursor cxcursor::MakeCursorObjCClassRef(ObjCInterfaceDecl *Class,
244                                          SourceLocation Loc,
245                                          CXTranslationUnit TU) {
246  // 'Class' can be null for invalid code.
247  if (!Class)
248    return MakeCXCursorInvalid(CXCursor_InvalidCode);
249  assert(TU && "Invalid arguments!");
250  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
251  CXCursor C = { CXCursor_ObjCClassRef, { Class, RawLoc, TU } };
252  return C;
253}
254
255std::pair<ObjCInterfaceDecl *, SourceLocation>
256cxcursor::getCursorObjCClassRef(CXCursor C) {
257  assert(C.kind == CXCursor_ObjCClassRef);
258  return std::make_pair(static_cast<ObjCInterfaceDecl *>(C.data[0]),
259           SourceLocation::getFromRawEncoding(
260                                      reinterpret_cast<uintptr_t>(C.data[1])));
261}
262
263CXCursor cxcursor::MakeCursorTypeRef(TypeDecl *Type, SourceLocation Loc,
264                                     CXTranslationUnit TU) {
265  assert(Type && TU && "Invalid arguments!");
266  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
267  CXCursor C = { CXCursor_TypeRef, { Type, RawLoc, TU } };
268  return C;
269}
270
271std::pair<TypeDecl *, SourceLocation>
272cxcursor::getCursorTypeRef(CXCursor C) {
273  assert(C.kind == CXCursor_TypeRef);
274  return std::make_pair(static_cast<TypeDecl *>(C.data[0]),
275           SourceLocation::getFromRawEncoding(
276                                      reinterpret_cast<uintptr_t>(C.data[1])));
277}
278
279CXCursor cxcursor::MakeCursorTemplateRef(TemplateDecl *Template,
280                                         SourceLocation Loc,
281                                         CXTranslationUnit TU) {
282  assert(Template && TU && "Invalid arguments!");
283  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
284  CXCursor C = { CXCursor_TemplateRef, { Template, RawLoc, TU } };
285  return C;
286}
287
288std::pair<TemplateDecl *, SourceLocation>
289cxcursor::getCursorTemplateRef(CXCursor C) {
290  assert(C.kind == CXCursor_TemplateRef);
291  return std::make_pair(static_cast<TemplateDecl *>(C.data[0]),
292                        SourceLocation::getFromRawEncoding(
293                                       reinterpret_cast<uintptr_t>(C.data[1])));
294}
295
296CXCursor cxcursor::MakeCursorNamespaceRef(NamedDecl *NS, SourceLocation Loc,
297                                          CXTranslationUnit TU) {
298
299  assert(NS && (isa<NamespaceDecl>(NS) || isa<NamespaceAliasDecl>(NS)) && TU &&
300         "Invalid arguments!");
301  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
302  CXCursor C = { CXCursor_NamespaceRef, { NS, RawLoc, TU } };
303  return C;
304}
305
306std::pair<NamedDecl *, SourceLocation>
307cxcursor::getCursorNamespaceRef(CXCursor C) {
308  assert(C.kind == CXCursor_NamespaceRef);
309  return std::make_pair(static_cast<NamedDecl *>(C.data[0]),
310                        SourceLocation::getFromRawEncoding(
311                                       reinterpret_cast<uintptr_t>(C.data[1])));
312}
313
314CXCursor cxcursor::MakeCursorMemberRef(FieldDecl *Field, SourceLocation Loc,
315                                       CXTranslationUnit TU) {
316
317  assert(Field && TU && "Invalid arguments!");
318  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
319  CXCursor C = { CXCursor_MemberRef, { Field, RawLoc, TU } };
320  return C;
321}
322
323std::pair<FieldDecl *, SourceLocation>
324cxcursor::getCursorMemberRef(CXCursor C) {
325  assert(C.kind == CXCursor_MemberRef);
326  return std::make_pair(static_cast<FieldDecl *>(C.data[0]),
327                        SourceLocation::getFromRawEncoding(
328                                       reinterpret_cast<uintptr_t>(C.data[1])));
329}
330
331CXCursor cxcursor::MakeCursorCXXBaseSpecifier(CXXBaseSpecifier *B,
332                                              CXTranslationUnit TU){
333  CXCursor C = { CXCursor_CXXBaseSpecifier, { B, 0, TU } };
334  return C;
335}
336
337CXXBaseSpecifier *cxcursor::getCursorCXXBaseSpecifier(CXCursor C) {
338  assert(C.kind == CXCursor_CXXBaseSpecifier);
339  return static_cast<CXXBaseSpecifier*>(C.data[0]);
340}
341
342CXCursor cxcursor::MakePreprocessingDirectiveCursor(SourceRange Range,
343                                                    CXTranslationUnit TU) {
344  CXCursor C = { CXCursor_PreprocessingDirective,
345                 { reinterpret_cast<void *>(Range.getBegin().getRawEncoding()),
346                   reinterpret_cast<void *>(Range.getEnd().getRawEncoding()),
347                   TU }
348               };
349  return C;
350}
351
352SourceRange cxcursor::getCursorPreprocessingDirective(CXCursor C) {
353  assert(C.kind == CXCursor_PreprocessingDirective);
354  return SourceRange(SourceLocation::getFromRawEncoding(
355                                      reinterpret_cast<uintptr_t> (C.data[0])),
356                     SourceLocation::getFromRawEncoding(
357                                      reinterpret_cast<uintptr_t> (C.data[1])));
358}
359
360CXCursor cxcursor::MakeMacroDefinitionCursor(MacroDefinition *MI,
361                                             CXTranslationUnit TU) {
362  CXCursor C = { CXCursor_MacroDefinition, { MI, 0, TU } };
363  return C;
364}
365
366MacroDefinition *cxcursor::getCursorMacroDefinition(CXCursor C) {
367  assert(C.kind == CXCursor_MacroDefinition);
368  return static_cast<MacroDefinition *>(C.data[0]);
369}
370
371CXCursor cxcursor::MakeMacroInstantiationCursor(MacroInstantiation *MI,
372                                                CXTranslationUnit TU) {
373  CXCursor C = { CXCursor_MacroInstantiation, { MI, 0, TU } };
374  return C;
375}
376
377MacroInstantiation *cxcursor::getCursorMacroInstantiation(CXCursor C) {
378  assert(C.kind == CXCursor_MacroInstantiation);
379  return static_cast<MacroInstantiation *>(C.data[0]);
380}
381
382CXCursor cxcursor::MakeInclusionDirectiveCursor(InclusionDirective *ID,
383                                                CXTranslationUnit TU) {
384  CXCursor C = { CXCursor_InclusionDirective, { ID, 0, TU } };
385  return C;
386}
387
388InclusionDirective *cxcursor::getCursorInclusionDirective(CXCursor C) {
389  assert(C.kind == CXCursor_InclusionDirective);
390  return static_cast<InclusionDirective *>(C.data[0]);
391}
392
393CXCursor cxcursor::MakeCursorLabelRef(LabelStmt *Label, SourceLocation Loc,
394                                      CXTranslationUnit TU) {
395
396  assert(Label && TU && "Invalid arguments!");
397  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
398  CXCursor C = { CXCursor_LabelRef, { Label, RawLoc, TU } };
399  return C;
400}
401
402std::pair<LabelStmt*, SourceLocation>
403cxcursor::getCursorLabelRef(CXCursor C) {
404  assert(C.kind == CXCursor_LabelRef);
405  return std::make_pair(static_cast<LabelStmt *>(C.data[0]),
406                        SourceLocation::getFromRawEncoding(
407                                       reinterpret_cast<uintptr_t>(C.data[1])));
408}
409
410CXCursor cxcursor::MakeCursorOverloadedDeclRef(OverloadExpr *E,
411                                               CXTranslationUnit TU) {
412  assert(E && TU && "Invalid arguments!");
413  OverloadedDeclRefStorage Storage(E);
414  void *RawLoc = reinterpret_cast<void *>(E->getNameLoc().getRawEncoding());
415  CXCursor C = {
416                 CXCursor_OverloadedDeclRef,
417                 { Storage.getOpaqueValue(), RawLoc, TU }
418               };
419  return C;
420}
421
422CXCursor cxcursor::MakeCursorOverloadedDeclRef(Decl *D,
423                                               SourceLocation Loc,
424                                               CXTranslationUnit TU) {
425  assert(D && TU && "Invalid arguments!");
426  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
427  OverloadedDeclRefStorage Storage(D);
428  CXCursor C = {
429    CXCursor_OverloadedDeclRef,
430    { Storage.getOpaqueValue(), RawLoc, TU }
431  };
432  return C;
433}
434
435CXCursor cxcursor::MakeCursorOverloadedDeclRef(TemplateName Name,
436                                               SourceLocation Loc,
437                                               CXTranslationUnit TU) {
438  assert(Name.getAsOverloadedTemplate() && TU && "Invalid arguments!");
439  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
440  OverloadedDeclRefStorage Storage(Name.getAsOverloadedTemplate());
441  CXCursor C = {
442    CXCursor_OverloadedDeclRef,
443    { Storage.getOpaqueValue(), RawLoc, TU }
444  };
445  return C;
446}
447
448std::pair<cxcursor::OverloadedDeclRefStorage, SourceLocation>
449cxcursor::getCursorOverloadedDeclRef(CXCursor C) {
450  assert(C.kind == CXCursor_OverloadedDeclRef);
451  return std::make_pair(OverloadedDeclRefStorage::getFromOpaqueValue(C.data[0]),
452                        SourceLocation::getFromRawEncoding(
453                                       reinterpret_cast<uintptr_t>(C.data[1])));
454}
455
456Decl *cxcursor::getCursorDecl(CXCursor Cursor) {
457  return (Decl *)Cursor.data[0];
458}
459
460Expr *cxcursor::getCursorExpr(CXCursor Cursor) {
461  return dyn_cast_or_null<Expr>(getCursorStmt(Cursor));
462}
463
464Stmt *cxcursor::getCursorStmt(CXCursor Cursor) {
465  if (Cursor.kind == CXCursor_ObjCSuperClassRef ||
466      Cursor.kind == CXCursor_ObjCProtocolRef ||
467      Cursor.kind == CXCursor_ObjCClassRef)
468    return 0;
469
470  return (Stmt *)Cursor.data[1];
471}
472
473Attr *cxcursor::getCursorAttr(CXCursor Cursor) {
474  return (Attr *)Cursor.data[1];
475}
476
477ASTContext &cxcursor::getCursorContext(CXCursor Cursor) {
478  return getCursorASTUnit(Cursor)->getASTContext();
479}
480
481ASTUnit *cxcursor::getCursorASTUnit(CXCursor Cursor) {
482  return static_cast<ASTUnit *>(static_cast<CXTranslationUnit>(Cursor.data[2])
483                                  ->TUData);
484}
485
486CXTranslationUnit cxcursor::getCursorTU(CXCursor Cursor) {
487  return static_cast<CXTranslationUnit>(Cursor.data[2]);
488}
489
490bool cxcursor::operator==(CXCursor X, CXCursor Y) {
491  return X.kind == Y.kind && X.data[0] == Y.data[0] && X.data[1] == Y.data[1] &&
492         X.data[2] == Y.data[2];
493}
494
495// FIXME: Remove once we can model DeclGroups and their appropriate ranges
496// properly in the ASTs.
497bool cxcursor::isFirstInDeclGroup(CXCursor C) {
498  assert(clang_isDeclaration(C.kind));
499  return ((uintptr_t) (C.data[1])) != 0;
500}
501
502//===----------------------------------------------------------------------===//
503// CXCursorSet.
504//===----------------------------------------------------------------------===//
505
506typedef llvm::DenseMap<CXCursor, unsigned> CXCursorSet_Impl;
507
508static inline CXCursorSet packCXCursorSet(CXCursorSet_Impl *setImpl) {
509  return (CXCursorSet) setImpl;
510}
511static inline CXCursorSet_Impl *unpackCXCursorSet(CXCursorSet set) {
512  return (CXCursorSet_Impl*) set;
513}
514namespace llvm {
515template<> struct DenseMapInfo<CXCursor> {
516public:
517  static inline CXCursor getEmptyKey() {
518    return MakeCXCursorInvalid(CXCursor_InvalidFile);
519  }
520  static inline CXCursor getTombstoneKey() {
521    return MakeCXCursorInvalid(CXCursor_NoDeclFound);
522  }
523  static inline unsigned getHashValue(const CXCursor &cursor) {
524    return llvm::DenseMapInfo<std::pair<void*,void*> >
525      ::getHashValue(std::make_pair(cursor.data[0], cursor.data[1]));
526  }
527  static inline bool isEqual(const CXCursor &x, const CXCursor &y) {
528    return x.kind == y.kind &&
529           x.data[0] == y.data[0] &&
530           x.data[1] == y.data[1];
531  }
532};
533}
534
535extern "C" {
536CXCursorSet clang_createCXCursorSet() {
537  return packCXCursorSet(new CXCursorSet_Impl());
538}
539
540void clang_disposeCXCursorSet(CXCursorSet set) {
541  delete unpackCXCursorSet(set);
542}
543
544unsigned clang_CXCursorSet_contains(CXCursorSet set, CXCursor cursor) {
545  CXCursorSet_Impl *setImpl = unpackCXCursorSet(set);
546  if (!setImpl)
547    return 0;
548  return setImpl->find(cursor) == setImpl->end();
549}
550
551unsigned clang_CXCursorSet_insert(CXCursorSet set, CXCursor cursor) {
552  // Do not insert invalid cursors into the set.
553  if (cursor.kind >= CXCursor_FirstInvalid &&
554      cursor.kind <= CXCursor_LastInvalid)
555    return 1;
556
557  CXCursorSet_Impl *setImpl = unpackCXCursorSet(set);
558  if (!setImpl)
559    return 1;
560  unsigned &entry = (*setImpl)[cursor];
561  unsigned flag = entry == 0 ? 1 : 0;
562  entry = 1;
563  return flag;
564}
565} // end: extern "C"
566