CXCursor.cpp revision ad762fcdc16b9e4705b12b09d92b8c026212b906 
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::GNUNullExprClass:
134  case Stmt::CXXStaticCastExprClass:
135  case Stmt::CXXDynamicCastExprClass:
136  case Stmt::CXXReinterpretCastExprClass:
137  case Stmt::CXXConstCastExprClass:
138  case Stmt::CXXFunctionalCastExprClass:
139  case Stmt::CXXTypeidExprClass:
140  case Stmt::CXXUuidofExprClass:
141  case Stmt::CXXBoolLiteralExprClass:
142  case Stmt::CXXNullPtrLiteralExprClass:
143  case Stmt::CXXThisExprClass:
144  case Stmt::CXXThrowExprClass:
145  case Stmt::CXXDefaultArgExprClass:
146  case Stmt::CXXScalarValueInitExprClass:
147  case Stmt::CXXNewExprClass:
148  case Stmt::CXXDeleteExprClass:
149  case Stmt::CXXPseudoDestructorExprClass:
150  case Stmt::UnresolvedLookupExprClass:
151  case Stmt::UnaryTypeTraitExprClass:
152  case Stmt::BinaryTypeTraitExprClass:
153  case Stmt::DependentScopeDeclRefExprClass:
154  case Stmt::CXXBindTemporaryExprClass:
155  case Stmt::ExprWithCleanupsClass:
156  case Stmt::CXXUnresolvedConstructExprClass:
157  case Stmt::CXXDependentScopeMemberExprClass:
158  case Stmt::UnresolvedMemberExprClass:
159  case Stmt::CXXNoexceptExprClass:
160  case Stmt::ObjCStringLiteralClass:
161  case Stmt::ObjCEncodeExprClass:
162  case Stmt::ObjCSelectorExprClass:
163  case Stmt::ObjCProtocolExprClass:
164  case Stmt::ObjCIsaExprClass:
165  case Stmt::ShuffleVectorExprClass:
166  case Stmt::BlockExprClass:
167  case Stmt::OpaqueValueExprClass:
168  case Stmt::PackExpansionExprClass:
169  case Stmt::SizeOfPackExprClass:
170    K = CXCursor_UnexposedExpr;
171    break;
172
173  case Stmt::DeclRefExprClass:
174  case Stmt::BlockDeclRefExprClass:
175  case Stmt::SubstNonTypeTemplateParmPackExprClass:
176    // FIXME: UnresolvedLookupExpr?
177    // FIXME: DependentScopeDeclRefExpr?
178    K = CXCursor_DeclRefExpr;
179    break;
180
181  case Stmt::MemberExprClass:
182  case Stmt::ObjCIvarRefExprClass:
183  case Stmt::ObjCPropertyRefExprClass:
184    // FIXME: UnresolvedMemberExpr?
185    // FIXME: CXXDependentScopeMemberExpr?
186    K = CXCursor_MemberRefExpr;
187    break;
188
189  case Stmt::CallExprClass:
190  case Stmt::CXXOperatorCallExprClass:
191  case Stmt::CXXMemberCallExprClass:
192  case Stmt::CUDAKernelCallExprClass:
193  case Stmt::CXXConstructExprClass:
194  case Stmt::CXXTemporaryObjectExprClass:
195    // FIXME: CXXUnresolvedConstructExpr
196    K = CXCursor_CallExpr;
197    break;
198
199  case Stmt::ObjCMessageExprClass:
200    K = CXCursor_ObjCMessageExpr;
201    break;
202  }
203
204  CXCursor C = { K, { Parent, S, TU } };
205  return C;
206}
207
208CXCursor cxcursor::MakeCursorObjCSuperClassRef(ObjCInterfaceDecl *Super,
209                                               SourceLocation Loc,
210                                               CXTranslationUnit TU) {
211  assert(Super && TU && "Invalid arguments!");
212  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
213  CXCursor C = { CXCursor_ObjCSuperClassRef, { Super, RawLoc, TU } };
214  return C;
215}
216
217std::pair<ObjCInterfaceDecl *, SourceLocation>
218cxcursor::getCursorObjCSuperClassRef(CXCursor C) {
219  assert(C.kind == CXCursor_ObjCSuperClassRef);
220  return std::make_pair(static_cast<ObjCInterfaceDecl *>(C.data[0]),
221           SourceLocation::getFromRawEncoding(
222                                      reinterpret_cast<uintptr_t>(C.data[1])));
223}
224
225CXCursor cxcursor::MakeCursorObjCProtocolRef(ObjCProtocolDecl *Super,
226                                             SourceLocation Loc,
227                                             CXTranslationUnit TU) {
228  assert(Super && TU && "Invalid arguments!");
229  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
230  CXCursor C = { CXCursor_ObjCProtocolRef, { Super, RawLoc, TU } };
231  return C;
232}
233
234std::pair<ObjCProtocolDecl *, SourceLocation>
235cxcursor::getCursorObjCProtocolRef(CXCursor C) {
236  assert(C.kind == CXCursor_ObjCProtocolRef);
237  return std::make_pair(static_cast<ObjCProtocolDecl *>(C.data[0]),
238           SourceLocation::getFromRawEncoding(
239                                      reinterpret_cast<uintptr_t>(C.data[1])));
240}
241
242CXCursor cxcursor::MakeCursorObjCClassRef(ObjCInterfaceDecl *Class,
243                                          SourceLocation Loc,
244                                          CXTranslationUnit TU) {
245  // 'Class' can be null for invalid code.
246  if (!Class)
247    return MakeCXCursorInvalid(CXCursor_InvalidCode);
248  assert(TU && "Invalid arguments!");
249  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
250  CXCursor C = { CXCursor_ObjCClassRef, { Class, RawLoc, TU } };
251  return C;
252}
253
254std::pair<ObjCInterfaceDecl *, SourceLocation>
255cxcursor::getCursorObjCClassRef(CXCursor C) {
256  assert(C.kind == CXCursor_ObjCClassRef);
257  return std::make_pair(static_cast<ObjCInterfaceDecl *>(C.data[0]),
258           SourceLocation::getFromRawEncoding(
259                                      reinterpret_cast<uintptr_t>(C.data[1])));
260}
261
262CXCursor cxcursor::MakeCursorTypeRef(TypeDecl *Type, SourceLocation Loc,
263                                     CXTranslationUnit TU) {
264  assert(Type && TU && "Invalid arguments!");
265  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
266  CXCursor C = { CXCursor_TypeRef, { Type, RawLoc, TU } };
267  return C;
268}
269
270std::pair<TypeDecl *, SourceLocation>
271cxcursor::getCursorTypeRef(CXCursor C) {
272  assert(C.kind == CXCursor_TypeRef);
273  return std::make_pair(static_cast<TypeDecl *>(C.data[0]),
274           SourceLocation::getFromRawEncoding(
275                                      reinterpret_cast<uintptr_t>(C.data[1])));
276}
277
278CXCursor cxcursor::MakeCursorTemplateRef(TemplateDecl *Template,
279                                         SourceLocation Loc,
280                                         CXTranslationUnit TU) {
281  assert(Template && TU && "Invalid arguments!");
282  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
283  CXCursor C = { CXCursor_TemplateRef, { Template, RawLoc, TU } };
284  return C;
285}
286
287std::pair<TemplateDecl *, SourceLocation>
288cxcursor::getCursorTemplateRef(CXCursor C) {
289  assert(C.kind == CXCursor_TemplateRef);
290  return std::make_pair(static_cast<TemplateDecl *>(C.data[0]),
291                        SourceLocation::getFromRawEncoding(
292                                       reinterpret_cast<uintptr_t>(C.data[1])));
293}
294
295CXCursor cxcursor::MakeCursorNamespaceRef(NamedDecl *NS, SourceLocation Loc,
296                                          CXTranslationUnit TU) {
297
298  assert(NS && (isa<NamespaceDecl>(NS) || isa<NamespaceAliasDecl>(NS)) && TU &&
299         "Invalid arguments!");
300  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
301  CXCursor C = { CXCursor_NamespaceRef, { NS, RawLoc, TU } };
302  return C;
303}
304
305std::pair<NamedDecl *, SourceLocation>
306cxcursor::getCursorNamespaceRef(CXCursor C) {
307  assert(C.kind == CXCursor_NamespaceRef);
308  return std::make_pair(static_cast<NamedDecl *>(C.data[0]),
309                        SourceLocation::getFromRawEncoding(
310                                       reinterpret_cast<uintptr_t>(C.data[1])));
311}
312
313CXCursor cxcursor::MakeCursorMemberRef(FieldDecl *Field, SourceLocation Loc,
314                                       CXTranslationUnit TU) {
315
316  assert(Field && TU && "Invalid arguments!");
317  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
318  CXCursor C = { CXCursor_MemberRef, { Field, RawLoc, TU } };
319  return C;
320}
321
322std::pair<FieldDecl *, SourceLocation>
323cxcursor::getCursorMemberRef(CXCursor C) {
324  assert(C.kind == CXCursor_MemberRef);
325  return std::make_pair(static_cast<FieldDecl *>(C.data[0]),
326                        SourceLocation::getFromRawEncoding(
327                                       reinterpret_cast<uintptr_t>(C.data[1])));
328}
329
330CXCursor cxcursor::MakeCursorCXXBaseSpecifier(CXXBaseSpecifier *B,
331                                              CXTranslationUnit TU){
332  CXCursor C = { CXCursor_CXXBaseSpecifier, { B, 0, TU } };
333  return C;
334}
335
336CXXBaseSpecifier *cxcursor::getCursorCXXBaseSpecifier(CXCursor C) {
337  assert(C.kind == CXCursor_CXXBaseSpecifier);
338  return static_cast<CXXBaseSpecifier*>(C.data[0]);
339}
340
341CXCursor cxcursor::MakePreprocessingDirectiveCursor(SourceRange Range,
342                                                    CXTranslationUnit TU) {
343  CXCursor C = { CXCursor_PreprocessingDirective,
344                 { reinterpret_cast<void *>(Range.getBegin().getRawEncoding()),
345                   reinterpret_cast<void *>(Range.getEnd().getRawEncoding()),
346                   TU }
347               };
348  return C;
349}
350
351SourceRange cxcursor::getCursorPreprocessingDirective(CXCursor C) {
352  assert(C.kind == CXCursor_PreprocessingDirective);
353  return SourceRange(SourceLocation::getFromRawEncoding(
354                                      reinterpret_cast<uintptr_t> (C.data[0])),
355                     SourceLocation::getFromRawEncoding(
356                                      reinterpret_cast<uintptr_t> (C.data[1])));
357}
358
359CXCursor cxcursor::MakeMacroDefinitionCursor(MacroDefinition *MI,
360                                             CXTranslationUnit TU) {
361  CXCursor C = { CXCursor_MacroDefinition, { MI, 0, TU } };
362  return C;
363}
364
365MacroDefinition *cxcursor::getCursorMacroDefinition(CXCursor C) {
366  assert(C.kind == CXCursor_MacroDefinition);
367  return static_cast<MacroDefinition *>(C.data[0]);
368}
369
370CXCursor cxcursor::MakeMacroInstantiationCursor(MacroInstantiation *MI,
371                                                CXTranslationUnit TU) {
372  CXCursor C = { CXCursor_MacroInstantiation, { MI, 0, TU } };
373  return C;
374}
375
376MacroInstantiation *cxcursor::getCursorMacroInstantiation(CXCursor C) {
377  assert(C.kind == CXCursor_MacroInstantiation);
378  return static_cast<MacroInstantiation *>(C.data[0]);
379}
380
381CXCursor cxcursor::MakeInclusionDirectiveCursor(InclusionDirective *ID,
382                                                CXTranslationUnit TU) {
383  CXCursor C = { CXCursor_InclusionDirective, { ID, 0, TU } };
384  return C;
385}
386
387InclusionDirective *cxcursor::getCursorInclusionDirective(CXCursor C) {
388  assert(C.kind == CXCursor_InclusionDirective);
389  return static_cast<InclusionDirective *>(C.data[0]);
390}
391
392CXCursor cxcursor::MakeCursorLabelRef(LabelStmt *Label, SourceLocation Loc,
393                                      CXTranslationUnit TU) {
394
395  assert(Label && TU && "Invalid arguments!");
396  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
397  CXCursor C = { CXCursor_LabelRef, { Label, RawLoc, TU } };
398  return C;
399}
400
401std::pair<LabelStmt*, SourceLocation>
402cxcursor::getCursorLabelRef(CXCursor C) {
403  assert(C.kind == CXCursor_LabelRef);
404  return std::make_pair(static_cast<LabelStmt *>(C.data[0]),
405                        SourceLocation::getFromRawEncoding(
406                                       reinterpret_cast<uintptr_t>(C.data[1])));
407}
408
409CXCursor cxcursor::MakeCursorOverloadedDeclRef(OverloadExpr *E,
410                                               CXTranslationUnit TU) {
411  assert(E && TU && "Invalid arguments!");
412  OverloadedDeclRefStorage Storage(E);
413  void *RawLoc = reinterpret_cast<void *>(E->getNameLoc().getRawEncoding());
414  CXCursor C = {
415                 CXCursor_OverloadedDeclRef,
416                 { Storage.getOpaqueValue(), RawLoc, TU }
417               };
418  return C;
419}
420
421CXCursor cxcursor::MakeCursorOverloadedDeclRef(Decl *D,
422                                               SourceLocation Loc,
423                                               CXTranslationUnit TU) {
424  assert(D && TU && "Invalid arguments!");
425  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
426  OverloadedDeclRefStorage Storage(D);
427  CXCursor C = {
428    CXCursor_OverloadedDeclRef,
429    { Storage.getOpaqueValue(), RawLoc, TU }
430  };
431  return C;
432}
433
434CXCursor cxcursor::MakeCursorOverloadedDeclRef(TemplateName Name,
435                                               SourceLocation Loc,
436                                               CXTranslationUnit TU) {
437  assert(Name.getAsOverloadedTemplate() && TU && "Invalid arguments!");
438  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
439  OverloadedDeclRefStorage Storage(Name.getAsOverloadedTemplate());
440  CXCursor C = {
441    CXCursor_OverloadedDeclRef,
442    { Storage.getOpaqueValue(), RawLoc, TU }
443  };
444  return C;
445}
446
447std::pair<cxcursor::OverloadedDeclRefStorage, SourceLocation>
448cxcursor::getCursorOverloadedDeclRef(CXCursor C) {
449  assert(C.kind == CXCursor_OverloadedDeclRef);
450  return std::make_pair(OverloadedDeclRefStorage::getFromOpaqueValue(C.data[0]),
451                        SourceLocation::getFromRawEncoding(
452                                       reinterpret_cast<uintptr_t>(C.data[1])));
453}
454
455Decl *cxcursor::getCursorDecl(CXCursor Cursor) {
456  return (Decl *)Cursor.data[0];
457}
458
459Expr *cxcursor::getCursorExpr(CXCursor Cursor) {
460  return dyn_cast_or_null<Expr>(getCursorStmt(Cursor));
461}
462
463Stmt *cxcursor::getCursorStmt(CXCursor Cursor) {
464  if (Cursor.kind == CXCursor_ObjCSuperClassRef ||
465      Cursor.kind == CXCursor_ObjCProtocolRef ||
466      Cursor.kind == CXCursor_ObjCClassRef)
467    return 0;
468
469  return (Stmt *)Cursor.data[1];
470}
471
472Attr *cxcursor::getCursorAttr(CXCursor Cursor) {
473  return (Attr *)Cursor.data[1];
474}
475
476ASTContext &cxcursor::getCursorContext(CXCursor Cursor) {
477  return getCursorASTUnit(Cursor)->getASTContext();
478}
479
480ASTUnit *cxcursor::getCursorASTUnit(CXCursor Cursor) {
481  return static_cast<ASTUnit *>(static_cast<CXTranslationUnit>(Cursor.data[2])
482                                  ->TUData);
483}
484
485CXTranslationUnit cxcursor::getCursorTU(CXCursor Cursor) {
486  return static_cast<CXTranslationUnit>(Cursor.data[2]);
487}
488
489bool cxcursor::operator==(CXCursor X, CXCursor Y) {
490  return X.kind == Y.kind && X.data[0] == Y.data[0] && X.data[1] == Y.data[1] &&
491         X.data[2] == Y.data[2];
492}
493
494// FIXME: Remove once we can model DeclGroups and their appropriate ranges
495// properly in the ASTs.
496bool cxcursor::isFirstInDeclGroup(CXCursor C) {
497  assert(clang_isDeclaration(C.kind));
498  return ((uintptr_t) (C.data[1])) != 0;
499}
500
501//===----------------------------------------------------------------------===//
502// CXCursorSet.
503//===----------------------------------------------------------------------===//
504
505typedef llvm::DenseMap<CXCursor, unsigned> CXCursorSet_Impl;
506
507static inline CXCursorSet packCXCursorSet(CXCursorSet_Impl *setImpl) {
508  return (CXCursorSet) setImpl;
509}
510static inline CXCursorSet_Impl *unpackCXCursorSet(CXCursorSet set) {
511  return (CXCursorSet_Impl*) set;
512}
513namespace llvm {
514template<> struct DenseMapInfo<CXCursor> {
515public:
516  static inline CXCursor getEmptyKey() {
517    return MakeCXCursorInvalid(CXCursor_InvalidFile);
518  }
519  static inline CXCursor getTombstoneKey() {
520    return MakeCXCursorInvalid(CXCursor_NoDeclFound);
521  }
522  static inline unsigned getHashValue(const CXCursor &cursor) {
523    return llvm::DenseMapInfo<std::pair<void*,void*> >
524      ::getHashValue(std::make_pair(cursor.data[0], cursor.data[1]));
525  }
526  static inline bool isEqual(const CXCursor &x, const CXCursor &y) {
527    return x.kind == y.kind &&
528           x.data[0] == y.data[0] &&
529           x.data[1] == y.data[1];
530  }
531};
532}
533
534extern "C" {
535CXCursorSet clang_createCXCursorSet() {
536  return packCXCursorSet(new CXCursorSet_Impl());
537}
538
539void clang_disposeCXCursorSet(CXCursorSet set) {
540  delete unpackCXCursorSet(set);
541}
542
543unsigned clang_CXCursorSet_contains(CXCursorSet set, CXCursor cursor) {
544  CXCursorSet_Impl *setImpl = unpackCXCursorSet(set);
545  if (!setImpl)
546    return 0;
547  return setImpl->find(cursor) == setImpl->end();
548}
549
550unsigned clang_CXCursorSet_insert(CXCursorSet set, CXCursor cursor) {
551  // Do not insert invalid cursors into the set.
552  if (cursor.kind >= CXCursor_FirstInvalid &&
553      cursor.kind <= CXCursor_LastInvalid)
554    return 1;
555
556  CXCursorSet_Impl *setImpl = unpackCXCursorSet(set);
557  if (!setImpl)
558    return 1;
559  unsigned &entry = (*setImpl)[cursor];
560  unsigned flag = entry == 0 ? 1 : 0;
561  entry = 1;
562  return flag;
563}
564} // end: extern "C"
565