CXCursor.cpp revision dec0984fce504a39a7f085774fb67cfd9957be58 
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::SwitchCaseClass:
90  case Stmt::AsmStmtClass:
91  case Stmt::ObjCAtTryStmtClass:
92  case Stmt::ObjCAtCatchStmtClass:
93  case Stmt::ObjCAtFinallyStmtClass:
94  case Stmt::ObjCAtThrowStmtClass:
95  case Stmt::ObjCAtSynchronizedStmtClass:
96  case Stmt::ObjCForCollectionStmtClass:
97  case Stmt::CXXCatchStmtClass:
98  case Stmt::CXXTryStmtClass:
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::SizeOfAlignOfExprClass:
116  case Stmt::ArraySubscriptExprClass:
117  case Stmt::BinaryOperatorClass:
118  case Stmt::CompoundAssignOperatorClass:
119  case Stmt::ConditionalOperatorClass:
120  case Stmt::ImplicitCastExprClass:
121  case Stmt::CStyleCastExprClass:
122  case Stmt::CompoundLiteralExprClass:
123  case Stmt::ExtVectorElementExprClass:
124  case Stmt::InitListExprClass:
125  case Stmt::DesignatedInitExprClass:
126  case Stmt::ImplicitValueInitExprClass:
127  case Stmt::ParenListExprClass:
128  case Stmt::VAArgExprClass:
129  case Stmt::AddrLabelExprClass:
130  case Stmt::StmtExprClass:
131  case Stmt::ChooseExprClass:
132  case Stmt::GNUNullExprClass:
133  case Stmt::CXXStaticCastExprClass:
134  case Stmt::CXXDynamicCastExprClass:
135  case Stmt::CXXReinterpretCastExprClass:
136  case Stmt::CXXConstCastExprClass:
137  case Stmt::CXXFunctionalCastExprClass:
138  case Stmt::CXXTypeidExprClass:
139  case Stmt::CXXUuidofExprClass:
140  case Stmt::CXXBoolLiteralExprClass:
141  case Stmt::CXXNullPtrLiteralExprClass:
142  case Stmt::CXXThisExprClass:
143  case Stmt::CXXThrowExprClass:
144  case Stmt::CXXDefaultArgExprClass:
145  case Stmt::CXXScalarValueInitExprClass:
146  case Stmt::CXXNewExprClass:
147  case Stmt::CXXDeleteExprClass:
148  case Stmt::CXXPseudoDestructorExprClass:
149  case Stmt::UnresolvedLookupExprClass:
150  case Stmt::UnaryTypeTraitExprClass:
151  case Stmt::BinaryTypeTraitExprClass:
152  case Stmt::DependentScopeDeclRefExprClass:
153  case Stmt::CXXBindTemporaryExprClass:
154  case Stmt::ExprWithCleanupsClass:
155  case Stmt::CXXUnresolvedConstructExprClass:
156  case Stmt::CXXDependentScopeMemberExprClass:
157  case Stmt::UnresolvedMemberExprClass:
158  case Stmt::CXXNoexceptExprClass:
159  case Stmt::ObjCStringLiteralClass:
160  case Stmt::ObjCEncodeExprClass:
161  case Stmt::ObjCSelectorExprClass:
162  case Stmt::ObjCProtocolExprClass:
163  case Stmt::ObjCIsaExprClass:
164  case Stmt::ShuffleVectorExprClass:
165  case Stmt::BlockExprClass:
166  case Stmt::OpaqueValueExprClass:
167  case Stmt::PackExpansionExprClass:
168  case Stmt::SizeOfPackExprClass:
169    K = CXCursor_UnexposedExpr;
170    break;
171
172  case Stmt::DeclRefExprClass:
173  case Stmt::BlockDeclRefExprClass:
174  case Stmt::SubstNonTypeTemplateParmPackExprClass:
175    // FIXME: UnresolvedLookupExpr?
176    // FIXME: DependentScopeDeclRefExpr?
177    K = CXCursor_DeclRefExpr;
178    break;
179
180  case Stmt::MemberExprClass:
181  case Stmt::ObjCIvarRefExprClass:
182  case Stmt::ObjCPropertyRefExprClass:
183    // FIXME: UnresolvedMemberExpr?
184    // FIXME: CXXDependentScopeMemberExpr?
185    K = CXCursor_MemberRefExpr;
186    break;
187
188  case Stmt::CallExprClass:
189  case Stmt::CXXOperatorCallExprClass:
190  case Stmt::CXXMemberCallExprClass:
191  case Stmt::CXXConstructExprClass:
192  case Stmt::CXXTemporaryObjectExprClass:
193    // FIXME: CXXUnresolvedConstructExpr
194    K = CXCursor_CallExpr;
195    break;
196
197  case Stmt::ObjCMessageExprClass:
198    K = CXCursor_ObjCMessageExpr;
199    break;
200  }
201
202  CXCursor C = { K, { Parent, S, TU } };
203  return C;
204}
205
206CXCursor cxcursor::MakeCursorObjCSuperClassRef(ObjCInterfaceDecl *Super,
207                                               SourceLocation Loc,
208                                               CXTranslationUnit TU) {
209  assert(Super && TU && "Invalid arguments!");
210  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
211  CXCursor C = { CXCursor_ObjCSuperClassRef, { Super, RawLoc, TU } };
212  return C;
213}
214
215std::pair<ObjCInterfaceDecl *, SourceLocation>
216cxcursor::getCursorObjCSuperClassRef(CXCursor C) {
217  assert(C.kind == CXCursor_ObjCSuperClassRef);
218  return std::make_pair(static_cast<ObjCInterfaceDecl *>(C.data[0]),
219           SourceLocation::getFromRawEncoding(
220                                      reinterpret_cast<uintptr_t>(C.data[1])));
221}
222
223CXCursor cxcursor::MakeCursorObjCProtocolRef(ObjCProtocolDecl *Super,
224                                             SourceLocation Loc,
225                                             CXTranslationUnit TU) {
226  assert(Super && TU && "Invalid arguments!");
227  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
228  CXCursor C = { CXCursor_ObjCProtocolRef, { Super, RawLoc, TU } };
229  return C;
230}
231
232std::pair<ObjCProtocolDecl *, SourceLocation>
233cxcursor::getCursorObjCProtocolRef(CXCursor C) {
234  assert(C.kind == CXCursor_ObjCProtocolRef);
235  return std::make_pair(static_cast<ObjCProtocolDecl *>(C.data[0]),
236           SourceLocation::getFromRawEncoding(
237                                      reinterpret_cast<uintptr_t>(C.data[1])));
238}
239
240CXCursor cxcursor::MakeCursorObjCClassRef(ObjCInterfaceDecl *Class,
241                                          SourceLocation Loc,
242                                          CXTranslationUnit TU) {
243  // 'Class' can be null for invalid code.
244  if (!Class)
245    return MakeCXCursorInvalid(CXCursor_InvalidCode);
246  assert(TU && "Invalid arguments!");
247  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
248  CXCursor C = { CXCursor_ObjCClassRef, { Class, RawLoc, TU } };
249  return C;
250}
251
252std::pair<ObjCInterfaceDecl *, SourceLocation>
253cxcursor::getCursorObjCClassRef(CXCursor C) {
254  assert(C.kind == CXCursor_ObjCClassRef);
255  return std::make_pair(static_cast<ObjCInterfaceDecl *>(C.data[0]),
256           SourceLocation::getFromRawEncoding(
257                                      reinterpret_cast<uintptr_t>(C.data[1])));
258}
259
260CXCursor cxcursor::MakeCursorTypeRef(TypeDecl *Type, SourceLocation Loc,
261                                     CXTranslationUnit TU) {
262  assert(Type && TU && "Invalid arguments!");
263  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
264  CXCursor C = { CXCursor_TypeRef, { Type, RawLoc, TU } };
265  return C;
266}
267
268std::pair<TypeDecl *, SourceLocation>
269cxcursor::getCursorTypeRef(CXCursor C) {
270  assert(C.kind == CXCursor_TypeRef);
271  return std::make_pair(static_cast<TypeDecl *>(C.data[0]),
272           SourceLocation::getFromRawEncoding(
273                                      reinterpret_cast<uintptr_t>(C.data[1])));
274}
275
276CXCursor cxcursor::MakeCursorTemplateRef(TemplateDecl *Template,
277                                         SourceLocation Loc,
278                                         CXTranslationUnit TU) {
279  assert(Template && TU && "Invalid arguments!");
280  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
281  CXCursor C = { CXCursor_TemplateRef, { Template, RawLoc, TU } };
282  return C;
283}
284
285std::pair<TemplateDecl *, SourceLocation>
286cxcursor::getCursorTemplateRef(CXCursor C) {
287  assert(C.kind == CXCursor_TemplateRef);
288  return std::make_pair(static_cast<TemplateDecl *>(C.data[0]),
289                        SourceLocation::getFromRawEncoding(
290                                       reinterpret_cast<uintptr_t>(C.data[1])));
291}
292
293CXCursor cxcursor::MakeCursorNamespaceRef(NamedDecl *NS, SourceLocation Loc,
294                                          CXTranslationUnit TU) {
295
296  assert(NS && (isa<NamespaceDecl>(NS) || isa<NamespaceAliasDecl>(NS)) && TU &&
297         "Invalid arguments!");
298  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
299  CXCursor C = { CXCursor_NamespaceRef, { NS, RawLoc, TU } };
300  return C;
301}
302
303std::pair<NamedDecl *, SourceLocation>
304cxcursor::getCursorNamespaceRef(CXCursor C) {
305  assert(C.kind == CXCursor_NamespaceRef);
306  return std::make_pair(static_cast<NamedDecl *>(C.data[0]),
307                        SourceLocation::getFromRawEncoding(
308                                       reinterpret_cast<uintptr_t>(C.data[1])));
309}
310
311CXCursor cxcursor::MakeCursorMemberRef(FieldDecl *Field, SourceLocation Loc,
312                                       CXTranslationUnit TU) {
313
314  assert(Field && TU && "Invalid arguments!");
315  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
316  CXCursor C = { CXCursor_MemberRef, { Field, RawLoc, TU } };
317  return C;
318}
319
320std::pair<FieldDecl *, SourceLocation>
321cxcursor::getCursorMemberRef(CXCursor C) {
322  assert(C.kind == CXCursor_MemberRef);
323  return std::make_pair(static_cast<FieldDecl *>(C.data[0]),
324                        SourceLocation::getFromRawEncoding(
325                                       reinterpret_cast<uintptr_t>(C.data[1])));
326}
327
328CXCursor cxcursor::MakeCursorCXXBaseSpecifier(CXXBaseSpecifier *B,
329                                              CXTranslationUnit TU){
330  CXCursor C = { CXCursor_CXXBaseSpecifier, { B, 0, TU } };
331  return C;
332}
333
334CXXBaseSpecifier *cxcursor::getCursorCXXBaseSpecifier(CXCursor C) {
335  assert(C.kind == CXCursor_CXXBaseSpecifier);
336  return static_cast<CXXBaseSpecifier*>(C.data[0]);
337}
338
339CXCursor cxcursor::MakePreprocessingDirectiveCursor(SourceRange Range,
340                                                    CXTranslationUnit TU) {
341  CXCursor C = { CXCursor_PreprocessingDirective,
342                 { reinterpret_cast<void *>(Range.getBegin().getRawEncoding()),
343                   reinterpret_cast<void *>(Range.getEnd().getRawEncoding()),
344                   TU }
345               };
346  return C;
347}
348
349SourceRange cxcursor::getCursorPreprocessingDirective(CXCursor C) {
350  assert(C.kind == CXCursor_PreprocessingDirective);
351  return SourceRange(SourceLocation::getFromRawEncoding(
352                                      reinterpret_cast<uintptr_t> (C.data[0])),
353                     SourceLocation::getFromRawEncoding(
354                                      reinterpret_cast<uintptr_t> (C.data[1])));
355}
356
357CXCursor cxcursor::MakeMacroDefinitionCursor(MacroDefinition *MI,
358                                             CXTranslationUnit TU) {
359  CXCursor C = { CXCursor_MacroDefinition, { MI, 0, TU } };
360  return C;
361}
362
363MacroDefinition *cxcursor::getCursorMacroDefinition(CXCursor C) {
364  assert(C.kind == CXCursor_MacroDefinition);
365  return static_cast<MacroDefinition *>(C.data[0]);
366}
367
368CXCursor cxcursor::MakeMacroInstantiationCursor(MacroInstantiation *MI,
369                                                CXTranslationUnit TU) {
370  CXCursor C = { CXCursor_MacroInstantiation, { MI, 0, TU } };
371  return C;
372}
373
374MacroInstantiation *cxcursor::getCursorMacroInstantiation(CXCursor C) {
375  assert(C.kind == CXCursor_MacroInstantiation);
376  return static_cast<MacroInstantiation *>(C.data[0]);
377}
378
379CXCursor cxcursor::MakeInclusionDirectiveCursor(InclusionDirective *ID,
380                                                CXTranslationUnit TU) {
381  CXCursor C = { CXCursor_InclusionDirective, { ID, 0, TU } };
382  return C;
383}
384
385InclusionDirective *cxcursor::getCursorInclusionDirective(CXCursor C) {
386  assert(C.kind == CXCursor_InclusionDirective);
387  return static_cast<InclusionDirective *>(C.data[0]);
388}
389
390CXCursor cxcursor::MakeCursorLabelRef(LabelStmt *Label, SourceLocation Loc,
391                                      CXTranslationUnit TU) {
392
393  assert(Label && TU && "Invalid arguments!");
394  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
395  CXCursor C = { CXCursor_LabelRef, { Label, RawLoc, TU } };
396  return C;
397}
398
399std::pair<LabelStmt*, SourceLocation>
400cxcursor::getCursorLabelRef(CXCursor C) {
401  assert(C.kind == CXCursor_LabelRef);
402  return std::make_pair(static_cast<LabelStmt *>(C.data[0]),
403                        SourceLocation::getFromRawEncoding(
404                                       reinterpret_cast<uintptr_t>(C.data[1])));
405}
406
407CXCursor cxcursor::MakeCursorOverloadedDeclRef(OverloadExpr *E,
408                                               CXTranslationUnit TU) {
409  assert(E && TU && "Invalid arguments!");
410  OverloadedDeclRefStorage Storage(E);
411  void *RawLoc = reinterpret_cast<void *>(E->getNameLoc().getRawEncoding());
412  CXCursor C = {
413                 CXCursor_OverloadedDeclRef,
414                 { Storage.getOpaqueValue(), RawLoc, TU }
415               };
416  return C;
417}
418
419CXCursor cxcursor::MakeCursorOverloadedDeclRef(Decl *D,
420                                               SourceLocation Loc,
421                                               CXTranslationUnit TU) {
422  assert(D && TU && "Invalid arguments!");
423  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
424  OverloadedDeclRefStorage Storage(D);
425  CXCursor C = {
426    CXCursor_OverloadedDeclRef,
427    { Storage.getOpaqueValue(), RawLoc, TU }
428  };
429  return C;
430}
431
432CXCursor cxcursor::MakeCursorOverloadedDeclRef(TemplateName Name,
433                                               SourceLocation Loc,
434                                               CXTranslationUnit TU) {
435  assert(Name.getAsOverloadedTemplate() && TU && "Invalid arguments!");
436  void *RawLoc = reinterpret_cast<void *>(Loc.getRawEncoding());
437  OverloadedDeclRefStorage Storage(Name.getAsOverloadedTemplate());
438  CXCursor C = {
439    CXCursor_OverloadedDeclRef,
440    { Storage.getOpaqueValue(), RawLoc, TU }
441  };
442  return C;
443}
444
445std::pair<cxcursor::OverloadedDeclRefStorage, SourceLocation>
446cxcursor::getCursorOverloadedDeclRef(CXCursor C) {
447  assert(C.kind == CXCursor_OverloadedDeclRef);
448  return std::make_pair(OverloadedDeclRefStorage::getFromOpaqueValue(C.data[0]),
449                        SourceLocation::getFromRawEncoding(
450                                       reinterpret_cast<uintptr_t>(C.data[1])));
451}
452
453Decl *cxcursor::getCursorDecl(CXCursor Cursor) {
454  return (Decl *)Cursor.data[0];
455}
456
457Expr *cxcursor::getCursorExpr(CXCursor Cursor) {
458  return dyn_cast_or_null<Expr>(getCursorStmt(Cursor));
459}
460
461Stmt *cxcursor::getCursorStmt(CXCursor Cursor) {
462  if (Cursor.kind == CXCursor_ObjCSuperClassRef ||
463      Cursor.kind == CXCursor_ObjCProtocolRef ||
464      Cursor.kind == CXCursor_ObjCClassRef)
465    return 0;
466
467  return (Stmt *)Cursor.data[1];
468}
469
470Attr *cxcursor::getCursorAttr(CXCursor Cursor) {
471  return (Attr *)Cursor.data[1];
472}
473
474ASTContext &cxcursor::getCursorContext(CXCursor Cursor) {
475  return getCursorASTUnit(Cursor)->getASTContext();
476}
477
478ASTUnit *cxcursor::getCursorASTUnit(CXCursor Cursor) {
479  return static_cast<ASTUnit *>(static_cast<CXTranslationUnit>(Cursor.data[2])
480                                  ->TUData);
481}
482
483CXTranslationUnit cxcursor::getCursorTU(CXCursor Cursor) {
484  return static_cast<CXTranslationUnit>(Cursor.data[2]);
485}
486
487bool cxcursor::operator==(CXCursor X, CXCursor Y) {
488  return X.kind == Y.kind && X.data[0] == Y.data[0] && X.data[1] == Y.data[1] &&
489         X.data[2] == Y.data[2];
490}
491
492// FIXME: Remove once we can model DeclGroups and their appropriate ranges
493// properly in the ASTs.
494bool cxcursor::isFirstInDeclGroup(CXCursor C) {
495  assert(clang_isDeclaration(C.kind));
496  return ((uintptr_t) (C.data[1])) != 0;
497}
498
499//===----------------------------------------------------------------------===//
500// CXCursorSet.
501//===----------------------------------------------------------------------===//
502
503typedef llvm::DenseMap<CXCursor, unsigned> CXCursorSet_Impl;
504
505static inline CXCursorSet packCXCursorSet(CXCursorSet_Impl *setImpl) {
506  return (CXCursorSet) setImpl;
507}
508static inline CXCursorSet_Impl *unpackCXCursorSet(CXCursorSet set) {
509  return (CXCursorSet_Impl*) set;
510}
511namespace llvm {
512template<> struct DenseMapInfo<CXCursor> {
513public:
514  static inline CXCursor getEmptyKey() {
515    return MakeCXCursorInvalid(CXCursor_InvalidFile);
516  }
517  static inline CXCursor getTombstoneKey() {
518    return MakeCXCursorInvalid(CXCursor_NoDeclFound);
519  }
520  static inline unsigned getHashValue(const CXCursor &cursor) {
521    return llvm::DenseMapInfo<std::pair<void*,void*> >
522      ::getHashValue(std::make_pair(cursor.data[0], cursor.data[1]));
523  }
524  static inline bool isEqual(const CXCursor &x, const CXCursor &y) {
525    return x.kind == y.kind &&
526           x.data[0] == y.data[0] &&
527           x.data[1] == y.data[1];
528  }
529};
530}
531
532extern "C" {
533CXCursorSet clang_createCXCursorSet() {
534  return packCXCursorSet(new CXCursorSet_Impl());
535}
536
537void clang_disposeCXCursorSet(CXCursorSet set) {
538  delete unpackCXCursorSet(set);
539}
540
541unsigned clang_CXCursorSet_contains(CXCursorSet set, CXCursor cursor) {
542  CXCursorSet_Impl *setImpl = unpackCXCursorSet(set);
543  if (!setImpl)
544    return 0;
545  return setImpl->find(cursor) == setImpl->end();
546}
547
548unsigned clang_CXCursorSet_insert(CXCursorSet set, CXCursor cursor) {
549  // Do not insert invalid cursors into the set.
550  if (cursor.kind >= CXCursor_FirstInvalid &&
551      cursor.kind <= CXCursor_LastInvalid)
552    return 1;
553
554  CXCursorSet_Impl *setImpl = unpackCXCursorSet(set);
555  if (!setImpl)
556    return 1;
557  unsigned &entry = (*setImpl)[cursor];
558  unsigned flag = entry == 0 ? 1 : 0;
559  entry = 1;
560  return flag;
561}
562} // end: extern "C"
563