1 //===--- IndexSymbol.cpp - Types and functions for indexing symbols -------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "clang/Index/IndexSymbol.h"
10 #include "clang/AST/Attr.h"
11 #include "clang/AST/DeclCXX.h"
12 #include "clang/AST/DeclObjC.h"
13 #include "clang/AST/DeclTemplate.h"
14 #include "clang/AST/PrettyPrinter.h"
15 #include "clang/Lex/MacroInfo.h"
16 
17 using namespace clang;
18 using namespace clang::index;
19 
20 /// \returns true if \c D is a subclass of 'XCTestCase'.
21 static bool isUnitTestCase(const ObjCInterfaceDecl *D) {
22   if (!D)
23     return false;
24   while (const ObjCInterfaceDecl *SuperD = D->getSuperClass()) {
25     if (SuperD->getName() == "XCTestCase")
26       return true;
27     D = SuperD;
28   }
29   return false;
30 }
31 
32 /// \returns true if \c D is in a subclass of 'XCTestCase', returns void, has
33 /// no parameters, and its name starts with 'test'.
34 static bool isUnitTest(const ObjCMethodDecl *D) {
35   if (!D->parameters().empty())
36     return false;
37   if (!D->getReturnType()->isVoidType())
38     return false;
39   if (!D->getSelector().getNameForSlot(0).startswith("test"))
40     return false;
41   return isUnitTestCase(D->getClassInterface());
42 }
43 
44 static void checkForIBOutlets(const Decl *D, SymbolPropertySet &PropSet) {
45   if (D->hasAttr<IBOutletAttr>()) {
46     PropSet |= (SymbolPropertySet)SymbolProperty::IBAnnotated;
47   } else if (D->hasAttr<IBOutletCollectionAttr>()) {
48     PropSet |= (SymbolPropertySet)SymbolProperty::IBAnnotated;
49     PropSet |= (SymbolPropertySet)SymbolProperty::IBOutletCollection;
50   }
51 }
52 
53 bool index::isFunctionLocalSymbol(const Decl *D) {
54   assert(D);
55 
56   if (isa<ParmVarDecl>(D))
57     return true;
58 
59   if (isa<ObjCTypeParamDecl>(D))
60     return true;
61 
62   if (isa<UsingDirectiveDecl>(D))
63     return false;
64   if (!D->getParentFunctionOrMethod())
65     return false;
66 
67   if (const NamedDecl *ND = dyn_cast<NamedDecl>(D)) {
68     switch (ND->getFormalLinkage()) {
69       case NoLinkage:
70       case InternalLinkage:
71         return true;
72       case VisibleNoLinkage:
73       case UniqueExternalLinkage:
74         llvm_unreachable("Not a sema linkage");
75       case ModuleLinkage:
76       case ExternalLinkage:
77         return false;
78     }
79   }
80 
81   return true;
82 }
83 
84 SymbolInfo index::getSymbolInfo(const Decl *D) {
85   assert(D);
86   SymbolInfo Info;
87   Info.Kind = SymbolKind::Unknown;
88   Info.SubKind = SymbolSubKind::None;
89   Info.Properties = SymbolPropertySet();
90   Info.Lang = SymbolLanguage::C;
91 
92   if (isFunctionLocalSymbol(D)) {
93     Info.Properties |= (SymbolPropertySet)SymbolProperty::Local;
94   }
95   if (isa<ObjCProtocolDecl>(D->getDeclContext())) {
96     Info.Properties |= (SymbolPropertySet)SymbolProperty::ProtocolInterface;
97   }
98 
99   if (auto *VT = dyn_cast<VarTemplateDecl>(D)) {
100     Info.Properties |= (SymbolPropertySet)SymbolProperty::Generic;
101     Info.Lang = SymbolLanguage::CXX;
102     // All other fields are filled from the templated decl.
103     D = VT->getTemplatedDecl();
104   }
105 
106   if (const TagDecl *TD = dyn_cast<TagDecl>(D)) {
107     switch (TD->getTagKind()) {
108     case TTK_Struct:
109       Info.Kind = SymbolKind::Struct; break;
110     case TTK_Union:
111       Info.Kind = SymbolKind::Union; break;
112     case TTK_Class:
113       Info.Kind = SymbolKind::Class;
114       Info.Lang = SymbolLanguage::CXX;
115       break;
116     case TTK_Interface:
117       Info.Kind = SymbolKind::Protocol;
118       Info.Lang = SymbolLanguage::CXX;
119       break;
120     case TTK_Enum:
121       Info.Kind = SymbolKind::Enum; break;
122     }
123 
124     if (const CXXRecordDecl *CXXRec = dyn_cast<CXXRecordDecl>(D)) {
125       if (!CXXRec->isCLike()) {
126         Info.Lang = SymbolLanguage::CXX;
127         if (CXXRec->getDescribedClassTemplate()) {
128           Info.Properties |= (SymbolPropertySet)SymbolProperty::Generic;
129         }
130       }
131     }
132 
133     if (isa<ClassTemplatePartialSpecializationDecl>(D)) {
134       Info.Properties |= (SymbolPropertySet)SymbolProperty::Generic;
135       Info.Properties |=
136           (SymbolPropertySet)SymbolProperty::TemplatePartialSpecialization;
137     } else if (isa<ClassTemplateSpecializationDecl>(D)) {
138       Info.Properties |= (SymbolPropertySet)SymbolProperty::Generic;
139       Info.Properties |=
140           (SymbolPropertySet)SymbolProperty::TemplateSpecialization;
141     }
142 
143   } else if (auto *VD = dyn_cast<VarDecl>(D)) {
144     Info.Kind = SymbolKind::Variable;
145     if (isa<ParmVarDecl>(D)) {
146       Info.Kind = SymbolKind::Parameter;
147     } else if (isa<CXXRecordDecl>(D->getDeclContext())) {
148       Info.Kind = SymbolKind::StaticProperty;
149       Info.Lang = SymbolLanguage::CXX;
150     }
151 
152     if (isa<VarTemplatePartialSpecializationDecl>(D)) {
153       Info.Lang = SymbolLanguage::CXX;
154       Info.Properties |= (SymbolPropertySet)SymbolProperty::Generic;
155       Info.Properties |=
156           (SymbolPropertySet)SymbolProperty::TemplatePartialSpecialization;
157     } else if (isa<VarTemplateSpecializationDecl>(D)) {
158       Info.Lang = SymbolLanguage::CXX;
159       Info.Properties |= (SymbolPropertySet)SymbolProperty::Generic;
160       Info.Properties |=
161           (SymbolPropertySet)SymbolProperty::TemplateSpecialization;
162     } else if (VD->getDescribedVarTemplate()) {
163       Info.Lang = SymbolLanguage::CXX;
164       Info.Properties |= (SymbolPropertySet)SymbolProperty::Generic;
165     }
166 
167   } else {
168     switch (D->getKind()) {
169     case Decl::Import:
170       Info.Kind = SymbolKind::Module;
171       break;
172     case Decl::Typedef:
173       Info.Kind = SymbolKind::TypeAlias; break; // Lang = C
174     case Decl::Function:
175       Info.Kind = SymbolKind::Function;
176       break;
177     case Decl::Field:
178     case Decl::IndirectField:
179       Info.Kind = SymbolKind::Field;
180       if (const CXXRecordDecl *
181             CXXRec = dyn_cast<CXXRecordDecl>(D->getDeclContext())) {
182         if (!CXXRec->isCLike())
183           Info.Lang = SymbolLanguage::CXX;
184       }
185       break;
186     case Decl::EnumConstant:
187       Info.Kind = SymbolKind::EnumConstant; break;
188     case Decl::ObjCInterface:
189     case Decl::ObjCImplementation: {
190       Info.Kind = SymbolKind::Class;
191       Info.Lang = SymbolLanguage::ObjC;
192       const ObjCInterfaceDecl *ClsD = dyn_cast<ObjCInterfaceDecl>(D);
193       if (!ClsD)
194         ClsD = cast<ObjCImplementationDecl>(D)->getClassInterface();
195       if (isUnitTestCase(ClsD))
196         Info.Properties |= (SymbolPropertySet)SymbolProperty::UnitTest;
197       break;
198     }
199     case Decl::ObjCProtocol:
200       Info.Kind = SymbolKind::Protocol;
201       Info.Lang = SymbolLanguage::ObjC;
202       break;
203     case Decl::ObjCCategory:
204     case Decl::ObjCCategoryImpl: {
205       Info.Kind = SymbolKind::Extension;
206       Info.Lang = SymbolLanguage::ObjC;
207       const ObjCInterfaceDecl *ClsD = nullptr;
208       if (auto *CatD = dyn_cast<ObjCCategoryDecl>(D))
209         ClsD = CatD->getClassInterface();
210       else
211         ClsD = cast<ObjCCategoryImplDecl>(D)->getClassInterface();
212       if (isUnitTestCase(ClsD))
213         Info.Properties |= (SymbolPropertySet)SymbolProperty::UnitTest;
214       break;
215     }
216     case Decl::ObjCMethod: {
217       const ObjCMethodDecl *MD = cast<ObjCMethodDecl>(D);
218       Info.Kind = MD->isInstanceMethod() ? SymbolKind::InstanceMethod : SymbolKind::ClassMethod;
219       if (MD->isPropertyAccessor()) {
220         if (MD->param_size())
221           Info.SubKind = SymbolSubKind::AccessorSetter;
222         else
223           Info.SubKind = SymbolSubKind::AccessorGetter;
224       }
225       Info.Lang = SymbolLanguage::ObjC;
226       if (isUnitTest(MD))
227         Info.Properties |= (SymbolPropertySet)SymbolProperty::UnitTest;
228       if (D->hasAttr<IBActionAttr>())
229         Info.Properties |= (SymbolPropertySet)SymbolProperty::IBAnnotated;
230       break;
231     }
232     case Decl::ObjCProperty:
233       Info.Kind = SymbolKind::InstanceProperty;
234       Info.Lang = SymbolLanguage::ObjC;
235       checkForIBOutlets(D, Info.Properties);
236       if (auto *Annot = D->getAttr<AnnotateAttr>()) {
237         if (Annot->getAnnotation() == "gk_inspectable")
238           Info.Properties |= (SymbolPropertySet)SymbolProperty::GKInspectable;
239       }
240       break;
241     case Decl::ObjCIvar:
242       Info.Kind = SymbolKind::Field;
243       Info.Lang = SymbolLanguage::ObjC;
244       checkForIBOutlets(D, Info.Properties);
245       break;
246     case Decl::Namespace:
247       Info.Kind = SymbolKind::Namespace;
248       Info.Lang = SymbolLanguage::CXX;
249       break;
250     case Decl::NamespaceAlias:
251       Info.Kind = SymbolKind::NamespaceAlias;
252       Info.Lang = SymbolLanguage::CXX;
253       break;
254     case Decl::CXXConstructor: {
255       Info.Kind = SymbolKind::Constructor;
256       Info.Lang = SymbolLanguage::CXX;
257       auto *CD = cast<CXXConstructorDecl>(D);
258       if (CD->isCopyConstructor())
259         Info.SubKind = SymbolSubKind::CXXCopyConstructor;
260       else if (CD->isMoveConstructor())
261         Info.SubKind = SymbolSubKind::CXXMoveConstructor;
262       break;
263     }
264     case Decl::CXXDestructor:
265       Info.Kind = SymbolKind::Destructor;
266       Info.Lang = SymbolLanguage::CXX;
267       break;
268     case Decl::CXXConversion:
269       Info.Kind = SymbolKind::ConversionFunction;
270       Info.Lang = SymbolLanguage::CXX;
271       break;
272     case Decl::CXXMethod: {
273       const CXXMethodDecl *MD = cast<CXXMethodDecl>(D);
274       if (MD->isStatic())
275         Info.Kind = SymbolKind::StaticMethod;
276       else
277         Info.Kind = SymbolKind::InstanceMethod;
278       Info.Lang = SymbolLanguage::CXX;
279       break;
280     }
281     case Decl::ClassTemplate:
282       Info.Kind = SymbolKind::Class;
283       Info.Properties |= (SymbolPropertySet)SymbolProperty::Generic;
284       Info.Lang = SymbolLanguage::CXX;
285       break;
286     case Decl::FunctionTemplate:
287       Info.Kind = SymbolKind::Function;
288       Info.Properties |= (SymbolPropertySet)SymbolProperty::Generic;
289       Info.Lang = SymbolLanguage::CXX;
290       if (const CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(
291                            cast<FunctionTemplateDecl>(D)->getTemplatedDecl())) {
292         if (isa<CXXConstructorDecl>(MD))
293           Info.Kind = SymbolKind::Constructor;
294         else if (isa<CXXDestructorDecl>(MD))
295           Info.Kind = SymbolKind::Destructor;
296         else if (isa<CXXConversionDecl>(MD))
297           Info.Kind = SymbolKind::ConversionFunction;
298         else {
299           if (MD->isStatic())
300             Info.Kind = SymbolKind::StaticMethod;
301           else
302             Info.Kind = SymbolKind::InstanceMethod;
303         }
304       }
305       break;
306     case Decl::TypeAliasTemplate:
307       Info.Kind = SymbolKind::TypeAlias;
308       Info.Lang = SymbolLanguage::CXX;
309       Info.Properties |= (SymbolPropertySet)SymbolProperty::Generic;
310       break;
311     case Decl::TypeAlias:
312       Info.Kind = SymbolKind::TypeAlias;
313       Info.Lang = SymbolLanguage::CXX;
314       break;
315     case Decl::UnresolvedUsingTypename:
316       Info.Kind = SymbolKind::Using;
317       Info.SubKind = SymbolSubKind::UsingTypename;
318       Info.Lang = SymbolLanguage::CXX;
319       Info.Properties |= (SymbolPropertySet)SymbolProperty::Generic;
320       break;
321     case Decl::UnresolvedUsingValue:
322       Info.Kind = SymbolKind::Using;
323       Info.SubKind = SymbolSubKind::UsingValue;
324       Info.Lang = SymbolLanguage::CXX;
325       Info.Properties |= (SymbolPropertySet)SymbolProperty::Generic;
326       break;
327     case Decl::Using:
328       Info.Kind = SymbolKind::Using;
329       Info.Lang = SymbolLanguage::CXX;
330       break;
331     case Decl::UsingEnum:
332       Info.Kind = SymbolKind::Using;
333       Info.Lang = SymbolLanguage::CXX;
334       Info.SubKind = SymbolSubKind::UsingEnum;
335       break;
336     case Decl::Binding:
337       Info.Kind = SymbolKind::Variable;
338       Info.Lang = SymbolLanguage::CXX;
339       break;
340     case Decl::MSProperty:
341       Info.Kind = SymbolKind::InstanceProperty;
342       if (const CXXRecordDecl *CXXRec =
343               dyn_cast<CXXRecordDecl>(D->getDeclContext())) {
344         if (!CXXRec->isCLike())
345           Info.Lang = SymbolLanguage::CXX;
346       }
347       break;
348     case Decl::ClassTemplatePartialSpecialization:
349     case Decl::ClassScopeFunctionSpecialization:
350     case Decl::ClassTemplateSpecialization:
351     case Decl::CXXRecord:
352     case Decl::Enum:
353     case Decl::Record:
354       llvm_unreachable("records handled before");
355       break;
356     case Decl::VarTemplateSpecialization:
357     case Decl::VarTemplatePartialSpecialization:
358     case Decl::ImplicitParam:
359     case Decl::ParmVar:
360     case Decl::Var:
361     case Decl::VarTemplate:
362       llvm_unreachable("variables handled before");
363       break;
364     case Decl::TemplateTypeParm:
365       Info.Kind = SymbolKind::TemplateTypeParm;
366       break;
367     case Decl::TemplateTemplateParm:
368       Info.Kind = SymbolKind::TemplateTemplateParm;
369       break;
370     case Decl::NonTypeTemplateParm:
371       Info.Kind = SymbolKind::NonTypeTemplateParm;
372       break;
373     case Decl::Concept:
374       Info.Kind = SymbolKind::Concept;
375       break;
376     // Other decls get the 'unknown' kind.
377     default:
378       break;
379     }
380   }
381 
382   if (Info.Kind == SymbolKind::Unknown)
383     return Info;
384 
385   if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
386     if (FD->getTemplatedKind() ==
387           FunctionDecl::TK_FunctionTemplateSpecialization) {
388       Info.Properties |= (SymbolPropertySet)SymbolProperty::Generic;
389       Info.Properties |=
390           (SymbolPropertySet)SymbolProperty::TemplateSpecialization;
391     }
392   }
393 
394   if (Info.Properties & (SymbolPropertySet)SymbolProperty::Generic)
395     Info.Lang = SymbolLanguage::CXX;
396 
397   if (auto *attr = D->getExternalSourceSymbolAttr()) {
398     if (attr->getLanguage() == "Swift")
399       Info.Lang = SymbolLanguage::Swift;
400   }
401 
402   return Info;
403 }
404 
405 SymbolInfo index::getSymbolInfoForMacro(const MacroInfo &) {
406   SymbolInfo Info;
407   Info.Kind = SymbolKind::Macro;
408   Info.SubKind = SymbolSubKind::None;
409   Info.Properties = SymbolPropertySet();
410   Info.Lang = SymbolLanguage::C;
411   return Info;
412 }
413 
414 bool index::applyForEachSymbolRoleInterruptible(SymbolRoleSet Roles,
415                                    llvm::function_ref<bool(SymbolRole)> Fn) {
416 #define APPLY_FOR_ROLE(Role) \
417   if (Roles & (unsigned)SymbolRole::Role) \
418     if (!Fn(SymbolRole::Role)) \
419       return false;
420 
421   APPLY_FOR_ROLE(Declaration);
422   APPLY_FOR_ROLE(Definition);
423   APPLY_FOR_ROLE(Reference);
424   APPLY_FOR_ROLE(Read);
425   APPLY_FOR_ROLE(Write);
426   APPLY_FOR_ROLE(Call);
427   APPLY_FOR_ROLE(Dynamic);
428   APPLY_FOR_ROLE(AddressOf);
429   APPLY_FOR_ROLE(Implicit);
430   APPLY_FOR_ROLE(Undefinition);
431   APPLY_FOR_ROLE(RelationChildOf);
432   APPLY_FOR_ROLE(RelationBaseOf);
433   APPLY_FOR_ROLE(RelationOverrideOf);
434   APPLY_FOR_ROLE(RelationReceivedBy);
435   APPLY_FOR_ROLE(RelationCalledBy);
436   APPLY_FOR_ROLE(RelationExtendedBy);
437   APPLY_FOR_ROLE(RelationAccessorOf);
438   APPLY_FOR_ROLE(RelationContainedBy);
439   APPLY_FOR_ROLE(RelationIBTypeOf);
440   APPLY_FOR_ROLE(RelationSpecializationOf);
441   APPLY_FOR_ROLE(NameReference);
442 
443 #undef APPLY_FOR_ROLE
444 
445   return true;
446 }
447 
448 void index::applyForEachSymbolRole(SymbolRoleSet Roles,
449                                    llvm::function_ref<void(SymbolRole)> Fn) {
450   applyForEachSymbolRoleInterruptible(Roles, [&](SymbolRole r) -> bool {
451     Fn(r);
452     return true;
453   });
454 }
455 
456 void index::printSymbolRoles(SymbolRoleSet Roles, raw_ostream &OS) {
457   bool VisitedOnce = false;
458   applyForEachSymbolRole(Roles, [&](SymbolRole Role) {
459     if (VisitedOnce)
460       OS << ',';
461     else
462       VisitedOnce = true;
463     switch (Role) {
464     case SymbolRole::Declaration: OS << "Decl"; break;
465     case SymbolRole::Definition: OS << "Def"; break;
466     case SymbolRole::Reference: OS << "Ref"; break;
467     case SymbolRole::Read: OS << "Read"; break;
468     case SymbolRole::Write: OS << "Writ"; break;
469     case SymbolRole::Call: OS << "Call"; break;
470     case SymbolRole::Dynamic: OS << "Dyn"; break;
471     case SymbolRole::AddressOf: OS << "Addr"; break;
472     case SymbolRole::Implicit: OS << "Impl"; break;
473     case SymbolRole::Undefinition: OS << "Undef"; break;
474     case SymbolRole::RelationChildOf: OS << "RelChild"; break;
475     case SymbolRole::RelationBaseOf: OS << "RelBase"; break;
476     case SymbolRole::RelationOverrideOf: OS << "RelOver"; break;
477     case SymbolRole::RelationReceivedBy: OS << "RelRec"; break;
478     case SymbolRole::RelationCalledBy: OS << "RelCall"; break;
479     case SymbolRole::RelationExtendedBy: OS << "RelExt"; break;
480     case SymbolRole::RelationAccessorOf: OS << "RelAcc"; break;
481     case SymbolRole::RelationContainedBy: OS << "RelCont"; break;
482     case SymbolRole::RelationIBTypeOf: OS << "RelIBType"; break;
483     case SymbolRole::RelationSpecializationOf: OS << "RelSpecialization"; break;
484     case SymbolRole::NameReference: OS << "NameReference"; break;
485     }
486   });
487 }
488 
489 bool index::printSymbolName(const Decl *D, const LangOptions &LO,
490                             raw_ostream &OS) {
491   if (auto *ND = dyn_cast<NamedDecl>(D)) {
492     PrintingPolicy Policy(LO);
493     // Forward references can have different template argument names. Suppress
494     // the template argument names in constructors to make their name more
495     // stable.
496     Policy.SuppressTemplateArgsInCXXConstructors = true;
497     DeclarationName DeclName = ND->getDeclName();
498     if (DeclName.isEmpty())
499       return true;
500     DeclName.print(OS, Policy);
501     return false;
502   } else {
503     return true;
504   }
505 }
506 
507 StringRef index::getSymbolKindString(SymbolKind K) {
508   switch (K) {
509   case SymbolKind::Unknown: return "<unknown>";
510   case SymbolKind::Module: return "module";
511   case SymbolKind::Namespace: return "namespace";
512   case SymbolKind::NamespaceAlias: return "namespace-alias";
513   case SymbolKind::Macro: return "macro";
514   case SymbolKind::Enum: return "enum";
515   case SymbolKind::Struct: return "struct";
516   case SymbolKind::Class: return "class";
517   case SymbolKind::Protocol: return "protocol";
518   case SymbolKind::Extension: return "extension";
519   case SymbolKind::Union: return "union";
520   case SymbolKind::TypeAlias: return "type-alias";
521   case SymbolKind::Function: return "function";
522   case SymbolKind::Variable: return "variable";
523   case SymbolKind::Field: return "field";
524   case SymbolKind::EnumConstant: return "enumerator";
525   case SymbolKind::InstanceMethod: return "instance-method";
526   case SymbolKind::ClassMethod: return "class-method";
527   case SymbolKind::StaticMethod: return "static-method";
528   case SymbolKind::InstanceProperty: return "instance-property";
529   case SymbolKind::ClassProperty: return "class-property";
530   case SymbolKind::StaticProperty: return "static-property";
531   case SymbolKind::Constructor: return "constructor";
532   case SymbolKind::Destructor: return "destructor";
533   case SymbolKind::ConversionFunction: return "conversion-func";
534   case SymbolKind::Parameter: return "param";
535   case SymbolKind::Using: return "using";
536   case SymbolKind::TemplateTypeParm: return "template-type-param";
537   case SymbolKind::TemplateTemplateParm: return "template-template-param";
538   case SymbolKind::NonTypeTemplateParm: return "non-type-template-param";
539   case SymbolKind::Concept:
540     return "concept";
541   }
542   llvm_unreachable("invalid symbol kind");
543 }
544 
545 StringRef index::getSymbolSubKindString(SymbolSubKind K) {
546   switch (K) {
547   case SymbolSubKind::None: return "<none>";
548   case SymbolSubKind::CXXCopyConstructor: return "cxx-copy-ctor";
549   case SymbolSubKind::CXXMoveConstructor: return "cxx-move-ctor";
550   case SymbolSubKind::AccessorGetter: return "acc-get";
551   case SymbolSubKind::AccessorSetter: return "acc-set";
552   case SymbolSubKind::UsingTypename: return "using-typename";
553   case SymbolSubKind::UsingValue: return "using-value";
554   case SymbolSubKind::UsingEnum:
555     return "using-enum";
556   }
557   llvm_unreachable("invalid symbol subkind");
558 }
559 
560 StringRef index::getSymbolLanguageString(SymbolLanguage K) {
561   switch (K) {
562   case SymbolLanguage::C: return "C";
563   case SymbolLanguage::ObjC: return "ObjC";
564   case SymbolLanguage::CXX: return "C++";
565   case SymbolLanguage::Swift: return "Swift";
566   }
567   llvm_unreachable("invalid symbol language kind");
568 }
569 
570 void index::applyForEachSymbolProperty(SymbolPropertySet Props,
571                                   llvm::function_ref<void(SymbolProperty)> Fn) {
572 #define APPLY_FOR_PROPERTY(K)                                                  \
573   if (Props & (SymbolPropertySet)SymbolProperty::K)                            \
574   Fn(SymbolProperty::K)
575 
576   APPLY_FOR_PROPERTY(Generic);
577   APPLY_FOR_PROPERTY(TemplatePartialSpecialization);
578   APPLY_FOR_PROPERTY(TemplateSpecialization);
579   APPLY_FOR_PROPERTY(UnitTest);
580   APPLY_FOR_PROPERTY(IBAnnotated);
581   APPLY_FOR_PROPERTY(IBOutletCollection);
582   APPLY_FOR_PROPERTY(GKInspectable);
583   APPLY_FOR_PROPERTY(Local);
584   APPLY_FOR_PROPERTY(ProtocolInterface);
585 
586 #undef APPLY_FOR_PROPERTY
587 }
588 
589 void index::printSymbolProperties(SymbolPropertySet Props, raw_ostream &OS) {
590   bool VisitedOnce = false;
591   applyForEachSymbolProperty(Props, [&](SymbolProperty Prop) {
592     if (VisitedOnce)
593       OS << ',';
594     else
595       VisitedOnce = true;
596     switch (Prop) {
597     case SymbolProperty::Generic: OS << "Gen"; break;
598     case SymbolProperty::TemplatePartialSpecialization: OS << "TPS"; break;
599     case SymbolProperty::TemplateSpecialization: OS << "TS"; break;
600     case SymbolProperty::UnitTest: OS << "test"; break;
601     case SymbolProperty::IBAnnotated: OS << "IB"; break;
602     case SymbolProperty::IBOutletCollection: OS << "IBColl"; break;
603     case SymbolProperty::GKInspectable: OS << "GKI"; break;
604     case SymbolProperty::Local: OS << "local"; break;
605     case SymbolProperty::ProtocolInterface: OS << "protocol"; break;
606     }
607   });
608 }
609