contrib/llvm/tools/clang/lib/Index/IndexSymbol.cpp

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