1 //===--- Registry.cpp - Matcher registry -------------------------===//
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 /// \file
11 /// \brief Registry map populated at static initialization time.
12 ///
13 //===------------------------------------------------------------===//
14 
15 #include "clang/ASTMatchers/Dynamic/Registry.h"
16 #include "Marshallers.h"
17 #include "clang/ASTMatchers/ASTMatchers.h"
18 #include "llvm/ADT/STLExtras.h"
19 #include "llvm/ADT/StringMap.h"
20 #include "llvm/ADT/StringRef.h"
21 #include "llvm/Support/ManagedStatic.h"
22 #include <set>
23 #include <utility>
24 
25 using namespace clang::ast_type_traits;
26 
27 namespace clang {
28 namespace ast_matchers {
29 namespace dynamic {
30 namespace {
31 
32 using internal::MatcherDescriptor;
33 
34 typedef llvm::StringMap<const MatcherDescriptor *> ConstructorMap;
35 class RegistryMaps {
36 public:
37   RegistryMaps();
38   ~RegistryMaps();
39 
40   const ConstructorMap &constructors() const { return Constructors; }
41 
42 private:
43   void registerMatcher(StringRef MatcherName, MatcherDescriptor *Callback);
44   ConstructorMap Constructors;
45 };
46 
47 void RegistryMaps::registerMatcher(StringRef MatcherName,
48                                    MatcherDescriptor *Callback) {
49   assert(Constructors.find(MatcherName) == Constructors.end());
50   Constructors[MatcherName] = Callback;
51 }
52 
53 #define REGISTER_MATCHER(name)                                                 \
54   registerMatcher(#name, internal::makeMatcherAutoMarshall(                    \
55                              ::clang::ast_matchers::name, #name));
56 
57 #define SPECIFIC_MATCHER_OVERLOAD(name, Id)                                    \
58   static_cast< ::clang::ast_matchers::name##_Type##Id>(                        \
59       ::clang::ast_matchers::name)
60 
61 #define REGISTER_OVERLOADED_2(name)                                            \
62   do {                                                                         \
63     MatcherDescriptor *Callbacks[] = {                                         \
64       internal::makeMatcherAutoMarshall(SPECIFIC_MATCHER_OVERLOAD(name, 0),    \
65                                         #name),                                \
66       internal::makeMatcherAutoMarshall(SPECIFIC_MATCHER_OVERLOAD(name, 1),    \
67                                         #name)                                 \
68     };                                                                         \
69     registerMatcher(#name,                                                     \
70                     new internal::OverloadedMatcherDescriptor(Callbacks));     \
71   } while (0)
72 
73 /// \brief Generate a registry map with all the known matchers.
74 RegistryMaps::RegistryMaps() {
75   // TODO: Here is the list of the missing matchers, grouped by reason.
76   //
77   // Need Variant/Parser fixes:
78   // ofKind
79   //
80   // Polymorphic + argument overload:
81   // findAll
82   //
83   // Other:
84   // equals
85   // equalsNode
86 
87   REGISTER_OVERLOADED_2(callee);
88   REGISTER_OVERLOADED_2(hasPrefix);
89   REGISTER_OVERLOADED_2(hasType);
90   REGISTER_OVERLOADED_2(isDerivedFrom);
91   REGISTER_OVERLOADED_2(isSameOrDerivedFrom);
92   REGISTER_OVERLOADED_2(loc);
93   REGISTER_OVERLOADED_2(pointsTo);
94   REGISTER_OVERLOADED_2(references);
95   REGISTER_OVERLOADED_2(thisPointerType);
96 
97   REGISTER_MATCHER(accessSpecDecl);
98   REGISTER_MATCHER(addrLabelExpr);
99   REGISTER_MATCHER(alignOfExpr);
100   REGISTER_MATCHER(allOf);
101   REGISTER_MATCHER(anyOf);
102   REGISTER_MATCHER(anything);
103   REGISTER_MATCHER(argumentCountIs);
104   REGISTER_MATCHER(arraySubscriptExpr);
105   REGISTER_MATCHER(arrayType);
106   REGISTER_MATCHER(asmStmt);
107   REGISTER_MATCHER(asString);
108   REGISTER_MATCHER(atomicExpr);
109   REGISTER_MATCHER(atomicType);
110   REGISTER_MATCHER(autoType);
111   REGISTER_MATCHER(binaryOperator);
112   REGISTER_MATCHER(binaryConditionalOperator);
113   REGISTER_MATCHER(blockPointerType);
114   REGISTER_MATCHER(booleanType);
115   REGISTER_MATCHER(breakStmt);
116   REGISTER_MATCHER(builtinType);
117   REGISTER_MATCHER(callExpr);
118   REGISTER_MATCHER(caseStmt);
119   REGISTER_MATCHER(castExpr);
120   REGISTER_MATCHER(characterLiteral);
121   REGISTER_MATCHER(classTemplateDecl);
122   REGISTER_MATCHER(classTemplateSpecializationDecl);
123   REGISTER_MATCHER(complexType);
124   REGISTER_MATCHER(compoundLiteralExpr);
125   REGISTER_MATCHER(compoundStmt);
126   REGISTER_MATCHER(conditionalOperator);
127   REGISTER_MATCHER(constantArrayType);
128   REGISTER_MATCHER(containsDeclaration);
129   REGISTER_MATCHER(continueStmt);
130   REGISTER_MATCHER(cStyleCastExpr);
131   REGISTER_MATCHER(cudaKernelCallExpr);
132   REGISTER_MATCHER(cxxBindTemporaryExpr);
133   REGISTER_MATCHER(cxxBoolLiteral);
134   REGISTER_MATCHER(cxxCatchStmt);
135   REGISTER_MATCHER(cxxConstCastExpr);
136   REGISTER_MATCHER(cxxConstructExpr);
137   REGISTER_MATCHER(cxxConstructorDecl);
138   REGISTER_MATCHER(cxxConversionDecl);
139   REGISTER_MATCHER(cxxCtorInitializer);
140   REGISTER_MATCHER(cxxDefaultArgExpr);
141   REGISTER_MATCHER(cxxDeleteExpr);
142   REGISTER_MATCHER(cxxDestructorDecl);
143   REGISTER_MATCHER(cxxDynamicCastExpr);
144   REGISTER_MATCHER(cxxForRangeStmt);
145   REGISTER_MATCHER(cxxFunctionalCastExpr);
146   REGISTER_MATCHER(cxxMemberCallExpr);
147   REGISTER_MATCHER(cxxMethodDecl);
148   REGISTER_MATCHER(cxxNewExpr);
149   REGISTER_MATCHER(cxxNullPtrLiteralExpr);
150   REGISTER_MATCHER(cxxOperatorCallExpr);
151   REGISTER_MATCHER(cxxRecordDecl);
152   REGISTER_MATCHER(cxxReinterpretCastExpr);
153   REGISTER_MATCHER(cxxStaticCastExpr);
154   REGISTER_MATCHER(cxxTemporaryObjectExpr);
155   REGISTER_MATCHER(cxxThisExpr);
156   REGISTER_MATCHER(cxxThrowExpr);
157   REGISTER_MATCHER(cxxTryStmt);
158   REGISTER_MATCHER(cxxUnresolvedConstructExpr);
159   REGISTER_MATCHER(decayedType);
160   REGISTER_MATCHER(decl);
161   REGISTER_MATCHER(declaratorDecl);
162   REGISTER_MATCHER(declCountIs);
163   REGISTER_MATCHER(declRefExpr);
164   REGISTER_MATCHER(declStmt);
165   REGISTER_MATCHER(defaultStmt);
166   REGISTER_MATCHER(dependentSizedArrayType);
167   REGISTER_MATCHER(designatedInitExpr);
168   REGISTER_MATCHER(designatorCountIs);
169   REGISTER_MATCHER(doStmt);
170   REGISTER_MATCHER(eachOf);
171   REGISTER_MATCHER(elaboratedType);
172   REGISTER_MATCHER(enumConstantDecl);
173   REGISTER_MATCHER(enumDecl);
174   REGISTER_MATCHER(equalsBoundNode);
175   REGISTER_MATCHER(equalsIntegralValue);
176   REGISTER_MATCHER(explicitCastExpr);
177   REGISTER_MATCHER(expr);
178   REGISTER_MATCHER(exprWithCleanups);
179   REGISTER_MATCHER(fieldDecl);
180   REGISTER_MATCHER(floatLiteral);
181   REGISTER_MATCHER(forEach);
182   REGISTER_MATCHER(forEachArgumentWithParam);
183   REGISTER_MATCHER(forEachConstructorInitializer);
184   REGISTER_MATCHER(forEachDescendant);
185   REGISTER_MATCHER(forEachSwitchCase);
186   REGISTER_MATCHER(forField);
187   REGISTER_MATCHER(forStmt);
188   REGISTER_MATCHER(friendDecl);
189   REGISTER_MATCHER(functionDecl);
190   REGISTER_MATCHER(functionProtoType);
191   REGISTER_MATCHER(functionTemplateDecl);
192   REGISTER_MATCHER(functionType);
193   REGISTER_MATCHER(gnuNullExpr);
194   REGISTER_MATCHER(gotoStmt);
195   REGISTER_MATCHER(has);
196   REGISTER_MATCHER(hasAncestor);
197   REGISTER_MATCHER(hasAnyArgument);
198   REGISTER_MATCHER(hasAnyConstructorInitializer);
199   REGISTER_MATCHER(hasAnyName);
200   REGISTER_MATCHER(hasAnyParameter);
201   REGISTER_MATCHER(hasAnySubstatement);
202   REGISTER_MATCHER(hasAnyTemplateArgument);
203   REGISTER_MATCHER(hasAnyUsingShadowDecl);
204   REGISTER_MATCHER(hasArgument);
205   REGISTER_MATCHER(hasArgumentOfType);
206   REGISTER_MATCHER(hasAttr);
207   REGISTER_MATCHER(hasAutomaticStorageDuration);
208   REGISTER_MATCHER(hasBase);
209   REGISTER_MATCHER(hasBody);
210   REGISTER_MATCHER(hasCanonicalType);
211   REGISTER_MATCHER(hasCaseConstant);
212   REGISTER_MATCHER(hasCondition);
213   REGISTER_MATCHER(hasConditionVariableStatement);
214   REGISTER_MATCHER(hasDecayedType);
215   REGISTER_MATCHER(hasDeclaration);
216   REGISTER_MATCHER(hasDeclContext);
217   REGISTER_MATCHER(hasDeducedType);
218   REGISTER_MATCHER(hasDescendant);
219   REGISTER_MATCHER(hasDestinationType);
220   REGISTER_MATCHER(hasEitherOperand);
221   REGISTER_MATCHER(hasElementType);
222   REGISTER_MATCHER(hasElse);
223   REGISTER_MATCHER(hasFalseExpression);
224   REGISTER_MATCHER(hasGlobalStorage);
225   REGISTER_MATCHER(hasImplicitDestinationType);
226   REGISTER_MATCHER(hasIncrement);
227   REGISTER_MATCHER(hasIndex);
228   REGISTER_MATCHER(hasInitializer);
229   REGISTER_MATCHER(hasKeywordSelector);
230   REGISTER_MATCHER(hasLHS);
231   REGISTER_MATCHER(hasLocalQualifiers);
232   REGISTER_MATCHER(hasLocalStorage);
233   REGISTER_MATCHER(hasLoopInit);
234   REGISTER_MATCHER(hasLoopVariable);
235   REGISTER_MATCHER(hasMethod);
236   REGISTER_MATCHER(hasName);
237   REGISTER_MATCHER(hasNullSelector);
238   REGISTER_MATCHER(hasObjectExpression);
239   REGISTER_MATCHER(hasOperatorName);
240   REGISTER_MATCHER(hasOverloadedOperatorName);
241   REGISTER_MATCHER(hasParameter);
242   REGISTER_MATCHER(hasParent);
243   REGISTER_MATCHER(hasQualifier);
244   REGISTER_MATCHER(hasRangeInit);
245   REGISTER_MATCHER(hasReceiverType);
246   REGISTER_MATCHER(hasReturnValue);
247   REGISTER_MATCHER(hasRHS);
248   REGISTER_MATCHER(hasSelector);
249   REGISTER_MATCHER(hasSingleDecl);
250   REGISTER_MATCHER(hasSize);
251   REGISTER_MATCHER(hasSizeExpr);
252   REGISTER_MATCHER(hasSourceExpression);
253   REGISTER_MATCHER(hasStaticStorageDuration);
254   REGISTER_MATCHER(hasSyntacticForm);
255   REGISTER_MATCHER(hasTargetDecl);
256   REGISTER_MATCHER(hasTemplateArgument);
257   REGISTER_MATCHER(hasThen);
258   REGISTER_MATCHER(hasThreadStorageDuration);
259   REGISTER_MATCHER(hasTrueExpression);
260   REGISTER_MATCHER(hasTypeLoc);
261   REGISTER_MATCHER(hasUnaryOperand);
262   REGISTER_MATCHER(hasUnarySelector);
263   REGISTER_MATCHER(hasValueType);
264   REGISTER_MATCHER(ifStmt);
265   REGISTER_MATCHER(ignoringImpCasts);
266   REGISTER_MATCHER(ignoringParenCasts);
267   REGISTER_MATCHER(ignoringParenImpCasts);
268   REGISTER_MATCHER(implicitCastExpr);
269   REGISTER_MATCHER(implicitValueInitExpr);
270   REGISTER_MATCHER(incompleteArrayType);
271   REGISTER_MATCHER(initListExpr);
272   REGISTER_MATCHER(injectedClassNameType);
273   REGISTER_MATCHER(innerType);
274   REGISTER_MATCHER(integerLiteral);
275   REGISTER_MATCHER(isAnonymous);
276   REGISTER_MATCHER(isAnyCharacter);
277   REGISTER_MATCHER(isAnyPointer);
278   REGISTER_MATCHER(isArrow);
279   REGISTER_MATCHER(isBaseInitializer);
280   REGISTER_MATCHER(isCatchAll);
281   REGISTER_MATCHER(isClass);
282   REGISTER_MATCHER(isConst);
283   REGISTER_MATCHER(isConstQualified);
284   REGISTER_MATCHER(isCopyAssignmentOperator);
285   REGISTER_MATCHER(isCopyConstructor);
286   REGISTER_MATCHER(isDefaultConstructor);
287   REGISTER_MATCHER(isDefaulted);
288   REGISTER_MATCHER(isDefinition);
289   REGISTER_MATCHER(isDeleted);
290   REGISTER_MATCHER(isExceptionVariable);
291   REGISTER_MATCHER(isExplicit);
292   REGISTER_MATCHER(isExplicitTemplateSpecialization);
293   REGISTER_MATCHER(isExpr);
294   REGISTER_MATCHER(isExternC);
295   REGISTER_MATCHER(isFinal);
296   REGISTER_MATCHER(isInline);
297   REGISTER_MATCHER(isImplicit);
298   REGISTER_MATCHER(isExpansionInFileMatching);
299   REGISTER_MATCHER(isExpansionInMainFile);
300   REGISTER_MATCHER(isInstantiated);
301   REGISTER_MATCHER(isExpansionInSystemHeader);
302   REGISTER_MATCHER(isInteger);
303   REGISTER_MATCHER(isIntegral);
304   REGISTER_MATCHER(isInTemplateInstantiation);
305   REGISTER_MATCHER(isListInitialization);
306   REGISTER_MATCHER(isMemberInitializer);
307   REGISTER_MATCHER(isMoveAssignmentOperator);
308   REGISTER_MATCHER(isMoveConstructor);
309   REGISTER_MATCHER(isNoThrow);
310   REGISTER_MATCHER(isOverride);
311   REGISTER_MATCHER(isPrivate);
312   REGISTER_MATCHER(isProtected);
313   REGISTER_MATCHER(isPublic);
314   REGISTER_MATCHER(isPure);
315   REGISTER_MATCHER(isStruct);
316   REGISTER_MATCHER(isTemplateInstantiation);
317   REGISTER_MATCHER(isUnion);
318   REGISTER_MATCHER(isVariadic);
319   REGISTER_MATCHER(isVirtual);
320   REGISTER_MATCHER(isVirtualAsWritten);
321   REGISTER_MATCHER(isVolatileQualified);
322   REGISTER_MATCHER(isWritten);
323   REGISTER_MATCHER(labelDecl);
324   REGISTER_MATCHER(labelStmt);
325   REGISTER_MATCHER(lambdaExpr);
326   REGISTER_MATCHER(lValueReferenceType);
327   REGISTER_MATCHER(matchesName);
328   REGISTER_MATCHER(matchesSelector);
329   REGISTER_MATCHER(materializeTemporaryExpr);
330   REGISTER_MATCHER(member);
331   REGISTER_MATCHER(memberExpr);
332   REGISTER_MATCHER(memberPointerType);
333   REGISTER_MATCHER(namedDecl);
334   REGISTER_MATCHER(namespaceAliasDecl);
335   REGISTER_MATCHER(namespaceDecl);
336   REGISTER_MATCHER(namesType);
337   REGISTER_MATCHER(nestedNameSpecifier);
338   REGISTER_MATCHER(nestedNameSpecifierLoc);
339   REGISTER_MATCHER(nullPointerConstant);
340   REGISTER_MATCHER(nullStmt);
341   REGISTER_MATCHER(numSelectorArgs);
342   REGISTER_MATCHER(ofClass);
343   REGISTER_MATCHER(objcInterfaceDecl);
344   REGISTER_MATCHER(objcMessageExpr);
345   REGISTER_MATCHER(objcObjectPointerType);
346   REGISTER_MATCHER(on);
347   REGISTER_MATCHER(onImplicitObjectArgument);
348   REGISTER_MATCHER(opaqueValueExpr);
349   REGISTER_MATCHER(parameterCountIs);
350   REGISTER_MATCHER(parenExpr);
351   REGISTER_MATCHER(parenListExpr);
352   REGISTER_MATCHER(parenType);
353   REGISTER_MATCHER(parmVarDecl);
354   REGISTER_MATCHER(pointee);
355   REGISTER_MATCHER(pointerType);
356   REGISTER_MATCHER(predefinedExpr);
357   REGISTER_MATCHER(qualType);
358   REGISTER_MATCHER(realFloatingPointType);
359   REGISTER_MATCHER(recordDecl);
360   REGISTER_MATCHER(recordType);
361   REGISTER_MATCHER(referenceType);
362   REGISTER_MATCHER(refersToDeclaration);
363   REGISTER_MATCHER(refersToIntegralType);
364   REGISTER_MATCHER(refersToType);
365   REGISTER_MATCHER(requiresZeroInitialization);
366   REGISTER_MATCHER(returns);
367   REGISTER_MATCHER(returnStmt);
368   REGISTER_MATCHER(rValueReferenceType);
369   REGISTER_MATCHER(sizeOfExpr);
370   REGISTER_MATCHER(specifiesNamespace);
371   REGISTER_MATCHER(specifiesType);
372   REGISTER_MATCHER(specifiesTypeLoc);
373   REGISTER_MATCHER(statementCountIs);
374   REGISTER_MATCHER(staticAssertDecl);
375   REGISTER_MATCHER(stmt);
376   REGISTER_MATCHER(stmtExpr);
377   REGISTER_MATCHER(stringLiteral);
378   REGISTER_MATCHER(substNonTypeTemplateParmExpr);
379   REGISTER_MATCHER(substTemplateTypeParmType);
380   REGISTER_MATCHER(switchCase);
381   REGISTER_MATCHER(switchStmt);
382   REGISTER_MATCHER(templateArgument);
383   REGISTER_MATCHER(templateArgumentCountIs);
384   REGISTER_MATCHER(templateSpecializationType);
385   REGISTER_MATCHER(templateTypeParmType);
386   REGISTER_MATCHER(throughUsingDecl);
387   REGISTER_MATCHER(to);
388   REGISTER_MATCHER(translationUnitDecl);
389   REGISTER_MATCHER(type);
390   REGISTER_MATCHER(typedefDecl);
391   REGISTER_MATCHER(typedefType);
392   REGISTER_MATCHER(typeLoc);
393   REGISTER_MATCHER(unaryExprOrTypeTraitExpr);
394   REGISTER_MATCHER(unaryOperator);
395   REGISTER_MATCHER(unaryTransformType);
396   REGISTER_MATCHER(unless);
397   REGISTER_MATCHER(unresolvedUsingTypenameDecl);
398   REGISTER_MATCHER(unresolvedUsingValueDecl);
399   REGISTER_MATCHER(userDefinedLiteral);
400   REGISTER_MATCHER(usingDecl);
401   REGISTER_MATCHER(usingDirectiveDecl);
402   REGISTER_MATCHER(valueDecl);
403   REGISTER_MATCHER(varDecl);
404   REGISTER_MATCHER(variableArrayType);
405   REGISTER_MATCHER(voidType);
406   REGISTER_MATCHER(whileStmt);
407   REGISTER_MATCHER(withInitializer);
408 }
409 
410 RegistryMaps::~RegistryMaps() {
411   llvm::DeleteContainerSeconds(Constructors);
412 }
413 
414 static llvm::ManagedStatic<RegistryMaps> RegistryData;
415 
416 } // anonymous namespace
417 
418 // static
419 llvm::Optional<MatcherCtor> Registry::lookupMatcherCtor(StringRef MatcherName) {
420   ConstructorMap::const_iterator it =
421       RegistryData->constructors().find(MatcherName);
422   return it == RegistryData->constructors().end()
423              ? llvm::Optional<MatcherCtor>()
424              : it->second;
425 }
426 
427 namespace {
428 
429 llvm::raw_ostream &operator<<(llvm::raw_ostream &OS,
430                               const std::set<ASTNodeKind> &KS) {
431   unsigned Count = 0;
432   for (std::set<ASTNodeKind>::const_iterator I = KS.begin(), E = KS.end();
433        I != E; ++I) {
434     if (I != KS.begin())
435       OS << "|";
436     if (Count++ == 3) {
437       OS << "...";
438       break;
439     }
440     OS << *I;
441   }
442   return OS;
443 }
444 
445 }  // namespace
446 
447 std::vector<ArgKind> Registry::getAcceptedCompletionTypes(
448     ArrayRef<std::pair<MatcherCtor, unsigned>> Context) {
449   ASTNodeKind InitialTypes[] = {
450       ASTNodeKind::getFromNodeKind<Decl>(),
451       ASTNodeKind::getFromNodeKind<QualType>(),
452       ASTNodeKind::getFromNodeKind<Type>(),
453       ASTNodeKind::getFromNodeKind<Stmt>(),
454       ASTNodeKind::getFromNodeKind<NestedNameSpecifier>(),
455       ASTNodeKind::getFromNodeKind<NestedNameSpecifierLoc>(),
456       ASTNodeKind::getFromNodeKind<TypeLoc>()};
457 
458   // Starting with the above seed of acceptable top-level matcher types, compute
459   // the acceptable type set for the argument indicated by each context element.
460   std::set<ArgKind> TypeSet(std::begin(InitialTypes), std::end(InitialTypes));
461   for (const auto &CtxEntry : Context) {
462     MatcherCtor Ctor = CtxEntry.first;
463     unsigned ArgNumber = CtxEntry.second;
464     std::vector<ArgKind> NextTypeSet;
465     for (const ArgKind &Kind : TypeSet) {
466       if (Kind.getArgKind() == Kind.AK_Matcher &&
467           Ctor->isConvertibleTo(Kind.getMatcherKind()) &&
468           (Ctor->isVariadic() || ArgNumber < Ctor->getNumArgs()))
469         Ctor->getArgKinds(Kind.getMatcherKind(), ArgNumber, NextTypeSet);
470     }
471     TypeSet.clear();
472     TypeSet.insert(NextTypeSet.begin(), NextTypeSet.end());
473   }
474   return std::vector<ArgKind>(TypeSet.begin(), TypeSet.end());
475 }
476 
477 std::vector<MatcherCompletion>
478 Registry::getMatcherCompletions(ArrayRef<ArgKind> AcceptedTypes) {
479   std::vector<MatcherCompletion> Completions;
480 
481   // Search the registry for acceptable matchers.
482   for (const auto &M : RegistryData->constructors()) {
483     const auto *Matcher = M.getValue();
484     StringRef Name = M.getKey();
485 
486     std::set<ASTNodeKind> RetKinds;
487     unsigned NumArgs = Matcher->isVariadic() ? 1 : Matcher->getNumArgs();
488     bool IsPolymorphic = Matcher->isPolymorphic();
489     std::vector<std::vector<ArgKind>> ArgsKinds(NumArgs);
490     unsigned MaxSpecificity = 0;
491     for (const ArgKind& Kind : AcceptedTypes) {
492       if (Kind.getArgKind() != Kind.AK_Matcher)
493         continue;
494       unsigned Specificity;
495       ASTNodeKind LeastDerivedKind;
496       if (Matcher->isConvertibleTo(Kind.getMatcherKind(), &Specificity,
497                                    &LeastDerivedKind)) {
498         if (MaxSpecificity < Specificity)
499           MaxSpecificity = Specificity;
500         RetKinds.insert(LeastDerivedKind);
501         for (unsigned Arg = 0; Arg != NumArgs; ++Arg)
502           Matcher->getArgKinds(Kind.getMatcherKind(), Arg, ArgsKinds[Arg]);
503         if (IsPolymorphic)
504           break;
505       }
506     }
507 
508     if (!RetKinds.empty() && MaxSpecificity > 0) {
509       std::string Decl;
510       llvm::raw_string_ostream OS(Decl);
511 
512       if (IsPolymorphic) {
513         OS << "Matcher<T> " << Name << "(Matcher<T>";
514       } else {
515         OS << "Matcher<" << RetKinds << "> " << Name << "(";
516         for (const std::vector<ArgKind> &Arg : ArgsKinds) {
517           if (&Arg != &ArgsKinds[0])
518             OS << ", ";
519 
520           bool FirstArgKind = true;
521           std::set<ASTNodeKind> MatcherKinds;
522           // Two steps. First all non-matchers, then matchers only.
523           for (const ArgKind &AK : Arg) {
524             if (AK.getArgKind() == ArgKind::AK_Matcher) {
525               MatcherKinds.insert(AK.getMatcherKind());
526             } else {
527               if (!FirstArgKind) OS << "|";
528               FirstArgKind = false;
529               OS << AK.asString();
530             }
531           }
532           if (!MatcherKinds.empty()) {
533             if (!FirstArgKind) OS << "|";
534             OS << "Matcher<" << MatcherKinds << ">";
535           }
536         }
537       }
538       if (Matcher->isVariadic())
539         OS << "...";
540       OS << ")";
541 
542       std::string TypedText = Name;
543       TypedText += "(";
544       if (ArgsKinds.empty())
545         TypedText += ")";
546       else if (ArgsKinds[0][0].getArgKind() == ArgKind::AK_String)
547         TypedText += "\"";
548 
549       Completions.emplace_back(TypedText, OS.str(), MaxSpecificity);
550     }
551   }
552 
553   return Completions;
554 }
555 
556 // static
557 VariantMatcher Registry::constructMatcher(MatcherCtor Ctor,
558                                           SourceRange NameRange,
559                                           ArrayRef<ParserValue> Args,
560                                           Diagnostics *Error) {
561   return Ctor->create(NameRange, Args, Error);
562 }
563 
564 // static
565 VariantMatcher Registry::constructBoundMatcher(MatcherCtor Ctor,
566                                                SourceRange NameRange,
567                                                StringRef BindID,
568                                                ArrayRef<ParserValue> Args,
569                                                Diagnostics *Error) {
570   VariantMatcher Out = constructMatcher(Ctor, NameRange, Args, Error);
571   if (Out.isNull()) return Out;
572 
573   llvm::Optional<DynTypedMatcher> Result = Out.getSingleMatcher();
574   if (Result.hasValue()) {
575     llvm::Optional<DynTypedMatcher> Bound = Result->tryBind(BindID);
576     if (Bound.hasValue()) {
577       return VariantMatcher::SingleMatcher(*Bound);
578     }
579   }
580   Error->addError(NameRange, Error->ET_RegistryNotBindable);
581   return VariantMatcher();
582 }
583 
584 }  // namespace dynamic
585 }  // namespace ast_matchers
586 }  // namespace clang
587