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<std::unique_ptr<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,
44                        std::unique_ptr<MatcherDescriptor> Callback);
45 
46   ConstructorMap Constructors;
47 };
48 
49 void RegistryMaps::registerMatcher(
50     StringRef MatcherName, std::unique_ptr<MatcherDescriptor> Callback) {
51   assert(Constructors.find(MatcherName) == Constructors.end());
52   Constructors[MatcherName] = std::move(Callback);
53 }
54 
55 #define REGISTER_MATCHER(name)                                                 \
56   registerMatcher(#name, internal::makeMatcherAutoMarshall(                    \
57                              ::clang::ast_matchers::name, #name));
58 
59 #define SPECIFIC_MATCHER_OVERLOAD(name, Id)                                    \
60   static_cast<::clang::ast_matchers::name##_Type##Id>(                         \
61       ::clang::ast_matchers::name)
62 
63 #define REGISTER_OVERLOADED_2(name)                                            \
64   do {                                                                         \
65     std::unique_ptr<MatcherDescriptor> Callbacks[] = {                         \
66         internal::makeMatcherAutoMarshall(SPECIFIC_MATCHER_OVERLOAD(name, 0),  \
67                                           #name),                              \
68         internal::makeMatcherAutoMarshall(SPECIFIC_MATCHER_OVERLOAD(name, 1),  \
69                                           #name)};                             \
70     registerMatcher(                                                           \
71         #name,                                                                 \
72         llvm::make_unique<internal::OverloadedMatcherDescriptor>(Callbacks));  \
73   } while (0)
74 
75 /// \brief Generate a registry map with all the known matchers.
76 RegistryMaps::RegistryMaps() {
77   // TODO: Here is the list of the missing matchers, grouped by reason.
78   //
79   // Need Variant/Parser fixes:
80   // ofKind
81   //
82   // Polymorphic + argument overload:
83   // findAll
84   //
85   // Other:
86   // equals
87   // equalsNode
88 
89   REGISTER_OVERLOADED_2(callee);
90   REGISTER_OVERLOADED_2(hasPrefix);
91   REGISTER_OVERLOADED_2(hasType);
92   REGISTER_OVERLOADED_2(isDerivedFrom);
93   REGISTER_OVERLOADED_2(isSameOrDerivedFrom);
94   REGISTER_OVERLOADED_2(loc);
95   REGISTER_OVERLOADED_2(pointsTo);
96   REGISTER_OVERLOADED_2(references);
97   REGISTER_OVERLOADED_2(thisPointerType);
98 
99   REGISTER_MATCHER(accessSpecDecl);
100   REGISTER_MATCHER(addrLabelExpr);
101   REGISTER_MATCHER(alignOfExpr);
102   REGISTER_MATCHER(allOf);
103   REGISTER_MATCHER(anyOf);
104   REGISTER_MATCHER(anything);
105   REGISTER_MATCHER(argumentCountIs);
106   REGISTER_MATCHER(arraySubscriptExpr);
107   REGISTER_MATCHER(arrayType);
108   REGISTER_MATCHER(asmStmt);
109   REGISTER_MATCHER(asString);
110   REGISTER_MATCHER(atomicExpr);
111   REGISTER_MATCHER(atomicType);
112   REGISTER_MATCHER(autoType);
113   REGISTER_MATCHER(binaryOperator);
114   REGISTER_MATCHER(binaryConditionalOperator);
115   REGISTER_MATCHER(blockPointerType);
116   REGISTER_MATCHER(booleanType);
117   REGISTER_MATCHER(breakStmt);
118   REGISTER_MATCHER(builtinType);
119   REGISTER_MATCHER(callExpr);
120   REGISTER_MATCHER(caseStmt);
121   REGISTER_MATCHER(castExpr);
122   REGISTER_MATCHER(characterLiteral);
123   REGISTER_MATCHER(classTemplateDecl);
124   REGISTER_MATCHER(classTemplateSpecializationDecl);
125   REGISTER_MATCHER(complexType);
126   REGISTER_MATCHER(compoundLiteralExpr);
127   REGISTER_MATCHER(compoundStmt);
128   REGISTER_MATCHER(conditionalOperator);
129   REGISTER_MATCHER(constantArrayType);
130   REGISTER_MATCHER(containsDeclaration);
131   REGISTER_MATCHER(continueStmt);
132   REGISTER_MATCHER(cStyleCastExpr);
133   REGISTER_MATCHER(cudaKernelCallExpr);
134   REGISTER_MATCHER(cxxBindTemporaryExpr);
135   REGISTER_MATCHER(cxxBoolLiteral);
136   REGISTER_MATCHER(cxxCatchStmt);
137   REGISTER_MATCHER(cxxConstCastExpr);
138   REGISTER_MATCHER(cxxConstructExpr);
139   REGISTER_MATCHER(cxxConstructorDecl);
140   REGISTER_MATCHER(cxxConversionDecl);
141   REGISTER_MATCHER(cxxCtorInitializer);
142   REGISTER_MATCHER(cxxDefaultArgExpr);
143   REGISTER_MATCHER(cxxDeleteExpr);
144   REGISTER_MATCHER(cxxDestructorDecl);
145   REGISTER_MATCHER(cxxDynamicCastExpr);
146   REGISTER_MATCHER(cxxForRangeStmt);
147   REGISTER_MATCHER(cxxFunctionalCastExpr);
148   REGISTER_MATCHER(cxxMemberCallExpr);
149   REGISTER_MATCHER(cxxMethodDecl);
150   REGISTER_MATCHER(cxxNewExpr);
151   REGISTER_MATCHER(cxxNullPtrLiteralExpr);
152   REGISTER_MATCHER(cxxOperatorCallExpr);
153   REGISTER_MATCHER(cxxRecordDecl);
154   REGISTER_MATCHER(cxxReinterpretCastExpr);
155   REGISTER_MATCHER(cxxStaticCastExpr);
156   REGISTER_MATCHER(cxxTemporaryObjectExpr);
157   REGISTER_MATCHER(cxxThisExpr);
158   REGISTER_MATCHER(cxxThrowExpr);
159   REGISTER_MATCHER(cxxTryStmt);
160   REGISTER_MATCHER(cxxUnresolvedConstructExpr);
161   REGISTER_MATCHER(decayedType);
162   REGISTER_MATCHER(decl);
163   REGISTER_MATCHER(declaratorDecl);
164   REGISTER_MATCHER(declCountIs);
165   REGISTER_MATCHER(declRefExpr);
166   REGISTER_MATCHER(declStmt);
167   REGISTER_MATCHER(defaultStmt);
168   REGISTER_MATCHER(dependentSizedArrayType);
169   REGISTER_MATCHER(designatedInitExpr);
170   REGISTER_MATCHER(designatorCountIs);
171   REGISTER_MATCHER(doStmt);
172   REGISTER_MATCHER(eachOf);
173   REGISTER_MATCHER(elaboratedType);
174   REGISTER_MATCHER(enumConstantDecl);
175   REGISTER_MATCHER(enumDecl);
176   REGISTER_MATCHER(enumType);
177   REGISTER_MATCHER(equalsBoundNode);
178   REGISTER_MATCHER(equalsIntegralValue);
179   REGISTER_MATCHER(explicitCastExpr);
180   REGISTER_MATCHER(expr);
181   REGISTER_MATCHER(exprWithCleanups);
182   REGISTER_MATCHER(fieldDecl);
183   REGISTER_MATCHER(floatLiteral);
184   REGISTER_MATCHER(forEach);
185   REGISTER_MATCHER(forEachArgumentWithParam);
186   REGISTER_MATCHER(forEachConstructorInitializer);
187   REGISTER_MATCHER(forEachDescendant);
188   REGISTER_MATCHER(forEachSwitchCase);
189   REGISTER_MATCHER(forField);
190   REGISTER_MATCHER(forFunction);
191   REGISTER_MATCHER(forStmt);
192   REGISTER_MATCHER(friendDecl);
193   REGISTER_MATCHER(functionDecl);
194   REGISTER_MATCHER(functionProtoType);
195   REGISTER_MATCHER(functionTemplateDecl);
196   REGISTER_MATCHER(functionType);
197   REGISTER_MATCHER(gnuNullExpr);
198   REGISTER_MATCHER(gotoStmt);
199   REGISTER_MATCHER(has);
200   REGISTER_MATCHER(hasAncestor);
201   REGISTER_MATCHER(hasAnyArgument);
202   REGISTER_MATCHER(hasAnyConstructorInitializer);
203   REGISTER_MATCHER(hasAnyDeclaration);
204   REGISTER_MATCHER(hasAnyName);
205   REGISTER_MATCHER(hasAnyParameter);
206   REGISTER_MATCHER(hasAnySubstatement);
207   REGISTER_MATCHER(hasAnyTemplateArgument);
208   REGISTER_MATCHER(hasAnyUsingShadowDecl);
209   REGISTER_MATCHER(hasArgument);
210   REGISTER_MATCHER(hasArgumentOfType);
211   REGISTER_MATCHER(hasAttr);
212   REGISTER_MATCHER(hasAutomaticStorageDuration);
213   REGISTER_MATCHER(hasBase);
214   REGISTER_MATCHER(hasBitWidth);
215   REGISTER_MATCHER(hasBody);
216   REGISTER_MATCHER(hasCanonicalType);
217   REGISTER_MATCHER(hasCaseConstant);
218   REGISTER_MATCHER(hasCastKind);
219   REGISTER_MATCHER(hasCondition);
220   REGISTER_MATCHER(hasConditionVariableStatement);
221   REGISTER_MATCHER(hasDecayedType);
222   REGISTER_MATCHER(hasDeclaration);
223   REGISTER_MATCHER(hasDeclContext);
224   REGISTER_MATCHER(hasDeducedType);
225   REGISTER_MATCHER(hasDescendant);
226   REGISTER_MATCHER(hasDestinationType);
227   REGISTER_MATCHER(hasDynamicExceptionSpec);
228   REGISTER_MATCHER(hasEitherOperand);
229   REGISTER_MATCHER(hasElementType);
230   REGISTER_MATCHER(hasElse);
231   REGISTER_MATCHER(hasExternalFormalLinkage);
232   REGISTER_MATCHER(hasFalseExpression);
233   REGISTER_MATCHER(hasGlobalStorage);
234   REGISTER_MATCHER(hasImplicitDestinationType);
235   REGISTER_MATCHER(hasIncrement);
236   REGISTER_MATCHER(hasIndex);
237   REGISTER_MATCHER(hasInitializer);
238   REGISTER_MATCHER(hasKeywordSelector);
239   REGISTER_MATCHER(hasLHS);
240   REGISTER_MATCHER(hasLocalQualifiers);
241   REGISTER_MATCHER(hasLocalStorage);
242   REGISTER_MATCHER(hasLoopInit);
243   REGISTER_MATCHER(hasLoopVariable);
244   REGISTER_MATCHER(hasMethod);
245   REGISTER_MATCHER(hasName);
246   REGISTER_MATCHER(hasNullSelector);
247   REGISTER_MATCHER(hasObjectExpression);
248   REGISTER_MATCHER(hasOperatorName);
249   REGISTER_MATCHER(hasOverloadedOperatorName);
250   REGISTER_MATCHER(hasParameter);
251   REGISTER_MATCHER(hasParent);
252   REGISTER_MATCHER(hasQualifier);
253   REGISTER_MATCHER(hasRangeInit);
254   REGISTER_MATCHER(hasReceiverType);
255   REGISTER_MATCHER(hasReturnValue);
256   REGISTER_MATCHER(hasRHS);
257   REGISTER_MATCHER(hasSelector);
258   REGISTER_MATCHER(hasSingleDecl);
259   REGISTER_MATCHER(hasSize);
260   REGISTER_MATCHER(hasSizeExpr);
261   REGISTER_MATCHER(hasSourceExpression);
262   REGISTER_MATCHER(hasStaticStorageDuration);
263   REGISTER_MATCHER(hasSyntacticForm);
264   REGISTER_MATCHER(hasTargetDecl);
265   REGISTER_MATCHER(hasTemplateArgument);
266   REGISTER_MATCHER(hasThen);
267   REGISTER_MATCHER(hasThreadStorageDuration);
268   REGISTER_MATCHER(hasTrueExpression);
269   REGISTER_MATCHER(hasTypeLoc);
270   REGISTER_MATCHER(hasUnaryOperand);
271   REGISTER_MATCHER(hasUnarySelector);
272   REGISTER_MATCHER(hasUnderlyingDecl);
273   REGISTER_MATCHER(hasValueType);
274   REGISTER_MATCHER(ifStmt);
275   REGISTER_MATCHER(ignoringImplicit);
276   REGISTER_MATCHER(ignoringImpCasts);
277   REGISTER_MATCHER(ignoringParenCasts);
278   REGISTER_MATCHER(ignoringParenImpCasts);
279   REGISTER_MATCHER(ignoringParens);
280   REGISTER_MATCHER(implicitCastExpr);
281   REGISTER_MATCHER(implicitValueInitExpr);
282   REGISTER_MATCHER(incompleteArrayType);
283   REGISTER_MATCHER(initListExpr);
284   REGISTER_MATCHER(injectedClassNameType);
285   REGISTER_MATCHER(innerType);
286   REGISTER_MATCHER(integerLiteral);
287   REGISTER_MATCHER(isAnonymous);
288   REGISTER_MATCHER(isAnyCharacter);
289   REGISTER_MATCHER(isAnyPointer);
290   REGISTER_MATCHER(isArrow);
291   REGISTER_MATCHER(isBaseInitializer);
292   REGISTER_MATCHER(isBitField);
293   REGISTER_MATCHER(isCatchAll);
294   REGISTER_MATCHER(isClass);
295   REGISTER_MATCHER(isConst);
296   REGISTER_MATCHER(isConstQualified);
297   REGISTER_MATCHER(isCopyAssignmentOperator);
298   REGISTER_MATCHER(isCopyConstructor);
299   REGISTER_MATCHER(isDefaultConstructor);
300   REGISTER_MATCHER(isDefaulted);
301   REGISTER_MATCHER(isDefinition);
302   REGISTER_MATCHER(isDeleted);
303   REGISTER_MATCHER(isExceptionVariable);
304   REGISTER_MATCHER(isExplicit);
305   REGISTER_MATCHER(isExplicitTemplateSpecialization);
306   REGISTER_MATCHER(isExpr);
307   REGISTER_MATCHER(isExternC);
308   REGISTER_MATCHER(isFinal);
309   REGISTER_MATCHER(isInline);
310   REGISTER_MATCHER(isImplicit);
311   REGISTER_MATCHER(isExpansionInFileMatching);
312   REGISTER_MATCHER(isExpansionInMainFile);
313   REGISTER_MATCHER(isInstantiated);
314   REGISTER_MATCHER(isExpansionInSystemHeader);
315   REGISTER_MATCHER(isInteger);
316   REGISTER_MATCHER(isIntegral);
317   REGISTER_MATCHER(isInTemplateInstantiation);
318   REGISTER_MATCHER(isLambda);
319   REGISTER_MATCHER(isListInitialization);
320   REGISTER_MATCHER(isMemberInitializer);
321   REGISTER_MATCHER(isMoveAssignmentOperator);
322   REGISTER_MATCHER(isMoveConstructor);
323   REGISTER_MATCHER(isNoThrow);
324   REGISTER_MATCHER(isOverride);
325   REGISTER_MATCHER(isPrivate);
326   REGISTER_MATCHER(isProtected);
327   REGISTER_MATCHER(isPublic);
328   REGISTER_MATCHER(isPure);
329   REGISTER_MATCHER(isSignedInteger);
330   REGISTER_MATCHER(isStruct);
331   REGISTER_MATCHER(isTemplateInstantiation);
332   REGISTER_MATCHER(isUnion);
333   REGISTER_MATCHER(isUnsignedInteger);
334   REGISTER_MATCHER(isVariadic);
335   REGISTER_MATCHER(isVirtual);
336   REGISTER_MATCHER(isVirtualAsWritten);
337   REGISTER_MATCHER(isVolatileQualified);
338   REGISTER_MATCHER(isWritten);
339   REGISTER_MATCHER(labelDecl);
340   REGISTER_MATCHER(labelStmt);
341   REGISTER_MATCHER(lambdaExpr);
342   REGISTER_MATCHER(lValueReferenceType);
343   REGISTER_MATCHER(matchesName);
344   REGISTER_MATCHER(matchesSelector);
345   REGISTER_MATCHER(materializeTemporaryExpr);
346   REGISTER_MATCHER(member);
347   REGISTER_MATCHER(memberExpr);
348   REGISTER_MATCHER(memberPointerType);
349   REGISTER_MATCHER(namedDecl);
350   REGISTER_MATCHER(namespaceAliasDecl);
351   REGISTER_MATCHER(namespaceDecl);
352   REGISTER_MATCHER(namesType);
353   REGISTER_MATCHER(nestedNameSpecifier);
354   REGISTER_MATCHER(nestedNameSpecifierLoc);
355   REGISTER_MATCHER(nullPointerConstant);
356   REGISTER_MATCHER(nullStmt);
357   REGISTER_MATCHER(numSelectorArgs);
358   REGISTER_MATCHER(ofClass);
359   REGISTER_MATCHER(objcInterfaceDecl);
360   REGISTER_MATCHER(objcMessageExpr);
361   REGISTER_MATCHER(objcObjectPointerType);
362   REGISTER_MATCHER(on);
363   REGISTER_MATCHER(onImplicitObjectArgument);
364   REGISTER_MATCHER(opaqueValueExpr);
365   REGISTER_MATCHER(parameterCountIs);
366   REGISTER_MATCHER(parenExpr);
367   REGISTER_MATCHER(parenListExpr);
368   REGISTER_MATCHER(parenType);
369   REGISTER_MATCHER(parmVarDecl);
370   REGISTER_MATCHER(pointee);
371   REGISTER_MATCHER(pointerType);
372   REGISTER_MATCHER(predefinedExpr);
373   REGISTER_MATCHER(qualType);
374   REGISTER_MATCHER(realFloatingPointType);
375   REGISTER_MATCHER(recordDecl);
376   REGISTER_MATCHER(recordType);
377   REGISTER_MATCHER(referenceType);
378   REGISTER_MATCHER(refersToDeclaration);
379   REGISTER_MATCHER(refersToIntegralType);
380   REGISTER_MATCHER(refersToType);
381   REGISTER_MATCHER(requiresZeroInitialization);
382   REGISTER_MATCHER(returns);
383   REGISTER_MATCHER(returnStmt);
384   REGISTER_MATCHER(rValueReferenceType);
385   REGISTER_MATCHER(sizeOfExpr);
386   REGISTER_MATCHER(specifiesNamespace);
387   REGISTER_MATCHER(specifiesType);
388   REGISTER_MATCHER(specifiesTypeLoc);
389   REGISTER_MATCHER(statementCountIs);
390   REGISTER_MATCHER(staticAssertDecl);
391   REGISTER_MATCHER(stmt);
392   REGISTER_MATCHER(stmtExpr);
393   REGISTER_MATCHER(stringLiteral);
394   REGISTER_MATCHER(substNonTypeTemplateParmExpr);
395   REGISTER_MATCHER(substTemplateTypeParmType);
396   REGISTER_MATCHER(switchCase);
397   REGISTER_MATCHER(switchStmt);
398   REGISTER_MATCHER(templateArgument);
399   REGISTER_MATCHER(templateName);
400   REGISTER_MATCHER(templateArgumentCountIs);
401   REGISTER_MATCHER(templateSpecializationType);
402   REGISTER_MATCHER(templateTypeParmDecl);
403   REGISTER_MATCHER(templateTypeParmType);
404   REGISTER_MATCHER(throughUsingDecl);
405   REGISTER_MATCHER(to);
406   REGISTER_MATCHER(translationUnitDecl);
407   REGISTER_MATCHER(type);
408   REGISTER_MATCHER(typedefDecl);
409   REGISTER_MATCHER(typedefNameDecl);
410   REGISTER_MATCHER(typedefType);
411   REGISTER_MATCHER(typeAliasDecl);
412   REGISTER_MATCHER(typeLoc);
413   REGISTER_MATCHER(unaryExprOrTypeTraitExpr);
414   REGISTER_MATCHER(unaryOperator);
415   REGISTER_MATCHER(unaryTransformType);
416   REGISTER_MATCHER(unless);
417   REGISTER_MATCHER(unresolvedLookupExpr);
418   REGISTER_MATCHER(unresolvedUsingTypenameDecl);
419   REGISTER_MATCHER(unresolvedUsingValueDecl);
420   REGISTER_MATCHER(userDefinedLiteral);
421   REGISTER_MATCHER(usingDecl);
422   REGISTER_MATCHER(usingDirectiveDecl);
423   REGISTER_MATCHER(valueDecl);
424   REGISTER_MATCHER(varDecl);
425   REGISTER_MATCHER(variableArrayType);
426   REGISTER_MATCHER(voidType);
427   REGISTER_MATCHER(whileStmt);
428   REGISTER_MATCHER(withInitializer);
429 }
430 
431 RegistryMaps::~RegistryMaps() {}
432 
433 static llvm::ManagedStatic<RegistryMaps> RegistryData;
434 
435 } // anonymous namespace
436 
437 // static
438 llvm::Optional<MatcherCtor> Registry::lookupMatcherCtor(StringRef MatcherName) {
439   auto it = RegistryData->constructors().find(MatcherName);
440   return it == RegistryData->constructors().end()
441              ? llvm::Optional<MatcherCtor>()
442              : it->second.get();
443 }
444 
445 namespace {
446 
447 llvm::raw_ostream &operator<<(llvm::raw_ostream &OS,
448                               const std::set<ASTNodeKind> &KS) {
449   unsigned Count = 0;
450   for (std::set<ASTNodeKind>::const_iterator I = KS.begin(), E = KS.end();
451        I != E; ++I) {
452     if (I != KS.begin())
453       OS << "|";
454     if (Count++ == 3) {
455       OS << "...";
456       break;
457     }
458     OS << *I;
459   }
460   return OS;
461 }
462 
463 }  // namespace
464 
465 std::vector<ArgKind> Registry::getAcceptedCompletionTypes(
466     ArrayRef<std::pair<MatcherCtor, unsigned>> Context) {
467   ASTNodeKind InitialTypes[] = {
468       ASTNodeKind::getFromNodeKind<Decl>(),
469       ASTNodeKind::getFromNodeKind<QualType>(),
470       ASTNodeKind::getFromNodeKind<Type>(),
471       ASTNodeKind::getFromNodeKind<Stmt>(),
472       ASTNodeKind::getFromNodeKind<NestedNameSpecifier>(),
473       ASTNodeKind::getFromNodeKind<NestedNameSpecifierLoc>(),
474       ASTNodeKind::getFromNodeKind<TypeLoc>()};
475 
476   // Starting with the above seed of acceptable top-level matcher types, compute
477   // the acceptable type set for the argument indicated by each context element.
478   std::set<ArgKind> TypeSet(std::begin(InitialTypes), std::end(InitialTypes));
479   for (const auto &CtxEntry : Context) {
480     MatcherCtor Ctor = CtxEntry.first;
481     unsigned ArgNumber = CtxEntry.second;
482     std::vector<ArgKind> NextTypeSet;
483     for (const ArgKind &Kind : TypeSet) {
484       if (Kind.getArgKind() == Kind.AK_Matcher &&
485           Ctor->isConvertibleTo(Kind.getMatcherKind()) &&
486           (Ctor->isVariadic() || ArgNumber < Ctor->getNumArgs()))
487         Ctor->getArgKinds(Kind.getMatcherKind(), ArgNumber, NextTypeSet);
488     }
489     TypeSet.clear();
490     TypeSet.insert(NextTypeSet.begin(), NextTypeSet.end());
491   }
492   return std::vector<ArgKind>(TypeSet.begin(), TypeSet.end());
493 }
494 
495 std::vector<MatcherCompletion>
496 Registry::getMatcherCompletions(ArrayRef<ArgKind> AcceptedTypes) {
497   std::vector<MatcherCompletion> Completions;
498 
499   // Search the registry for acceptable matchers.
500   for (const auto &M : RegistryData->constructors()) {
501     const MatcherDescriptor& Matcher = *M.getValue();
502     StringRef Name = M.getKey();
503 
504     std::set<ASTNodeKind> RetKinds;
505     unsigned NumArgs = Matcher.isVariadic() ? 1 : Matcher.getNumArgs();
506     bool IsPolymorphic = Matcher.isPolymorphic();
507     std::vector<std::vector<ArgKind>> ArgsKinds(NumArgs);
508     unsigned MaxSpecificity = 0;
509     for (const ArgKind& Kind : AcceptedTypes) {
510       if (Kind.getArgKind() != Kind.AK_Matcher)
511         continue;
512       unsigned Specificity;
513       ASTNodeKind LeastDerivedKind;
514       if (Matcher.isConvertibleTo(Kind.getMatcherKind(), &Specificity,
515                                   &LeastDerivedKind)) {
516         if (MaxSpecificity < Specificity)
517           MaxSpecificity = Specificity;
518         RetKinds.insert(LeastDerivedKind);
519         for (unsigned Arg = 0; Arg != NumArgs; ++Arg)
520           Matcher.getArgKinds(Kind.getMatcherKind(), Arg, ArgsKinds[Arg]);
521         if (IsPolymorphic)
522           break;
523       }
524     }
525 
526     if (!RetKinds.empty() && MaxSpecificity > 0) {
527       std::string Decl;
528       llvm::raw_string_ostream OS(Decl);
529 
530       if (IsPolymorphic) {
531         OS << "Matcher<T> " << Name << "(Matcher<T>";
532       } else {
533         OS << "Matcher<" << RetKinds << "> " << Name << "(";
534         for (const std::vector<ArgKind> &Arg : ArgsKinds) {
535           if (&Arg != &ArgsKinds[0])
536             OS << ", ";
537 
538           bool FirstArgKind = true;
539           std::set<ASTNodeKind> MatcherKinds;
540           // Two steps. First all non-matchers, then matchers only.
541           for (const ArgKind &AK : Arg) {
542             if (AK.getArgKind() == ArgKind::AK_Matcher) {
543               MatcherKinds.insert(AK.getMatcherKind());
544             } else {
545               if (!FirstArgKind) OS << "|";
546               FirstArgKind = false;
547               OS << AK.asString();
548             }
549           }
550           if (!MatcherKinds.empty()) {
551             if (!FirstArgKind) OS << "|";
552             OS << "Matcher<" << MatcherKinds << ">";
553           }
554         }
555       }
556       if (Matcher.isVariadic())
557         OS << "...";
558       OS << ")";
559 
560       std::string TypedText = Name;
561       TypedText += "(";
562       if (ArgsKinds.empty())
563         TypedText += ")";
564       else if (ArgsKinds[0][0].getArgKind() == ArgKind::AK_String)
565         TypedText += "\"";
566 
567       Completions.emplace_back(TypedText, OS.str(), MaxSpecificity);
568     }
569   }
570 
571   return Completions;
572 }
573 
574 // static
575 VariantMatcher Registry::constructMatcher(MatcherCtor Ctor,
576                                           SourceRange NameRange,
577                                           ArrayRef<ParserValue> Args,
578                                           Diagnostics *Error) {
579   return Ctor->create(NameRange, Args, Error);
580 }
581 
582 // static
583 VariantMatcher Registry::constructBoundMatcher(MatcherCtor Ctor,
584                                                SourceRange NameRange,
585                                                StringRef BindID,
586                                                ArrayRef<ParserValue> Args,
587                                                Diagnostics *Error) {
588   VariantMatcher Out = constructMatcher(Ctor, NameRange, Args, Error);
589   if (Out.isNull()) return Out;
590 
591   llvm::Optional<DynTypedMatcher> Result = Out.getSingleMatcher();
592   if (Result.hasValue()) {
593     llvm::Optional<DynTypedMatcher> Bound = Result->tryBind(BindID);
594     if (Bound.hasValue()) {
595       return VariantMatcher::SingleMatcher(*Bound);
596     }
597   }
598   Error->addError(NameRange, Error->ET_RegistryNotBindable);
599   return VariantMatcher();
600 }
601 
602 }  // namespace dynamic
603 }  // namespace ast_matchers
604 }  // namespace clang
605