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(hasInClassInitializer);
236   REGISTER_MATCHER(hasIncrement);
237   REGISTER_MATCHER(hasIndex);
238   REGISTER_MATCHER(hasInitializer);
239   REGISTER_MATCHER(hasKeywordSelector);
240   REGISTER_MATCHER(hasLHS);
241   REGISTER_MATCHER(hasLocalQualifiers);
242   REGISTER_MATCHER(hasLocalStorage);
243   REGISTER_MATCHER(hasLoopInit);
244   REGISTER_MATCHER(hasLoopVariable);
245   REGISTER_MATCHER(hasMethod);
246   REGISTER_MATCHER(hasName);
247   REGISTER_MATCHER(hasNullSelector);
248   REGISTER_MATCHER(hasObjectExpression);
249   REGISTER_MATCHER(hasOperatorName);
250   REGISTER_MATCHER(hasOverloadedOperatorName);
251   REGISTER_MATCHER(hasParameter);
252   REGISTER_MATCHER(hasParent);
253   REGISTER_MATCHER(hasQualifier);
254   REGISTER_MATCHER(hasRangeInit);
255   REGISTER_MATCHER(hasReceiverType);
256   REGISTER_MATCHER(hasReplacementType);
257   REGISTER_MATCHER(hasReturnValue);
258   REGISTER_MATCHER(hasRHS);
259   REGISTER_MATCHER(hasSelector);
260   REGISTER_MATCHER(hasSingleDecl);
261   REGISTER_MATCHER(hasSize);
262   REGISTER_MATCHER(hasSizeExpr);
263   REGISTER_MATCHER(hasSourceExpression);
264   REGISTER_MATCHER(hasStaticStorageDuration);
265   REGISTER_MATCHER(hasSyntacticForm);
266   REGISTER_MATCHER(hasTargetDecl);
267   REGISTER_MATCHER(hasTemplateArgument);
268   REGISTER_MATCHER(hasThen);
269   REGISTER_MATCHER(hasThreadStorageDuration);
270   REGISTER_MATCHER(hasTrueExpression);
271   REGISTER_MATCHER(hasTypeLoc);
272   REGISTER_MATCHER(hasUnaryOperand);
273   REGISTER_MATCHER(hasUnarySelector);
274   REGISTER_MATCHER(hasUnderlyingDecl);
275   REGISTER_MATCHER(hasUnqualifiedDesugaredType);
276   REGISTER_MATCHER(hasValueType);
277   REGISTER_MATCHER(ifStmt);
278   REGISTER_MATCHER(ignoringImplicit);
279   REGISTER_MATCHER(ignoringImpCasts);
280   REGISTER_MATCHER(ignoringParenCasts);
281   REGISTER_MATCHER(ignoringParenImpCasts);
282   REGISTER_MATCHER(ignoringParens);
283   REGISTER_MATCHER(implicitCastExpr);
284   REGISTER_MATCHER(implicitValueInitExpr);
285   REGISTER_MATCHER(incompleteArrayType);
286   REGISTER_MATCHER(initListExpr);
287   REGISTER_MATCHER(injectedClassNameType);
288   REGISTER_MATCHER(innerType);
289   REGISTER_MATCHER(integerLiteral);
290   REGISTER_MATCHER(isAnonymous);
291   REGISTER_MATCHER(isAnyCharacter);
292   REGISTER_MATCHER(isAnyPointer);
293   REGISTER_MATCHER(isArrow);
294   REGISTER_MATCHER(isBaseInitializer);
295   REGISTER_MATCHER(isBitField);
296   REGISTER_MATCHER(isCatchAll);
297   REGISTER_MATCHER(isClass);
298   REGISTER_MATCHER(isConst);
299   REGISTER_MATCHER(isConstexpr);
300   REGISTER_MATCHER(isConstQualified);
301   REGISTER_MATCHER(isCopyAssignmentOperator);
302   REGISTER_MATCHER(isCopyConstructor);
303   REGISTER_MATCHER(isDefaultConstructor);
304   REGISTER_MATCHER(isDefaulted);
305   REGISTER_MATCHER(isDefinition);
306   REGISTER_MATCHER(isDeleted);
307   REGISTER_MATCHER(isExceptionVariable);
308   REGISTER_MATCHER(isExplicit);
309   REGISTER_MATCHER(isExplicitTemplateSpecialization);
310   REGISTER_MATCHER(isExpr);
311   REGISTER_MATCHER(isExternC);
312   REGISTER_MATCHER(isFinal);
313   REGISTER_MATCHER(isInline);
314   REGISTER_MATCHER(isImplicit);
315   REGISTER_MATCHER(isExpansionInFileMatching);
316   REGISTER_MATCHER(isExpansionInMainFile);
317   REGISTER_MATCHER(isInstantiated);
318   REGISTER_MATCHER(isExpansionInSystemHeader);
319   REGISTER_MATCHER(isInteger);
320   REGISTER_MATCHER(isIntegral);
321   REGISTER_MATCHER(isInTemplateInstantiation);
322   REGISTER_MATCHER(isLambda);
323   REGISTER_MATCHER(isListInitialization);
324   REGISTER_MATCHER(isMemberInitializer);
325   REGISTER_MATCHER(isMoveAssignmentOperator);
326   REGISTER_MATCHER(isMoveConstructor);
327   REGISTER_MATCHER(isNoThrow);
328   REGISTER_MATCHER(isOverride);
329   REGISTER_MATCHER(isPrivate);
330   REGISTER_MATCHER(isProtected);
331   REGISTER_MATCHER(isPublic);
332   REGISTER_MATCHER(isPure);
333   REGISTER_MATCHER(isSignedInteger);
334   REGISTER_MATCHER(isStaticStorageClass);
335   REGISTER_MATCHER(isStruct);
336   REGISTER_MATCHER(isTemplateInstantiation);
337   REGISTER_MATCHER(isUnion);
338   REGISTER_MATCHER(isUnsignedInteger);
339   REGISTER_MATCHER(isVariadic);
340   REGISTER_MATCHER(isVirtual);
341   REGISTER_MATCHER(isVirtualAsWritten);
342   REGISTER_MATCHER(isVolatileQualified);
343   REGISTER_MATCHER(isWritten);
344   REGISTER_MATCHER(labelDecl);
345   REGISTER_MATCHER(labelStmt);
346   REGISTER_MATCHER(lambdaExpr);
347   REGISTER_MATCHER(lValueReferenceType);
348   REGISTER_MATCHER(matchesName);
349   REGISTER_MATCHER(matchesSelector);
350   REGISTER_MATCHER(materializeTemporaryExpr);
351   REGISTER_MATCHER(member);
352   REGISTER_MATCHER(memberExpr);
353   REGISTER_MATCHER(memberPointerType);
354   REGISTER_MATCHER(namedDecl);
355   REGISTER_MATCHER(namespaceAliasDecl);
356   REGISTER_MATCHER(namespaceDecl);
357   REGISTER_MATCHER(namesType);
358   REGISTER_MATCHER(nestedNameSpecifier);
359   REGISTER_MATCHER(nestedNameSpecifierLoc);
360   REGISTER_MATCHER(nullPointerConstant);
361   REGISTER_MATCHER(nullStmt);
362   REGISTER_MATCHER(numSelectorArgs);
363   REGISTER_MATCHER(ofClass);
364   REGISTER_MATCHER(objcCategoryDecl);
365   REGISTER_MATCHER(objcInterfaceDecl);
366   REGISTER_MATCHER(objcIvarDecl);
367   REGISTER_MATCHER(objcMessageExpr);
368   REGISTER_MATCHER(objcMethodDecl);
369   REGISTER_MATCHER(objcObjectPointerType);
370   REGISTER_MATCHER(objcPropertyDecl);
371   REGISTER_MATCHER(objcProtocolDecl);
372   REGISTER_MATCHER(on);
373   REGISTER_MATCHER(onImplicitObjectArgument);
374   REGISTER_MATCHER(opaqueValueExpr);
375   REGISTER_MATCHER(parameterCountIs);
376   REGISTER_MATCHER(parenExpr);
377   REGISTER_MATCHER(parenListExpr);
378   REGISTER_MATCHER(parenType);
379   REGISTER_MATCHER(parmVarDecl);
380   REGISTER_MATCHER(pointee);
381   REGISTER_MATCHER(pointerType);
382   REGISTER_MATCHER(predefinedExpr);
383   REGISTER_MATCHER(qualType);
384   REGISTER_MATCHER(realFloatingPointType);
385   REGISTER_MATCHER(recordDecl);
386   REGISTER_MATCHER(recordType);
387   REGISTER_MATCHER(referenceType);
388   REGISTER_MATCHER(refersToDeclaration);
389   REGISTER_MATCHER(refersToIntegralType);
390   REGISTER_MATCHER(refersToType);
391   REGISTER_MATCHER(requiresZeroInitialization);
392   REGISTER_MATCHER(returns);
393   REGISTER_MATCHER(returnStmt);
394   REGISTER_MATCHER(rValueReferenceType);
395   REGISTER_MATCHER(sizeOfExpr);
396   REGISTER_MATCHER(specifiesNamespace);
397   REGISTER_MATCHER(specifiesType);
398   REGISTER_MATCHER(specifiesTypeLoc);
399   REGISTER_MATCHER(statementCountIs);
400   REGISTER_MATCHER(staticAssertDecl);
401   REGISTER_MATCHER(stmt);
402   REGISTER_MATCHER(stmtExpr);
403   REGISTER_MATCHER(stringLiteral);
404   REGISTER_MATCHER(substNonTypeTemplateParmExpr);
405   REGISTER_MATCHER(substTemplateTypeParmType);
406   REGISTER_MATCHER(switchCase);
407   REGISTER_MATCHER(switchStmt);
408   REGISTER_MATCHER(templateArgument);
409   REGISTER_MATCHER(templateName);
410   REGISTER_MATCHER(templateArgumentCountIs);
411   REGISTER_MATCHER(templateSpecializationType);
412   REGISTER_MATCHER(templateTypeParmDecl);
413   REGISTER_MATCHER(templateTypeParmType);
414   REGISTER_MATCHER(throughUsingDecl);
415   REGISTER_MATCHER(to);
416   REGISTER_MATCHER(translationUnitDecl);
417   REGISTER_MATCHER(type);
418   REGISTER_MATCHER(typedefDecl);
419   REGISTER_MATCHER(typedefNameDecl);
420   REGISTER_MATCHER(typedefType);
421   REGISTER_MATCHER(typeAliasDecl);
422   REGISTER_MATCHER(typeAliasTemplateDecl);
423   REGISTER_MATCHER(typeLoc);
424   REGISTER_MATCHER(unaryExprOrTypeTraitExpr);
425   REGISTER_MATCHER(unaryOperator);
426   REGISTER_MATCHER(unaryTransformType);
427   REGISTER_MATCHER(unless);
428   REGISTER_MATCHER(unresolvedLookupExpr);
429   REGISTER_MATCHER(unresolvedUsingTypenameDecl);
430   REGISTER_MATCHER(unresolvedUsingValueDecl);
431   REGISTER_MATCHER(userDefinedLiteral);
432   REGISTER_MATCHER(usingDecl);
433   REGISTER_MATCHER(usingDirectiveDecl);
434   REGISTER_MATCHER(valueDecl);
435   REGISTER_MATCHER(varDecl);
436   REGISTER_MATCHER(variableArrayType);
437   REGISTER_MATCHER(voidType);
438   REGISTER_MATCHER(whileStmt);
439   REGISTER_MATCHER(withInitializer);
440 }
441 
442 RegistryMaps::~RegistryMaps() {}
443 
444 static llvm::ManagedStatic<RegistryMaps> RegistryData;
445 
446 } // anonymous namespace
447 
448 // static
449 llvm::Optional<MatcherCtor> Registry::lookupMatcherCtor(StringRef MatcherName) {
450   auto it = RegistryData->constructors().find(MatcherName);
451   return it == RegistryData->constructors().end()
452              ? llvm::Optional<MatcherCtor>()
453              : it->second.get();
454 }
455 
456 namespace {
457 
458 llvm::raw_ostream &operator<<(llvm::raw_ostream &OS,
459                               const std::set<ASTNodeKind> &KS) {
460   unsigned Count = 0;
461   for (std::set<ASTNodeKind>::const_iterator I = KS.begin(), E = KS.end();
462        I != E; ++I) {
463     if (I != KS.begin())
464       OS << "|";
465     if (Count++ == 3) {
466       OS << "...";
467       break;
468     }
469     OS << *I;
470   }
471   return OS;
472 }
473 
474 }  // namespace
475 
476 std::vector<ArgKind> Registry::getAcceptedCompletionTypes(
477     ArrayRef<std::pair<MatcherCtor, unsigned>> Context) {
478   ASTNodeKind InitialTypes[] = {
479       ASTNodeKind::getFromNodeKind<Decl>(),
480       ASTNodeKind::getFromNodeKind<QualType>(),
481       ASTNodeKind::getFromNodeKind<Type>(),
482       ASTNodeKind::getFromNodeKind<Stmt>(),
483       ASTNodeKind::getFromNodeKind<NestedNameSpecifier>(),
484       ASTNodeKind::getFromNodeKind<NestedNameSpecifierLoc>(),
485       ASTNodeKind::getFromNodeKind<TypeLoc>()};
486 
487   // Starting with the above seed of acceptable top-level matcher types, compute
488   // the acceptable type set for the argument indicated by each context element.
489   std::set<ArgKind> TypeSet(std::begin(InitialTypes), std::end(InitialTypes));
490   for (const auto &CtxEntry : Context) {
491     MatcherCtor Ctor = CtxEntry.first;
492     unsigned ArgNumber = CtxEntry.second;
493     std::vector<ArgKind> NextTypeSet;
494     for (const ArgKind &Kind : TypeSet) {
495       if (Kind.getArgKind() == Kind.AK_Matcher &&
496           Ctor->isConvertibleTo(Kind.getMatcherKind()) &&
497           (Ctor->isVariadic() || ArgNumber < Ctor->getNumArgs()))
498         Ctor->getArgKinds(Kind.getMatcherKind(), ArgNumber, NextTypeSet);
499     }
500     TypeSet.clear();
501     TypeSet.insert(NextTypeSet.begin(), NextTypeSet.end());
502   }
503   return std::vector<ArgKind>(TypeSet.begin(), TypeSet.end());
504 }
505 
506 std::vector<MatcherCompletion>
507 Registry::getMatcherCompletions(ArrayRef<ArgKind> AcceptedTypes) {
508   std::vector<MatcherCompletion> Completions;
509 
510   // Search the registry for acceptable matchers.
511   for (const auto &M : RegistryData->constructors()) {
512     const MatcherDescriptor& Matcher = *M.getValue();
513     StringRef Name = M.getKey();
514 
515     std::set<ASTNodeKind> RetKinds;
516     unsigned NumArgs = Matcher.isVariadic() ? 1 : Matcher.getNumArgs();
517     bool IsPolymorphic = Matcher.isPolymorphic();
518     std::vector<std::vector<ArgKind>> ArgsKinds(NumArgs);
519     unsigned MaxSpecificity = 0;
520     for (const ArgKind& Kind : AcceptedTypes) {
521       if (Kind.getArgKind() != Kind.AK_Matcher)
522         continue;
523       unsigned Specificity;
524       ASTNodeKind LeastDerivedKind;
525       if (Matcher.isConvertibleTo(Kind.getMatcherKind(), &Specificity,
526                                   &LeastDerivedKind)) {
527         if (MaxSpecificity < Specificity)
528           MaxSpecificity = Specificity;
529         RetKinds.insert(LeastDerivedKind);
530         for (unsigned Arg = 0; Arg != NumArgs; ++Arg)
531           Matcher.getArgKinds(Kind.getMatcherKind(), Arg, ArgsKinds[Arg]);
532         if (IsPolymorphic)
533           break;
534       }
535     }
536 
537     if (!RetKinds.empty() && MaxSpecificity > 0) {
538       std::string Decl;
539       llvm::raw_string_ostream OS(Decl);
540 
541       if (IsPolymorphic) {
542         OS << "Matcher<T> " << Name << "(Matcher<T>";
543       } else {
544         OS << "Matcher<" << RetKinds << "> " << Name << "(";
545         for (const std::vector<ArgKind> &Arg : ArgsKinds) {
546           if (&Arg != &ArgsKinds[0])
547             OS << ", ";
548 
549           bool FirstArgKind = true;
550           std::set<ASTNodeKind> MatcherKinds;
551           // Two steps. First all non-matchers, then matchers only.
552           for (const ArgKind &AK : Arg) {
553             if (AK.getArgKind() == ArgKind::AK_Matcher) {
554               MatcherKinds.insert(AK.getMatcherKind());
555             } else {
556               if (!FirstArgKind) OS << "|";
557               FirstArgKind = false;
558               OS << AK.asString();
559             }
560           }
561           if (!MatcherKinds.empty()) {
562             if (!FirstArgKind) OS << "|";
563             OS << "Matcher<" << MatcherKinds << ">";
564           }
565         }
566       }
567       if (Matcher.isVariadic())
568         OS << "...";
569       OS << ")";
570 
571       std::string TypedText = Name;
572       TypedText += "(";
573       if (ArgsKinds.empty())
574         TypedText += ")";
575       else if (ArgsKinds[0][0].getArgKind() == ArgKind::AK_String)
576         TypedText += "\"";
577 
578       Completions.emplace_back(TypedText, OS.str(), MaxSpecificity);
579     }
580   }
581 
582   return Completions;
583 }
584 
585 // static
586 VariantMatcher Registry::constructMatcher(MatcherCtor Ctor,
587                                           SourceRange NameRange,
588                                           ArrayRef<ParserValue> Args,
589                                           Diagnostics *Error) {
590   return Ctor->create(NameRange, Args, Error);
591 }
592 
593 // static
594 VariantMatcher Registry::constructBoundMatcher(MatcherCtor Ctor,
595                                                SourceRange NameRange,
596                                                StringRef BindID,
597                                                ArrayRef<ParserValue> Args,
598                                                Diagnostics *Error) {
599   VariantMatcher Out = constructMatcher(Ctor, NameRange, Args, Error);
600   if (Out.isNull()) return Out;
601 
602   llvm::Optional<DynTypedMatcher> Result = Out.getSingleMatcher();
603   if (Result.hasValue()) {
604     llvm::Optional<DynTypedMatcher> Bound = Result->tryBind(BindID);
605     if (Bound.hasValue()) {
606       return VariantMatcher::SingleMatcher(*Bound);
607     }
608   }
609   Error->addError(NameRange, Error->ET_RegistryNotBindable);
610   return VariantMatcher();
611 }
612 
613 }  // namespace dynamic
614 }  // namespace ast_matchers
615 }  // namespace clang
616