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(cxxStdInitializerListExpr);
157   REGISTER_MATCHER(cxxTemporaryObjectExpr);
158   REGISTER_MATCHER(cxxThisExpr);
159   REGISTER_MATCHER(cxxThrowExpr);
160   REGISTER_MATCHER(cxxTryStmt);
161   REGISTER_MATCHER(cxxUnresolvedConstructExpr);
162   REGISTER_MATCHER(decayedType);
163   REGISTER_MATCHER(decl);
164   REGISTER_MATCHER(declaratorDecl);
165   REGISTER_MATCHER(declCountIs);
166   REGISTER_MATCHER(declRefExpr);
167   REGISTER_MATCHER(declStmt);
168   REGISTER_MATCHER(defaultStmt);
169   REGISTER_MATCHER(dependentSizedArrayType);
170   REGISTER_MATCHER(designatedInitExpr);
171   REGISTER_MATCHER(designatorCountIs);
172   REGISTER_MATCHER(doStmt);
173   REGISTER_MATCHER(eachOf);
174   REGISTER_MATCHER(elaboratedType);
175   REGISTER_MATCHER(enumConstantDecl);
176   REGISTER_MATCHER(enumDecl);
177   REGISTER_MATCHER(enumType);
178   REGISTER_MATCHER(equalsBoundNode);
179   REGISTER_MATCHER(equalsIntegralValue);
180   REGISTER_MATCHER(explicitCastExpr);
181   REGISTER_MATCHER(expr);
182   REGISTER_MATCHER(exprWithCleanups);
183   REGISTER_MATCHER(fieldDecl);
184   REGISTER_MATCHER(floatLiteral);
185   REGISTER_MATCHER(forEach);
186   REGISTER_MATCHER(forEachArgumentWithParam);
187   REGISTER_MATCHER(forEachConstructorInitializer);
188   REGISTER_MATCHER(forEachDescendant);
189   REGISTER_MATCHER(forEachSwitchCase);
190   REGISTER_MATCHER(forField);
191   REGISTER_MATCHER(forFunction);
192   REGISTER_MATCHER(forStmt);
193   REGISTER_MATCHER(friendDecl);
194   REGISTER_MATCHER(functionDecl);
195   REGISTER_MATCHER(functionProtoType);
196   REGISTER_MATCHER(functionTemplateDecl);
197   REGISTER_MATCHER(functionType);
198   REGISTER_MATCHER(gnuNullExpr);
199   REGISTER_MATCHER(gotoStmt);
200   REGISTER_MATCHER(has);
201   REGISTER_MATCHER(hasAncestor);
202   REGISTER_MATCHER(hasAnyArgument);
203   REGISTER_MATCHER(hasAnyConstructorInitializer);
204   REGISTER_MATCHER(hasAnyDeclaration);
205   REGISTER_MATCHER(hasAnyName);
206   REGISTER_MATCHER(hasAnyParameter);
207   REGISTER_MATCHER(hasAnySubstatement);
208   REGISTER_MATCHER(hasAnyTemplateArgument);
209   REGISTER_MATCHER(hasAnyUsingShadowDecl);
210   REGISTER_MATCHER(hasArgument);
211   REGISTER_MATCHER(hasArgumentOfType);
212   REGISTER_MATCHER(hasAttr);
213   REGISTER_MATCHER(hasAutomaticStorageDuration);
214   REGISTER_MATCHER(hasBase);
215   REGISTER_MATCHER(hasBitWidth);
216   REGISTER_MATCHER(hasBody);
217   REGISTER_MATCHER(hasCanonicalType);
218   REGISTER_MATCHER(hasCaseConstant);
219   REGISTER_MATCHER(hasCastKind);
220   REGISTER_MATCHER(hasCondition);
221   REGISTER_MATCHER(hasConditionVariableStatement);
222   REGISTER_MATCHER(hasDecayedType);
223   REGISTER_MATCHER(hasDeclaration);
224   REGISTER_MATCHER(hasDeclContext);
225   REGISTER_MATCHER(hasDeducedType);
226   REGISTER_MATCHER(hasDescendant);
227   REGISTER_MATCHER(hasDestinationType);
228   REGISTER_MATCHER(hasDynamicExceptionSpec);
229   REGISTER_MATCHER(hasEitherOperand);
230   REGISTER_MATCHER(hasElementType);
231   REGISTER_MATCHER(hasElse);
232   REGISTER_MATCHER(hasExternalFormalLinkage);
233   REGISTER_MATCHER(hasFalseExpression);
234   REGISTER_MATCHER(hasGlobalStorage);
235   REGISTER_MATCHER(hasImplicitDestinationType);
236   REGISTER_MATCHER(hasInClassInitializer);
237   REGISTER_MATCHER(hasIncrement);
238   REGISTER_MATCHER(hasIndex);
239   REGISTER_MATCHER(hasInitializer);
240   REGISTER_MATCHER(hasKeywordSelector);
241   REGISTER_MATCHER(hasLHS);
242   REGISTER_MATCHER(hasLocalQualifiers);
243   REGISTER_MATCHER(hasLocalStorage);
244   REGISTER_MATCHER(hasLoopInit);
245   REGISTER_MATCHER(hasLoopVariable);
246   REGISTER_MATCHER(hasMethod);
247   REGISTER_MATCHER(hasName);
248   REGISTER_MATCHER(hasNullSelector);
249   REGISTER_MATCHER(hasObjectExpression);
250   REGISTER_MATCHER(hasOperatorName);
251   REGISTER_MATCHER(hasOverloadedOperatorName);
252   REGISTER_MATCHER(hasParameter);
253   REGISTER_MATCHER(hasParent);
254   REGISTER_MATCHER(hasQualifier);
255   REGISTER_MATCHER(hasRangeInit);
256   REGISTER_MATCHER(hasReceiverType);
257   REGISTER_MATCHER(hasReplacementType);
258   REGISTER_MATCHER(hasReturnValue);
259   REGISTER_MATCHER(hasRHS);
260   REGISTER_MATCHER(hasSelector);
261   REGISTER_MATCHER(hasSingleDecl);
262   REGISTER_MATCHER(hasSize);
263   REGISTER_MATCHER(hasSizeExpr);
264   REGISTER_MATCHER(hasSourceExpression);
265   REGISTER_MATCHER(hasStaticStorageDuration);
266   REGISTER_MATCHER(hasSyntacticForm);
267   REGISTER_MATCHER(hasTargetDecl);
268   REGISTER_MATCHER(hasTemplateArgument);
269   REGISTER_MATCHER(hasThen);
270   REGISTER_MATCHER(hasThreadStorageDuration);
271   REGISTER_MATCHER(hasTrueExpression);
272   REGISTER_MATCHER(hasTypeLoc);
273   REGISTER_MATCHER(hasUnaryOperand);
274   REGISTER_MATCHER(hasUnarySelector);
275   REGISTER_MATCHER(hasUnderlyingDecl);
276   REGISTER_MATCHER(hasUnqualifiedDesugaredType);
277   REGISTER_MATCHER(hasValueType);
278   REGISTER_MATCHER(ifStmt);
279   REGISTER_MATCHER(ignoringImplicit);
280   REGISTER_MATCHER(ignoringImpCasts);
281   REGISTER_MATCHER(ignoringParenCasts);
282   REGISTER_MATCHER(ignoringParenImpCasts);
283   REGISTER_MATCHER(ignoringParens);
284   REGISTER_MATCHER(implicitCastExpr);
285   REGISTER_MATCHER(implicitValueInitExpr);
286   REGISTER_MATCHER(incompleteArrayType);
287   REGISTER_MATCHER(initListExpr);
288   REGISTER_MATCHER(injectedClassNameType);
289   REGISTER_MATCHER(innerType);
290   REGISTER_MATCHER(integerLiteral);
291   REGISTER_MATCHER(isAnonymous);
292   REGISTER_MATCHER(isAnyCharacter);
293   REGISTER_MATCHER(isAnyPointer);
294   REGISTER_MATCHER(isArrow);
295   REGISTER_MATCHER(isBaseInitializer);
296   REGISTER_MATCHER(isBitField);
297   REGISTER_MATCHER(isCatchAll);
298   REGISTER_MATCHER(isClass);
299   REGISTER_MATCHER(isConst);
300   REGISTER_MATCHER(isConstexpr);
301   REGISTER_MATCHER(isConstQualified);
302   REGISTER_MATCHER(isCopyAssignmentOperator);
303   REGISTER_MATCHER(isCopyConstructor);
304   REGISTER_MATCHER(isDefaultConstructor);
305   REGISTER_MATCHER(isDefaulted);
306   REGISTER_MATCHER(isDefinition);
307   REGISTER_MATCHER(isDeleted);
308   REGISTER_MATCHER(isExceptionVariable);
309   REGISTER_MATCHER(isExplicit);
310   REGISTER_MATCHER(isExplicitTemplateSpecialization);
311   REGISTER_MATCHER(isExpr);
312   REGISTER_MATCHER(isExternC);
313   REGISTER_MATCHER(isFinal);
314   REGISTER_MATCHER(isInline);
315   REGISTER_MATCHER(isImplicit);
316   REGISTER_MATCHER(isExpansionInFileMatching);
317   REGISTER_MATCHER(isExpansionInMainFile);
318   REGISTER_MATCHER(isInstantiated);
319   REGISTER_MATCHER(isExpansionInSystemHeader);
320   REGISTER_MATCHER(isInteger);
321   REGISTER_MATCHER(isIntegral);
322   REGISTER_MATCHER(isInTemplateInstantiation);
323   REGISTER_MATCHER(isLambda);
324   REGISTER_MATCHER(isListInitialization);
325   REGISTER_MATCHER(isMemberInitializer);
326   REGISTER_MATCHER(isMoveAssignmentOperator);
327   REGISTER_MATCHER(isMoveConstructor);
328   REGISTER_MATCHER(isNoThrow);
329   REGISTER_MATCHER(isOverride);
330   REGISTER_MATCHER(isPrivate);
331   REGISTER_MATCHER(isProtected);
332   REGISTER_MATCHER(isPublic);
333   REGISTER_MATCHER(isPure);
334   REGISTER_MATCHER(isSignedInteger);
335   REGISTER_MATCHER(isStaticStorageClass);
336   REGISTER_MATCHER(isStruct);
337   REGISTER_MATCHER(isTemplateInstantiation);
338   REGISTER_MATCHER(isUnion);
339   REGISTER_MATCHER(isUnsignedInteger);
340   REGISTER_MATCHER(isVariadic);
341   REGISTER_MATCHER(isVirtual);
342   REGISTER_MATCHER(isVirtualAsWritten);
343   REGISTER_MATCHER(isVolatileQualified);
344   REGISTER_MATCHER(isWritten);
345   REGISTER_MATCHER(labelDecl);
346   REGISTER_MATCHER(labelStmt);
347   REGISTER_MATCHER(lambdaExpr);
348   REGISTER_MATCHER(lValueReferenceType);
349   REGISTER_MATCHER(matchesName);
350   REGISTER_MATCHER(matchesSelector);
351   REGISTER_MATCHER(materializeTemporaryExpr);
352   REGISTER_MATCHER(member);
353   REGISTER_MATCHER(memberExpr);
354   REGISTER_MATCHER(memberPointerType);
355   REGISTER_MATCHER(namedDecl);
356   REGISTER_MATCHER(namespaceAliasDecl);
357   REGISTER_MATCHER(namespaceDecl);
358   REGISTER_MATCHER(namesType);
359   REGISTER_MATCHER(nestedNameSpecifier);
360   REGISTER_MATCHER(nestedNameSpecifierLoc);
361   REGISTER_MATCHER(nullPointerConstant);
362   REGISTER_MATCHER(nullStmt);
363   REGISTER_MATCHER(numSelectorArgs);
364   REGISTER_MATCHER(ofClass);
365   REGISTER_MATCHER(objcCategoryDecl);
366   REGISTER_MATCHER(objcInterfaceDecl);
367   REGISTER_MATCHER(objcIvarDecl);
368   REGISTER_MATCHER(objcMessageExpr);
369   REGISTER_MATCHER(objcMethodDecl);
370   REGISTER_MATCHER(objcObjectPointerType);
371   REGISTER_MATCHER(objcPropertyDecl);
372   REGISTER_MATCHER(objcProtocolDecl);
373   REGISTER_MATCHER(on);
374   REGISTER_MATCHER(onImplicitObjectArgument);
375   REGISTER_MATCHER(opaqueValueExpr);
376   REGISTER_MATCHER(parameterCountIs);
377   REGISTER_MATCHER(parenExpr);
378   REGISTER_MATCHER(parenListExpr);
379   REGISTER_MATCHER(parenType);
380   REGISTER_MATCHER(parmVarDecl);
381   REGISTER_MATCHER(pointee);
382   REGISTER_MATCHER(pointerType);
383   REGISTER_MATCHER(predefinedExpr);
384   REGISTER_MATCHER(qualType);
385   REGISTER_MATCHER(realFloatingPointType);
386   REGISTER_MATCHER(recordDecl);
387   REGISTER_MATCHER(recordType);
388   REGISTER_MATCHER(referenceType);
389   REGISTER_MATCHER(refersToDeclaration);
390   REGISTER_MATCHER(refersToIntegralType);
391   REGISTER_MATCHER(refersToType);
392   REGISTER_MATCHER(requiresZeroInitialization);
393   REGISTER_MATCHER(returns);
394   REGISTER_MATCHER(returnStmt);
395   REGISTER_MATCHER(rValueReferenceType);
396   REGISTER_MATCHER(sizeOfExpr);
397   REGISTER_MATCHER(specifiesNamespace);
398   REGISTER_MATCHER(specifiesType);
399   REGISTER_MATCHER(specifiesTypeLoc);
400   REGISTER_MATCHER(statementCountIs);
401   REGISTER_MATCHER(staticAssertDecl);
402   REGISTER_MATCHER(stmt);
403   REGISTER_MATCHER(stmtExpr);
404   REGISTER_MATCHER(stringLiteral);
405   REGISTER_MATCHER(substNonTypeTemplateParmExpr);
406   REGISTER_MATCHER(substTemplateTypeParmType);
407   REGISTER_MATCHER(switchCase);
408   REGISTER_MATCHER(switchStmt);
409   REGISTER_MATCHER(templateArgument);
410   REGISTER_MATCHER(templateName);
411   REGISTER_MATCHER(templateArgumentCountIs);
412   REGISTER_MATCHER(templateSpecializationType);
413   REGISTER_MATCHER(templateTypeParmDecl);
414   REGISTER_MATCHER(templateTypeParmType);
415   REGISTER_MATCHER(throughUsingDecl);
416   REGISTER_MATCHER(to);
417   REGISTER_MATCHER(translationUnitDecl);
418   REGISTER_MATCHER(type);
419   REGISTER_MATCHER(typedefDecl);
420   REGISTER_MATCHER(typedefNameDecl);
421   REGISTER_MATCHER(typedefType);
422   REGISTER_MATCHER(typeAliasDecl);
423   REGISTER_MATCHER(typeAliasTemplateDecl);
424   REGISTER_MATCHER(typeLoc);
425   REGISTER_MATCHER(unaryExprOrTypeTraitExpr);
426   REGISTER_MATCHER(unaryOperator);
427   REGISTER_MATCHER(unaryTransformType);
428   REGISTER_MATCHER(unless);
429   REGISTER_MATCHER(unresolvedLookupExpr);
430   REGISTER_MATCHER(unresolvedUsingTypenameDecl);
431   REGISTER_MATCHER(unresolvedUsingValueDecl);
432   REGISTER_MATCHER(userDefinedLiteral);
433   REGISTER_MATCHER(usingDecl);
434   REGISTER_MATCHER(usingDirectiveDecl);
435   REGISTER_MATCHER(valueDecl);
436   REGISTER_MATCHER(varDecl);
437   REGISTER_MATCHER(variableArrayType);
438   REGISTER_MATCHER(voidType);
439   REGISTER_MATCHER(whileStmt);
440   REGISTER_MATCHER(withInitializer);
441 }
442 
443 RegistryMaps::~RegistryMaps() {}
444 
445 static llvm::ManagedStatic<RegistryMaps> RegistryData;
446 
447 } // anonymous namespace
448 
449 // static
450 llvm::Optional<MatcherCtor> Registry::lookupMatcherCtor(StringRef MatcherName) {
451   auto it = RegistryData->constructors().find(MatcherName);
452   return it == RegistryData->constructors().end()
453              ? llvm::Optional<MatcherCtor>()
454              : it->second.get();
455 }
456 
457 namespace {
458 
459 llvm::raw_ostream &operator<<(llvm::raw_ostream &OS,
460                               const std::set<ASTNodeKind> &KS) {
461   unsigned Count = 0;
462   for (std::set<ASTNodeKind>::const_iterator I = KS.begin(), E = KS.end();
463        I != E; ++I) {
464     if (I != KS.begin())
465       OS << "|";
466     if (Count++ == 3) {
467       OS << "...";
468       break;
469     }
470     OS << *I;
471   }
472   return OS;
473 }
474 
475 }  // namespace
476 
477 std::vector<ArgKind> Registry::getAcceptedCompletionTypes(
478     ArrayRef<std::pair<MatcherCtor, unsigned>> Context) {
479   ASTNodeKind InitialTypes[] = {
480       ASTNodeKind::getFromNodeKind<Decl>(),
481       ASTNodeKind::getFromNodeKind<QualType>(),
482       ASTNodeKind::getFromNodeKind<Type>(),
483       ASTNodeKind::getFromNodeKind<Stmt>(),
484       ASTNodeKind::getFromNodeKind<NestedNameSpecifier>(),
485       ASTNodeKind::getFromNodeKind<NestedNameSpecifierLoc>(),
486       ASTNodeKind::getFromNodeKind<TypeLoc>()};
487 
488   // Starting with the above seed of acceptable top-level matcher types, compute
489   // the acceptable type set for the argument indicated by each context element.
490   std::set<ArgKind> TypeSet(std::begin(InitialTypes), std::end(InitialTypes));
491   for (const auto &CtxEntry : Context) {
492     MatcherCtor Ctor = CtxEntry.first;
493     unsigned ArgNumber = CtxEntry.second;
494     std::vector<ArgKind> NextTypeSet;
495     for (const ArgKind &Kind : TypeSet) {
496       if (Kind.getArgKind() == Kind.AK_Matcher &&
497           Ctor->isConvertibleTo(Kind.getMatcherKind()) &&
498           (Ctor->isVariadic() || ArgNumber < Ctor->getNumArgs()))
499         Ctor->getArgKinds(Kind.getMatcherKind(), ArgNumber, NextTypeSet);
500     }
501     TypeSet.clear();
502     TypeSet.insert(NextTypeSet.begin(), NextTypeSet.end());
503   }
504   return std::vector<ArgKind>(TypeSet.begin(), TypeSet.end());
505 }
506 
507 std::vector<MatcherCompletion>
508 Registry::getMatcherCompletions(ArrayRef<ArgKind> AcceptedTypes) {
509   std::vector<MatcherCompletion> Completions;
510 
511   // Search the registry for acceptable matchers.
512   for (const auto &M : RegistryData->constructors()) {
513     const MatcherDescriptor& Matcher = *M.getValue();
514     StringRef Name = M.getKey();
515 
516     std::set<ASTNodeKind> RetKinds;
517     unsigned NumArgs = Matcher.isVariadic() ? 1 : Matcher.getNumArgs();
518     bool IsPolymorphic = Matcher.isPolymorphic();
519     std::vector<std::vector<ArgKind>> ArgsKinds(NumArgs);
520     unsigned MaxSpecificity = 0;
521     for (const ArgKind& Kind : AcceptedTypes) {
522       if (Kind.getArgKind() != Kind.AK_Matcher)
523         continue;
524       unsigned Specificity;
525       ASTNodeKind LeastDerivedKind;
526       if (Matcher.isConvertibleTo(Kind.getMatcherKind(), &Specificity,
527                                   &LeastDerivedKind)) {
528         if (MaxSpecificity < Specificity)
529           MaxSpecificity = Specificity;
530         RetKinds.insert(LeastDerivedKind);
531         for (unsigned Arg = 0; Arg != NumArgs; ++Arg)
532           Matcher.getArgKinds(Kind.getMatcherKind(), Arg, ArgsKinds[Arg]);
533         if (IsPolymorphic)
534           break;
535       }
536     }
537 
538     if (!RetKinds.empty() && MaxSpecificity > 0) {
539       std::string Decl;
540       llvm::raw_string_ostream OS(Decl);
541 
542       if (IsPolymorphic) {
543         OS << "Matcher<T> " << Name << "(Matcher<T>";
544       } else {
545         OS << "Matcher<" << RetKinds << "> " << Name << "(";
546         for (const std::vector<ArgKind> &Arg : ArgsKinds) {
547           if (&Arg != &ArgsKinds[0])
548             OS << ", ";
549 
550           bool FirstArgKind = true;
551           std::set<ASTNodeKind> MatcherKinds;
552           // Two steps. First all non-matchers, then matchers only.
553           for (const ArgKind &AK : Arg) {
554             if (AK.getArgKind() == ArgKind::AK_Matcher) {
555               MatcherKinds.insert(AK.getMatcherKind());
556             } else {
557               if (!FirstArgKind) OS << "|";
558               FirstArgKind = false;
559               OS << AK.asString();
560             }
561           }
562           if (!MatcherKinds.empty()) {
563             if (!FirstArgKind) OS << "|";
564             OS << "Matcher<" << MatcherKinds << ">";
565           }
566         }
567       }
568       if (Matcher.isVariadic())
569         OS << "...";
570       OS << ")";
571 
572       std::string TypedText = Name;
573       TypedText += "(";
574       if (ArgsKinds.empty())
575         TypedText += ")";
576       else if (ArgsKinds[0][0].getArgKind() == ArgKind::AK_String)
577         TypedText += "\"";
578 
579       Completions.emplace_back(TypedText, OS.str(), MaxSpecificity);
580     }
581   }
582 
583   return Completions;
584 }
585 
586 // static
587 VariantMatcher Registry::constructMatcher(MatcherCtor Ctor,
588                                           SourceRange NameRange,
589                                           ArrayRef<ParserValue> Args,
590                                           Diagnostics *Error) {
591   return Ctor->create(NameRange, Args, Error);
592 }
593 
594 // static
595 VariantMatcher Registry::constructBoundMatcher(MatcherCtor Ctor,
596                                                SourceRange NameRange,
597                                                StringRef BindID,
598                                                ArrayRef<ParserValue> Args,
599                                                Diagnostics *Error) {
600   VariantMatcher Out = constructMatcher(Ctor, NameRange, Args, Error);
601   if (Out.isNull()) return Out;
602 
603   llvm::Optional<DynTypedMatcher> Result = Out.getSingleMatcher();
604   if (Result.hasValue()) {
605     llvm::Optional<DynTypedMatcher> Bound = Result->tryBind(BindID);
606     if (Bound.hasValue()) {
607       return VariantMatcher::SingleMatcher(*Bound);
608     }
609   }
610   Error->addError(NameRange, Error->ET_RegistryNotBindable);
611   return VariantMatcher();
612 }
613 
614 }  // namespace dynamic
615 }  // namespace ast_matchers
616 }  // namespace clang
617