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/AST/ASTTypeTraits.h"
18 #include "clang/ASTMatchers/ASTMatchers.h"
19 #include "clang/ASTMatchers/Dynamic/Diagnostics.h"
20 #include "clang/ASTMatchers/Dynamic/VariantValue.h"
21 #include "llvm/ADT/Optional.h"
22 #include "llvm/ADT/STLExtras.h"
23 #include "llvm/ADT/StringMap.h"
24 #include "llvm/ADT/StringRef.h"
25 #include "llvm/Support/ManagedStatic.h"
26 #include "llvm/Support/raw_ostream.h"
27 #include <cassert>
28 #include <iterator>
29 #include <memory>
30 #include <set>
31 #include <string>
32 #include <utility>
33 #include <vector>
34 
35 using namespace clang::ast_type_traits;
36 
37 namespace clang {
38 namespace ast_matchers {
39 namespace dynamic {
40 
41 namespace {
42 
43 using internal::MatcherDescriptor;
44 
45 using ConstructorMap = llvm::StringMap<std::unique_ptr<const MatcherDescriptor>>;
46 
47 class RegistryMaps {
48 public:
49   RegistryMaps();
50   ~RegistryMaps();
51 
52   const ConstructorMap &constructors() const { return Constructors; }
53 
54 private:
55   void registerMatcher(StringRef MatcherName,
56                        std::unique_ptr<MatcherDescriptor> Callback);
57 
58   ConstructorMap Constructors;
59 };
60 
61 } // namespace
62 
63 void RegistryMaps::registerMatcher(
64     StringRef MatcherName, std::unique_ptr<MatcherDescriptor> Callback) {
65   assert(Constructors.find(MatcherName) == Constructors.end());
66   Constructors[MatcherName] = std::move(Callback);
67 }
68 
69 #define REGISTER_MATCHER(name)                                                 \
70   registerMatcher(#name, internal::makeMatcherAutoMarshall(                    \
71                              ::clang::ast_matchers::name, #name));
72 
73 #define REGISTER_MATCHER_OVERLOAD(name)                                        \
74   registerMatcher(#name,                                                       \
75       llvm::make_unique<internal::OverloadedMatcherDescriptor>(name##Callbacks))
76 
77 #define SPECIFIC_MATCHER_OVERLOAD(name, Id)                                    \
78   static_cast<::clang::ast_matchers::name##_Type##Id>(                         \
79       ::clang::ast_matchers::name)
80 
81 #define MATCHER_OVERLOAD_ENTRY(name, Id)                                       \
82         internal::makeMatcherAutoMarshall(SPECIFIC_MATCHER_OVERLOAD(name, Id), \
83                                           #name)
84 
85 #define REGISTER_OVERLOADED_2(name)                                            \
86   do {                                                                         \
87     std::unique_ptr<MatcherDescriptor> name##Callbacks[] = {                   \
88         MATCHER_OVERLOAD_ENTRY(name, 0),                                       \
89         MATCHER_OVERLOAD_ENTRY(name, 1)};                                      \
90     REGISTER_MATCHER_OVERLOAD(name);                                           \
91   } while (false)
92 
93 /// \brief Generate a registry map with all the known matchers.
94 RegistryMaps::RegistryMaps() {
95   // TODO: Here is the list of the missing matchers, grouped by reason.
96   //
97   // Need Variant/Parser fixes:
98   // ofKind
99   //
100   // Polymorphic + argument overload:
101   // findAll
102   //
103   // Other:
104   // equalsNode
105 
106   REGISTER_OVERLOADED_2(callee);
107   REGISTER_OVERLOADED_2(hasPrefix);
108   REGISTER_OVERLOADED_2(hasType);
109   REGISTER_OVERLOADED_2(isDerivedFrom);
110   REGISTER_OVERLOADED_2(isSameOrDerivedFrom);
111   REGISTER_OVERLOADED_2(loc);
112   REGISTER_OVERLOADED_2(pointsTo);
113   REGISTER_OVERLOADED_2(references);
114   REGISTER_OVERLOADED_2(thisPointerType);
115 
116   std::unique_ptr<MatcherDescriptor> equalsCallbacks[] = {
117       MATCHER_OVERLOAD_ENTRY(equals, 0),
118       MATCHER_OVERLOAD_ENTRY(equals, 1),
119       MATCHER_OVERLOAD_ENTRY(equals, 2),
120   };
121   REGISTER_MATCHER_OVERLOAD(equals);
122 
123   REGISTER_MATCHER(accessSpecDecl);
124   REGISTER_MATCHER(addrLabelExpr);
125   REGISTER_MATCHER(alignOfExpr);
126   REGISTER_MATCHER(allOf);
127   REGISTER_MATCHER(anyOf);
128   REGISTER_MATCHER(anything);
129   REGISTER_MATCHER(argumentCountIs);
130   REGISTER_MATCHER(arraySubscriptExpr);
131   REGISTER_MATCHER(arrayType);
132   REGISTER_MATCHER(asmStmt);
133   REGISTER_MATCHER(asString);
134   REGISTER_MATCHER(atomicExpr);
135   REGISTER_MATCHER(atomicType);
136   REGISTER_MATCHER(autoType);
137   REGISTER_MATCHER(binaryOperator);
138   REGISTER_MATCHER(binaryConditionalOperator);
139   REGISTER_MATCHER(blockPointerType);
140   REGISTER_MATCHER(booleanType);
141   REGISTER_MATCHER(breakStmt);
142   REGISTER_MATCHER(builtinType);
143   REGISTER_MATCHER(callExpr);
144   REGISTER_MATCHER(caseStmt);
145   REGISTER_MATCHER(castExpr);
146   REGISTER_MATCHER(characterLiteral);
147   REGISTER_MATCHER(classTemplateDecl);
148   REGISTER_MATCHER(classTemplateSpecializationDecl);
149   REGISTER_MATCHER(complexType);
150   REGISTER_MATCHER(compoundLiteralExpr);
151   REGISTER_MATCHER(compoundStmt);
152   REGISTER_MATCHER(conditionalOperator);
153   REGISTER_MATCHER(constantArrayType);
154   REGISTER_MATCHER(containsDeclaration);
155   REGISTER_MATCHER(continueStmt);
156   REGISTER_MATCHER(cStyleCastExpr);
157   REGISTER_MATCHER(cudaKernelCallExpr);
158   REGISTER_MATCHER(cxxBindTemporaryExpr);
159   REGISTER_MATCHER(cxxBoolLiteral);
160   REGISTER_MATCHER(cxxCatchStmt);
161   REGISTER_MATCHER(cxxConstCastExpr);
162   REGISTER_MATCHER(cxxConstructExpr);
163   REGISTER_MATCHER(cxxConstructorDecl);
164   REGISTER_MATCHER(cxxConversionDecl);
165   REGISTER_MATCHER(cxxCtorInitializer);
166   REGISTER_MATCHER(cxxDefaultArgExpr);
167   REGISTER_MATCHER(cxxDeleteExpr);
168   REGISTER_MATCHER(cxxDestructorDecl);
169   REGISTER_MATCHER(cxxDynamicCastExpr);
170   REGISTER_MATCHER(cxxForRangeStmt);
171   REGISTER_MATCHER(cxxFunctionalCastExpr);
172   REGISTER_MATCHER(cxxMemberCallExpr);
173   REGISTER_MATCHER(cxxMethodDecl);
174   REGISTER_MATCHER(cxxNewExpr);
175   REGISTER_MATCHER(cxxNullPtrLiteralExpr);
176   REGISTER_MATCHER(cxxOperatorCallExpr);
177   REGISTER_MATCHER(cxxRecordDecl);
178   REGISTER_MATCHER(cxxReinterpretCastExpr);
179   REGISTER_MATCHER(cxxStaticCastExpr);
180   REGISTER_MATCHER(cxxStdInitializerListExpr);
181   REGISTER_MATCHER(cxxTemporaryObjectExpr);
182   REGISTER_MATCHER(cxxThisExpr);
183   REGISTER_MATCHER(cxxThrowExpr);
184   REGISTER_MATCHER(cxxTryStmt);
185   REGISTER_MATCHER(cxxUnresolvedConstructExpr);
186   REGISTER_MATCHER(decayedType);
187   REGISTER_MATCHER(decl);
188   REGISTER_MATCHER(declaratorDecl);
189   REGISTER_MATCHER(declCountIs);
190   REGISTER_MATCHER(declRefExpr);
191   REGISTER_MATCHER(declStmt);
192   REGISTER_MATCHER(defaultStmt);
193   REGISTER_MATCHER(dependentSizedArrayType);
194   REGISTER_MATCHER(designatedInitExpr);
195   REGISTER_MATCHER(designatorCountIs);
196   REGISTER_MATCHER(doStmt);
197   REGISTER_MATCHER(eachOf);
198   REGISTER_MATCHER(elaboratedType);
199   REGISTER_MATCHER(enumConstantDecl);
200   REGISTER_MATCHER(enumDecl);
201   REGISTER_MATCHER(enumType);
202   REGISTER_MATCHER(equalsBoundNode);
203   REGISTER_MATCHER(equalsIntegralValue);
204   REGISTER_MATCHER(explicitCastExpr);
205   REGISTER_MATCHER(expr);
206   REGISTER_MATCHER(exprWithCleanups);
207   REGISTER_MATCHER(fieldDecl);
208   REGISTER_MATCHER(floatLiteral);
209   REGISTER_MATCHER(forEach);
210   REGISTER_MATCHER(forEachArgumentWithParam);
211   REGISTER_MATCHER(forEachConstructorInitializer);
212   REGISTER_MATCHER(forEachDescendant);
213   REGISTER_MATCHER(forEachOverridden);
214   REGISTER_MATCHER(forEachSwitchCase);
215   REGISTER_MATCHER(forField);
216   REGISTER_MATCHER(forFunction);
217   REGISTER_MATCHER(forStmt);
218   REGISTER_MATCHER(friendDecl);
219   REGISTER_MATCHER(functionDecl);
220   REGISTER_MATCHER(functionProtoType);
221   REGISTER_MATCHER(functionTemplateDecl);
222   REGISTER_MATCHER(functionType);
223   REGISTER_MATCHER(gnuNullExpr);
224   REGISTER_MATCHER(gotoStmt);
225   REGISTER_MATCHER(has);
226   REGISTER_MATCHER(hasAncestor);
227   REGISTER_MATCHER(hasAnyArgument);
228   REGISTER_MATCHER(hasAnyConstructorInitializer);
229   REGISTER_MATCHER(hasAnyDeclaration);
230   REGISTER_MATCHER(hasAnyName);
231   REGISTER_MATCHER(hasAnyParameter);
232   REGISTER_MATCHER(hasAnySubstatement);
233   REGISTER_MATCHER(hasAnyTemplateArgument);
234   REGISTER_MATCHER(hasAnyUsingShadowDecl);
235   REGISTER_MATCHER(hasArgument);
236   REGISTER_MATCHER(hasArgumentOfType);
237   REGISTER_MATCHER(hasAttr);
238   REGISTER_MATCHER(hasAutomaticStorageDuration);
239   REGISTER_MATCHER(hasBase);
240   REGISTER_MATCHER(hasBitWidth);
241   REGISTER_MATCHER(hasBody);
242   REGISTER_MATCHER(hasCanonicalType);
243   REGISTER_MATCHER(hasCaseConstant);
244   REGISTER_MATCHER(hasCastKind);
245   REGISTER_MATCHER(hasCondition);
246   REGISTER_MATCHER(hasConditionVariableStatement);
247   REGISTER_MATCHER(hasDecayedType);
248   REGISTER_MATCHER(hasDeclaration);
249   REGISTER_MATCHER(hasDeclContext);
250   REGISTER_MATCHER(hasDeducedType);
251   REGISTER_MATCHER(hasDescendant);
252   REGISTER_MATCHER(hasDestinationType);
253   REGISTER_MATCHER(hasDynamicExceptionSpec);
254   REGISTER_MATCHER(hasEitherOperand);
255   REGISTER_MATCHER(hasElementType);
256   REGISTER_MATCHER(hasElse);
257   REGISTER_MATCHER(hasExternalFormalLinkage);
258   REGISTER_MATCHER(hasFalseExpression);
259   REGISTER_MATCHER(hasGlobalStorage);
260   REGISTER_MATCHER(hasImplicitDestinationType);
261   REGISTER_MATCHER(hasInClassInitializer);
262   REGISTER_MATCHER(hasIncrement);
263   REGISTER_MATCHER(hasIndex);
264   REGISTER_MATCHER(hasInitializer);
265   REGISTER_MATCHER(hasKeywordSelector);
266   REGISTER_MATCHER(hasLHS);
267   REGISTER_MATCHER(hasLocalQualifiers);
268   REGISTER_MATCHER(hasLocalStorage);
269   REGISTER_MATCHER(hasLoopInit);
270   REGISTER_MATCHER(hasLoopVariable);
271   REGISTER_MATCHER(hasMethod);
272   REGISTER_MATCHER(hasName);
273   REGISTER_MATCHER(hasNullSelector);
274   REGISTER_MATCHER(hasObjectExpression);
275   REGISTER_MATCHER(hasOperatorName);
276   REGISTER_MATCHER(hasOverloadedOperatorName);
277   REGISTER_MATCHER(hasParameter);
278   REGISTER_MATCHER(hasParent);
279   REGISTER_MATCHER(hasQualifier);
280   REGISTER_MATCHER(hasRangeInit);
281   REGISTER_MATCHER(hasReceiverType);
282   REGISTER_MATCHER(hasReplacementType);
283   REGISTER_MATCHER(hasReturnValue);
284   REGISTER_MATCHER(hasRHS);
285   REGISTER_MATCHER(hasSelector);
286   REGISTER_MATCHER(hasSingleDecl);
287   REGISTER_MATCHER(hasSize);
288   REGISTER_MATCHER(hasSizeExpr);
289   REGISTER_MATCHER(hasSourceExpression);
290   REGISTER_MATCHER(hasStaticStorageDuration);
291   REGISTER_MATCHER(hasSyntacticForm);
292   REGISTER_MATCHER(hasTargetDecl);
293   REGISTER_MATCHER(hasTemplateArgument);
294   REGISTER_MATCHER(hasThen);
295   REGISTER_MATCHER(hasThreadStorageDuration);
296   REGISTER_MATCHER(hasTrueExpression);
297   REGISTER_MATCHER(hasTypeLoc);
298   REGISTER_MATCHER(hasUnaryOperand);
299   REGISTER_MATCHER(hasUnarySelector);
300   REGISTER_MATCHER(hasUnderlyingDecl);
301   REGISTER_MATCHER(hasUnqualifiedDesugaredType);
302   REGISTER_MATCHER(hasValueType);
303   REGISTER_MATCHER(ifStmt);
304   REGISTER_MATCHER(ignoringImplicit);
305   REGISTER_MATCHER(ignoringImpCasts);
306   REGISTER_MATCHER(ignoringParenCasts);
307   REGISTER_MATCHER(ignoringParenImpCasts);
308   REGISTER_MATCHER(ignoringParens);
309   REGISTER_MATCHER(implicitCastExpr);
310   REGISTER_MATCHER(implicitValueInitExpr);
311   REGISTER_MATCHER(incompleteArrayType);
312   REGISTER_MATCHER(initListExpr);
313   REGISTER_MATCHER(injectedClassNameType);
314   REGISTER_MATCHER(innerType);
315   REGISTER_MATCHER(integerLiteral);
316   REGISTER_MATCHER(isAnonymous);
317   REGISTER_MATCHER(isAnyCharacter);
318   REGISTER_MATCHER(isAnyPointer);
319   REGISTER_MATCHER(isArrow);
320   REGISTER_MATCHER(isBaseInitializer);
321   REGISTER_MATCHER(isBitField);
322   REGISTER_MATCHER(isCatchAll);
323   REGISTER_MATCHER(isClass);
324   REGISTER_MATCHER(isConst);
325   REGISTER_MATCHER(isConstexpr);
326   REGISTER_MATCHER(isConstQualified);
327   REGISTER_MATCHER(isCopyAssignmentOperator);
328   REGISTER_MATCHER(isCopyConstructor);
329   REGISTER_MATCHER(isDefaultConstructor);
330   REGISTER_MATCHER(isDefaulted);
331   REGISTER_MATCHER(isDefinition);
332   REGISTER_MATCHER(isDeleted);
333   REGISTER_MATCHER(isExceptionVariable);
334   REGISTER_MATCHER(isExplicit);
335   REGISTER_MATCHER(isExplicitTemplateSpecialization);
336   REGISTER_MATCHER(isExpr);
337   REGISTER_MATCHER(isExternC);
338   REGISTER_MATCHER(isFinal);
339   REGISTER_MATCHER(isInline);
340   REGISTER_MATCHER(isImplicit);
341   REGISTER_MATCHER(isExpansionInFileMatching);
342   REGISTER_MATCHER(isExpansionInMainFile);
343   REGISTER_MATCHER(isInstantiated);
344   REGISTER_MATCHER(isExpansionInSystemHeader);
345   REGISTER_MATCHER(isInteger);
346   REGISTER_MATCHER(isIntegral);
347   REGISTER_MATCHER(isInTemplateInstantiation);
348   REGISTER_MATCHER(isLambda);
349   REGISTER_MATCHER(isListInitialization);
350   REGISTER_MATCHER(isMemberInitializer);
351   REGISTER_MATCHER(isMoveAssignmentOperator);
352   REGISTER_MATCHER(isMoveConstructor);
353   REGISTER_MATCHER(isNoThrow);
354   REGISTER_MATCHER(isOverride);
355   REGISTER_MATCHER(isPrivate);
356   REGISTER_MATCHER(isProtected);
357   REGISTER_MATCHER(isPublic);
358   REGISTER_MATCHER(isPure);
359   REGISTER_MATCHER(isSignedInteger);
360   REGISTER_MATCHER(isStaticStorageClass);
361   REGISTER_MATCHER(isStruct);
362   REGISTER_MATCHER(isTemplateInstantiation);
363   REGISTER_MATCHER(isUnion);
364   REGISTER_MATCHER(isUnsignedInteger);
365   REGISTER_MATCHER(isVariadic);
366   REGISTER_MATCHER(isVirtual);
367   REGISTER_MATCHER(isVirtualAsWritten);
368   REGISTER_MATCHER(isVolatileQualified);
369   REGISTER_MATCHER(isWritten);
370   REGISTER_MATCHER(labelDecl);
371   REGISTER_MATCHER(labelStmt);
372   REGISTER_MATCHER(lambdaExpr);
373   REGISTER_MATCHER(linkageSpecDecl);
374   REGISTER_MATCHER(lValueReferenceType);
375   REGISTER_MATCHER(matchesName);
376   REGISTER_MATCHER(matchesSelector);
377   REGISTER_MATCHER(materializeTemporaryExpr);
378   REGISTER_MATCHER(member);
379   REGISTER_MATCHER(memberExpr);
380   REGISTER_MATCHER(memberPointerType);
381   REGISTER_MATCHER(namedDecl);
382   REGISTER_MATCHER(namespaceAliasDecl);
383   REGISTER_MATCHER(namespaceDecl);
384   REGISTER_MATCHER(namesType);
385   REGISTER_MATCHER(nestedNameSpecifier);
386   REGISTER_MATCHER(nestedNameSpecifierLoc);
387   REGISTER_MATCHER(nullPointerConstant);
388   REGISTER_MATCHER(nullStmt);
389   REGISTER_MATCHER(numSelectorArgs);
390   REGISTER_MATCHER(ofClass);
391   REGISTER_MATCHER(objcCategoryDecl);
392   REGISTER_MATCHER(objcCategoryImplDecl);
393   REGISTER_MATCHER(objcImplementationDecl);
394   REGISTER_MATCHER(objcInterfaceDecl);
395   REGISTER_MATCHER(objcIvarDecl);
396   REGISTER_MATCHER(objcMessageExpr);
397   REGISTER_MATCHER(objcMethodDecl);
398   REGISTER_MATCHER(objcObjectPointerType);
399   REGISTER_MATCHER(objcPropertyDecl);
400   REGISTER_MATCHER(objcProtocolDecl);
401   REGISTER_MATCHER(on);
402   REGISTER_MATCHER(onImplicitObjectArgument);
403   REGISTER_MATCHER(opaqueValueExpr);
404   REGISTER_MATCHER(parameterCountIs);
405   REGISTER_MATCHER(parenExpr);
406   REGISTER_MATCHER(parenListExpr);
407   REGISTER_MATCHER(parenType);
408   REGISTER_MATCHER(parmVarDecl);
409   REGISTER_MATCHER(pointee);
410   REGISTER_MATCHER(pointerType);
411   REGISTER_MATCHER(predefinedExpr);
412   REGISTER_MATCHER(qualType);
413   REGISTER_MATCHER(realFloatingPointType);
414   REGISTER_MATCHER(recordDecl);
415   REGISTER_MATCHER(recordType);
416   REGISTER_MATCHER(referenceType);
417   REGISTER_MATCHER(refersToDeclaration);
418   REGISTER_MATCHER(refersToIntegralType);
419   REGISTER_MATCHER(refersToType);
420   REGISTER_MATCHER(requiresZeroInitialization);
421   REGISTER_MATCHER(returns);
422   REGISTER_MATCHER(returnStmt);
423   REGISTER_MATCHER(rValueReferenceType);
424   REGISTER_MATCHER(sizeOfExpr);
425   REGISTER_MATCHER(specifiesNamespace);
426   REGISTER_MATCHER(specifiesType);
427   REGISTER_MATCHER(specifiesTypeLoc);
428   REGISTER_MATCHER(statementCountIs);
429   REGISTER_MATCHER(staticAssertDecl);
430   REGISTER_MATCHER(stmt);
431   REGISTER_MATCHER(stmtExpr);
432   REGISTER_MATCHER(stringLiteral);
433   REGISTER_MATCHER(substNonTypeTemplateParmExpr);
434   REGISTER_MATCHER(substTemplateTypeParmType);
435   REGISTER_MATCHER(switchCase);
436   REGISTER_MATCHER(switchStmt);
437   REGISTER_MATCHER(templateArgument);
438   REGISTER_MATCHER(templateName);
439   REGISTER_MATCHER(templateArgumentCountIs);
440   REGISTER_MATCHER(templateSpecializationType);
441   REGISTER_MATCHER(templateTypeParmDecl);
442   REGISTER_MATCHER(templateTypeParmType);
443   REGISTER_MATCHER(throughUsingDecl);
444   REGISTER_MATCHER(to);
445   REGISTER_MATCHER(translationUnitDecl);
446   REGISTER_MATCHER(type);
447   REGISTER_MATCHER(typedefDecl);
448   REGISTER_MATCHER(typedefNameDecl);
449   REGISTER_MATCHER(typedefType);
450   REGISTER_MATCHER(typeAliasDecl);
451   REGISTER_MATCHER(typeAliasTemplateDecl);
452   REGISTER_MATCHER(typeLoc);
453   REGISTER_MATCHER(unaryExprOrTypeTraitExpr);
454   REGISTER_MATCHER(unaryOperator);
455   REGISTER_MATCHER(unaryTransformType);
456   REGISTER_MATCHER(unless);
457   REGISTER_MATCHER(unresolvedLookupExpr);
458   REGISTER_MATCHER(unresolvedUsingTypenameDecl);
459   REGISTER_MATCHER(unresolvedUsingValueDecl);
460   REGISTER_MATCHER(userDefinedLiteral);
461   REGISTER_MATCHER(usingDecl);
462   REGISTER_MATCHER(usingDirectiveDecl);
463   REGISTER_MATCHER(valueDecl);
464   REGISTER_MATCHER(varDecl);
465   REGISTER_MATCHER(variableArrayType);
466   REGISTER_MATCHER(voidType);
467   REGISTER_MATCHER(whileStmt);
468   REGISTER_MATCHER(withInitializer);
469 }
470 
471 RegistryMaps::~RegistryMaps() = default;
472 
473 static llvm::ManagedStatic<RegistryMaps> RegistryData;
474 
475 // static
476 llvm::Optional<MatcherCtor> Registry::lookupMatcherCtor(StringRef MatcherName) {
477   auto it = RegistryData->constructors().find(MatcherName);
478   return it == RegistryData->constructors().end()
479              ? llvm::Optional<MatcherCtor>()
480              : it->second.get();
481 }
482 
483 static llvm::raw_ostream &operator<<(llvm::raw_ostream &OS,
484                                      const std::set<ASTNodeKind> &KS) {
485   unsigned Count = 0;
486   for (std::set<ASTNodeKind>::const_iterator I = KS.begin(), E = KS.end();
487        I != E; ++I) {
488     if (I != KS.begin())
489       OS << "|";
490     if (Count++ == 3) {
491       OS << "...";
492       break;
493     }
494     OS << *I;
495   }
496   return OS;
497 }
498 
499 std::vector<ArgKind> Registry::getAcceptedCompletionTypes(
500     ArrayRef<std::pair<MatcherCtor, unsigned>> Context) {
501   ASTNodeKind InitialTypes[] = {
502       ASTNodeKind::getFromNodeKind<Decl>(),
503       ASTNodeKind::getFromNodeKind<QualType>(),
504       ASTNodeKind::getFromNodeKind<Type>(),
505       ASTNodeKind::getFromNodeKind<Stmt>(),
506       ASTNodeKind::getFromNodeKind<NestedNameSpecifier>(),
507       ASTNodeKind::getFromNodeKind<NestedNameSpecifierLoc>(),
508       ASTNodeKind::getFromNodeKind<TypeLoc>()};
509 
510   // Starting with the above seed of acceptable top-level matcher types, compute
511   // the acceptable type set for the argument indicated by each context element.
512   std::set<ArgKind> TypeSet(std::begin(InitialTypes), std::end(InitialTypes));
513   for (const auto &CtxEntry : Context) {
514     MatcherCtor Ctor = CtxEntry.first;
515     unsigned ArgNumber = CtxEntry.second;
516     std::vector<ArgKind> NextTypeSet;
517     for (const ArgKind &Kind : TypeSet) {
518       if (Kind.getArgKind() == Kind.AK_Matcher &&
519           Ctor->isConvertibleTo(Kind.getMatcherKind()) &&
520           (Ctor->isVariadic() || ArgNumber < Ctor->getNumArgs()))
521         Ctor->getArgKinds(Kind.getMatcherKind(), ArgNumber, NextTypeSet);
522     }
523     TypeSet.clear();
524     TypeSet.insert(NextTypeSet.begin(), NextTypeSet.end());
525   }
526   return std::vector<ArgKind>(TypeSet.begin(), TypeSet.end());
527 }
528 
529 std::vector<MatcherCompletion>
530 Registry::getMatcherCompletions(ArrayRef<ArgKind> AcceptedTypes) {
531   std::vector<MatcherCompletion> Completions;
532 
533   // Search the registry for acceptable matchers.
534   for (const auto &M : RegistryData->constructors()) {
535     const MatcherDescriptor& Matcher = *M.getValue();
536     StringRef Name = M.getKey();
537 
538     std::set<ASTNodeKind> RetKinds;
539     unsigned NumArgs = Matcher.isVariadic() ? 1 : Matcher.getNumArgs();
540     bool IsPolymorphic = Matcher.isPolymorphic();
541     std::vector<std::vector<ArgKind>> ArgsKinds(NumArgs);
542     unsigned MaxSpecificity = 0;
543     for (const ArgKind& Kind : AcceptedTypes) {
544       if (Kind.getArgKind() != Kind.AK_Matcher)
545         continue;
546       unsigned Specificity;
547       ASTNodeKind LeastDerivedKind;
548       if (Matcher.isConvertibleTo(Kind.getMatcherKind(), &Specificity,
549                                   &LeastDerivedKind)) {
550         if (MaxSpecificity < Specificity)
551           MaxSpecificity = Specificity;
552         RetKinds.insert(LeastDerivedKind);
553         for (unsigned Arg = 0; Arg != NumArgs; ++Arg)
554           Matcher.getArgKinds(Kind.getMatcherKind(), Arg, ArgsKinds[Arg]);
555         if (IsPolymorphic)
556           break;
557       }
558     }
559 
560     if (!RetKinds.empty() && MaxSpecificity > 0) {
561       std::string Decl;
562       llvm::raw_string_ostream OS(Decl);
563 
564       if (IsPolymorphic) {
565         OS << "Matcher<T> " << Name << "(Matcher<T>";
566       } else {
567         OS << "Matcher<" << RetKinds << "> " << Name << "(";
568         for (const std::vector<ArgKind> &Arg : ArgsKinds) {
569           if (&Arg != &ArgsKinds[0])
570             OS << ", ";
571 
572           bool FirstArgKind = true;
573           std::set<ASTNodeKind> MatcherKinds;
574           // Two steps. First all non-matchers, then matchers only.
575           for (const ArgKind &AK : Arg) {
576             if (AK.getArgKind() == ArgKind::AK_Matcher) {
577               MatcherKinds.insert(AK.getMatcherKind());
578             } else {
579               if (!FirstArgKind) OS << "|";
580               FirstArgKind = false;
581               OS << AK.asString();
582             }
583           }
584           if (!MatcherKinds.empty()) {
585             if (!FirstArgKind) OS << "|";
586             OS << "Matcher<" << MatcherKinds << ">";
587           }
588         }
589       }
590       if (Matcher.isVariadic())
591         OS << "...";
592       OS << ")";
593 
594       std::string TypedText = Name;
595       TypedText += "(";
596       if (ArgsKinds.empty())
597         TypedText += ")";
598       else if (ArgsKinds[0][0].getArgKind() == ArgKind::AK_String)
599         TypedText += "\"";
600 
601       Completions.emplace_back(TypedText, OS.str(), MaxSpecificity);
602     }
603   }
604 
605   return Completions;
606 }
607 
608 VariantMatcher Registry::constructMatcher(MatcherCtor Ctor,
609                                           SourceRange NameRange,
610                                           ArrayRef<ParserValue> Args,
611                                           Diagnostics *Error) {
612   return Ctor->create(NameRange, Args, Error);
613 }
614 
615 VariantMatcher Registry::constructBoundMatcher(MatcherCtor Ctor,
616                                                SourceRange NameRange,
617                                                StringRef BindID,
618                                                ArrayRef<ParserValue> Args,
619                                                Diagnostics *Error) {
620   VariantMatcher Out = constructMatcher(Ctor, NameRange, Args, Error);
621   if (Out.isNull()) return Out;
622 
623   llvm::Optional<DynTypedMatcher> Result = Out.getSingleMatcher();
624   if (Result.hasValue()) {
625     llvm::Optional<DynTypedMatcher> Bound = Result->tryBind(BindID);
626     if (Bound.hasValue()) {
627       return VariantMatcher::SingleMatcher(*Bound);
628     }
629   }
630   Error->addError(NameRange, Error->ET_RegistryNotBindable);
631   return VariantMatcher();
632 }
633 
634 } // namespace dynamic
635 } // namespace ast_matchers
636 } // namespace clang
637