clang/lib/ASTMatchers/Dynamic/Registry.cpp

//===--- Registry.cpp - Matcher registry -------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===------------------------------------------------------------===//
///
/// \file
/// \brief Registry map populated at static initialization time.
///
//===------------------------------------------------------------===//

#include "clang/ASTMatchers/Dynamic/Registry.h"

#include <utility>

#include "Marshallers.h"
#include "clang/ASTMatchers/ASTMatchers.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/ManagedStatic.h"

namespace clang {
namespace ast_matchers {
namespace dynamic {
namespace {

using internal::MatcherCreateCallback;

typedef llvm::StringMap<const MatcherCreateCallback *> ConstructorMap;
class RegistryMaps {
public:
  RegistryMaps();
  ~RegistryMaps();

  const ConstructorMap &constructors() const { return Constructors; }

private:
  void registerMatcher(StringRef MatcherName, MatcherCreateCallback *Callback);
  ConstructorMap Constructors;
};

void RegistryMaps::registerMatcher(StringRef MatcherName,
                                   MatcherCreateCallback *Callback) {
  assert(Constructors.find(MatcherName) == Constructors.end());
  Constructors[MatcherName] = Callback;
}

/// \brief MatcherCreateCallback that wraps multiple "overloads" of the same
///   matcher.
///
/// It will try every overload and generate appropriate errors for when none or
/// more than one overloads match the arguments.
class OverloadedMatcherCreateCallback : public MatcherCreateCallback {
 public:
   OverloadedMatcherCreateCallback(ArrayRef<MatcherCreateCallback *> Callbacks)
       : Overloads(Callbacks) {}

  virtual ~OverloadedMatcherCreateCallback() {
    for (size_t i = 0, e = Overloads.size(); i != e; ++i)
      delete Overloads[i];
  }

  virtual VariantMatcher run(const SourceRange &NameRange,
                             ArrayRef<ParserValue> Args,
                             Diagnostics *Error) const {
    std::vector<VariantMatcher> Constructed;
    Diagnostics::OverloadContext Ctx(Error);
    for (size_t i = 0, e = Overloads.size(); i != e; ++i) {
      VariantMatcher SubMatcher = Overloads[i]->run(NameRange, Args, Error);
      if (!SubMatcher.isNull()) {
        Constructed.push_back(SubMatcher);
      }
    }

    if (Constructed.empty()) return VariantMatcher();  // No overload matched.
    // We ignore the errors if any matcher succeeded.
    Ctx.revertErrors();
    if (Constructed.size() > 1) {
      // More than one constructed. It is ambiguous.
      Error->addError(NameRange, Error->ET_RegistryAmbiguousOverload);
      return VariantMatcher();
    }
    return Constructed[0];
  }

 private:
  std::vector<MatcherCreateCallback*> Overloads;
};

#define REGISTER_MATCHER(name)                                                 \
  registerMatcher(#name, internal::makeMatcherAutoMarshall(                    \
                             ::clang::ast_matchers::name, #name));

#define SPECIFIC_MATCHER_OVERLOAD(name, Id)                                    \
  static_cast< ::clang::ast_matchers::name##_Type##Id>(                        \
      ::clang::ast_matchers::name)

#define REGISTER_OVERLOADED_2(name)                                            \
  do {                                                                         \
    MatcherCreateCallback *Callbacks[] = {                                     \
      internal::makeMatcherAutoMarshall(SPECIFIC_MATCHER_OVERLOAD(name, 0),    \
                                        #name),                                \
      internal::makeMatcherAutoMarshall(SPECIFIC_MATCHER_OVERLOAD(name, 1),    \
                                        #name)                                 \
    };                                                                         \
    registerMatcher(#name, new OverloadedMatcherCreateCallback(Callbacks));    \
  } while (0)

/// \brief Class that allows us to bind to the constructor of an
///   \c ArgumentAdaptingMatcher.
/// This class, together with \c collectAdaptativeMatcherOverloads below, help
/// us detect the Adapter class and create overload functions for the
/// appropriate To/From types.
/// We instantiate the \c createAdatingMatcher function for every type in
/// \c FromTypes. \c ToTypes is handled on the marshaller side by using the
/// \c ReturnTypes typedef in \c ArgumentAdaptingMatcher.
template <template <typename ToArg, typename FromArg> class ArgumentAdapterT,
          typename FromTypes, typename ToTypes>
struct AdaptativeMatcherWrapper {
  template <typename FromArg>
  static ast_matchers::internal::ArgumentAdaptingMatcher<
      ArgumentAdapterT, FromArg, FromTypes, ToTypes>
  createAdatingMatcher(
      const ast_matchers::internal::Matcher<FromArg> &InnerMatcher) {
    return ast_matchers::internal::ArgumentAdaptingMatcher<
        ArgumentAdapterT, FromArg, FromTypes, ToTypes>(InnerMatcher);
  }

  static void collectOverloads(StringRef Name,
                               std::vector<MatcherCreateCallback *> &Out,
                               ast_matchers::internal::EmptyTypeList) {}

  template <typename FromTypeList>
  static void collectOverloads(StringRef Name,
                               std::vector<MatcherCreateCallback *> &Out,
                               FromTypeList TypeList) {
    Out.push_back(internal::makeMatcherAutoMarshall(
        &createAdatingMatcher<typename FromTypeList::head>, Name));
    collectOverloads(Name, Out, typename FromTypeList::tail());
  }

  static void collectOverloads(StringRef Name,
                               std::vector<MatcherCreateCallback *> &Out) {
    collectOverloads(Name, Out, FromTypes());
  }
};

template <template <typename ToArg, typename FromArg> class ArgumentAdapterT,
          typename DummyArg, typename FromTypes, typename ToTypes>
void collectAdaptativeMatcherOverloads(
    StringRef Name,
    ast_matchers::internal::ArgumentAdaptingMatcher<ArgumentAdapterT, DummyArg,
                                                    FromTypes, ToTypes>(
        *func)(const ast_matchers::internal::Matcher<DummyArg> &),
    std::vector<MatcherCreateCallback *> &Out) {
  AdaptativeMatcherWrapper<ArgumentAdapterT, FromTypes,
                           ToTypes>::collectOverloads(Name, Out);
}

#define REGISTER_ADAPTATIVE(name)                                              \
  do {                                                                         \
    std::vector<MatcherCreateCallback *> Overloads;                            \
    collectAdaptativeMatcherOverloads(#name, &name<Decl>, Overloads);          \
    registerMatcher(#name, new OverloadedMatcherCreateCallback(Overloads));    \
  } while (0)

/// \brief Generate a registry map with all the known matchers.
RegistryMaps::RegistryMaps() {
  // TODO: Here is the list of the missing matchers, grouped by reason.
  //
  // Need Variant/Parser fixes:
  // ofKind
  //
  // Polymorphic + argument overload:
  // unless
  // eachOf
  // anyOf
  // allOf
  // findAll
  //
  // Other:
  // loc
  // equals
  // equalsNode
  // hasDeclaration

  REGISTER_OVERLOADED_2(callee);
  REGISTER_OVERLOADED_2(hasPrefix);
  REGISTER_OVERLOADED_2(hasType);
  REGISTER_OVERLOADED_2(isDerivedFrom);
  REGISTER_OVERLOADED_2(isSameOrDerivedFrom);
  REGISTER_OVERLOADED_2(pointsTo);
  REGISTER_OVERLOADED_2(references);
  REGISTER_OVERLOADED_2(thisPointerType);

  REGISTER_ADAPTATIVE(forEach);
  REGISTER_ADAPTATIVE(forEachDescendant);
  REGISTER_ADAPTATIVE(has);
  REGISTER_ADAPTATIVE(hasAncestor);
  REGISTER_ADAPTATIVE(hasDescendant);
  REGISTER_ADAPTATIVE(hasParent);

  REGISTER_MATCHER(accessSpecDecl);
  REGISTER_MATCHER(alignOfExpr);
  REGISTER_MATCHER(anything);
  REGISTER_MATCHER(argumentCountIs);
  REGISTER_MATCHER(arraySubscriptExpr);
  REGISTER_MATCHER(arrayType);
  REGISTER_MATCHER(asString);
  REGISTER_MATCHER(asmStmt);
  REGISTER_MATCHER(atomicType);
  REGISTER_MATCHER(autoType);
  REGISTER_MATCHER(binaryOperator);
  REGISTER_MATCHER(bindTemporaryExpr);
  REGISTER_MATCHER(blockPointerType);
  REGISTER_MATCHER(boolLiteral);
  REGISTER_MATCHER(breakStmt);
  REGISTER_MATCHER(builtinType);
  REGISTER_MATCHER(cStyleCastExpr);
  REGISTER_MATCHER(callExpr);
  REGISTER_MATCHER(castExpr);
  REGISTER_MATCHER(catchStmt);
  REGISTER_MATCHER(characterLiteral);
  REGISTER_MATCHER(classTemplateDecl);
  REGISTER_MATCHER(classTemplateSpecializationDecl);
  REGISTER_MATCHER(complexType);
  REGISTER_MATCHER(compoundLiteralExpr);
  REGISTER_MATCHER(compoundStmt);
  REGISTER_MATCHER(conditionalOperator);
  REGISTER_MATCHER(constCastExpr);
  REGISTER_MATCHER(constantArrayType);
  REGISTER_MATCHER(constructExpr);
  REGISTER_MATCHER(constructorDecl);
  REGISTER_MATCHER(containsDeclaration);
  REGISTER_MATCHER(continueStmt);
  REGISTER_MATCHER(ctorInitializer);
  REGISTER_MATCHER(decl);
  REGISTER_MATCHER(declCountIs);
  REGISTER_MATCHER(declRefExpr);
  REGISTER_MATCHER(declStmt);
  REGISTER_MATCHER(defaultArgExpr);
  REGISTER_MATCHER(deleteExpr);
  REGISTER_MATCHER(dependentSizedArrayType);
  REGISTER_MATCHER(destructorDecl);
  REGISTER_MATCHER(doStmt);
  REGISTER_MATCHER(dynamicCastExpr);
  REGISTER_MATCHER(elaboratedType);
  REGISTER_MATCHER(enumConstantDecl);
  REGISTER_MATCHER(enumDecl);
  REGISTER_MATCHER(explicitCastExpr);
  REGISTER_MATCHER(expr);
  REGISTER_MATCHER(fieldDecl);
  REGISTER_MATCHER(floatLiteral);
  REGISTER_MATCHER(forField);
  REGISTER_MATCHER(forRangeStmt);
  REGISTER_MATCHER(forStmt);
  REGISTER_MATCHER(functionDecl);
  REGISTER_MATCHER(functionTemplateDecl);
  REGISTER_MATCHER(functionType);
  REGISTER_MATCHER(functionalCastExpr);
  REGISTER_MATCHER(gotoStmt);
  REGISTER_MATCHER(hasAnyArgument);
  REGISTER_MATCHER(hasAnyConstructorInitializer);
  REGISTER_MATCHER(hasAnyParameter);
  REGISTER_MATCHER(hasAnySubstatement);
  REGISTER_MATCHER(hasAnyTemplateArgument);
  REGISTER_MATCHER(hasAnyUsingShadowDecl);
  REGISTER_MATCHER(hasArgument);
  REGISTER_MATCHER(hasArgumentOfType);
  REGISTER_MATCHER(hasBase);
  REGISTER_MATCHER(hasBody);
  REGISTER_MATCHER(hasCanonicalType);
  REGISTER_MATCHER(hasCondition);
  REGISTER_MATCHER(hasConditionVariableStatement);
  REGISTER_MATCHER(hasDeclContext);
  REGISTER_MATCHER(hasDeducedType);
  REGISTER_MATCHER(hasDestinationType);
  REGISTER_MATCHER(hasEitherOperand);
  REGISTER_MATCHER(hasElementType);
  REGISTER_MATCHER(hasFalseExpression);
  REGISTER_MATCHER(hasImplicitDestinationType);
  REGISTER_MATCHER(hasIncrement);
  REGISTER_MATCHER(hasIndex);
  REGISTER_MATCHER(hasInitializer);
  REGISTER_MATCHER(hasLHS);
  REGISTER_MATCHER(hasLocalQualifiers);
  REGISTER_MATCHER(hasLoopInit);
  REGISTER_MATCHER(hasMethod);
  REGISTER_MATCHER(hasName);
  REGISTER_MATCHER(hasObjectExpression);
  REGISTER_MATCHER(hasOperatorName);
  REGISTER_MATCHER(hasOverloadedOperatorName);
  REGISTER_MATCHER(hasParameter);
  REGISTER_MATCHER(hasQualifier);
  REGISTER_MATCHER(hasRHS);
  REGISTER_MATCHER(hasSingleDecl);
  REGISTER_MATCHER(hasSize);
  REGISTER_MATCHER(hasSizeExpr);
  REGISTER_MATCHER(hasSourceExpression);
  REGISTER_MATCHER(hasTargetDecl);
  REGISTER_MATCHER(hasTemplateArgument);
  REGISTER_MATCHER(hasTrueExpression);
  REGISTER_MATCHER(hasUnaryOperand);
  REGISTER_MATCHER(hasValueType);
  REGISTER_MATCHER(ifStmt);
  REGISTER_MATCHER(ignoringImpCasts);
  REGISTER_MATCHER(ignoringParenCasts);
  REGISTER_MATCHER(ignoringParenImpCasts);
  REGISTER_MATCHER(implicitCastExpr);
  REGISTER_MATCHER(incompleteArrayType);
  REGISTER_MATCHER(initListExpr);
  REGISTER_MATCHER(innerType);
  REGISTER_MATCHER(integerLiteral);
  REGISTER_MATCHER(isArrow);
  REGISTER_MATCHER(isConstQualified);
  REGISTER_MATCHER(isDefinition);
  REGISTER_MATCHER(isExplicitTemplateSpecialization);
  REGISTER_MATCHER(isExternC);
  REGISTER_MATCHER(isImplicit);
  REGISTER_MATCHER(isInteger);
  REGISTER_MATCHER(isOverride);
  REGISTER_MATCHER(isPrivate);
  REGISTER_MATCHER(isProtected);
  REGISTER_MATCHER(isPublic);
  REGISTER_MATCHER(isTemplateInstantiation);
  REGISTER_MATCHER(isVirtual);
  REGISTER_MATCHER(isWritten);
  REGISTER_MATCHER(lValueReferenceType);
  REGISTER_MATCHER(labelStmt);
  REGISTER_MATCHER(lambdaExpr);
  REGISTER_MATCHER(matchesName);
  REGISTER_MATCHER(materializeTemporaryExpr);
  REGISTER_MATCHER(member);
  REGISTER_MATCHER(memberCallExpr);
  REGISTER_MATCHER(memberExpr);
  REGISTER_MATCHER(memberPointerType);
  REGISTER_MATCHER(methodDecl);
  REGISTER_MATCHER(namedDecl);
  REGISTER_MATCHER(namesType);
  REGISTER_MATCHER(namespaceDecl);
  REGISTER_MATCHER(nestedNameSpecifier);
  REGISTER_MATCHER(nestedNameSpecifierLoc);
  REGISTER_MATCHER(newExpr);
  REGISTER_MATCHER(nullPtrLiteralExpr);
  REGISTER_MATCHER(nullStmt);
  REGISTER_MATCHER(ofClass);
  REGISTER_MATCHER(on);
  REGISTER_MATCHER(onImplicitObjectArgument);
  REGISTER_MATCHER(operatorCallExpr);
  REGISTER_MATCHER(parameterCountIs);
  REGISTER_MATCHER(parenType);
  REGISTER_MATCHER(pointee);
  REGISTER_MATCHER(pointerType);
  REGISTER_MATCHER(qualType);
  REGISTER_MATCHER(rValueReferenceType);
  REGISTER_MATCHER(recordDecl);
  REGISTER_MATCHER(recordType);
  REGISTER_MATCHER(referenceType);
  REGISTER_MATCHER(refersToDeclaration);
  REGISTER_MATCHER(refersToType);
  REGISTER_MATCHER(reinterpretCastExpr);
  REGISTER_MATCHER(returnStmt);
  REGISTER_MATCHER(returns);
  REGISTER_MATCHER(sizeOfExpr);
  REGISTER_MATCHER(specifiesNamespace);
  REGISTER_MATCHER(specifiesType);
  REGISTER_MATCHER(specifiesTypeLoc);
  REGISTER_MATCHER(statementCountIs);
  REGISTER_MATCHER(staticCastExpr);
  REGISTER_MATCHER(stmt);
  REGISTER_MATCHER(stringLiteral);
  REGISTER_MATCHER(switchCase);
  REGISTER_MATCHER(switchStmt);
  REGISTER_MATCHER(templateSpecializationType);
  REGISTER_MATCHER(thisExpr);
  REGISTER_MATCHER(throughUsingDecl);
  REGISTER_MATCHER(throwExpr);
  REGISTER_MATCHER(to);
  REGISTER_MATCHER(tryStmt);
  REGISTER_MATCHER(type);
  REGISTER_MATCHER(typeLoc);
  REGISTER_MATCHER(typedefType);
  REGISTER_MATCHER(unaryExprOrTypeTraitExpr);
  REGISTER_MATCHER(unaryOperator);
  REGISTER_MATCHER(userDefinedLiteral);
  REGISTER_MATCHER(usingDecl);
  REGISTER_MATCHER(varDecl);
  REGISTER_MATCHER(variableArrayType);
  REGISTER_MATCHER(whileStmt);
  REGISTER_MATCHER(withInitializer);
}

RegistryMaps::~RegistryMaps() {
  for (ConstructorMap::iterator it = Constructors.begin(),
                                end = Constructors.end();
       it != end; ++it) {
    delete it->second;
  }
}

static llvm::ManagedStatic<RegistryMaps> RegistryData;

} // anonymous namespace

// static
VariantMatcher Registry::constructMatcher(StringRef MatcherName,
                                          const SourceRange &NameRange,
                                          ArrayRef<ParserValue> Args,
                                          Diagnostics *Error) {
  ConstructorMap::const_iterator it =
      RegistryData->constructors().find(MatcherName);
  if (it == RegistryData->constructors().end()) {
    Error->addError(NameRange, Error->ET_RegistryNotFound) << MatcherName;
    return VariantMatcher();
  }

  return it->second->run(NameRange, Args, Error);
}

// static
VariantMatcher Registry::constructBoundMatcher(StringRef MatcherName,
                                               const SourceRange &NameRange,
                                               StringRef BindID,
                                               ArrayRef<ParserValue> Args,
                                               Diagnostics *Error) {
  VariantMatcher Out = constructMatcher(MatcherName, NameRange, Args, Error);
  if (Out.isNull()) return Out;

  const DynTypedMatcher *Result;
  if (Out.getSingleMatcher(Result)) {
    OwningPtr<DynTypedMatcher> Bound(Result->tryBind(BindID));
    if (Bound) {
      return VariantMatcher::SingleMatcher(*Bound);
    }
  }
  Error->addError(NameRange, Error->ET_RegistryNotBindable);
  return VariantMatcher();
}

}  // namespace dynamic
}  // namespace ast_matchers
}  // namespace clang