src/third_party/llvm-project/clang/include/clang/ASTMatchers/ASTMatchers.h

//===- ASTMatchers.h - Structural query framework ---------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//  This file implements matchers to be used together with the MatchFinder to
//  match AST nodes.
//
//  Matchers are created by generator functions, which can be combined in
//  a functional in-language DSL to express queries over the C++ AST.
//
//  For example, to match a class with a certain name, one would call:
//    cxxRecordDecl(hasName("MyClass"))
//  which returns a matcher that can be used to find all AST nodes that declare
//  a class named 'MyClass'.
//
//  For more complicated match expressions we're often interested in accessing
//  multiple parts of the matched AST nodes once a match is found. In that case,
//  use the id(...) matcher around the match expressions that match the nodes
//  you want to access.
//
//  For example, when we're interested in child classes of a certain class, we
//  would write:
//    cxxRecordDecl(hasName("MyClass"), has(id("child", recordDecl())))
//  When the match is found via the MatchFinder, a user provided callback will
//  be called with a BoundNodes instance that contains a mapping from the
//  strings that we provided for the id(...) calls to the nodes that were
//  matched.
//  In the given example, each time our matcher finds a match we get a callback
//  where "child" is bound to the RecordDecl node of the matching child
//  class declaration.
//
//  See ASTMatchersInternal.h for a more in-depth explanation of the
//  implementation details of the matcher framework.
//
//  See ASTMatchFinder.h for how to use the generated matchers to run over
//  an AST.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_ASTMATCHERS_ASTMATCHERS_H
#define LLVM_CLANG_ASTMATCHERS_ASTMATCHERS_H

#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTTypeTraits.h"
#include "clang/AST/Attr.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclFriend.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/Expr.h"
#include "clang/AST/ExprCXX.h"
#include "clang/AST/ExprObjC.h"
#include "clang/AST/NestedNameSpecifier.h"
#include "clang/AST/OperationKinds.h"
#include "clang/AST/Stmt.h"
#include "clang/AST/StmtCXX.h"
#include "clang/AST/StmtObjC.h"
#include "clang/AST/TemplateBase.h"
#include "clang/AST/TemplateName.h"
#include "clang/AST/Type.h"
#include "clang/AST/TypeLoc.h"
#include "clang/ASTMatchers/ASTMatchersInternal.h"
#include "clang/ASTMatchers/ASTMatchersMacros.h"
#include "clang/Basic/AttrKinds.h"
#include "clang/Basic/ExceptionSpecificationType.h"
#include "clang/Basic/IdentifierTable.h"
#include "clang/Basic/LLVM.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/Specifiers.h"
#include "clang/Basic/TypeTraits.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Regex.h"
#include <cassert>
#include <cstddef>
#include <iterator>
#include <limits>
#include <string>
#include <utility>
#include <vector>

namespace clang {
namespace ast_matchers {

/// Maps string IDs to AST nodes matched by parts of a matcher.
///
/// The bound nodes are generated by calling \c bind("id") on the node matchers
/// of the nodes we want to access later.
///
/// The instances of BoundNodes are created by \c MatchFinder when the user's
/// callbacks are executed every time a match is found.
class BoundNodes {
public:
  /// Returns the AST node bound to \c ID.
  ///
  /// Returns NULL if there was no node bound to \c ID or if there is a node but
  /// it cannot be converted to the specified type.
  template <typename T>
  const T *getNodeAs(StringRef ID) const {
    return MyBoundNodes.getNodeAs<T>(ID);
  }

  /// Type of mapping from binding identifiers to bound nodes. This type
  /// is an associative container with a key type of \c std::string and a value
  /// type of \c clang::ast_type_traits::DynTypedNode
  using IDToNodeMap = internal::BoundNodesMap::IDToNodeMap;

  /// Retrieve mapping from binding identifiers to bound nodes.
  const IDToNodeMap &getMap() const {
    return MyBoundNodes.getMap();
  }

private:
  friend class internal::BoundNodesTreeBuilder;

  /// Create BoundNodes from a pre-filled map of bindings.
  BoundNodes(internal::BoundNodesMap &MyBoundNodes)
      : MyBoundNodes(MyBoundNodes) {}

  internal::BoundNodesMap MyBoundNodes;
};

/// If the provided matcher matches a node, binds the node to \c ID.
///
/// FIXME: Do we want to support this now that we have bind()?
template <typename T>
internal::Matcher<T> id(StringRef ID,
                        const internal::BindableMatcher<T> &InnerMatcher) {
  return InnerMatcher.bind(ID);
}

/// Types of matchers for the top-level classes in the AST class
/// hierarchy.
/// @{
using DeclarationMatcher = internal::Matcher<Decl>;
using StatementMatcher = internal::Matcher<Stmt>;
using TypeMatcher = internal::Matcher<QualType>;
using TypeLocMatcher = internal::Matcher<TypeLoc>;
using NestedNameSpecifierMatcher = internal::Matcher<NestedNameSpecifier>;
using NestedNameSpecifierLocMatcher = internal::Matcher<NestedNameSpecifierLoc>;
using CXXCtorInitializerMatcher = internal::Matcher<CXXCtorInitializer>;
/// @}

/// Matches any node.
///
/// Useful when another matcher requires a child matcher, but there's no
/// additional constraint. This will often be used with an explicit conversion
/// to an \c internal::Matcher<> type such as \c TypeMatcher.
///
/// Example: \c DeclarationMatcher(anything()) matches all declarations, e.g.,
/// \code
/// "int* p" and "void f()" in
///   int* p;
///   void f();
/// \endcode
///
/// Usable as: Any Matcher
inline internal::TrueMatcher anything() { return internal::TrueMatcher(); }

/// Matches the top declaration context.
///
/// Given
/// \code
///   int X;
///   namespace NS {
///   int Y;
///   }  // namespace NS
/// \endcode
/// decl(hasDeclContext(translationUnitDecl()))
///   matches "int X", but not "int Y".
extern const internal::VariadicDynCastAllOfMatcher<Decl, TranslationUnitDecl>
    translationUnitDecl;

/// Matches typedef declarations.
///
/// Given
/// \code
///   typedef int X;
///   using Y = int;
/// \endcode
/// typedefDecl()
///   matches "typedef int X", but not "using Y = int"
extern const internal::VariadicDynCastAllOfMatcher<Decl, TypedefDecl>
    typedefDecl;

/// Matches typedef name declarations.
///
/// Given
/// \code
///   typedef int X;
///   using Y = int;
/// \endcode
/// typedefNameDecl()
///   matches "typedef int X" and "using Y = int"
extern const internal::VariadicDynCastAllOfMatcher<Decl, TypedefNameDecl>
    typedefNameDecl;

/// Matches type alias declarations.
///
/// Given
/// \code
///   typedef int X;
///   using Y = int;
/// \endcode
/// typeAliasDecl()
///   matches "using Y = int", but not "typedef int X"
extern const internal::VariadicDynCastAllOfMatcher<Decl, TypeAliasDecl>
    typeAliasDecl;

/// Matches type alias template declarations.
///
/// typeAliasTemplateDecl() matches
/// \code
///   template <typename T>
///   using Y = X<T>;
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, TypeAliasTemplateDecl>
    typeAliasTemplateDecl;

/// Matches AST nodes that were expanded within the main-file.
///
/// Example matches X but not Y
///   (matcher = cxxRecordDecl(isExpansionInMainFile())
/// \code
///   #include <Y.h>
///   class X {};
/// \endcode
/// Y.h:
/// \code
///   class Y {};
/// \endcode
///
/// Usable as: Matcher<Decl>, Matcher<Stmt>, Matcher<TypeLoc>
AST_POLYMORPHIC_MATCHER(isExpansionInMainFile,
                        AST_POLYMORPHIC_SUPPORTED_TYPES(Decl, Stmt, TypeLoc)) {
  auto &SourceManager = Finder->getASTContext().getSourceManager();
  return SourceManager.isInMainFile(
      SourceManager.getExpansionLoc(Node.getLocStart()));
}

/// Matches AST nodes that were expanded within system-header-files.
///
/// Example matches Y but not X
///     (matcher = cxxRecordDecl(isExpansionInSystemHeader())
/// \code
///   #include <SystemHeader.h>
///   class X {};
/// \endcode
/// SystemHeader.h:
/// \code
///   class Y {};
/// \endcode
///
/// Usable as: Matcher<Decl>, Matcher<Stmt>, Matcher<TypeLoc>
AST_POLYMORPHIC_MATCHER(isExpansionInSystemHeader,
                        AST_POLYMORPHIC_SUPPORTED_TYPES(Decl, Stmt, TypeLoc)) {
  auto &SourceManager = Finder->getASTContext().getSourceManager();
  auto ExpansionLoc = SourceManager.getExpansionLoc(Node.getLocStart());
  if (ExpansionLoc.isInvalid()) {
    return false;
  }
  return SourceManager.isInSystemHeader(ExpansionLoc);
}

/// Matches AST nodes that were expanded within files whose name is
/// partially matching a given regex.
///
/// Example matches Y but not X
///     (matcher = cxxRecordDecl(isExpansionInFileMatching("AST.*"))
/// \code
///   #include "ASTMatcher.h"
///   class X {};
/// \endcode
/// ASTMatcher.h:
/// \code
///   class Y {};
/// \endcode
///
/// Usable as: Matcher<Decl>, Matcher<Stmt>, Matcher<TypeLoc>
AST_POLYMORPHIC_MATCHER_P(isExpansionInFileMatching,
                          AST_POLYMORPHIC_SUPPORTED_TYPES(Decl, Stmt, TypeLoc),
                          std::string, RegExp) {
  auto &SourceManager = Finder->getASTContext().getSourceManager();
  auto ExpansionLoc = SourceManager.getExpansionLoc(Node.getLocStart());
  if (ExpansionLoc.isInvalid()) {
    return false;
  }
  auto FileEntry =
      SourceManager.getFileEntryForID(SourceManager.getFileID(ExpansionLoc));
  if (!FileEntry) {
    return false;
  }

  auto Filename = FileEntry->getName();
  llvm::Regex RE(RegExp);
  return RE.match(Filename);
}

/// Matches declarations.
///
/// Examples matches \c X, \c C, and the friend declaration inside \c C;
/// \code
///   void X();
///   class C {
///     friend X;
///   };
/// \endcode
extern const internal::VariadicAllOfMatcher<Decl> decl;

/// Matches a declaration of a linkage specification.
///
/// Given
/// \code
///   extern "C" {}
/// \endcode
/// linkageSpecDecl()
///   matches "extern "C" {}"
extern const internal::VariadicDynCastAllOfMatcher<Decl, LinkageSpecDecl>
    linkageSpecDecl;

/// Matches a declaration of anything that could have a name.
///
/// Example matches \c X, \c S, the anonymous union type, \c i, and \c U;
/// \code
///   typedef int X;
///   struct S {
///     union {
///       int i;
///     } U;
///   };
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, NamedDecl> namedDecl;

/// Matches a declaration of label.
///
/// Given
/// \code
///   goto FOO;
///   FOO: bar();
/// \endcode
/// labelDecl()
///   matches 'FOO:'
extern const internal::VariadicDynCastAllOfMatcher<Decl, LabelDecl> labelDecl;

/// Matches a declaration of a namespace.
///
/// Given
/// \code
///   namespace {}
///   namespace test {}
/// \endcode
/// namespaceDecl()
///   matches "namespace {}" and "namespace test {}"
extern const internal::VariadicDynCastAllOfMatcher<Decl, NamespaceDecl>
    namespaceDecl;

/// Matches a declaration of a namespace alias.
///
/// Given
/// \code
///   namespace test {}
///   namespace alias = ::test;
/// \endcode
/// namespaceAliasDecl()
///   matches "namespace alias" but not "namespace test"
extern const internal::VariadicDynCastAllOfMatcher<Decl, NamespaceAliasDecl>
    namespaceAliasDecl;

/// Matches class, struct, and union declarations.
///
/// Example matches \c X, \c Z, \c U, and \c S
/// \code
///   class X;
///   template<class T> class Z {};
///   struct S {};
///   union U {};
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, RecordDecl> recordDecl;

/// Matches C++ class declarations.
///
/// Example matches \c X, \c Z
/// \code
///   class X;
///   template<class T> class Z {};
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, CXXRecordDecl>
    cxxRecordDecl;

/// Matches C++ class template declarations.
///
/// Example matches \c Z
/// \code
///   template<class T> class Z {};
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, ClassTemplateDecl>
    classTemplateDecl;

/// Matches C++ class template specializations.
///
/// Given
/// \code
///   template<typename T> class A {};
///   template<> class A<double> {};
///   A<int> a;
/// \endcode
/// classTemplateSpecializationDecl()
///   matches the specializations \c A<int> and \c A<double>
extern const internal::VariadicDynCastAllOfMatcher<
    Decl, ClassTemplateSpecializationDecl>
    classTemplateSpecializationDecl;

/// Matches declarator declarations (field, variable, function
/// and non-type template parameter declarations).
///
/// Given
/// \code
///   class X { int y; };
/// \endcode
/// declaratorDecl()
///   matches \c int y.
extern const internal::VariadicDynCastAllOfMatcher<Decl, DeclaratorDecl>
    declaratorDecl;

/// Matches parameter variable declarations.
///
/// Given
/// \code
///   void f(int x);
/// \endcode
/// parmVarDecl()
///   matches \c int x.
extern const internal::VariadicDynCastAllOfMatcher<Decl, ParmVarDecl>
    parmVarDecl;

/// Matches C++ access specifier declarations.
///
/// Given
/// \code
///   class C {
///   public:
///     int a;
///   };
/// \endcode
/// accessSpecDecl()
///   matches 'public:'
extern const internal::VariadicDynCastAllOfMatcher<Decl, AccessSpecDecl>
    accessSpecDecl;

/// Matches constructor initializers.
///
/// Examples matches \c i(42).
/// \code
///   class C {
///     C() : i(42) {}
///     int i;
///   };
/// \endcode
extern const internal::VariadicAllOfMatcher<CXXCtorInitializer>
    cxxCtorInitializer;

/// Matches template arguments.
///
/// Given
/// \code
///   template <typename T> struct C {};
///   C<int> c;
/// \endcode
/// templateArgument()
///   matches 'int' in C<int>.
extern const internal::VariadicAllOfMatcher<TemplateArgument> templateArgument;

/// Matches template name.
///
/// Given
/// \code
///   template <typename T> class X { };
///   X<int> xi;
/// \endcode
/// templateName()
///   matches 'X' in X<int>.
extern const internal::VariadicAllOfMatcher<TemplateName> templateName;

/// Matches non-type template parameter declarations.
///
/// Given
/// \code
///   template <typename T, int N> struct C {};
/// \endcode
/// nonTypeTemplateParmDecl()
///   matches 'N', but not 'T'.
extern const internal::VariadicDynCastAllOfMatcher<Decl,
                                                   NonTypeTemplateParmDecl>
    nonTypeTemplateParmDecl;

/// Matches template type parameter declarations.
///
/// Given
/// \code
///   template <typename T, int N> struct C {};
/// \endcode
/// templateTypeParmDecl()
///   matches 'T', but not 'N'.
extern const internal::VariadicDynCastAllOfMatcher<Decl, TemplateTypeParmDecl>
    templateTypeParmDecl;

/// Matches public C++ declarations.
///
/// Given
/// \code
///   class C {
///   public:    int a;
///   protected: int b;
///   private:   int c;
///   };
/// \endcode
/// fieldDecl(isPublic())
///   matches 'int a;'
AST_MATCHER(Decl, isPublic) {
  return Node.getAccess() == AS_public;
}

/// Matches protected C++ declarations.
///
/// Given
/// \code
///   class C {
///   public:    int a;
///   protected: int b;
///   private:   int c;
///   };
/// \endcode
/// fieldDecl(isProtected())
///   matches 'int b;'
AST_MATCHER(Decl, isProtected) {
  return Node.getAccess() == AS_protected;
}

/// Matches private C++ declarations.
///
/// Given
/// \code
///   class C {
///   public:    int a;
///   protected: int b;
///   private:   int c;
///   };
/// \endcode
/// fieldDecl(isPrivate())
///   matches 'int c;'
AST_MATCHER(Decl, isPrivate) {
  return Node.getAccess() == AS_private;
}

/// Matches non-static data members that are bit-fields.
///
/// Given
/// \code
///   class C {
///     int a : 2;
///     int b;
///   };
/// \endcode
/// fieldDecl(isBitField())
///   matches 'int a;' but not 'int b;'.
AST_MATCHER(FieldDecl, isBitField) {
  return Node.isBitField();
}

/// Matches non-static data members that are bit-fields of the specified
/// bit width.
///
/// Given
/// \code
///   class C {
///     int a : 2;
///     int b : 4;
///     int c : 2;
///   };
/// \endcode
/// fieldDecl(hasBitWidth(2))
///   matches 'int a;' and 'int c;' but not 'int b;'.
AST_MATCHER_P(FieldDecl, hasBitWidth, unsigned, Width) {
  return Node.isBitField() &&
         Node.getBitWidthValue(Finder->getASTContext()) == Width;
}

/// Matches non-static data members that have an in-class initializer.
///
/// Given
/// \code
///   class C {
///     int a = 2;
///     int b = 3;
///     int c;
///   };
/// \endcode
/// fieldDecl(hasInClassInitializer(integerLiteral(equals(2))))
///   matches 'int a;' but not 'int b;'.
/// fieldDecl(hasInClassInitializer(anything()))
///   matches 'int a;' and 'int b;' but not 'int c;'.
AST_MATCHER_P(FieldDecl, hasInClassInitializer, internal::Matcher<Expr>,
              InnerMatcher) {
  const Expr *Initializer = Node.getInClassInitializer();
  return (Initializer != nullptr &&
          InnerMatcher.matches(*Initializer, Finder, Builder));
}

/// Determines whether the function is "main", which is the entry point
/// into an executable program.
AST_MATCHER(FunctionDecl, isMain) {
  return Node.isMain();
}

/// Matches the specialized template of a specialization declaration.
///
/// Given
/// \code
///   tempalate<typename T> class A {};
///   typedef A<int> B;
/// \endcode
/// classTemplateSpecializationDecl(hasSpecializedTemplate(classTemplateDecl()))
///   matches 'B' with classTemplateDecl() matching the class template
///   declaration of 'A'.
AST_MATCHER_P(ClassTemplateSpecializationDecl, hasSpecializedTemplate,
              internal::Matcher<ClassTemplateDecl>, InnerMatcher) {
  const ClassTemplateDecl* Decl = Node.getSpecializedTemplate();
  return (Decl != nullptr &&
          InnerMatcher.matches(*Decl, Finder, Builder));
}

/// Matches a declaration that has been implicitly added
/// by the compiler (eg. implicit default/copy constructors).
AST_MATCHER(Decl, isImplicit) {
  return Node.isImplicit();
}

/// Matches classTemplateSpecializations, templateSpecializationType and
/// functionDecl that have at least one TemplateArgument matching the given
/// InnerMatcher.
///
/// Given
/// \code
///   template<typename T> class A {};
///   template<> class A<double> {};
///   A<int> a;
///
///   template<typename T> f() {};
///   void func() { f<int>(); };
/// \endcode
///
/// \endcode
/// classTemplateSpecializationDecl(hasAnyTemplateArgument(
///     refersToType(asString("int"))))
///   matches the specialization \c A<int>
///
/// functionDecl(hasAnyTemplateArgument(refersToType(asString("int"))))
///   matches the specialization \c f<int>
AST_POLYMORPHIC_MATCHER_P(
    hasAnyTemplateArgument,
    AST_POLYMORPHIC_SUPPORTED_TYPES(ClassTemplateSpecializationDecl,
                                    TemplateSpecializationType,
                                    FunctionDecl),
    internal::Matcher<TemplateArgument>, InnerMatcher) {
  ArrayRef<TemplateArgument> List =
      internal::getTemplateSpecializationArgs(Node);
  return matchesFirstInRange(InnerMatcher, List.begin(), List.end(), Finder,
                             Builder);
}

/// Matches expressions that match InnerMatcher after any implicit AST
/// nodes are stripped off.
///
/// Parentheses and explicit casts are not discarded.
/// Given
/// \code
///   class C {};
///   C a = C();
///   C b;
///   C c = b;
/// \endcode
/// The matchers
/// \code
///    varDecl(hasInitializer(ignoringImplicit(cxxConstructExpr())))
/// \endcode
/// would match the declarations for a, b, and c.
/// While
/// \code
///    varDecl(hasInitializer(cxxConstructExpr()))
/// \endcode
/// only match the declarations for b and c.
AST_MATCHER_P(Expr, ignoringImplicit, internal::Matcher<Expr>,
              InnerMatcher) {
  return InnerMatcher.matches(*Node.IgnoreImplicit(), Finder, Builder);
}

/// Matches expressions that match InnerMatcher after any implicit casts
/// are stripped off.
///
/// Parentheses and explicit casts are not discarded.
/// Given
/// \code
///   int arr[5];
///   int a = 0;
///   char b = 0;
///   const int c = a;
///   int *d = arr;
///   long e = (long) 0l;
/// \endcode
/// The matchers
/// \code
///    varDecl(hasInitializer(ignoringImpCasts(integerLiteral())))
///    varDecl(hasInitializer(ignoringImpCasts(declRefExpr())))
/// \endcode
/// would match the declarations for a, b, c, and d, but not e.
/// While
/// \code
///    varDecl(hasInitializer(integerLiteral()))
///    varDecl(hasInitializer(declRefExpr()))
/// \endcode
/// only match the declarations for b, c, and d.
AST_MATCHER_P(Expr, ignoringImpCasts,
              internal::Matcher<Expr>, InnerMatcher) {
  return InnerMatcher.matches(*Node.IgnoreImpCasts(), Finder, Builder);
}

/// Matches expressions that match InnerMatcher after parentheses and
/// casts are stripped off.
///
/// Implicit and non-C Style casts are also discarded.
/// Given
/// \code
///   int a = 0;
///   char b = (0);
///   void* c = reinterpret_cast<char*>(0);
///   char d = char(0);
/// \endcode
/// The matcher
///    varDecl(hasInitializer(ignoringParenCasts(integerLiteral())))
/// would match the declarations for a, b, c, and d.
/// while
///    varDecl(hasInitializer(integerLiteral()))
/// only match the declaration for a.
AST_MATCHER_P(Expr, ignoringParenCasts, internal::Matcher<Expr>, InnerMatcher) {
  return InnerMatcher.matches(*Node.IgnoreParenCasts(), Finder, Builder);
}

/// Matches expressions that match InnerMatcher after implicit casts and
/// parentheses are stripped off.
///
/// Explicit casts are not discarded.
/// Given
/// \code
///   int arr[5];
///   int a = 0;
///   char b = (0);
///   const int c = a;
///   int *d = (arr);
///   long e = ((long) 0l);
/// \endcode
/// The matchers
///    varDecl(hasInitializer(ignoringParenImpCasts(integerLiteral())))
///    varDecl(hasInitializer(ignoringParenImpCasts(declRefExpr())))
/// would match the declarations for a, b, c, and d, but not e.
/// while
///    varDecl(hasInitializer(integerLiteral()))
///    varDecl(hasInitializer(declRefExpr()))
/// would only match the declaration for a.
AST_MATCHER_P(Expr, ignoringParenImpCasts,
              internal::Matcher<Expr>, InnerMatcher) {
  return InnerMatcher.matches(*Node.IgnoreParenImpCasts(), Finder, Builder);
}

/// Matches types that match InnerMatcher after any parens are stripped.
///
/// Given
/// \code
///   void (*fp)(void);
/// \endcode
/// The matcher
/// \code
///   varDecl(hasType(pointerType(pointee(ignoringParens(functionType())))))
/// \endcode
/// would match the declaration for fp.
AST_MATCHER_P(QualType, ignoringParens,
              internal::Matcher<QualType>, InnerMatcher) {
  return InnerMatcher.matches(Node.IgnoreParens(), Finder, Builder);
}

/// Matches classTemplateSpecializations, templateSpecializationType and
/// functionDecl where the n'th TemplateArgument matches the given InnerMatcher.
///
/// Given
/// \code
///   template<typename T, typename U> class A {};
///   A<bool, int> b;
///   A<int, bool> c;
///
///   template<typename T> void f() {}
///   void func() { f<int>(); };
/// \endcode
/// classTemplateSpecializationDecl(hasTemplateArgument(
///     1, refersToType(asString("int"))))
///   matches the specialization \c A<bool, int>
///
/// functionDecl(hasTemplateArgument(0, refersToType(asString("int"))))
///   matches the specialization \c f<int>
AST_POLYMORPHIC_MATCHER_P2(
    hasTemplateArgument,
    AST_POLYMORPHIC_SUPPORTED_TYPES(ClassTemplateSpecializationDecl,
                                    TemplateSpecializationType,
                                    FunctionDecl),
    unsigned, N, internal::Matcher<TemplateArgument>, InnerMatcher) {
  ArrayRef<TemplateArgument> List =
      internal::getTemplateSpecializationArgs(Node);
  if (List.size() <= N)
    return false;
  return InnerMatcher.matches(List[N], Finder, Builder);
}

/// Matches if the number of template arguments equals \p N.
///
/// Given
/// \code
///   template<typename T> struct C {};
///   C<int> c;
/// \endcode
/// classTemplateSpecializationDecl(templateArgumentCountIs(1))
///   matches C<int>.
AST_POLYMORPHIC_MATCHER_P(
    templateArgumentCountIs,
    AST_POLYMORPHIC_SUPPORTED_TYPES(ClassTemplateSpecializationDecl,
                                    TemplateSpecializationType),
    unsigned, N) {
  return internal::getTemplateSpecializationArgs(Node).size() == N;
}

/// Matches a TemplateArgument that refers to a certain type.
///
/// Given
/// \code
///   struct X {};
///   template<typename T> struct A {};
///   A<X> a;
/// \endcode
/// classTemplateSpecializationDecl(hasAnyTemplateArgument(
///     refersToType(class(hasName("X")))))
///   matches the specialization \c A<X>
AST_MATCHER_P(TemplateArgument, refersToType,
              internal::Matcher<QualType>, InnerMatcher) {
  if (Node.getKind() != TemplateArgument::Type)
    return false;
  return InnerMatcher.matches(Node.getAsType(), Finder, Builder);
}

/// Matches a TemplateArgument that refers to a certain template.
///
/// Given
/// \code
///   template<template <typename> class S> class X {};
///   template<typename T> class Y {};"
///   X<Y> xi;
/// \endcode
/// classTemplateSpecializationDecl(hasAnyTemplateArgument(
///     refersToTemplate(templateName())))
///   matches the specialization \c X<Y>
AST_MATCHER_P(TemplateArgument, refersToTemplate,
              internal::Matcher<TemplateName>, InnerMatcher) {
  if (Node.getKind() != TemplateArgument::Template)
    return false;
  return InnerMatcher.matches(Node.getAsTemplate(), Finder, Builder);
}

/// Matches a canonical TemplateArgument that refers to a certain
/// declaration.
///
/// Given
/// \code
///   struct B { int next; };
///   template<int(B::*next_ptr)> struct A {};
///   A<&B::next> a;
/// \endcode
/// classTemplateSpecializationDecl(hasAnyTemplateArgument(
///     refersToDeclaration(fieldDecl(hasName("next")))))
///   matches the specialization \c A<&B::next> with \c fieldDecl(...) matching
///     \c B::next
AST_MATCHER_P(TemplateArgument, refersToDeclaration,
              internal::Matcher<Decl>, InnerMatcher) {
  if (Node.getKind() == TemplateArgument::Declaration)
    return InnerMatcher.matches(*Node.getAsDecl(), Finder, Builder);
  return false;
}

/// Matches a sugar TemplateArgument that refers to a certain expression.
///
/// Given
/// \code
///   struct B { int next; };
///   template<int(B::*next_ptr)> struct A {};
///   A<&B::next> a;
/// \endcode
/// templateSpecializationType(hasAnyTemplateArgument(
///   isExpr(hasDescendant(declRefExpr(to(fieldDecl(hasName("next"))))))))
///   matches the specialization \c A<&B::next> with \c fieldDecl(...) matching
///     \c B::next
AST_MATCHER_P(TemplateArgument, isExpr, internal::Matcher<Expr>, InnerMatcher) {
  if (Node.getKind() == TemplateArgument::Expression)
    return InnerMatcher.matches(*Node.getAsExpr(), Finder, Builder);
  return false;
}

/// Matches a TemplateArgument that is an integral value.
///
/// Given
/// \code
///   template<int T> struct C {};
///   C<42> c;
/// \endcode
/// classTemplateSpecializationDecl(
///   hasAnyTemplateArgument(isIntegral()))
///   matches the implicit instantiation of C in C<42>
///   with isIntegral() matching 42.
AST_MATCHER(TemplateArgument, isIntegral) {
  return Node.getKind() == TemplateArgument::Integral;
}

/// Matches a TemplateArgument that referes to an integral type.
///
/// Given
/// \code
///   template<int T> struct C {};
///   C<42> c;
/// \endcode
/// classTemplateSpecializationDecl(
///   hasAnyTemplateArgument(refersToIntegralType(asString("int"))))
///   matches the implicit instantiation of C in C<42>.
AST_MATCHER_P(TemplateArgument, refersToIntegralType,
              internal::Matcher<QualType>, InnerMatcher) {
  if (Node.getKind() != TemplateArgument::Integral)
    return false;
  return InnerMatcher.matches(Node.getIntegralType(), Finder, Builder);
}

/// Matches a TemplateArgument of integral type with a given value.
///
/// Note that 'Value' is a string as the template argument's value is
/// an arbitrary precision integer. 'Value' must be euqal to the canonical
/// representation of that integral value in base 10.
///
/// Given
/// \code
///   template<int T> struct C {};
///   C<42> c;
/// \endcode
/// classTemplateSpecializationDecl(
///   hasAnyTemplateArgument(equalsIntegralValue("42")))
///   matches the implicit instantiation of C in C<42>.
AST_MATCHER_P(TemplateArgument, equalsIntegralValue,
              std::string, Value) {
  if (Node.getKind() != TemplateArgument::Integral)
    return false;
  return Node.getAsIntegral().toString(10) == Value;
}

/// Matches an Objective-C autorelease pool statement.
///
/// Given
/// \code
///   @autoreleasepool {
///     int x = 0;
///   }
/// \endcode
/// autoreleasePoolStmt(stmt()) matches the declaration of "x"
/// inside the autorelease pool.
extern const internal::VariadicDynCastAllOfMatcher<Stmt,
       ObjCAutoreleasePoolStmt> autoreleasePoolStmt;

/// Matches any value declaration.
///
/// Example matches A, B, C and F
/// \code
///   enum X { A, B, C };
///   void F();
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, ValueDecl> valueDecl;

/// Matches C++ constructor declarations.
///
/// Example matches Foo::Foo() and Foo::Foo(int)
/// \code
///   class Foo {
///    public:
///     Foo();
///     Foo(int);
///     int DoSomething();
///   };
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, CXXConstructorDecl>
    cxxConstructorDecl;

/// Matches explicit C++ destructor declarations.
///
/// Example matches Foo::~Foo()
/// \code
///   class Foo {
///    public:
///     virtual ~Foo();
///   };
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, CXXDestructorDecl>
    cxxDestructorDecl;

/// Matches enum declarations.
///
/// Example matches X
/// \code
///   enum X {
///     A, B, C
///   };
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, EnumDecl> enumDecl;

/// Matches enum constants.
///
/// Example matches A, B, C
/// \code
///   enum X {
///     A, B, C
///   };
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, EnumConstantDecl>
    enumConstantDecl;

/// Matches method declarations.
///
/// Example matches y
/// \code
///   class X { void y(); };
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, CXXMethodDecl>
    cxxMethodDecl;

/// Matches conversion operator declarations.
///
/// Example matches the operator.
/// \code
///   class X { operator int() const; };
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, CXXConversionDecl>
    cxxConversionDecl;

/// Matches variable declarations.
///
/// Note: this does not match declarations of member variables, which are
/// "field" declarations in Clang parlance.
///
/// Example matches a
/// \code
///   int a;
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, VarDecl> varDecl;

/// Matches field declarations.
///
/// Given
/// \code
///   class X { int m; };
/// \endcode
/// fieldDecl()
///   matches 'm'.
extern const internal::VariadicDynCastAllOfMatcher<Decl, FieldDecl> fieldDecl;

/// Matches function declarations.
///
/// Example matches f
/// \code
///   void f();
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, FunctionDecl>
    functionDecl;

/// Matches C++ function template declarations.
///
/// Example matches f
/// \code
///   template<class T> void f(T t) {}
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, FunctionTemplateDecl>
    functionTemplateDecl;

/// Matches friend declarations.
///
/// Given
/// \code
///   class X { friend void foo(); };
/// \endcode
/// friendDecl()
///   matches 'friend void foo()'.
extern const internal::VariadicDynCastAllOfMatcher<Decl, FriendDecl> friendDecl;

/// Matches statements.
///
/// Given
/// \code
///   { ++a; }
/// \endcode
/// stmt()
///   matches both the compound statement '{ ++a; }' and '++a'.
extern const internal::VariadicAllOfMatcher<Stmt> stmt;

/// Matches declaration statements.
///
/// Given
/// \code
///   int a;
/// \endcode
/// declStmt()
///   matches 'int a'.
extern const internal::VariadicDynCastAllOfMatcher<Stmt, DeclStmt> declStmt;

/// Matches member expressions.
///
/// Given
/// \code
///   class Y {
///     void x() { this->x(); x(); Y y; y.x(); a; this->b; Y::b; }
///     int a; static int b;
///   };
/// \endcode
/// memberExpr()
///   matches this->x, x, y.x, a, this->b
extern const internal::VariadicDynCastAllOfMatcher<Stmt, MemberExpr> memberExpr;

/// Matches call expressions.
///
/// Example matches x.y() and y()
/// \code
///   X x;
///   x.y();
///   y();
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CallExpr> callExpr;

/// Matches lambda expressions.
///
/// Example matches [&](){return 5;}
/// \code
///   [&](){return 5;}
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, LambdaExpr> lambdaExpr;

/// Matches member call expressions.
///
/// Example matches x.y()
/// \code
///   X x;
///   x.y();
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CXXMemberCallExpr>
    cxxMemberCallExpr;

/// Matches ObjectiveC Message invocation expressions.
///
/// The innermost message send invokes the "alloc" class method on the
/// NSString class, while the outermost message send invokes the
/// "initWithString" instance method on the object returned from
/// NSString's "alloc". This matcher should match both message sends.
/// \code
///   [[NSString alloc] initWithString:@"Hello"]
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, ObjCMessageExpr>
    objcMessageExpr;

/// Matches Objective-C interface declarations.
///
/// Example matches Foo
/// \code
///   @interface Foo
///   @end
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, ObjCInterfaceDecl>
    objcInterfaceDecl;

/// Matches Objective-C implementation declarations.
///
/// Example matches Foo
/// \code
///   @implementation Foo
///   @end
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, ObjCImplementationDecl>
    objcImplementationDecl;

/// Matches Objective-C protocol declarations.
///
/// Example matches FooDelegate
/// \code
///   @protocol FooDelegate
///   @end
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, ObjCProtocolDecl>
    objcProtocolDecl;

/// Matches Objective-C category declarations.
///
/// Example matches Foo (Additions)
/// \code
///   @interface Foo (Additions)
///   @end
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, ObjCCategoryDecl>
    objcCategoryDecl;

/// Matches Objective-C category definitions.
///
/// Example matches Foo (Additions)
/// \code
///   @implementation Foo (Additions)
///   @end
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, ObjCCategoryImplDecl>
    objcCategoryImplDecl;

/// Matches Objective-C method declarations.
///
/// Example matches both declaration and definition of -[Foo method]
/// \code
///   @interface Foo
///   - (void)method;
///   @end
///
///   @implementation Foo
///   - (void)method {}
///   @end
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, ObjCMethodDecl>
    objcMethodDecl;

/// Matches block declarations.
///
/// Example matches the declaration of the nameless block printing an input
/// integer.
///
/// \code
///   myFunc(^(int p) {
///     printf("%d", p);
///   })
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, BlockDecl>
    blockDecl;

/// Matches Objective-C instance variable declarations.
///
/// Example matches _enabled
/// \code
///   @implementation Foo {
///     BOOL _enabled;
///   }
///   @end
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, ObjCIvarDecl>
    objcIvarDecl;

/// Matches Objective-C property declarations.
///
/// Example matches enabled
/// \code
///   @interface Foo
///   @property BOOL enabled;
///   @end
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, ObjCPropertyDecl>
    objcPropertyDecl;

/// Matches Objective-C \@throw statements.
///
/// Example matches \@throw
/// \code
///   @throw obj;
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, ObjCAtThrowStmt>
    objcThrowStmt;

/// Matches Objective-C @try statements.
///
/// Example matches @try
/// \code
///   @try {}
///   @catch (...) {}
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, ObjCAtTryStmt>
    objcTryStmt;

/// Matches Objective-C @catch statements.
///
/// Example matches @catch
/// \code
///   @try {}
///   @catch (...) {}
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, ObjCAtCatchStmt>
    objcCatchStmt;

/// Matches Objective-C @finally statements.
///
/// Example matches @finally
/// \code
///   @try {}
///   @finally {}
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, ObjCAtFinallyStmt>
    objcFinallyStmt;

/// Matches expressions that introduce cleanups to be run at the end
/// of the sub-expression's evaluation.
///
/// Example matches std::string()
/// \code
///   const std::string str = std::string();
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, ExprWithCleanups>
    exprWithCleanups;

/// Matches init list expressions.
///
/// Given
/// \code
///   int a[] = { 1, 2 };
///   struct B { int x, y; };
///   B b = { 5, 6 };
/// \endcode
/// initListExpr()
///   matches "{ 1, 2 }" and "{ 5, 6 }"
extern const internal::VariadicDynCastAllOfMatcher<Stmt, InitListExpr>
    initListExpr;

/// Matches the syntactic form of init list expressions
/// (if expression have it).
AST_MATCHER_P(InitListExpr, hasSyntacticForm,
              internal::Matcher<Expr>, InnerMatcher) {
  const Expr *SyntForm = Node.getSyntacticForm();
  return (SyntForm != nullptr &&
          InnerMatcher.matches(*SyntForm, Finder, Builder));
}

/// Matches C++ initializer list expressions.
///
/// Given
/// \code
///   std::vector<int> a({ 1, 2, 3 });
///   std::vector<int> b = { 4, 5 };
///   int c[] = { 6, 7 };
///   std::pair<int, int> d = { 8, 9 };
/// \endcode
/// cxxStdInitializerListExpr()
///   matches "{ 1, 2, 3 }" and "{ 4, 5 }"
extern const internal::VariadicDynCastAllOfMatcher<Stmt,
                                                   CXXStdInitializerListExpr>
    cxxStdInitializerListExpr;

/// Matches implicit initializers of init list expressions.
///
/// Given
/// \code
///   point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 };
/// \endcode
/// implicitValueInitExpr()
///   matches "[0].y" (implicitly)
extern const internal::VariadicDynCastAllOfMatcher<Stmt, ImplicitValueInitExpr>
    implicitValueInitExpr;

/// Matches paren list expressions.
/// ParenListExprs don't have a predefined type and are used for late parsing.
/// In the final AST, they can be met in template declarations.
///
/// Given
/// \code
///   template<typename T> class X {
///     void f() {
///       X x(*this);
///       int a = 0, b = 1; int i = (a, b);
///     }
///   };
/// \endcode
/// parenListExpr() matches "*this" but NOT matches (a, b) because (a, b)
/// has a predefined type and is a ParenExpr, not a ParenListExpr.
extern const internal::VariadicDynCastAllOfMatcher<Stmt, ParenListExpr>
    parenListExpr;

/// Matches substitutions of non-type template parameters.
///
/// Given
/// \code
///   template <int N>
///   struct A { static const int n = N; };
///   struct B : public A<42> {};
/// \endcode
/// substNonTypeTemplateParmExpr()
///   matches "N" in the right-hand side of "static const int n = N;"
extern const internal::VariadicDynCastAllOfMatcher<Stmt,
                                                   SubstNonTypeTemplateParmExpr>
    substNonTypeTemplateParmExpr;

/// Matches using declarations.
///
/// Given
/// \code
///   namespace X { int x; }
///   using X::x;
/// \endcode
/// usingDecl()
///   matches \code using X::x \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, UsingDecl> usingDecl;

/// Matches using namespace declarations.
///
/// Given
/// \code
///   namespace X { int x; }
///   using namespace X;
/// \endcode
/// usingDirectiveDecl()
///   matches \code using namespace X \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, UsingDirectiveDecl>
    usingDirectiveDecl;

/// Matches reference to a name that can be looked up during parsing
/// but could not be resolved to a specific declaration.
///
/// Given
/// \code
///   template<typename T>
///   T foo() { T a; return a; }
///   template<typename T>
///   void bar() {
///     foo<T>();
///   }
/// \endcode
/// unresolvedLookupExpr()
///   matches \code foo<T>() \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, UnresolvedLookupExpr>
    unresolvedLookupExpr;

/// Matches unresolved using value declarations.
///
/// Given
/// \code
///   template<typename X>
///   class C : private X {
///     using X::x;
///   };
/// \endcode
/// unresolvedUsingValueDecl()
///   matches \code using X::x \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl,
                                                   UnresolvedUsingValueDecl>
    unresolvedUsingValueDecl;

/// Matches unresolved using value declarations that involve the
/// typename.
///
/// Given
/// \code
///   template <typename T>
///   struct Base { typedef T Foo; };
///
///   template<typename T>
///   struct S : private Base<T> {
///     using typename Base<T>::Foo;
///   };
/// \endcode
/// unresolvedUsingTypenameDecl()
///   matches \code using Base<T>::Foo \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl,
                                                   UnresolvedUsingTypenameDecl>
    unresolvedUsingTypenameDecl;

/// Matches parentheses used in expressions.
///
/// Example matches (foo() + 1)
/// \code
///   int foo() { return 1; }
///   int a = (foo() + 1);
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, ParenExpr> parenExpr;

/// Matches constructor call expressions (including implicit ones).
///
/// Example matches string(ptr, n) and ptr within arguments of f
///     (matcher = cxxConstructExpr())
/// \code
///   void f(const string &a, const string &b);
///   char *ptr;
///   int n;
///   f(string(ptr, n), ptr);
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CXXConstructExpr>
    cxxConstructExpr;

/// Matches unresolved constructor call expressions.
///
/// Example matches T(t) in return statement of f
///     (matcher = cxxUnresolvedConstructExpr())
/// \code
///   template <typename T>
///   void f(const T& t) { return T(t); }
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt,
                                                   CXXUnresolvedConstructExpr>
    cxxUnresolvedConstructExpr;

/// Matches implicit and explicit this expressions.
///
/// Example matches the implicit this expression in "return i".
///     (matcher = cxxThisExpr())
/// \code
/// struct foo {
///   int i;
///   int f() { return i; }
/// };
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CXXThisExpr>
    cxxThisExpr;

/// Matches nodes where temporaries are created.
///
/// Example matches FunctionTakesString(GetStringByValue())
///     (matcher = cxxBindTemporaryExpr())
/// \code
///   FunctionTakesString(GetStringByValue());
///   FunctionTakesStringByPointer(GetStringPointer());
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CXXBindTemporaryExpr>
    cxxBindTemporaryExpr;

/// Matches nodes where temporaries are materialized.
///
/// Example: Given
/// \code
///   struct T {void func();};
///   T f();
///   void g(T);
/// \endcode
/// materializeTemporaryExpr() matches 'f()' in these statements
/// \code
///   T u(f());
///   g(f());
///   f().func();
/// \endcode
/// but does not match
/// \code
///   f();
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt,
                                                   MaterializeTemporaryExpr>
    materializeTemporaryExpr;

/// Matches new expressions.
///
/// Given
/// \code
///   new X;
/// \endcode
/// cxxNewExpr()
///   matches 'new X'.
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CXXNewExpr> cxxNewExpr;

/// Matches delete expressions.
///
/// Given
/// \code
///   delete X;
/// \endcode
/// cxxDeleteExpr()
///   matches 'delete X'.
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CXXDeleteExpr>
    cxxDeleteExpr;

/// Matches array subscript expressions.
///
/// Given
/// \code
///   int i = a[1];
/// \endcode
/// arraySubscriptExpr()
///   matches "a[1]"
extern const internal::VariadicDynCastAllOfMatcher<Stmt, ArraySubscriptExpr>
    arraySubscriptExpr;

/// Matches the value of a default argument at the call site.
///
/// Example matches the CXXDefaultArgExpr placeholder inserted for the
///     default value of the second parameter in the call expression f(42)
///     (matcher = cxxDefaultArgExpr())
/// \code
///   void f(int x, int y = 0);
///   f(42);
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CXXDefaultArgExpr>
    cxxDefaultArgExpr;

/// Matches overloaded operator calls.
///
/// Note that if an operator isn't overloaded, it won't match. Instead, use
/// binaryOperator matcher.
/// Currently it does not match operators such as new delete.
/// FIXME: figure out why these do not match?
///
/// Example matches both operator<<((o << b), c) and operator<<(o, b)
///     (matcher = cxxOperatorCallExpr())
/// \code
///   ostream &operator<< (ostream &out, int i) { };
///   ostream &o; int b = 1, c = 1;
///   o << b << c;
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CXXOperatorCallExpr>
    cxxOperatorCallExpr;

/// Matches expressions.
///
/// Example matches x()
/// \code
///   void f() { x(); }
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, Expr> expr;

/// Matches expressions that refer to declarations.
///
/// Example matches x in if (x)
/// \code
///   bool x;
///   if (x) {}
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, DeclRefExpr>
    declRefExpr;

/// Matches a reference to an ObjCIvar.
///
/// Example: matches "a" in "init" method:
/// \code
/// @implementation A {
///   NSString *a;
/// }
/// - (void) init {
///   a = @"hello";
/// }
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, ObjCIvarRefExpr>
    objcIvarRefExpr;

/// Matches if statements.
///
/// Example matches 'if (x) {}'
/// \code
///   if (x) {}
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, IfStmt> ifStmt;

/// Matches for statements.
///
/// Example matches 'for (;;) {}'
/// \code
///   for (;;) {}
///   int i[] =  {1, 2, 3}; for (auto a : i);
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, ForStmt> forStmt;

/// Matches the increment statement of a for loop.
///
/// Example:
///     forStmt(hasIncrement(unaryOperator(hasOperatorName("++"))))
/// matches '++x' in
/// \code
///     for (x; x < N; ++x) { }
/// \endcode
AST_MATCHER_P(ForStmt, hasIncrement, internal::Matcher<Stmt>,
              InnerMatcher) {
  const Stmt *const Increment = Node.getInc();
  return (Increment != nullptr &&
          InnerMatcher.matches(*Increment, Finder, Builder));
}

/// Matches the initialization statement of a for loop.
///
/// Example:
///     forStmt(hasLoopInit(declStmt()))
/// matches 'int x = 0' in
/// \code
///     for (int x = 0; x < N; ++x) { }
/// \endcode
AST_MATCHER_P(ForStmt, hasLoopInit, internal::Matcher<Stmt>,
              InnerMatcher) {
  const Stmt *const Init = Node.getInit();
  return (Init != nullptr && InnerMatcher.matches(*Init, Finder, Builder));
}

/// Matches range-based for statements.
///
/// cxxForRangeStmt() matches 'for (auto a : i)'
/// \code
///   int i[] =  {1, 2, 3}; for (auto a : i);
///   for(int j = 0; j < 5; ++j);
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CXXForRangeStmt>
    cxxForRangeStmt;

/// Matches the initialization statement of a for loop.
///
/// Example:
///     forStmt(hasLoopVariable(anything()))
/// matches 'int x' in
/// \code
///     for (int x : a) { }
/// \endcode
AST_MATCHER_P(CXXForRangeStmt, hasLoopVariable, internal::Matcher<VarDecl>,
              InnerMatcher) {
  const VarDecl *const Var = Node.getLoopVariable();
  return (Var != nullptr && InnerMatcher.matches(*Var, Finder, Builder));
}

/// Matches the range initialization statement of a for loop.
///
/// Example:
///     forStmt(hasRangeInit(anything()))
/// matches 'a' in
/// \code
///     for (int x : a) { }
/// \endcode
AST_MATCHER_P(CXXForRangeStmt, hasRangeInit, internal::Matcher<Expr>,
              InnerMatcher) {
  const Expr *const Init = Node.getRangeInit();
  return (Init != nullptr && InnerMatcher.matches(*Init, Finder, Builder));
}

/// Matches while statements.
///
/// Given
/// \code
///   while (true) {}
/// \endcode
/// whileStmt()
///   matches 'while (true) {}'.
extern const internal::VariadicDynCastAllOfMatcher<Stmt, WhileStmt> whileStmt;

/// Matches do statements.
///
/// Given
/// \code
///   do {} while (true);
/// \endcode
/// doStmt()
///   matches 'do {} while(true)'
extern const internal::VariadicDynCastAllOfMatcher<Stmt, DoStmt> doStmt;

/// Matches break statements.
///
/// Given
/// \code
///   while (true) { break; }
/// \endcode
/// breakStmt()
///   matches 'break'
extern const internal::VariadicDynCastAllOfMatcher<Stmt, BreakStmt> breakStmt;

/// Matches continue statements.
///
/// Given
/// \code
///   while (true) { continue; }
/// \endcode
/// continueStmt()
///   matches 'continue'
extern const internal::VariadicDynCastAllOfMatcher<Stmt, ContinueStmt>
    continueStmt;

/// Matches return statements.
///
/// Given
/// \code
///   return 1;
/// \endcode
/// returnStmt()
///   matches 'return 1'
extern const internal::VariadicDynCastAllOfMatcher<Stmt, ReturnStmt> returnStmt;

/// Matches goto statements.
///
/// Given
/// \code
///   goto FOO;
///   FOO: bar();
/// \endcode
/// gotoStmt()
///   matches 'goto FOO'
extern const internal::VariadicDynCastAllOfMatcher<Stmt, GotoStmt> gotoStmt;

/// Matches label statements.
///
/// Given
/// \code
///   goto FOO;
///   FOO: bar();
/// \endcode
/// labelStmt()
///   matches 'FOO:'
extern const internal::VariadicDynCastAllOfMatcher<Stmt, LabelStmt> labelStmt;

/// Matches address of label statements (GNU extension).
///
/// Given
/// \code
///   FOO: bar();
///   void *ptr = &&FOO;
///   goto *bar;
/// \endcode
/// addrLabelExpr()
///   matches '&&FOO'
extern const internal::VariadicDynCastAllOfMatcher<Stmt, AddrLabelExpr>
    addrLabelExpr;

/// Matches switch statements.
///
/// Given
/// \code
///   switch(a) { case 42: break; default: break; }
/// \endcode
/// switchStmt()
///   matches 'switch(a)'.
extern const internal::VariadicDynCastAllOfMatcher<Stmt, SwitchStmt> switchStmt;

/// Matches case and default statements inside switch statements.
///
/// Given
/// \code
///   switch(a) { case 42: break; default: break; }
/// \endcode
/// switchCase()
///   matches 'case 42:' and 'default:'.
extern const internal::VariadicDynCastAllOfMatcher<Stmt, SwitchCase> switchCase;

/// Matches case statements inside switch statements.
///
/// Given
/// \code
///   switch(a) { case 42: break; default: break; }
/// \endcode
/// caseStmt()
///   matches 'case 42:'.
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CaseStmt> caseStmt;

/// Matches default statements inside switch statements.
///
/// Given
/// \code
///   switch(a) { case 42: break; default: break; }
/// \endcode
/// defaultStmt()
///   matches 'default:'.
extern const internal::VariadicDynCastAllOfMatcher<Stmt, DefaultStmt>
    defaultStmt;

/// Matches compound statements.
///
/// Example matches '{}' and '{{}}' in 'for (;;) {{}}'
/// \code
///   for (;;) {{}}
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CompoundStmt>
    compoundStmt;

/// Matches catch statements.
///
/// \code
///   try {} catch(int i) {}
/// \endcode
/// cxxCatchStmt()
///   matches 'catch(int i)'
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CXXCatchStmt>
    cxxCatchStmt;

/// Matches try statements.
///
/// \code
///   try {} catch(int i) {}
/// \endcode
/// cxxTryStmt()
///   matches 'try {}'
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CXXTryStmt> cxxTryStmt;

/// Matches throw expressions.
///
/// \code
///   try { throw 5; } catch(int i) {}
/// \endcode
/// cxxThrowExpr()
///   matches 'throw 5'
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CXXThrowExpr>
    cxxThrowExpr;

/// Matches null statements.
///
/// \code
///   foo();;
/// \endcode
/// nullStmt()
///   matches the second ';'
extern const internal::VariadicDynCastAllOfMatcher<Stmt, NullStmt> nullStmt;

/// Matches asm statements.
///
/// \code
///  int i = 100;
///   __asm("mov al, 2");
/// \endcode
/// asmStmt()
///   matches '__asm("mov al, 2")'
extern const internal::VariadicDynCastAllOfMatcher<Stmt, AsmStmt> asmStmt;

/// Matches bool literals.
///
/// Example matches true
/// \code
///   true
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CXXBoolLiteralExpr>
    cxxBoolLiteral;

/// Matches string literals (also matches wide string literals).
///
/// Example matches "abcd", L"abcd"
/// \code
///   char *s = "abcd";
///   wchar_t *ws = L"abcd";
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, StringLiteral>
    stringLiteral;

/// Matches character literals (also matches wchar_t).
///
/// Not matching Hex-encoded chars (e.g. 0x1234, which is a IntegerLiteral),
/// though.
///
/// Example matches 'a', L'a'
/// \code
///   char ch = 'a';
///   wchar_t chw = L'a';
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CharacterLiteral>
    characterLiteral;

/// Matches integer literals of all sizes / encodings, e.g.
/// 1, 1L, 0x1 and 1U.
///
/// Does not match character-encoded integers such as L'a'.
extern const internal::VariadicDynCastAllOfMatcher<Stmt, IntegerLiteral>
    integerLiteral;

/// Matches float literals of all sizes / encodings, e.g.
/// 1.0, 1.0f, 1.0L and 1e10.
///
/// Does not match implicit conversions such as
/// \code
///   float a = 10;
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, FloatingLiteral>
    floatLiteral;

/// Matches user defined literal operator call.
///
/// Example match: "foo"_suffix
extern const internal::VariadicDynCastAllOfMatcher<Stmt, UserDefinedLiteral>
    userDefinedLiteral;

/// Matches compound (i.e. non-scalar) literals
///
/// Example match: {1}, (1, 2)
/// \code
///   int array[4] = {1};
///   vector int myvec = (vector int)(1, 2);
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CompoundLiteralExpr>
    compoundLiteralExpr;

/// Matches nullptr literal.
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CXXNullPtrLiteralExpr>
    cxxNullPtrLiteralExpr;

/// Matches GNU __null expression.
extern const internal::VariadicDynCastAllOfMatcher<Stmt, GNUNullExpr>
    gnuNullExpr;

/// Matches atomic builtins.
/// Example matches __atomic_load_n(ptr, 1)
/// \code
///   void foo() { int *ptr; __atomic_load_n(ptr, 1); }
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, AtomicExpr> atomicExpr;

/// Matches statement expression (GNU extension).
///
/// Example match: ({ int X = 4; X; })
/// \code
///   int C = ({ int X = 4; X; });
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, StmtExpr> stmtExpr;

/// Matches binary operator expressions.
///
/// Example matches a || b
/// \code
///   !(a || b)
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, BinaryOperator>
    binaryOperator;

/// Matches unary operator expressions.
///
/// Example matches !a
/// \code
///   !a || b
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, UnaryOperator>
    unaryOperator;

/// Matches conditional operator expressions.
///
/// Example matches a ? b : c
/// \code
///   (a ? b : c) + 42
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, ConditionalOperator>
    conditionalOperator;

/// Matches binary conditional operator expressions (GNU extension).
///
/// Example matches a ?: b
/// \code
///   (a ?: b) + 42;
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt,
                                                   BinaryConditionalOperator>
    binaryConditionalOperator;

/// Matches opaque value expressions. They are used as helpers
/// to reference another expressions and can be met
/// in BinaryConditionalOperators, for example.
///
/// Example matches 'a'
/// \code
///   (a ?: c) + 42;
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, OpaqueValueExpr>
    opaqueValueExpr;

/// Matches a C++ static_assert declaration.
///
/// Example:
///   staticAssertExpr()
/// matches
///   static_assert(sizeof(S) == sizeof(int))
/// in
/// \code
///   struct S {
///     int x;
///   };
///   static_assert(sizeof(S) == sizeof(int));
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Decl, StaticAssertDecl>
    staticAssertDecl;

/// Matches a reinterpret_cast expression.
///
/// Either the source expression or the destination type can be matched
/// using has(), but hasDestinationType() is more specific and can be
/// more readable.
///
/// Example matches reinterpret_cast<char*>(&p) in
/// \code
///   void* p = reinterpret_cast<char*>(&p);
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CXXReinterpretCastExpr>
    cxxReinterpretCastExpr;

/// Matches a C++ static_cast expression.
///
/// \see hasDestinationType
/// \see reinterpretCast
///
/// Example:
///   cxxStaticCastExpr()
/// matches
///   static_cast<long>(8)
/// in
/// \code
///   long eight(static_cast<long>(8));
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CXXStaticCastExpr>
    cxxStaticCastExpr;

/// Matches a dynamic_cast expression.
///
/// Example:
///   cxxDynamicCastExpr()
/// matches
///   dynamic_cast<D*>(&b);
/// in
/// \code
///   struct B { virtual ~B() {} }; struct D : B {};
///   B b;
///   D* p = dynamic_cast<D*>(&b);
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CXXDynamicCastExpr>
    cxxDynamicCastExpr;

/// Matches a const_cast expression.
///
/// Example: Matches const_cast<int*>(&r) in
/// \code
///   int n = 42;
///   const int &r(n);
///   int* p = const_cast<int*>(&r);
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CXXConstCastExpr>
    cxxConstCastExpr;

/// Matches a C-style cast expression.
///
/// Example: Matches (int) 2.2f in
/// \code
///   int i = (int) 2.2f;
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CStyleCastExpr>
    cStyleCastExpr;

/// Matches explicit cast expressions.
///
/// Matches any cast expression written in user code, whether it be a
/// C-style cast, a functional-style cast, or a keyword cast.
///
/// Does not match implicit conversions.
///
/// Note: the name "explicitCast" is chosen to match Clang's terminology, as
/// Clang uses the term "cast" to apply to implicit conversions as well as to
/// actual cast expressions.
///
/// \see hasDestinationType.
///
/// Example: matches all five of the casts in
/// \code
///   int((int)(reinterpret_cast<int>(static_cast<int>(const_cast<int>(42)))))
/// \endcode
/// but does not match the implicit conversion in
/// \code
///   long ell = 42;
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, ExplicitCastExpr>
    explicitCastExpr;

/// Matches the implicit cast nodes of Clang's AST.
///
/// This matches many different places, including function call return value
/// eliding, as well as any type conversions.
extern const internal::VariadicDynCastAllOfMatcher<Stmt, ImplicitCastExpr>
    implicitCastExpr;

/// Matches any cast nodes of Clang's AST.
///
/// Example: castExpr() matches each of the following:
/// \code
///   (int) 3;
///   const_cast<Expr *>(SubExpr);
///   char c = 0;
/// \endcode
/// but does not match
/// \code
///   int i = (0);
///   int k = 0;
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CastExpr> castExpr;

/// Matches functional cast expressions
///
/// Example: Matches Foo(bar);
/// \code
///   Foo f = bar;
///   Foo g = (Foo) bar;
///   Foo h = Foo(bar);
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CXXFunctionalCastExpr>
    cxxFunctionalCastExpr;

/// Matches functional cast expressions having N != 1 arguments
///
/// Example: Matches Foo(bar, bar)
/// \code
///   Foo h = Foo(bar, bar);
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CXXTemporaryObjectExpr>
    cxxTemporaryObjectExpr;

/// Matches predefined identifier expressions [C99 6.4.2.2].
///
/// Example: Matches __func__
/// \code
///   printf("%s", __func__);
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, PredefinedExpr>
    predefinedExpr;

/// Matches C99 designated initializer expressions [C99 6.7.8].
///
/// Example: Matches { [2].y = 1.0, [0].x = 1.0 }
/// \code
///   point ptarray[10] = { [2].y = 1.0, [0].x = 1.0 };
/// \endcode
extern const internal::VariadicDynCastAllOfMatcher<Stmt, DesignatedInitExpr>
    designatedInitExpr;

/// Matches designated initializer expressions that contain
/// a specific number of designators.
///
/// Example: Given
/// \code
///   point ptarray[10] = { [2].y = 1.0, [0].x = 1.0 };
///   point ptarray2[10] = { [2].y = 1.0, [2].x = 0.0, [0].x = 1.0 };
/// \endcode
/// designatorCountIs(2)
///   matches '{ [2].y = 1.0, [0].x = 1.0 }',
///   but not '{ [2].y = 1.0, [2].x = 0.0, [0].x = 1.0 }'.
AST_MATCHER_P(DesignatedInitExpr, designatorCountIs, unsigned, N) {
  return Node.size() == N;
}

/// Matches \c QualTypes in the clang AST.
extern const internal::VariadicAllOfMatcher<QualType> qualType;

/// Matches \c Types in the clang AST.
extern const internal::VariadicAllOfMatcher<Type> type;

/// Matches \c TypeLocs in the clang AST.
extern const internal::VariadicAllOfMatcher<TypeLoc> typeLoc;

/// Matches if any of the given matchers matches.
///
/// Unlike \c anyOf, \c eachOf will generate a match result for each
/// matching submatcher.
///
/// For example, in:
/// \code
///   class A { int a; int b; };
/// \endcode
/// The matcher:
/// \code
///   cxxRecordDecl(eachOf(has(fieldDecl(hasName("a")).bind("v")),
///                        has(fieldDecl(hasName("b")).bind("v"))))
/// \endcode
/// will generate two results binding "v", the first of which binds
/// the field declaration of \c a, the second the field declaration of
/// \c b.
///
/// Usable as: Any Matcher
extern const internal::VariadicOperatorMatcherFunc<
    2, std::numeric_limits<unsigned>::max()>
    eachOf;

/// Matches if any of the given matchers matches.
///
/// Usable as: Any Matcher
extern const internal::VariadicOperatorMatcherFunc<
    2, std::numeric_limits<unsigned>::max()>
    anyOf;

/// Matches if all given matchers match.
///
/// Usable as: Any Matcher
extern const internal::VariadicOperatorMatcherFunc<
    2, std::numeric_limits<unsigned>::max()>
    allOf;

/// Matches sizeof (C99), alignof (C++11) and vec_step (OpenCL)
///
/// Given
/// \code
///   Foo x = bar;
///   int y = sizeof(x) + alignof(x);
/// \endcode
/// unaryExprOrTypeTraitExpr()
///   matches \c sizeof(x) and \c alignof(x)
extern const internal::VariadicDynCastAllOfMatcher<Stmt,
                                                   UnaryExprOrTypeTraitExpr>
    unaryExprOrTypeTraitExpr;

/// Matches unary expressions that have a specific type of argument.
///
/// Given
/// \code
///   int a, c; float b; int s = sizeof(a) + sizeof(b) + alignof(c);
/// \endcode
/// unaryExprOrTypeTraitExpr(hasArgumentOfType(asString("int"))
///   matches \c sizeof(a) and \c alignof(c)
AST_MATCHER_P(UnaryExprOrTypeTraitExpr, hasArgumentOfType,
              internal::Matcher<QualType>, InnerMatcher) {
  const QualType ArgumentType = Node.getTypeOfArgument();
  return InnerMatcher.matches(ArgumentType, Finder, Builder);
}

/// Matches unary expressions of a certain kind.
///
/// Given
/// \code
///   int x;
///   int s = sizeof(x) + alignof(x)
/// \endcode
/// unaryExprOrTypeTraitExpr(ofKind(UETT_SizeOf))
///   matches \c sizeof(x)
AST_MATCHER_P(UnaryExprOrTypeTraitExpr, ofKind, UnaryExprOrTypeTrait, Kind) {
  return Node.getKind() == Kind;
}

/// Same as unaryExprOrTypeTraitExpr, but only matching
/// alignof.
inline internal::Matcher<Stmt> alignOfExpr(
    const internal::Matcher<UnaryExprOrTypeTraitExpr> &InnerMatcher) {
  return stmt(unaryExprOrTypeTraitExpr(allOf(
      ofKind(UETT_AlignOf), InnerMatcher)));
}

/// Same as unaryExprOrTypeTraitExpr, but only matching
/// sizeof.
inline internal::Matcher<Stmt> sizeOfExpr(
    const internal::Matcher<UnaryExprOrTypeTraitExpr> &InnerMatcher) {
  return stmt(unaryExprOrTypeTraitExpr(
      allOf(ofKind(UETT_SizeOf), InnerMatcher)));
}

/// Matches NamedDecl nodes that have the specified name.
///
/// Supports specifying enclosing namespaces or classes by prefixing the name
/// with '<enclosing>::'.
/// Does not match typedefs of an underlying type with the given name.
///
/// Example matches X (Name == "X")
/// \code
///   class X;
/// \endcode
///
/// Example matches X (Name is one of "::a::b::X", "a::b::X", "b::X", "X")
/// \code
///   namespace a { namespace b { class X; } }
/// \endcode
inline internal::Matcher<NamedDecl> hasName(const std::string &Name) {
  return internal::Matcher<NamedDecl>(new internal::HasNameMatcher({Name}));
}

/// Matches NamedDecl nodes that have any of the specified names.
///
/// This matcher is only provided as a performance optimization of hasName.
/// \code
///     hasAnyName(a, b, c)
/// \endcode
///  is equivalent to, but faster than
/// \code
///     anyOf(hasName(a), hasName(b), hasName(c))
/// \endcode
extern const internal::VariadicFunction<internal::Matcher<NamedDecl>, StringRef,
                                        internal::hasAnyNameFunc>
    hasAnyName;

/// Matches NamedDecl nodes whose fully qualified names contain
/// a substring matched by the given RegExp.
///
/// Supports specifying enclosing namespaces or classes by
/// prefixing the name with '<enclosing>::'.  Does not match typedefs
/// of an underlying type with the given name.
///
/// Example matches X (regexp == "::X")
/// \code
///   class X;
/// \endcode
///
/// Example matches X (regexp is one of "::X", "^foo::.*X", among others)
/// \code
///   namespace foo { namespace bar { class X; } }
/// \endcode
AST_MATCHER_P(NamedDecl, matchesName, std::string, RegExp) {
  assert(!RegExp.empty());
  std::string FullNameString = "::" + Node.getQualifiedNameAsString();
  llvm::Regex RE(RegExp);
  return RE.match(FullNameString);
}

/// Matches overloaded operator names.
///
/// Matches overloaded operator names specified in strings without the
/// "operator" prefix: e.g. "<<".
///
/// Given:
/// \code
///   class A { int operator*(); };
///   const A &operator<<(const A &a, const A &b);
///   A a;
///   a << a;   // <-- This matches
/// \endcode
///
/// \c cxxOperatorCallExpr(hasOverloadedOperatorName("<<"))) matches the
/// specified line and
/// \c cxxRecordDecl(hasMethod(hasOverloadedOperatorName("*")))
/// matches the declaration of \c A.
///
/// Usable as: Matcher<CXXOperatorCallExpr>, Matcher<FunctionDecl>
inline internal::PolymorphicMatcherWithParam1<
    internal::HasOverloadedOperatorNameMatcher, StringRef,
    AST_POLYMORPHIC_SUPPORTED_TYPES(CXXOperatorCallExpr, FunctionDecl)>
hasOverloadedOperatorName(StringRef Name) {
  return internal::PolymorphicMatcherWithParam1<
      internal::HasOverloadedOperatorNameMatcher, StringRef,
      AST_POLYMORPHIC_SUPPORTED_TYPES(CXXOperatorCallExpr, FunctionDecl)>(Name);
}

/// Matches C++ classes that are directly or indirectly derived from
/// a class matching \c Base.
///
/// Note that a class is not considered to be derived from itself.
///
/// Example matches Y, Z, C (Base == hasName("X"))
/// \code
///   class X;
///   class Y : public X {};  // directly derived
///   class Z : public Y {};  // indirectly derived
///   typedef X A;
///   typedef A B;
///   class C : public B {};  // derived from a typedef of X
/// \endcode
///
/// In the following example, Bar matches isDerivedFrom(hasName("X")):
/// \code
///   class Foo;
///   typedef Foo X;
///   class Bar : public Foo {};  // derived from a type that X is a typedef of
/// \endcode
AST_MATCHER_P(CXXRecordDecl, isDerivedFrom,
              internal::Matcher<NamedDecl>, Base) {
  return Finder->classIsDerivedFrom(&Node, Base, Builder);
}

/// Overloaded method as shortcut for \c isDerivedFrom(hasName(...)).
AST_MATCHER_P_OVERLOAD(CXXRecordDecl, isDerivedFrom, std::string, BaseName, 1) {
  assert(!BaseName.empty());
  return isDerivedFrom(hasName(BaseName)).matches(Node, Finder, Builder);
}

/// Similar to \c isDerivedFrom(), but also matches classes that directly
/// match \c Base.
AST_MATCHER_P_OVERLOAD(CXXRecordDecl, isSameOrDerivedFrom,
                       internal::Matcher<NamedDecl>, Base, 0) {
  return Matcher<CXXRecordDecl>(anyOf(Base, isDerivedFrom(Base)))
      .matches(Node, Finder, Builder);
}

/// Overloaded method as shortcut for
/// \c isSameOrDerivedFrom(hasName(...)).
AST_MATCHER_P_OVERLOAD(CXXRecordDecl, isSameOrDerivedFrom, std::string,
                       BaseName, 1) {
  assert(!BaseName.empty());
  return isSameOrDerivedFrom(hasName(BaseName)).matches(Node, Finder, Builder);
}

/// Matches the first method of a class or struct that satisfies \c
/// InnerMatcher.
///
/// Given:
/// \code
///   class A { void func(); };
///   class B { void member(); };
/// \endcode
///
/// \c cxxRecordDecl(hasMethod(hasName("func"))) matches the declaration of
/// \c A but not \c B.
AST_MATCHER_P(CXXRecordDecl, hasMethod, internal::Matcher<CXXMethodDecl>,
              InnerMatcher) {
  return matchesFirstInPointerRange(InnerMatcher, Node.method_begin(),
                                    Node.method_end(), Finder, Builder);
}

/// Matches the generated class of lambda expressions.
///
/// Given:
/// \code
///   auto x = []{};
/// \endcode
///
/// \c cxxRecordDecl(isLambda()) matches the implicit class declaration of
/// \c decltype(x)
AST_MATCHER(CXXRecordDecl, isLambda) {
  return Node.isLambda();
}

/// Matches AST nodes that have child AST nodes that match the
/// provided matcher.
///
/// Example matches X, Y
///   (matcher = cxxRecordDecl(has(cxxRecordDecl(hasName("X")))
/// \code
///   class X {};  // Matches X, because X::X is a class of name X inside X.
///   class Y { class X {}; };
///   class Z { class Y { class X {}; }; };  // Does not match Z.
/// \endcode
///
/// ChildT must be an AST base type.
///
/// Usable as: Any Matcher
/// Note that has is direct matcher, so it also matches things like implicit
/// casts and paren casts. If you are matching with expr then you should
/// probably consider using ignoringParenImpCasts like:
/// has(ignoringParenImpCasts(expr())).
extern const internal::ArgumentAdaptingMatcherFunc<internal::HasMatcher> has;

/// Matches AST nodes that have descendant AST nodes that match the
/// provided matcher.
///
/// Example matches X, Y, Z
///     (matcher = cxxRecordDecl(hasDescendant(cxxRecordDecl(hasName("X")))))
/// \code
///   class X {};  // Matches X, because X::X is a class of name X inside X.
///   class Y { class X {}; };
///   class Z { class Y { class X {}; }; };
/// \endcode
///
/// DescendantT must be an AST base type.
///
/// Usable as: Any Matcher
extern const internal::ArgumentAdaptingMatcherFunc<
    internal::HasDescendantMatcher>
    hasDescendant;

/// Matches AST nodes that have child AST nodes that match the
/// provided matcher.
///
/// Example matches X, Y, Y::X, Z::Y, Z::Y::X
///   (matcher = cxxRecordDecl(forEach(cxxRecordDecl(hasName("X")))
/// \code
///   class X {};
///   class Y { class X {}; };  // Matches Y, because Y::X is a class of name X
///                             // inside Y.
///   class Z { class Y { class X {}; }; };  // Does not match Z.
/// \endcode
///
/// ChildT must be an AST base type.
///
/// As opposed to 'has', 'forEach' will cause a match for each result that
/// matches instead of only on the first one.
///
/// Usable as: Any Matcher
extern const internal::ArgumentAdaptingMatcherFunc<internal::ForEachMatcher>
    forEach;

/// Matches AST nodes that have descendant AST nodes that match the
/// provided matcher.
///
/// Example matches X, A, A::X, B, B::C, B::C::X
///   (matcher = cxxRecordDecl(forEachDescendant(cxxRecordDecl(hasName("X")))))
/// \code
///   class X {};
///   class A { class X {}; };  // Matches A, because A::X is a class of name
///                             // X inside A.
///   class B { class C { class X {}; }; };
/// \endcode
///
/// DescendantT must be an AST base type.
///
/// As opposed to 'hasDescendant', 'forEachDescendant' will cause a match for
/// each result that matches instead of only on the first one.
///
/// Note: Recursively combined ForEachDescendant can cause many matches:
///   cxxRecordDecl(forEachDescendant(cxxRecordDecl(
///     forEachDescendant(cxxRecordDecl())
///   )))
/// will match 10 times (plus injected class name matches) on:
/// \code
///   class A { class B { class C { class D { class E {}; }; }; }; };
/// \endcode
///
/// Usable as: Any Matcher
extern const internal::ArgumentAdaptingMatcherFunc<
    internal::ForEachDescendantMatcher>
    forEachDescendant;

/// Matches if the node or any descendant matches.
///
/// Generates results for each match.
///
/// For example, in:
/// \code
///   class A { class B {}; class C {}; };
/// \endcode
/// The matcher:
/// \code
///   cxxRecordDecl(hasName("::A"),
///                 findAll(cxxRecordDecl(isDefinition()).bind("m")))
/// \endcode
/// will generate results for \c A, \c B and \c C.
///
/// Usable as: Any Matcher
template <typename T>
internal::Matcher<T> findAll(const internal::Matcher<T> &Matcher) {
  return eachOf(Matcher, forEachDescendant(Matcher));
}

/// Matches AST nodes that have a parent that matches the provided
/// matcher.
///
/// Given
/// \code
/// void f() { for (;;) { int x = 42; if (true) { int x = 43; } } }
/// \endcode
/// \c compoundStmt(hasParent(ifStmt())) matches "{ int x = 43; }".
///
/// Usable as: Any Matcher
extern const internal::ArgumentAdaptingMatcherFunc<
    internal::HasParentMatcher,
    internal::TypeList<Decl, NestedNameSpecifierLoc, Stmt, TypeLoc>,
    internal::TypeList<Decl, NestedNameSpecifierLoc, Stmt, TypeLoc>>
    hasParent;

/// Matches AST nodes that have an ancestor that matches the provided
/// matcher.
///
/// Given
/// \code
/// void f() { if (true) { int x = 42; } }
/// void g() { for (;;) { int x = 43; } }
/// \endcode
/// \c expr(integerLiteral(hasAncestor(ifStmt()))) matches \c 42, but not 43.
///
/// Usable as: Any Matcher
extern const internal::ArgumentAdaptingMatcherFunc<
    internal::HasAncestorMatcher,
    internal::TypeList<Decl, NestedNameSpecifierLoc, Stmt, TypeLoc>,
    internal::TypeList<Decl, NestedNameSpecifierLoc, Stmt, TypeLoc>>
    hasAncestor;

/// Matches if the provided matcher does not match.
///
/// Example matches Y (matcher = cxxRecordDecl(unless(hasName("X"))))
/// \code
///   class X {};
///   class Y {};
/// \endcode
///
/// Usable as: Any Matcher
extern const internal::VariadicOperatorMatcherFunc<1, 1> unless;

/// Matches a node if the declaration associated with that node
/// matches the given matcher.
///
/// The associated declaration is:
/// - for type nodes, the declaration of the underlying type
/// - for CallExpr, the declaration of the callee
/// - for MemberExpr, the declaration of the referenced member
/// - for CXXConstructExpr, the declaration of the constructor
/// - for CXXNewExpr, the declaration of the operator new
/// - for ObjCIvarExpr, the declaration of the ivar
///
/// For type nodes, hasDeclaration will generally match the declaration of the
/// sugared type. Given
/// \code
///   class X {};
///   typedef X Y;
///   Y y;
/// \endcode
/// in varDecl(hasType(hasDeclaration(decl()))) the decl will match the
/// typedefDecl. A common use case is to match the underlying, desugared type.
/// This can be achieved by using the hasUnqualifiedDesugaredType matcher:
/// \code
///   varDecl(hasType(hasUnqualifiedDesugaredType(
///       recordType(hasDeclaration(decl())))))
/// \endcode
/// In this matcher, the decl will match the CXXRecordDecl of class X.
///
/// Usable as: Matcher<AddrLabelExpr>, Matcher<CallExpr>,
///   Matcher<CXXConstructExpr>, Matcher<CXXNewExpr>, Matcher<DeclRefExpr>,
///   Matcher<EnumType>, Matcher<InjectedClassNameType>, Matcher<LabelStmt>,
///   Matcher<MemberExpr>, Matcher<QualType>, Matcher<RecordType>,
///   Matcher<TagType>, Matcher<TemplateSpecializationType>,
///   Matcher<TemplateTypeParmType>, Matcher<TypedefType>,
///   Matcher<UnresolvedUsingType>
inline internal::PolymorphicMatcherWithParam1<
    internal::HasDeclarationMatcher, internal::Matcher<Decl>,
    void(internal::HasDeclarationSupportedTypes)>
hasDeclaration(const internal::Matcher<Decl> &InnerMatcher) {
  return internal::PolymorphicMatcherWithParam1<
      internal::HasDeclarationMatcher, internal::Matcher<Decl>,
      void(internal::HasDeclarationSupportedTypes)>(InnerMatcher);
}

/// Matches a \c NamedDecl whose underlying declaration matches the given
/// matcher.
///
/// Given
/// \code
///   namespace N { template<class T> void f(T t); }
///   template <class T> void g() { using N::f; f(T()); }
/// \endcode
/// \c unresolvedLookupExpr(hasAnyDeclaration(
///     namedDecl(hasUnderlyingDecl(hasName("::N::f")))))
///   matches the use of \c f in \c g() .
AST_MATCHER_P(NamedDecl, hasUnderlyingDecl, internal::Matcher<NamedDecl>,
              InnerMatcher) {
  const NamedDecl *UnderlyingDecl = Node.getUnderlyingDecl();

  return UnderlyingDecl != nullptr &&
         InnerMatcher.matches(*UnderlyingDecl, Finder, Builder);
}

/// Matches on the implicit object argument of a member call expression.
///
/// Example matches y.x()
///   (matcher = cxxMemberCallExpr(on(hasType(cxxRecordDecl(hasName("Y"))))))
/// \code
///   class Y { public: void x(); };
///   void z() { Y y; y.x(); }
/// \endcode
///
/// FIXME: Overload to allow directly matching types?
AST_MATCHER_P(CXXMemberCallExpr, on, internal::Matcher<Expr>,
              InnerMatcher) {
  const Expr *ExprNode = Node.getImplicitObjectArgument()
                            ->IgnoreParenImpCasts();
  return (ExprNode != nullptr &&
          InnerMatcher.matches(*ExprNode, Finder, Builder));
}


/// Matches on the receiver of an ObjectiveC Message expression.
///
/// Example
/// matcher = objCMessageExpr(hasReceiverType(asString("UIWebView *")));
/// matches the [webView ...] message invocation.
/// \code
///   NSString *webViewJavaScript = ...
///   UIWebView *webView = ...
///   [webView stringByEvaluatingJavaScriptFromString:webViewJavascript];
/// \endcode
AST_MATCHER_P(ObjCMessageExpr, hasReceiverType, internal::Matcher<QualType>,
              InnerMatcher) {
  const QualType TypeDecl = Node.getReceiverType();
  return InnerMatcher.matches(TypeDecl, Finder, Builder);
}

/// Returns true when the Objective-C message is sent to an instance.
///
/// Example
/// matcher = objcMessagaeExpr(isInstanceMessage())
/// matches
/// \code
///   NSString *x = @"hello";
///   [x containsString:@"h"];
/// \endcode
/// but not
/// \code
///   [NSString stringWithFormat:@"format"];
/// \endcode
AST_MATCHER(ObjCMessageExpr, isInstanceMessage) {
  return Node.isInstanceMessage();
}

/// Matches if the Objective-C message is sent to an instance,
/// and the inner matcher matches on that instance.
///
/// For example the method call in
/// \code
///   NSString *x = @"hello";
///   [x containsString:@"h"];
/// \endcode
/// is matched by
/// objcMessageExpr(hasReceiver(declRefExpr(to(varDecl(hasName("x"))))))
AST_MATCHER_P(ObjCMessageExpr, hasReceiver, internal::Matcher<Expr>,
              InnerMatcher) {
  const Expr *ReceiverNode = Node.getInstanceReceiver();
  return (ReceiverNode != nullptr &&
          InnerMatcher.matches(*ReceiverNode->IgnoreParenImpCasts(), Finder,
                               Builder));
}

/// Matches when BaseName == Selector.getAsString()
///
///  matcher = objCMessageExpr(hasSelector("loadHTMLString:baseURL:"));
///  matches the outer message expr in the code below, but NOT the message
///  invocation for self.bodyView.
/// \code
///     [self.bodyView loadHTMLString:html baseURL:NULL];
/// \endcode
AST_MATCHER_P(ObjCMessageExpr, hasSelector, std::string, BaseName) {
  Selector Sel = Node.getSelector();
  return BaseName.compare(Sel.getAsString()) == 0;
}


/// Matches when at least one of the supplied string equals to the
/// Selector.getAsString()
///
///  matcher = objCMessageExpr(hasSelector("methodA:", "methodB:"));
///  matches both of the expressions below:
/// \code
///     [myObj methodA:argA];
///     [myObj methodB:argB];
/// \endcode
extern const internal::VariadicFunction<internal::Matcher<ObjCMessageExpr>,
                                        StringRef,
                                        internal::hasAnySelectorFunc>
                                        hasAnySelector;

/// Matches ObjC selectors whose name contains
/// a substring matched by the given RegExp.
///  matcher = objCMessageExpr(matchesSelector("loadHTMLString\:baseURL?"));
///  matches the outer message expr in the code below, but NOT the message
///  invocation for self.bodyView.
/// \code
///     [self.bodyView loadHTMLString:html baseURL:NULL];
/// \endcode
AST_MATCHER_P(ObjCMessageExpr, matchesSelector, std::string, RegExp) {
  assert(!RegExp.empty());
  std::string SelectorString = Node.getSelector().getAsString();
  llvm::Regex RE(RegExp);
  return RE.match(SelectorString);
}

/// Matches when the selector is the empty selector
///
/// Matches only when the selector of the objCMessageExpr is NULL. This may
/// represent an error condition in the tree!
AST_MATCHER(ObjCMessageExpr, hasNullSelector) {
  return Node.getSelector().isNull();
}

/// Matches when the selector is a Unary Selector
///
///  matcher = objCMessageExpr(matchesSelector(hasUnarySelector());
///  matches self.bodyView in the code below, but NOT the outer message
///  invocation of "loadHTMLString:baseURL:".
/// \code
///     [self.bodyView loadHTMLString:html baseURL:NULL];
/// \endcode
AST_MATCHER(ObjCMessageExpr, hasUnarySelector) {
  return Node.getSelector().isUnarySelector();
}

/// Matches when the selector is a keyword selector
///
/// objCMessageExpr(hasKeywordSelector()) matches the generated setFrame
/// message expression in
///
/// \code
///   UIWebView *webView = ...;
///   CGRect bodyFrame = webView.frame;
///   bodyFrame.size.height = self.bodyContentHeight;
///   webView.frame = bodyFrame;
///   //     ^---- matches here
/// \endcode
AST_MATCHER(ObjCMessageExpr, hasKeywordSelector) {
  return Node.getSelector().isKeywordSelector();
}

/// Matches when the selector has the specified number of arguments
///
///  matcher = objCMessageExpr(numSelectorArgs(0));
///  matches self.bodyView in the code below
///
///  matcher = objCMessageExpr(numSelectorArgs(2));
///  matches the invocation of "loadHTMLString:baseURL:" but not that
///  of self.bodyView
/// \code
///     [self.bodyView loadHTMLString:html baseURL:NULL];
/// \endcode
AST_MATCHER_P(ObjCMessageExpr, numSelectorArgs, unsigned, N) {
  return Node.getSelector().getNumArgs() == N;
}

/// Matches if the call expression's callee expression matches.
///
/// Given
/// \code
///   class Y { void x() { this->x(); x(); Y y; y.x(); } };
///   void f() { f(); }
/// \endcode
/// callExpr(callee(expr()))
///   matches this->x(), x(), y.x(), f()
/// with callee(...)
///   matching this->x, x, y.x, f respectively
///
/// Note: Callee cannot take the more general internal::Matcher<Expr>
/// because this introduces ambiguous overloads with calls to Callee taking a
/// internal::Matcher<Decl>, as the matcher hierarchy is purely
/// implemented in terms of implicit casts.
AST_MATCHER_P(CallExpr, callee, internal::Matcher<Stmt>,
              InnerMatcher) {
  const Expr *ExprNode = Node.getCallee();
  return (ExprNode != nullptr &&
          InnerMatcher.matches(*ExprNode, Finder, Builder));
}

/// Matches if the call expression's callee's declaration matches the
/// given matcher.
///
/// Example matches y.x() (matcher = callExpr(callee(
///                                    cxxMethodDecl(hasName("x")))))
/// \code
///   class Y { public: void x(); };
///   void z() { Y y; y.x(); }
/// \endcode
AST_MATCHER_P_OVERLOAD(CallExpr, callee, internal::Matcher<Decl>, InnerMatcher,
                       1) {
  return callExpr(hasDeclaration(InnerMatcher)).matches(Node, Finder, Builder);
}

/// Matches if the expression's or declaration's type matches a type
/// matcher.
///
/// Example matches x (matcher = expr(hasType(cxxRecordDecl(hasName("X")))))
///             and z (matcher = varDecl(hasType(cxxRecordDecl(hasName("X")))))
///             and U (matcher = typedefDecl(hasType(asString("int")))
///             and friend class X (matcher = friendDecl(hasType("X"))
/// \code
///  class X {};
///  void y(X &x) { x; X z; }
///  typedef int U;
///  class Y { friend class X; };
/// \endcode
AST_POLYMORPHIC_MATCHER_P_OVERLOAD(
    hasType,
    AST_POLYMORPHIC_SUPPORTED_TYPES(Expr, FriendDecl, TypedefNameDecl,
                                    ValueDecl),
    internal::Matcher<QualType>, InnerMatcher, 0) {
  QualType QT = internal::getUnderlyingType(Node);
  if (!QT.isNull())
    return InnerMatcher.matches(QT, Finder, Builder);
  return false;
}

/// Overloaded to match the declaration of the expression's or value
/// declaration's type.
///
/// In case of a value declaration (for example a variable declaration),
/// this resolves one layer of indirection. For example, in the value
/// declaration "X x;", cxxRecordDecl(hasName("X")) matches the declaration of
/// X, while varDecl(hasType(cxxRecordDecl(hasName("X")))) matches the
/// declaration of x.
///
/// Example matches x (matcher = expr(hasType(cxxRecordDecl(hasName("X")))))
///             and z (matcher = varDecl(hasType(cxxRecordDecl(hasName("X")))))
///             and friend class X (matcher = friendDecl(hasType("X"))
/// \code
///  class X {};
///  void y(X &x) { x; X z; }
///  class Y { friend class X; };
/// \endcode
///
/// Usable as: Matcher<Expr>, Matcher<ValueDecl>
AST_POLYMORPHIC_MATCHER_P_OVERLOAD(
    hasType, AST_POLYMORPHIC_SUPPORTED_TYPES(Expr, FriendDecl, ValueDecl),
    internal::Matcher<Decl>, InnerMatcher, 1) {
  QualType QT = internal::getUnderlyingType(Node);
  if (!QT.isNull())
    return qualType(hasDeclaration(InnerMatcher)).matches(QT, Finder, Builder);
  return false;
}

/// Matches if the type location of the declarator decl's type matches
/// the inner matcher.
///
/// Given
/// \code
///   int x;
/// \endcode
/// declaratorDecl(hasTypeLoc(loc(asString("int"))))
///   matches int x
AST_MATCHER_P(DeclaratorDecl, hasTypeLoc, internal::Matcher<TypeLoc>, Inner) {
  if (!Node.getTypeSourceInfo())
    // This happens for example for implicit destructors.
    return false;
  return Inner.matches(Node.getTypeSourceInfo()->getTypeLoc(), Finder, Builder);
}

/// Matches if the matched type is represented by the given string.
///
/// Given
/// \code
///   class Y { public: void x(); };
///   void z() { Y* y; y->x(); }
/// \endcode
/// cxxMemberCallExpr(on(hasType(asString("class Y *"))))
///   matches y->x()
AST_MATCHER_P(QualType, asString, std::string, Name) {
  return Name == Node.getAsString();
}

/// Matches if the matched type is a pointer type and the pointee type
/// matches the specified matcher.
///
/// Example matches y->x()
///   (matcher = cxxMemberCallExpr(on(hasType(pointsTo
///      cxxRecordDecl(hasName("Y")))))))
/// \code
///   class Y { public: void x(); };
///   void z() { Y *y; y->x(); }
/// \endcode
AST_MATCHER_P(
    QualType, pointsTo, internal::Matcher<QualType>,
    InnerMatcher) {
  return (!Node.isNull() && Node->isAnyPointerType() &&
          InnerMatcher.matches(Node->getPointeeType(), Finder, Builder));
}

/// Overloaded to match the pointee type's declaration.
AST_MATCHER_P_OVERLOAD(QualType, pointsTo, internal::Matcher<Decl>,
                       InnerMatcher, 1) {
  return pointsTo(qualType(hasDeclaration(InnerMatcher)))
      .matches(Node, Finder, Builder);
}

/// Matches if the matched type matches the unqualified desugared
/// type of the matched node.
///
/// For example, in:
/// \code
///   class A {};
///   using B = A;
/// \endcode
/// The matcher type(hasUnqualifiedDesugaredType(recordType())) matches
/// both B and A.
AST_MATCHER_P(Type, hasUnqualifiedDesugaredType, internal::Matcher<Type>,
              InnerMatcher) {
  return InnerMatcher.matches(*Node.getUnqualifiedDesugaredType(), Finder,
                              Builder);
}

/// Matches if the matched type is a reference type and the referenced
/// type matches the specified matcher.
///
/// Example matches X &x and const X &y
///     (matcher = varDecl(hasType(references(cxxRecordDecl(hasName("X"))))))
/// \code
///   class X {
///     void a(X b) {
///       X &x = b;
///       const X &y = b;
///     }
///   };
/// \endcode
AST_MATCHER_P(QualType, references, internal::Matcher<QualType>,
              InnerMatcher) {
  return (!Node.isNull() && Node->isReferenceType() &&
          InnerMatcher.matches(Node->getPointeeType(), Finder, Builder));
}

/// Matches QualTypes whose canonical type matches InnerMatcher.
///
/// Given:
/// \code
///   typedef int &int_ref;
///   int a;
///   int_ref b = a;
/// \endcode
///
/// \c varDecl(hasType(qualType(referenceType()))))) will not match the
/// declaration of b but \c
/// varDecl(hasType(qualType(hasCanonicalType(referenceType())))))) does.
AST_MATCHER_P(QualType, hasCanonicalType, internal::Matcher<QualType>,
              InnerMatcher) {
  if (Node.isNull())
    return false;
  return InnerMatcher.matches(Node.getCanonicalType(), Finder, Builder);
}

/// Overloaded to match the referenced type's declaration.
AST_MATCHER_P_OVERLOAD(QualType, references, internal::Matcher<Decl>,
                       InnerMatcher, 1) {
  return references(qualType(hasDeclaration(InnerMatcher)))
      .matches(Node, Finder, Builder);
}

AST_MATCHER_P(CXXMemberCallExpr, onImplicitObjectArgument,
              internal::Matcher<Expr>, InnerMatcher) {
  const Expr *ExprNode = Node.getImplicitObjectArgument();
  return (ExprNode != nullptr &&
          InnerMatcher.matches(*ExprNode, Finder, Builder));
}

/// Matches if the expression's type either matches the specified
/// matcher, or is a pointer to a type that matches the InnerMatcher.
AST_MATCHER_P_OVERLOAD(CXXMemberCallExpr, thisPointerType,
                       internal::Matcher<QualType>, InnerMatcher, 0) {
  return onImplicitObjectArgument(
      anyOf(hasType(InnerMatcher), hasType(pointsTo(InnerMatcher))))
      .matches(Node, Finder, Builder);
}

/// Overloaded to match the type's declaration.
AST_MATCHER_P_OVERLOAD(CXXMemberCallExpr, thisPointerType,
                       internal::Matcher<Decl>, InnerMatcher, 1) {
  return onImplicitObjectArgument(
      anyOf(hasType(InnerMatcher), hasType(pointsTo(InnerMatcher))))
      .matches(Node, Finder, Builder);
}

/// Matches a DeclRefExpr that refers to a declaration that matches the
/// specified matcher.
///
/// Example matches x in if(x)
///     (matcher = declRefExpr(to(varDecl(hasName("x")))))
/// \code
///   bool x;
///   if (x) {}
/// \endcode
AST_MATCHER_P(DeclRefExpr, to, internal::Matcher<Decl>,
              InnerMatcher) {
  const Decl *DeclNode = Node.getDecl();
  return (DeclNode != nullptr &&
          InnerMatcher.matches(*DeclNode, Finder, Builder));
}

/// Matches a \c DeclRefExpr that refers to a declaration through a
/// specific using shadow declaration.
///
/// Given
/// \code
///   namespace a { void f() {} }
///   using a::f;
///   void g() {
///     f();     // Matches this ..
///     a::f();  // .. but not this.
///   }
/// \endcode
/// declRefExpr(throughUsingDecl(anything()))
///   matches \c f()
AST_MATCHER_P(DeclRefExpr, throughUsingDecl,
              internal::Matcher<UsingShadowDecl>, InnerMatcher) {
  const NamedDecl *FoundDecl = Node.getFoundDecl();
  if (const UsingShadowDecl *UsingDecl = dyn_cast<UsingShadowDecl>(FoundDecl))
    return InnerMatcher.matches(*UsingDecl, Finder, Builder);
  return false;
}

/// Matches an \c OverloadExpr if any of the declarations in the set of
/// overloads matches the given matcher.
///
/// Given
/// \code
///   template <typename T> void foo(T);
///   template <typename T> void bar(T);
///   template <typename T> void baz(T t) {
///     foo(t);
///     bar(t);
///   }
/// \endcode
/// unresolvedLookupExpr(hasAnyDeclaration(
///     functionTemplateDecl(hasName("foo"))))
///   matches \c foo in \c foo(t); but not \c bar in \c bar(t);
AST_MATCHER_P(OverloadExpr, hasAnyDeclaration, internal::Matcher<Decl>,
              InnerMatcher) {
  return matchesFirstInPointerRange(InnerMatcher, Node.decls_begin(),
                                    Node.decls_end(), Finder, Builder);
}

/// Matches the Decl of a DeclStmt which has a single declaration.
///
/// Given
/// \code
///   int a, b;
///   int c;
/// \endcode
/// declStmt(hasSingleDecl(anything()))
///   matches 'int c;' but not 'int a, b;'.
AST_MATCHER_P(DeclStmt, hasSingleDecl, internal::Matcher<Decl>, InnerMatcher) {
  if (Node.isSingleDecl()) {
    const Decl *FoundDecl = Node.getSingleDecl();
    return InnerMatcher.matches(*FoundDecl, Finder, Builder);
  }
  return false;
}

/// Matches a variable declaration that has an initializer expression
/// that matches the given matcher.
///
/// Example matches x (matcher = varDecl(hasInitializer(callExpr())))
/// \code
///   bool y() { return true; }
///   bool x = y();
/// \endcode
AST_MATCHER_P(
    VarDecl, hasInitializer, internal::Matcher<Expr>,
    InnerMatcher) {
  const Expr *Initializer = Node.getAnyInitializer();
  return (Initializer != nullptr &&
          InnerMatcher.matches(*Initializer, Finder, Builder));
}

/// Matches a variable declaration that has function scope and is a
/// non-static local variable.
///
/// Example matches x (matcher = varDecl(hasLocalStorage())
/// \code
/// void f() {
///   int x;
///   static int y;
/// }
/// int z;
/// \endcode
AST_MATCHER(VarDecl, hasLocalStorage) {
  return Node.hasLocalStorage();
}

/// Matches a variable declaration that does not have local storage.
///
/// Example matches y and z (matcher = varDecl(hasGlobalStorage())
/// \code
/// void f() {
///   int x;
///   static int y;
/// }
/// int z;
/// \endcode
AST_MATCHER(VarDecl, hasGlobalStorage) {
  return Node.hasGlobalStorage();
}

/// Matches a variable declaration that has automatic storage duration.
///
/// Example matches x, but not y, z, or a.
/// (matcher = varDecl(hasAutomaticStorageDuration())
/// \code
/// void f() {
///   int x;
///   static int y;
///   thread_local int z;
/// }
/// int a;
/// \endcode
AST_MATCHER(VarDecl, hasAutomaticStorageDuration) {
  return Node.getStorageDuration() == SD_Automatic;
}

/// Matches a variable declaration that has static storage duration.
/// It includes the variable declared at namespace scope and those declared
/// with "static" and "extern" storage class specifiers.
///
/// \code
/// void f() {
///   int x;
///   static int y;
///   thread_local int z;
/// }
/// int a;
/// static int b;
/// extern int c;
/// varDecl(hasStaticStorageDuration())
///   matches the function declaration y, a, b and c.
/// \endcode
AST_MATCHER(VarDecl, hasStaticStorageDuration) {
  return Node.getStorageDuration() == SD_Static;
}

/// Matches a variable declaration that has thread storage duration.
///
/// Example matches z, but not x, z, or a.
/// (matcher = varDecl(hasThreadStorageDuration())
/// \code
/// void f() {
///   int x;
///   static int y;
///   thread_local int z;
/// }
/// int a;
/// \endcode
AST_MATCHER(VarDecl, hasThreadStorageDuration) {
  return Node.getStorageDuration() == SD_Thread;
}

/// Matches a variable declaration that is an exception variable from
/// a C++ catch block, or an Objective-C \@catch statement.
///
/// Example matches x (matcher = varDecl(isExceptionVariable())
/// \code
/// void f(int y) {
///   try {
///   } catch (int x) {
///   }
/// }
/// \endcode
AST_MATCHER(VarDecl, isExceptionVariable) {
  return Node.isExceptionVariable();
}

/// Checks that a call expression or a constructor call expression has
/// a specific number of arguments (including absent default arguments).
///
/// Example matches f(0, 0) (matcher = callExpr(argumentCountIs(2)))
/// \code
///   void f(int x, int y);
///   f(0, 0);
/// \endcode
AST_POLYMORPHIC_MATCHER_P(argumentCountIs,
                          AST_POLYMORPHIC_SUPPORTED_TYPES(CallExpr,
                                                          CXXConstructExpr,
                                                          ObjCMessageExpr),
                          unsigned, N) {
  return Node.getNumArgs() == N;
}

/// Matches the n'th argument of a call expression or a constructor
/// call expression.
///
/// Example matches y in x(y)
///     (matcher = callExpr(hasArgument(0, declRefExpr())))
/// \code
///   void x(int) { int y; x(y); }
/// \endcode
AST_POLYMORPHIC_MATCHER_P2(hasArgument,
                           AST_POLYMORPHIC_SUPPORTED_TYPES(CallExpr,
                                                           CXXConstructExpr,
                                                           ObjCMessageExpr),
                           unsigned, N, internal::Matcher<Expr>, InnerMatcher) {
  return (N < Node.getNumArgs() &&
          InnerMatcher.matches(
              *Node.getArg(N)->IgnoreParenImpCasts(), Finder, Builder));
}

/// Matches declaration statements that contain a specific number of
/// declarations.
///
/// Example: Given
/// \code
///   int a, b;
///   int c;
///   int d = 2, e;
/// \endcode
/// declCountIs(2)
///   matches 'int a, b;' and 'int d = 2, e;', but not 'int c;'.
AST_MATCHER_P(DeclStmt, declCountIs, unsigned, N) {
  return std::distance(Node.decl_begin(), Node.decl_end()) == (ptrdiff_t)N;
}

/// Matches the n'th declaration of a declaration statement.
///
/// Note that this does not work for global declarations because the AST
/// breaks up multiple-declaration DeclStmt's into multiple single-declaration
/// DeclStmt's.
/// Example: Given non-global declarations
/// \code
///   int a, b = 0;
///   int c;
///   int d = 2, e;
/// \endcode
/// declStmt(containsDeclaration(
///       0, varDecl(hasInitializer(anything()))))
///   matches only 'int d = 2, e;', and
/// declStmt(containsDeclaration(1, varDecl()))
/// \code
///   matches 'int a, b = 0' as well as 'int d = 2, e;'
///   but 'int c;' is not matched.
/// \endcode
AST_MATCHER_P2(DeclStmt, containsDeclaration, unsigned, N,
               internal::Matcher<Decl>, InnerMatcher) {
  const unsigned NumDecls = std::distance(Node.decl_begin(), Node.decl_end());
  if (N >= NumDecls)
    return false;
  DeclStmt::const_decl_iterator Iterator = Node.decl_begin();
  std::advance(Iterator, N);
  return InnerMatcher.matches(**Iterator, Finder, Builder);
}

/// Matches a C++ catch statement that has a catch-all handler.
///
/// Given
/// \code
///   try {
///     // ...
///   } catch (int) {
///     // ...
///   } catch (...) {
///     // ...
///   }
/// /endcode
/// cxxCatchStmt(isCatchAll()) matches catch(...) but not catch(int).
AST_MATCHER(CXXCatchStmt, isCatchAll) {
  return Node.getExceptionDecl() == nullptr;
}

/// Matches a constructor initializer.
///
/// Given
/// \code
///   struct Foo {
///     Foo() : foo_(1) { }
///     int foo_;
///   };
/// \endcode
/// cxxRecordDecl(has(cxxConstructorDecl(
///   hasAnyConstructorInitializer(anything())
/// )))
///   record matches Foo, hasAnyConstructorInitializer matches foo_(1)
AST_MATCHER_P(CXXConstructorDecl, hasAnyConstructorInitializer,
              internal::Matcher<CXXCtorInitializer>, InnerMatcher) {
  return matchesFirstInPointerRange(InnerMatcher, Node.init_begin(),
                                    Node.init_end(), Finder, Builder);
}

/// Matches the field declaration of a constructor initializer.
///
/// Given
/// \code
///   struct Foo {
///     Foo() : foo_(1) { }
///     int foo_;
///   };
/// \endcode
/// cxxRecordDecl(has(cxxConstructorDecl(hasAnyConstructorInitializer(
///     forField(hasName("foo_"))))))
///   matches Foo
/// with forField matching foo_
AST_MATCHER_P(CXXCtorInitializer, forField,
              internal::Matcher<FieldDecl>, InnerMatcher) {
  const FieldDecl *NodeAsDecl = Node.getAnyMember();
  return (NodeAsDecl != nullptr &&
      InnerMatcher.matches(*NodeAsDecl, Finder, Builder));
}

/// Matches the initializer expression of a constructor initializer.
///
/// Given
/// \code
///   struct Foo {
///     Foo() : foo_(1) { }
///     int foo_;
///   };
/// \endcode
/// cxxRecordDecl(has(cxxConstructorDecl(hasAnyConstructorInitializer(
///     withInitializer(integerLiteral(equals(1)))))))
///   matches Foo
/// with withInitializer matching (1)
AST_MATCHER_P(CXXCtorInitializer, withInitializer,
              internal::Matcher<Expr>, InnerMatcher) {
  const Expr* NodeAsExpr = Node.getInit();
  return (NodeAsExpr != nullptr &&
      InnerMatcher.matches(*NodeAsExpr, Finder, Builder));
}

/// Matches a constructor initializer if it is explicitly written in
/// code (as opposed to implicitly added by the compiler).
///
/// Given
/// \code
///   struct Foo {
///     Foo() { }
///     Foo(int) : foo_("A") { }
///     string foo_;
///   };
/// \endcode
/// cxxConstructorDecl(hasAnyConstructorInitializer(isWritten()))
///   will match Foo(int), but not Foo()
AST_MATCHER(CXXCtorInitializer, isWritten) {
  return Node.isWritten();
}

/// Matches a constructor initializer if it is initializing a base, as
/// opposed to a member.
///
/// Given
/// \code
///   struct B {};
///   struct D : B {
///     int I;
///     D(int i) : I(i) {}
///   };
///   struct E : B {
///     E() : B() {}
///   };
/// \endcode
/// cxxConstructorDecl(hasAnyConstructorInitializer(isBaseInitializer()))
///   will match E(), but not match D(int).
AST_MATCHER(CXXCtorInitializer, isBaseInitializer) {
  return Node.isBaseInitializer();
}

/// Matches a constructor initializer if it is initializing a member, as
/// opposed to a base.
///
/// Given
/// \code
///   struct B {};
///   struct D : B {
///     int I;
///     D(int i) : I(i) {}
///   };
///   struct E : B {
///     E() : B() {}
///   };
/// \endcode
/// cxxConstructorDecl(hasAnyConstructorInitializer(isMemberInitializer()))
///   will match D(int), but not match E().
AST_MATCHER(CXXCtorInitializer, isMemberInitializer) {
  return Node.isMemberInitializer();
}

/// Matches any argument of a call expression or a constructor call
/// expression, or an ObjC-message-send expression.
///
/// Given
/// \code
///   void x(int, int, int) { int y; x(1, y, 42); }
/// \endcode
/// callExpr(hasAnyArgument(declRefExpr()))
///   matches x(1, y, 42)
/// with hasAnyArgument(...)
///   matching y
///
/// For ObjectiveC, given
/// \code
///   @interface I - (void) f:(int) y; @end
///   void foo(I *i) { [i f:12]; }
/// \endcode
/// objcMessageExpr(hasAnyArgument(integerLiteral(equals(12))))
///   matches [i f:12]
AST_POLYMORPHIC_MATCHER_P(hasAnyArgument,
                          AST_POLYMORPHIC_SUPPORTED_TYPES(CallExpr,
                                                          CXXConstructExpr,
                                                          ObjCMessageExpr),
                          internal::Matcher<Expr>, InnerMatcher) {
  for (const Expr *Arg : Node.arguments()) {
    BoundNodesTreeBuilder Result(*Builder);
    if (InnerMatcher.matches(*Arg, Finder, &Result)) {
      *Builder = std::move(Result);
      return true;
    }
  }
  return false;
}

/// Matches a constructor call expression which uses list initialization.
AST_MATCHER(CXXConstructExpr, isListInitialization) {
  return Node.isListInitialization();
}

/// Matches a constructor call expression which requires
/// zero initialization.
///
/// Given
/// \code
/// void foo() {
///   struct point { double x; double y; };
///   point pt[2] = { { 1.0, 2.0 } };
/// }
/// \endcode
/// initListExpr(has(cxxConstructExpr(requiresZeroInitialization()))
/// will match the implicit array filler for pt[1].
AST_MATCHER(CXXConstructExpr, requiresZeroInitialization) {
  return Node.requiresZeroInitialization();
}

/// Matches the n'th parameter of a function or an ObjC method
/// declaration or a block.
///
/// Given
/// \code
///   class X { void f(int x) {} };
/// \endcode
/// cxxMethodDecl(hasParameter(0, hasType(varDecl())))
///   matches f(int x) {}
/// with hasParameter(...)
///   matching int x
///
/// For ObjectiveC, given
/// \code
///   @interface I - (void) f:(int) y; @end
/// \endcode
//
/// the matcher objcMethodDecl(hasParameter(0, hasName("y")))
/// matches the declaration of method f with hasParameter
/// matching y.
AST_POLYMORPHIC_MATCHER_P2(hasParameter,
                           AST_POLYMORPHIC_SUPPORTED_TYPES(FunctionDecl,
                                                           ObjCMethodDecl,
                                                           BlockDecl),
                           unsigned, N, internal::Matcher<ParmVarDecl>,
                           InnerMatcher) {
  return (N < Node.parameters().size()
          && InnerMatcher.matches(*Node.parameters()[N], Finder, Builder));
}

/// Matches all arguments and their respective ParmVarDecl.
///
/// Given
/// \code
///   void f(int i);
///   int y;
///   f(y);
/// \endcode
/// callExpr(
///   forEachArgumentWithParam(
///     declRefExpr(to(varDecl(hasName("y")))),
///     parmVarDecl(hasType(isInteger()))
/// ))
///   matches f(y);
/// with declRefExpr(...)
///   matching int y
/// and parmVarDecl(...)
///   matching int i
AST_POLYMORPHIC_MATCHER_P2(forEachArgumentWithParam,
                           AST_POLYMORPHIC_SUPPORTED_TYPES(CallExpr,
                                                           CXXConstructExpr),
                           internal::Matcher<Expr>, ArgMatcher,
                           internal::Matcher<ParmVarDecl>, ParamMatcher) {
  BoundNodesTreeBuilder Result;
  // The first argument of an overloaded member operator is the implicit object
  // argument of the method which should not be matched against a parameter, so
  // we skip over it here.
  BoundNodesTreeBuilder Matches;
  unsigned ArgIndex = cxxOperatorCallExpr(callee(cxxMethodDecl()))
                              .matches(Node, Finder, &Matches)
                          ? 1
                          : 0;
  int ParamIndex = 0;
  bool Matched = false;
  for (; ArgIndex < Node.getNumArgs(); ++ArgIndex) {
    BoundNodesTreeBuilder ArgMatches(*Builder);
    if (ArgMatcher.matches(*(Node.getArg(ArgIndex)->IgnoreParenCasts()),
                           Finder, &ArgMatches)) {
      BoundNodesTreeBuilder ParamMatches(ArgMatches);
      if (expr(anyOf(cxxConstructExpr(hasDeclaration(cxxConstructorDecl(
                         hasParameter(ParamIndex, ParamMatcher)))),
                     callExpr(callee(functionDecl(
                         hasParameter(ParamIndex, ParamMatcher))))))
              .matches(Node, Finder, &ParamMatches)) {
        Result.addMatch(ParamMatches);
        Matched = true;
      }
    }
    ++ParamIndex;
  }
  *Builder = std::move(Result);
  return Matched;
}

/// Matches any parameter of a function or an ObjC method declaration or a
/// block.
///
/// Does not match the 'this' parameter of a method.
///
/// Given
/// \code
///   class X { void f(int x, int y, int z) {} };
/// \endcode