source: src/SynTree/Type.h @ 3e7c323

//
// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// Type.h --
//
// Author           : Richard C. Bilson
// Created On       : Mon May 18 07:44:20 2015
// Last Modified By : Peter A. Buhr
// Last Modified On : Fri Feb  8 09:17:09 2019
// Update Count     : 164
//

#pragma once

#include <strings.h>         // for ffs
#include <cassert>           // for assert, assertf
#include <list>              // for list, _List_iterator
#include <ostream>           // for ostream, operator<<, basic_ostream
#include <string>            // for string

#include "BaseSyntaxNode.h"  // for BaseSyntaxNode
#include "Common/utility.h"  // for operator+
#include "Mutator.h"         // for Mutator
#include "SynTree.h"         // for AST nodes
#include "Visitor.h"         // for Visitor

class Type : public BaseSyntaxNode {
  public:
        // Simulate inheritance because union does not allow it.
        // Bug in g++-4.9 prevents static field in union
        //static const char * Names[];
        #define BFCommon( BFType, N ) \
                bool operator[]( unsigned int i ) const { return val & (1 << i); } \
                bool any() const { return val != 0; } \
                void reset() { val = 0; } \
                int ffs() { return ::ffs( val ) - 1; } \
                BFType operator&=( BFType other ) { \
                        val &= other.val; return *this; \
                } \
                BFType operator&( BFType other ) const { \
                        BFType q = other; \
                        q &= *this; \
                        return q; \
                } \
                BFType operator|=( BFType other ) { \
                        val |= other.val; return *this; \
                } \
                BFType operator|( BFType other ) const { \
                        BFType q = other; \
                        q |= *this; \
                        return q; \
                } \
                BFType operator-=( BFType other ) { \
                        val &= ~other.val; return *this; \
                } \
                void print( std::ostream & os ) const { \
                        if ( (*this).any() ) { \
                                for ( unsigned int i = 0; i < N; i += 1 ) { \
                                        if ( (*this)[i] ) { \
                                                os << BFType##Names[i] << ' '; \
                                        } \
                                } \
                        } \
                }

        // enum must remain in the same order as the corresponding bit fields.

        enum { Inline = 1 << 0, Noreturn = 1 << 1, Fortran = 1 << 2, NumFuncSpecifier = 3 };
        static const char * FuncSpecifiersNames[];
        union FuncSpecifiers {
                unsigned int val;
                struct {
                        bool is_inline : 1;
                        bool is_noreturn : 1;
                        bool is_fortran : 1;
                };
                FuncSpecifiers() : val( 0 ) {}
                FuncSpecifiers( unsigned int val ) : val( val ) {}
                // equality (==, !=) works implicitly on first field "val", relational operations are undefined.
                BFCommon( FuncSpecifiers, NumFuncSpecifier )
        }; // FuncSpecifiers

        enum { Extern = 1 << 0, Static = 1 << 1, Auto = 1 << 2, Register = 1 << 3, Threadlocal = 1 << 4, NumStorageClass = 5 };
        static const char * StorageClassesNames[];
        union StorageClasses {
                unsigned int val;
                struct {
                        bool is_extern : 1;
                        bool is_static : 1;
                        bool is_auto : 1;
                        bool is_register : 1;
                        bool is_threadlocal : 1;
                };

                StorageClasses() : val( 0 ) {}
                StorageClasses( unsigned int val ) : val( val ) {}
                // equality (==, !=) works implicitly on first field "val", relational operations are undefined.
                BFCommon( StorageClasses, NumStorageClass )
        }; // StorageClasses

        enum { Const = 1 << 0, Restrict = 1 << 1, Volatile = 1 << 2, Lvalue = 1 << 3, Mutex = 1 << 4, Atomic = 1 << 5, NumTypeQualifier = 6 };
        static const char * QualifiersNames[];
        union Qualifiers {
                enum { Mask = ~(Restrict | Lvalue) };
                unsigned int val;
                struct {
                        bool is_const : 1;
                        bool is_restrict : 1;
                        bool is_volatile : 1;
                        bool is_lvalue : 1;
                        bool is_mutex : 1;
                        bool is_atomic : 1;
                };

                Qualifiers() : val( 0 ) {}
                Qualifiers( unsigned int val ) : val( val ) {}
                // Complex comparisons provide implicit qualifier downcasting, e.g., T downcast to const T.
                bool operator==( Qualifiers other ) const { return (val & Mask) == (other.val & Mask); }
                bool operator!=( Qualifiers other ) const { return (val & Mask) != (other.val & Mask); }
                bool operator<=( Qualifiers other ) const {
                        return is_const    <= other.is_const        //Any non-const converts to const without cost
                                        && is_volatile <= other.is_volatile     //Any non-volatile converts to volatile without cost
                                        && is_mutex    >= other.is_mutex        //Any mutex converts to non-mutex without cost
                                        && is_atomic   == other.is_atomic;      //No conversion from atomic to non atomic is free
                }
                bool operator<( Qualifiers other ) const { return *this != other && *this <= other; }
                bool operator>=( Qualifiers other ) const { return ! (*this < other); }
                bool operator>( Qualifiers other ) const { return *this != other && *this >= other; }
                BFCommon( Qualifiers, NumTypeQualifier )
        }; // Qualifiers

        typedef std::list<TypeDecl *> ForallList;

        Qualifiers tq;
        ForallList forall;
        std::list< Attribute * > attributes;

        Type( const Qualifiers & tq, const std::list< Attribute * > & attributes );
        Type( const Type & other );
        virtual ~Type();

        Qualifiers & get_qualifiers() { return tq; }
        bool get_const() { return tq.is_const; }
        bool get_volatile() { return tq.is_volatile; }
        bool get_restrict() { return tq.is_restrict; }
        bool get_lvalue() { return tq.is_lvalue; }
        bool get_mutex() { return tq.is_mutex; }
        bool get_atomic() { return tq.is_atomic; }
        void set_const( bool newValue ) { tq.is_const = newValue; }
        void set_volatile( bool newValue ) { tq.is_volatile = newValue; }
        void set_restrict( bool newValue ) { tq.is_restrict = newValue; }
        void set_lvalue( bool newValue ) { tq.is_lvalue = newValue; }
        void set_mutex( bool newValue ) { tq.is_mutex = newValue; }
        void set_atomic( bool newValue ) { tq.is_atomic = newValue; }

        ForallList& get_forall() { return forall; }

        std::list< Attribute * >& get_attributes() { return attributes; }
        const std::list< Attribute * >& get_attributes() const { return attributes; }

        /// How many elemental types are represented by this type
        virtual unsigned size() const { return 1; };
        virtual bool isVoid() const { return size() == 0; }
        virtual Type * getComponent( unsigned i ) { assertf( size() == 1 && i == 0, "Type::getComponent was called with size %d and index %d\n", size(), i ); return this; }

        /// return type without outer pointers and arrays
        Type * stripDeclarator();

        /// return type without outer references
        Type * stripReferences();

        /// return the number of references occuring consecutively on the outermost layer of this type (i.e. do not count references nested within other types)
        virtual int referenceDepth() const;

        virtual bool isComplete() const { return true; }

        virtual AggregateDecl * getAggr() const { assertf( false, "Non-aggregate type: %s", toCString( this ) ); }

        virtual TypeSubstitution genericSubstitution() const;

        virtual Type *clone() const = 0;
        virtual void accept( Visitor & v ) = 0;
        virtual Type *acceptMutator( Mutator & m ) = 0;
        virtual void print( std::ostream & os, Indenter indent = {} ) const;
};

extern const Type::FuncSpecifiers noFuncSpecifiers;
extern const Type::StorageClasses noStorageClasses;
extern const Type::Qualifiers noQualifiers;                     // no qualifiers on constants

class VoidType : public Type {
  public:
        VoidType( const Type::Qualifiers & tq, const std::list< Attribute * > & attributes = std::list< Attribute * >() );

        virtual unsigned size() const override { return 0; };
        virtual bool isComplete() const override { return false; }

        virtual VoidType *clone() const override { return new VoidType( *this ); }
        virtual void accept( Visitor & v ) override { v.visit( this ); }
        virtual Type *acceptMutator( Mutator & m ) override { return m.mutate( this ); }
        virtual void print( std::ostream & os, Indenter indent = {} ) const override;
};

class BasicType : public Type {
  public:
#if 0
        enum Kind {
                Bool,
                Char,
                SignedChar,
                UnsignedChar,
                ShortSignedInt,
                ShortUnsignedInt,
                SignedInt,
                UnsignedInt,
                LongSignedInt,
                LongUnsignedInt,
                LongLongSignedInt,
                LongLongUnsignedInt,
                Float,
                Double,
                LongDouble,
                FloatComplex,
                DoubleComplex,
                LongDoubleComplex,
                FloatImaginary,
                DoubleImaginary,
                LongDoubleImaginary,
                SignedInt128,
                UnsignedInt128,
                Float80,
                Float128,
                _Float16,
                _Float32,
                _Float32x,
                _Float64,
                _Float64x,
                _Float128,
                _Float128x,
                _Float16Complex,
                _Float32Complex,
                _Float32xComplex,
                _Float64Complex,
                _Float64xComplex,
                _Float128Complex,
                _Float128xComplex,
                NUMBER_OF_BASIC_TYPES
        } kind;
#endif
        enum Kind {
                _Bool,
                Char,
                SignedChar,
                UnsignedChar,
                ShortSignedInt,
                ShortUnsignedInt,
                SignedInt,
                UnsignedInt,
                LongSignedInt,
                LongUnsignedInt,
                LongLongSignedInt,
                LongLongUnsignedInt,
                SignedInt128,
                UnsignedInt128,
                _Float16,
                _Float16Complex,
                _Float32,
                _Float32Complex,
                Float,
                FloatComplex,
                // FloatImaginary,
                _Float32x,
                _Float32xComplex,
                _Float64,
                _Float64Complex,
                Double,
                DoubleComplex,
                // DoubleImaginary,
                _Float64x,
                _Float64xComplex,
                __float80,
                _Float128,
                _Float128Complex,
                __float128,
                LongDouble,
                LongDoubleComplex,
                // LongDoubleImaginary,
                _Float128x,
                _Float128xComplex,
                NUMBER_OF_BASIC_TYPES
        } kind;

        static const char *typeNames[];                                         // string names for basic types, MUST MATCH with Kind

        BasicType( const Type::Qualifiers & tq, Kind bt, const std::list< Attribute * > & attributes = std::list< Attribute * >() );

        Kind get_kind() { return kind; }
        void set_kind( Kind newValue ) { kind = newValue; }

        virtual BasicType *clone() const override { return new BasicType( *this ); }
        virtual void accept( Visitor & v ) override { v.visit( this ); }
        virtual Type *acceptMutator( Mutator & m ) override { return m.mutate( this ); }
        virtual void print( std::ostream & os, Indenter indent = {} ) const override;

        bool isInteger() const;
};

class PointerType : public Type {
  public:
        Type *base;

        // In C99, pointer types can be qualified in many ways e.g., int f( int a[ static 3 ] )
        Expression *dimension;
        bool isVarLen;
        bool isStatic;

        PointerType( const Type::Qualifiers & tq, Type *base, const std::list< Attribute * > & attributes = std::list< Attribute * >() );
        PointerType( const Type::Qualifiers & tq, Type *base, Expression *dimension, bool isVarLen, bool isStatic, const std::list< Attribute * > & attributes = std::list< Attribute * >() );
        PointerType( const PointerType& );
        virtual ~PointerType();

        Type *get_base() { return base; }
        void set_base( Type *newValue ) { base = newValue; }
        Expression *get_dimension() { return dimension; }
        void set_dimension( Expression *newValue ) { dimension = newValue; }
        bool get_isVarLen() { return isVarLen; }
        void set_isVarLen( bool newValue ) { isVarLen = newValue; }
        bool get_isStatic() { return isStatic; }
        void set_isStatic( bool newValue ) { isStatic = newValue; }

        bool is_array() const { return isStatic || isVarLen || dimension; }

        virtual bool isComplete() const override { return ! isVarLen; }

        virtual PointerType *clone() const override { return new PointerType( *this ); }
        virtual void accept( Visitor & v ) override { v.visit( this ); }
        virtual Type *acceptMutator( Mutator & m ) override { return m.mutate( this ); }
        virtual void print( std::ostream & os, Indenter indent = {} ) const override;
};

class ArrayType : public Type {
  public:
        Type *base;
        Expression *dimension;
        bool isVarLen;
        bool isStatic;

        ArrayType( const Type::Qualifiers & tq, Type *base, Expression *dimension, bool isVarLen, bool isStatic, const std::list< Attribute * > & attributes = std::list< Attribute * >() );
        ArrayType( const ArrayType& );
        virtual ~ArrayType();

        Type *get_base() { return base; }
        void set_base( Type *newValue ) { base = newValue; }
        Expression *get_dimension() { return dimension; }
        void set_dimension( Expression *newValue ) { dimension = newValue; }
        bool get_isVarLen() { return isVarLen; }
        void set_isVarLen( bool newValue ) { isVarLen = newValue; }
        bool get_isStatic() { return isStatic; }
        void set_isStatic( bool newValue ) { isStatic = newValue; }

        // array types are complete if they have a dimension expression or are
        // VLAs ('*' in parameter declaration), and incomplete otherwise.
        // See 6.7.6.2
        virtual bool isComplete() const override { return dimension || isVarLen; }

        virtual ArrayType *clone() const override { return new ArrayType( *this ); }
        virtual void accept( Visitor & v ) override { v.visit( this ); }
        virtual Type *acceptMutator( Mutator & m ) override { return m.mutate( this ); }
        virtual void print( std::ostream & os, Indenter indent = {} ) const override;
};

class QualifiedType : public Type {
public:
        Type * parent;
        Type * child;

        QualifiedType( const Type::Qualifiers & tq, Type * parent, Type * child );
        QualifiedType( const QualifiedType & tq );
        virtual ~QualifiedType();

        virtual QualifiedType *clone() const override { return new QualifiedType( *this ); }
        virtual void accept( Visitor & v ) override { v.visit( this ); }
        virtual Type *acceptMutator( Mutator & m ) override { return m.mutate( this ); }
        virtual void print( std::ostream & os, Indenter indent = {} ) const override;
};

class ReferenceType : public Type {
public:
        Type *base;

        ReferenceType( const Type::Qualifiers & tq, Type *base, const std::list< Attribute * > & attributes = std::list< Attribute * >() );
        ReferenceType( const ReferenceType & );
        virtual ~ReferenceType();

        Type *get_base() { return base; }
        void set_base( Type *newValue ) { base = newValue; }

        virtual int referenceDepth() const override;

        // Since reference types act like value types, their size is the size of the base.
        // This makes it simple to cast the empty tuple to a reference type, since casts that increase
        // the number of values are disallowed.
        virtual unsigned size() const override { return base->size(); }

        virtual TypeSubstitution genericSubstitution() const override;

        virtual ReferenceType *clone() const override { return new ReferenceType( *this ); }
        virtual void accept( Visitor & v ) override { v.visit( this ); }
        virtual Type *acceptMutator( Mutator & m ) override { return m.mutate( this ); }
        virtual void print( std::ostream & os, Indenter indent = {} ) const override;
};

class FunctionType : public Type {
  public:
        std::list<DeclarationWithType*> returnVals;
        std::list<DeclarationWithType*> parameters;

        // Does the function accept a variable number of arguments following the arguments specified in the parameters list.
        // This could be because of
        // - an ellipsis in a prototype declaration
        // - an unprototyped declaration
        bool isVarArgs;

        FunctionType( const Type::Qualifiers & tq, bool isVarArgs, const std::list< Attribute * > & attributes = std::list< Attribute * >() );
        FunctionType( const FunctionType& );
        virtual ~FunctionType();

        std::list<DeclarationWithType*> & get_returnVals() { return returnVals; }
        std::list<DeclarationWithType*> & get_parameters() { return parameters; }
        bool get_isVarArgs() const { return isVarArgs; }
        void set_isVarArgs( bool newValue ) { isVarArgs = newValue; }
        bool isTtype() const;

        bool isUnprototyped() const { return isVarArgs && parameters.size() == 0; }

        virtual FunctionType *clone() const override { return new FunctionType( *this ); }
        virtual void accept( Visitor & v ) override { v.visit( this ); }
        virtual Type *acceptMutator( Mutator & m ) override { return m.mutate( this ); }
        virtual void print( std::ostream & os, Indenter indent = {} ) const override;
};

class ReferenceToType : public Type {
  public:
        std::list< Expression* > parameters;
        std::string name;
        bool hoistType;

        ReferenceToType( const Type::Qualifiers & tq, const std::string & name, const std::list< Attribute * > & attributes );
        ReferenceToType( const ReferenceToType & other );
        virtual ~ReferenceToType();

        const std::string & get_name() const { return name; }
        void set_name( std::string newValue ) { name = newValue; }
        std::list< Expression* >& get_parameters() { return parameters; }
        bool get_hoistType() const { return hoistType; }
        void set_hoistType( bool newValue ) { hoistType = newValue; }

        virtual ReferenceToType *clone() const override = 0;
        virtual void accept( Visitor & v ) override = 0;
        virtual Type *acceptMutator( Mutator & m ) override = 0;
        virtual void print( std::ostream & os, Indenter indent = {} ) const override;

        virtual void lookup( __attribute__((unused)) const std::string & name, __attribute__((unused)) std::list< Declaration* > & foundDecls ) const {}
  protected:
        virtual std::string typeString() const = 0;
};

class StructInstType : public ReferenceToType {
        typedef ReferenceToType Parent;
  public:
        // this decl is not "owned" by the struct inst; it is merely a pointer to elsewhere in the tree,
        // where the structure used in this type is actually defined
        StructDecl *baseStruct;

        StructInstType( const Type::Qualifiers & tq, const std::string & name, const std::list< Attribute * > & attributes = std::list< Attribute * >()  ) : Parent( tq, name, attributes ), baseStruct( 0 ) {}
        StructInstType( const Type::Qualifiers & tq, StructDecl * baseStruct, const std::list< Attribute * > & attributes = std::list< Attribute * >()  );
        StructInstType( const StructInstType & other ) : Parent( other ), baseStruct( other.baseStruct ) {}

        StructDecl *get_baseStruct() const { return baseStruct; }
        void set_baseStruct( StructDecl *newValue ) { baseStruct = newValue; }

        /// Accesses generic parameters of base struct (NULL if none such)
        std::list<TypeDecl*> * get_baseParameters();
        const std::list<TypeDecl*> * get_baseParameters() const;

        virtual bool isComplete() const override;

        virtual AggregateDecl * getAggr() const override;

        virtual TypeSubstitution genericSubstitution() const override;

        /// Looks up the members of this struct named "name" and places them into "foundDecls".
        /// Clones declarations into "foundDecls", caller responsible for freeing
        void lookup( const std::string & name, std::list< Declaration* > & foundDecls ) const override;

        virtual StructInstType *clone() const override { return new StructInstType( *this ); }
        virtual void accept( Visitor & v ) override { v.visit( this ); }
        virtual Type *acceptMutator( Mutator & m ) override { return m.mutate( this ); }

        virtual void print( std::ostream & os, Indenter indent = {} ) const override;
  private:
        virtual std::string typeString() const override;
};

class UnionInstType : public ReferenceToType {
        typedef ReferenceToType Parent;
  public:
        // this decl is not "owned" by the union inst; it is merely a pointer to elsewhere in the tree,
        // where the union used in this type is actually defined
        UnionDecl *baseUnion;

        UnionInstType( const Type::Qualifiers & tq, const std::string & name, const std::list< Attribute * > & attributes = std::list< Attribute * >()  ) : Parent( tq, name, attributes ), baseUnion( 0 ) {}
        UnionInstType( const Type::Qualifiers & tq, UnionDecl * baseUnion, const std::list< Attribute * > & attributes = std::list< Attribute * >()  );
        UnionInstType( const UnionInstType & other ) : Parent( other ), baseUnion( other.baseUnion ) {}

        UnionDecl *get_baseUnion() const { return baseUnion; }
        void set_baseUnion( UnionDecl * newValue ) { baseUnion = newValue; }

        /// Accesses generic parameters of base union (NULL if none such)
        std::list<TypeDecl*> * get_baseParameters();
        const std::list<TypeDecl*> * get_baseParameters() const;

        virtual bool isComplete() const override;

        virtual AggregateDecl * getAggr() const override;

        virtual TypeSubstitution genericSubstitution() const override;

        /// looks up the members of this union named "name" and places them into "foundDecls"
        /// Clones declarations into "foundDecls", caller responsible for freeing
        void lookup( const std::string & name, std::list< Declaration* > & foundDecls ) const override;

        virtual UnionInstType *clone() const override { return new UnionInstType( *this ); }
        virtual void accept( Visitor & v ) override { v.visit( this ); }
        virtual Type *acceptMutator( Mutator & m ) override { return m.mutate( this ); }

        virtual void print( std::ostream & os, Indenter indent = {} ) const override;
  private:
        virtual std::string typeString() const override;
};

class EnumInstType : public ReferenceToType {
        typedef ReferenceToType Parent;
  public:
        // this decl is not "owned" by the union inst; it is merely a pointer to elsewhere in the tree,
        // where the union used in this type is actually defined
        EnumDecl *baseEnum = nullptr;

        EnumInstType( const Type::Qualifiers & tq, const std::string & name, const std::list< Attribute * > & attributes = std::list< Attribute * >()  ) : Parent( tq, name, attributes ) {}
        EnumInstType( const Type::Qualifiers & tq, EnumDecl * baseEnum, const std::list< Attribute * > & attributes = std::list< Attribute * >()  );
        EnumInstType( const EnumInstType & other ) : Parent( other ), baseEnum( other.baseEnum ) {}

        EnumDecl *get_baseEnum() const { return baseEnum; }
        void set_baseEnum( EnumDecl *newValue ) { baseEnum = newValue; }

        virtual bool isComplete() const override;

        virtual AggregateDecl * getAggr() const override;

        virtual EnumInstType *clone() const override { return new EnumInstType( *this ); }
        virtual void accept( Visitor & v ) override { v.visit( this ); }
        virtual Type *acceptMutator( Mutator & m ) override { return m.mutate( this ); }

        virtual void print( std::ostream & os, Indenter indent = {} ) const override;
  private:
        virtual std::string typeString() const override;
};

class TraitInstType : public ReferenceToType {
        typedef ReferenceToType Parent;
  public:
        // this decl is not "owned" by the trait inst; it is merely a pointer to elsewhere in the tree,
        // where the trait used in this type is actually defined
        TraitDecl * baseTrait = nullptr;

        TraitInstType( const Type::Qualifiers & tq, const std::string & name, const std::list< Attribute * > & attributes = std::list< Attribute * >() ) : Parent( tq, name, attributes ) {}
        TraitInstType( const Type::Qualifiers & tq, TraitDecl * baseTrait, const std::list< Attribute * > & attributes = std::list< Attribute * >() );
        TraitInstType( const TraitInstType & other );
        ~TraitInstType();

        virtual bool isComplete() const override;

        virtual TraitInstType *clone() const override { return new TraitInstType( *this ); }
        virtual void accept( Visitor & v ) override { v.visit( this ); }
        virtual Type *acceptMutator( Mutator & m ) override { return m.mutate( this ); }
  private:
        virtual std::string typeString() const override;
};

class TypeInstType : public ReferenceToType {
        typedef ReferenceToType Parent;
  public:
        // this decl is not "owned" by the type inst; it is merely a pointer to elsewhere in the tree,
        // where the type used here is actually defined
        TypeDecl *baseType;
        bool isFtype;

        TypeInstType( const Type::Qualifiers & tq, const std::string & name, TypeDecl *baseType, const std::list< Attribute * > & attributes = std::list< Attribute * >()  );
        TypeInstType( const Type::Qualifiers & tq, const std::string & name, bool isFtype, const std::list< Attribute * > & attributes = std::list< Attribute * >()  );
        TypeInstType( const TypeInstType & other );
        ~TypeInstType();

        TypeDecl *get_baseType() const { return baseType; }
        void set_baseType( TypeDecl *newValue );
        bool get_isFtype() const { return isFtype; }
        void set_isFtype( bool newValue ) { isFtype = newValue; }

        virtual bool isComplete() const override;

        virtual TypeInstType *clone() const override { return new TypeInstType( *this ); }
        virtual void accept( Visitor & v ) override { v.visit( this ); }
        virtual Type *acceptMutator( Mutator & m ) override { return m.mutate( this ); }
        virtual void print( std::ostream & os, Indenter indent = {} ) const override;
  private:
        virtual std::string typeString() const override;
};

class TupleType : public Type {
  public:
        std::list<Type *> types;
        std::list<Declaration *> members;

        TupleType( const Type::Qualifiers & tq, const std::list< Type * > & types, const std::list< Attribute * > & attributes = std::list< Attribute * >()  );
        TupleType( const TupleType& );
        virtual ~TupleType();

        typedef std::list<Type*> value_type;
        typedef value_type::iterator iterator;

        std::list<Type *> & get_types() { return types; }
        virtual unsigned size() const override { return types.size(); };

        // For now, this is entirely synthetic -- tuple types always have unnamed members.
        // Eventually, we may allow named tuples, in which case members should subsume types
        std::list<Declaration *> & get_members() { return members; }

        iterator begin() { return types.begin(); }
        iterator end() { return types.end(); }

        virtual Type * getComponent( unsigned i ) override {
                assertf( i < size(), "TupleType::getComponent: index %d must be less than size %d", i, size() );
                return *(begin()+i);
        }

        // virtual bool isComplete() const override { return true; } // xxx - not sure if this is right, might need to recursively check complete-ness

        virtual TupleType *clone() const override { return new TupleType( *this ); }
        virtual void accept( Visitor & v ) override { v.visit( this ); }
        virtual Type *acceptMutator( Mutator & m ) override { return m.mutate( this ); }
        virtual void print( std::ostream & os, Indenter indent = {} ) const override;
};

class TypeofType : public Type {
  public:
        Expression *expr;    ///< expression to take the type of
        bool is_basetypeof;  ///< true iff is basetypeof type

        TypeofType( const Type::Qualifiers & tq, Expression *expr, const std::list< Attribute * > & attributes = std::list< Attribute * >() );
        TypeofType( const Type::Qualifiers & tq, Expression *expr, bool is_basetypeof, 
                const std::list< Attribute * > & attributes = std::list< Attribute * >() );
        TypeofType( const TypeofType& );
        virtual ~TypeofType();

        Expression *get_expr() const { return expr; }
        void set_expr( Expression *newValue ) { expr = newValue; }

        virtual bool isComplete() const override { assert( false ); return false; }

        virtual TypeofType *clone() const override { return new TypeofType( *this ); }
        virtual void accept( Visitor & v ) override { v.visit( this ); }
        virtual Type *acceptMutator( Mutator & m ) override { return m.mutate( this ); }
        virtual void print( std::ostream & os, Indenter indent = {} ) const override;
};

class AttrType : public Type {
  public:
        std::string name;
        Expression *expr;
        Type *type;
        bool isType;

        AttrType( const Type::Qualifiers & tq, const std::string & name, Expression *expr, const std::list< Attribute * > & attributes = std::list< Attribute * >() );
        AttrType( const Type::Qualifiers & tq, const std::string & name, Type *type, const std::list< Attribute * > & attributes = std::list< Attribute * >()  );
        AttrType( const AttrType& );
        virtual ~AttrType();

        const std::string & get_name() const { return name; }
        void set_name( const std::string & newValue ) { name = newValue; }
        Expression *get_expr() const { return expr; }
        void set_expr( Expression *newValue ) { expr = newValue; }
        Type *get_type() const { return type; }
        void set_type( Type *newValue ) { type = newValue; }
        bool get_isType() const { return isType; }
        void set_isType( bool newValue ) { isType = newValue; }

        virtual bool isComplete() const override { assert( false ); } // xxx - not sure what to do here

        virtual AttrType *clone() const override { return new AttrType( *this ); }
        virtual void accept( Visitor & v ) override { v.visit( this ); }
        virtual Type *acceptMutator( Mutator & m ) override { return m.mutate( this ); }
        virtual void print( std::ostream & os, Indenter indent = {} ) const override;
};

/// Represents the GCC built-in varargs type
class VarArgsType : public Type {
  public:
        VarArgsType();
        VarArgsType( Type::Qualifiers tq, const std::list< Attribute * > & attributes = std::list< Attribute * >()  );

        virtual bool isComplete() const override{ return true; } // xxx - is this right?

        virtual VarArgsType *clone() const override { return new VarArgsType( *this ); }
        virtual void accept( Visitor & v ) override { v.visit( this ); }
        virtual Type *acceptMutator( Mutator & m ) override { return m.mutate( this ); }
        virtual void print( std::ostream & os, Indenter indent = {} ) const override;
};

/// Represents a zero constant
class ZeroType : public Type {
  public:
        ZeroType();
        ZeroType( Type::Qualifiers tq, const std::list< Attribute * > & attributes = std::list< Attribute * >()  );

        virtual ZeroType *clone() const override { return new ZeroType( *this ); }
        virtual void accept( Visitor & v ) override { v.visit( this ); }
        virtual Type *acceptMutator( Mutator & m ) override { return m.mutate( this ); }
        virtual void print( std::ostream & os, Indenter indent = {} ) const override;
};

/// Represents a one constant
class OneType : public Type {
  public:
        OneType();
        OneType( Type::Qualifiers tq, const std::list< Attribute * > & attributes = std::list< Attribute * >()  );

        virtual OneType *clone() const override { return new OneType( *this ); }
        virtual void accept( Visitor & v ) override { v.visit( this ); }
        virtual Type *acceptMutator( Mutator & m ) override { return m.mutate( this ); }
        virtual void print( std::ostream & os, Indenter indent = {} ) const override;
};

class GlobalScopeType : public Type {
  public:
        GlobalScopeType();

        virtual GlobalScopeType *clone() const override { return new GlobalScopeType( *this ); }
        virtual void accept( Visitor & v ) override { v.visit( this ); }
        virtual Type *acceptMutator( Mutator & m ) override { return m.mutate( this ); }
        virtual void print( std::ostream & os, Indenter indent = {} ) const override;
};

// Local Variables: //
// tab-width: 4 //
// mode: c++ //
// compile-command: "make install" //
// End: //