source: src/SynTree/Expression.h @ bfc7811

//
// 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.
//
// Expression.h --
//
// Author           : Richard C. Bilson
// Created On       : Mon May 18 07:44:20 2015
// Last Modified By : Peter A. Buhr
// Last Modified On : Sun Sep  3 19:23:46 2017
// Update Count     : 48
//

#pragma once

#include <iosfwd>                 // for ostream
#include <list>                   // for list, list<>::iterator
#include <map>                    // for map, map<>::value_compare
#include <memory>                 // for allocator, unique_ptr
#include <string>                 // for string

#include "BaseSyntaxNode.h"       // for BaseSyntaxNode
#include "Constant.h"             // for Constant
#include "Initializer.h"          // for Designation (ptr only), Initializer
#include "Label.h"                // for Label
#include "Mutator.h"              // for Mutator
#include "SynTree.h"              // for UniqueId
#include "Visitor.h"              // for Visitor


struct ParamEntry;

typedef std::map< UniqueId, ParamEntry > InferredParams;

/// ParamEntry contains the i.d. of a declaration and a type that is derived from that declaration,
/// but subject to decay-to-pointer and type parameter renaming
struct ParamEntry {
        ParamEntry(): decl( 0 ), actualType( 0 ), formalType( 0 ), expr( 0 ), inferParams( new InferredParams ) {}
        ParamEntry( UniqueId decl, Type * actualType, Type * formalType, Expression* expr ): decl( decl ), actualType( actualType ), formalType( formalType ), expr( expr ), inferParams( new InferredParams ) {}
        ParamEntry( const ParamEntry & other );
        ParamEntry & operator=( const ParamEntry & other );

        UniqueId decl;
        Type * actualType;
        Type * formalType;
        Expression * expr;
        std::unique_ptr< InferredParams > inferParams;
};

/// Expression is the root type for all expressions
class Expression : public BaseSyntaxNode {
  protected:
        virtual ~Expression();

  public:
        Type * result;
        TypeSubstitution * env;
        bool extension = false;
        InferredParams inferParams;

        Expression();
        Expression( const Expression & other );

        Type *& get_result() { return result; }
        const Type * get_result() const { return result; }
        void set_result( Type * newValue ) { result = newValue; }

        TypeSubstitution * get_env() const { return env; }
        void set_env( TypeSubstitution * newValue ) { env = newValue; }
        bool get_extension() const { return extension; }
        Expression * set_extension( bool exten ) { extension = exten; return this; }

        InferredParams & get_inferParams() { return inferParams; }

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

/// ApplicationExpr represents the application of a function to a set of parameters.  This is the result of running an
/// UntypedExpr through the expression analyzer.
class ApplicationExpr : public Expression {
  public:
        Expression * function;
        std::list<Expression *> args;

        ApplicationExpr( Expression * function, const std::list<Expression *> & args = std::list< Expression * >() );
        ApplicationExpr( const ApplicationExpr & other );

        Expression * get_function() const { return function; }
        void set_function( Expression * newValue ) { function = newValue; }
        std::list<Expression *>& get_args() { return args; }

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

/// UntypedExpr represents the application of a function to a set of parameters, but where the particular overload for
/// the function name has not yet been determined.  Most operators are converted into functional form automatically, to
/// permit operator overloading.
class UntypedExpr : public Expression {
  public:
        Expression * function;
        std::list<Expression*> args;

        UntypedExpr( Expression * function, const std::list<Expression *> & args = std::list< Expression * >() );
        UntypedExpr( const UntypedExpr & other );

        Expression * get_function() const { return function; }
        void set_function( Expression * newValue ) { function = newValue; }

        std::list<Expression*>::iterator begin_args() { return args.begin(); }
        std::list<Expression*>::iterator end_args() { return args.end(); }
        std::list<Expression*>& get_args() { return args; }

        static UntypedExpr * createDeref( Expression * arg );
        static UntypedExpr * createAssign( Expression * arg1, Expression * arg2 );

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

/// NameExpr contains a name whose meaning is still not determined
class NameExpr : public Expression {
  public:
        std::string name;

        NameExpr( std::string name );
        NameExpr( const NameExpr & other );

        const std::string & get_name() const { return name; }
        void set_name( std::string newValue ) { name = newValue; }

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

// The following classes are used to represent expression types that cannot be converted into
// function-call format.

/// AddressExpr represents a address-of expression, e.g. & e
class AddressExpr : public Expression {
  public:
        Expression * arg;

        AddressExpr( Expression * arg );
        AddressExpr( const AddressExpr & other );

        Expression * get_arg() const { return arg; }
        void set_arg(Expression * newValue ) { arg = newValue; }

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

// GCC &&label
// https://gcc.gnu.org/onlinedocs/gcc-3.4.2/gcc/Labels-as-Values.html
class LabelAddressExpr : public Expression {
  public:
        Label arg;

        LabelAddressExpr( const Label &arg );
        LabelAddressExpr( const LabelAddressExpr & other );

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

/// CastExpr represents a type cast expression, e.g. (int)e
class CastExpr : public Expression {
  public:
        Expression * arg;

        CastExpr( Expression * arg );
        CastExpr( Expression * arg, Type * toType );
        CastExpr( const CastExpr & other );

        Expression * get_arg() const { return arg; }
        void set_arg( Expression * newValue ) { arg = newValue; }

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

/// VirtualCastExpr repersents a virtual dynamic cast, e.g. (virtual exception)e
class VirtualCastExpr : public Expression {
  public:
        Expression * arg;

        VirtualCastExpr( Expression * arg, Type * toType );
        VirtualCastExpr( const VirtualCastExpr & other );

        Expression * get_arg() const { return arg; }
        void set_arg( Expression * newValue ) { arg = newValue; }

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

/// UntypedMemberExpr represents a member selection operation, e.g. q.p before processing by the expression analyzer
class UntypedMemberExpr : public Expression {
  public:
        Expression * member;
        Expression * aggregate;

        UntypedMemberExpr( Expression * member, Expression * aggregate );
        UntypedMemberExpr( const UntypedMemberExpr & other );

        Expression * get_member() const { return member; }
        void set_member( Expression * newValue ) { member = newValue; }
        Expression * get_aggregate() const { return aggregate; }
        void set_aggregate( Expression * newValue ) { aggregate = newValue; }

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

/// MemberExpr represents a member selection operation, e.g. q.p after processing by the expression analyzer.
/// Does not take ownership of member.
class MemberExpr : public Expression {
  public:
        DeclarationWithType * member;
        Expression * aggregate;

        MemberExpr( DeclarationWithType * member, Expression * aggregate );
        MemberExpr( const MemberExpr & other );

        DeclarationWithType * get_member() const { return member; }
        void set_member( DeclarationWithType * newValue ) { member = newValue; }
        Expression * get_aggregate() const { return aggregate; }
        void set_aggregate( Expression * newValue ) { aggregate = newValue; }

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

/// VariableExpr represents an expression that simply refers to the value of a named variable.
/// Does not take ownership of var.
class VariableExpr : public Expression {
  public:
        DeclarationWithType * var;

        VariableExpr( DeclarationWithType * var );
        VariableExpr( const VariableExpr & other );

        DeclarationWithType * get_var() const { return var; }
        void set_var( DeclarationWithType * newValue ) { var = newValue; }

        static VariableExpr * functionPointer( FunctionDecl * decl );

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

/// ConstantExpr represents an expression that simply refers to the value of a constant
class ConstantExpr : public Expression {
  public:
        Constant constant;

        ConstantExpr( Constant constant );
        ConstantExpr( const ConstantExpr & other );

        Constant * get_constant() { return & constant; }
        const Constant * get_constant() const { return & constant; }
        void set_constant( const Constant & newValue ) { constant = newValue; }

        long long int intValue() const;

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

/// SizeofExpr represents a sizeof expression (could be sizeof(int) or sizeof 3+4)
class SizeofExpr : public Expression {
  public:
        Expression * expr;
        Type * type;
        bool isType;

        SizeofExpr( Expression * expr );
        SizeofExpr( const SizeofExpr & other );
        SizeofExpr( Type * type );

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

/// AlignofExpr represents an alignof expression
class AlignofExpr : public Expression {
  public:
        Expression * expr;
        Type * type;
        bool isType;

        AlignofExpr( Expression * expr );
        AlignofExpr( const AlignofExpr & other );
        AlignofExpr( Type * type );

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

/// UntypedOffsetofExpr represents an offsetof expression before resolution
class UntypedOffsetofExpr : public Expression {
  public:
        Type * type;
        std::string member;

        UntypedOffsetofExpr( Type * type, const std::string & member );
        UntypedOffsetofExpr( const UntypedOffsetofExpr & other );

        std::string get_member() const { return member; }
        void set_member( const std::string & newValue ) { member = newValue; }
        Type * get_type() const { return type; }
        void set_type( Type * newValue ) { type = newValue; }

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

/// OffsetofExpr represents an offsetof expression
class OffsetofExpr : public Expression {
  public:
        Type * type;
        DeclarationWithType * member;

        OffsetofExpr( Type * type, DeclarationWithType * member );
        OffsetofExpr( const OffsetofExpr & other );

        Type * get_type() const { return type; }
        void set_type( Type * newValue ) { type = newValue; }
        DeclarationWithType * get_member() const { return member; }
        void set_member( DeclarationWithType * newValue ) { member = newValue; }

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

/// Expression representing a pack of field-offsets for a generic type
class OffsetPackExpr : public Expression {
public:
        StructInstType * type;

        OffsetPackExpr( StructInstType * type );
        OffsetPackExpr( const OffsetPackExpr & other );

        StructInstType * get_type() const { return type; }
        void set_type( StructInstType * newValue ) { type = newValue; }

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

/// AttrExpr represents an @attribute expression (like sizeof, but user-defined)
class AttrExpr : public Expression {
  public:
        Expression * attr;
        Expression * expr;
        Type * type;
        bool isType;

        AttrExpr(Expression * attr, Expression * expr );
        AttrExpr( const AttrExpr & other );
        AttrExpr( Expression * attr, Type * type );

        Expression * get_attr() const { return attr; }
        void set_attr( Expression * newValue ) { attr = 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 AttrExpr * clone() const { return new AttrExpr( * this ); }
        virtual void accept( Visitor & v ) { v.visit( this ); }
        virtual Expression * acceptMutator( Mutator & m ) { return m.mutate( this ); }
        virtual void print( std::ostream & os, Indenter indent = {} ) const;
};

/// LogicalExpr represents a short-circuit boolean expression (&& or ||)
class LogicalExpr : public Expression {
  public:
        Expression * arg1;
        Expression * arg2;

        LogicalExpr( Expression * arg1, Expression * arg2, bool andp = true );
        LogicalExpr( const LogicalExpr & other );

        bool get_isAnd() const { return isAnd; }
        Expression * get_arg1() { return arg1; }
        void set_arg1( Expression * newValue ) { arg1 = newValue; }
        Expression * get_arg2() const { return arg2; }
        void set_arg2( Expression * newValue ) { arg2 = newValue; }

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

  private:
        bool isAnd;
};

/// ConditionalExpr represents the three-argument conditional ( p ? a : b )
class ConditionalExpr : public Expression {
  public:
        Expression * arg1;
        Expression * arg2;
        Expression * arg3;

        ConditionalExpr( Expression * arg1, Expression * arg2, Expression * arg3 );
        ConditionalExpr( const ConditionalExpr & other );

        Expression * get_arg1() const { return arg1; }
        void set_arg1( Expression * newValue ) { arg1 = newValue; }
        Expression * get_arg2() const { return arg2; }
        void set_arg2( Expression * newValue ) { arg2 = newValue; }
        Expression * get_arg3() const { return arg3; }
        void set_arg3( Expression * newValue ) { arg3 = newValue; }

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

/// CommaExpr represents the sequence operator ( a, b )
class CommaExpr : public Expression {
  public:
        Expression * arg1;
        Expression * arg2;

        CommaExpr( Expression * arg1, Expression * arg2 );
        CommaExpr( const CommaExpr & other );

        Expression * get_arg1() const { return arg1; }
        void set_arg1( Expression * newValue ) { arg1 = newValue; }
        Expression * get_arg2() const { return arg2; }
        void set_arg2( Expression * newValue ) { arg2 = newValue; }

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

/// TypeExpr represents a type used in an expression (e.g. as a type generator parameter)
class TypeExpr : public Expression {
  public:
        Type * type;

        TypeExpr( Type * type );
        TypeExpr( const TypeExpr & other );

        Type * get_type() const { return type; }
        void set_type( Type * newValue ) { type = newValue; }

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

/// AsmExpr represents a GCC 'asm constraint operand' used in an asm statement: [output] "=f" (result)
class AsmExpr : public Expression {
  public:
        Expression * inout;
        Expression * constraint;
        Expression * operand;

        AsmExpr( Expression * inout, Expression * constraint, Expression * operand ) : inout( inout ), constraint( constraint ), operand( operand ) {}
        AsmExpr( const AsmExpr & other );

        Expression * get_inout() const { return inout; }
        void set_inout( Expression * newValue ) { inout = newValue; }

        Expression * get_constraint() const { return constraint; }
        void set_constraint( Expression * newValue ) { constraint = newValue; }

        Expression * get_operand() const { return operand; }
        void set_operand( Expression * newValue ) { operand = newValue; }

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

        // https://gcc.gnu.org/onlinedocs/gcc-4.7.1/gcc/Machine-Constraints.html#Machine-Constraints
};

/// ImplicitCopyCtorExpr represents the application of a function to a set of parameters,
/// along with a set of copy constructor calls, one for each argument.
class ImplicitCopyCtorExpr : public Expression {
protected:
        virtual ~ImplicitCopyCtorExpr();

public:
        ApplicationExpr * callExpr;
        std::list< ObjectDecl * > tempDecls;
        std::list< ObjectDecl * > returnDecls;
        std::list< Expression * > dtors;

        ImplicitCopyCtorExpr( ApplicationExpr * callExpr );
        ImplicitCopyCtorExpr( const ImplicitCopyCtorExpr & other );

        ApplicationExpr * get_callExpr() const { return callExpr; }
        void set_callExpr( ApplicationExpr * newValue ) { callExpr = newValue; }

        std::list< ObjectDecl * > & get_tempDecls() { return tempDecls; }
        std::list< ObjectDecl * > & get_returnDecls() { return returnDecls; }
        std::list< Expression * > & get_dtors() { return dtors; }

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

/// ConstructorExpr represents the use of a constructor in an expression context, e.g. int * x = malloc() { 5 };
class ConstructorExpr : public Expression {
public:
        Expression * callExpr;

        ConstructorExpr( Expression * callExpr );
        ConstructorExpr( const ConstructorExpr & other );

        Expression * get_callExpr() const { return callExpr; }
        void set_callExpr( Expression * newValue ) { callExpr = newValue; }

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

/// CompoundLiteralExpr represents a C99 'compound literal'
class CompoundLiteralExpr : public Expression {
  public:
        Initializer * initializer;

        CompoundLiteralExpr( Type * type, Initializer * initializer );
        CompoundLiteralExpr( const CompoundLiteralExpr & other );

        Initializer * get_initializer() const { return initializer; }
        void set_initializer( Initializer * i ) { initializer = i; }

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

/// RangeExpr represents a range e.g. '3 ... 5' or '1~10'
class RangeExpr : public Expression {
  public:
        Expression * low, * high;

        RangeExpr( Expression * low, Expression * high );
        RangeExpr( const RangeExpr & other );

        Expression * get_low() const { return low; }
        Expression * get_high() const { return high; }
        RangeExpr * set_low( Expression * low ) { RangeExpr::low = low; return this; }
        RangeExpr * set_high( Expression * high ) { RangeExpr::high = high; return this; }

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

/// UntypedTupleExpr represents a tuple expression ( [a, b, c] ) before resolution
class UntypedTupleExpr : public Expression {
  public:
        std::list<Expression*> exprs;

        UntypedTupleExpr( const std::list< Expression * > & exprs );
        UntypedTupleExpr( const UntypedTupleExpr & other );

        std::list<Expression*>& get_exprs() { return exprs; }

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

/// TupleExpr represents a tuple expression ( [a, b, c] )
class TupleExpr : public Expression {
  public:
        std::list<Expression*> exprs;

        TupleExpr( const std::list< Expression * > & exprs );
        TupleExpr( const TupleExpr & other );

        std::list<Expression*>& get_exprs() { return exprs; }

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

/// TupleIndexExpr represents an element selection operation on a tuple value, e.g. t.3 after processing by the expression analyzer
class TupleIndexExpr : public Expression {
  public:
        Expression * tuple;
        unsigned int index;

        TupleIndexExpr( Expression * tuple, unsigned int index );
        TupleIndexExpr( const TupleIndexExpr & other );

        Expression * get_tuple() const { return tuple; }
        int get_index() const { return index; }
        TupleIndexExpr * set_tuple( Expression * newValue ) { tuple = newValue; return this; }
        TupleIndexExpr * set_index( unsigned int newValue ) { index = newValue; return this; }

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

/// TupleAssignExpr represents a multiple assignment operation, where both sides of the assignment have tuple type, e.g. [a, b, c] = [d, e, f];, a mass assignment operation, where the left hand side has tuple type and the right hand side does not, e.g. [a, b, c] = 5.0;, or a tuple ctor/dtor expression
class TupleAssignExpr : public Expression {
  public:
        StmtExpr * stmtExpr = nullptr;

        TupleAssignExpr( const std::list< Expression * > & assigns, const std::list< ObjectDecl * > & tempDecls );
        TupleAssignExpr( const TupleAssignExpr & other );

        TupleAssignExpr * set_stmtExpr( StmtExpr * newValue ) { stmtExpr = newValue; return this; }
        StmtExpr * get_stmtExpr() const { return stmtExpr; }

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

/// StmtExpr represents a GCC 'statement expression', e.g. ({ int x = 5; x; })
class StmtExpr : public Expression {
public:
        CompoundStmt * statements;
        std::list< ObjectDecl * > returnDecls; // return variable(s) for stmt expression
        std::list< Expression * > dtors; // destructor(s) for return variable(s)

        StmtExpr( CompoundStmt * statements );
        StmtExpr( const StmtExpr & other );

        CompoundStmt * get_statements() const { return statements; }
        StmtExpr * set_statements( CompoundStmt * newValue ) { statements = newValue; return this; }

        // call to set the result type of this StmtExpr based on its body
        void computeResult();

        std::list< ObjectDecl * > & get_returnDecls() { return returnDecls; }
        std::list< Expression * > & get_dtors() { return dtors; }

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

class UniqueExpr : public Expression {
public:
        Expression * expr;
        ObjectDecl * object;
        VariableExpr * var;

        UniqueExpr( Expression * expr, long long idVal = -1 );
        UniqueExpr( const UniqueExpr & other );

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

        ObjectDecl * get_object() const { return object; }
        UniqueExpr * set_object( ObjectDecl * newValue ) { object = newValue; return this; }

        VariableExpr * get_var() const { return var; }
        UniqueExpr * set_var( VariableExpr * newValue ) { var = newValue; return this; }

        int get_id() const { return id; }

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

private:
        int id;
        static long long count;
};

struct InitAlternative {
public:
        Type * type = nullptr;
        Designation * designation = nullptr;
        InitAlternative( Type * type, Designation * designation );
        InitAlternative( const InitAlternative & other );
        InitAlternative & operator=( const Initializer & other ) = delete; // at the moment this isn't used, and I don't want to implement it
};

class UntypedInitExpr : public Expression {
public:
        Expression * expr;
        std::list<InitAlternative> initAlts;

        UntypedInitExpr( Expression * expr, const std::list<InitAlternative> & initAlts );
        UntypedInitExpr( const UntypedInitExpr & other );

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

        std::list<InitAlternative> & get_initAlts() { return initAlts; }

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

class InitExpr : public Expression {
public:
        Expression * expr;
        Designation * designation;

        InitExpr( Expression * expr, Designation * designation );
        InitExpr( const InitExpr & other );

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

        Designation * get_designation() const { return designation; }
        InitExpr * set_designation( Designation * newValue ) { designation = newValue; return this; }

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

/// expression that contains a deleted identifier - should never make it past the resolver.
class DeletedExpr : public Expression {
public:
        Expression * expr;
        BaseSyntaxNode * deleteStmt;

        DeletedExpr( Expression * expr, BaseSyntaxNode * deleteStmt );
        DeletedExpr( const DeletedExpr & other );

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

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