source: src/AST/Decl.hpp @ 23f99e1

//
// 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.
//
// Decl.hpp --
//
// Author           : Aaron B. Moss
// Created On       : Thu May 9 10:00:00 2019
// Last Modified By : Aaron B. Moss
// Last Modified On : Thu May 9 10:00:00 2019
// Update Count     : 1
//

#pragma once

#include <string>              // for string, to_string
#include <unordered_map>
#include <vector>

#include "FunctionSpec.hpp"
#include "Fwd.hpp"             // for UniqueId
#include "LinkageSpec.hpp"
#include "Node.hpp"            // for ptr, readonly
#include "ParseNode.hpp"
#include "StorageClasses.hpp"
#include "Type.hpp"            // for Type, ptr<Type>
#include "Visitor.hpp"
#include "Parser/ParseNode.h"  // for DeclarationNode::Aggregate

namespace ast {

class Attribute;
class Expr;
class Init;
class TypeDecl;

/// Base declaration class
class Decl : public ParseNode {
public:
        std::string name;
        Storage::Classes storage;
        Linkage::Spec linkage;
        UniqueId uniqueId = 0;
        bool extension = false;

        Decl( const CodeLocation& loc, const std::string& name, Storage::Classes storage,
                Linkage::Spec linkage )
        : ParseNode( loc ), name( name ), storage( storage ), linkage( linkage ) {}

        Decl* set_extension( bool ex ) { extension = ex; return this; }

        /// Ensures this node has a unique ID
        void fixUniqueId();
        /// Get canonical declaration for unique ID
        static readonly<Decl> fromId( UniqueId id );

        const Decl * accept( Visitor & v ) const override = 0;
private:
        Decl * clone() const override = 0;
};

/// Typed declaration base class
class DeclWithType : public Decl {
public:
        /// Represents the type with all types and typedefs expanded.
        /// This field is generated by SymTab::Validate::Pass2
        std::string mangleName;
        /// Stores the scope level at which the variable was declared.
        /// Used to access shadowed identifiers.
        int scopeLevel = 0;

        std::vector<ptr<Attribute>> attributes;
        Function::Specs funcSpec;
        ptr<Expr> asmName;
        bool isDeleted = false;

        DeclWithType( const CodeLocation& loc, const std::string& name, Storage::Classes storage,
                Linkage::Spec linkage, std::vector<ptr<Attribute>>&& attrs, Function::Specs fs )
        : Decl( loc, name, storage, linkage ), mangleName(), attributes( std::move(attrs) ),
                funcSpec(fs), asmName() {}

        std::string scopedMangleName() const { return mangleName + "_" + std::to_string(scopeLevel); }

        /// Get type of this declaration. May be generated by subclass
        virtual const Type * get_type() const = 0;
        /// Set type of this declaration. May be verified by subclass
        virtual void set_type(Type *) = 0;

        const DeclWithType * accept( Visitor & v ) const override = 0;
private:
        DeclWithType * clone() const override = 0;
};

/// Object declaration `Foo foo = 42;`
class ObjectDecl final : public DeclWithType {
public:
        ptr<Type> type;
        ptr<Init> init;
        ptr<Expr> bitfieldWidth;

        ObjectDecl( const CodeLocation& loc, const std::string& name, Type* type, Init* init = nullptr,
                Storage::Classes storage = {}, Linkage::Spec linkage = Linkage::C, Expr* bitWd = nullptr,
                std::vector<ptr<Attribute>>&& attrs = {}, Function::Specs fs = {})
        : DeclWithType( loc, name, storage, linkage, std::move(attrs), fs ), type( type ),
          init( init ), bitfieldWidth( bitWd ) {}

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

        const DeclWithType * accept( Visitor& v ) const override { return v.visit( this ); }
private:
        ObjectDecl * clone() const override { return new ObjectDecl{ *this }; }

        /// Must be copied in ALL derived classes
        template<typename node_t>
        friend auto mutate(const node_t * node);
};

class FunctionDecl : public DeclWithType {
public:
        ptr<FunctionType> type;
        ptr<CompoundStmt> stmts;
        std::list< ptr<Expr> > withExprs;

        FunctionDecl( const CodeLocation & loc, const std::string &name, FunctionType * type,
                CompoundStmt * stmts, Storage::Classes storage = {}, Linkage::Spec linkage = Linkage::C,
                std::vector<ptr<Attribute>>&& attrs = {}, Function::Specs fs = {})
        : DeclWithType( loc, name, storage, linkage, std::move(attrs), fs ), type( type ),
          stmts( stmts ) {}

        const Type * get_type() const override { return type.get(); }
        void set_type(Type * t) override { type = strict_dynamic_cast< FunctionType* >( t ); }

        bool has_body() const { return stmts; }

        const DeclWithType * accept( Visitor &v ) const override { return v.visit( this ); }
private:
        FunctionDecl * clone() const override { return new FunctionDecl( *this ); }

        /// Must be copied in ALL derived classes
        template<typename node_t>
        friend auto mutate(const node_t * node);
};

/// Base class for named type aliases
class NamedTypeDecl : public Decl {
public:
        ptr<Type> base;
        std::vector<ptr<TypeDecl>> parameters;
        std::vector<ptr<DeclWithType>> assertions;

        NamedTypeDecl( const CodeLocation& loc, const std::string& name, Storage::Classes storage,
                Type* b, Linkage::Spec spec = Linkage::Cforall )
        : Decl( loc, name, storage, spec ), base( b ), parameters(), assertions() {}

        /// Produces a name for the kind of alias
        virtual std::string typeString() const = 0;

private:
        NamedTypeDecl* clone() const override = 0;
};

/// Cforall type variable: `dtype T`
class TypeDecl final : public NamedTypeDecl {
public:
        /// type variable variants. otype is a specialized dtype
        enum Kind { Dtype, Ftype, Ttype, NUMBER_OF_KINDS } kind;
        bool sized;
        ptr<Type> init;

        /// Data extracted from a type decl
        struct Data {
                Kind kind;
                bool isComplete;

                Data() : kind( (Kind)-1 ), isComplete( false ) {}
                Data( TypeDecl* d ) : kind( d->kind ), isComplete( d->sized ) {}
                Data( Kind k, bool c ) : kind( k ), isComplete( c ) {}
                Data( const Data& d1, const Data& d2 )
                : kind( d1.kind ), isComplete( d1.isComplete || d2.isComplete ) {}

                bool operator== ( const Data& o ) const {
                        return kind == o.kind && isComplete == o.isComplete;
                }
                bool operator!= ( const Data& o ) const { return !(*this == o); }
        };

        TypeDecl( const CodeLocation& loc, const std::string& name, Storage::Classes storage, Type* b,
                Kind k, bool s, Type* i = nullptr )
        : NamedTypeDecl( loc, name, storage, b ), kind( k ), sized( k == Ttype || s ), init( i ) {}

        std::string typeString() const override;
        /// Produces a name for generated code
        std::string genTypeString() const;

        const Decl * accept( Visitor & v ) const override { return v.visit( this ); }
private:
        TypeDecl * clone() const override { return new TypeDecl{ *this }; }

        /// Must be copied in ALL derived classes
        template<typename node_t>
        friend auto mutate(const node_t * node);
};

/// C-style typedef `typedef Foo Bar`
class TypedefDecl final : public NamedTypeDecl {
public:
        TypedefDecl( const CodeLocation& loc, const std::string& name, Storage::Classes storage,
                Type* b, Linkage::Spec spec = Linkage::Cforall )
        : NamedTypeDecl( loc, name, storage, b, spec ) {}

        std::string typeString() const override { return "typedef"; }

        const Decl * accept( Visitor & v ) const override { return v.visit( this ); }
private:
        TypedefDecl * clone() const override { return new TypedefDecl{ *this }; }

        /// Must be copied in ALL derived classes
        template<typename node_t>
        friend auto mutate(const node_t * node);
};

/// Aggregate type declaration base class
class AggregateDecl : public Decl {
public:
        std::vector<ptr<Decl>> members;
        std::vector<ptr<TypeDecl>> parameters;
        std::vector<ptr<Attribute>> attributes;
        bool body = false;
        readonly<AggregateDecl> parent = {};

        AggregateDecl( const CodeLocation& loc, const std::string& name,
                std::vector<ptr<Attribute>>&& attrs = {}, Linkage::Spec linkage = Linkage::Cforall )
        : Decl( loc, name, Storage::Classes{}, linkage ), members(), parameters(),
          attributes( std::move(attrs) ) {}

        AggregateDecl* set_body( bool b ) { body = b; return this; }

protected:
        /// Produces a name for the kind of aggregate
        virtual std::string typeString() const = 0;
};

/// struct declaration `struct Foo { ... };`
class StructDecl final : public AggregateDecl {
public:
        DeclarationNode::Aggregate kind;

        StructDecl( const CodeLocation& loc, const std::string& name,
                DeclarationNode::Aggregate kind = DeclarationNode::Struct,
                std::vector<ptr<Attribute>>&& attrs = {}, Linkage::Spec linkage = Linkage::Cforall )
        : AggregateDecl( loc, name, std::move(attrs), linkage ), kind( kind ) {}

        bool is_coroutine() { return kind == DeclarationNode::Coroutine; }
        bool is_monitor() { return kind == DeclarationNode::Monitor; }
        bool is_thread() { return kind == DeclarationNode::Thread; }

        const Decl * accept( Visitor & v ) const override { return v.visit( this ); }
private:
        StructDecl * clone() const override { return new StructDecl{ *this }; }

        /// Must be copied in ALL derived classes
        template<typename node_t>
        friend auto mutate(const node_t * node);

        std::string typeString() const override { return "struct"; }
};

/// union declaration `union Foo { ... };`
class UnionDecl final : public AggregateDecl {
public:
        UnionDecl( const CodeLocation& loc, const std::string& name,
                std::vector<ptr<Attribute>>&& attrs = {}, Linkage::Spec linkage = Linkage::Cforall )
        : AggregateDecl( loc, name, std::move(attrs), linkage ) {}

        const Decl * accept( Visitor& v ) const override { return v.visit( this ); }
private:
        UnionDecl * clone() const override { return new UnionDecl{ *this }; }

        /// Must be copied in ALL derived classes
        template<typename node_t>
        friend auto mutate(const node_t * node);

        std::string typeString() const override { return "union"; }
};

/// enum declaration `enum Foo { ... };`
class EnumDecl final : public AggregateDecl {
public:
        EnumDecl( const CodeLocation& loc, const std::string& name,
                std::vector<ptr<Attribute>>&& attrs = {}, Linkage::Spec linkage = Linkage::Cforall )
        : AggregateDecl( loc, name, std::move(attrs), linkage ), enumValues() {}

        /// gets the integer value for this enumerator, returning true iff value found
        bool valueOf( Decl* enumerator, long long& value ) const;

        const Decl * accept( Visitor & v ) const override { return v.visit( this ); }
private:
        EnumDecl * clone() const override { return new EnumDecl{ *this }; }

        /// Must be copied in ALL derived classes
        template<typename node_t>
        friend auto mutate(const node_t * node);

        std::string typeString() const override { return "enum"; }

        /// Map from names to enumerator values; kept private for lazy initialization
        mutable std::unordered_map< std::string, long long > enumValues;
};

/// trait declaration `trait Foo( ... ) { ... };`
class TraitDecl final : public AggregateDecl {
public:
        TraitDecl( const CodeLocation& loc, const std::string& name,
                std::vector<ptr<Attribute>>&& attrs = {}, Linkage::Spec linkage = Linkage::Cforall )
        : AggregateDecl( loc, name, std::move(attrs), linkage ) {}

        const Decl * accept( Visitor & v ) const override { return v.visit( this ); }
private:
        TraitDecl * clone() const override { return new TraitDecl{ *this }; }

        /// Must be copied in ALL derived classes
        template<typename node_t>
        friend auto mutate(const node_t * node);

        std::string typeString() const override { return "trait"; }
};

class AsmDecl : public Decl {
public:
        ptr<AsmStmt> stmt;

        AsmDecl( const CodeLocation & loc, AsmStmt *stmt )
        : Decl( loc, "", {}, {} ), stmt(stmt) {}

        const AsmDecl * accept( Visitor &v ) const override { return v.visit( this ); }
private:
        AsmDecl *clone() const override { return new AsmDecl( *this ); }

        /// Must be copied in ALL derived classes
        template<typename node_t>
        friend auto mutate(const node_t * node);
};

class StaticAssertDecl : public Decl {
public:
        ptr<Expr> condition;
        ptr<ConstantExpr> msg;   // string literal

        StaticAssertDecl( const CodeLocation & loc, const Expr * condition, const ConstantExpr * msg )
        : Decl( loc, "", {}, {} ), condition( condition ), msg( msg ) {}

        const StaticAssertDecl * accept( Visitor &v ) const override { return v.visit( this ); }
private:
        StaticAssertDecl * clone() const override { return new StaticAssertDecl( *this ); }

        /// Must be copied in ALL derived classes
        template<typename node_t>
        friend auto mutate(const node_t * node);
};

//=================================================================================================
/// This disgusting and giant piece of boiler-plate is here to solve a cyclic dependency
/// remove only if there is a better solution
/// The problem is that ast::ptr< ... > uses increment/decrement which won't work well with
/// forward declarations
inline void increment( const class Decl * node, Node::ref_type ref ) { node->increment(ref); }
inline void decrement( const class Decl * node, Node::ref_type ref ) { node->decrement(ref); }
inline void increment( const class DeclWithType * node, Node::ref_type ref ) { node->increment(ref); }
inline void decrement( const class DeclWithType * node, Node::ref_type ref ) { node->decrement(ref); }
inline void increment( const class ObjectDecl * node, Node::ref_type ref ) { node->increment(ref); }
inline void decrement( const class ObjectDecl * node, Node::ref_type ref ) { node->decrement(ref); }
inline void increment( const class FunctionDecl * node, Node::ref_type ref ) { node->increment(ref); }
inline void decrement( const class FunctionDecl * node, Node::ref_type ref ) { node->decrement(ref); }
inline void increment( const class AggregateDecl * node, Node::ref_type ref ) { node->increment(ref); }
inline void decrement( const class AggregateDecl * node, Node::ref_type ref ) { node->decrement(ref); }
inline void increment( const class StructDecl * node, Node::ref_type ref ) { node->increment(ref); }
inline void decrement( const class StructDecl * node, Node::ref_type ref ) { node->decrement(ref); }
inline void increment( const class UnionDecl * node, Node::ref_type ref ) { node->increment(ref); }
inline void decrement( const class UnionDecl * node, Node::ref_type ref ) { node->decrement(ref); }
inline void increment( const class EnumDecl * node, Node::ref_type ref ) { node->increment(ref); }
inline void decrement( const class EnumDecl * node, Node::ref_type ref ) { node->decrement(ref); }
inline void increment( const class TraitDecl * node, Node::ref_type ref ) { node->increment(ref); }
inline void decrement( const class TraitDecl * node, Node::ref_type ref ) { node->decrement(ref); }
inline void increment( const class NamedTypeDecl * node, Node::ref_type ref ) { node->increment(ref); }
inline void decrement( const class NamedTypeDecl * node, Node::ref_type ref ) { node->decrement(ref); }
inline void increment( const class TypeDecl * node, Node::ref_type ref ) { node->increment(ref); }
inline void decrement( const class TypeDecl * node, Node::ref_type ref ) { node->decrement(ref); }
inline void increment( const class TypedefDecl * node, Node::ref_type ref ) { node->increment(ref); }
inline void decrement( const class TypedefDecl * node, Node::ref_type ref ) { node->decrement(ref); }
inline void increment( const class AsmDecl * node, Node::ref_type ref ) { node->increment(ref); }
inline void decrement( const class AsmDecl * node, Node::ref_type ref ) { node->decrement(ref); }
inline void increment( const class StaticAssertDecl * node, Node::ref_type ref ) { node->increment(ref); }
inline void decrement( const class StaticAssertDecl * node, Node::ref_type ref ) { node->decrement(ref); }

}

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