source: libcfa/src/bits/collections.hfa @ 3267041

//
// Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// bits/collections.hfa -- Intrusive generic collections
//
// Author           : Thierry Delisle
// Created On       : Tue Oct 31 16:38:50 2017
// Last Modified By : Peter A. Buhr
// Last Modified On : Wed Aug 30 21:26:39 2023
// Update Count     : 30

#pragma once

#include "bits/align.hfa"
#include "bits/defs.hfa"
#include <stdio.h>
//-----------------------------------------------------------------------------
// Array
//-----------------------------------------------------------------------------

#ifdef __cforall
        forall(T &)
#else
        #define T void
#endif
struct __small_array {
        T *           data;
        __lock_size_t size;
};
#undef T

#ifdef __cforall
        #define __small_array_t(T) __small_array(T)
#else
        #define __small_array_t(T) __small_array
#endif

#ifdef __cforall
        // forall(T | sized(T))
        // static inline void ?{}(__small_array(T) & this) {}

        forall(T & | sized(T))
        static inline T & ?[?]( __small_array(T) & this, __lock_size_t idx ) {
                return ((typeof(this.data))this.data)[idx];
        }

        forall(T & | sized(T))
        static inline T & ?[?]( const __small_array(T) & this, __lock_size_t idx ) {
                return ((typeof(this.data))this.data)[idx];
        }

        forall(T &)
        static inline T * begin( const __small_array(T) & this ) {
                return ((typeof(this.data))this.data);
        }

        forall(T & | sized(T))
        static inline T * end( const __small_array(T) & this ) {
                return ((typeof(this.data))this.data) + this.size;
        }
#endif

//-----------------------------------------------------------------------------
// Node Base
//-----------------------------------------------------------------------------

#ifdef __cforall
        forall( T & )
        trait is_node {
                T *& get_next( T & );
        };
#endif

//-----------------------------------------------------------------------------
// Stack
//-----------------------------------------------------------------------------
#ifdef __cforall
        forall(T &)
        #define __elem_t T
#else
        #define __elem_t void
#endif
struct __stack {
        __elem_t * top;
};
#undef __elem_t

#ifdef __cforall
#define __stack_t(T) __stack(T)
#else
#define __stack_t(T) struct __stack
#endif

#ifdef __cforall
        forall(T &)
        static inline void ?{}( __stack(T) & this ) {
                (this.top){ 0p };
        }

        static inline forall( T & | is_node(T) ) {
                void push( __stack(T) & this, T * val ) {
                        verify( !get_next( *val ) );
                        get_next( *val ) = this.top;
                        this.top = val;
                }

                T * pop( __stack(T) & this ) {
                        T * top = this.top;
                        if( top ) {
                                this.top = get_next( *top );
                                get_next( *top ) = 0p;
                        }
                        return top;
                }

                int ?!=?( const __stack(T) & this, __attribute__((unused)) zero_t zero ) {
                        return this.top != 0;
                }
        }
#endif

//-----------------------------------------------------------------------------
// Queue
//-----------------------------------------------------------------------------
#ifdef __cforall
        forall(T &)
        #define __elem_t T
#else
        #define __elem_t void
#endif
struct __queue {
        __elem_t * head;
        __elem_t ** tail;
};
#undef __elem_t

#ifdef __cforall
#define __queue_t(T) __queue(T)
#else
#define __queue_t(T) struct __queue
#endif

#ifdef __cforall
        static inline forall( T & | is_node(T) ) {
                void ?{}( __queue(T) & this ) with( this ) {
                        (this.head){ 1p };
                        (this.tail){ &this.head };
                        verify(*this.tail == 1p);
                }

                void append( __queue(T) & this, T * val ) with(this) {
                        verify(get_next( *val ) == 0p);
                        verify(this.tail != 0p);
                        verify(*this.tail == 1p);
                        *this.tail = val;
                        this.tail = &get_next( *val );
                        *this.tail = 1p;
                }

                T * peek( __queue(T) & this ) {
                        verify(*this.tail == 1p);
                        T * frontnode = this.head;
                        if( frontnode != 1p ) {
                                verify(*this.tail == 1p);
                                return frontnode;
                        }
                        verify(*this.tail == 1p);
                        return 0p;
                }

                T * pop_head( __queue(T) & this ) {
                        verify(*this.tail == 1p);
                        T * _head = this.head;
                        if( _head != 1p ) {
                                this.head = get_next( *_head );
                                if( get_next( *_head ) == 1p ) {
                                        this.tail = &this.head;
                                }
                                get_next( *_head ) = 0p;
                                verify(*this.tail == 1p);
                                verify( get_next(*_head) == 0p );
                                return _head;
                        }
                        verify(*this.tail == 1p);
                        return 0p;
                }

                T * remove( __queue(T) & this, T ** it ) with( this ) {
                        T * val = *it;
                        verify( val );

                        (*it) = get_next( *val );

                        if( this.tail == &get_next( *val ) ) {
                                this.tail = it;
                        }

                        get_next( *val ) = 0p;

                        verify( (this.head == 1p) == (&this.head == this.tail) );
                        verify( *this.tail == 1p );
                        return val;
                }

                int ?!=?( const __queue(T) & this, __attribute__((unused)) zero_t zero ) {
                        return this.head != 1p;
                }
        }
#endif


//-----------------------------------------------------------------------------
// Doubly Linked List
//-----------------------------------------------------------------------------
#ifdef __cforall
        forall(T &)
        #define __elem_t T
        #define __getter_t * [__elem_t * & next, __elem_t * & prev] ( __elem_t & )
#else
        typedef void (*__generit_c_getter_t)();
        #define __elem_t void
        #define __getter_t __generit_c_getter_t
#endif
struct __dllist {
        __elem_t * head;
        __getter_t __get;
};
#undef __elem_t
#undef __getter_t

#ifdef __cforall
#define __dllist_t(T) __dllist(T)
#else
#define __dllist_t(T) struct __dllist
#endif

#ifdef __cforall
        forall(T & )
        static inline [void] ?{}( __dllist(T) & this, * [T * & next, T * & prev] ( T & ) __get ) {
                (this.head){ 0p };
                this.__get = __get;
        }

        #define next 0
        #define prev 1
        static inline forall(T &) {
                void push_front( __dllist(T) & this, T & node ) with( this ) {
                        verify(__get);
                        if ( this.head ) {
                                __get( node ).next = this.head;
                                __get( node ).prev = __get( *this.head ).prev;
                                // inserted node must be consistent before it is seen
                                // prevent code movement across barrier
                                asm( "" : : : "memory" );
                                __get( *this.head ).prev = &node;
                                T & _prev = *__get( node ).prev;
                                __get( _prev ).next = &node;
                        } else {
                                __get( node ).next = &node;
                                __get( node ).prev = &node;
                        }

                        // prevent code movement across barrier
                        asm( "" : : : "memory" );
                        this.head = &node;
                }

                void remove( __dllist(T) & this, T & node ) with( this ) {
                        verify(__get);
                        if ( &node == this.head ) {
                                if ( __get( *this.head ).next == this.head ) {
                                        this.head = 0p;
                                } else {
                                        this.head = __get( *this.head ).next;
                                }
                        }
                        __get( *__get( node ).next ).prev = __get( node ).prev;
                        __get( *__get( node ).prev ).next = __get( node ).next;
                        __get( node ).next = 0p;
                        __get( node ).prev = 0p;
                }

                int ?!=?( const __dllist(T) & this, __attribute__((unused)) zero_t zero ) {
                        return this.head != 0;
                }

                void move_to_front( __dllist(T) & src, __dllist(T) & dst, T & node ) {
                        remove    (src, node);
                        push_front(dst, node);
                }
        }
        #undef next
        #undef prev
#endif

//-----------------------------------------------------------------------------
// Tools
//-----------------------------------------------------------------------------
#ifdef __cforall

#endif

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