source: libcfa/src/memory.cfa@ 1f8f5a7

//
// 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.
//
// memory.cfa -- Memory Management Tools for CFA
//
// Author           : Andrew Beach
// Created On       : Tue Jun  2 16:48:00 2020
// Last Modified By : Andrew Beach
// Last Modified On : Tue Jun  3 12:30:00 2020
// Update Count     : 0
//

#include "memory.hfa"
#include "stdlib.hfa"

// Internal data object.
forall(T & | sized(T), Args... | { void ?{}(T &, Args); })
void ?{}(counter_data(T) & this, Args args) {
        (this.counter){1};
        (this.object){args};
}

forall(T & | sized(T) | { void ^?{}(T &); })
void ^?{}(counter_data(T) & this) {
        assert(0 == this.counter);
        ^(this.object){};
}

// This is one of many pointers keeping this alive.
forall(T & | sized(T))
void ?{}(counter_ptr(T) & this) {
        this.data = 0p;
}

forall(T & | sized(T))
void ?{}(counter_ptr(T) & this, zero_t) {
        this.data = 0p;
}

forall(T & | sized(T) | { void ^?{}(T &); })
static void internal_decrement(counter_ptr(T) & this) {
        if (this.data && 0 == --this.data->counter) {
                delete(this.data);
        }
}

forall(T & | sized(T))
static void internal_copy(counter_ptr(T) & this, counter_ptr(T) & that) {
        this.data = that.data;
        if (this.data) {
                ++this.data->counter;
        }
}

forall(T & | sized(T) | { void ^?{}(T &); })
void ?{}(counter_ptr(T) & this, counter_ptr(T) that) {
        // `that` is a copy but it should have neither a constructor
        // nor destructor run on it so it shouldn't need adjustment.
        internal_decrement(this);
        internal_copy(this, that);
}

forall(T & | sized(T), Args... | { void ?{}(T&, Args); })
void ?{}(counter_ptr(T) & this, Args args) {
        this.data = (counter_data(T)*)new(args);
}

forall(T & | sized(T) | { void ^?{}(T &); })
void ^?{}(counter_ptr(T) & this) {
        internal_decrement(this);
}

forall(T & | sized(T))
T & *?(counter_ptr(T) & this) {
        return *((this.data) ? &this.data->object : 0p);
}

forall(T & | sized(T) | { void ^?{}(T &); })
void ?=?(counter_ptr(T) & this, counter_ptr(T) that) {
        if (this.data != that.data) {
                internal_decrement(this);
                internal_copy(this, that);
        }
}

forall(T & | sized(T) | { void ^?{}(T &); })
void ?=?(counter_ptr(T) & this, zero_t) {
        internal_decrement(this);
        this.data = 0p;
}

forall(T & | sized(T))
int ?==?(counter_ptr(T) const & this, counter_ptr(T) const & that) {
        return this.data == that.data;
}

forall(T & | sized(T))
int ?!=?(counter_ptr(T) const & this, counter_ptr(T) const & that) {
        return !?==?(this, that);
}

forall(T & | sized(T))
int ?==?(counter_ptr(T) const & this, zero_t) {
        return this.data == 0;
}

forall(T & | sized(T))
int ?!=?(counter_ptr(T) const & this, zero_t) {
        return !?==?(this, (zero_t)0);
}

// This is the only pointer that keeps this alive.
forall(T &)
void ?{}(unique_ptr(T) & this) {
        this.data = 0p;
}

forall(T &)
void ?{}(unique_ptr(T) & this, zero_t) {
        this.data = 0p;
}

forall(T & | sized(T), Args... | { void ?{}(T &, Args); })
void ?{}(unique_ptr(T) & this, Args args) {
        this.data = (T *)new(args);
}

forall(T & | { void ^?{}(T &); })
void ^?{}(unique_ptr(T) & this) {
        delete(this.data);
}

forall(T &)
T & *?(unique_ptr(T) & this) {
        return *this.data;
}

forall(T & | { void ^?{}(T &); })
void ?=?(unique_ptr(T) & this, zero_t) {
        delete(this.data);
        this.data = 0p;
}

forall(T & | { void ^?{}(T &); })
void move(unique_ptr(T) & this, unique_ptr(T) & that) {
        delete(this.data);
        this.data = that.data;
        that.data = 0p;
}

forall(T &)
int ?==?(unique_ptr(T) const & this, unique_ptr(T) const & that) {
        return this.data == that.data;
}

forall(T &)
int ?!=?(unique_ptr(T) const & this, unique_ptr(T) const & that) {
        return !?==?(this, that);
}

forall(T &)
int ?==?(unique_ptr(T) const & this, zero_t) {
        return this.data == 0;
}

forall(T &)
int ?!=?(unique_ptr(T) const & this, zero_t) {
        return !?==?(this, (zero_t)0);
}