#include "ref.h"
#include "sym.h"
#include <stdio.h>
#include <stdlib.h>

void ref_queue_construct(RefQueue* queue)
{
    const size_t start_capacity = 128;
    *queue = (RefQueue) {
        .data = malloc(sizeof(Ref) * start_capacity),
        .capacity = start_capacity,
        .back = 0,
        .front = 0,
    };
}

void ref_queue_destroy(RefQueue* queue)
{
    free(queue->data);
}

void ref_queue_push(RefQueue* queue, const Sym* sym, uint16_t offset)
{
    if (queue->front + 1 > queue->capacity) {
        queue->capacity *= 2;
        queue->data = realloc(queue->data, sizeof(Ref) * queue->capacity);
    }
    queue->data[queue->front++] = (Ref) { sym, offset };
}

Ref ref_queue_pop(RefQueue* queue)
{
    if (queue->back == queue->front) {
        fprintf(stderr, "panic: queue underflow\n");
        exit(1);
    }
    return queue->data[queue->back++];
}

size_t ref_queue_size(const RefQueue* queue)
{
    return queue->front - queue->back;
}