/**
 * Compiler implementation of the
 * $(LINK2 http://www.dlang.org, D programming language).
 *
 * Copyright:   Copyright (C) 1987-1998 by Symantec
 *              Copyright (c) 2000-2017 by Digital Mars, All Rights Reserved
 * Authors:     $(LINK2 http://www.digitalmars.com, Walter Bright)
 * License:     $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
 * Source:      $(LINK2 https://github.com/dlang/dmd/blob/master/src/ddmd/backend/code.c, backend/code.c)
 */

#if !SPP

#include        <stdio.h>
#include        <string.h>
#include        <time.h>

#include        "cc.h"
#include        "el.h"
#include        "code.h"
#include        "global.h"

code *code_list = NULL;

/************************************
 * Allocate a chunk of code's and add them to
 * code_list.
 */
code *code_chunk_alloc()
{
    const size_t n = 4096 / sizeof(code);
    code *chunk = (code *)mem_fmalloc(n * sizeof(code));
    for (size_t i = 0; i < n - 1; ++i)
    {
        code_next(&chunk[i]) = &chunk[i + 1];
    }
    code_next(&chunk[n - 1]) = NULL;
    code_list = chunk;
    return chunk;
}

/*****************
 * Allocate code
 */

code *code_calloc()
{
    //printf("code %d\n", sizeof(code));
    code *c = code_list ? code_list : code_chunk_alloc();
    code_list = code_next(c);
    MEMCLEAR(c, sizeof(*c));

    //dbg_printf("code_calloc: %p\n",c);
    return c;
}


/*****************
 * Free code
 */

void code_free(code *cstart)
{
    if (cstart)
    {
        code *c = cstart;
        while (1)
        {
            if (c->Iop == ASM)
            {
                mem_free(c->IEV1.as.bytes);
            }
            code *cnext = code_next(c);
            if (!cnext)
                break;
            c = cnext;
        }
        code_next(c) = code_list;
        code_list = cstart;
    }
}

/*****************
 * Terminate code
 */

void code_term()
{
#if TERMCODE
    code *cn;
    int count = 0;

    while (code_list)
    {   cn = code_next(code_list);
        //mem_ffree(code_list);
        code_list = cn;
        count++;
    }
#ifdef DEBUG
    printf("Max # of codes = %d\n",count);
#endif
#else
#ifdef DEBUG
    int count = 0;

    for (code *cn = code_list; cn; cn = code_next(cn))
        count++;
    printf("Max # of codes = %d\n",count);
#endif
#endif
}

#endif // !SPP
