/*
 * Copyright (c) 2020 The DragonFly Project.  All rights reserved.
 *
 * This code is derived from software contributed to The DragonFly Project
 * by Matthew Dillon <dillon@backplane.com>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name of The DragonFly Project nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific, prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "flame.h"

typedef struct elm {
        struct elm *next;
        uint64_t        hv;
        long            ticks;
        const char      *id;
        size_t          idlen;
} elm_t;

#define MAXELM  256
#define HSIZE   (1024*1024)
#define HMASK   (HSIZE - 1)

static elm_t *elm_lookup(const char *s);
static void flame_process_dump(void);

static long total_ticks;

void
flame_process_loop(void)
{
        char buf[4096];
        char *s;
        elm_t *elm;
        /*elm_t *elms[MAXELM];*/
        int n;

        while (fgets(buf, sizeof(buf), stdin) != NULL) {
                n = 0;

                s = strtok(buf, " \t\n\r");
                if (s == NULL || strchr(s, '/') == NULL)
                        continue;
                while ((s = strtok(NULL, " \t\n\r")) != NULL) {
                        elm = elm_lookup(s);
                        /*elms[n] = elm;*/
                        ++elm->ticks;

                        if (n == MAXELM)
                                break;
                        ++n;
                }
                ++total_ticks;
                /* more processing later */
        }
        flame_process_dump();
}

static elm_t *elm_hash_array[HSIZE];

static elm_t *
elm_lookup(const char *s)
{
        size_t len;
        uint64_t hv;
        elm_t **scanp;
        elm_t *scan;

        if (s[0] == '0' && s[1] == 'x') {
                hv = strtoul(s, NULL, 0);
                if (hv < 0x8000000000000000LU)
                        s = "__userland__";
        }

        hv = 0;
        for (len = 0; s[len] && s[len] != '+' && s[len] != '('; ++len)
                hv = hv * 13 ^ (uint8_t)s[len];

        scanp = &elm_hash_array[hv % HSIZE];
        while ((scan = *scanp) != NULL) {
                if (scan->hv == hv && len == scan->idlen &&
                    bcmp(s, scan->id, len) == 0) {
                        return scan;
                }
                scanp = &scan->next;
        }
        scan = malloc(sizeof(elm_t));
        bzero(scan, sizeof(*scan));
        *scanp = scan;
        scan->hv = hv;
        scan->id = strdup(s);
        scan->idlen = len;

        return scan;
}

static void
flame_process_dump(void)
{
        elm_t *elm;
        int i;

        for (i = 0; i < HSIZE; ++i) {
                for (elm = elm_hash_array[i]; elm; elm = elm->next) {
                        printf("%-6ld %6.3f%% %*.*s\n",
                                elm->ticks,
                                (double)elm->ticks * 100.0 /
                                 (double)total_ticks,
                                (int)elm->idlen, (int)elm->idlen, elm->id);
                }
        }
}