晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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/*
   +----------------------------------------------------------------------+
   | Zend Engine                                                          |
   +----------------------------------------------------------------------+
   | Copyright (c) The PHP Group                                          |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.01 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | https://www.php.net/license/3_01.txt                                 |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Authors: Andy Wingo <wingo@igalia.com>                               |
   +----------------------------------------------------------------------+
*/

#ifndef _ZEND_WORKLIST_H_
#define _ZEND_WORKLIST_H_

#include "zend_arena.h"
#include "zend_bitset.h"

typedef struct _zend_worklist_stack {
	int *buf;
	int len;
	int capacity;
} zend_worklist_stack;

#define ZEND_WORKLIST_STACK_ALLOCA(s, _len, use_heap) do { \
		(s)->buf = (int*)do_alloca(sizeof(int) * _len, use_heap); \
		(s)->len = 0; \
		(s)->capacity = _len; \
	} while (0)

#define ZEND_WORKLIST_STACK_FREE_ALLOCA(s, use_heap) \
	free_alloca((s)->buf, use_heap)

static inline void zend_worklist_stack_prepare(zend_arena **arena, zend_worklist_stack *stack, int len)
{
	ZEND_ASSERT(len >= 0);

	stack->buf = (int*)zend_arena_calloc(arena, sizeof(*stack->buf), len);
	stack->len = 0;
	stack->capacity = len;
}

static inline void zend_worklist_stack_push(zend_worklist_stack *stack, int i)
{
	ZEND_ASSERT(stack->len < stack->capacity);
	stack->buf[stack->len++] = i;
}

static inline int zend_worklist_stack_peek(const zend_worklist_stack *stack)
{
	ZEND_ASSERT(stack->len);
	return stack->buf[stack->len - 1];
}

static inline int zend_worklist_stack_pop(zend_worklist_stack *stack)
{
	ZEND_ASSERT(stack->len);
	return stack->buf[--stack->len];
}

typedef struct _zend_worklist {
	zend_bitset visited;
	zend_worklist_stack stack;
} zend_worklist;

#define ZEND_WORKLIST_ALLOCA(w, _len, use_heap) do { \
		(w)->stack.buf = (int*)do_alloca(ZEND_MM_ALIGNED_SIZE(sizeof(int) * _len) + sizeof(zend_ulong) * zend_bitset_len(_len), use_heap); \
		(w)->stack.len = 0; \
		(w)->stack.capacity = _len; \
		(w)->visited = (zend_bitset)((char*)(w)->stack.buf + ZEND_MM_ALIGNED_SIZE(sizeof(int) * _len)); \
		memset((w)->visited, 0, sizeof(zend_ulong) * zend_bitset_len(_len)); \
	} while (0)

#define ZEND_WORKLIST_FREE_ALLOCA(w, use_heap) \
	free_alloca((w)->stack.buf, use_heap)

static inline void zend_worklist_prepare(zend_arena **arena, zend_worklist *worklist, int len)
{
	ZEND_ASSERT(len >= 0);
	worklist->visited = (zend_bitset)zend_arena_calloc(arena, sizeof(zend_ulong), zend_bitset_len(len));
	zend_worklist_stack_prepare(arena, &worklist->stack, len);
}

static inline int zend_worklist_len(const zend_worklist *worklist)
{
	return worklist->stack.len;
}

static inline bool zend_worklist_push(zend_worklist *worklist, int i)
{
	ZEND_ASSERT(i >= 0 && i < worklist->stack.capacity);

	if (zend_bitset_in(worklist->visited, i)) {
		return 0;
	}

	zend_bitset_incl(worklist->visited, i);
	zend_worklist_stack_push(&worklist->stack, i);
	return 1;
}

static inline int zend_worklist_peek(const zend_worklist *worklist)
{
	return zend_worklist_stack_peek(&worklist->stack);
}

static inline int zend_worklist_pop(zend_worklist *worklist)
{
	/* Does not clear visited flag */
	return zend_worklist_stack_pop(&worklist->stack);
}

#endif /* _ZEND_WORKLIST_H_ */