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。 .
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/*
   +----------------------------------------------------------------------+
   | Zend Engine                                                          |
   +----------------------------------------------------------------------+
   | Copyright (c) Zend Technologies Ltd. (http://www.zend.com)           |
   +----------------------------------------------------------------------+
   | This source file is subject to version 2.00 of the Zend license,     |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | http://www.zend.com/license/2_00.txt.                                |
   | If you did not receive a copy of the Zend license and are unable to  |
   | obtain it through the world-wide-web, please send a note to          |
   | license@zend.com so we can mail you a copy immediately.              |
   +----------------------------------------------------------------------+
   | Authors: Andi Gutmans <andi@php.net>                                 |
   |          Zeev Suraski <zeev@php.net>                                 |
   |          Dmitry Stogov <dmitry@php.net>                              |
   +----------------------------------------------------------------------+
*/

#ifndef ZEND_VARIABLES_H
#define ZEND_VARIABLES_H

#include "zend_types.h"
#include "zend_gc.h"

BEGIN_EXTERN_C()

ZEND_API void ZEND_FASTCALL rc_dtor_func(zend_refcounted *p);
ZEND_API void ZEND_FASTCALL zval_copy_ctor_func(zval *zvalue);

static zend_always_inline void zval_ptr_dtor_nogc(zval *zval_ptr)
{
	if (Z_REFCOUNTED_P(zval_ptr) && !Z_DELREF_P(zval_ptr)) {
		rc_dtor_func(Z_COUNTED_P(zval_ptr));
	}
}

static zend_always_inline void i_zval_ptr_dtor(zval *zval_ptr)
{
	if (Z_REFCOUNTED_P(zval_ptr)) {
		zend_refcounted *ref = Z_COUNTED_P(zval_ptr);
		if (!GC_DELREF(ref)) {
			rc_dtor_func(ref);
		} else {
			gc_check_possible_root(ref);
		}
	}
}

static zend_always_inline void zval_copy_ctor(zval *zvalue)
{
	if (Z_TYPE_P(zvalue) == IS_ARRAY) {
		ZVAL_ARR(zvalue, zend_array_dup(Z_ARR_P(zvalue)));
	} else if (Z_REFCOUNTED_P(zvalue)) {
		Z_ADDREF_P(zvalue);
	}
}

static zend_always_inline void zval_opt_copy_ctor(zval *zvalue)
{
	if (Z_OPT_TYPE_P(zvalue) == IS_ARRAY) {
		ZVAL_ARR(zvalue, zend_array_dup(Z_ARR_P(zvalue)));
	} else if (Z_OPT_REFCOUNTED_P(zvalue)) {
		Z_ADDREF_P(zvalue);
	}
}

static zend_always_inline void zval_ptr_dtor_str(zval *zval_ptr)
{
	if (Z_REFCOUNTED_P(zval_ptr) && !Z_DELREF_P(zval_ptr)) {
		ZEND_ASSERT(Z_TYPE_P(zval_ptr) == IS_STRING);
		ZEND_ASSERT(!ZSTR_IS_INTERNED(Z_STR_P(zval_ptr)));
		ZEND_ASSERT(!(GC_FLAGS(Z_STR_P(zval_ptr)) & IS_STR_PERSISTENT));
		efree(Z_STR_P(zval_ptr));
	}
}

ZEND_API void zval_ptr_dtor(zval *zval_ptr);
ZEND_API void zval_internal_ptr_dtor(zval *zvalue);

/* Kept for compatibility */
#define zval_dtor(zvalue) zval_ptr_dtor_nogc(zvalue)
#define zval_internal_dtor(zvalue) zval_internal_ptr_dtor(zvalue)
#define zval_dtor_func rc_dtor_func
#define zval_ptr_dtor_wrapper zval_ptr_dtor
#define zval_internal_ptr_dtor_wrapper zval_internal_ptr_dtor

ZEND_API void zval_add_ref(zval *p);

END_EXTERN_C()

#define ZVAL_PTR_DTOR zval_ptr_dtor
#define ZVAL_INTERNAL_PTR_DTOR zval_internal_ptr_dtor

#endif

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