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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#ifndef Py_INTERNAL_OPCODE_UTILS_H
#define Py_INTERNAL_OPCODE_UTILS_H
#ifdef __cplusplus
extern "C" {
#endif

#ifndef Py_BUILD_CORE
#  error "this header requires Py_BUILD_CORE define"
#endif

#include "opcode_ids.h"

#define MAX_REAL_OPCODE 254

#define IS_WITHIN_OPCODE_RANGE(opcode) \
        (((opcode) >= 0 && (opcode) <= MAX_REAL_OPCODE) || \
         IS_PSEUDO_INSTR(opcode))

#define IS_BLOCK_PUSH_OPCODE(opcode) \
        ((opcode) == SETUP_FINALLY || \
         (opcode) == SETUP_WITH || \
         (opcode) == SETUP_CLEANUP)

#define HAS_TARGET(opcode) \
        (OPCODE_HAS_JUMP(opcode) || IS_BLOCK_PUSH_OPCODE(opcode))

/* opcodes that must be last in the basicblock */
#define IS_TERMINATOR_OPCODE(opcode) \
        (OPCODE_HAS_JUMP(opcode) || IS_SCOPE_EXIT_OPCODE(opcode))

/* opcodes which are not emitted in codegen stage, only by the assembler */
#define IS_ASSEMBLER_OPCODE(opcode) \
        ((opcode) == JUMP_FORWARD || \
         (opcode) == JUMP_BACKWARD || \
         (opcode) == JUMP_BACKWARD_NO_INTERRUPT)

#define IS_BACKWARDS_JUMP_OPCODE(opcode) \
        ((opcode) == JUMP_BACKWARD || \
         (opcode) == JUMP_BACKWARD_NO_INTERRUPT)

#define IS_UNCONDITIONAL_JUMP_OPCODE(opcode) \
        ((opcode) == JUMP || \
         (opcode) == JUMP_NO_INTERRUPT || \
         (opcode) == JUMP_FORWARD || \
         (opcode) == JUMP_BACKWARD || \
         (opcode) == JUMP_BACKWARD_NO_INTERRUPT)

#define IS_SCOPE_EXIT_OPCODE(opcode) \
        ((opcode) == RETURN_VALUE || \
         (opcode) == RETURN_CONST || \
         (opcode) == RAISE_VARARGS || \
         (opcode) == RERAISE)


/* Flags used in the oparg for MAKE_FUNCTION */
#define MAKE_FUNCTION_DEFAULTS    0x01
#define MAKE_FUNCTION_KWDEFAULTS  0x02
#define MAKE_FUNCTION_ANNOTATIONS 0x04
#define MAKE_FUNCTION_CLOSURE     0x08

/* Values used in the oparg for RESUME */
#define RESUME_AT_FUNC_START 0
#define RESUME_AFTER_YIELD 1
#define RESUME_AFTER_YIELD_FROM 2
#define RESUME_AFTER_AWAIT 3

#define RESUME_OPARG_LOCATION_MASK 0x3
#define RESUME_OPARG_DEPTH1_MASK 0x4

#ifdef __cplusplus
}
#endif
#endif /* !Py_INTERNAL_OPCODE_UTILS_H */