rarray_value.pdf

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1. Array#+ ͱ Array#concatͷ ϝϞϦͷ࢖͍ํͷҧ͍ @morihirok

2. ഁյతϝιουͱඇഁյతϝ ιου • ඇഁյతϝιου͸Ϩγʔόͷঢ়ଶʹӨڹΛٴ΅ ͢ • Array#+ ͸ඇഁյతϝιου • ഁյతϝιου͸Ϩγʔόͷঢ়ଶʹӨڹΛٴ΅͢

   • Array#concat͸ഁյతϝιου

3. #+ ͱ #concat ͷҧ͍ ary1 = ['hoge', 'fuga'] ary2 =

   ['foo', ‘bar'] ary3 = ary1 + ary2 p ary3 => ["hoge", "fuga", "foo", "bar"] p ary1 => ["hoge", “fuga"] ary1.concat(ary2) p ary1 => ["hoge", "fuga", "foo", "bar"]

4. ඇഁյతϝιου͸ϝϞϦޮ཰ ͕ѱ͍ͷͰ͸ʁ ary1 = ['hoge', 'fuga'] ary2 = ['foo', ‘bar']

   ary3 = ary1 + ary2 p ary3 => ["hoge", "fuga", "foo", "bar"] p ary1 => ["hoge", “fuga"] ary1.concat(ary2) p ary1 => ["hoge", "fuga", "foo", "bar"] ৽ͨͳ഑ྻΛੜ੒͍ͯ͠Δ

5. ͱ͍͏Θ͚Ͱௐࠪ ary1 = ['hoge', 'fuga'] ary2 = ['foo', 'bar'] ary1.object_id

   => 180 ary1.map(&:object_id) => [200, 220] ary2.object_id => 240 ary2.map(&:object_id) => [260, 280]

6. Array#concat ͷ৔߹ p ary1.object_id => 180 p ary1.map(&:object_id) => [200,

   220] p ary2.map(&:object_id) => [260, 280] ary1.concat(ary2) p ary1.object_id => 180 p ary1.map(&:object_id) => [200, 220, 260, 280] ಉҰͷΦϒδΣΫτΛอ࣋͢Δ
   ഑ྻ͕׬੒

7. Array#+ ͷ৔߹ p ary1.map(&:object_id) => [200, 220] p ary2.map(&:object_id) =>

   [260, 280] ary3 = ary1 + ary2 ary3.object_id => 300 ary3.map(&:object_id) => [200, 220, 260, 280] ಉҰͷΦϒδΣΫτΛอ࣋͢Δ
   ഑ྻ͕׬੒
   ৽͍͠ΦϒδΣΫτ͕ੜ੒͞Ε
   ͦΕΛอ࣋͢Δ഑ྻ͕Ͱ͖Δͱ
   ࢥ͍ͬͯͨʜ

8. Arrayʹ͍ͭͯ צҧ͍͍ͯ͠Δ͔΋͠Εͳ͍

9. Arrayͷߏ଄ମʹ͍ͭͯௐ΂Δ struct RArray { struct RBasic basic; union { struct

   { long len; union { long capa; #if defined(__clang__) /* <- clang++ is sane */ || \ !defined(__cplusplus) /* <- C99 is sane */ || \ (__cplusplus > 199711L) /* <- C++11 is sane */ const #endif VALUE shared_root; } aux; const VALUE *ptr; } heap; const VALUE ary[RARRAY_EMBED_LEN_MAX]; } as; };

10. Arrayͷߏ଄ମʹ͍ͭͯௐ΂Δ struct RArray { struct RBasic basic; union { struct

    { long len; union { long capa; #if defined(__clang__) /* <- clang++ is sane */ || \ !defined(__cplusplus) /* <- C99 is sane */ || \ (__cplusplus > 199711L) /* <- C++11 is sane */ const #endif VALUE shared_root; } aux; const VALUE *ptr; } heap; const VALUE ary[RARRAY_EMBED_LEN_MAX]; } as; }; ϫʔΫΞϥ΢ϯυͷΑ͏ͳͷͰ
    ಡΈਐΊ͍ͯ͘ʹ͋ͨͬͯ
    Ұ୴ແࢹͯ͠ΈΔ

11. Arrayͷߏ଄ମʹ͍ͭͯௐ΂Δ struct RArray { struct RBasic basic; union { struct

    { long len; union { long capa; const VALUE shared_root; } aux; const VALUE *ptr; } heap; const VALUE ary[RARRAY_EMBED_LEN_MAX]; } as; };

12. Arrayͷߏ଄ମʹ͍ͭͯௐ΂Δ struct RArray { struct RBasic basic; union { struct

    { long len; union { long capa; const VALUE shared_root; } aux; const VALUE *ptr; } heap; const VALUE ary[RARRAY_EMBED_LEN_MAX]; } as; }; ࣗ਎ͷܕ΍ॴଐΫϥε΍ϑϥά
    શͯͷΦϒδΣΫτߏ଄ମ͕࣋ͭ ࣗ਎ͷ഑ྻͷ਺ ഑ྻͷશମαΠζ ڞ༗ϑϥάͬΆ͍

13. Arrayͷߏ଄ମʹ͍ͭͯௐ΂Δ struct RArray { struct RBasic basic; union { struct

    { long len; union { long capa; const VALUE shared_root; } aux; const VALUE *ptr; } heap; const VALUE ary[RARRAY_EMBED_LEN_MAX]; } as; }; ࣮ମϝϞϦ΁ͷϙΠϯλ ཁૉ਺͕
    3"33":@&.#&%@-&.@."9ҎԼͩͱ
    3"SSBZߏ଄ମͷதʹ഑ྻΛ࣋ͭΒ͍͠

14. VALUEͱ͸ • ߏ଄ମ΁ͷϙΠϯλΛද͢ • ͭ·ΓRubyͷArrayͷ࣮ମϝϞϦ͸ unsigned longͷ഑ྻ ruby.h :102 typedef

    unsigned long VALUE;

15. Array#+ͷ࣮૷ VALUE rb_ary_plus(VALUE x, VALUE y) { VALUE z; long

    len, xlen, ylen; y = to_ary(y); xlen = RARRAY_LEN(x); ylen = RARRAY_LEN(y); len = xlen + ylen; z = rb_ary_new2(len); ary_memcpy(z, 0, xlen, RARRAY_CONST_PTR_TRANSIENT(x)); ary_memcpy(z, xlen, ylen, RARRAY_CONST_PTR_TRANSIENT(y)); ARY_SET_LEN(z, len); return z; }

16. Array#+ͷ࣮૷ VALUE rb_ary_plus(VALUE x, VALUE y) { VALUE z; long

    len, xlen, ylen; y = to_ary(y); xlen = RARRAY_LEN(x); ylen = RARRAY_LEN(y); len = xlen + ylen; z = rb_ary_new2(len); ary_memcpy(z, 0, xlen, RARRAY_CONST_PTR_TRANSIENT(x)); ary_memcpy(z, xlen, ylen, RARRAY_CONST_PTR_TRANSIENT(y)); ARY_SET_LEN(z, len); return z; } ৽͍͠3"SSBZߏ଄ମΛ࡞Δ 7"-6&ΛNFNDQZ͢Δ
    ֤ΦϒδΣΫτߏ଄ମΛίϐʔ͢ΔΘ͚Ͱ͸ͳ͍
    

17. Array#concatͷ࣮૷ • RArrayߏ଄ମͷheap.aux.capaΛ֬ೝ • concatޙͷαΠζΑΓখ͔ͬͨ͞Βmalloc͠ ͨΓreallocͨ͠Γͯ͠ϝϞϦΛ֬อ͢Δ໛༷ • Ξϩέʔτ͞ΕͨϝϞϦʹVALUEΛmemcpy

18. ·ͱΊ • ArrayͷඇഁյతϝιουͰੜ੒͞ΕΔͷ͸ unsigned intͷ഑ྻͳͷͰΊͬͪΌ௕͍Array ͱ͔Ͱͳ͚Ε͹ϝϞϦޮ཰͸ؾʹ͠ͳͯ͘Α ͦ͞͏ • Rubyͷ࣮૷ΛͪΐͬͱཧղͰ͖ͯΑ͔ͬͨ