php-srcを読んでみよう / php-src codereading

PHP Conference Japan 2022の発表資料です。
https://fortee.jp/phpcon-2022/proposal/1addf51d-6f72-4c96-9337-034ec6cc0643

Transcript

1. גࣜձࣾϠϓϦ
   ా࣮੣ QIQTSDΛಡΜͰΈΑ͏
2. ࣗݾ঺հ w ా࣮੣
   
   !U[N@GSFFEPN
   w גࣜձࣾϠϓϦͷαʔόʔαΠυΤϯδχΞ
   w 1)1ྺ͸ʙ೥͘Β͍
   w $ݴޠྺ͸̍೥͘Β͍ʹॳ৺ऀ
   w 1)1FS,BJHJ
   Ͱ͸1)1Ͱ1)1Λ࣮૷ 
 1)1
   $POGFSFODF
   Ͱ͸ಠࣗϑϨʔϜϫʔΫΛվળ 
 1)1FS,BJHJ
   Ͱ͸1)1Ͱ1)1ͷσόοΨʔΛ࣮૷
4. ͜ͷηογϣϯͰ͸
   ϓϩάϥϛϯάݴޠͷιʔείʔυΛ
   ಡΈ͍ͨͱ͍͏ਓͷເΛ׎͑·͢
5. ͜ͷηογϣϯͷ໨త w1)1ຊମͷιʔείʔυ
   QIQTSD
   ΛಡΉ্Ͱඞཁͳ஌ ࣝ΍ಡΈํΛͬ͟ͱ঺հ
   wQIQTSDΛશ͘ಡΜͩ͜ͱ͕ͳ͘ɺ$ݴޠ΋ͦΜͳʹ஌ Βͳ͍ਓ͕ಡΊͦ͏ͳؾ࣋ͪʹͳΔ͜ͱ͕໨ඪ
   w͜ΕΛ͖͔͚ͬʹQIQTSDΛಡΉحಛͳਓΛ૿΍͢ 
 ϓϩάϥϛϯάݴޠͷιʔείʔυΛ͍͔ͭಡΜͰΈͨ ͍ɺͱࢥ͍ͬͯΔਓͷಡΉ͖͔͚ͬʹͳͬͯ͘ΕΔͱخ ͍͠Ͱ͢
6. ͜ͷηογϣϯͰ࿩͢͜ͱ w QIQTSDͷσόοάͷํ๏
   w σόοάϏϧυͷํ๏
   w (%#ͷΠϯετʔϧ
   w QIQTSDΛಡΉ্Ͱඞཁͳ1)1ͱ$ݴޠͷ஌ࣝ
   w FDIPͷίʔυΛಡΜͰΈΑ͏
   w 1)1Λվ଄ͯ͠ΈΑ͏
   w ˞ಡΉ͜ͱʹϑΥʔΧε͍ͯ͠·͢
7. QIQTSDͷσόοάͷํ๏
8. QIQTSDͷσόοά͕Ͱ͖ΔΑ͏ʹ͢Δ w ίʔυΛಡΉ͚ͩͰ׬શʹཧղ͢Δ͜ͱ͸೉͍͠
   w σόοά͢Δ͜ͱͰɺͦͷͱ͖ͷม਺ͷ஋΍ݺͼग़͠ݩʢελ οΫτϨʔεʣ͕֬ೝͰ͖ͯਖ਼͍͠ཧղ͕Ͱ͖Δ
   w σόοά͢Δʹ͸1)1ͷσόοάϏϧυ͕ඞཁ
   w 1)1͸$ݴޠͰ࣮૷͞Ε͍ͯΔͷͰ(%#ͰσόοάͰ͖Δ
   w (%#
   
   (/6
   %FCVHHFS
   
   $6*56*ͳσόοΨʔ
9. 1)1ͷσόοάϏϧυͷํ๏ Ϗϧυ͢ΔͱTBQJDMJQIQʹ1)1ͷ$-*͕࡞੒͞ΕΔ $ git clone git@github.com:php/php-src.git $ cd php-src $ ./buildconf $ ./configure --enable-opcache --enable-debug $ make -j4 $ sapi/cli/php test.php
10. (%#ΛΠϯετʔϧ
    NBD04ͷ৔߹ w ίʔυॺ໊Λ͠ͳ͍ͱ࢖͑ͳ͍ͷͰΩʔνΣʔϯΞΫηεͰূ ໌ॻΛ࡞੒ͯ͠YNMϑΝΠϧ࡞੒ͯ͠ίʔυॺ໊͢Δ
    w ৄࡉ͸ൃදࢿྉͷ"QQFOEJYʹهࡌ $ brew install gdb $ codesign --entitlements gdb.xml -fs gdb $(which gdb)
11. (6*ͳσόοάͷઃఆ w ׽͸໧ͬͯ(%#Λ௚઀࢖ͬͨ56*σόοάͰ΋ྑ͍͕
    w (6*ϕʔεͷσόοά͕Ͱ͖Δͱίʔυͷཧղ͕ḿΔ
    w 74
    $PEFͰͷ(6*σόοάͷઃఆ͸͜Ε͚ͩˣ
    w $$ ͷϓϥάΠϯΛΠϯετʔϧ
    w MBVODIKTPOΛઃఆ
    w ৄࡉ͸ൃදࢿྉͷ"QQFOEJYʹهࡌ
12. (6*ͷσόοάྫ ม਺Λ֬ೝ͢Δͱ͜Ζ ίʔϧελοΫ εςοϓ࣮ߦͷૢ࡞
13. σόοάίϯιʔϧͰ56*σόοά͢Δ͜ͱ΋Մೳ ͜͜ͰίϚϯυΛ࣮ߦ
14. HECJOJUͰ͞Βʹศརʹσόοά͢Δ w (%#ʹ͸HECJOJUͱ͍͏(%#࣮ߦ࣌ʹಡ·ΕΔϑΝΠϧ͕͋Δ
    w QIQTSD௚Լʹ΋HECJOJU͕͋ΓɺQIQTSDΛσόοά͢Δͨ Ίͷศརؔ਺͕༻ҙ͞Ε͍ͯΔ QSJOU@DWT $7ʢม਺ʣͷҰཡΛऔಘ QSJOU[W [WBMΛಡΈ΍͘͢දࣔ QSJOU@[TUS [TUSJOHΛಡΈ΍͘͢දࣔ HECJOJUʹఆٛ͞Ε͍ͯΔؔ਺ͷྫ
15. Α͠ɺ1)1ͷίʔυΛಡΉͧʂ
16. ͦͷલʹ$ݴޠͷجૅ஌ࣝ
17. QIQTSDΛಡΉલͷ$ݴޠͷجૅ஌ࣝ w جຊతʹ͸งғؾͰಡΜͰ͍͚͹0,
    w ϚΫϩͱϝϞϦ͚ͩ஫ҙ͕ඞཁ
18. ϚΫϩ w ϏϧυલʹߦΘΕΔจࣈྻஔ׵
    w จࣈྻஔ׵͕Ώ͑ԿͰ΋Ͱ͖Δɻ$ݴޠͷߏจແࢹͯ͘͠Δɻ
    w QIQTSD
    ΛಡΉͱ͖͸େྔͷϚΫϩͱ޲͖߹͏ඞཁ͕͋Δ #define PHP_VERSION "8.2.0-dev" #define PHP_VERSION_ID 80200
19. ࣮ࡍͷίʔυྫ static ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_ECHO_SPEC_CONST_HANDLER(ZEND_OPCODE_HANDLER_ARGS) { USE_OPLINE zval *z; SAVE_OPLINE(); z = RT_CONSTANT(opline, opline->op1);
20. ࣮ࡍͷίʔυྫ static ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_ECHO_SPEC_CONST_HANDLER(ZEND_OPCODE_HANDLER_ARGS) { USE_OPLINE zval *z; SAVE_OPLINE(); z = RT_CONSTANT(opline, opline->op1); ͑ɺͳΜ͔ηϛίϩϯແ͍Μ͚ͩͲʜʂ ͑ɺܕ͕ϚΫϩʹͳ͍ͬͯΔʜʁ ͑ɺҾ਺Ͳ͏ͳͬͯΜͷʜʂʁ PQMJOF͍ͬͯ͏ม਺ɺͲ͜ʹ΋ఆٛ͞Ε͍ͯͳ͍ͷ͕ͩʜʁʁ
21. ϚΫϩ͸͜Μͳײ͡Ͱఆٛ͞Ε͍ͯΔ # define ZEND_OPCODE_HANDLER_RET int # define ZEND_FASTCALL # define ZEND_OPCODE_HANDLER_ARGS zend_execute_data *execute_data # define USE_OPLINE const zend_op *opline = EX(opline); #define EX(element) ((execute_data)->element)
22. ల։͢Δͱ͜Μͳײ͡ static int ZEND_ECHO_SPEC_CONST_HANDLER(zend_execute_data *execute_data) { const zend_op *opline = ((execute_data)->opline); zval *z; static ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_ECHO_SPEC_CONST_HANDLER(ZEND_OPCODE_HANDLER_ARGS) { USE_OPLINE zval *z;
23. ͜ΜͳϚΫϩ΋͋Δ ZEND_HASH_MAP_FOREACH_STR_KEY(ht, key) { //… } ZEND_HASH_FOREACH_END(); do { for(...) { { //... } } } while(0) w ։࢝ͷϚΫϩͱऴྃͷϚΫϩͰରʹͳ Δɻ
    w ͪͳΈʹ
    EP
    ʙ
    XIJMF 
    ΛೖΕ͍ͯΔͷ ͸JGจͳͲͰෳ਺จͷల։Λͨ͠ͱ͖ʹ ҙਤͨ͠ڍಈʹ͢ΔͨΊ
24. ϝϞϦ഑ஔ w ܕఆٛΛݟΔ͚ͩͰ͸ίʔυ͕ಡΊͳ͍ʢʂʁʣ
    w $ݴޠ͸ϝϞϦ؅ཧΛॊೈʹߦ͑Δ
    w ܕఆ͚ٛͩͰ͸ͳ͘ɺϝϞϦׂΓ౰ͯɾ഑ஔΛཧղ͢Δඞཁ ͕͋Δ
25. ίʔϧϑϨʔϜͷϝϞϦ഑ஔྫ w [FOE@FYFDVUF@EBUB
    
    ม਺ [WBM
    
    ʜ
    ͱ͍͏ײ͡Ͱ഑ஔ͞Εͯ ͍Δ
    w ϝϞϦΛಈతʹ֬อͯ͠[FOE@FYFDVUF@EBUBͱ[WBMͷྖҬΛܾΊͯ ഑ஔ 
 
    [FOE@FYFDVUF@EBUBͷఆ͚ٛͩͰ͸ϝϞϦ഑ஔ͸Θ͔Βͳ͍ [WBM FYFDVUF@EBUB ࣮ߦதͷؔ਺΍0QDPEF౳ΛؚΉߏ଄ମ [WBM ൪໨ͷม਺ ൪໨ͷม਺
26. ม਺ͷߏ଄ମΛऔಘ͢Δྫ ((zval*)(((char*)(execute_data)) + ((int)(n)))) w FYFDVUF@EBUBͷϙΠϯλʢઌ಄ͷΞυϨεʣ͔ΒOόΠτઌ ʹ͋ΔΞυϨε͔Β[WBMߏ଄ମΛऔಘ͍ͯ͠Δɻ
27. Α͠ɺ1)1ͷίʔυΛಡΉͧʂ
28. ͦͷલʹ1)1ͷجૅ஌ࣝ
29. 4"1* w 4FSWFS
    "1*
    w ༷ʑͳ8FCαʔόʔͰ1)1Λಈ͔ͨ͢Ίͷ"1*
    w 1)1ͷίΞʹ;FOE
    &OHJOFΛ࢖͏ͨΊͷΠϯλʔϑΣʔε
    w $-*
    1)1%#(
    NPE@QIQ
    QIQGQN
    'BTU$(*
    ʜ
30. ;FOE
    &OHJOF w 1)1ͷεΫϦϓτΛ࣮ߦ͢ΔΤϯδϯ
    w $-*΋NPE@QIQ΋QIQGQN΋࠷ऴతʹ;FOE
    &OHJOFΛݺΜͰ ͍Δ
31. 4"1*;FOE
    &OHJOFͷ֓ཁਤ BQBDIF NPE@QIQ
    4"1* ;FOE
    &OHJOF )551
    ϦΫΤετ $-*
    4"1* ;FOE
    &OHJOF ίϚϯυ
    ࣮ߦ OHJOY QIQGQN
    4"1* ;FOE
    &OHJOF )551
    ϦΫΤετ
32. $-*ͷFDIPͷελοΫτϨʔε NBJO TBQJDMJQIQ@DMJD EP@DMJ TBQJDMJQIQ@DMJD QIQ@FYFDVUF@TDSJQU NBJONBJOD [FOE@FYFDVUF@TDSJQUT ;FOE[FOED [FOE@FYFDVUF ;FOE[FOE@WN@FYFDVUFI FYFDVUF@FY ;FOE[FOE@WN@FYFDVUFI ;&/%@&$)0@41&$@$0/45@)"/%-&3 ;FOE[FOE@WN@FYFDVUFI 4"1* ;FOE
    &OHJOF
33. QIQGQNͷFDIPͷελοΫτϨʔε NBJO TBQJGQNGQNGQN@NBJOD QIQ@FYFDVUF@TDSJQU NBJONBJOD [FOE@FYFDVUF@TDSJQUT ;FOE[FOED [FOE@FYFDVUF ;FOE[FOE@WN@FYFDVUFI FYFDVUF@FY ;FOE[FOE@WN@FYFDVUFI ;&/%@&$)0@41&$@$0/45@)"/%-&3 ;FOE[FOE@WN@FYFDVUFI 4"1* ;FOE
    &OHJOF
34. 1)1ͷॲཧͷྲྀΕ
35. 1)1ͷॲཧͷྲྀΕ  4"1*͔Βىಈ
     εΫϦϓτΛղੳͯ͠"45Խ
     "45
    ͔Β
    0QDPEFʢόΠτίʔυʣΛੜ੒
     0QDPEFΛ࣮ߦ
36. 
    1)1εΫϦϓτΛղੳͯ͠"45Խ w "45
    
    "CTUSBDU
    4ZOUBY
    5SFF
    w ͍ΘΏΔࣈ۟ղੳɺߏจղੳ
    w ࡶʹݴ͏ͱεΫϦϓτΛߏ଄ମʹ͢Δॲཧ [FOE@BTU
    "45@45.5@-*45 [FOE@BTU
    "45@"44*(/ [FOE@BTU
    "45@&$)0  QIQ
    J
    
    
    FDIP
    J
37. ࣈ۟ղੳɾߏจղੳͷίʔυ͸ࣗಈੜ੒͞ΕΔ start: top_statement_list { CG(ast) = $1; (void) zendnerrs; } ; echo_expr_list: echo_expr_list ',' echo_expr { $$ = zend_ast_list_add($1, $3); } | echo_expr { $$ = zend_ast_create_list(1, ZEND_AST_STMT_LIST, $1); } ; echo_expr: expr { $$ = zend_ast_create(ZEND_AST_ECHO, $1); } ; w ;FOE[FOE@MBOHVBHFZ
    ΍
    ;FOE[FOE@MBOHVBHF@TDBOOFSM
    ͔Β 
 ύʔαʔͷίʔυ͕ࣗಈੜ੒͞ΕΔ
38. 
    "45͔Β0QDPEFΛੜ੒ [FOE@BTU
    "45@45.5@-*45 [FOE@BTU
    "45@"44*(/ [FOE@BTU
    "45@&$)0 "44*(/ &$)0 $7 JOU  TUSJOH
    lIPHFz  PQDPEF PQ PQ   SFTVMU w ωετͨ͠ଟ֊૚ͷߏ଄ମ͔Β̍֊૚ͷߏ଄ମͷ഑ྻʹม׵
39. ม׵͍ͯ͠Δॲཧͷྫ static void zend_compile_echo(zend_ast *ast) /* {{{ */ { zend_op *opline; zend_ast *expr_ast = ast->child[0]; znode expr_node; zend_compile_expr(&expr_node, expr_ast); opline = zend_emit_op(NULL, ZEND_ECHO, &expr_node, NULL); opline->extended_value = 0; } &$)0ͷ0QDPEFΛ࡞੒ w ;FOE[FOE@DPNQJMFD
    ʹ"45͔Β0QDPEFΛੜ੒͢Δؔ਺͕͋Δ
40. 0QDPEFͷ֬ೝํ๏ w 0QDBDIFͷΦϓγϣϯΛࢦఆ͢Δͱ0QDPEFΛμϯϓͰ͖Δ $ sapi/cli/php -dopcache.opt_debug_level=0x10000 test.php $_main: ; (lines=3, args=0, vars=1, tmps=1) ; (before optimizer) ; /Users/nuser/phpconf2022/php-src/test.php:1-5 ; return [] RANGE[0..0] 0000 ASSIGN CV0($i) int(1) 0001 ECHO CV0($i) 0002 RETURN int(1)
41. 
    0QDPEFͷ࣮ߦ w 0QDPEFͱΦϖϨʔλͭɺ ݁Ռͷ֨ೲઌ͕ೖ͍ͬͯΔ
    w 0QDPEFΛ࣮ߦ͢Δϋϯυϥ ʔʢؔ਺ϙΠϯλʣ΋ඥ෇͍ ͍ͯΔ struct _zend_op { const void *handler; znode_op op1; znode_op op2; znode_op result; uint32_t extended_value; uint32_t lineno; zend_uchar opcode; zend_uchar op1_type; zend_uchar op2_type; zend_uchar result_type; };
42. 0QDPEFΛ࣮ߦ͍ͯ͠Δίʔυ while (1) { int ret; if (UNEXPECTED((ret = ((opcode_handler_t)OPLINE- >handler)(ZEND_OPCODE_HANDLER_ARGS_PASSTHRU)) != 0)) { if (EXPECTED(ret > 0)) { execute_data = EG(current_execute_data); ZEND_VM_LOOP_INTERRUPT_CHECK(); } else { return; } } }
43. Α͠ɺ1)1ͷίʔυΛಡΉͧʂʢ̏ճ໨
44. FDIPΛಡΜͰΈΑ͏
45. FDIP͕Ͳ͏ಈ͍͍ͯΔͷ͔ΛݟͯΈΑ͏ w "45Λ֬ೝ͢Δ
    w 0QDPEFΛ֬ೝ͢Δ
    w ϋϯυϥʔͷॲཧΛ֬ೝ͢Δ
46. "45Λ֬ೝ͢Δ w ద౰ͳͱ͜ΖʹϒϨʔΫϙΠϯτΛషͬͯ
    $( BTU
    Λσόο ά͢Δ
    w ͷ͸େมͳͷͰ
    OJLJDQIQBTUΛ࢖ͬͯશମͷߏ଄Λ೺Ѳ͢Δ $ pecl install ast var_dump(ast\parse_code(‘<?php echo "hoge";', $version=90));
47. class ast\Node#1 (4) { public $kind => int(132) public $flags => int(0) public $lineno => int(1) public $children => array(1) { [0] => class ast\Node#2 (4) { public $kind => int(283) public $flags => int(0) public $lineno => int(1) public $children => array(1) { 'expr' => string(4) "hoge" } } } } w 
    
    ;&/%@"45@45.5@-*45
    w 
    
    ;&/%@"45@&$)0 [FOE@BTU
    "45@45.5@-*45 [FOE@BTU
    "45@&$)0 [FOE@BTU@[WBM 
 TUSJOH
48. 0QDPEFΛ֬ೝ͢Δ w &$)0ͱ͍͏0QDPEFΛ֬ೝͰ͖Δ 
 
    &$)0ΛϋϯυϦϯά͢Δؔ਺͕͋Δ͸ͣ
    w ˞3&563/
    JOU 
    ͸Ұ୴εϧʔͰ0, 0000 ECHO string(“hoge”) 0001 RETURN int(1)
49. ϋϯυϥʔΛ֬ೝ͢Δ w ;FOE[FOE@WN@FYFDVUFIʹఆٛ͞Ε͍ͯΔ
    w ;&/%@\0QDPEF^@41&$@\Ҿ਺ͷछผ^@)"/%-&3
    ͱ͍͏໊લʹͳ͍ͬͯΔ
    w &$)0ͷϋϯυϥʔͰ͸
    [FOE@XSJUF
    ؔ਺͕ݺ͹Ε͍ͯΔ static ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_ECHO_SPEC_CONST_HANDLER(ZEND_OPCODE_HANDLER_ARGS) { // …লུ… if (ZSTR_LEN(str) != 0) { zend_write(ZSTR_VAL(str), ZSTR_LEN(str));
50. [FOE@XSJUF w ؔ਺ϙΠϯλ
    w 4"1*ʹΑͬͯηοτ͞ΕΔؔ਺͕มΘΔ
    w $-*͸ඪ४ग़ྗʹॻ͖ࠐΉ
    w NPE@QIQ͸BQBDIFͷؔ਺ܦ༝Ͱ)551ϨεϙϯεΛฦ͢ extern ZEND_API zend_write_func_t zend_write; typedef size_t (*zend_write_func_t)(const char *str, size_t str_length);
51. 1)1Λվ଄ͯ͠ΈΑ͏
52. վ଄ֶͯ͠Ϳ1)1 w ԿΛFDIPͯ͠΋ʮ1)1࠷ߴʂʂʯ͕ग़Δ1)1ʹ͢Δ $ sapi/cli/php test.php PHP࠷ߴ!!PHP࠷ߴ!!PHP࠷ߴ!!PHP࠷ߴ!! <?php echo "hoge"; echo "hoge"; echo "hoge"; echo "hoge"; $ sapi/cli/php test.php hogehogehogehoge
53. վ଄ͷ΍Γํ w 0QDPEFͷॲཧͷৼΔ෣͍Λม͑Ε͹0,
    w ;&/%@&$)0@41&$@$0/45@)"/%-&3
    ͳͲ
    w ॻ͖׵͑ͨ͋ͱ͸࠶౓
    NBLF
    ͯ͠Ϗϧυ - zend_write(ZSTR_VAL(str), ZSTR_LEN(str)); + char *str = “PHP࠷ߴ!!”; + zend_write(str, strlen(str));
55. QIQTSD
    ಡΊͦ͏ʹͳΓ·ͨ͠ΑͶʁ
56. ·ͱΊ w 1)1ͷσόοάͷํ๏͔ΒಡΉํ๏·Ͱͬ͟ͱ঺հ͠·ͨ͠
    w ϓϩάϥϛϯάݴޠͷίʔυΛಡΉͷ͸ɺ΍Γํ͑͞஌ͬͯ ͍Ε͹ͦ͏೉͗͢͠Δ΋ͷͰ΋ͳ͘୭Ͱ΋Ͱ͖·͢
    w ීஈԿؾͳ͘࢖͍ͬͯΔ1)1͕Ͳ͏΍ͬͯಈ͍͍ͯΔͷ͔͕ Θ͔Δͱ໘ന͍Ͱ͢
    w ஌Βͳ͍࢓༷΋ग़͖ͯͨΓɺݴޠ࢓༷ΛΑΓཧղͰ͖·͢
    w ΤϯδχΞͷᅂΈͱ͍͔͕ͯ͠Ͱ͠ΐ͏͔ʁ
57. &OKPZ
    $PEF3FBEJOHʂʂ
58. "QQFOEJY
59. ಡΉ্Ͱࢀߟʹͳͬͨهࣄ w ϨϯδΦϖϨʔλͷ࣮૷
    w IUUQTQIQJOUFSOBMTOFUBSUJDMFT JNQMFNFOUJOH@B@SBOHF@PQFSBUPS@JOUP@QIQ
    
    w ৽͍͠ԋࢉࢠΛ࣮૷͍ͯ͘͠QIQTSDνϡʔτϦΞϧ
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