Ruby ソースコードの歩き方

3VCZιʔείʔυͷา͖ํ /BP.JOBNJ !TPVUI

ࣗݾ঺հ

/BP.JOBNJ!TPVUI !NJOBNJP 4PGUXBSFFOHJOFFS !8BOUFEMZ *OD

3VCZΛιʔείʔυ͔Βཧղ͍ͨ͠ʂ

τοϓϨϕϧͰϑΝΠϧɺσΟϨΫτϦ

ʜͲ͔͜ΒಡΜͩΒྑ͍͔͕෼͔Βͳ͍

Ͱ΋ɺߏ੒΍֓ཁΛ஌͍ͬͯΕ͹ ͣͬͱಡΈ΍͘͢ͳΔ͸ͣ

3VCZιʔείʔυͷ֓ཁΛ஌Δ Ͱ΋ɺߏ੒΍֓ཁΛ஌͍ͬͯΕ͹ ͣͬͱಡΈ΍͘͢ͳΔ͸ͣ

w 3VCZιʔείʔυͷ֓ཁΛ஌Δ w 3VCZ࣮ߦ࣌ͷڍಈ w ·ͱΊ ࠓ೔࿩͢಺༰

3VCZιʔείʔυͷ֓ཁΛ஌Δ w 3VCZϨϙδτϦ w τοϓϨϕϧͰϑΝΠϧɺσΟϨΫτϦ w NBLFͰϏϧυɺNBLFJOTUBMMͰΠϯετʔϧ w ओཁͳϑΝΠϧ͸࣮͸ଟ͘ͳ͍ w
ಛʹɺQBSTFZ DPNQJMFD JOTOTEFG͕ॏཁ

3VCZॲཧܥͷ֓ཁ w QBSTFʜSVCZίʔυ͔Β"45Λੜ੒ w DPNQJMFʜ"45͔Β:"37໋ྩྻΛੜ੒ w SVOUJNFʜ:"37໋ྩΛ࣮ߦ 3VCZ΋ଟ͘ͷݴޠॲཧܥͱಉ༷ɺεςοϓ͕ଘࡏ ͦΕͧΕͷεςοϓ͸Ͳ͜ͰͲ͏࣮૷͞Ε͍ͯΔͷ͔ʁ

QBSTF w QBSTFʜSVCZίʔυ͔Β"45Λੜ੒ w DPNQJMFʜ"45͔Β:"37໋ྩྻΛੜ੒ w SVOUJNFʜ:"37໋ྩΛ࣮ߦ

QBSTF puts 2 + 2 3VCZίʔυ UPLFOྻ NODE_CALL + NODE_LIT
2 identiﬁer puts integer 2 integer 2 op + NODE_LIT 2 NODE_FCALL puts "45 ந৅ߏจ໦

QBSTF w QBSTFZͰఆٛ w ߦ͋Δ௒ڊେϑΝΠϧ w CJTPOͷ༷ͳQBSTFSHFOFSBUPSʹ৯Θ͢QBSTFD w #/'Ͱهड़ɺBDUJPO΍ͦͷଞͷ෦෼͸$Ͱهड़
w UPLFO͸EFGTLFZXPSETͰఆٛ 3VCZͷจ๏Λ࿔Γ͔ͨͬͨΒQBSTFZΛݟΕ͹ྑ͍

DPNQJMF w QBSTFʜSVCZίʔυ͔Β"45Λੜ੒ w DPNQJMFʜ"45͔Β:"37໋ྩྻΛੜ੒ w SVOUJNFʜ:"37໋ྩΛ࣮ߦ

DPNQJMF "45͔ΒDPNQJMFͯ͠:"37໋ྩྻੜ੒ NODE_CALL + NODE_LIT 2 NODE_LIT 2 NODE_FCALL puts
"45 putself putobject 2 putobject 2 opt_plus opt_send_simple <callinfo!mid:puts, argc:2…> :"37໋ྩྻ

DPNQJMF w DPNQJMFDͰఆٛ w ߦ͋Δ௒ڊେϑΝΠϧ w "45Λ૸ࠪͯ͠:"37໋ྩ JTFR Λੜ੒
w ASC@JTFR@DPNQJMF@OPEF SC@JTFR@U JTFR /0%& OPEF A͕ݺ͹ΕΔ "45͕มΘͬͨΒɺDPNQJMFD΋मਖ਼

SVOUJNF w QBSTFʜSVCZίʔυ͔Β"45Λੜ੒ w DPNQJMFʜ"45͔Β:"37໋ྩྻΛੜ੒ w SVOUJNFʜ:"37໋ྩΛ࣮ߦ

putself putobject 2 putobject 2 opt_plus opt_send_simple <callinfo!mid:puts, argc:2…> :"37໋ྩྻΛॱ൪ʹ࣮ߦ
SVOUJNF 4UBDL1PJOUFS 41 :"37ͷ಺෦ελοΫ 1SPHSBN$PVOUFS 1$

SVOUJNF:"37໋ྩͷఆٛ :"37໋ྩͷఆٛ͸Ͳ͜ʁ

SVOUJNF:"37໋ྩͷఆٛ w JOTOTEFGͰ:"37໋ྩΛఆٛ w QVUTFMG QVUPCKFDU TFOE FUDͷఆٛΛهࡌ w !@LPʹΑΔ%4-
w ΄΅$͕ͩɺڞ௨෦෼͸ল͍ͯΔ w UPPMJOTOTWNSCͱ͍͏SVCZεΫϦϓτͰ JOTOTEFG͔Βίʔυੜ੒Λߦ͏WNJOD :"37໋ྩΛग़ൃ఺ʹಡΉ৔߹͸JOTOTEFGΛݟΔͱྑ͍

ͦͷଞͷϑΝΠϧ QBSTFZ DPNQJMFD JOTOTEFGҎ֎ͷ ϑΝΠϧ͸Կʹ࢖ΘΕΔʁ

ͦͷଞͷϑΝΠϧ w QBSTFZ DPNQJMFD JOTOTEFG͔Βݺͼग़͞ΕΔॲཧ w QBSTF DPNQJMFͷݺͼग़͠ɺWNͷॲཧ w ϏϧτΠϯͷΫϥε
0CKFDU "SSBZ 4USJOH FUDʜ w υΩϡϝϯτ େମҎԼͷͭͷͲΕ͔

ಡΈํ͕෼͔Ε͹ ɹ3VCZͷιʔείʔυ͸ා͘ͳ͍ʂ

w 3VCZιʔείʔυͷߏ੒Λ஌Δ w 3VCZ࣮ߦ࣌ͷڍಈ w ·ͱΊ ࠓ೔࿩͢಺༰

$ ruby -e ‘print “Hello World!”’ Hellow World! 3VCZΛUFSNJOBM͔Β࣮ߦ 3VCZΛUFSNJOBM͔Β࣮ߦ

int main(int argc, char **argv) { . . . {
. . . return ruby_run_node(ruby_options(argc, argv)); } } w 3VCZ࣮ߦ࣌͸ANBJOAؔ਺͕ΤϯτϦʔϙΠϯτ w ASVCZ@PQUJPOTAͰQBSTF DPNQJMF w ASVCZ@SVO@OPEFA͕:"37໋ྩྻΛ࣮ߦ 3VCZͷNBJOؔ਺

SVCZ@PQUJPOT void * ruby_options(int argc, char **argv) { . .
. if ((state = EXEC_TAG()) == 0) { SAVE_ROOT_JMPBUF(GET_THREAD(), iseq = ruby_process_options(argc, argv)); } else { . . iseq = (void *)INT2FIX(state); } . . . return iseq; } w JTFR :"37໋ྩྻ Λฦ͢ w ॲཧΛ௥͏ͱɺQBSTFZͰఆٛ͞ΕͨAZZQBSTFA΍ DPNQJMFDͰఆٛ͞ΕͨASC@JTFR@DPNQJMF@OPEFAΛར༻

SVCZ@PQUJPOT void * ruby_options(int argc, char **argv) { . .
. if ((state = EXEC_TAG()) == 0) { SAVE_ROOT_JMPBUF(GET_THREAD(), iseq = ruby_process_options(argc, argv)); } else { . . iseq = (void *)INT2FIX(state); } . . . return iseq; } w JTFR :"37໋ྩྻ Λฦ͢ w ॲཧΛ௥͏ͱɺQBSTFZͰఆٛ͞ΕͨAZZQBSTFA΍ DPNQJMFDͰఆٛ͞ΕͨASC@JTFR@OFX@NBJOAΛར༻ QBSTFZ DPNQJMFD ʹḷΓண͍ͨʂ

SVCZ@SVO@OPEF w JTFR :"37໋ྩྻ Λ࣮ߦ͢Δ w ॲཧΛ௥͏ͱɺAWN@FYFD@DPSFA͕࣮ߦ͞ΕΔ w JOTOTEFG͔Βੜ੒ͨ͠Dίʔυ͕ຒΊࠐ·ΕͯΔ static
VALUE vm_exec_core(rb_thread_t *th, VALUE initial) { . . . first: INSN_DISPATCH(); /*****************/ #include "vm.inc" /*****************/ END_INSNS_DISPATCH(); . . . }

SVCZ@SVO@OPEF w JTFR :"37໋ྩྻ Λ࣮ߦ͢Δ w ॲཧΛ௥͏ͱɺJOTOTEFG͔Βੜ੒ͨ͠Dίʔυ͕ ຒΊࠐ·ΕͨAWN@FYFD@DPSFA͕࣮ߦ͞ΕΔ static VALUE
vm_exec_core(rb_thread_t *th, VALUE initial) { . . . first: INSN_DISPATCH(); /*****************/ #include "vm.inc" /*****************/ END_INSNS_DISPATCH(); . . . } JOTOTEFGʹḷΓண͍ͨʂ

͔֬ʹɺQBSTFZ DPNQJMFD JOTOTEFG Λԡ͑͞Ε͹3VCZΛཧղͰ͖ͦ͏

w 3VCZιʔείʔυͷߏ੒Λ஌Δ w 3VCZ࣮ߦ࣌ͷڍಈ w ·ͱΊ ࠓ೔࿩͢಺༰

·ͱΊ w 3VCZͷιʔείʔυ͸ා͘ͳ͍ w QBSTF DPNQJMF SVOUJNFͷͦΕͧΕͷεςοϓͷ ओཁͳϑΝΠϧΛೖΓޱʹ͢ΔͱಡΈ΍͍͢ w NBJOؔ਺͔ΒಡΈ࢝ΊΔͷ΋ָ͍͠
3VCZΛιʔείʔυ͔Βཧղͯ͠ɺ ָ͍͠3VCZϥΠϑΛૹΖ͏ʂ

Ruby ソースコードの歩き方

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