DBGpを使って PHPのデバッガーをつくろう / DGBp PHP Debugger

by tzmfreedom

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גࣜձࣾϠϓϦా࣮੣ %#(QΛ࢖ͬͯ   1)1ͷσόοΨʔΛͭ͘Ζ͏

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ࣗݾ঺հ w ా࣮੣!U[N@GSFFEPN w גࣜձࣾϠϓϦͷαʔόʔαΠυΤϯδχΞ w 1)1ྺ͸ʙ೥͘Β͍ w 1)1FS,BJHJͰ͸1)1Ͱ1)1Λ࣮૷   1)1$POGFSFODFͰ͸ಠࣗϑϨʔϜϫʔΫΛվળ

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1)1FS,BJHJͰ͸ެࣜαΠτͷϝΠϯϏδϡΞϧΛ୲౰

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μΠΞϞϯυͳεϙϯαʔ΍ͬͯ·͢ʂʂʂ

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Έͳ͞Μσόοάͯ͠·͔͢ʂʁ

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͜ͷηογϣϯͰ࿩͢͜ͱ w9EFCVHͱ͸Կ͔ʁ w9EFCVHͷσόοΨͷ࢖͍ํ w9EFCVHͷσόοΨ͸ͲͷΑ͏ʹͯ͠ಈ͍͍ͯΔͷ͔ w9EFCVHͷσόοΨͷ࡞Γํ

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9EFCVHͱσόοΨʹ͍ͭͯ

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9EFCVHͱ͸Կ͔ʁ w 1)1ͷ֦ுϞδϡʔϧʢ;FOEFYUFOTJPOʣ w εςοϓσόοάɾΧόϨοδऔಘɾؔ਺ͷτϨʔεɾϓϩϑ ΝΠϦϯά͕Ͱ͖Δ։ൃ༻Ϟδϡʔϧ w $-* NPE@QIQ 'BTU$(*ͳͲͷ4"1*Ͱར༻Մೳ w ओʹεςοϓσόοάɾΧόϨοδऔಘͷจ຺Ͱ࢖ΘΕΔ͜ͱ ͕ଟ͍

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9EFCVHͷσόοΨͰͰ͖Δ͜ͱ w ΞϓϦέʔγϣϯͷεςοϓ࣮ߦ͕Ͱ͖Δ w ϒϨʔΫϙΠϯτͰ೚ҙͷ৔ॴͰϓϩάϥϜΛࢭΊΒΕΔ w ϩʔΧϧม਺ɾάϩʔόϧม਺ɾఆ਺ͷ஋ΛऔಘͰ͖Δ w 1IQ4UPSNͰσϑΥϧτͰ࢖͑ͨΓɺ7JN΍74$PEFͷϓϥ άΠϯ΋͋Δ

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1IQ4UPSN$-*ͷ৔߹ w ೚ҙͷεΫϦϓτΛσόοά࣮ߦ͢Δ͚ͩ w ಺෦తʹ͸ҎԼͷίϚϯυΛୟ͍ͯεΫϦϓτΛ࣮ߦ͠ɺ*%& ଆͰσόοΨΛىಈ͍ͯ͠Δ $ /usr/bin/php -dxdebug.mode=debug -dxdebug.client_port=9000 -dxdebug.client_host=127.0.0.1 /path/to/file.php

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1IQ4UPSN8FCͷ৔߹ w πʔϧόʔ͔ΒσόοΨ઀ଓͷड෇Λ։࢝͢Δ w 8FCαʔόʔଆͷYEFCVHͷઃఆΛ͢Δ w YEFCVHNPEF YEFCVHDMJFOU@QPSU YEFCVHDMJFOU@IPTU YEFCVHTUBSU@XJUI@SFRVFTU ʜ w ର৅ͷϖʔδʹΞΫηε͢Δ

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1IQ4UPSNϒϨʔΫϙΠϯτͷઃఆ ϒϨʔΫϙΠϯτ

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1IQ4UPSNσόοά΢Οϯυ΢ εςοϓ࣮ߦ ม਺ ίʔϧελοΫ

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9EFCVHʹΑΔσόοάͷ࢓૊Έ

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1)1͔ΒσόοΨʹ઀ଓ YEFCVHDMJFOU@IPTU YEFCVHDMJFOU@QPSU͸   ઀ଓઌͰ͋ΔσόοΨͷϗετɾϙʔτ

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%#(QͰ΍ΓऔΓ w εςοϓ࣮ߦ΍ϒϨʔΫϙΠϯτͷઃఆΛϦΫΤετ w ࣮ߦ݁Ռ΍ఀࢭ৔ॴͷ৘ใͳͲ͕Ϩεϙϯεͱͯ͠ฦͬͯ͘Δ

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%#(Qͱ͸ w ϥϯλΠϜඇґଘͳσόοΨ༻ϓϩτίϧ   ʢͱ͸͍͑9EFCVH͔͠࢖ͬͯͳͦ͞͏ w 5$1 w ϦΫΤετ͸ίϚϯυ w Ϩεϙϯε͸9.- w IUUQTYEFCVHPSHEPDTECHQ

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%#(Qͷϑϩʔ 1)1͔ΒσόοΨʹ5$1઀ଓ 1)1͔ΒJOJUύέοτΛૹ৴ σόοΨ͔ΒίϚϯυΛૹ৴ 1)1͕σόοΨʹϨεϙϯεΛฦ͢ σόοΨ͕ϨεϙϯεΛղऍ ʙͷ܁Γฦ͠

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1)1͔ΒJOJUύέοτΛૹ৴ …

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σόοΨ͔ΒίϚϯυΛૹ৴ breakpoint_set -i 2 -t line -f /path/to/file -n 14 w JΦϓγϣϯͰτϥϯβΫγϣϯ*%ʹҰҙͳ਺ࣈΛࢦఆ w Ұҙͳ਺ࣈΛࢦఆ͢Ε͹ྑ͍ͷͰ࿈൪Ͱ0, w Ϩεϙϯεʹ΋τϥϯβΫγϣϯ*%ؚ͕·ΕΔͷͰɺϦΫΤετͱ ඥ෇͚Δ͜ͱ͕Ͱ͖Δ

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1)1͕σόοΨʹϨεϙϯεΛฦ͢ τϥϯβΫγϣϯ*%

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1IQ4UPSNͷσόοΨͷ௨৴ ϒϨʔΫϙΠϯτͷઃఆ εΫϦϓτͷ࣮ߦ ίʔϧελοΫͷऔಘ

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1IQ4UPSNͷσόοΨͷ௨৴ w Ϩεϙϯε͸\9.-ͷαΠζ^laz\9.-^lazͷܗࣜ

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Ϩεϙϯεͷ಺༰ 9.-ͷαΠζ

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%#(QͰΑ͘࢖ΘΕΔίϚϯυ CSFBLQPJOU@TFU ϒϨΠΫϙΠϯτΛઃఆ͢Δ TUFQ@PWFS εςοϓΦʔόʔ TUBDL@HFU ݱࡏͷίʔϧελοΫΛऔಘ DPOUFYU@HFU ม਺ɾάϩʔόϧม਺ɾఆ਺Λऔಘ FWBM &YQSFTTJPOͷධՁ

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1IQ4UPSNϒϨʔΫϙΠϯτ CSFBLQPJOU@TFU

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1IQ4UPSNσόοά΢Οϯυ΢ TUBDL@HFU DPOUFYU@HFU TUFQ@JOUP TUFQ@PWFS

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σόοΨΛ࡞Εͦ͏ͳؾ࣋ͪʹͳ͖ͬͯ ·ͨ͠ΑͶʁ

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%#(QΛ࢖ͬͯ 1)1ͷσόοΨΛͭͬͯ͘Έͨ

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ࠓճ࡞ͬͨ΋ͷ w HECͷΑ͏ͳίϚϯυϕʔεͷσόοΨ w 1)1੡ w ׬੒ͨ͠΋ͷ͸ͪ͜Βʹˣ w IUUQTHJUIVCDPNU[NGSFFEPNQIEC $ composer global require tzmfreedom/phdb $ phdb

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%#(Qͷϑϩʔ 1)1͔ΒσόοΨʹ5$1઀ଓ 1)1͔ΒJOJUύέοτΛૹ৴ σόοΨ͔ΒίϚϯυΛૹ৴ 1)1͕σόοΨʹϨεϙϯεΛฦ͢ σόοΨ͕ϨεϙϯεΛղऍ ʙͷ܁Γฦ͠

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5$1αʔόʔΛ࣮૷ conn, 1024, 0); $command = 'xxx'; stream_socket_sendto($this->conn, "${command}\0"); } } fclose($socket);

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5$1αʔόʔΛ࣮૷ conn, 1024, 0); $command = 'xxx'; stream_socket_sendto($this->conn, "${command}\0"); } } fclose($socket); 5$1αʔόʔͷ্ཱͪ͛ 5$1઀ଓͷ଴ड 5$1ύέοτड৴ 5$1ύέοτૹ৴

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// initͷϋϯυϦϯά $this->handleMessages($conn); // breakpoint_setͳͲͷॳظઃఆ while(true) { // ϢʔβೖྗͷಡΈऔΓ $input = readline("=> "); // ίϚϯυͷૹ৴ͱϨεϙϯεͷϋϯυϦϯά if ($this->sendCommand($conn, $input)) { $this->handleMessages($conn); } } 5$1઀ଓޙͷϑϩʔ

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ϒϨʔΫϙΠϯτͷઃఆ breakpoint_set -i {id} -t line -f /path/to/file -n 14 ϒϨʔΫϙΠϯτ*% छผ ϑΝΠϧ໊ ߦ൪߸

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ϒϨʔΫϙΠϯτͷछผ MJOF ϑΝΠϧɾߦ൪߸ DBMM ؔ਺ݺͼग़ͨ͠͠ͱ͖ SFUVSO ؔ਺ݺͼग़͔͠Β໭ͬͨͱ͖ FYDFQUJPO &YDFQUJPO͕εϩʔ͞Εͨͱ͖ DPOEJUJPOBM ϑΝΠϧɾߦ൪߸ʴධՁ৚݅

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ϒϨʔΫϙΠϯτͰࢭΊͨ͋ͱ͸ʜ w ίʔϧελοΫΛ֬ೝ w ม਺Λ֬ೝ w εςοϓ࣮ߦ w FWBM w ͳͲͳͲ

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ίʔϧελοΫΛ֬ೝ stack_get -i {id} ϑΝΠϧ໊ ߦ൪߸ ελοΫ৘ใ

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ม਺Λ֬ೝ context_get -i {id} ஋ ม਺໊

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ม਺Λ֬ೝΦϒδΣΫτͷ৔߹ Πϯελϯεม਺ Ϋϥε໊

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εςοϓ࣮ߦ step_over -i {id} ݱࡏͷϑΝΠϧ໊ ݱࡏͷߦ൪߸

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FWBMͰ&YQSFTTJPOΛධՁ eval -i {id} -d 1 -- ZWNobyAkaTs= FYQSFTTJPOͷCBTF ධՁ஋

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͓·͚

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ʲ্ڃฤʁʳ9EFCVH͸Ͳ͏΍ͬͯಈ͍͍ͯΔʁ w 1)1͔ΒσόοΨʹ5$1઀ଓͨ͠ΓɺϒϨʔΫϙΠϯτ΍ε ςοϓ࣮ߦͰॲཧΛࢭΊͯσόοΨʹϨεϙϯεΛૹ͍ͬͯΔ w ͜ΕΛ1)1ͰͲ͏΍࣮ͬͯݱ͍ͯ͠Δͷ͔

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ʲ্ڃฤʁʳ9EFCVH͸Ͳ͏΍ͬͯಈ͍͍ͯΔʁ w 1)1͔ΒσόοΨʹ5$1઀ଓͨ͠ΓɺϒϨʔΫϙΠϯτ΍ε ςοϓ࣮ߦͰॲཧΛࢭΊͯσόοΨʹϨεϙϯεΛૹ͍ͬͯΔ w ͜ΕΛ1)1ͰͲ͏΍࣮ͬͯݱ͍ͯ͠Δͷ͔ w [FOE@FYFDVUF@FYͷࠩ͠ସ͑ w TUBUFNFOU@IBOEMFSʹΑΔϑοΫ

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[FOE@FYFDVUF@FY w εΫϦϓτ࣮ߦ࣌ʹݺ͹ΕΔؔ਺ϙΠϯλ w σϑΥϧτͷؔ਺ϙΠϯλ͔Βࠩ͠ସ͑Δͱɺؔ਺ݺͼग़͠ͷͨͼʹݺ͹ ΕΔΑ͏ʹͳΔ w ࠷ॳͷ5$1઀ଓͱJOJUύέοτͷૹ৴ w εΫϦϓτ࣮ߦ࣌ʹݺ͹ΕΔ[FOE@FYFDVUF@FYͰ࣮ߦ w ίʔϧελοΫͷ؅ཧ w ؔ਺ݺͼग़͠ͷ[FOE@FYFDVUF@FYͷલޙͰελοΫʹϓογϡϙοϓ

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[FOE@FYFDVUF@FYͷࠩ͠ସ͑ void xdebug_base_minit(INIT_FUNC_ARGS) { // ... xdebug_old_execute_ex = zend_execute_ex; zend_execute_ex = xdebug_execute_ex; xdebug_old_execute_internal = zend_execute_internal; zend_execute_internal = xdebug_execute_internal; // ... } ݩͷ[FOE@FYFDVUF@FYΛPMEʹ଴ආ YEFCVH@FYFDVUF@FYͰؔ਺ϙΠϯλΛ্ॻ͖

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ݩͷ[FOE@FYFDVUF@FYલޙʹॲཧΛೖΕΔ static void xdebug_execute_ex(zend_execute_data *execute_data) { // ... fse = xdebug_add_stack_frame(edata, op_array, XDEBUG_USER_DEFINED); // ... xdebug_old_execute_ex(execute_data); // ... if (XG_BASE(stack)) { xdebug_vector_pop(XG_BASE(stack)); } } ίʔϧελοΫʹϓογϡ ίʔϧελοΫ͔Βϙοϓ ݩͷ[FOE@FYFDVUF@FYΛݺͼग़͠

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TUBUFNFOU@IBOEMFS w ;FOE֦ுͰ͸εςʔτϝϯτ࣮ߦ͝ͱʹϑοΫ͢Δؔ਺ΛࢦఆͰ͖Δ w 9EFCVHͰ͸εςοϓ࣮ߦ΍ϒϨʔΫϙΠϯτͰॲཧΛࢭΊΔͱ͖ʹ ར༻ ZEND_DLEXPORT zend_extension zend_extension_entry = { … xdebug_statement_call, /* statement_handler_func_t */ … };

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CSFBLQPJOUͰݺ͹ΕΔؔ਺ int xdebug_dbgp_breakpoint() { // ... response = xdebug_xml_node_init("response"); xdebug_xml_add_attribute(response, "xmlns", "urn:debugger_protocol_v1"); // ... send_message(context, response); // ... xdebug_dbgp_cmdloop(context, XDEBUG_CMDLOOP_BAIL); // ... 9.-ͷϨεϙϯεΛ࡞੒ ϝοηʔδΛૹ৴ ίϚϯυϧʔϓ

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·ͱΊ w%#(QͱσόοΨͷ࡞ΓํΛ঺հ͠·ͨ͠ w%#(Q͸5$1ͳϓϩτίϧ   ϖΠϩʔυ͸ίϚϯυʴ9.- w%#(QΛ࢖ͬͨσόοΨ͸ൺֱత؆୯ʹ࡞ΕΔͷͰ   օ͞Μ࠷ڧͷσόοΨΛ࡞͍͖ͬͯ·͠ΐ͏💪

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σόοΨͱ஥ྑ͘ͳͬͯ ര଎։ൃ͍͖ͯ͠·͠ΐ͏👍

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͓·͚ඪ४ग़ྗɾΤϥʔग़ྗ΋੍ޚͰ͖Δ stdout -i {id} -c 1 ແޮ ίϐʔ ϦμΠϨΫτ w ΞϓϦέʔγϣϯͷඪ४ग़ྗɾΤϥʔग़ྗΛ   σόοΨʹίϐʔ͢Δ͔ϦμΠϨΫτͤ͞Δ͜ͱ͕Մೳ w ಺༰͸9.-Ͱฦͬͯ͘Δ

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ඪ४ग़ྗͷ9.- ...Base64 Data... w lSFTQPOTFͰ͸ͳ͘lTUSFBNzͰฦͬͯ͘Δ w ίϚϯυϨεϙϯεͷΑ͏ʹҰରʹͳ͓ͬͯΒͣෳ਺ฦͬ ͯ͘ΔͷͰ஫ҙ͕ඞཁ