<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=gb2312"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=ZH-CN link="#0563C1" vlink="#954F72" style='text-justify-trim:punctuation'><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Dear all,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>We have committed a PR to support dynamic class loading and class serialization/deserialization in SubstrateVM.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><a href="https://urldefense.com/v3/__https://github.com/oracle/graal/pull/2323__;!!GqivPVa7Brio!I9JJfIe3JyijYwHeZxP1gfgmWYa6h2H6FoD6rGzqiOGK40VXyMOYIMfamEmtMVLLXT6n9A$">https://github.com/oracle/graal/pull/2323</a><o:p></o:p></span></p><p class=MsoNormal align=left style='margin-bottom:12.0pt;text-align:left'><span lang=EN-US style='font-family:"Segoe UI",sans-serif;color:#24292E'>The basic idea for supporting dynamic class loading is dumping classes generated at run time in a beforehand run with native-image-agent to a specified directory which is added to the classpath to build native-image. Serialization/deserialization is basically dynamic class loading + reflection.<br>This is implemented in 3 steps:<o:p></o:p></span></p><ol start=1 type=1><li class=MsoNormal style='color:#24292E;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-align:left;mso-list:l0 level1 lfo1'><span lang=EN-US style='font-family:"Segoe UI",sans-serif'>Intercept java.lang.ClassLoader.postDefineClass and sun.reflect.ClassDefiner.defineClass by native-image-agent to dump the dynamically generated class to file system.<o:p></o:p></span></li><li class=MsoNormal style='color:#24292E;margin-top:2.65pt;mso-margin-bottom-alt:auto;text-align:left;mso-list:l0 level1 lfo1'><span lang=EN-US style='font-family:"Segoe UI",sans-serif'>Make sure the generated classes' names are fixed through Hotspot version runtime and native-image version runtime.<o:p></o:p></span></li><li class=MsoNormal style='color:#24292E;margin-top:2.65pt;mso-margin-bottom-alt:auto;text-align:left;mso-list:l0 level1 lfo1'><span lang=EN-US style='font-family:"Segoe UI",sans-serif'>Substitute relevant classes in SubstrateVM to load the previously dumped classes.<o:p></o:p></span></li></ol><p class=MsoNormal><span lang=EN-US>More details can be found the PR.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Ziyi Lin<o:p></o:p></span></p></div></body></html>