mini_jvm

Mini jvm is a java vm (java virtual machine) for iOS, Android. implemented in C , small mem footprint, startup quikly, support thread ,native method, garbage collection ,java debug and more.

Feature:

Java runtime classlib ported from CLDC1.1 .
Support java5/6/7/8 class file version .
Little.endian and big.endian supported.
Java garbage collection supported .
Java remote debug supported, transport by JDWP .
Java Thread supported ,need ld flag -lpthread .
Java native method supported.
Java network supported ,Socket/ServerSocket/Http etc .
Java file supported.

Directories:

mini_jvm/javalib/------------------ java foundation class
mini_jvm/javalib_test/------------- java foundation class for test ,few class java.lang.*
mini_jvm/mini_jvm/jvm/------------- mini jvm c source ,jvm
mini_jvm/mini_jvm/utils/----------- c ,type def and containers.
mini_jvm/mini_jvm/utils/cmem/------ c ,memory leak detect, change: utils/d_type.h: #define __MEM_LEAK_DETECT
mini_jvm/mini_jvm/iostest/--------- ios swift test project.

Compiled and tested in 32bit mingw / 64bit cygwin / MacOS /iOS/Linux CentOS64 .
C code: (mini_jvm/jvm; mini_jvm/utils) develop by JetBrains CLion, MinGW 5.0 or Cygwin 2.8.2. ,c99 evn. Swift code: (mini_jvm/iostests) develop by XCode , LLVM 9 .
Java code: (javalib; javalib_test) develop by Netbeans 8.0 ,jdk 1.8 , User class compile must be with these foundation classes.
The mini_jvm designed for resource limited device, iOS, Android, or other embedded device.
for this work reference : sun cldc, ntu.android/simple_vm ,zhangkari/jvm ,CppArchMasters/lightweight.java.vm and more in github.

Deploy:

Download github project.
Compile java classes to mini_jvm/javalib/build/classes/ , or you can open the project mini_jvm/javalib/ in Netbeans,then build .
Open JetBrains Clion project (cmake) mini_jvm/mini_jvm/ ,setup mingw /cygwin /linux /mac xcode env, build and run .

Remote debug:

Ensure that mini_jvm is running .
Open intelli idea ,open the java project , menu Run .> Edit Configurations , + remote , Transport : socket , Debugger mode : attach , host is your mini_jvm running at host ip, port : 8000 .
Eclipse's configuration like as idea .
If you are using Netbeans , open java project , menu Debug .> connect to Debugger, Connector : SocketAttach , host is your mini_jvm running at the host, port : 8000 , Timeout: 10000 .
Then you can set breakpoint or pause mini_jvm and watch variable value .

License

License: BSD

Gust , [email protected] , Technology and production manage in EGLS ltd. EGLS is a game develop company in China .