e-jvm
Projeto criado com a finalidade de aprendizado, e o melhor conhecimento de uma VM.
Projeto segue documentação oficial, implementando corretamente de acordo com documentação os bytecodes,
e a estrutura de classes que um compilador Java.
Projeto criado em 2012, migrado de http://code.google.com/p/e-jvm/, infelizmente na migração foi perdido todo o histórico do SVN.
Não pretendo dar continuidade ao projeto, em 2017 fiz um último update de adaptar o projeto ao CMake.
An embedded java virtual machine.
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The best link I use to understand and create this JVM version. This link is a specification for JVM, this is the most important link, all I've needed is there, but I need more to understand then google is the best friend.
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http://docs.oracle.com/javase/specs/jvms/se7/html/index.html
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It's good to understand how jvm process method, thread.
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http://www.cubrid.org/blog/dev-platform/understanding-jvm-internals/
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This is the process to load and initialize a class in JVM. I need to create these 5 steps to improve the JVM.
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Loading: A class is obtained from a file and loaded to the JVM memory. --> This process is too sample, only create a class to find file in path (CLASSPATH) and read all file into memory.
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Verifying: Check whether or not the read class is configured as described in the Java Language Specification and JVM specifications.
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This is the most complicated test process of the class load processes, and takes the longest time.
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Most cases of the JVM TCK test cases are to test whether or not a verification error occurs by loading wrong classes. --> This is a little more complicate, need to validate all class read before.
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Preparing: Prepare a data structure that assigns the memory required by classes and indicates the fields, methods, and interfaces defined in the class. --> I can do this step together with before step, It's too sample.
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Resolving: Change all symbolic references in the constant pool of the class to direct references. --> I do. This process is not complicate but I need create this to improve speed for load classes in runtime execution. If constant Pool references a class then I need load this, before I need to use that.
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Initializing: Initialize the class variables to proper values. Execute the static initializers and initialize the static fields to the configured values. --> Today I don't do this.
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TODOs
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1- Some instruction are specific for a type, e.g iadd this instruction must add two int.
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Today any instruction are validantig their parameters.
Compile
Set your boost library on CMakeLists.txt and build your project