How to implement heap types for a custom JVM…
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How to implement heap types for a custom JVM implementation?
Hello,
Last week, I watched a video about one of the most popular J2ME games of the 2000s, "Diamond Rush", and decided to reverse engineer it by building a small JVM implementation. My initial goal is to run the game on Linux and macOS, and later port it to microcontrollers.
So far, I have completed the class loading stage. I can parse and load class files, store them, and dump their contents for debugging. I have also implemented some of the simpler parts and opcodes of the JVM by following the JVM specs.
Nonetheless, I am struggling with implementing heap types and most of the obfuscated class files have 0xBC (new_array) opcode. The specification feels somewhat vague in this regard, and I am unsure what is the best approach would be.
I would appreciate any advice on how to approach implementing heap types in a custom JVM. In particular, what data structures or object model would you recommend, and how should different heap-allocated values be represented internally?
#technology
source
Hello,
Last week, I watched a video about one of the most popular J2ME games of the 2000s, "Diamond Rush", and decided to reverse engineer it by building a small JVM implementation. My initial goal is to run the game on Linux and macOS, and later port it to microcontrollers.
So far, I have completed the class loading stage. I can parse and load class files, store them, and dump their contents for debugging. I have also implemented some of the simpler parts and opcodes of the JVM by following the JVM specs.
Nonetheless, I am struggling with implementing heap types and most of the obfuscated class files have 0xBC (new_array) opcode. The specification feels somewhat vague in this regard, and I am unsure what is the best approach would be.
I would appreciate any advice on how to approach implementing heap types in a custom JVM. In particular, what data structures or object model would you recommend, and how should different heap-allocated values be represented internally?
#technology
source
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