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The Just-In-Time (JIT) compiler is a component of the runtime environment that improves the performance of Java™ applications by compiling bytecodes to native machine code at run time.
To help the JIT compiler analyze the method, its bytecodes are first reformulated in an internal representation called trees, which resembles machine code more closely than bytecodes. Analysis and optimizations are then performed on the trees of the method. At the end, the trees are translated into native code.
Just-In-Time compiler(JIT) is a part of Common Language Runtime (CLR) in . NET which is responsible for managing the execution of . NET programs regardless of any . NET programming language. A language-specific compiler converts the source code to the intermediate language.
There are three types of JIT compilers: Pre-JIT: Compiles the entire source code during compilation and is used at the time of deployment. Econo-JIT:Compiles methods that are called during run time.
How does a virtual machine generate native machine code on the fly and execute it?
Assuming you can figure out what are the native machine op-codes you want to emit, how do you go about actually running it?
Is it something as hacky as mapping the mnemonic instructions to binary codes, stuffing it into an char* pointer and casting it as a function and executing?
Or would you generate a temporary shared library (.dll or .so or whatever) and load it into memory using standard functions like LoadLibrary ?
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