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    <p>As Jon Skeet says, JIT is part of the CLR. Basically this is what is happening under the hood:</p> <ol> <li>Your source code is compiled into a byte code know as the common intermediate language (CIL).</li> <li>Metadata from every class and every methods (and every other thing :O) is included in the PE header of the resulting executable (be it a dll or an exe).</li> <li>If you're producing an executable the PE Header also includes a conventional bootstrapper which is in charge of loading the CLR (Common language runtime) when you execute you executable.</li> </ol> <p>Now, when you execute:</p> <ol> <li>The bootstraper initializes the CLR (mainly by loading the mscorlib assembly) and instructs it to execute your assembly.</li> <li>The CLR executes your main entry.</li> <li>Now, classes have a vector table which hold the addresses of the method functions, so that when you call MyMethod, this table is searched and then a corresponding call to the address is made. Upon start ALL entries for all tables have the address of the JIT compiler.</li> <li>When a call to one of such method is made, the JIT is invoked instead of the actual method and takes control. The JIT then compiles the CIL code into actual assembly code for the appropiate architecture.</li> <li>Once the code is compiled the JIT goes into the method vector table <strong>and replaces the address with the one of the compiled code, so that every subsequent call no longer invokes the JIT.</strong></li> <li>Finally, the JIT handles the execution to the compiled code.</li> <li>If you call another method which haven't yet being compiled then go back to 4... and so on...</li> </ol>
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    1. POCLR vs JIT
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    1. USJorge Córdoba
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    1. CODammit! Stop calling it bytecode, it's IL, an intermediate language representation. As the size of IL instructions are 16-bit words.
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      1. USJohn Leidegren
    2. COI fear you are fighting a losing battle on this one John :) I think "Intermediate code" is reasonable general term where you want to include java's, 'net's, LLVM's etc. but dammit if bytecode isn't snappy...
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    3. COIf you talk bytecode, I would presume you where talking about Java bytecode. If you say IL, I'll presume you are talking about the .NET platform. It's as simple as that. I want to keep that distinction alive.
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