>> JIT only compile for the first time of a class was loaded. Subsequent calls will find code to execute through class loader's stub.
"once compiled, the native code lies in memory until the process shut down and until the garbage collector clears off all references and memory associated with the process."
>> PE file(IL and metadata) -> Type safe security -> JIT (to native code) -> optimization for target machine (e.g. one cpu or two cpus.)
>> CLR provide interface for compiler to create code controlling execution.
.net security: declarative and imperative.
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