Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. An ahead-of-time (AOT) compiler is a compiler that implements ahead-of-time compilation. This refers to the act of compiling an intermediate language, such as Java bytecode, .NET Common Intermediate Language (CIL), or IBM System/38 or IBM System i "Technology Independent Machine Interface" code, into a system-dependent binary. Most languages with a managed runtime that can be compiled to an intermediate language take advantage of just-in-time (JIT). This, briefly, compiles intermediate code into binary code for a native run while the intermediate code is executing, which may decrease an application's performance. Ahead-of-time compilation eliminates the need for this step by performing the compilation before execution rather than during execution.

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