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\documentclass{article}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\usepackage{../style}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\usepackage{../langs}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\begin{document}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\section*{Handout 7 (Compilation)}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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The purpose of a compiler is to transform a program, a human
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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can write, into code the machine can run as fast as possible.
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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The fastest code would be machine code the CPU can run
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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directly, but it is often enough to improve the speed of a
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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program by just targeting a virtual machine. This produces not
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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the fastest possible code, but code that is fast enough and
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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has the advantage that the virtual machine care of things a
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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compiler would normally need to take care of (like explicit
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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memory management).
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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We will be generating code for the Java Virtual Machine. This
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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is a stack-based virtual machine which will make it easy to
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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generate code for arithmetic expressions. Recall
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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that our
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\end{document}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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%%% Local Variables:
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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%%% mode: latex
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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%%% TeX-master: t
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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%%% End:
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