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23 lines
1.1 KiB
Org Mode
23 lines
1.1 KiB
Org Mode
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#+TITLE: 5.4 - The Explicit-Control Evaluator
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#+STARTUP: indent
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#+OPTIONS: num:nil
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#+PROPERTY: header-args:scheme :tangle yes
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#+BEGIN_QUOTE
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With the implementation of the explicit-control evaluator we come to
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the end of a development, begun in Chapter 1, in which we have
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explored successively more precise models of the evaluation
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process. We started with the relatively informal substitution model,
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then extended this in Chapter 3 to the environment model, which
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enabled us to deal with state and change. In the metacircular
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evaluator of Chapter 4, we used Scheme itself as a language for making
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more explicit the environment structure constructed during evaluation
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of an expression. Now, with register machines, we have taken a close
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look at the evaluator’s mechanisms for storage management, argument
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passing, and control. At each new level of description, we have had to
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raise issues and resolve ambiguities that were not apparent at the
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previous, less precise treatment of evaluation. To understand the
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behavior of the explicit-control evaluator, we can simulate it and
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monitor its performance.
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#+END_QUOTE
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