5-3, 5-4

5-3.org

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+#+TITLE: 5.3 - Storage Allocation and Garbage Collection
+#+STARTUP: indent
+#+OPTIONS: num:nil
+#+PROPERTY: header-args:scheme :tangle yes

5-4.org

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