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16 lines
926 B
16 lines
926 B
2 years ago
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Exercise 5.42: Using find-variable from
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Exercise 5.41, rewrite compile-variable and
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compile-assignment to output lexical-address instructions. In cases
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where find-variable returns not-found (that is, where the
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variable is not in the compile-time environment), you should have the code
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generators use the evaluator operations, as before, to search for the binding.
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(The only place a variable that is not found at compile time can be is in the
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global environment, which is part of the run-time environment but is not part
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of the compile-time environment.332 Thus, if you wish, you may have the evaluator operations look
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directly in the global environment, which can be obtained with the operation
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(op get-global-environment), instead of having them search the whole
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run-time environment found in env.) Test the modified compiler on a few
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simple cases, such as the nested lambda combination at the beginning of
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this section.
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