5.5.6. Lexical Addressing
Exercise 5.42

Compile-variable and compile-assignment with lexical-address instructions

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


Nobody's finished this exercise yet. You'll be the first!


There are no comments yet.

Authentication required

You must log in to post a comment.

Login