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SICP 問題 5.35

本文の図5.18 の翻訳出力の例から翻訳前の式を導く.

答え

(compile
 '(define (f x)
    (+ x (g (+ x 2))))
 'val 'next)

実行結果(整形済み)

((env)
 (val)
 ((assign val (op make-compiled-procedure) (label entry12) (reg env))
  (goto (label after-lambda13))
  entry12
  (assign env (op compiled-procedure-env) (reg proc))
  (assign env (op extend-environment) (const (x)) (reg argl) (reg env))
  (assign proc (op lookup-variable-value) (const +) (reg env))
  (save continue)
  (save proc)
  (save env)
  (assign proc (op lookup-variable-value) (const g) (reg env))
  (save proc)
  (assign proc (op lookup-variable-value) (const +) (reg env))
  (assign val (const 2))
  (assign argl (op list) (reg val))
  (assign val (op lookup-variable-value) (const x) (reg env))
  (assign argl (op cons) (reg val) (reg argl))
  (test (op primitive-procedure?) (reg proc))
  (branch (label primitive-branch14))
  compiled-branch15
  (assign continue (label after-call16))
  (assign val (op compiled-procedure-entry) (reg proc))
  (goto (reg val))
  primitive-branch14
  (assign val (op apply-primitive-procedure) (reg proc) (reg argl))
  after-call16
  (assign argl (op list) (reg val))
  (restore proc)
  (test (op primitive-procedure?) (reg proc))
  (branch (label primitive-branch17))
  compiled-branch18
  (assign continue (label after-call19))
  (assign val (op compiled-procedure-entry) (reg proc))
  (goto (reg val))
  primitive-branch17
  (assign val (op apply-primitive-procedure) (reg proc) (reg argl))
  after-call19
  (assign argl (op list) (reg val))
  (restore env)
  (assign val (op lookup-variable-value) (const x) (reg env))
  (assign argl (op cons) (reg val) (reg argl))
  (restore proc)
  (restore continue)
  (test (op primitive-procedure?) (reg proc))
  (branch (label primitive-branch20))
  compiled-branch21
  (assign val (op compiled-procedure-entry) (reg proc))
  (goto (reg val))
  primitive-branch20
  (assign val (op apply-primitive-procedure) (reg proc) (reg argl))
  (goto (reg continue))
  after-call22
  after-lambda13
  (perform (op define-variable!) (const f) (reg val) (reg env))
  (assign val (const ok))
  ))

本文のコードとlabelの番号以外は一致.