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Add solutions to 5.4.3

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1 parent 007ef6d commit 7abb9f28e54cb40ce67134bdc3764340a0fb0019 @fastred committed Jan 5, 2013
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  1. +45 −0 5_23.scm
  2. +317 −0 5_24.scm
  3. +346 −0 5_25.scm
  4. +187 −0 ch5-eceval-support.scm
  5. +298 −0 ch5-eceval.scm
  6. +120 −0 ch5-syntax.scm
  7. +12 −0 load-eceval.scm
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+(define (let? exp) (tagged-list? exp 'let))
+(define (let-bindings exp)
+ (cadr exp))
+(define (let-body exp)
+ (cddr exp))
+(define (let-vars bindings)
+ (map car bindings))
+(define (let-values bindings)
+ (map cadr bindings))
+(define (expand-let bindings body)
+ (append (list (make-lambda (let-vars bindings) body))
+ (let-values bindings)))
+(define (let->lambda exp)
+ (expand-let (let-bindings exp) (let-body exp)))
+
+; Changes:
+;
+;(define eceval-operations
+ ;(list
+ ;; ...
+ ;; ...
+ ;(list 'cond? cond?)
+ ;(list 'cond->if cond->if)
+ ;(list 'let? let?)
+ ;(list 'let->lambda let->lambda)
+ ;))
+
+;(define eceval
+ ;(make-machine
+ ;; ...
+ ;; ...
+;eval-dispatch
+ ;; ...
+ ;(test (op cond?) (reg exp))
+ ;(branch (label cond->if))
+ ;(test (op let?) (reg exp))
+ ;(branch (label let->lambda))
+ ;; ...
+;cond->if
+ ;(assign exp (op cond->if exp) (reg exp))
+ ;(goto (label eval-dispatch))
+;let->lambda
+ ;(assign exp (op let->lambda exp) (reg exp))
+ ;(goto (label eval-dispatch))
+ ;; ...
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317 5_24.scm
@@ -0,0 +1,317 @@
+(load "load-eceval.scm")
+
+(define the-global-environment (setup-environment))
+
+(define eceval-operations
+ (list
+ ;;primitive Scheme operations
+ (list 'read read)
+
+ ;;operations in syntax.scm
+ (list 'self-evaluating? self-evaluating?)
+ (list 'quoted? quoted?)
+ (list 'text-of-quotation text-of-quotation)
+ (list 'variable? variable?)
+ (list 'assignment? assignment?)
+ (list 'assignment-variable assignment-variable)
+ (list 'assignment-value assignment-value)
+ (list 'definition? definition?)
+ (list 'definition-variable definition-variable)
+ (list 'definition-value definition-value)
+ (list 'lambda? lambda?)
+ (list 'lambda-parameters lambda-parameters)
+ (list 'lambda-body lambda-body)
+ (list 'if? if?)
+ (list 'if-predicate if-predicate)
+ (list 'if-consequent if-consequent)
+ (list 'if-alternative if-alternative)
+ (list 'begin? begin?)
+ (list 'begin-actions begin-actions)
+ (list 'last-exp? last-exp?)
+ (list 'first-exp first-exp)
+ (list 'rest-exps rest-exps)
+ (list 'application? application?)
+ (list 'operator operator)
+ (list 'operands operands)
+ (list 'no-operands? no-operands?)
+ (list 'first-operand first-operand)
+ (list 'rest-operands rest-operands)
+
+ ;;operations in eceval-support.scm
+ (list 'true? true?)
+ (list 'make-procedure make-procedure)
+ (list 'compound-procedure? compound-procedure?)
+ (list 'procedure-parameters procedure-parameters)
+ (list 'procedure-body procedure-body)
+ (list 'procedure-environment procedure-environment)
+ (list 'extend-environment extend-environment)
+ (list 'lookup-variable-value lookup-variable-value)
+ (list 'set-variable-value! set-variable-value!)
+ (list 'define-variable! define-variable!)
+ (list 'primitive-procedure? primitive-procedure?)
+ (list 'apply-primitive-procedure apply-primitive-procedure)
+ (list 'prompt-for-input prompt-for-input)
+ (list 'announce-output announce-output)
+ (list 'user-print user-print)
+ (list 'empty-arglist empty-arglist)
+ (list 'adjoin-arg adjoin-arg)
+ (list 'last-operand? last-operand?)
+ (list 'no-more-exps? no-more-exps?) ;for non-tail-recursive machine
+ (list 'get-global-environment get-global-environment)
+
+ (list 'cond? cond?)
+ (list 'cond-clauses cond-clauses)
+ (list 'cond-else-clause? cond-else-clause?)
+ (list 'cond-predicate cond-predicate)
+ (list 'cond-actions cond-actions)
+ (list 'first-clause car)
+ (list 'rest-clauses cdr)
+ ))
+
+(define eceval
+ (make-machine
+ '(exp env val proc argl continue unev)
+ eceval-operations
+ '(
+;;SECTION 5.4.4
+read-eval-print-loop
+ (perform (op initialize-stack))
+ (perform
+ (op prompt-for-input) (const ";;; EC-Eval input:"))
+ (assign exp (op read))
+ (assign env (op get-global-environment))
+ (assign continue (label print-result))
+ (goto (label eval-dispatch))
+print-result
+;;**following instruction optional -- if use it, need monitored stack
+ (perform (op print-stack-statistics))
+ (perform
+ (op announce-output) (const ";;; EC-Eval value:"))
+ (perform (op user-print) (reg val))
+ (goto (label read-eval-print-loop))
+
+unknown-expression-type
+ (assign val (const unknown-expression-type-error))
+ (goto (label signal-error))
+
+unknown-procedure-type
+ (restore continue)
+ (assign val (const unknown-procedure-type-error))
+ (goto (label signal-error))
+
+signal-error
+ (perform (op user-print) (reg val))
+ (goto (label read-eval-print-loop))
+
+;;SECTION 5.4.1
+eval-dispatch
+ (test (op self-evaluating?) (reg exp))
+ (branch (label ev-self-eval))
+ (test (op variable?) (reg exp))
+ (branch (label ev-variable))
+ (test (op quoted?) (reg exp))
+ (branch (label ev-quoted))
+ (test (op assignment?) (reg exp))
+ (branch (label ev-assignment))
+ (test (op definition?) (reg exp))
+ (branch (label ev-definition))
+ (test (op if?) (reg exp))
+ (branch (label ev-if))
+ (test (op lambda?) (reg exp))
+ (branch (label ev-lambda))
+ (test (op begin?) (reg exp))
+ (branch (label ev-begin))
+ (test (op cond?) (reg exp))
+ ;; new instructions
+ (branch (label ev-cond))
+ (test (op application?) (reg exp))
+ (branch (label ev-application))
+ (goto (label unknown-expression-type))
+
+ev-self-eval
+ (assign val (reg exp))
+ (goto (reg continue))
+ev-variable
+ (assign val (op lookup-variable-value) (reg exp) (reg env))
+ (goto (reg continue))
+ev-quoted
+ (assign val (op text-of-quotation) (reg exp))
+ (goto (reg continue))
+ev-lambda
+ (assign unev (op lambda-parameters) (reg exp))
+ (assign exp (op lambda-body) (reg exp))
+ (assign val (op make-procedure)
+ (reg unev) (reg exp) (reg env))
+ (goto (reg continue))
+
+ev-application
+ (save continue)
+ (save env)
+ (assign unev (op operands) (reg exp))
+ (save unev)
+ (assign exp (op operator) (reg exp))
+ (assign continue (label ev-appl-did-operator))
+ (goto (label eval-dispatch))
+ev-appl-did-operator
+ (restore unev)
+ (restore env)
+ (assign argl (op empty-arglist))
+ (assign proc (reg val))
+ (test (op no-operands?) (reg unev))
+ (branch (label apply-dispatch))
+ (save proc)
+ev-appl-operand-loop
+ (save argl)
+ (assign exp (op first-operand) (reg unev))
+ (test (op last-operand?) (reg unev))
+ (branch (label ev-appl-last-arg))
+ (save env)
+ (save unev)
+ (assign continue (label ev-appl-accumulate-arg))
+ (goto (label eval-dispatch))
+ev-appl-accumulate-arg
+ (restore unev)
+ (restore env)
+ (restore argl)
+ (assign argl (op adjoin-arg) (reg val) (reg argl))
+ (assign unev (op rest-operands) (reg unev))
+ (goto (label ev-appl-operand-loop))
+ev-appl-last-arg
+ (assign continue (label ev-appl-accum-last-arg))
+ (goto (label eval-dispatch))
+ev-appl-accum-last-arg
+ (restore argl)
+ (assign argl (op adjoin-arg) (reg val) (reg argl))
+ (restore proc)
+ (goto (label apply-dispatch))
+apply-dispatch
+ (test (op primitive-procedure?) (reg proc))
+ (branch (label primitive-apply))
+ (test (op compound-procedure?) (reg proc))
+ (branch (label compound-apply))
+ (goto (label unknown-procedure-type))
+
+primitive-apply
+ (assign val (op apply-primitive-procedure)
+ (reg proc)
+ (reg argl))
+ (restore continue)
+ (goto (reg continue))
+
+compound-apply
+ (assign unev (op procedure-parameters) (reg proc))
+ (assign env (op procedure-environment) (reg proc))
+ (assign env (op extend-environment)
+ (reg unev) (reg argl) (reg env))
+ (assign unev (op procedure-body) (reg proc))
+ (goto (label ev-sequence))
+
+;;;SECTION 5.4.2
+ev-begin
+ (assign unev (op begin-actions) (reg exp))
+ (save continue)
+ (goto (label ev-sequence))
+
+ev-sequence
+ (assign exp (op first-exp) (reg unev))
+ (test (op last-exp?) (reg unev))
+ (branch (label ev-sequence-last-exp))
+ (save unev)
+ (save env)
+ (assign continue (label ev-sequence-continue))
+ (goto (label eval-dispatch))
+ev-sequence-continue
+ (restore env)
+ (restore unev)
+ (assign unev (op rest-exps) (reg unev))
+ (goto (label ev-sequence))
+ev-sequence-last-exp
+ (restore continue)
+ (goto (label eval-dispatch))
+
+;;;SECTION 5.4.3
+
+ev-if
+ (save exp)
+ (save env)
+ (save continue)
+ (assign continue (label ev-if-decide))
+ (assign exp (op if-predicate) (reg exp))
+ (goto (label eval-dispatch))
+ev-if-decide
+ (restore continue)
+ (restore env)
+ (restore exp)
+ (test (op true?) (reg val))
+ (branch (label ev-if-consequent))
+ev-if-alternative
+ (assign exp (op if-alternative) (reg exp))
+ (goto (label eval-dispatch))
+ev-if-consequent
+ (assign exp (op if-consequent) (reg exp))
+ (goto (label eval-dispatch))
+
+ev-assignment
+ (assign unev (op assignment-variable) (reg exp))
+ (save unev)
+ (assign exp (op assignment-value) (reg exp))
+ (save env)
+ (save continue)
+ (assign continue (label ev-assignment-1))
+ (goto (label eval-dispatch))
+ev-assignment-1
+ (restore continue)
+ (restore env)
+ (restore unev)
+ (perform
+ (op set-variable-value!) (reg unev) (reg val) (reg env))
+ (assign val (const ok))
+ (goto (reg continue))
+
+ev-definition
+ (assign unev (op definition-variable) (reg exp))
+ (save unev)
+ (assign exp (op definition-value) (reg exp))
+ (save env)
+ (save continue)
+ (assign continue (label ev-definition-1))
+ (goto (label eval-dispatch))
+ev-definition-1
+ (restore continue)
+ (restore env)
+ (restore unev)
+ (perform
+ (op define-variable!) (reg unev) (reg val) (reg env))
+ (assign val (const ok))
+ (goto (reg continue))
+
+;; new instructions for cond
+ev-cond
+ (assign unev (op cond-clauses) (reg exp))
+ (save env)
+ (save continue)
+ev-cond-loop
+ (assign exp (op first-clause) (reg unev))
+ (test (op cond-else-clause?) (reg exp))
+ (branch (label ev-cond-found))
+ (save unev)
+ (assign continue (label ev-cond-decide))
+ (assign exp (op cond-predicate) (reg exp)) ; exp contains predicate
+ (goto (label eval-dispatch))
+ev-cond-decide
+ (restore unev)
+ (test (op true?) (reg val))
+ (branch (label ev-cond-found))
+ (assign unev (op rest-clauses) (reg unev))
+ (goto (label ev-cond-loop))
+ev-cond-found
+ (restore continue)
+ (restore env)
+ (save continue)
+ (assign exp (op first-clause) (reg unev))
+ (assign exp (op cond-actions) (reg exp))
+ (assign unev (reg exp))
+ (goto (label ev-sequence))
+ )))
+
+(start eceval)
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