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|
;;; Guile High Intermediate Language
;; Copyright (C) 2001 Free Software Foundation, Inc.
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;;
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with this program; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Code:
(define-module (system il ghil)
#:use-syntax (system base syntax)
#:use-module (ice-9 regex)
#:export
(<ghil-void> make-ghil-void ghil-void?
ghil-void-env ghil-void-loc
<ghil-quote> make-ghil-quote ghil-quote?
ghil-quote-env ghil-quote-loc ghil-quote-obj
<ghil-quasiquote> make-ghil-quasiquote ghil-quasiquote?
ghil-quasiquote-env ghil-quasiquote-loc ghil-quasiquote-exp
<ghil-unquote> make-ghil-unquote ghil-unquote?
ghil-unquote-env ghil-unquote-loc ghil-unquote-exp
<ghil-unquote-splicing> make-ghil-unquote-splicing ghil-unquote-splicing?
ghil-unquote-env ghil-unquote-loc ghil-unquote-exp
<ghil-ref> make-ghil-ref ghil-ref?
ghil-ref-env ghil-ref-loc ghil-ref-var
<ghil-set> make-ghil-set ghil-set?
ghil-set-env ghil-set-loc ghil-set-var ghil-set-val
<ghil-define> make-ghil-define ghil-define?
ghil-define-env ghil-define-loc ghil-define-var ghil-define-val
<ghil-if> make-ghil-if ghil-if?
ghil-if-env ghil-if-loc ghil-if-test ghil-if-then ghil-if-else
<ghil-and> make-ghil-and ghil-and?
ghil-and-env ghil-and-loc ghil-and-exps
<ghil-or> make-ghil-or ghil-or?
ghil-or-env ghil-or-loc ghil-or-exps
<ghil-begin> make-ghil-begin ghil-begin?
ghil-begin-env ghil-begin-loc ghil-begin-exps
<ghil-bind> make-ghil-bind ghil-bind?
ghil-bind-env ghil-bind-loc ghil-bind-vars ghil-bind-vals ghil-bind-body
<ghil-mv-bind> make-ghil-mv-bind ghil-mv-bind?
ghil-mv-bind-env ghil-mv-bind-loc ghil-mv-bind-producer ghil-mv-bind-vars ghil-mv-bind-rest ghil-mv-bind-body
<ghil-lambda> make-ghil-lambda ghil-lambda?
ghil-lambda-env ghil-lambda-loc ghil-lambda-vars ghil-lambda-rest
ghil-lambda-meta ghil-lambda-body
<ghil-inline> make-ghil-inline ghil-inline?
ghil-inline-env ghil-inline-loc ghil-inline-inline ghil-inline-args
<ghil-call> make-ghil-call ghil-call?
ghil-call-env ghil-call-loc ghil-call-proc ghil-call-args
<ghil-mv-call> make-ghil-mv-call ghil-mv-call?
ghil-mv-call-env ghil-mv-call-loc ghil-mv-call-producer ghil-mv-call-consumer
<ghil-values> make-ghil-values ghil-values?
ghil-values-env ghil-values-loc ghil-values-values
<ghil-values*> make-ghil-values* ghil-values*?
ghil-values*-env ghil-values*-loc ghil-values*-values
<ghil-var> make-ghil-var ghil-var?
ghil-var-env ghil-var-name ghil-var-kind ghil-var-index
<ghil-toplevel-env> make-ghil-toplevel-env ghil-toplevel-env?
ghil-toplevel-env-table
<ghil-env> make-ghil-env ghil-env?
ghil-env-parent ghil-env-table ghil-env-variables
ghil-env-add!
ghil-var-is-bound? ghil-var-for-ref! ghil-var-for-set! ghil-var-define!
ghil-var-at-module!
call-with-ghil-environment call-with-ghil-bindings))
;;;
;;; Parse tree
;;;
(define-type <ghil>
(|
;; Objects
(<ghil-void> env loc)
(<ghil-quote> env loc obj)
(<ghil-quasiquote> env loc exp)
(<ghil-unquote> env loc exp)
(<ghil-unquote-splicing> env loc exp)
;; Variables
(<ghil-ref> env loc var)
(<ghil-set> env loc var val)
(<ghil-define> env loc var val)
;; Controls
(<ghil-if> env loc test then else)
(<ghil-and> env loc exps)
(<ghil-or> env loc exps)
(<ghil-begin> env loc exps)
(<ghil-bind> env loc vars vals body)
(<ghil-mv-bind> env loc producer vars rest body)
(<ghil-lambda> env loc vars rest meta body)
(<ghil-call> env loc proc args)
(<ghil-mv-call> env loc producer consumer)
(<ghil-inline> env loc inline args)
(<ghil-values> env loc values)
(<ghil-values*> env loc values)))
;;;
;;; Variables
;;;
(define-record (<ghil-var> env name kind (index #f)))
;;;
;;; Modules
;;;
;;;
;;; Environments
;;;
(define-record (<ghil-env> parent (table '()) (variables '())))
(define-record (<ghil-toplevel-env> (table '())))
(define (ghil-env-ref env sym)
(assq-ref (ghil-env-table env) sym))
(define-macro (push! item loc)
`(set! ,loc (cons ,item ,loc)))
(define-macro (apush! k v loc)
`(set! ,loc (acons ,k ,v ,loc)))
(define-macro (apopq! k loc)
`(set! ,loc (assq-remove! ,loc ,k)))
(define (ghil-env-add! env var)
(apush! (ghil-var-name var) var (ghil-env-table env))
(push! var (ghil-env-variables env)))
(define (ghil-env-remove! env var)
(apopq! (ghil-var-name var) (ghil-env-table env)))
(define (force-heap-allocation! var)
(set! (ghil-var-kind var) 'external))
;;;
;;; Public interface
;;;
;; The following four functions used to be one, in ghil-lookup. Now they
;; are four, to reflect the different intents. A bit of duplication, but
;; that's OK. The common current is to find out where a variable will be
;; stored at runtime.
;;
;; These functions first search the lexical environments. If the
;; variable is not in the innermost environment, make sure the variable
;; is marked as being "external" so that it goes on the heap. If the
;; variable is being modified (via a set!), also make sure it's on the
;; heap, so that other continuations see the changes to the var.
;;
;; If the variable is not found lexically, it is a toplevel variable,
;; which will be looked up at runtime with respect to the module that
;; was current when the lambda was bound, at runtime. The variable will
;; be resolved when it is first used.
(define (ghil-var-is-bound? env sym)
(let loop ((e env))
(record-case e
((<ghil-toplevel-env> table)
(let ((key (cons (module-name (current-module)) sym)))
(assoc-ref table key)))
((<ghil-env> parent table variables)
(and (not (assq-ref table sym))
(loop parent))))))
(define (ghil-var-for-ref! env sym)
(let loop ((e env))
(record-case e
((<ghil-toplevel-env> table)
(let ((key (cons (module-name (current-module)) sym)))
(or (assoc-ref table key)
(let ((var (make-ghil-var (car key) (cdr key) 'toplevel)))
(apush! key var (ghil-toplevel-env-table e))
var))))
((<ghil-env> parent table variables)
(cond
((assq-ref table sym)
=> (lambda (var)
(or (eq? e env)
(force-heap-allocation! var))
var))
(else
(loop parent)))))))
(define (ghil-var-for-set! env sym)
(let loop ((e env))
(record-case e
((<ghil-toplevel-env> table)
(let ((key (cons (module-name (current-module)) sym)))
(or (assoc-ref table key)
(let ((var (make-ghil-var (car key) (cdr key) 'toplevel)))
(apush! key var (ghil-toplevel-env-table e))
var))))
((<ghil-env> parent table variables)
(cond
((assq-ref table sym)
=> (lambda (var)
(force-heap-allocation! var)
var))
(else
(loop parent)))))))
(define (ghil-var-at-module! env modname sym interface?)
(let loop ((e env))
(record-case e
((<ghil-toplevel-env> table)
(let ((key (list modname sym interface?)))
(or (assoc-ref table key)
(let ((var (make-ghil-var modname sym
(if interface? 'public 'private))))
(apush! key var (ghil-toplevel-env-table e))
var))))
((<ghil-env> parent table variables)
(loop parent)))))
(define (ghil-var-define! toplevel sym)
(let ((key (cons (module-name (current-module)) sym)))
(or (assoc-ref (ghil-toplevel-env-table toplevel) key)
(let ((var (make-ghil-var (car key) (cdr key) 'toplevel)))
(apush! key var (ghil-toplevel-env-table toplevel))
var))))
(define (call-with-ghil-environment e syms func)
(let* ((e (make-ghil-env e))
(vars (map (lambda (s)
(let ((v (make-ghil-var e s 'argument)))
(ghil-env-add! e v) v))
syms)))
(func e vars)))
(define (call-with-ghil-bindings e syms func)
(let* ((vars (map (lambda (s)
(let ((v (make-ghil-var e s 'local)))
(ghil-env-add! e v) v))
syms))
(ret (func vars)))
(for-each (lambda (v) (ghil-env-remove! e v)) vars)
ret))
;;;
;;; Parser
;;;
;;; (define-public (parse-ghil x e)
;;; (parse `(@lambda () ,x) (make-ghil-mod e)))
;;;
;;; (define (parse x e)
;;; (cond ((pair? x) (parse-pair x e))
;;; ((symbol? x)
;;; (let ((str (symbol->string x)))
;;; (case (string-ref str 0)
;;; ((#\@) (error "Invalid use of IL primitive" x))
;;; ((#\:) (let ((sym (string->symbol (substring str 1))))
;;; (<ghil-quote> (symbol->keyword sym))))
;;; (else (<ghil-ref> e (ghil-lookup e x))))))
;;; (else (<ghil-quote> x))))
;;;
;;; (define (map-parse x e)
;;; (map (lambda (x) (parse x e)) x))
;;;
;;; (define (parse-pair x e)
;;; (let ((head (car x)) (tail (cdr x)))
;;; (if (and (symbol? head) (eq? (string-ref (symbol->string head) 0) #\@))
;;; (if (ghil-primitive-macro? head)
;;; (parse (apply (ghil-macro-expander head) tail) e)
;;; (parse-primitive head tail e))
;;; (<ghil-call> e (parse head e) (map-parse tail e)))))
;;;
;;; (define (parse-primitive prim args e)
;;; (case prim
;;; ;; (@ IDENTIFIER)
;;; ((@)
;;; (match args
;;; (()
;;; (<ghil-ref> e (make-ghil-var '@ '@ 'module)))
;;; ((identifier)
;;; (receive (module name) (identifier-split identifier)
;;; (<ghil-ref> e (make-ghil-var module name 'module))))))
;;;
;;; ;; (@@ OP ARGS...)
;;; ((@@)
;;; (match args
;;; ((op . args)
;;; (<ghil-inline> op (map-parse args e)))))
;;;
;;; ;; (@void)
;;; ((@void)
;;; (match args
;;; (() (<ghil-void>))))
;;;
;;; ;; (@quote OBJ)
;;; ((@quote)
;;; (match args
;;; ((obj)
;;; (<ghil-quote> obj))))
;;;
;;; ;; (@define NAME VAL)
;;; ((@define)
;;; (match args
;;; ((name val)
;;; (let ((v (ghil-lookup e name)))
;;; (<ghil-set> e v (parse val e))))))
;;;
;;; ;; (@set! NAME VAL)
;;; ((@set!)
;;; (match args
;;; ((name val)
;;; (let ((v (ghil-lookup e name)))
;;; (<ghil-set> e v (parse val e))))))
;;;
;;; ;; (@if TEST THEN [ELSE])
;;; ((@if)
;;; (match args
;;; ((test then)
;;; (<ghil-if> (parse test e) (parse then e) (<ghil-void>)))
;;; ((test then else)
;;; (<ghil-if> (parse test e) (parse then e) (parse else e)))))
;;;
;;; ;; (@begin BODY...)
;;; ((@begin)
;;; (parse-body args e))
;;;
;;; ;; (@let ((SYM INIT)...) BODY...)
;;; ((@let)
;;; (match args
;;; ((((sym init) ...) body ...)
;;; (let* ((vals (map-parse init e))
;;; (vars (map (lambda (s)
;;; (let ((v (make-ghil-var e s 'local)))
;;; (ghil-env-add! e v) v))
;;; sym))
;;; (body (parse-body body e)))
;;; (for-each (lambda (v) (ghil-env-remove! e v)) vars)
;;; (<ghil-bind> e vars vals body)))))
;;;
;;; ;; (@letrec ((SYM INIT)...) BODY...)
;;; ((@letrec)
;;; (match args
;;; ((((sym init) ...) body ...)
;;; (let* ((vars (map (lambda (s)
;;; (let ((v (make-ghil-var e s 'local)))
;;; (ghil-env-add! e v) v))
;;; sym))
;;; (vals (map-parse init e))
;;; (body (parse-body body e)))
;;; (for-each (lambda (v) (ghil-env-remove! e v)) vars)
;;; (<ghil-bind> e vars vals body)))))
;;;
;;; ;; (@lambda FORMALS BODY...)
;;; ((@lambda)
;;; (match args
;;; ((formals . body)
;;; (receive (syms rest) (parse-formals formals)
;;; (let* ((e (make-ghil-env e))
;;; (vars (map (lambda (s)
;;; (let ((v (make-ghil-var e s 'argument)))
;;; (ghil-env-add! e v) v))
;;; syms)))
;;; (<ghil-lambda> e vars rest (parse-body body e)))))))
;;;
;;; ;; (@eval-case CLAUSE...)
;;; ((@eval-case)
;;; (let loop ((clauses args))
;;; (cond ((null? clauses) (<ghil-void>))
;;; ((or (eq? (caar clauses) '@else)
;;; (and (memq 'load-toplevel (caar clauses))
;;; (ghil-env-toplevel? e)))
;;; (parse-body (cdar clauses) e))
;;; (else
;;; (loop (cdr clauses))))))
;;;
;;; (else (error "Unknown primitive:" prim))))
;;;
;;; (define (parse-body x e)
;;; (<ghil-begin> (map-parse x e)))
;;;
;;; (define (parse-formals formals)
;;; (cond
;;; ;; (@lambda x ...)
;;; ((symbol? formals) (values (list formals) #t))
;;; ;; (@lambda (x y z) ...)
;;; ((list? formals) (values formals #f))
;;; ;; (@lambda (x y . z) ...)
;;; ((pair? formals)
;;; (let loop ((l formals) (v '()))
;;; (if (pair? l)
;;; (loop (cdr l) (cons (car l) v))
;;; (values (reverse! (cons l v)) #t))))
;;; (else (error "Invalid formals:" formals))))
;;;
;;; (define (identifier-split identifier)
;;; (let ((m (string-match "::([^:]*)$" (symbol->string identifier))))
;;; (if m
;;; (values (string->symbol (match:prefix m))
;;; (string->symbol (match:substring m 1)))
;;; (values #f identifier))))
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