[bpt/guile.git] / module / system / vm / assemble.scm

;;; Guile VM assembler

;; 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 vm assemble)
  :use-syntax (system base syntax)
  :use-module (system il glil)
  :use-module (system vm core)
  :use-module (system vm conv)
  :use-module (ice-9 match)
  :use-module (ice-9 regex)
  :use-module (ice-9 common-list)
  :export (assemble))

(define (assemble glil env . opts)
  (dump (codegen (preprocess glil #f) #t)))

\f
;;;
;;; Types
;;;

(define-structure (<vm-asm> venv glil body))
(define-structure (venv parent nexts closure?))
(define-structure (vmod id))
(define-structure (vlink module name))
(define-structure (bytespec nargs nrest nlocs bytes objs))

\f
;;;
;;; Stage 1: Preprocess
;;;

(define (preprocess x e)
  (match x
    (($ <glil-asm> nargs nrest nlocs nexts body)
     (let* ((venv (make-venv e nexts #f))
	    (body (map (lambda (x) (preprocess x venv)) body)))
       (make-<vm-asm> venv x body)))
    (($ <glil-external> op depth index)
     (do ((d depth (1- d))
	  (e e (venv-parent e)))
	 ((= d 0))
       (set-venv-closure?! e #t))
     x)
    (else x)))

\f
;;;
;;; Stage 2: Bytecode generation
;;;

(define (codegen glil toplevel)
  (match glil
    (($ <vm-asm> venv ($ <glil-asm> nargs nrest nlocs nexts _) body)
     (let ((stack '())
	   (label-alist '())
	   (object-alist '())
	   (nvars (+ nargs nlocs -1)))
       (define (push-code! code)
	 (set! stack (optimizing-push code stack)))
       (define (push-object! x)
	 (let ((index (or ((if (vlink? x) assoc-ref assq-ref) object-alist x)
			  (let ((index (length object-alist)))
			    (set! object-alist (acons x index object-alist))
			    index))))
	   (push-code! `(object-ref ,index))))
       (define (label-ref key)
	 (assq-ref label-alist key))
       (define (label-set key)
	 (let ((addr (apply + (map length stack))))
	   (set! label-alist (assq-set! label-alist key addr))))
       (define (generate-code x)
	 (match x
	   (($ <vm-asm> env)
	    (push-object! (codegen x #f))
	    (if (venv-closure? env) (push-code! `(make-closure))))

	   (($ <glil-void>)
	    (push-code! `(void)))

	   (($ <glil-const> x)
	    (if toplevel
		(for-each push-code! (object->dump-code x))
		(cond ((object->code x) => push-code!)
		      (else (push-object! x)))))

	   (($ <glil-argument> op index)
	    (push-code! `(,(symbol-append 'local- op) ,(- nvars index))))

	   (($ <glil-local> op index)
	    (push-code! `(,(symbol-append 'local- op)
			  ,(- nvars (+ nargs index)))))

	   (($ <glil-external> op depth index)
	    (do ((e venv (venv-parent e))
		 (d depth (1- d))
		 (i 0 (+ i (venv-nexts e))))
		((= d 0)
		 (push-code! `(,(symbol-append 'external- op) ,(+ index i))))))

	   (($ <glil-module> op module name)
	    (if toplevel
		(begin
		  ;; (push-code! `(load-module ,module))
		  (for-each push-code! (object->dump-code name))
		  (push-code! `(link/current-module)))
		;; (let ((vlink (make-vlink (make-vmod module) name)))
		(push-object! (make-vlink #f name)))
	    (push-code! (list (symbol-append 'variable- op))))

	   (($ <glil-label> label)
	    (label-set label))

	   (($ <glil-branch> inst label)
	    (let ((setter (lambda (addr) (- (label-ref label) addr))))
	      (push-code! (list inst setter))))

	   (($ <glil-call> inst nargs)
	    (if (instruction? inst)
		(let ((pops (instruction-pops inst)))
		  (cond ((< pops 0)
			 (push-code! (list inst nargs)))
			((= pops nargs)
			 (push-code! (list inst)))
			(else
			 (error "Wrong number of arguments:" inst nargs))))
		(error "Unknown instruction:" inst)))))
       ;;
       ;; main
       (if (> nexts 0) (push-code! `(external ,nexts)))
       (for-each generate-code body)
       (let ((bytes (apply string-append (stack-finalize (reverse! stack))))
	     (objs (map car (reverse! object-alist))))
	 (make-bytespec nargs nrest nlocs bytes objs))))))

(define (stack-finalize stack)
  (let loop ((list '()) (stack stack) (addr 0))
    (if (null? stack)
	(reverse! list)
	(let* ((orig (car stack))
	       (addr (+ addr (length orig)))
	       (code (if (and (pair? (cdr orig)) (procedure? (cadr orig)))
			 `(,(car orig) ,((cadr orig) addr))
			 orig)))
	  (loop (cons (code->bytes code) list) (cdr stack) addr)))))

;; Optimization

(define *optimize-table*
  '((not       (not       . not-not)
	       (eq?       . not-eq?)
	       (null?     . not-null?)
	       (not-not   . not)
	       (not-eq?   . eq?)
	       (not-null? . null?))
    (br-if     (not       . br-if-not)
	       (eq?       . br-if-eq)
	       (null?     . br-if-null)
	       (not-not   . br-if)
	       (not-eq?   . br-if-not-eq)
	       (not-null? . br-if-not-null))
    (br-if-not (not       . br-if)
	       (eq?       . br-if-not-eq)
	       (null?     . br-if-not-null)
	       (not-not   . br-if-not)
	       (not-eq?   . br-if-eq)
	       (not-null? . br-if-null))))

(define (optimizing-push code stack)
  (let ((alist (assq-ref *optimize-table* (car code))))
    (cond ((and alist (pair? stack) (assq-ref alist (caar stack))) =>
	   (lambda (inst) (cons (cons inst (cdr code)) (cdr stack))))
	  (else (cons (code-pack code) stack)))))

\f
;;;
;;; Stage3: Dumpcode generation
;;;

(define (dump bytespec)
  (let* ((table (build-object-table bytespec))
	 (bytes (bytespec->bytecode bytespec table '(return))))
    (if (null? table)
	bytes
	(let ((spec (make-bytespec 0 0 (length table) bytes '())))
	  (bytespec->bytecode spec '() '(tail-call 0))))))

(define (bytespec->bytecode bytespec object-table last-code)
  (let ((stack '()))
    (define (push-code! x)
      (set! stack (cons x stack)))
    (define (object-index x)
      (cond ((object-find object-table x) => cdr)
	    (else #f)))
    (define (dump-table-object! obj+index)
      (let dump! ((x (car obj+index)))
	(cond
	 ((vlink? x)
	  ;; (push-code! `(local-ref ,(object-index (vlink-module x))))
	  (for-each push-code! (object->dump-code (vlink-name x)))
	  (push-code! `(link/current-module)))
	 ;;((vmod? x)
	 ;;  (push-code! `(load-module ,(vmod-id x))))
	 (else
	  (for-each push-code! (object->dump-code x)))))
      (push-code! `(local-set ,(cdr obj+index))))
    (define (dump-object! x)
      (let dump! ((x x))
	(cond
	 ((bytespec? x) (dump-bytecode! x))
	 ((object-index x) => (lambda (i) (push-code! `(local-ref ,i))))
	 (else
	  (error "Cannot dump:" x)))))
    (define (dump-bytecode! spec)
      (let ((nargs (bytespec-nargs spec))
	    (nrest (bytespec-nrest spec))
	    (nlocs (bytespec-nlocs spec))
	    (objs  (bytespec-objs spec)))
	;; dump parameters
	(if (and (< nargs 4) (< nlocs 16))
	    (push-code! (object->code (+ (* nargs 32) (* nrest 16) nlocs)))
	    (begin
	      (push-code! (object->code nargs))
	      (push-code! (object->code nrest))
	      (push-code! (object->code nlocs))
	      (push-code! (object->code #f))))
	;; dump object table
	(cond ((not (null? objs))
	       (for-each dump-object! objs)
	       (push-code! `(vector ,(length objs)))))
	;; dump bytecode
	(push-code! `(load-program ,(bytespec-bytes spec)))))
    ;;
    ;; main
    (for-each dump-table-object! object-table)
    (dump-bytecode! bytespec)
    (push-code! last-code)
    (apply string-append
	   (map code->bytes (map code-pack (reverse! stack))))))

(define (object-find table x)
  ((if (or (vlink? x) (vmod? x)) assoc assq) x table))

(define (build-object-table bytespec)
  (let ((table '()) (index 0))
    (define (insert! x)
      ;; (if (vlink? x) (begin (insert! (vlink-module x))))
      (if (not (object-find table x))
	  (begin
	    (set! table (acons x index table))
	    (set! index (1+ index)))))
    (let loop ((spec bytespec))
      (for-each (lambda (x)
		  (if (bytespec? x) (loop x) (insert! x)))
		(bytespec-objs spec)))
    (reverse! table)))
Commit	Line	Data
17e90c5e KN	1	;;; Guile VM assembler
	2
	3	;; Copyright (C) 2001 Free Software Foundation, Inc.
	4
	5	;; This program is free software; you can redistribute it and/or modify
	6	;; it under the terms of the GNU General Public License as published by
	7	;; the Free Software Foundation; either version 2, or (at your option)
	8	;; any later version.
	9	;;
	10	;; This program is distributed in the hope that it will be useful,
	11	;; but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	;; GNU General Public License for more details.
	14	;;
	15	;; You should have received a copy of the GNU General Public License
	16	;; along with this program; see the file COPYING. If not, write to
	17	;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	18	;; Boston, MA 02111-1307, USA.
	19
	20	;;; Code:
	21
	22	(define-module (system vm assemble)
	23	:use-syntax (system base syntax)
17e90c5e KN	24	:use-module (system il glil)
	25	:use-module (system vm core)
	26	:use-module (system vm conv)
	27	:use-module (ice-9 match)
	28	:use-module (ice-9 regex)
	29	:use-module (ice-9 common-list)
	30	:export (assemble))
	31
	32	(define (assemble glil env . opts)
	33	(dump (codegen (preprocess glil #f) #t)))
	34
	35	\f
	36	;;;
	37	;;; Types
	38	;;;
	39
	40	(define-structure (<vm-asm> venv glil body))
	41	(define-structure (venv parent nexts closure?))
	42	(define-structure (vmod id))
	43	(define-structure (vlink module name))
	44	(define-structure (bytespec nargs nrest nlocs bytes objs))
	45
	46	\f
	47	;;;
	48	;;; Stage 1: Preprocess
	49	;;;
	50
	51	(define (preprocess x e)
	52	(match x
	53	(($ <glil-asm> nargs nrest nlocs nexts body)
	54	(let* ((venv (make-venv e nexts #f))
	55	(body (map (lambda (x) (preprocess x venv)) body)))
	56	(make-<vm-asm> venv x body)))
	57	(($ <glil-external> op depth index)
	58	(do ((d depth (1- d))
	59	(e e (venv-parent e)))
	60	((= d 0))
	61	(set-venv-closure?! e #t))
	62	x)
	63	(else x)))
	64
	65	\f
	66	;;;
	67	;;; Stage 2: Bytecode generation
	68	;;;
	69
	70	(define (codegen glil toplevel)
	71	(match glil
	72	(($ <vm-asm> venv ($ <glil-asm> nargs nrest nlocs nexts _) body)
	73	(let ((stack '())
	74	(label-alist '())
	75	(object-alist '())
	76	(nvars (+ nargs nlocs -1)))
17e90c5e KN	77	(define (push-code! code)
17e90c5e KN	78	(set! stack (optimizing-push code stack)))
206a0622 KN	79	(define (push-object! x)
	80	(let ((index (or ((if (vlink? x) assoc-ref assq-ref) object-alist x)
	81	(let ((index (length object-alist)))
	82	(set! object-alist (acons x index object-alist))
	83	index))))
	84	(push-code! `(object-ref ,index))))
17e90c5e KN	85	(define (label-ref key)
17e90c5e KN	86	(assq-ref label-alist key))
206a0622 KN	87	(define (label-set key)
	88	(let ((addr (apply + (map length stack))))
	89	(set! label-alist (assq-set! label-alist key addr))))
17e90c5e KN	90	(define (generate-code x)
	91	(match x
	92	(($ <vm-asm> env)
206a0622	93	(push-object! (codegen x #f))
17e90c5e KN	94	(if (venv-closure? env) (push-code! `(make-closure))))
	95
	96	(($ <glil-void>)
	97	(push-code! `(void)))
	98
	99	(($ <glil-const> x)
	100	(if toplevel
	101	(for-each push-code! (object->dump-code x))
	102	(cond ((object->code x) => push-code!)
206a0622	103	(else (push-object! x)))))
17e90c5e KN	104
17e90c5e KN	105	(($ <glil-argument> op index)
206a0622	106	(push-code! `(,(symbol-append 'local- op) ,(- nvars index))))
17e90c5e KN	107
17e90c5e KN	108	(($ <glil-local> op index)
206a0622 KN	109	(push-code! `(,(symbol-append 'local- op)
206a0622 KN	110	,(- nvars (+ nargs index)))))
17e90c5e KN	111
	112	(($ <glil-external> op depth index)
	113	(do ((e venv (venv-parent e))
	114	(d depth (1- d))
	115	(i 0 (+ i (venv-nexts e))))
	116	((= d 0)
206a0622	117	(push-code! `(,(symbol-append 'external- op) ,(+ index i))))))
17e90c5e KN	118
17e90c5e KN	119	(($ <glil-module> op module name)
d4ae3ae6 KN	120	(if toplevel
	121	(begin
	122	;; (push-code! `(load-module ,module))
206a0622	123	(for-each push-code! (object->dump-code name))
d4ae3ae6 KN	124	(push-code! `(link/current-module)))
d4ae3ae6 KN	125	;; (let ((vlink (make-vlink (make-vmod module) name)))
206a0622	126	(push-object! (make-vlink #f name)))
d4ae3ae6	127	(push-code! (list (symbol-append 'variable- op))))
17e90c5e KN	128
17e90c5e KN	129	(($ <glil-label> label)
206a0622	130	(label-set label))
17e90c5e KN	131
17e90c5e KN	132	(($ <glil-branch> inst label)
206a0622	133	(let ((setter (lambda (addr) (- (label-ref label) addr))))
17e90c5e KN	134	(push-code! (list inst setter))))
17e90c5e KN	135
46cd9a34	136	(($ <glil-call> inst nargs)
17e90c5e	137	(if (instruction? inst)
46cd9a34 KN	138	(let ((pops (instruction-pops inst)))
	139	(cond ((< pops 0)
	140	(push-code! (list inst nargs)))
	141	((= pops nargs)
	142	(push-code! (list inst)))
	143	(else
	144	(error "Wrong number of arguments:" inst nargs))))
17e90c5e KN	145	(error "Unknown instruction:" inst)))))
	146	;;
	147	;; main
	148	(if (> nexts 0) (push-code! `(external ,nexts)))
	149	(for-each generate-code body)
206a0622	150	(let ((bytes (apply string-append (stack-finalize (reverse! stack))))
17e90c5e KN	151	(objs (map car (reverse! object-alist))))
	152	(make-bytespec nargs nrest nlocs bytes objs))))))
	153
206a0622 KN	154	(define (stack-finalize stack)
	155	(let loop ((list '()) (stack stack) (addr 0))
	156	(if (null? stack)
	157	(reverse! list)
	158	(let* ((orig (car stack))
	159	(addr (+ addr (length orig)))
	160	(code (if (and (pair? (cdr orig)) (procedure? (cadr orig)))
	161	`(,(car orig) ,((cadr orig) addr))
	162	orig)))
	163	(loop (cons (code->bytes code) list) (cdr stack) addr)))))
17e90c5e KN	164
	165	;; Optimization
	166
	167	(define optimize-table
	168	'((not (not . not-not)
	169	(eq? . not-eq?)
	170	(null? . not-null?)
	171	(not-not . not)
	172	(not-eq? . eq?)
	173	(not-null? . null?))
	174	(br-if (not . br-if-not)
	175	(eq? . br-if-eq)
	176	(null? . br-if-null)
	177	(not-not . br-if)
	178	(not-eq? . br-if-not-eq)
	179	(not-null? . br-if-not-null))
	180	(br-if-not (not . br-if)
	181	(eq? . br-if-not-eq)
	182	(null? . br-if-not-null)
	183	(not-not . br-if-not)
	184	(not-eq? . br-if-eq)
	185	(not-null? . br-if-null))))
	186
	187	(define (optimizing-push code stack)
	188	(let ((alist (assq-ref optimize-table (car code))))
206a0622 KN	189	(cond ((and alist (pair? stack) (assq-ref alist (caar stack))) =>
	190	(lambda (inst) (cons (cons inst (cdr code)) (cdr stack))))
	191	(else (cons (code-pack code) stack)))))
17e90c5e KN	192
	193	\f
	194	;;;
	195	;;; Stage3: Dumpcode generation
	196	;;;
	197
	198	(define (dump bytespec)
	199	(let* ((table (build-object-table bytespec))
	200	(bytes (bytespec->bytecode bytespec table '(return))))
	201	(if (null? table)
	202	bytes
	203	(let ((spec (make-bytespec 0 0 (length table) bytes '())))
	204	(bytespec->bytecode spec '() '(tail-call 0))))))
	205
	206	(define (bytespec->bytecode bytespec object-table last-code)
	207	(let ((stack '()))
	208	(define (push-code! x)
	209	(set! stack (cons x stack)))
	210	(define (object-index x)
	211	(cond ((object-find object-table x) => cdr)
	212	(else #f)))
	213	(define (dump-table-object! obj+index)
	214	(let dump! ((x (car obj+index)))
	215	(cond
	216	((vlink? x)
fdcedea6	217	;; (push-code! `(local-ref ,(object-index (vlink-module x))))
206a0622	218	(for-each push-code! (object->dump-code (vlink-name x)))
fdcedea6	219	(push-code! `(link/current-module)))
206a0622 KN	220	;;((vmod? x)
206a0622 KN	221	;; (push-code! `(load-module ,(vmod-id x))))
17e90c5e KN	222	(else
	223	(for-each push-code! (object->dump-code x)))))
	224	(push-code! `(local-set ,(cdr obj+index))))
	225	(define (dump-object! x)
	226	(let dump! ((x x))
	227	(cond
	228	((bytespec? x) (dump-bytecode! x))
	229	((object-index x) => (lambda (i) (push-code! `(local-ref ,i))))
	230	(else
	231	(error "Cannot dump:" x)))))
	232	(define (dump-bytecode! spec)
	233	(let ((nargs (bytespec-nargs spec))
	234	(nrest (bytespec-nrest spec))
	235	(nlocs (bytespec-nlocs spec))
	236	(objs (bytespec-objs spec)))
206a0622 KN	237	;; dump parameters
206a0622 KN	238	(if (and (< nargs 4) (< nlocs 16))
17e90c5e KN	239	(push-code! (object->code (+ (* nargs 32) (* nrest 16) nlocs)))
17e90c5e KN	240	(begin
17e90c5e KN	241	(push-code! (object->code nargs))
	242	(push-code! (object->code nrest))
	243	(push-code! (object->code nlocs))
206a0622 KN	244	(push-code! (object->code #f))))
	245	;; dump object table
	246	(cond ((not (null? objs))
	247	(for-each dump-object! objs)
	248	(push-code! `(vector ,(length objs)))))
17e90c5e KN	249	;; dump bytecode
	250	(push-code! `(load-program ,(bytespec-bytes spec)))))
	251	;;
	252	;; main
	253	(for-each dump-table-object! object-table)
	254	(dump-bytecode! bytespec)
	255	(push-code! last-code)
206a0622 KN	256	(apply string-append
206a0622 KN	257	(map code->bytes (map code-pack (reverse! stack))))))
17e90c5e KN	258
	259	(define (object-find table x)
	260	((if (or (vlink? x) (vmod? x)) assoc assq) x table))
	261
	262	(define (build-object-table bytespec)
	263	(let ((table '()) (index 0))
	264	(define (insert! x)
d4ae3ae6	265	;; (if (vlink? x) (begin (insert! (vlink-module x))))
17e90c5e KN	266	(if (not (object-find table x))
	267	(begin
	268	(set! table (acons x index table))
	269	(set! index (1+ index)))))
	270	(let loop ((spec bytespec))
	271	(for-each (lambda (x)
	272	(if (bytespec? x) (loop x) (insert! x)))
	273	(bytespec-objs spec)))
	274	(reverse! table)))