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+;;; Continuation-passing style (CPS) intermediate language (IL)
+
+;; Copyright (C) 2013, 2014, 2015, 2017, 2018 Free Software Foundation, Inc.
+
+;;;; This library is free software; you can redistribute it and/or
+;;;; modify it under the terms of the GNU Lesser General Public
+;;;; License as published by the Free Software Foundation; either
+;;;; version 3 of the License, or (at your option) any later version.
+;;;;
+;;;; This library 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
+;;;; Lesser General Public License for more details.
+;;;;
+;;;; You should have received a copy of the GNU Lesser General Public
+;;;; License along with this library; if not, write to the Free Software
+;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+;;; Commentary:
+;;;
+;;; Compiling CPS to bytecode. The result is in the bytecode language,
+;;; which happens to be an ELF image as a bytecode.
+;;;
+;;; Code:
+
+(define-module (language cps compile-bytecode)
+ #:use-module (ice-9 match)
+ #:use-module (srfi srfi-1)
+ #:use-module (language cps)
+ #:use-module (language cps slot-allocation)
+ #:use-module (language cps utils)
+ #:use-module (language cps closure-conversion)
+ #:use-module (language cps loop-instrumentation)
+ #:use-module (language cps optimize)
+ #:use-module (language cps reify-primitives)
+ #:use-module (language cps renumber)
+ #:use-module (language cps split-rec)
+ #:use-module (language cps intmap)
+ #:use-module (language cps intset)
+ #:use-module (system vm assembler)
+ #:use-module (system base types internal)
+ #:export (compile-bytecode))
+
+(define (kw-arg-ref args kw default)
+ (match (memq kw args)
+ ((_ val . _) val)
+ (_ default)))
+
+(define (intmap-for-each f map)
+ (intmap-fold (lambda (k v seed) (f k v) seed) map *unspecified*))
+
+(define (intmap-select map set)
+ (persistent-intmap
+ (intset-fold
+ (lambda (k out)
+ (intmap-add! out k (intmap-ref map k)))
+ set
+ empty-intmap)))
+
+;; Any $values expression that continues to a $kargs and causes no
+;; shuffles is a forwarding label.
+(define (compute-forwarding-labels cps allocation)
+ (fixpoint
+ (lambda (forwarding-map)
+ (intmap-fold (lambda (label target forwarding-map)
+ (let ((new-target (intmap-ref forwarding-map target
+ (lambda (target) target))))
+ (if (eqv? target new-target)
+ forwarding-map
+ (intmap-replace forwarding-map label new-target))))
+ forwarding-map forwarding-map))
+ (intmap-fold (lambda (label cont forwarding-labels)
+ (match cont
+ (($ $kargs _ _ ($ $continue k _ ($ $values)))
+ (match (lookup-parallel-moves label allocation)
+ (()
+ (match (intmap-ref cps k)
+ (($ $ktail) forwarding-labels)
+ (_ (intmap-add forwarding-labels label k))))
+ (_ forwarding-labels)))
+ (_ forwarding-labels)))
+ cps empty-intmap)))
+
+(define (compile-function cps asm opts)
+ (let* ((allocation (allocate-slots cps #:precolor-calls?
+ (kw-arg-ref opts #:precolor-calls? #t)))
+ (forwarding-labels (compute-forwarding-labels cps allocation))
+ (frame-size (lookup-nlocals allocation)))
+ (define (forward-label k)
+ (intmap-ref forwarding-labels k (lambda (k) k)))
+
+ (define (elide-cont? label)
+ (match (intmap-ref forwarding-labels label (lambda (_) #f))
+ (#f #f)
+ (target (not (eqv? label target)))))
+
+ (define (maybe-slot sym)
+ (lookup-maybe-slot sym allocation))
+
+ (define (slot sym)
+ (lookup-slot sym allocation))
+
+ (define (from-sp var)
+ (- frame-size 1 var))
+
+ (define (maybe-mov dst src)
+ (unless (= dst src)
+ (emit-mov asm (from-sp dst) (from-sp src))))
+
+ (define (compile-tail label exp)
+ ;; There are only three kinds of expressions in tail position:
+ ;; tail calls, multiple-value returns, and single-value returns.
+ (define (maybe-reset-frame nlocals)
+ (unless (= frame-size nlocals)
+ (emit-reset-frame asm nlocals)))
+ (match exp
+ (($ $call proc args)
+ (for-each (match-lambda
+ ((src . dst) (emit-mov asm (from-sp dst) (from-sp src))))
+ (lookup-parallel-moves label allocation))
+ (maybe-reset-frame (1+ (length args)))
+ (emit-handle-interrupts asm)
+ (emit-tail-call asm))
+ (($ $callk k proc args)
+ (for-each (match-lambda
+ ((src . dst) (emit-mov asm (from-sp dst) (from-sp src))))
+ (lookup-parallel-moves label allocation))
+ (maybe-reset-frame (1+ (length args)))
+ (emit-handle-interrupts asm)
+ (emit-tail-call-label asm k))
+ (($ $values args)
+ (for-each (match-lambda
+ ((src . dst) (emit-mov asm (from-sp dst) (from-sp src))))
+ (lookup-parallel-moves label allocation))
+ (maybe-reset-frame (length args))
+ (emit-handle-interrupts asm)
+ (emit-return-values asm))))
+
+ (define (compile-value label exp dst)
+ (match exp
+ (($ $values (arg))
+ (maybe-mov dst (slot arg)))
+ (($ $primcall (or 's64->u64 'u64->s64) #f (arg))
+ (maybe-mov dst (slot arg)))
+ (($ $const exp)
+ (emit-load-constant asm (from-sp dst) exp))
+ (($ $const-fun k)
+ (emit-load-static-procedure asm (from-sp dst) k))
+ (($ $code k)
+ (emit-load-label asm (from-sp dst) k))
+ (($ $primcall 'current-module)
+ (emit-current-module asm (from-sp dst)))
+ (($ $primcall 'current-thread)
+ (emit-current-thread asm (from-sp dst)))
+ (($ $primcall 'define! #f (mod sym))
+ (emit-define! asm (from-sp dst)
+ (from-sp (slot mod)) (from-sp (slot sym))))
+ (($ $primcall 'resolve (bound?) (name))
+ (emit-resolve asm (from-sp dst) bound? (from-sp (slot name))))
+ (($ $primcall 'allocate-words annotation (nfields))
+ (emit-allocate-words asm (from-sp dst) (from-sp (slot nfields))))
+ (($ $primcall 'allocate-words/immediate (annotation . nfields))
+ (emit-allocate-words/immediate asm (from-sp dst) nfields))
+ (($ $primcall 'scm-ref annotation (obj idx))
+ (emit-scm-ref asm (from-sp dst) (from-sp (slot obj))
+ (from-sp (slot idx))))
+ (($ $primcall 'scm-ref/tag annotation (obj))
+ (let ((tag (match annotation
+ ('pair %tc1-pair)
+ ('struct %tc3-struct))))
+ (emit-scm-ref/tag asm (from-sp dst) (from-sp (slot obj)) tag)))
+ (($ $primcall 'scm-ref/immediate (annotation . idx) (obj))
+ (emit-scm-ref/immediate asm (from-sp dst) (from-sp (slot obj)) idx))
+ (($ $primcall 'word-ref annotation (obj idx))
+ (emit-word-ref asm (from-sp dst) (from-sp (slot obj))
+ (from-sp (slot idx))))
+ (($ $primcall 'word-ref/immediate (annotation . idx) (obj))
+ (emit-word-ref/immediate asm (from-sp dst) (from-sp (slot obj)) idx))
+ (($ $primcall 'pointer-ref/immediate (annotation . idx) (obj))
+ (emit-pointer-ref/immediate asm (from-sp dst) (from-sp (slot obj)) idx))
+ (($ $primcall 'tail-pointer-ref/immediate (annotation . idx) (obj))
+ (emit-tail-pointer-ref/immediate asm (from-sp dst) (from-sp (slot obj))
+ idx))
+ (($ $primcall 'cache-ref key ())
+ (emit-cache-ref asm (from-sp dst) key))
+ (($ $primcall 'resolve-module public? (name))
+ (emit-resolve-module asm (from-sp dst) (from-sp (slot name)) public?))
+ (($ $primcall 'lookup #f (mod name))
+ (emit-lookup asm (from-sp dst) (from-sp (slot mod)) (from-sp (slot name))))
+ (($ $primcall 'add/immediate y (x))
+ (emit-add/immediate asm (from-sp dst) (from-sp (slot x)) y))
+ (($ $primcall 'sub/immediate y (x))
+ (emit-sub/immediate asm (from-sp dst) (from-sp (slot x)) y))
+ (($ $primcall 'uadd/immediate y (x))
+ (emit-uadd/immediate asm (from-sp dst) (from-sp (slot x)) y))
+ (($ $primcall 'usub/immediate y (x))
+ (emit-usub/immediate asm (from-sp dst) (from-sp (slot x)) y))
+ (($ $primcall 'umul/immediate y (x))
+ (emit-umul/immediate asm (from-sp dst) (from-sp (slot x)) y))
+ (($ $primcall 'rsh (x y))
+ (emit-rsh asm (from-sp dst) (from-sp (slot x)) (from-sp (slot y))))
+ (($ $primcall 'lsh (x y))
+ (emit-lsh asm (from-sp dst) (from-sp (slot x)) (from-sp (slot y))))
+ (($ $primcall 'rsh/immediate y (x))
+ (emit-rsh/immediate asm (from-sp dst) (from-sp (slot x)) y))
+ (($ $primcall 'lsh/immediate y (x))
+ (emit-lsh/immediate asm (from-sp dst) (from-sp (slot x)) y))
+ (($ $primcall 'ursh/immediate y (x))
+ (emit-ursh/immediate asm (from-sp dst) (from-sp (slot x)) y))
+ (($ $primcall 'srsh/immediate y (x))
+ (emit-srsh/immediate asm (from-sp dst) (from-sp (slot x)) y))
+ (($ $primcall 'ulsh/immediate y (x))
+ (emit-ulsh/immediate asm (from-sp dst) (from-sp (slot x)) y))
+ (($ $primcall 'builtin-ref idx ())
+ (emit-builtin-ref asm (from-sp dst) idx))
+ (($ $primcall 'scm->f64 #f (src))
+ (emit-scm->f64 asm (from-sp dst) (from-sp (slot src))))
+ (($ $primcall 'load-f64 val ())
+ (emit-load-f64 asm (from-sp dst) val))
+ (($ $primcall 'scm->u64 #f (src))
+ (emit-scm->u64 asm (from-sp dst) (from-sp (slot src))))
+ (($ $primcall 'scm->u64/truncate #f (src))
+ (emit-scm->u64/truncate asm (from-sp dst) (from-sp (slot src))))
+ (($ $primcall 'load-u64 val ())
+ (emit-load-u64 asm (from-sp dst) val))
+ (($ $primcall 'u64->scm #f (src))
+ (emit-u64->scm asm (from-sp dst) (from-sp (slot src))))
+ (($ $primcall 'scm->s64 #f (src))
+ (emit-scm->s64 asm (from-sp dst) (from-sp (slot src))))
+ (($ $primcall 'load-s64 val ())
+ (emit-load-s64 asm (from-sp dst) val))
+ (($ $primcall 's64->scm #f (src))
+ (emit-s64->scm asm (from-sp dst) (from-sp (slot src))))
+
+ (($ $primcall 'u8-ref ann (obj ptr idx))
+ (emit-u8-ref asm (from-sp dst) (from-sp (slot ptr))
+ (from-sp (slot idx))))
+ (($ $primcall 's8-ref ann (obj ptr idx))
+ (emit-s8-ref asm (from-sp dst) (from-sp (slot ptr))
+ (from-sp (slot idx))))
+ (($ $primcall 'u16-ref ann (obj ptr idx))
+ (emit-u16-ref asm (from-sp dst) (from-sp (slot ptr))
+ (from-sp (slot idx))))
+ (($ $primcall 's16-ref ann (obj ptr idx))
+ (emit-s16-ref asm (from-sp dst) (from-sp (slot ptr))
+ (from-sp (slot idx))))
+ (($ $primcall 'u32-ref ann (obj ptr idx))
+ (emit-u32-ref asm (from-sp dst) (from-sp (slot ptr))
+ (from-sp (slot idx))))
+ (($ $primcall 's32-ref ann (obj ptr idx))
+ (emit-s32-ref asm (from-sp dst) (from-sp (slot ptr))
+ (from-sp (slot idx))))
+ (($ $primcall 'u64-ref ann (obj ptr idx))
+ (emit-u64-ref asm (from-sp dst) (from-sp (slot ptr))
+ (from-sp (slot idx))))
+ (($ $primcall 's64-ref ann (obj ptr idx))
+ (emit-s64-ref asm (from-sp dst) (from-sp (slot ptr))
+ (from-sp (slot idx))))
+ (($ $primcall 'f32-ref ann (obj ptr idx))
+ (emit-f32-ref asm (from-sp dst) (from-sp (slot ptr))
+ (from-sp (slot idx))))
+ (($ $primcall 'f64-ref ann (obj ptr idx))
+ (emit-f64-ref asm (from-sp dst) (from-sp (slot ptr))
+ (from-sp (slot idx))))
+
+ (($ $primcall 'atomic-scm-ref/immediate (annotation . idx) (obj))
+ (emit-atomic-scm-ref/immediate asm (from-sp dst) (from-sp (slot obj))
+ idx))
+ (($ $primcall 'atomic-scm-swap!/immediate (annotation . idx) (obj val))
+ (emit-atomic-scm-swap!/immediate asm (from-sp dst) (from-sp (slot obj))
+ idx (from-sp (slot val))))
+ (($ $primcall 'atomic-scm-compare-and-swap!/immediate (annotation . idx)
+ (obj expected desired))
+ (emit-atomic-scm-compare-and-swap!/immediate
+ asm (from-sp dst) (from-sp (slot obj)) idx (from-sp (slot expected))
+ (from-sp (slot desired))))
+
+ (($ $primcall 'untag-fixnum #f (src))
+ (emit-untag-fixnum asm (from-sp dst) (from-sp (slot src))))
+ (($ $primcall 'tag-fixnum #f (src))
+ (emit-tag-fixnum asm (from-sp dst) (from-sp (slot src))))
+ (($ $primcall 'untag-char #f (src))
+ (emit-untag-char asm (from-sp dst) (from-sp (slot src))))
+ (($ $primcall 'tag-char #f (src))
+ (emit-tag-char asm (from-sp dst) (from-sp (slot src))))
+ (($ $primcall name #f args)
+ ;; FIXME: Inline all the cases.
+ (emit-text asm `((,name ,(from-sp dst)
+ ,@(map (compose from-sp slot) args)))))))
+
+ (define (compile-effect label exp k)
+ (match exp
+ (($ $values ()) #f)
+ (($ $primcall 'cache-set! key (val))
+ (emit-cache-set! asm key (from-sp (slot val))))
+ (($ $primcall 'scm-set! annotation (obj idx val))
+ (emit-scm-set! asm (from-sp (slot obj)) (from-sp (slot idx))
+ (from-sp (slot val))))
+ (($ $primcall 'scm-set!/tag annotation (obj val))
+ (let ((tag (match annotation
+ ('pair %tc1-pair)
+ ('struct %tc3-struct))))
+ (emit-scm-set!/tag asm (from-sp (slot obj)) tag
+ (from-sp (slot val)))))
+ (($ $primcall 'scm-set!/immediate (annotation . idx) (obj val))
+ (emit-scm-set!/immediate asm (from-sp (slot obj)) idx
+ (from-sp (slot val))))
+ (($ $primcall 'word-set! annotation (obj idx val))
+ (emit-word-set! asm (from-sp (slot obj)) (from-sp (slot idx))
+ (from-sp (slot val))))
+ (($ $primcall 'word-set!/immediate (annotation . idx) (obj val))
+ (emit-word-set!/immediate asm (from-sp (slot obj)) idx
+ (from-sp (slot val))))
+ (($ $primcall 'pointer-set!/immediate (annotation . idx) (obj val))
+ (emit-pointer-set!/immediate asm (from-sp (slot obj)) idx
+ (from-sp (slot val))))
+ (($ $primcall 'string-set! #f (string index char))
+ (emit-string-set! asm (from-sp (slot string)) (from-sp (slot index))
+ (from-sp (slot char))))
+ (($ $primcall 'push-fluid #f (fluid val))
+ (emit-push-fluid asm (from-sp (slot fluid)) (from-sp (slot val))))
+ (($ $primcall 'pop-fluid #f ())
+ (emit-pop-fluid asm))
+ (($ $primcall 'push-dynamic-state #f (state))
+ (emit-push-dynamic-state asm (from-sp (slot state))))
+ (($ $primcall 'pop-dynamic-state #f ())
+ (emit-pop-dynamic-state asm))
+ (($ $primcall 'wind #f (winder unwinder))
+ (emit-wind asm (from-sp (slot winder)) (from-sp (slot unwinder))))
+
+ (($ $primcall 'u8-set! ann (obj ptr idx val))
+ (emit-u8-set! asm (from-sp (slot ptr)) (from-sp (slot idx))
+ (from-sp (slot val))))
+ (($ $primcall 's8-set! ann (obj ptr idx val))
+ (emit-s8-set! asm (from-sp (slot ptr)) (from-sp (slot idx))
+ (from-sp (slot val))))
+ (($ $primcall 'u16-set! ann (obj ptr idx val))
+ (emit-u16-set! asm (from-sp (slot ptr)) (from-sp (slot idx))
+ (from-sp (slot val))))
+ (($ $primcall 's16-set! ann (obj ptr idx val))
+ (emit-s16-set! asm (from-sp (slot ptr)) (from-sp (slot idx))
+ (from-sp (slot val))))
+ (($ $primcall 'u32-set! ann (obj ptr idx val))
+ (emit-u32-set! asm (from-sp (slot ptr)) (from-sp (slot idx))
+ (from-sp (slot val))))
+ (($ $primcall 's32-set! ann (obj ptr idx val))
+ (emit-s32-set! asm (from-sp (slot ptr)) (from-sp (slot idx))
+ (from-sp (slot val))))
+ (($ $primcall 'u64-set! ann (obj ptr idx val))
+ (emit-u64-set! asm (from-sp (slot ptr)) (from-sp (slot idx))
+ (from-sp (slot val))))
+ (($ $primcall 's64-set! ann (obj ptr idx val))
+ (emit-s64-set! asm (from-sp (slot ptr)) (from-sp (slot idx))
+ (from-sp (slot val))))
+ (($ $primcall 'f32-set! ann (obj ptr idx val))
+ (emit-f32-set! asm (from-sp (slot ptr)) (from-sp (slot idx))
+ (from-sp (slot val))))
+ (($ $primcall 'f64-set! ann (obj ptr idx val))
+ (emit-f64-set! asm (from-sp (slot ptr)) (from-sp (slot idx))
+ (from-sp (slot val))))
+
+ (($ $primcall 'unwind #f ())
+ (emit-unwind asm))
+ (($ $primcall 'fluid-set! #f (fluid value))
+ (emit-fluid-set! asm (from-sp (slot fluid)) (from-sp (slot value))))
+ (($ $primcall 'atomic-scm-set!/immediate (annotation . idx) (obj val))
+ (emit-atomic-scm-set!/immediate asm (from-sp (slot obj)) idx
+ (from-sp (slot val))))
+ (($ $primcall 'instrument-loop #f ())
+ (emit-instrument-loop asm)
+ (emit-handle-interrupts asm))))
+
+ (define (compile-throw op param args)
+ (match (vector op param args)
+ (#('throw #f (key args))
+ (emit-throw asm (from-sp (slot key)) (from-sp (slot args))))
+ (#('throw/value param (val))
+ (emit-throw/value asm (from-sp (slot val)) param))
+ (#('throw/value+data param (val))
+ (emit-throw/value+data asm (from-sp (slot val)) param))))
+
+ (define (compile-prompt label k kh escape? tag)
+ (match (intmap-ref cps kh)
+ (($ $kreceive ($ $arity req () rest () #f) khandler-body)
+ (let ((receive-args (gensym "handler"))
+ (nreq (length req))
+ (proc-slot (lookup-call-proc-slot label allocation)))
+ (emit-prompt asm (from-sp (slot tag)) escape? proc-slot
+ receive-args)
+ (emit-j asm k)
+ (emit-label asm receive-args)
+ (unless (and rest (zero? nreq))
+ (emit-receive-values asm proc-slot (->bool rest) nreq))
+ (when (and rest
+ (match (intmap-ref cps khandler-body)
+ (($ $kargs names (_ ... rest))
+ (maybe-slot rest))))
+ (emit-bind-rest asm (+ proc-slot nreq)))
+ (for-each (match-lambda
+ ((src . dst) (emit-fmov asm dst src)))
+ (lookup-parallel-moves kh allocation))
+ (emit-reset-frame asm frame-size)
+ (emit-j asm (forward-label khandler-body))))))
+
+ (define (compile-values label exp syms)
+ (match exp
+ (($ $values args)
+ (for-each (match-lambda
+ ((src . dst) (emit-mov asm (from-sp dst) (from-sp src))))
+ (lookup-parallel-moves label allocation)))))
+
+ (define (compile-test label next-label kf kt op param args)
+ (define (prefer-true?)
+ (if (< (max kt kf) label)
+ ;; Two backwards branches. Prefer
+ ;; the nearest.
+ (> kt kf)
+ ;; Otherwise prefer a backwards
+ ;; branch or a near jump.
+ (< kt kf)))
+ (define (emit-branch emit-jt emit-jf)
+ (cond
+ ((eq? kt next-label)
+ (emit-jf asm kf))
+ ((eq? kf next-label)
+ (emit-jt asm kt))
+ ((prefer-true?)
+ (emit-jt asm kt)
+ (emit-j asm kf))
+ (else
+ (emit-jf asm kf)
+ (emit-j asm kt))))
+ (define (unary op a)
+ (op asm (from-sp (slot a)))
+ (emit-branch emit-je emit-jne))
+ (define (binary op emit-jt emit-jf a b)
+ (op asm (from-sp (slot a)) (from-sp (slot b)))
+ (emit-branch emit-jt emit-jf))
+ (define (binary-test op a b)
+ (binary op emit-je emit-jne a b))
+ (define (binary-< emit-<? a b)
+ (binary emit-<? emit-jl emit-jnl a b))
+ (define (binary-<= emit-<? a b)
+ (binary emit-<? emit-jge emit-jnge b a))
+ (define (binary-test/imm op a b)
+ (op asm (from-sp (slot a)) b)
+ (emit-branch emit-je emit-jne))
+ (define (binary-</imm op a b)
+ (op asm (from-sp (slot a)) b)
+ (emit-branch emit-jl emit-jnl))
+ (match (vector op param args)
+ ;; Immediate type tag predicates.
+ (#('fixnum? #f (a)) (unary emit-fixnum? a))
+ (#('heap-object? #f (a)) (unary emit-heap-object? a))
+ (#('char? #f (a)) (unary emit-char? a))
+ (#('eq-false? #f (a)) (unary emit-eq-false? a))
+ (#('eq-nil? #f (a)) (unary emit-eq-nil? a))
+ (#('eq-null? #f (a)) (unary emit-eq-null? a))
+ (#('eq-true? #f (a)) (unary emit-eq-true? a))
+ (#('unspecified? #f (a)) (unary emit-unspecified? a))
+ (#('undefined? #f (a)) (unary emit-undefined? a))
+ (#('eof-object? #f (a)) (unary emit-eof-object? a))
+ (#('null? #f (a)) (unary emit-null? a))
+ (#('false? #f (a)) (unary emit-false? a))
+ (#('nil? #f (a)) (unary emit-nil? a))
+ ;; Heap type tag predicates.
+ (#('pair? #f (a)) (unary emit-pair? a))
+ (#('struct? #f (a)) (unary emit-struct? a))
+ (#('symbol? #f (a)) (unary emit-symbol? a))
+ (#('variable? #f (a)) (unary emit-variable? a))
+ (#('vector? #f (a)) (unary emit-vector? a))
+ (#('mutable-vector? #f (a)) (unary emit-mutable-vector? a))
+ (#('immutable-vector? #f (a)) (unary emit-immutable-vector? a))
+ (#('string? #f (a)) (unary emit-string? a))
+ (#('heap-number? #f (a)) (unary emit-heap-number? a))
+ (#('hash-table? #f (a)) (unary emit-hash-table? a))
+ (#('pointer? #f (a)) (unary emit-pointer? a))
+ (#('fluid? #f (a)) (unary emit-fluid? a))
+ (#('stringbuf? #f (a)) (unary emit-stringbuf? a))
+ (#('dynamic-state? #f (a)) (unary emit-dynamic-state? a))
+ (#('frame? #f (a)) (unary emit-frame? a))
+ (#('keyword? #f (a)) (unary emit-keyword? a))
+ (#('atomic-box? #f (a)) (unary emit-atomic-box? a))
+ (#('syntax? #f (a)) (unary emit-syntax? a))
+ (#('program? #f (a)) (unary emit-program? a))
+ (#('vm-continuation? #f (a)) (unary emit-vm-continuation? a))
+ (#('bytevector? #f (a)) (unary emit-bytevector? a))
+ (#('weak-set? #f (a)) (unary emit-weak-set? a))
+ (#('weak-table? #f (a)) (unary emit-weak-table? a))
+ (#('array? #f (a)) (unary emit-array? a))
+ (#('bitvector? #f (a)) (unary emit-bitvector? a))
+ (#('smob? #f (a)) (unary emit-smob? a))
+ (#('port? #f (a)) (unary emit-port? a))
+ (#('bignum? #f (a)) (unary emit-bignum? a))
+ (#('flonum? #f (a)) (unary emit-flonum? a))
+ (#('compnum? #f (a)) (unary emit-compnum? a))
+ (#('fracnum? #f (a)) (unary emit-fracnum? a))
+ ;; Binary predicates.
+ (#('eq? #f (a b)) (binary-test emit-eq? a b))
+ (#('heap-numbers-equal? #f (a b))
+ (binary-test emit-heap-numbers-equal? a b))
+ (#('< #f (a b)) (binary-< emit-<? a b))
+ (#('<= #f (a b)) (binary-<= emit-<? a b))
+ (#('= #f (a b)) (binary-test emit-=? a b))
+ (#('u64-< #f (a b)) (binary-< emit-u64<? a b))
+ (#('u64-imm-< b (a)) (binary-</imm emit-u64-imm<? a b))
+ (#('imm-u64-< b (a)) (binary-</imm emit-imm-u64<? a b))
+ (#('u64-= #f (a b)) (binary-test emit-u64=? a b))
+ (#('u64-imm-= b (a)) (binary-test/imm emit-s64-imm=? a b))
+ (#('s64-= #f (a b)) (binary-test emit-u64=? a b))
+ (#('s64-imm-= b (a)) (binary-test/imm emit-s64-imm=? a b))
+ (#('s64-< #f (a b)) (binary-< emit-s64<? a b))
+ (#('s64-imm-< b (a)) (binary-</imm emit-s64-imm<? a b))
+ (#('imm-s64-< b (a)) (binary-</imm emit-imm-s64<? a b))
+ (#('f64-< #f (a b)) (binary-< emit-f64<? a b))
+ (#('f64-<= #f (a b)) (binary-<= emit-f64<? a b))
+ (#('f64-= #f (a b)) (binary-test emit-f64=? a b))))
+
+ (define (compile-trunc label k exp nreq rest-var)
+ (define (do-call proc args emit-call)
+ (let* ((proc-slot (lookup-call-proc-slot label allocation))
+ (nargs (1+ (length args)))
+ (arg-slots (map (lambda (x) (+ x proc-slot)) (iota nargs))))
+ (for-each (match-lambda
+ ((src . dst) (emit-mov asm (from-sp dst) (from-sp src))))
+ (lookup-parallel-moves label allocation))
+ (emit-handle-interrupts asm)
+ (emit-call asm proc-slot nargs)
+ (emit-slot-map asm proc-slot (lookup-slot-map label allocation))
+ (cond
+ ((and (= 1 nreq) (and rest-var) (not (maybe-slot rest-var))
+ (match (lookup-parallel-moves k allocation)
+ ((((? (lambda (src) (= src proc-slot)) src)
+ . dst)) dst)
+ (_ #f)))
+ ;; The usual case: one required live return value, ignoring
+ ;; any additional values.
+ => (lambda (dst)
+ (emit-receive asm dst proc-slot frame-size)))
+ (else
+ (unless (and (zero? nreq) rest-var)
+ (emit-receive-values asm proc-slot (->bool rest-var) nreq))
+ (when (and rest-var (maybe-slot rest-var))
+ (emit-bind-rest asm (+ proc-slot nreq)))
+ (for-each (match-lambda
+ ((src . dst) (emit-fmov asm dst src)))
+ (lookup-parallel-moves k allocation))
+ (emit-reset-frame asm frame-size)))))
+ (match exp
+ (($ $call proc args)
+ (do-call proc args
+ (lambda (asm proc-slot nargs)
+ (emit-call asm proc-slot nargs))))
+ (($ $callk k proc args)
+ (do-call proc args
+ (lambda (asm proc-slot nargs)
+ (emit-call-label asm proc-slot nargs k))))))
+
+ (define (skip-elided-conts label)
+ (if (elide-cont? label)
+ (skip-elided-conts (1+ label))
+ label))
+
+ (define (compile-expression label k exp)
+ (let* ((forwarded-k (forward-label k))
+ (fallthrough? (= forwarded-k (skip-elided-conts (1+ label)))))
+ (define (maybe-emit-jump)
+ (unless fallthrough?
+ (emit-j asm forwarded-k)))
+ (match (intmap-ref cps k)
+ (($ $ktail)
+ (compile-tail label exp))
+ (($ $kargs (name) (sym))
+ (let ((dst (maybe-slot sym)))
+ (when dst
+ (compile-value label exp dst)))
+ (maybe-emit-jump))
+ (($ $kargs () ())
+ (compile-effect label exp k)
+ (maybe-emit-jump))
+ (($ $kargs names syms)
+ (compile-values label exp syms)
+ (maybe-emit-jump))
+ (($ $kreceive ($ $arity req () rest () #f) kargs)
+ (compile-trunc label k exp (length req)
+ (and rest
+ (match (intmap-ref cps kargs)
+ (($ $kargs names (_ ... rest)) rest))))
+ (let* ((kargs (forward-label kargs))
+ (fallthrough? (and fallthrough?
+ (= kargs (skip-elided-conts (1+ k))))))
+ (unless fallthrough?
+ (emit-j asm kargs)))))))
+
+ (define (compile-term label term)
+ (match term
+ (($ $continue k src exp)
+ (when src
+ (emit-source asm src))
+ (unless (elide-cont? label)
+ (compile-expression label k exp)))
+ (($ $branch kf kt src op param args)
+ (when src
+ (emit-source asm src))
+ (compile-test label (skip-elided-conts (1+ label))
+ (forward-label kf) (forward-label kt)
+ op param args))
+ (($ $prompt k kh src escape? tag)
+ (when src
+ (emit-source asm src))
+ (compile-prompt label (skip-elided-conts k) kh escape? tag))
+ (($ $throw src op param args)
+ (when src
+ (emit-source asm src))
+ (compile-throw op param args))))
+
+ (define (compile-cont label cont)
+ (match cont
+ (($ $kfun src meta self tail clause)
+ (when src
+ (emit-source asm src))
+ (emit-begin-program asm label meta))
+ (($ $kclause ($ $arity req opt rest kw allow-other-keys?) body alt)
+ (let ((first? (match (intmap-ref cps (1- label))
+ (($ $kfun) #t)
+ (_ #f)))
+ (kw-indices (map (match-lambda
+ ((key name sym)
+ (cons key (lookup-slot sym allocation))))
+ kw)))
+ (unless first?
+ (emit-end-arity asm))
+ (emit-label asm label)
+ (emit-begin-kw-arity asm req opt rest kw-indices allow-other-keys?
+ frame-size alt)
+ ;; All arities define a closure binding in slot 0.
+ (emit-definition asm 'closure 0 'scm)
+ ;; Usually we just fall through, but it could be the body is
+ ;; contified into another clause.
+ (let ((body (forward-label body)))
+ (unless (= body (skip-elided-conts (1+ label)))
+ (emit-j asm body)))))
+ (($ $kargs names vars term)
+ (emit-label asm label)
+ (for-each (lambda (name var)
+ (let ((slot (maybe-slot var)))
+ (when slot
+ (let ((repr (lookup-representation var allocation)))
+ (emit-definition asm name slot repr)))))
+ names vars)
+ (compile-term label term))
+ (($ $kreceive arity kargs)
+ (emit-label asm label))
+ (($ $ktail)
+ (emit-end-arity asm)
+ (emit-end-program asm))))
+
+ (intmap-for-each compile-cont cps)))
+
+(define (emit-bytecode exp env opts)
+ (let ((asm (make-assembler)))
+ (intmap-for-each (lambda (kfun body)
+ (compile-function (intmap-select exp body) asm opts))
+ (compute-reachable-functions exp 0))
+ (values (link-assembly asm #:page-aligned? (kw-arg-ref opts #:to-file? #f))
+ env
+ env)))
+
+(define (lower-cps exp opts)
+ ;; FIXME: For now the closure conversion pass relies on $rec instances
+ ;; being separated into SCCs. We should fix this to not be the case,
+ ;; and instead move the split-rec pass back to
+ ;; optimize-higher-order-cps.
+ (set! exp (split-rec exp))
+ (set! exp (optimize-higher-order-cps exp opts))
+ (set! exp (convert-closures exp))
+ (set! exp (optimize-first-order-cps exp opts))
+ (set! exp (reify-primitives exp))
+ (set! exp (add-loop-instrumentation exp))
+ (renumber exp))
+
+(define (compile-bytecode exp env opts)
+ (set! exp (lower-cps exp opts))
+ (emit-bytecode exp env opts))