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ad55ee83c3
* module/language/cps.scm ($throw): New term type that doesn't have a continuation. Adapt all callers. Remove now-unneeded "prune-bailouts" pass.
432 lines
18 KiB
Scheme
432 lines
18 KiB
Scheme
;;; Continuation-passing style (CPS) intermediate language (IL)
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;; Copyright (C) 2013, 2014, 2015, 2017, 2018 Free Software Foundation, Inc.
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;;;; This library is free software; you can redistribute it and/or
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;;;; modify it under the terms of the GNU Lesser General Public
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;;;; License as published by the Free Software Foundation; either
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;;;; version 3 of the License, or (at your option) any later version.
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;;;;
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;;;; This library is distributed in the hope that it will be useful,
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;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;;;; Lesser General Public License for more details.
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;;;;
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;;;; You should have received a copy of the GNU Lesser General Public
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;;;; License along with this library; if not, write to the Free Software
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;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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;;; Commentary:
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;;;
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;;; A pass to reify lone $prim's that were never folded into a
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;;; $primcall, and $primcall's to primitives that don't have a
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;;; corresponding VM op.
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;;;
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;;; Code:
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(define-module (language cps reify-primitives)
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#:use-module (ice-9 match)
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#:use-module (language cps)
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#:use-module (language cps utils)
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#:use-module (language cps with-cps)
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#:use-module (language cps intmap)
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#:use-module (language bytecode)
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#:export (reify-primitives))
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(define (module-box cps src module name public? bound? val-proc)
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(with-cps cps
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(letv box)
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(let$ body (val-proc box))
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(letk kbox ($kargs ('box) (box) ,body))
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(build-term ($continue kbox src
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($primcall 'cached-module-box
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(list module name public? bound?) ())))))
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(define (primitive-module name)
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(case name
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((bytevector?
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bytevector-length
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bytevector-u8-ref bytevector-u8-set!
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bytevector-s8-ref bytevector-s8-set!
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bytevector-u16-ref bytevector-u16-set!
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bytevector-u16-native-ref bytevector-u16-native-set!
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bytevector-s16-ref bytevector-s16-set!
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bytevector-s16-native-ref bytevector-s16-native-set!
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bytevector-u32-ref bytevector-u32-set!
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bytevector-u32-native-ref bytevector-u32-native-set!
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bytevector-s32-ref bytevector-s32-set!
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bytevector-s32-native-ref bytevector-s32-native-set!
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bytevector-u64-ref bytevector-u64-set!
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bytevector-u64-native-ref bytevector-u64-native-set!
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bytevector-s64-ref bytevector-s64-set!
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bytevector-s64-native-ref bytevector-s64-native-set!
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bytevector-ieee-single-ref bytevector-ieee-single-set!
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bytevector-ieee-single-native-ref bytevector-ieee-single-native-set!
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bytevector-ieee-double-ref bytevector-ieee-double-set!
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bytevector-ieee-double-native-ref bytevector-ieee-double-native-set!)
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'(rnrs bytevectors))
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((atomic-box?
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make-atomic-box atomic-box-ref atomic-box-set!
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atomic-box-swap! atomic-box-compare-and-swap!)
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'(ice-9 atomic))
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((current-thread) '(ice-9 threads))
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((class-of) '(oop goops))
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((u8vector-ref
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u8vector-set! s8vector-ref s8vector-set!
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u16vector-ref u16vector-set! s16vector-ref s16vector-set!
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u32vector-ref u32vector-set! s32vector-ref s32vector-set!
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u64vector-ref u64vector-set! s64vector-ref s64vector-set!
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f32vector-ref f32vector-set! f64vector-ref f64vector-set!)
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'(srfi srfi-4))
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(else '(guile))))
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(define (primitive-ref cps name k src)
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(module-box cps src (primitive-module name) name #f #t
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(lambda (cps box)
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(with-cps cps
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(build-term
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($continue k src
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($primcall 'scm-ref/immediate '(box . 1) (box))))))))
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(define (builtin-ref cps idx k src)
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(with-cps cps
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(build-term
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($continue k src ($primcall 'builtin-ref idx ())))))
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(define (reify-clause cps)
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(with-cps cps
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(let$ body
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(with-cps-constants ((wna 'wrong-number-of-args)
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(args '(#f "Wrong number of arguments" () #f)))
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(build-term ($throw #f 'throw #f (wna args)))))
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(letk kbody ($kargs () () ,body))
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(letk kclause ($kclause ('() '() #f '() #f) kbody #f))
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kclause))
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;; A $kreceive continuation should have only one predecessor.
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(define (uniquify-receive cps k)
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(match (intmap-ref cps k)
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(($ $kreceive ($ $arity req () rest () #f) kargs)
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(with-cps cps
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(letk k ($kreceive req rest kargs))
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k))
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(_
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(with-cps cps k))))
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(define (wrap-unary cps k src wrap unwrap op param a)
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(with-cps cps
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(letv a* res*)
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(letk kres ($kargs ('res*) (res*)
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($continue k src
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($primcall 'u64->s64 #f (res*)))))
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(letk ka ($kargs ('a*) (a*)
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($continue kres src
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($primcall op param (a*)))))
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(build-term
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($continue ka src
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($primcall 's64->u64 #f (a))))))
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(define (wrap-binary cps k src wrap unwrap op param a b)
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(with-cps cps
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(letv a* b* res*)
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(letk kres ($kargs ('res*) (res*)
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($continue k src
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($primcall 'u64->s64 #f (res*)))))
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(letk kb ($kargs ('b*) (b*)
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($continue kres src
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($primcall op param (a* b*)))))
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(letk ka ($kargs ('a*) (a*)
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($continue kb src
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($primcall 's64->u64 #f (b)))))
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(build-term
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($continue ka src
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($primcall 's64->u64 #f (a))))))
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(define (wrap-binary/exp cps k src wrap unwrap op param a b-exp)
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(with-cps cps
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(letv a* b* res*)
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(letk kres ($kargs ('res*) (res*)
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($continue k src
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($primcall 'u64->s64 #f (res*)))))
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(letk kb ($kargs ('b*) (b*)
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($continue kres src
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($primcall op param (a* b*)))))
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(letk ka ($kargs ('a*) (a*)
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($continue kb src ,b-exp)))
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(build-term
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($continue ka src
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($primcall 's64->u64 #f (a))))))
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;; Primitives that we need to remove.
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(define *ephemeral-reifiers* (make-hash-table))
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(define-syntax-rule (define-ephemeral (name cps k src param arg ...)
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. body)
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(hashq-set! *ephemeral-reifiers* 'name
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(lambda (cps k src param args)
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(match args ((arg ...) (let () . body))))))
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(define-syntax-rule (define-binary-signed-ephemeral name uname)
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(define-ephemeral (name cps k src param a b)
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(wrap-binary cps k src 's64->u64 'u64->s64 'uname #f a b)))
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(define-binary-signed-ephemeral sadd uadd)
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(define-binary-signed-ephemeral ssub usub)
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(define-binary-signed-ephemeral smul umul)
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(define-syntax-rule (define-binary-signed-ephemeral/imm name/imm
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uname/imm uname)
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(define-ephemeral (name/imm cps k src param a)
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(if (and (exact-integer? param) (<= 0 param 255))
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(wrap-unary cps k src 's64->u64 'u64->s64 'uname/imm param a)
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(wrap-binary/exp cps k src 's64->u64 'u64->s64 'uname #f a
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(let ((param (logand param (1- (ash 1 64)))))
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(build-exp ($primcall 'load-u64 param ())))))))
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(define-binary-signed-ephemeral/imm sadd/immediate uadd/immediate uadd)
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(define-binary-signed-ephemeral/imm ssub/immediate usub/immediate usub)
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(define-binary-signed-ephemeral/imm smul/immediate umul/immediate umul)
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(define-ephemeral (slsh cps k src param a b)
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(wrap-binary/exp cps k src 's64->u64 'u64->s64 'ulsh #f a
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(build-exp ($values (b)))))
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(define-ephemeral (slsh/immediate cps k src param a)
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(wrap-unary cps k src 's64->u64 'u64->s64 'ulsh/immediate param a))
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;; FIXME: Instead of having to check this, instead every primcall that's
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;; not ephemeral should be handled by compile-bytecode.
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(define (compute-known-primitives)
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(define *macro-instructions*
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'(u64->s64
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s64->u64
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cache-current-module!
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cached-toplevel-box
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cached-module-box))
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(let ((table (make-hash-table)))
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(for-each
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(match-lambda ((inst . _) (hashq-set! table inst #t)))
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(instruction-list))
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(for-each
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(lambda (prim) (hashq-set! table prim #t))
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*macro-instructions*)
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table))
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(define *known-primitives* (delay (compute-known-primitives)))
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(define (known-primitive? name)
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"Is @var{name} a primitive that can be lowered to bytecode?"
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(hashq-ref (force *known-primitives*) name))
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(define (reify-primitives cps)
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(define (visit-cont label cont cps)
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(define (resolve-prim cps name k src)
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(cond
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((builtin-name->index name)
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=> (lambda (idx) (builtin-ref cps idx k src)))
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(else
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(primitive-ref cps name k src))))
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(match cont
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(($ $kfun src meta self tail #f)
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(with-cps cps
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(let$ clause (reify-clause))
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(setk label ($kfun src meta self tail clause))))
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(($ $kargs names vars ($ $continue k src ($ $prim name)))
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(with-cps cps
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(let$ body (resolve-prim name k src))
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(setk label ($kargs names vars ,body))))
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(($ $kargs names vars
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($ $continue k src ($ $primcall 'call-thunk/no-inline #f (proc))))
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(with-cps cps
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(setk label ($kargs names vars ($continue k src ($call proc ()))))))
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(($ $kargs names vars
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($ $continue k src ($ $primcall 'u64->scm/unlikely #f (u64))))
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(with-cps cps
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(setk label ($kargs names vars
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($continue k src ($primcall 'u64->scm #f (u64)))))))
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(($ $kargs names vars
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($ $continue k src ($ $primcall 's64->scm/unlikely #f (s64))))
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(with-cps cps
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(setk label ($kargs names vars
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($continue k src ($primcall 's64->scm #f (s64)))))))
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(($ $kargs names vars
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($ $continue k src ($ $primcall 'tag-fixnum/unlikely #f (s64))))
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(with-cps cps
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(setk label ($kargs names vars
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($continue k src ($primcall 'tag-fixnum #f (s64)))))))
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(($ $kargs names vars
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($ $continue k src ($ $primcall 'load-const/unlikely val ())))
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(with-cps cps
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(setk label ($kargs names vars ($continue k src ($const val))))))
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(($ $kargs names vars
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($ $continue k src ($ $primcall 'mul/immediate b (a))))
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(with-cps cps
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(letv b*)
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(letk kb ($kargs ('b) (b*)
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($continue k src ($primcall 'mul #f (a b*)))))
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(setk label ($kargs names vars
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($continue kb src ($const b))))))
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(($ $kargs names vars ($ $continue k src ($ $primcall name param args)))
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(cond
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((hashq-ref *ephemeral-reifiers* name)
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=> (lambda (reify)
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(with-cps cps
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(let$ body (reify k src param args))
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(setk label ($kargs names vars ,body)))))
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((known-primitive? name)
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;; Assume arities are correct.
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(let ()
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(define (u6? val) (and (exact-integer? val) (<= 0 val 63)))
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(define (u8? val) (and (exact-integer? val) (<= 0 val 255)))
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(define-syntax-rule (reify-constants
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wrap
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((op (pred? c) in ...) (op* out ...))
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...
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(_ default))
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(match name
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('op
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(if (pred? param)
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cps
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(match args
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((in ...)
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(with-cps cps
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(letv c)
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(letk kconst ($kargs ('c) (c)
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($continue k src
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($primcall 'op* #f (out ...)))))
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(setk label
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($kargs names vars
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($continue kconst src wrap))))))))
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...
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(_ default)))
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(define-syntax-rule (reify-scm-constants clause ...)
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(reify-constants ($const param) clause ...))
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(define-syntax-rule (reify-u64-constants clause ...)
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(reify-constants ($primcall 'load-u64 param ()) clause ...))
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(reify-scm-constants
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((add/immediate (u8? y) x) (add x y))
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((sub/immediate (u8? y) x) (sub x y))
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(_
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(reify-u64-constants
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((make-vector/immediate (u8? size) init) (make-vector size init))
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((vector-ref/immediate (u8? idx) v) (vector-ref v idx))
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((vector-set!/immediate (u8? idx) v val) (vector-set! v idx val))
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((allocate-struct/immediate (u8? size) vt) (allocate-struct vt size))
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((struct-ref/immediate (u8? idx) s) (struct-ref s idx))
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((struct-set!/immediate (u8? idx) s val) (struct-set! s idx val))
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((uadd/immediate (u8? y) x) (uadd x y))
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((usub/immediate (u8? y) x) (usub x y))
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((umul/immediate (u8? y) x) (umul x y))
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((rsh/immediate (u6? y) x) (rsh x y))
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((lsh/immediate (u6? y) x) (lsh x y))
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;; These should all be u6's by construction.
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;; ((ursh/immediate (u6? y) x) (ursh x y))
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;; ((srsh/immediate (u6? y) x) (srsh x y))
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;; ((ulsh/immediate (u6? y) x) (ulsh x y))
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(_
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(match (cons name args)
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(('allocate-words/immediate)
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(match param
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((ann . n)
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(if (u8? n)
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cps
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(with-cps cps
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(letv n*)
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(letk kop ($kargs ('n) (n*)
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($continue k src
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($primcall 'allocate-words ann (n*)))))
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(setk label ($kargs names vars
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($continue kop src
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($primcall 'load-u64 n ())))))))))
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(((or 'word-ref/immediate 'scm-ref/immediate) obj)
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(match param
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((ann . idx)
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(if (u8? idx)
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cps
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(let ((op (match name
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('word-ref/immediate 'word-ref)
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('scm-ref/immediate 'scm-ref))))
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(with-cps cps
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(letv idx*)
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(letk kop ($kargs ('idx) (idx*)
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($continue k src
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($primcall op ann (obj idx*)))))
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(setk label ($kargs names vars
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($continue kop src
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($primcall 'load-u64 idx ()))))))))))
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(((or 'word-set!/immediate 'scm-set!/immediate) obj val)
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(match param
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((ann . idx)
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(if (u8? idx)
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cps
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(let ((op (match name
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('word-set!/immediate 'word-set!)
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('scm-set!/immediate 'scm-set!))))
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(with-cps cps
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(letv idx*)
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(letk kop ($kargs ('idx) (idx*)
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($continue k src
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($primcall op ann (obj idx*)))))
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(setk label ($kargs names vars
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($continue kop src
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($primcall 'load-u64 idx ()))))))))))
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(_ cps))))))))
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(param (error "unexpected param to reified primcall" name))
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(else
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(with-cps cps
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(letv proc)
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(letk krecv ($kreceive '(res) #f k))
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(letk kproc ($kargs ('proc) (proc)
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($continue krecv src ($call proc args))))
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(let$ body (resolve-prim name kproc src))
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(setk label ($kargs names vars ,body))))))
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(($ $kargs names vars ($ $branch kf kt src name param args))
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(let ()
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(define (u11? val) (<= 0 val #x7ff))
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(define (u12? val) (<= 0 val #xfff))
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(define (s12? val) (<= (- #x800) val #x7ff))
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(define-syntax-rule (reify-constants ((op (pred? c) in ...)
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wrap-op (op* out ...))
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...
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(_ default))
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(match name
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('op
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(if (pred? param)
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cps
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(match args
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((in ...)
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(with-cps cps
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(letv c)
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(letk kconst
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($kargs ('c) (c)
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($branch kf kt src 'op* #f (out ...))))
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(setk label
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($kargs names vars
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($continue kconst src
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($primcall 'wrap-op param ())))))))))
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...
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(_ default)))
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(reify-constants
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((u64-imm-= (u11? b) a) load-u64 (u64-= a b))
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((u64-imm-< (u12? b) a) load-u64 (u64-< a b))
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((imm-u64-< (u12? a) b) load-u64 (u64-< a b))
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((s64-imm-= (s12? b) a) load-s64 (s64-= a b))
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((s64-imm-< (s12? b) a) load-s64 (s64-< a b))
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((imm-s64-< (s12? a) b) load-s64 (s64-< a b))
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(_ cps))))
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(($ $kargs names vars ($ $continue k src ($ $call proc args)))
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(with-cps cps
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(let$ k (uniquify-receive k))
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(setk label ($kargs names vars
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($continue k src ($call proc args))))))
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(($ $kargs names vars ($ $continue k src ($ $callk k* proc args)))
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(with-cps cps
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(let$ k (uniquify-receive k))
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(setk label ($kargs names vars
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($continue k src ($callk k* proc args))))))
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(_ cps)))
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(with-fresh-name-state cps
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(persistent-intmap (intmap-fold visit-cont cps cps))))
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