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4fb538e90e
* module/language/bytecode.scm (*macro-instruction-arities*): * module/language/cps/compile-bytecode.scm (compile-function): * module/language/cps/effects-analysis.scm (current-module): * module/language/cps/primitives.scm (*macro-instruction-arities*): * module/language/cps/prune-top-level-scopes.scm (compute-used-scopes): (prune-top-level-scopes): * module/language/cps/reify-primitives.scm (module-box): * module/language/cps/slot-allocation.scm (compute-needs-slot): * module/language/tree-il/compile-cps.scm (toplevel-box): (module-box, capture-toplevel-scope): Move the primcalls that deal with top-level references to use immediate parameters.
61 lines
2.1 KiB
Scheme
61 lines
2.1 KiB
Scheme
;;; Continuation-passing style (CPS) intermediate language (IL)
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;; Copyright (C) 2014, 2015, 2017 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 simple pass to prune unneeded top-level scopes.
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;;;
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;;; Code:
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(define-module (language cps prune-top-level-scopes)
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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 intmap)
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#:use-module (language cps intset)
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#:export (prune-top-level-scopes))
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(define (compute-used-scopes conts)
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(persistent-intset
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(intmap-fold
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(lambda (label cont used-scopes)
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(match cont
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(($ $kargs _ _
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($ $continue k src
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($ $primcall 'cached-toplevel-box (scope name bound?))))
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(intset-add! used-scopes scope))
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(_
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used-scopes)))
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conts
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empty-intset)))
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(define (prune-top-level-scopes conts)
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(let* ((used-scopes (compute-used-scopes conts)))
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(intmap-map
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(lambda (label cont)
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(match cont
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(($ $kargs names vars
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($ $continue k src
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($ $primcall 'cache-current-module! (scope-id) (module))))
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(if (intset-ref used-scopes scope-id)
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cont
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(build-cont ($kargs names vars
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($continue k src ($values ()))))))
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(_
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cont)))
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conts)))
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