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;;; Continuation-passing style (CPS) intermediate language (IL)
;; Copyright (C) 2016, 2017, 2018, 2020, 2023 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:
;;;
;;; A pass to add "instrument-loop" primcalls at loop headers.
;;;
;;; Code:
(define-module (language cps guile-vm loop-instrumentation)
#:use-module (ice-9 match)
#:use-module (language cps)
#:use-module (language cps utils)
#:use-module (language cps with-cps)
#:use-module (language cps intmap)
#:use-module (language cps intset)
#:use-module (language cps renumber)
#:export (add-loop-instrumentation))
(define (compute-loop-headers cps)
(define (maybe-add-header label k headers)
"Add K to headers if it is a target of a backward branch."
(if (<= k label)
(intset-add! headers k)
headers))
(define (visit-cont label cont headers)
(match cont
(($ $kargs names vars ($ $continue k))
(maybe-add-header label k headers))
(($ $kargs names vars ($ $branch kf kt))
(maybe-add-header label kf (maybe-add-header label kt headers)))
(($ $kargs names vars ($ $switch kf kt*))
(fold1 (lambda (k headers) (maybe-add-header label k headers))
(cons kf kt*)
headers))
(_ headers)))
(persistent-intset (intmap-fold visit-cont cps empty-intset)))
(define (add-loop-instrumentation cps)
(define (add-instrumentation label cps)
(match (intmap-ref cps label)
(($ $kargs names vars term)
(with-cps cps
(letk k ($kargs () () ,term))
(setk label
($kargs names vars
($continue k #f
($primcall 'instrument-loop #f ()))))))))
(let* ((cps (renumber cps))
(headers (compute-loop-headers cps)))
(with-fresh-name-state cps
(persistent-intmap (intset-fold add-instrumentation headers cps)))))
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