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+;;; Continuation-passing style (CPS) intermediate language (IL)
+
+;; Copyright (C) 2016, 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:
+;;;
+;;; A pass to add "instrument-loop" primcalls at loop headers.
+;;;
+;;; Code:
+
+(define-module (language cps 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
+ (($ $kargs names vars ($ $continue k))
+ (maybe-add-header label k headers))
+ (($ $kargs names vars ($ $branch kf kt))
+ (maybe-add-header label kf (maybe-add-header label kt headers)))
+ (_ headers)))
+ (persistent-intset (intmap-fold visit-cont cps empty-intset)))
+
+(define (add-loop-instrumentation cps)
+ (define (add-instrumentation label cps)
+ (match (intmap-ref cps label)
+ (($ $kargs names vars term)
+ (with-cps cps
+ (letk k ($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)))))