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;;;; profiler.scm - Support code for profiling applications
;
; Copyright (c) 2008-2020, The CHICKEN Team
; Copyright (c) 2000-2007, Felix L. Winkelmann
; All rights reserved.
;
; Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following
; conditions are met:
;
; Redistributions of source code must retain the above copyright notice, this list of conditions and the following
; disclaimer.
; Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
; disclaimer in the documentation and/or other materials provided with the distribution.
; Neither the name of the author nor the names of its contributors may be used to endorse or promote
; products derived from this software without specific prior written permission.
;
; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
; AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
; CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
; CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
; SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
; OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
; POSSIBILITY OF SUCH DAMAGE.
(declare
(unit profiler)
(hide ##sys#profile-name ##sys#profile-vector-list cpu-ms empty-file?)
(unsafe)
(disable-interrupts))
(import chicken.base chicken.fixnum scheme)
(include "common-declarations.scm")
(define-foreign-variable profile-id int "C_getpid()")
(define-constant profile-info-entry-size 5)
(define empty-file?
(foreign-lambda* bool ((scheme-object p))
"C_return(ftell(C_port_file(p)) == 0);"))
;;; Globals:
(define ##sys#profile-vector-list '())
(define ##sys#profile-name #f)
(define ##sys#profile-append-mode #f)
;;; Initialize profile counter vector:
(define ##sys#register-profile-info
(lambda (size filename)
(when filename
(set! ##sys#profile-name
(if (string? filename)
filename
(string-append "PROFILE." (number->string profile-id))))
(let ((oldeh (exit-handler))
(oldieh (implicit-exit-handler)))
(exit-handler
(lambda args
(##sys#finish-profile)
(apply oldeh args) ) )
(implicit-exit-handler
(lambda ()
(##sys#finish-profile)
(oldieh) ) ) ) )
;; entry: [name, count, time0, total, pending]
(let ((vec (make-vector (fx* size profile-info-entry-size) 0)))
(set! ##sys#profile-vector-list (cons vec ##sys#profile-vector-list))
vec) ) )
(define (##sys#set-profile-info-vector! vec i x)
(##sys#setslot vec (fx* i profile-info-entry-size) x) )
;;; Entry and exit into/out of profiled lambda:
;; XXX TODO: Should be changed to unsigned-integer64 after bootstrapping
(define cpu-ms (foreign-lambda unsigned-integer "C_cpu_milliseconds"))
(define ##sys#profile-entry
(let ((maxfix most-positive-fixnum))
(lambda (index vec)
(let* ([i (fx* index profile-info-entry-size)]
[ic (fx+ i 1)]
[count (##sys#slot vec ic)]
[it0 (fx+ i 2)]
[ip (fx+ i 4)]
[ipc (##sys#slot vec ip)] )
(##sys#setislot
vec ic
(cond ((not count) #f)
((eq? maxfix count) #f)
(else (fx+ count 1))))
(when (eq? 0 ipc)
(##sys#setslot vec it0 (cpu-ms)))
(##sys#setislot vec ip (fx+ ipc 1)) ) ) ) )
(define (##sys#profile-exit index vec)
(let* ([i (fx* index profile-info-entry-size)]
[it0 (fx+ i 2)]
[it (fx+ i 3)]
[ip (fx+ i 4)]
[ipc (fx- (##sys#slot vec ip) 1)] )
(##sys#setislot vec ip ipc)
(when (eq? 0 ipc)
(let ((t (##sys#slot vec it)))
(##sys#setslot
vec it
(+ (if (eq? t 0) 0 t)
(- (cpu-ms) (##sys#slot vec it0))))))))
;;; Generate profile:
(define ##sys#finish-profile
(let ([with-output-to-file with-output-to-file]
[write-char write-char]
[write write] )
(lambda ()
(when (##sys#debug-mode?)
(##sys#print "[debug] writing profile...\n" #f ##sys#standard-error) )
(apply
with-output-to-file ##sys#profile-name
(lambda ()
(when (empty-file? (current-output-port)) ; header needed?
(write 'instrumented)
(write-char #\newline))
(for-each
(lambda (vec)
(let ([len (##sys#size vec)])
(do ([i 0 (fx+ i profile-info-entry-size)])
((fx>= i len))
(write-char #\()
(write (##sys#slot vec i))
(write-char #\space)
(write (##sys#slot vec (fx+ i 1)))
(write-char #\space)
(write (##sys#slot vec (fx+ i 3)))
(write-char #\))
(write-char #\newline) ) ) )
##sys#profile-vector-list) )
(if ##sys#profile-append-mode
'(#:append)
'() ) ) ) ) )
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