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7ea3e4ff28
* module/system/vm/trace.scm (vm-trace): Add a #:width argument. Print return values, as Chez Scheme does.
121 lines
4 KiB
Scheme
121 lines
4 KiB
Scheme
;;; Guile VM tracer
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;; Copyright (C) 2001, 2009, 2010 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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;;; Code:
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(define-module (system vm trace)
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#:use-module (system base syntax)
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#:use-module (system vm vm)
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#:use-module (system vm frame)
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#:use-module (ice-9 format)
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#:export (vm-trace))
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(define* (vm-trace vm thunk #:key (calls? #t) (instructions? #f) (width 80))
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(define *call-depth* #f)
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(define *saved-call-depth* #f)
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(define (trace-enter frame)
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(cond
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(*call-depth*
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(set! *call-depth* (1+ *call-depth*)))))
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(define (trace-exit frame)
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(cond
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((not *call-depth*))
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(else
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(set! *call-depth* (1- *call-depth*)))))
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(define (trace-apply frame)
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(cond
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(*call-depth*
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(format (current-error-port) "~a~v:@y\n"
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(make-string (1- *call-depth*) #\|)
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(max (- width *call-depth* 1) 1)
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(frame-call-representation frame)))
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((eq? (frame-procedure frame) thunk)
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(set! *call-depth* 1))))
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(define (trace-return frame)
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;; nop, though we could print the return i guess
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(cond
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((and *call-depth* (< *call-depth* 0))
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;; leaving the thunk
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(set! *call-depth* #f))
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(*call-depth*
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(let* ((len (frame-num-locals frame))
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(nvalues (frame-local-ref frame (1- len))))
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(cond
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((= nvalues 1)
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(format (current-error-port) "~a~v:@y\n"
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(make-string *call-depth* #\|)
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width (frame-local-ref frame (- len 2))))
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(else
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;; this should work, but there appears to be a bug
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;; "~a~d values:~:{ ~v:@y~}\n"
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(format (current-error-port) "~a~d values:~{ ~a~}\n"
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(make-string *call-depth* #\|)
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nvalues
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(let lp ((vals '()) (i 0))
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(if (= i nvalues)
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vals
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(lp (cons (format #f "~v:@y" width
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(frame-local-ref frame (- len 2 i)))
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vals)
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(1+ i)))))))))))
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(define (trace-next frame)
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(format #t "0x~8X" (frame-instruction-pointer frame))
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;; should disassemble the thingy; could print stack, or stack trace,
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;; ...
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)
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(define (vm-trace-on!)
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(if calls?
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(begin
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(add-hook! (vm-exit-hook vm) trace-exit)
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(add-hook! (vm-enter-hook vm) trace-enter)
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(add-hook! (vm-apply-hook vm) trace-apply)
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(add-hook! (vm-return-hook vm) trace-return)))
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(if instructions?
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(add-hook! (vm-next-hook vm) trace-next))
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;; boot, halt, and break are the other ones
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(set-vm-trace-level! vm (1+ (vm-trace-level vm)))
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(set! *call-depth* *saved-call-depth*))
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(define (vm-trace-off!)
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(set! *saved-call-depth* *call-depth*)
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(set! *call-depth* #f)
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(set-vm-trace-level! vm (1- (vm-trace-level vm)))
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(if calls?
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(begin
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(remove-hook! (vm-exit-hook vm) trace-exit)
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(remove-hook! (vm-enter-hook vm) trace-enter)
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(remove-hook! (vm-apply-hook vm) trace-apply)
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(remove-hook! (vm-return-hook vm) trace-return)))
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(if instructions?
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(remove-hook! (vm-next-hook vm) trace-next)))
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(dynamic-wind
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vm-trace-on!
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(lambda () (vm-apply vm thunk '()))
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vm-trace-off!))
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