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f4c50447dd
* libguile/frames.c (scm_frame_return_values): New function, for use when a frame is at "return-values". (scm_init_frames_builtins): Register frame-return-values. * libguile/vm-engine.c (RETURN_HOOK): Rename from POP_CONTINUATION_HOOK. (call, call-label): Remove PUSH_CONTINUATION_HOOK; it's unneeded, as you can always check the FP from an apply hook. (return-values): Run return hook before popping frame. * libguile/vm.c (vm_dispatch_return_hook): Rename from vm_dispatch_pop_continuation_hook. Remove push continuation hook. (scm_vm_return_hook): * libguile/vm.h (SCM_VM_PUSH_CONTINUATION_HOOK): Remove. (SCM_VM_RETURN_HOOK): Rename from SCM_VM_POP_CONTINUATION_HOOK. * module/system/vm/frame.scm (frame-return-values): Export. * module/system/vm/trace.scm (print-return, trace-calls-to-procedure) (trace-calls-in-procedure): Adapt to not receiving values as arguments. * module/system/vm/traps.scm (trap-in-procedure, trap-frame-finish): Adapt to return hook coming from returning frame. (program-sources-by-line): Update to use match instead of pmatch. * module/system/vm/traps.scm (trap-in-dynamic-extent) (trap-calls-to-procedure): Adapt to return hook not receiving values. * module/system/vm/vm.scm: Remove push continuation hook and rename return hook.
122 lines
4.8 KiB
Scheme
122 lines
4.8 KiB
Scheme
;;; Guile VM tracer
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;; Copyright (C) 2001,2009-2010,2012-2014,2018 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 (system vm program)
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#:use-module (system vm traps)
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#:use-module (rnrs bytevectors)
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#:use-module (ice-9 format)
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#:export (trace-calls-in-procedure
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trace-calls-to-procedure
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trace-instructions-in-procedure
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call-with-trace))
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(define (build-prefix prefix depth infix numeric-format max-indent)
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(let lp ((indent "") (n 0))
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(cond
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((= n depth)
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(string-append prefix indent))
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((< (+ (string-length indent) (string-length infix)) max-indent)
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(lp (string-append indent infix) (1+ n)))
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(else
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(string-append prefix indent (format #f numeric-format depth))))))
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(define (print-application frame depth width prefix max-indent)
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(let ((prefix (build-prefix prefix depth "| " "~d> " max-indent)))
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(format (current-error-port) "~a~v:@y\n"
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prefix
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width
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(frame-call-representation frame #:top-frame? #t))))
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(define (print-return frame depth width prefix max-indent)
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(let ((prefix (build-prefix prefix depth "| " "~d< "max-indent))
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(values (frame-return-values frame)))
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(case (length values)
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((0)
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(format (current-error-port) "~ano values\n" prefix))
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((1)
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(format (current-error-port) "~a~v:@y\n"
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prefix
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width
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(car values)))
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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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prefix (length values)
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(map (lambda (val)
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(format #f "~v:@y" width val))
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values))))))
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(define* (trace-calls-to-procedure proc #:key (width 80)
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(prefix "trace: ")
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(max-indent (- width 40)))
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(define (apply-handler frame depth)
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(print-application frame depth width prefix max-indent))
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(define (return-handler frame depth values)
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(print-return frame depth width prefix max-indent))
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(trap-calls-to-procedure proc apply-handler return-handler))
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(define* (trace-calls-in-procedure proc #:key (width 80)
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(prefix "trace: ")
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(max-indent (- width 40)))
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(define (apply-handler frame depth)
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(print-application frame depth width prefix max-indent))
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(define (return-handler frame depth)
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(print-return frame depth width prefix max-indent))
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(trap-calls-in-dynamic-extent proc apply-handler return-handler))
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(define* (trace-instructions-in-procedure proc #:key (width 80)
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(max-indent (- width 40)))
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(define (trace-next frame)
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;; FIXME: We could disassemble this instruction here.
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(let ((ip (frame-instruction-pointer frame)))
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(format #t "0x~x\n" ip)))
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(trap-instructions-in-dynamic-extent proc trace-next))
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;; Note that because this procedure manipulates the VM trace level
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;; directly, it doesn't compose well with traps at the REPL.
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;;
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(define* (call-with-trace thunk #:key (calls? #t) (instructions? #f)
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(width 80) (max-indent (- width 40)))
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(let ((call-trap #f)
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(inst-trap #f))
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(dynamic-wind
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(lambda ()
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(if calls?
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(set! call-trap
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(trace-calls-in-procedure thunk #:width width
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#:max-indent max-indent)))
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(if instructions?
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(set! inst-trap
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(trace-instructions-in-procedure thunk #:width width
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#:max-indent max-indent)))
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(set-vm-trace-level! (1+ (vm-trace-level))))
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thunk
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(lambda ()
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(set-vm-trace-level! (1- (vm-trace-level)))
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(if call-trap (call-trap))
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(if inst-trap (inst-trap))
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(set! call-trap #f)
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(set! inst-trap #f)))))
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