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;;; Guile VM frame functions
;;; Copyright (C) 2001, 2009 Free Software Foundation, Inc.
;;; Copyright (C) 2005 Ludovic Courtès <ludovic.courtes@laas.fr>
;;;
;;; This program is free software; you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 2 of the License, or
;;; (at your option) any later version.
;;;
;;; This program 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 General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program; if not, write to the Free Software
;;; Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
;;; Code:
(define-module (system vm frame)
#:use-module (system vm program)
#:use-module (system vm instruction)
#:use-module ((srfi srfi-1) #:select (fold))
#:export (vm-frame?
vm-frame-program
vm-frame-local-ref vm-frame-local-set!
vm-frame-return-address vm-frame-mv-return-address
vm-frame-dynamic-link
vm-frame-stack
vm-frame-number vm-frame-address
make-frame-chain
print-frame print-frame-chain-as-backtrace
frame-arguments frame-local-variables
frame-environment
frame-variable-exists? frame-variable-ref frame-variable-set!
frame-object-name
frame-local-ref frame-local-set!
frame-return-address frame-program
frame-dynamic-link heap-frame?))
(load-extension "libguile" "scm_init_frames")
;;;
;;; Frame chain
;;;
(define vm-frame-number (make-object-property))
(define vm-frame-address (make-object-property))
;; FIXME: the header.
(define (bootstrap-frame? frame)
(let ((code (objcode->bytecode (program-objcode (frame-program frame)))))
(and (= (uniform-vector-ref code (1- (uniform-vector-length code)))
(instruction->opcode 'halt)))))
(define (make-frame-chain frame addr)
(define (make-rest)
(make-frame-chain (frame-dynamic-link frame)
(frame-return-address frame)))
(cond
((or (eq? frame #t) (eq? frame #f))
;; handle #f or #t dynamic links
'())
((bootstrap-frame? frame)
(make-rest))
(else
(let ((chain (make-rest)))
(set! (frame-number frame) (length chain))
(set! (frame-address frame)
(- addr (program-base (frame-program frame))))
(cons frame chain)))))
;;;
;;; Pretty printing
;;;
(define (frame-line-number frame)
(let ((addr (frame-address frame)))
(cond ((assv addr (program-sources (frame-program frame)))
=> source:line)
(else (format #f "@~a" addr)))))
(define (frame-file frame prev)
(let ((sources (program-sources (frame-program frame))))
(if (null? sources)
prev
(or (source:file (car sources))
"current input"))))
(define (print-frame frame)
(format #t "~4@a: ~a ~s\n" (frame-line-number frame) (frame-number frame)
(frame-call-representation frame)))
(define (frame-call-representation frame)
(define (abbrev x)
(cond ((list? x)
(if (> (length x) 4)
(list (abbrev (car x)) (abbrev (cadr x)) '...)
(map abbrev x)))
((pair? x)
(cons (abbrev (car x)) (abbrev (cdr x))))
((vector? x)
(case (vector-length x)
((0) x)
((1) (vector (abbrev (vector-ref x 0))))
(else (vector (abbrev (vector-ref x 0)) '...))))
(else x)))
(abbrev (cons (frame-program-name frame) (frame-arguments frame))))
(define (print-frame-chain-as-backtrace frames)
(if (null? frames)
(format #t "No backtrace available.\n")
(begin
(format #t "VM backtrace:\n")
(fold (lambda (frame file)
(let ((new-file (frame-file frame file)))
(if (not (equal? new-file file))
(format #t "In ~a:\n" new-file))
(print-frame frame)
new-file))
'no-file
frames))))
(define (frame-program-name frame)
(let ((prog (frame-program frame))
(link (frame-dynamic-link frame)))
(or (program-name prog)
(object-property prog 'name)
(and (heap-frame? link) (frame-address link)
(frame-object-name link (1- (frame-address link)) prog))
(hash-fold (lambda (s v d) (if (and (variable-bound? v)
(eq? prog (variable-ref v)))
s d))
prog (module-obarray (current-module))))))
;;;
;;; Frames
;;;
(define (frame-arguments frame)
(let* ((prog (frame-program frame))
(arity (program-arity prog)))
(do ((n (+ (arity:nargs arity) -1) (1- n))
(l '() (cons (frame-local-ref frame n) l)))
((< n 0) l))))
(define (frame-local-variables frame)
(let* ((prog (frame-program frame))
(arity (program-arity prog)))
(do ((n (+ (arity:nargs arity) (arity:nlocs arity) -1) (1- n))
(l '() (cons (frame-local-ref frame n) l)))
((< n 0) l))))
(define (frame-binding-ref frame binding)
(let ((x (frame-local-ref frame (binding:index binding))))
(if (and (binding:boxed? binding) (variable? x))
(variable-ref x)
x)))
(define (frame-binding-set! frame binding val)
(if (binding:boxed? binding)
(let ((v (frame-local-ref frame binding)))
(if (variable? v)
(variable-set! v val)
(frame-local-set! frame binding (make-variable val))))
(frame-local-set! frame binding val)))
;; FIXME handle #f program-bindings return
(define (frame-bindings frame addr)
(filter (lambda (b) (and (>= addr (binding:start b))
(<= addr (binding:end b))))
(program-bindings (frame-program frame))))
(define (frame-lookup-binding frame addr sym)
(assq sym (reverse (frame-bindings frame addr))))
(define (frame-object-binding frame addr obj)
(do ((bs (frame-bindings frame addr) (cdr bs)))
((or (null? bs) (eq? obj (frame-binding-ref frame (car bs))))
(and (pair? bs) (car bs)))))
(define (frame-environment frame addr)
(map (lambda (binding)
(cons (binding:name binding) (frame-binding-ref frame binding)))
(frame-bindings frame addr)))
(define (frame-variable-exists? frame addr sym)
(if (frame-lookup-binding frame addr sym) #t #f))
(define (frame-variable-ref frame addr sym)
(cond ((frame-lookup-binding frame addr sym) =>
(lambda (binding) (frame-binding-ref frame binding)))
(else (error "Unknown variable:" sym))))
(define (frame-variable-set! frame addr sym val)
(cond ((frame-lookup-binding frame addr sym) =>
(lambda (binding) (frame-binding-set! frame binding val)))
(else (error "Unknown variable:" sym))))
(define (frame-object-name frame addr obj)
(cond ((frame-object-binding frame addr obj) => binding:name)
(else #f)))
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