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; intern.scm - private api functions for Sassy
; Copyright (C) 2005 Jonathan Kraut
; 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 2.1 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 St, Fifth Floor, Boston, MA 02110-1301 USA
; Contact:
; Jonathan Kraut
; 4130 43 ST #C2
; Sunnyside, NY 11104
; jak76@columbia.edu
; see file COPYING in the top of Sassy's distribution directory
; module intern
; import api push-stacks srfi-69
; export all
; Looks up symbol-name (a scheme symbol) in the symbol-table of
; sassy-output. If no record exists for that name, it creates a fresh
; one, in the table. Then for each item in the list of field-value
; pairs, it sets the corresponding field of the sassy-symbol to the
; value (or in the case of the 'unres field, adds the value to the
; list stored there). The pairs must be proper lists. The result is
; the sassy-symbol that was modified.
; Anytime a new offset is given via the field-pair '(offset <value>),
; all the back-patchers stored in the unres field of the sassy-symbol are
; applied to the <value>.
(define (sassy-symbol-set! sassy-output symbol-name . list-of-field-pairs)
(let ((exists (sassy-symbol-exists-env? sassy-output symbol-name)))
(when (not exists)
(set! exists (make-sassy-symbol symbol-name 'local #f #f #f '() #f))
(let iter ((t (sassy-symbol-table sassy-output)))
(if (hash-table? (car t))
(hash-table-set! (car t) symbol-name exists)
(iter (cdr t)))))
(for-each
(lambda (field-pair)
(case (car field-pair)
((name) (sassy-symbol-name-set! exists (cadr field-pair)))
((scope) (sassy-symbol-scope-set! exists (cadr field-pair)))
((section) (sassy-symbol-section-set! exists (cadr field-pair)))
((size) (sassy-symbol-size-set! exists (cadr field-pair)))
((offset)
(sassy-symbol-offset-set! exists (cadr field-pair))
(for-each (lambda (back-patcher)
(back-patcher (cadr field-pair)))
(sassy-symbol-unres exists)))
((unres)
(sassy-symbol-unres-set!
exists (cons (cadr field-pair) (sassy-symbol-unres exists))))
((exp) (sassy-symbol-exp-set! exists (cadr field-pair)))))
list-of-field-pairs)
exists))
(define (sassy-symbol-exists-env? sassy-output name)
(let iter ((rst (sassy-symbol-table sassy-output)))
(cond ((hash-table? (car rst))
(hash-table-ref (car rst) name (lambda () #f)))
((eq? name (sassy-symbol-name (car rst))) (car rst))
(else (iter (cdr rst))))))
(define (sassy-symbol-defined? sassy-output name)
(let ((maybe (sassy-symbol-exists-env? sassy-output name)))
(cond ((not maybe) #f)
((eq? 'import (sassy-symbol-scope maybe)) #t)
((sassy-symbol-offset maybe) #t)
(else #f))))
(define (sassy-symbol-def-error sassy-output name)
(or (not (sassy-symbol-defined? sassy-output name))
(error "re-definition of a previously defined/imported symbol" name)))
(define new-block
(let ((c 0))
(lambda () ; should use native gensym
(let ((n (string->symbol (string-append "%!%!%!block"
(number->string c)))))
(set! c (+ c 1))
n))))
; extra-proc is a proc of one argument that does something with each
; new sassy-symbol record, or #f
(define (setup-locals locals outp extra-proc)
(let* ((newb (new-block))
(old-env (sassy-symbol-table outp))
(restore! (lambda ()
(sassy-symbol-table-set! outp old-env))))
(sassy-symbol-table-set!
outp
(let iter ((rest locals))
(if (null? rest)
old-env
(let ((new-sym (make-sassy-symbol
(valid-label (car rest)) newb 'text #f #f '() #f)))
(if extra-proc
(extra-proc new-sym))
(cons new-sym (iter (cdr rest)))))))
restore!))
(define valid-label
(let ((keywords '(seq begin inv if iter while with-win
with-lose with-win-lose esc
mark leap label)))
(lambda (x) (or (and (symbol? x)
(not (member x keywords))
x)
(error "sassy: invalid label" x)))))
(define (get-reloc-target target outp)
(if (symbol? target)
(let ((s (sassy-symbol-exists-env? outp target)))
(if s
(case (sassy-symbol-scope s)
((local import export) target)
(else #f))
target))
#f))
(define (check-label-size size cur-byte-size key label)
(if (not (= size cur-byte-size))
(error
"wrong data size for label or custom reloc under "
`(bits ,(* 8 cur-byte-size)) (list key label))))
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