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120 lines
4.3 KiB
Scheme
120 lines
4.3 KiB
Scheme
;;; Guile Emacs Lisp
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;;; Copyright (C) 2009, 2010 Free Software Foundation, Inc.
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;;;
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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 (language elisp bindings)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-8)
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#:use-module (srfi srfi-9)
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#:use-module (srfi srfi-26)
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#:export (make-bindings
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global?
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mark-global!
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map-globals
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with-lexical-bindings
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with-dynamic-bindings
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get-lexical-binding))
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;;; This module defines routines to handle analysis of symbol bindings
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;;; used during elisp compilation. This data allows to collect the
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;;; symbols, for which globals need to be created, or mark certain
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;;; symbols as lexically bound.
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;;;
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;;; Needed globals are stored in an association-list that stores a list
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;;; of symbols for each module they are needed in.
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;;;
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;;; The lexical bindings of symbols are stored in a hash-table that
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;;; associates symbols to fluids; those fluids are used in the
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;;; with-lexical-binding and with-dynamic-binding routines to associate
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;;; symbols to different bindings over a dynamic extent.
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;;; Record type used to hold the data necessary.
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(define-record-type bindings
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(%make-bindings globals lexical-bindings)
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bindings?
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(globals globals set-globals!)
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(lexical-bindings lexical-bindings set-lexical-bindings!))
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;;; Construct an 'empty' instance of the bindings data structure to be
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;;; used at the start of a fresh compilation.
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(define (make-bindings)
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(%make-bindings '() (make-hash-table)))
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(define (global? bindings sym module)
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(and=> (assoc-ref (globals bindings) module) (cut memq sym <>)))
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;;; Mark that a given symbol is needed as global in the specified
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;;; slot-module.
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(define (mark-global! bindings sym module)
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(let* ((old-globals (globals bindings))
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(old-in-module (or (assoc-ref old-globals module) '()))
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(new-in-module (lset-adjoin eq? old-in-module sym))
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(new-globals (assoc-set! old-globals module new-in-module)))
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(set-globals! bindings new-globals)))
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;;; Cycle through all globals needed in order to generate the code for
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;;; their creation or some other analysis.
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(define (map-globals bindings proc)
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(append-map
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(lambda (module+symbols)
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(receive (module symbols) (car+cdr module+symbols)
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(map (cut proc module <>) symbols)))
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(globals bindings)))
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;;; Get the current lexical binding (gensym it should refer to in the
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;;; current scope) for a symbol or #f if it is dynamically bound.
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(define (get-lexical-binding bindings sym)
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(let* ((lex (lexical-bindings bindings))
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(slot (hash-ref lex sym #f)))
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(if slot
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(fluid-ref slot)
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#f)))
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;;; Establish a binding or mark a symbol as dynamically bound for the
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;;; extent of calling proc.
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(define (with-symbol-bindings bindings syms targets proc)
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(if (or (not (list? syms))
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(not (and-map symbol? syms)))
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(error "can't bind non-symbols" syms))
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(let ((lex (lexical-bindings bindings)))
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(for-each (lambda (sym)
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(if (not (hash-ref lex sym))
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(hash-set! lex sym (make-fluid))))
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syms)
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(with-fluids* (map (lambda (sym) (hash-ref lex sym)) syms)
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targets
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proc)))
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(define (with-lexical-bindings bindings syms targets proc)
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(if (or (not (list? targets))
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(not (and-map symbol? targets)))
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(error "invalid targets for lexical binding" targets)
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(with-symbol-bindings bindings syms targets proc)))
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(define (with-dynamic-bindings bindings syms proc)
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(with-symbol-bindings bindings
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syms
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(map (lambda (el) #f) syms)
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proc))
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