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b34e25359a
* module/system/base/language.scm (<language>): Add 'for-humans?' field, and export new 'language-for-humans?' predicate. * doc/ref/compiler.texi (Compiler Tower): Document. * module/language/assembly/spec.scm, module/language/bytecode/spec.scm, module/language/glil/spec.scm, module/language/objcode/spec.scm, module/language/tree-il/spec.scm, module/language/value/spec.scm: Mark these languages as 'for-humans?'.
119 lines
3.7 KiB
Scheme
119 lines
3.7 KiB
Scheme
;;; Multi-language support
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;; Copyright (C) 2001, 2009, 2010, 2011, 2013 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
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;; 02110-1301 USA
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;;; Code:
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(define-module (system base language)
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#:use-module (system base syntax)
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#:export (define-language language? lookup-language make-language
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language-name language-title language-reader
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language-printer language-parser
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language-compilers language-decompilers language-evaluator
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language-joiner language-for-humans?
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language-make-default-environment
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lookup-compilation-order lookup-decompilation-order
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invalidate-compilation-cache! default-environment
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*current-language*)
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#:re-export (current-language))
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;;;
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;;; Language class
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;;;
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(define-record/keywords <language>
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name
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title
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reader
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printer
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(parser #f)
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(compilers '())
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(decompilers '())
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(evaluator #f)
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(joiner #f)
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(for-humans? #t)
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(make-default-environment make-fresh-user-module))
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(define-macro (define-language name . spec)
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`(begin
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(invalidate-compilation-cache!)
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(define ,name (make-language #:name ',name ,@spec))))
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(define (lookup-language name)
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(let ((m (resolve-module `(language ,name spec))))
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(if (module-bound? m name)
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(module-ref m name)
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(error "no such language" name))))
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(define *compilation-cache* '())
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(define *decompilation-cache* '())
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(define (invalidate-compilation-cache!)
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(set! *decompilation-cache* '())
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(set! *compilation-cache* '()))
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(define (compute-translation-order from to language-translators)
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(cond
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((not (language? to))
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(compute-translation-order from (lookup-language to) language-translators))
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(else
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(let lp ((from from) (seen '()))
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(cond
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((not (language? from))
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(lp (lookup-language from) seen))
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((eq? from to) (reverse! seen))
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((memq from seen) #f)
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(else (or-map (lambda (pair)
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(lp (car pair) (acons from (cdr pair) seen)))
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(language-translators from))))))))
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(define (lookup-compilation-order from to)
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(let ((key (cons from to)))
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(or (assoc-ref *compilation-cache* key)
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(let ((order (compute-translation-order from to language-compilers)))
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(set! *compilation-cache*
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(acons key order *compilation-cache*))
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order))))
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(define (lookup-decompilation-order from to)
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(let ((key (cons from to)))
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(or (assoc-ref *decompilation-cache* key)
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;; trickery!
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(let ((order (and=>
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(compute-translation-order to from language-decompilers)
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reverse!)))
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(set! *decompilation-cache* (acons key order *decompilation-cache*))
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order))))
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(define (default-environment lang)
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"Return the default compilation environment for source language LANG."
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((language-make-default-environment
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(if (language? lang) lang (lookup-language lang)))))
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;;;
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;;; Current language
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;;;
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;; Deprecated; use current-language instead.
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(define *current-language* (parameter-fluid current-language))
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