mirror of
https://git.savannah.gnu.org/git/guile.git
synced 2025-05-13 17:20:21 +02:00
107139eaad
* ice-9/boot-9.scm (start-stack): Define as a defmacro instead of an acro in C. We have a way to delay evaluation of the exp, after all: putting it in a thunk is sufficient. * libguile/debug.h: * libguile/debug.c (scm_sys_start_stack): Renamed from scm_start_stack, and exposed to the user. Takes a thunk instead of an expression + environment. (scm_m_start_stack): Remove this acro. * module/language/scheme/translate.scm (custom-transformer-table): Remove the start-stack special case.
442 lines
16 KiB
Scheme
442 lines
16 KiB
Scheme
;;; Guile Scheme specification
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;; Copyright (C) 2001 Free Software Foundation, Inc.
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;;
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;; This program 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
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this program; see the file COPYING. If not, write to
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;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Code:
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(define-module (language scheme translate)
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#:use-module (system base pmatch)
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#:use-module (system base language)
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#:use-module (system il ghil)
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#:use-module (system il inline)
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#:use-module (ice-9 receive)
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#:use-module ((ice-9 syncase) #:select (sc-macro))
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#:use-module ((system base compile) #:select (syntax-error))
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#:export (translate))
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(define (translate x e)
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(call-with-ghil-environment (make-ghil-toplevel-env) '()
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(lambda (env vars)
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(make-ghil-lambda env #f vars #f '() (trans env (location x) x)))))
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;;;
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;;; Translator
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;;;
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(define *forbidden-primitives*
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;; Guile's `procedure->macro' family is evil because it crosses the
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;; compilation boundary. One solution might be to evaluate calls to
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;; `procedure->memoizing-macro' at compilation time, but it may be more
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;; compicated than that.
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'(procedure->syntax procedure->macro))
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;; Looks up transformers relative to the current module at
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;; compilation-time. See also the discussion of ghil-lookup in ghil.scm.
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(define (lookup-transformer head retrans)
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(let* ((mod (current-module))
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(val (and (symbol? head)
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(and=> (module-variable mod head)
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(lambda (var)
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;; unbound vars can happen if the module
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;; definition forward-declared them
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(and (variable-bound? var) (variable-ref var)))))))
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(cond
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((assq-ref custom-transformer-table val))
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((defmacro? val)
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(lambda (env loc exp)
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(retrans (apply (defmacro-transformer val) (cdr exp)))))
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((eq? val sc-macro)
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;; syncase!
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(let* ((the-syncase-module (resolve-module '(ice-9 syncase)))
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(eec (module-ref the-syncase-module 'expansion-eval-closure))
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(sc-expand3 (module-ref the-syncase-module 'sc-expand3)))
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(lambda (env loc exp)
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(retrans
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(with-fluids ((eec (module-eval-closure mod)))
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(sc-expand3 exp 'c '(compile load eval)))))))
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((primitive-macro? val)
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(syntax-error #f "unhandled primitive macro" head))
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((macro? val)
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(syntax-error #f "unknown kind of macro" head))
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(else #f))))
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(define (trans e l x)
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(define (retrans x) (trans e (location x) x))
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(cond ((pair? x)
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(let ((head (car x)) (tail (cdr x)))
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(cond
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((lookup-transformer head retrans)
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=> (lambda (t) (t e l x)))
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;; FIXME: lexical/module overrides of forbidden primitives
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((memq head *forbidden-primitives*)
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(syntax-error l (format #f "`~a' is forbidden" head)
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(cons head tail)))
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(else
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(let ((tail (map retrans tail)))
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(or (and (symbol? head)
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(try-inline-with-env e l (cons head tail)))
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(make-ghil-call e l (retrans head) tail)))))))
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((symbol? x)
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(make-ghil-ref e l (ghil-lookup e x)))
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;; fixme: non-self-quoting objects like #<foo>
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(else
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(make-ghil-quote e l #:obj x))))
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(define (valid-bindings? bindings . it-is-for-do)
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(define (valid-binding? b)
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(pmatch b
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((,sym ,var) (guard (symbol? sym)) #t)
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((,sym ,var ,update) (guard (pair? it-is-for-do) (symbol? sym)) #t)
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(else #f)))
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(and (list? bindings) (and-map valid-binding? bindings)))
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(define-macro (make-pmatch-transformers env loc retranslate . body)
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(define exp (gensym))
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(define (make1 clause)
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(let ((sym (car clause))
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(clauses (cdr clause)))
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`(cons ,sym
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(lambda (,env ,loc ,exp)
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(define (,retranslate x) (trans ,env (location x) x))
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(pmatch (cdr ,exp)
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,@clauses
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(else (syntax-error ,loc (format #f "bad ~A" ',sym) ,exp)))))))
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`(list ,@(map make1 body)))
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(define *the-compile-toplevel-symbol* 'compile-toplevel)
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(define custom-transformer-table
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(make-pmatch-transformers
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e l retrans
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(quote
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;; (quote OBJ)
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((,obj) (make-ghil-quote e l obj)))
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(quasiquote
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;; (quasiquote OBJ)
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((,obj) (make-ghil-quasiquote e l (trans-quasiquote e l obj 0))))
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(define
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;; (define NAME VAL)
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((,name ,val) (guard (symbol? name)
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(ghil-toplevel-env? (ghil-env-parent e)))
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(make-ghil-define e l (ghil-define (ghil-env-parent e) name)
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(maybe-name-value! (retrans val) name)))
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;; (define (NAME FORMALS...) BODY...)
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(((,name . ,formals) . ,body) (guard (symbol? name))
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;; -> (define NAME (lambda FORMALS BODY...))
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(retrans `(define ,name (lambda ,formals ,@body)))))
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(set!
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;; (set! NAME VAL)
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((,name ,val) (guard (symbol? name))
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(make-ghil-set e l (ghil-lookup e name) (retrans val)))
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;; (set! (NAME ARGS...) VAL)
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(((,name . ,args) ,val) (guard (symbol? name))
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;; -> ((setter NAME) ARGS... VAL)
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(retrans `((setter ,name) . (,@args ,val)))))
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(if
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;; (if TEST THEN [ELSE])
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((,test ,then)
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(make-ghil-if e l (retrans test) (retrans then) (retrans '(begin))))
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((,test ,then ,else)
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(make-ghil-if e l (retrans test) (retrans then) (retrans else))))
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(and
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;; (and EXPS...)
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(,tail (make-ghil-and e l (map retrans tail))))
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(or
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;; (or EXPS...)
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(,tail (make-ghil-or e l (map retrans tail))))
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(begin
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;; (begin EXPS...)
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(,tail (make-ghil-begin e l (map retrans tail))))
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(let
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;; (let NAME ((SYM VAL) ...) BODY...)
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((,name ,bindings . ,body) (guard (symbol? name)
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(valid-bindings? bindings))
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;; -> (letrec ((NAME (lambda (SYM...) BODY...))) (NAME VAL...))
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(retrans `(letrec ((,name (lambda ,(map car bindings) ,@body)))
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(,name ,@(map cadr bindings)))))
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;; (let () BODY...)
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((() . ,body)
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;; Note: this differs from `begin'
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(make-ghil-begin e l (list (trans-body e l body))))
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;; (let ((SYM VAL) ...) BODY...)
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((,bindings . ,body) (guard (valid-bindings? bindings))
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(let ((vals (map retrans (map cadr bindings))))
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(call-with-ghil-bindings e (map car bindings)
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(lambda (vars)
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(make-ghil-bind e l vars vals (trans-body e l body)))))))
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(let*
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;; (let* ((SYM VAL) ...) BODY...)
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((() . ,body)
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(retrans `(let () ,@body)))
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((((,sym ,val) . ,rest) . ,body) (guard (symbol? sym))
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(retrans `(let ((,sym ,val)) (let* ,rest ,@body)))))
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(letrec
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;; (letrec ((SYM VAL) ...) BODY...)
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((,bindings . ,body) (guard (valid-bindings? bindings))
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(call-with-ghil-bindings e (map car bindings)
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(lambda (vars)
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(let ((vals (map retrans (map cadr bindings))))
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(make-ghil-bind e l vars vals (trans-body e l body)))))))
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(cond
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;; (cond (CLAUSE BODY...) ...)
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(() (retrans '(begin)))
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(((else . ,body)) (retrans `(begin ,@body)))
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(((,test) . ,rest) (retrans `(or ,test (cond ,@rest))))
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(((,test => ,proc) . ,rest)
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;; FIXME hygiene!
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(retrans `(let ((_t ,test)) (if _t (,proc _t) (cond ,@rest)))))
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(((,test . ,body) . ,rest)
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(retrans `(if ,test (begin ,@body) (cond ,@rest)))))
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(case
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;; (case EXP ((KEY...) BODY...) ...)
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((,exp . ,clauses)
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(retrans
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;; FIXME hygiene!
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`(let ((_t ,exp))
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,(let loop ((ls clauses))
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(cond ((null? ls) '(begin))
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((eq? (caar ls) 'else) `(begin ,@(cdar ls)))
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(else `(if (memv _t ',(caar ls))
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(begin ,@(cdar ls))
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,(loop (cdr ls))))))))))
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(do
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;; (do ((SYM VAL [UPDATE]) ...) (TEST RESULT...) BODY...)
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((,bindings (,test . ,result) . ,body)
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(let ((sym (map car bindings))
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(val (map cadr bindings))
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(update (map cddr bindings)))
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(define (next s x) (if (pair? x) (car x) s))
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(retrans
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;; FIXME hygiene!
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`(letrec ((_l (lambda ,sym
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(if ,test
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(begin ,@result)
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(begin ,@body
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(_l ,@(map next sym update)))))))
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(_l ,@val))))))
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(lambda
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;; (lambda FORMALS BODY...)
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((,formals . ,body)
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(receive (syms rest) (parse-formals formals)
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(call-with-ghil-environment e syms
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(lambda (env vars)
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(receive (meta body) (parse-lambda-meta body)
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(make-ghil-lambda env l vars rest meta
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(trans-body env l body))))))))
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;; FIXME not hygienic
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(delay
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((,expr)
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(retrans `(make-promise (lambda () ,expr)))))
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(eval-case
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(,clauses
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(retrans
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`(begin
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;; Compilation of toplevel units is always wrapped in a lambda
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,@(let ((toplevel? (ghil-toplevel-env? (ghil-env-parent e))))
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(let loop ((seen '()) (in clauses) (runtime '()))
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(cond
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((null? in) runtime)
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(else
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(pmatch (car in)
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((else . ,body)
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(if (and toplevel? (not (memq *the-compile-toplevel-symbol* seen)))
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(primitive-eval `(begin ,@body)))
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(if (memq (if toplevel? *the-compile-toplevel-symbol* 'evaluate) seen)
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runtime
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body))
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((,keys . ,body) (guard (list? keys) (and-map symbol? keys))
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(for-each (lambda (k)
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(if (memq k seen)
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(syntax-error l "eval-case condition seen twice" k)))
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keys)
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(if (and toplevel? (memq *the-compile-toplevel-symbol* keys))
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(primitive-eval `(begin ,@body)))
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(loop (append keys seen)
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(cdr in)
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(if (memq (if toplevel? 'load-toplevel 'evaluate) keys)
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(append runtime body)
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runtime)))
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(else (syntax-error l "bad eval-case clause" (car in))))))))))))
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;; FIXME: not hygienic, relies on @apply not being shadowed
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(apply
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(,args (retrans `(@apply ,@args))))
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(@apply
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((,proc ,arg1 . ,args)
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(let ((args (cons (retrans arg1) (map retrans args))))
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(cond ((and (symbol? proc)
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(not (ghil-lookup e proc #f))
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(and=> (module-variable (current-module) proc)
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(lambda (var)
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(and (variable-bound? var)
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(lookup-apply-transformer (variable-ref var))))))
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;; that is, a variable, not part of this compilation
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;; unit, but defined in the toplevel environment, and has
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;; an apply transformer registered
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=> (lambda (t) (t e l args)))
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(else (make-ghil-inline e l 'apply
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(cons (retrans proc) args)))))))
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;; FIXME: not hygienic, relies on @call-with-values not being shadowed
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(call-with-values
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((,producer ,consumer)
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(retrans `(@call-with-values ,producer ,consumer)))
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(else #f))
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(@call-with-values
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((,producer ,consumer)
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(make-ghil-mv-call e l (retrans producer) (retrans consumer))))
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;; FIXME: not hygienic, relies on @call-with-current-continuation
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;; not being shadowed
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(call-with-current-continuation
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((,proc)
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(retrans `(@call-with-current-continuation ,proc)))
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(else #f))
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(@call-with-current-continuation
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((,proc)
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(make-ghil-inline e l 'call/cc (list (retrans proc)))))
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(receive
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((,formals ,producer-exp . ,body)
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;; Lovely, self-referential usage. Not strictly necessary, the
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;; macro would do the trick; but it's good to test the mv-bind
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;; code.
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(receive (syms rest) (parse-formals formals)
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(call-with-ghil-bindings e syms
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(lambda (vars)
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(make-ghil-mv-bind e l (retrans `(lambda () ,producer-exp))
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vars rest (trans-body e l body)))))))
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(values
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((,x) (retrans x))
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(,args (make-ghil-values e l (map retrans args))))))
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(define (lookup-apply-transformer proc)
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(cond ((eq? proc values)
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(lambda (e l args)
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(make-ghil-values* e l args)))
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(else #f)))
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(define (trans-quasiquote e l x level)
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(cond ((not (pair? x)) x)
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((memq (car x) '(unquote unquote-splicing))
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(let ((l (location x)))
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(pmatch (cdr x)
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((,obj)
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(cond
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((zero? level)
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(if (eq? (car x) 'unquote)
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(make-ghil-unquote e l (trans e l obj))
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(make-ghil-unquote-splicing e l (trans e l obj))))
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(else
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(list (car x) (trans-quasiquote e l obj (1- level))))))
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(else (syntax-error l (format #f "bad ~A" (car x)) x)))))
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((eq? (car x) 'quasiquote)
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(let ((l (location x)))
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(pmatch (cdr x)
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((,obj) (list 'quasiquote (trans-quasiquote e l obj (1+ level))))
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(else (syntax-error l (format #f "bad ~A" (car x)) x)))))
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(else (cons (trans-quasiquote e l (car x) level)
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(trans-quasiquote e l (cdr x) level)))))
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(define (trans-body e l body)
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(define (define->binding df)
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(pmatch (cdr df)
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((,name ,val) (guard (symbol? name)) (list name val))
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(((,name . ,formals) . ,body) (guard (symbol? name))
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(list name `(lambda ,formals ,@body)))
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(else (syntax-error (location df) "bad define" df))))
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;; main
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(let loop ((ls body) (ds '()))
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(pmatch ls
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(() (syntax-error l "bad body" body))
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(((define . _) . _)
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(loop (cdr ls) (cons (car ls) ds)))
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(else
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(if (null? ds)
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(trans e l `(begin ,@ls))
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(trans e l `(letrec ,(map define->binding ds) ,@ls)))))))
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(define (parse-formals formals)
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(cond
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;; (lambda x ...)
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((symbol? formals) (values (list formals) #t))
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;; (lambda (x y z) ...)
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((list? formals) (values formals #f))
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;; (lambda (x y . z) ...)
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((pair? formals)
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(let loop ((l formals) (v '()))
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(if (pair? l)
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(loop (cdr l) (cons (car l) v))
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(values (reverse! (cons l v)) #t))))
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(else (syntax-error (location formals) "bad formals" formals))))
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(define (parse-lambda-meta body)
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(cond ((or (null? body) (null? (cdr body))) (values '() body))
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((string? (car body))
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(values `((documentation . ,(car body))) (cdr body)))
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(else (values '() body))))
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(define (maybe-name-value! val name)
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(cond
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((ghil-lambda? val)
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(if (not (assq-ref (ghil-lambda-meta val) 'name))
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(set! (ghil-lambda-meta val)
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(acons 'name name (ghil-lambda-meta val))))))
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val)
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(define (location x)
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(and (pair? x)
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(let ((props (source-properties x)))
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(and (not (null? props))
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(vector (assq-ref props 'line)
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(assq-ref props 'column)
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(assq-ref props 'filename))))))
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