mirror of
https://git.savannah.gnu.org/git/guile.git
synced 2025-05-16 18:50:23 +02:00
a222b0fa91
* libguile/vm-engine.c (vm_run): The bootstrap program now uses mv_call, so as to allow multiple values out of the VM. (It did before, because multiple values were represented internally as single scm_values objects, but now that values go on the stack, we need to note the boot frame as accepting multiple values.) (vm_error_no_values): New error, happens if you pass no values into a single-value continuation. Passing more than one is OK though, it just takes the first one. * libguile/vm-i-system.c (halt): Assume that someone has pushed the number of values onto the stack, and package up that number of values as a scm_values() object, for communication with the interpreter. (mv-call): New instruction, calls a procedure with a multiple-value continuation, even handling calls out to the interpreter. (return/values): New instruction, returns multiple values to the continuation. If the continuation is single-valued, takes the first value or errors if there are no values. Otherwise it returns to the multiple-value return address, pushing the number of values on top of the values. * module/system/il/compile.scm (codegen): Compile <ghil-values> forms. * module/system/il/ghil.scm (<ghil-values>) Add new GHIL data structure and associated procedures. * module/language/scheme/translate.scm (custom-transformer-table): Compile (values .. ) forms into <ghil-values>.
357 lines
11 KiB
Scheme
357 lines
11 KiB
Scheme
;;; GHIL -> GLIL compiler
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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 (system il compile)
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#:use-syntax (system base syntax)
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#:use-module (system il glil)
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#:use-module (system il ghil)
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#:use-module (ice-9 common-list)
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#:export (compile))
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(define (compile x e . opts)
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(if (memq #:O opts) (set! x (optimize x)))
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(codegen x))
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;;;
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;;; Stage 2: Optimization
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;;;
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(define (optimize x)
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(record-case x
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((<ghil-set> env loc var val)
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(make-ghil-set env var (optimize val)))
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((<ghil-if> env loc test then else)
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(make-ghil-if env loc (optimize test) (optimize then) (optimize else)))
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((<ghil-begin> env loc exps)
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(make-ghil-begin env loc (map optimize exps)))
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((<ghil-bind> env loc vars vals body)
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(make-ghil-bind env loc vars (map optimize vals) (optimize body)))
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((<ghil-lambda> env loc vars rest meta body)
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(make-ghil-lambda env loc vars rest meta (optimize body)))
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((<ghil-inline> env loc instruction args)
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(make-ghil-inline env loc instruction (map optimize args)))
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((<ghil-call> env loc proc args)
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(let ((parent-env env))
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(record-case proc
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;; ((@lambda (VAR...) BODY...) ARG...) =>
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;; (@let ((VAR ARG) ...) BODY...)
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((<ghil-lambda> env loc vars rest meta body)
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(cond
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((not rest)
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(for-each (lambda (v)
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(case (ghil-var-kind v)
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((argument) (set! (ghil-var-kind v) 'local)))
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(set! (ghil-var-env v) parent-env)
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(ghil-env-add! parent-env v))
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(ghil-env-variables env)))
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(else
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(make-ghil-call parent-env loc (optimize proc) (map optimize args)))))
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(else
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(make-ghil-call parent-env loc (optimize proc) (map optimize args))))))
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(else x)))
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;;;
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;;; Stage 3: Code generation
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;;;
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(define *ia-void* (make-glil-void))
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(define *ia-drop* (make-glil-call 'drop 0))
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(define *ia-return* (make-glil-call 'return 0))
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(define (make-label) (gensym ":L"))
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(define (make-glil-var op env var)
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(case (ghil-var-kind var)
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((argument)
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(make-glil-argument op (ghil-var-index var)))
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((local)
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(make-glil-local op (ghil-var-index var)))
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((external)
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(do ((depth 0 (1+ depth))
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(e env (ghil-env-parent e)))
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((eq? e (ghil-var-env var))
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(make-glil-external op depth (ghil-var-index var)))))
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((module)
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(make-glil-module op (ghil-var-env var) (ghil-var-name var)))
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(else (error "Unknown kind of variable:" var))))
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(define (constant? x)
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(cond ((or (number? x) (string? x) (symbol? x) (keyword? x) (boolean? x)) #t)
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((pair? x) (and (constant? (car x))
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(constant? (cdr x))))
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((vector? x) (let lp ((i (vector-length x)))
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(or (zero? i)
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(and (constant? (vector-ref x (1- i)))
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(lp (1- i))))))))
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(define (codegen ghil)
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(let ((stack '()))
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(define (push-code! loc code)
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(set! stack (cons code stack))
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(if loc (set! stack (cons (make-glil-source loc) stack))))
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(define (push-bindings! loc vars)
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(if (not (null? vars))
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(push-code!
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loc
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(make-glil-bind
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(map list
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(map ghil-var-name vars)
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(map ghil-var-kind vars)
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(map ghil-var-index vars))))))
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(define (comp tree tail drop)
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(define (push-label! label)
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(push-code! #f (make-glil-label label)))
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(define (push-branch! loc inst label)
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(push-code! loc (make-glil-branch inst label)))
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(define (push-call! loc inst args)
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(for-each comp-push args)
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(push-code! loc (make-glil-call inst (length args))))
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;; possible tail position
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(define (comp-tail tree) (comp tree tail drop))
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;; push the result
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(define (comp-push tree) (comp tree #f #f))
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;; drop the result
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(define (comp-drop tree) (comp tree #f #t))
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;; drop the result if unnecessary
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(define (maybe-drop)
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(if drop (push-code! #f *ia-drop*)))
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;; return here if necessary
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(define (maybe-return)
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(if tail (push-code! #f *ia-return*)))
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;; return this code if necessary
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(define (return-code! loc code)
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(if (not drop) (push-code! loc code))
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(maybe-return))
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;; return void if necessary
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(define (return-void!)
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(return-code! #f *ia-void*))
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;; return object if necessary
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(define (return-object! loc obj)
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(return-code! loc (make-glil-const #:obj obj)))
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;;
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;; dispatch
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(record-case tree
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((<ghil-void>)
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(return-void!))
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((<ghil-quote> env loc obj)
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(return-object! loc obj))
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((<ghil-quasiquote> env loc exp)
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(let loop ((x exp))
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(cond
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((list? x)
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(push-call! #f 'mark '())
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(for-each loop x)
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(push-call! #f 'list-mark '()))
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((pair? x)
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(loop (car x))
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(loop (cdr x))
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(push-code! #f (make-glil-call 'cons 2)))
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((record? x)
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(record-case x
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((<ghil-unquote> env loc exp)
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(comp-push exp))
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((<ghil-unquote-splicing> env loc exp)
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(comp-push exp)
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(push-call! #f 'list-break '()))))
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((constant? x)
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(push-code! #f (make-glil-const #:obj x)))
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(else
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(error "element of quasiquote can't be compiled" x))))
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(maybe-drop)
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(maybe-return))
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((<ghil-ref> env loc var)
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(return-code! loc (make-glil-var 'ref env var)))
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((<ghil-set> env loc var val)
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(comp-push val)
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(push-code! loc (make-glil-var 'set env var))
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(return-void!))
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((<ghil-define> env loc var val)
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(comp-push val)
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(push-code! loc (make-glil-var 'define env var))
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(return-void!))
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((<ghil-if> env loc test then else)
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;; TEST
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;; (br-if-not L1)
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;; THEN
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;; (br L2)
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;; L1: ELSE
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;; L2:
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(let ((L1 (make-label)) (L2 (make-label)))
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(comp-push test)
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(push-branch! loc 'br-if-not L1)
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(comp-tail then)
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(if (not tail) (push-branch! #f 'br L2))
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(push-label! L1)
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(comp-tail else)
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(if (not tail) (push-label! L2))))
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((<ghil-and> env loc exps)
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;; EXP
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;; (br-if-not L1)
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;; ...
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;; TAIL
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;; (br L2)
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;; L1: (const #f)
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;; L2:
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(cond ((null? exps) (return-object! loc #t))
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((null? (cdr exps)) (comp-tail (car exps)))
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(else
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(let ((L1 (make-label)) (L2 (make-label)))
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(let lp ((exps exps))
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(cond ((null? (cdr exps))
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(comp-tail (car exps))
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(push-branch! #f 'br L2)
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(push-label! L1)
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(return-object! #f #f)
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(push-label! L2)
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(maybe-return))
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(else
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(comp-push (car exps))
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(push-branch! #f 'br-if-not L1)
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(lp (cdr exps)))))))))
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((<ghil-or> env loc exps)
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;; EXP
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;; (dup)
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;; (br-if L1)
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;; (drop)
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;; ...
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;; TAIL
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;; L1:
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(cond ((null? exps) (return-object! loc #f))
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((null? (cdr exps)) (comp-tail (car exps)))
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(else
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(let ((L1 (make-label)))
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(let lp ((exps exps))
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(cond ((null? (cdr exps))
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(comp-tail (car exps))
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(push-label! L1)
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(maybe-return))
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(else
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(comp-push (car exps))
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(if (not drop)
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(push-call! #f 'dup '()))
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(push-branch! #f 'br-if L1)
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(if (not drop)
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(push-call! #f 'drop '()))
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(lp (cdr exps)))))))))
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((<ghil-begin> env loc exps)
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;; EXPS...
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;; TAIL
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(if (null? exps)
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(return-void!)
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(do ((exps exps (cdr exps)))
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((null? (cdr exps))
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(comp-tail (car exps)))
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(comp-drop (car exps)))))
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((<ghil-bind> env loc vars vals body)
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;; VALS...
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;; (set VARS)...
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;; BODY
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(for-each comp-push vals)
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(push-bindings! loc vars)
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(for-each (lambda (var) (push-code! #f (make-glil-var 'set env var)))
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(reverse vars))
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(comp-tail body)
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(push-code! #f (make-glil-unbind)))
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((<ghil-lambda> env loc vars rest meta body)
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(return-code! loc (codegen tree)))
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((<ghil-inline> env loc inline args)
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;; ARGS...
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;; (INST NARGS)
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;; FIXME: translate between call and goto/args, etc
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(push-call! loc inline args)
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(maybe-drop)
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(maybe-return))
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((<ghil-values> env loc values)
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(cond (tail ;; (lambda () (values 1 2))
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(push-call! loc 'return/values values))
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(drop ;; (lambda () (values 1 2) 3)
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(for-each comp-drop values))
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(else ;; (lambda () (list (values 10 12) 1))
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(push-code! #f (make-glil-const #:obj 'values))
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(push-code! #f (make-glil-call #:inst 'link-now #:nargs 1))
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(push-code! #f (make-glil-call #:inst 'variable-ref #:nargs 0))
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(push-call! loc 'call values))))
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((<ghil-call> env loc proc args)
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;; PROC
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;; ARGS...
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;; ([tail-]call NARGS)
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(comp-push proc)
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(push-call! loc (if tail 'goto/args 'call) args)
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(maybe-drop))))
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;;
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;; main
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(record-case ghil
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((<ghil-lambda> env loc vars rest meta body)
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(let* ((evars (ghil-env-variables env))
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(locs (pick (lambda (v) (eq? (ghil-var-kind v) 'local)) evars))
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(exts (pick (lambda (v) (eq? (ghil-var-kind v) 'external)) evars)))
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;; initialize variable indexes
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(finalize-index! vars)
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(finalize-index! locs)
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(finalize-index! exts)
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;; meta bindings
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(push-bindings! #f vars)
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;; export arguments
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(do ((n 0 (1+ n))
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(l vars (cdr l)))
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((null? l))
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(let ((v (car l)))
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(case (ghil-var-kind v)
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((external)
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(push-code! #f (make-glil-argument 'ref n))
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(push-code! #f (make-glil-external 'set 0 (ghil-var-index v)))))))
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;; compile body
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(comp body #t #f)
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;; create GLIL
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(let ((vars (make-glil-vars #:nargs (length vars)
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#:nrest (if rest 1 0)
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#:nlocs (length locs)
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#:nexts (length exts))))
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(make-glil-asm vars meta (reverse! stack))))))))
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(define (finalize-index! list)
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(do ((n 0 (1+ n))
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(l list (cdr l)))
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((null? l))
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(let ((v (car l))) (set! (ghil-var-index v) n))))
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