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(define-library (csc ir2)
(export
atom-continuation
atom-expression
atom?
ir2=?
kargs-expression
kargs-refs
kargs?
ktail?
make-atom
make-kargs
make-ktail
make-update
update-atom
update-continuation
update-ref
; Re-exports from IR1.
constant-expression
constant?
lexical-ref-gensym
lexical-ref-name
lexical-ref?
library-ref-library
library-ref-name
library-ref?
make-constant
make-lexical-ref
lexical-set-expression
lexical-set-ref
lexical-set?
make-lexical-set
make-library-ref)
(import (scheme base)
(only (csc ir1)
constant?
ir1=?
lexical-ref-gensym
lexical-ref-name
lexical-ref?
lexical-set-expression
lexical-set-ref
lexical-set?
library-ref-library
library-ref-name
library-ref?
make-constant
make-lexical-ref
make-lexical-set
make-library-ref)
(only (csc loop)
loop
return))
(begin
; This library defines the intermediate representation IR2.
; It's CPS time bitch.
; CPS atom:
; An atom is a value that can be computed immediately without
; any subexpressions.
; Atoms consist of
; - constant,
; - lexical-ref,
; - or library-ref
; CPS expressions:
; CPS expressions are similar to IR1 expressions,
; but constrained not to have any subexpressions except atoms.
; And they take a continuation.
; CPS continuations
; There are a few continuations.
; Continuations are identified by an integer ID into the
; continuation map.
; Guile calls this map the "continuation soup".
; CPS expressions.
; An atom consists of an atom and a continuation.
(define-record-type <atom>
(make-atom expression continuation)
atom?
(expression atom-expression)
(continuation atom-continuation))
; Modifies a library or lexically bound variable to the given atom.
(define-record-type <update>
(make-update ref atom continuation)
update?
(ref update-ref)
(atom update-atom)
(continuation update-continuation))
; CPS continuations.
; The tail continuation.
(define-record-type <ktail>
(make-ktail)
ktail?)
; Binds the incoming values to the given lexically-bound variables
; and then evaluates expression.
(define-record-type <kargs>
(make-kargs refs expression)
kargs?
(refs kargs-refs)
(expression kargs-expression))
(define (ir2=?-sametype x y)
(cond
((and (atom? x) (atom? y))
(and (ir1=? (atom-expression x) (atom-expression y))
(= (atom-continuation x) (atom-continuation y))))
((and (update? x) (update? y))
(and (ir1=? (update-ref x) (update-ref y))
(ir1=? (update-atom x) (update-atom y))
(= (update-continuation x) (update-continuation y))))
((and (ktail? x) (ktail? y)) #t)
((and (kargs? x) (kargs? y))
(let ((x-refs (kargs-refs x))
(y-refs (kargs-refs y)))
(and (= (length x-refs) (length y-refs))
(loop for x-ref in x-refs
for y-ref in y-refs
unless (ir1=? x-ref y-ref)
return #f
finally (return #t))
(ir2=? (kargs-expression x) (kargs-expression y)))))
(else #f)))
(define (ir2=? x y)
(cond
((ir2=?-sametype x y) #t)
((and (ir2=?-sametype x x) (ir2=?-sametype y y))
#f)
(else (error "One or more arguments has a type unknown to ir2=?" x y))))))
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