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|
(define-library (csc ir2)
(export
%apply
%branch
%closure
%fix
%globals
%label
%primitive
%variable
*globals*
apply-arguments
apply-procedure
apply?
branch-atom
branch-false
branch-true
branch?
call-closure-args
call-closure-closure
call-closure?
closure-arguments
closure-body
closure-name
closure-rest
closure?
fix-body
fix-functions
fix?
globals?
label-gensym
label?
make-apply
make-branch
make-call-closure
make-closure
make-fix
make-label
make-primitive
make-variable
primitive-arguments
primitive-continuation
primitive-operation
primitive-results
primitive?
variable-gensym
variable?
; Re-exports from IR1.
%constant
%library-ref
constant-expression
constant?
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)
(import (scheme base)
(only (csc ir1)
%constant
%library-ref
constant-expression
constant?
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 list) all)
(only (csc loop)
loop
return)
(only (csc match)
define-match-record-type
match))
(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,
; - library-ref,
; - or globals.
; After closure conversion, there are no more lexical refs.
; Each lexical ref will be converted to a <variable>.
; A function argument or local variable.
(define-match-record-type <variable>
(make-variable gensym)
variable?
%variable
(gensym variable-gensym))
; The globals array. This will eventually be stored in register 0.
(define-match-record-type <globals>
(make-globals)
globals?
%globals)
; A global instance of <globals>.
; Considered equal to calling (make-globals).
(define *globals* (make-globals))
; A label, used for function names and will compile to a constant.
(define-match-record-type <label>
(make-label gensym)
label?
%label
(gensym label-gensym))
; CPS expressions:
; CPS expressions are similar to IR1 expressions,
; but constrained not to have any subexpressions except atoms.
; And they take a continuation.
; A primitive encodes one of a number of primitive operations.
; Each operation takes a number of arguments,
; and binds some number of result variables.
; The known primitives are listed below, along with their arity.
; - alloc: size -> result
; - peek: pointer * offset -> result
; - poke: word * pointer * offset -> ()
(define-match-record-type <primitive>
(make-primitive operation arguments results continuation)
primitive?
%primitive
(operation primitive-operation)
(arguments primitive-arguments)
(results primitive-results)
(continuation primitive-continuation))
; Branches depending on the given atom.
; If it is true, continue with continuation true.
; If false, continue with continuation false.
(define-match-record-type <branch>
(make-branch atom true false)
branch?
%branch
(atom branch-atom)
(true branch-true)
(false branch-false))
; Applies a procedure to a list of arguments. Apply does not take a
; continuation. Instead the continuation will be passed as the first
; argument to the function.
(define-match-record-type <apply>
(make-apply procedure arguments)
apply?
%apply
(procedure apply-procedure)
(arguments apply-arguments))
; A procedure. All closures are allocated in a fix expression. A closure
; does not take a continuation. Instead, the procedure will accept the
; continuation as an argument.
(define-match-record-type <closure>
(make-closure name arguments body)
closure?
%closure
(name closure-name)
(arguments closure-arguments)
(body closure-body))
; Defines a list of mutually recursive procedures.
; Functions is a list of closures, and body is an expression.
(define-match-record-type <fix>
(make-fix functions body)
fix?
%fix
(functions fix-functions)
(body fix-body))))
|
