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(define-module (c cpp)
:use-module (hnh util)
:use-module (srfi srfi-1)
:use-module (ice-9 popen)
:use-module (ice-9 match)
:use-module (ice-9 regex)
:use-module ((rnrs io ports) :select (call-with-port))
:use-module ((rnrs bytevectors) :select (bytevector?))
:use-module (ice-9 format)
:use-module ((hnh util io) :select (read-lines))
:use-module (hnh util graph)
:use-module (c lex)
:use-module (c parse)
:use-module (c operators)
:export (replace-symbols include#)
)
;; input "#define F(x, y) x + y"
;; 1 full define | F(x,y)
;; 2 macro name | F
;; 3 macro args | (x,y)
;; 5 macro body | x + y or #f
(define define-re (make-regexp "^#define ((\\w+)([(][^)]*[)])?)( (.*))?"))
(define (tokenize-define-line header-line)
(aif (regexp-exec define-re header-line)
(cons (match:substring it 1)
(let ((body (match:substring it 5)))
(if (or (eqv? body #f)
(string-null? body))
"1" body)))
(scm-error 'c-parse-error
"tokenize-define-line"
"Line dosen't match: ~s"
(list header-line) #f)))
(define (replace-symbols tree dict)
(if (not (list? tree))
(or (assoc-ref dict tree) tree)
(map (lambda (node) (replace-symbols node dict))
tree)))
;; Direct values. Lisp also has quoted symbols in this group.
(define (immediate? x)
(or (number? x)
(bytevector? x)))
;; TODO replace this with something sensible
;; like a correct list extracted from (c eval)
;; and not thinging that types are variables
;; built in symbols. Should never be marked as dependencies
(define (primitive? x)
(memv x `(
;; language primitives
sizeof
;; special forms introduced by parser
funcall ternary struct-type as-type
;; unary operatons which aren't also binary operators
++ -- ! ~
not compl dereference pointer
pre-increment pre-decrement
post-increment post-decrement
,@binary-operators
)))
;; (symbol . value) -> (list (dependencies . symbol . value)
(define (parse-cpp-define pair)
(define f (compose parse-lexeme-tree lex))
(define left (f (car pair)))
(define proc-args
(match (and (pair? left)
(eq? 'funcall (car left))
(caddr left))
[#f '()]
[(_ args ...) args]
[arg (list arg)]))
(define right (f (cdr pair)))
(define dependencies
(lset-difference
eq?
(remove primitive?
(remove immediate?
(flatten (if (list? right)
right (list right)))))
proc-args))
(cons
dependencies
(match left
[('funcall name ('#{,}# args ...))
(cons name `(lambda ,args ,right))]
[('funcall name arg)
(cons name `(lambda (,arg) ,right))]
[name (cons name right)])))
(define (parse-cpp-file lines)
(map (lambda (line)
(catch #t
(lambda () (parse-cpp-define line))
(lambda (err caller fmt args data)
(format #t "~a in ~a: ~?~%"
err caller fmt args)
(format #t "~s~%" line)
#f)))
lines))
(define (private-c-symbol? string)
(char=? #\_ (string-ref string 0)))
(define (tokenize-header-file header-file)
(map tokenize-define-line
(call-with-port
(open-pipe* OPEN_READ "cpp" "-dM" header-file)
read-lines)))
(define (load-cpp-file header-file)
(define lines (tokenize-header-file header-file))
(define forms (parse-cpp-file lines))
(fold (lambda (node graph)
(add-node graph (cdr node) (car node)))
(make-graph car)
(filter identity forms)))
(define (include% header-file)
(define graph* (load-cpp-file header-file))
;; Hack for termios since this symbol isn't defined.
;; (including in the above removed private c symbols)
(define graph (add-node graph* (cons '_POSIX_VDISABLE 0) '()))
;; TODO expand bodies
;; (remove (compose private-c-symbol? car))
(resolve-dependency-graph graph))
(define-macro (include# header-file . args)
(define define-form (if (null? args) 'define (car args)))
`(begin
,@(map (lambda (pair) `(,define-form ,(car pair) ,(cdr pair)))
(include% header-file))))
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