/usr/share/racket/collects/syntax/modcode.rkt is in racket-common 6.7-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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(require racket/contract/base
racket/list
racket/path
"modread.rkt")
(provide moddep-current-open-input-file
exn:get-module-code
exn:get-module-code?
exn:get-module-code-path
make-exn:get-module-code)
(provide/contract
[get-module-code
(->* (path-string?)
(#:roots (listof (or/c path-string? 'same))
#:submodule-path (listof symbol?)
#:sub-path (and/c path-string? relative-path?)
(and/c path-string? relative-path?)
#:compile (-> any/c any)
(-> any/c any)
#:extension-handler (or/c false/c (path? boolean? . -> . any))
(or/c false/c (path? boolean? . -> . any))
#:choose (path? path? path? . -> . (or/c 'src 'zo 'so #f))
#:notify (any/c . -> . any)
#:source-reader (any/c input-port? . -> . (or/c syntax? eof-object?))
#:rkt-try-ss? boolean?)
any)]
[get-module-path
(->* (path-string?)
(#:roots (listof (or/c path-string? 'same))
#:submodule? boolean?
#:sub-path (and/c path-string? relative-path?)
(and/c path-string? relative-path?)
#:choose (path? path? path? . -> . (or/c 'src 'zo 'so #f))
#:rkt-try-ss? boolean?)
(values path? (or/c 'src 'zo 'so)))]
[get-metadata-path
(->* (path-string?)
(#:roots (listof (or/c path-string? 'same)))
#:rest (listof (or/c path-string? 'same))
path?)])
(define moddep-current-open-input-file
(make-parameter open-input-file))
(define (resolve s)
(if (complete-path? s)
s
(let ([d (current-load-relative-directory)])
(if d (path->complete-path s d) s))))
(define (date>=? a bm)
(and a
(let ([am (with-handlers ([exn:fail:filesystem? (lambda (x) #f)])
(file-or-directory-modify-seconds a))])
(and am (if bm (>= am bm) #t)))))
(define (read-one orig-path path src? read-src-syntax)
(define p ((moddep-current-open-input-file) path))
(when src? (port-count-lines! p))
(define (reader)
(define-values (base name dir?) (split-path orig-path))
(define unchecked-v
(with-module-reading-parameterization
(lambda ()
;; In case we're reading a .zo, we need to set
;; the load-relative directory for unmarshaling
;; path literals.
(parameterize ([current-load-relative-directory
(if (path? base) base (current-directory))])
(read-src-syntax path p)))))
(when (eof-object? unchecked-v)
(error 'read-one "empty file; expected a module declaration in: ~a" path))
(define sym
(string->symbol
(bytes->string/utf-8 (path->bytes (path-replace-extension name #"")) #\?)))
(define checked-v (check-module-form unchecked-v sym path))
(unless (eof-object? (read p))
(error 'read-one
"file has more than one expression; expected a module declaration only in: ~a"
path))
(if (and (syntax? checked-v) (compiled-expression? (syntax-e checked-v)))
(syntax-e checked-v)
checked-v))
(define (closer) (close-input-port p))
(dynamic-wind void reader closer))
(define-struct (exn:get-module-code exn:fail) (path))
(define (reroot-path* base root)
(cond
[(eq? root 'same) base]
[(relative-path? root) (build-path base root)]
[else (reroot-path base root)]))
;; : (or/c path-string? 'same) -> (or/c path? 'same)
(define (path-string->path ps)
(if (string? ps) (string->path ps) ps))
;; : (listof (or/c path-string? 'same)) -> (listof (or/c path? 'same))
(define (root-strs->roots root-strs)
(map path-string->path root-strs))
(define (get-metadata-path
#:roots [root-strs (current-compiled-file-roots)]
base-str . arg-strs)
(define base (path-string->path base-str))
(define roots (root-strs->roots root-strs))
(define args (root-strs->roots arg-strs))
(cond
[(or (equal? roots '(same)) (null? roots))
(apply build-path base args)]
[else
(or (for/or ([root (in-list (if (null? (cdr roots)) null roots))])
(define p (apply build-path (reroot-path* base root) args))
(and (file-exists? p) p))
(apply build-path (reroot-path* base (car roots)) args))]))
(define (get-module-path
path0-str
#:roots [root-strs (current-compiled-file-roots)]
#:submodule? [submodule? #f]
#:sub-path [sub-path/kw "compiled"]
[sub-path sub-path/kw]
#:choose [choose (lambda (src zo so) #f)]
#:rkt-try-ss? [rkt-try-ss? #t])
(define path0 (path-string->path path0-str))
(define roots (root-strs->roots root-strs))
(define resolved-path (resolve path0))
(define-values (path0-rel path0-file path0-dir?) (split-path path0))
(define-values (main-src-file alt-src-file)
(if rkt-try-ss?
(let* ([b (path->bytes path0-file)]
[len (bytes-length b)])
(cond
[(and (len . >= . 4) (bytes=? #".rkt" (subbytes b (- len 4))))
;; .rkt => try .rkt then .ss
(values path0-file
(bytes->path (bytes-append (subbytes b 0 (- len 4))
#".ss")))]
[else
;; No search path
(values path0-file #f)]))
(values path0-file #f)))
(define main-src-path
(if (eq? main-src-file path0-file)
resolved-path
(build-path path0-rel main-src-file)))
(define alt-src-path
(and alt-src-file
(if (eq? alt-src-file path0-file)
resolved-path
(build-path path0-rel alt-src-file))))
(define path0-base (if (eq? path0-rel 'relative) 'same path0-rel))
(define main-src-date
(file-or-directory-modify-seconds main-src-path #f (lambda () #f)))
(define alt-src-date
(and alt-src-path
(not main-src-date)
(file-or-directory-modify-seconds alt-src-path #f (lambda () #f))))
(define src-date (or main-src-date alt-src-date))
(define src-file (if alt-src-date alt-src-file main-src-file))
(define src-path (if alt-src-date alt-src-path main-src-path))
(define try-alt? (and alt-src-file (not alt-src-date) (not main-src-date)))
(define (get-so file)
(get-metadata-path #:roots roots
path0-base
sub-path
"native"
(system-library-subpath)
(path-add-extension file (system-type 'so-suffix))))
(define zo
(get-metadata-path #:roots roots
path0-base
sub-path
(path-add-extension src-file #".zo")))
(define alt-zo
(and try-alt?
(get-metadata-path #:roots roots
path0-base
sub-path
(path-add-extension alt-src-file #".zo"))))
(define so (get-so src-file))
(define alt-so (and try-alt? (get-so alt-src-file)))
(define prefer (choose src-path zo so))
(cond
;; Use .zo, if it's new enough
[(or (eq? prefer 'zo)
(and (not prefer)
(pair? roots)
(or (date>=? zo src-date)
(and try-alt?
(date>=? alt-zo src-date)))))
(let ([zo (if (date>=? zo src-date)
zo
(if (and try-alt? (date>=? alt-zo src-date))
alt-zo
zo))])
(values (simple-form-path zo) 'zo))]
;; Maybe there's an .so? Use it only if we don't prefer source
;; and only if there's no submodule path.
[(and (not submodule?)
(or (eq? prefer 'so)
(and (not prefer)
(pair? roots)
(or (date>=? so src-date)
(and try-alt?
(date>=? alt-so src-date))))))
(let ([so (if (date>=? so src-date)
so
(if (and try-alt? (date>=? alt-so src-date))
alt-so
so))])
(values (simple-form-path so) 'so))]
;; Use source if it exists
[(or (eq? prefer 'src) src-date)
(values (simple-form-path src-path) 'src)]
;; Report a not-there error
[else (raise (make-exn:get-module-code
(format "get-module-code: no such file: ~e" resolved-path)
(current-continuation-marks)
#f))]))
(define (get-module-code
path0-str
#:roots [root-strs (current-compiled-file-roots)]
#:submodule-path [submodule-path '()]
#:sub-path [sub-path/kw "compiled"]
[sub-path sub-path/kw]
#:compile [compile/kw compile]
[compiler compile/kw]
#:extension-handler [ext-handler/kw #f]
[ext-handler ext-handler/kw]
#:choose [choose (lambda (src zo so) #f)]
#:notify [notify void]
#:source-reader [read-src-syntax read-syntax]
#:rkt-try-ss? [rkt-try-ss? #t])
(define path0 (path-string->path path0-str))
(define roots (root-strs->roots root-strs))
(define-values (path type)
(get-module-path
path0
#:roots roots
#:submodule? (pair? submodule-path)
#:sub-path sub-path
#:choose choose
#:rkt-try-ss? rkt-try-ss?))
(define (extract-submodule m [sm-path submodule-path])
(cond
[(null? sm-path) m]
[else
(extract-submodule
(or (for/or ([c (in-list (append (module-compiled-submodules m #t)
(module-compiled-submodules m #f)))])
(and (eq? (last (module-compiled-name c)) (car sm-path))
c))
(raise
(make-exn:get-module-code
(format "get-module-code: cannot find submodule: ~e" sm-path)
(current-continuation-marks)
#f)))
(cdr sm-path))]))
(case type
[(zo)
(notify path)
(extract-submodule (read-one path0 path #f read-syntax))]
[(so)
(if ext-handler
(begin
(notify path)
(ext-handler path #f))
(raise (make-exn:get-module-code
(format "get-module-code: cannot use extension file; ~e" path)
(current-continuation-marks)
path)))]
[(src)
(notify path)
(define (compile-one)
(define-values (path0-base path0-name path0-dir?) (split-path path0))
(parameterize ([current-load-relative-directory
(if (path? path0-base) path0-base (current-directory))])
(compiler (read-one path0 path #t read-src-syntax))))
(if (null? submodule-path)
;; allow any result:
(compile-one)
;; expect a compiled-module result:
(extract-submodule (compile-one)))]))
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