452 lines
16 KiB
Scheme
452 lines
16 KiB
Scheme
;;; lang/c/cpp.scm
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;;;
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;;; Copyright (C) 2015-2017 Matthew R. Wette
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;;;
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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 3 of the License, or
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;;; (at your option) 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. If not, see <http://www.gnu.org/licenses/>.
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;; C preprocessor. This is not complete.
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(define-module (nyacc lang c99 cpp)
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#:export (parse-cpp-stmt
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cpp-line->stmt
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parse-cpp-expr
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eval-cpp-expr
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cpp-expand-text
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expand-cpp-macro-ref
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)
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#:use-module (nyacc parse)
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#:use-module (nyacc lex)
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#:use-module (nyacc lang util)
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#:use-module (rnrs arithmetic bitwise)
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#:use-module (ice-9 match)
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)
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(cond-expand
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(guile-2)
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(guile
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(use-modules (ice-9 syncase)))
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(mes))
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(define c99-std-defs
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'("__DATE__" "__FILE__" "__LINE__" "__STDC__" "__STDC_HOSTED__"
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"__STDC_VERSION__" "__TIME__"))
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(define (c99-std-def? str)
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(let iter ((defs c99-std-defs))
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(cond
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((null? defs) #f)
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((string=? (car defs) str) #t)
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(else (iter (cdr defs))))))
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(define (c99-std-val str)
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(cond
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((string=? str "__DATE__") "M01 01 2001")
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((string=? str "__FILE__") "(unknown)")
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((string=? str "__LINE__") 0)
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((string=? str "__STDC__") 1)
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((string=? str "__STDC_HOSTED__") 0)
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((string=? "__STDC_VERSION__") 201701)
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((string=? "__TIME__") "00:00:00")
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(else #f)))
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;; @deffn read-ellipsis ch
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;; read ellipsis
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(define (read-ellipsis ch)
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(cond
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((eof-object? ch) #f)
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((char=? ch #\.) (read-char) (read-char) "...") ; assumes correct syntax
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(else #f)))
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;; @deffn cpp-define => (define (name "ADD") (args "X" "Y") (repl "X+Y"))
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;; output is like
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;; @code{(name "ABC") (repl "123")} or
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;; @code{(name "ABC") (args "X" "Y") (repl "X+Y")}
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(define (cpp-define)
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(define (p-args la) ;; parse args
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(if (eq? la #\()
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(let iter ((args '()) (la (skip-il-ws (read-char))))
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(cond
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((eq? la #\)) (reverse args))
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((read-c-ident la) =>
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(lambda (arg)
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(iter (cons arg args) (skip-il-ws (read-char)))))
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((read-ellipsis la) =>
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(lambda (arg)
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(iter (cons arg args) (skip-il-ws (read-char)))))
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((eq? la #\,)
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(iter args (skip-il-ws (read-char))))))
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(begin (if (char? la) (unread-char la)) #f))) ;; CLEANUP
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(define (p-rest la) ;; parse rest
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(cond ((eof-object? la) "")
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(else
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(if (not (char=? #\=)) (unread-char la)) ; handle ABC=DEF
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(drain-input (current-input-port)))))
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(let* ((name (read-c-ident (skip-il-ws (read-char))))
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(args (or (p-args (read-char)) '()))
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(repl (p-rest (skip-il-ws (read-char)))))
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(if (pair? args)
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`(define (name ,name) (args ,args) (repl ,repl))
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`(define (name ,name) (repl ,repl)))))
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;; @deffn cpp-include
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;; Parse CPP include statement.
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(define (cpp-include)
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(let* ((beg-ch (skip-il-ws (read-char)))
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(end-ch (if (eq? beg-ch #\<) #\> #\"))
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(path (let iter ((cl (list beg-ch)) (ch (read-char)))
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(if (eq? ch end-ch) (list->string (reverse (cons ch cl)))
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(iter (cons ch cl) (read-char))))))
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`(include ,path)))
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;; @deffn cpp-line->stmt line defs => (stmt-type text)
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;; Parse a line from a CPP statement and return a parse tree.
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;; @example
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;; (parse-cpp-stmt "define X 123") => (define "X" "123")
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;; (parse-cpp-stmt "if defined(A) && defined(B) && defined(C)"
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;; => (if "defined(A) && defined(B) && defined(C)")
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;; @end example
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;; To evaluate the @code{if} statements use @code{parse-cpp-expr} and
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;; @code{eval-cpp-expr}.
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(define (cpp-line->stmt line)
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(define (rd-ident) (read-c-ident (skip-il-ws (read-char))))
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(define (rd-num) (and=> (read-c-num (skip-il-ws (read-char))) cdr))
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(define (rd-rest) (let ((ch (skip-il-ws (read-char))))
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(if (not (eof-object? ch)) (unread-char ch))
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(drain-input (current-input-port))))
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(with-input-from-string line
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(lambda ()
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(let ((cmd (string->symbol (read-c-ident (skip-il-ws (read-char))))))
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(case cmd
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((include) (cpp-include))
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((define) (cpp-define))
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((undef) `(undef ,(rd-ident)))
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((ifdef)
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`(if ,(string-append "defined(" (rd-ident) ")" (rd-rest))))
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((ifndef)
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`(if ,(string-append "!defined(" (rd-ident) ")" (rd-rest))))
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((if elif else endif line error pragma) (list cmd (rd-rest)))
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(else '(unknown "")))))))
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(include-from-path "nyacc/lang/c99/mach.d/cpptab.scm")
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(include-from-path "nyacc/lang/c99/mach.d/cppact.scm")
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(define raw-parser
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(make-lalr-parser
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(list (cons 'len-v len-v) (cons 'pat-v pat-v) (cons 'rto-v rto-v)
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(cons 'mtab mtab) (cons 'act-v act-v))))
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(define (cpp-err fmt . args)
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(apply throw 'cpp-error fmt args))
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;;.@deffn skip-il-ws ch
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;; Skip in-line whitespace
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(define skip-il-ws
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(let ((il-ws (list->char-set '(#\space #\tab))))
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(lambda (ch)
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(cond
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((eof-object? ch) ch)
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((char-set-contains? il-ws ch) (skip-il-ws (read-char)))
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(else ch)))))
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;; Since we want to be able to get CPP statements with comment in tact
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;; (e.g., for passing to @code{pretty-print-c99}) we need to remove
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;; comments when parsing CPP expressions. We convert a comm-reader
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;; into a comm-skipper here. And from that generate a lexer generator.
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(define cpp-comm-skipper
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(let ((reader (make-comm-reader '(("/*" . "*/")))))
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(lambda (ch)
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(reader ch #f))))
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;; generate a lexical analyzer per string
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(define gen-cpp-lexer
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(make-lexer-generator mtab #:comm-skipper cpp-comm-skipper))
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;; @deffn parse-cpp-expr text => tree
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;; Given a string returns a cpp parse tree. This is called by
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;; @code{eval-cpp-expr}. The text will have had all CPP defined symbols
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;; expanded already so no identifiers should appear in the text.
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;; A @code{cpp-error} will be thrown if a parse error occurs.
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(define (parse-cpp-expr text)
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(with-throw-handler
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'nyacc-error
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(lambda ()
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(with-input-from-string text
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(lambda () (raw-parser (gen-cpp-lexer)))))
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(lambda (key fmt . args)
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(apply throw 'cpp-error fmt args))))
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;; @deffn eval-cpp-expr tree dict => datum
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;; Evaluate a tree produced from @code{parse-cpp-expr}.
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;; The tree passed to this routine is
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(define (eval-cpp-expr tree dict)
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(letrec
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((tx (lambda (tr ix) (list-ref tr ix)))
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(tx1 (lambda (tr) (tx tr 1)))
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(ev (lambda (ex ix) (eval-expr (list-ref ex ix))))
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(ev1 (lambda (ex) (ev ex 1))) ; eval expr in arg 1
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(ev2 (lambda (ex) (ev ex 2))) ; eval expr in arg 2
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(ev3 (lambda (ex) (ev ex 3))) ; eval expr in arg 3
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(eval-expr
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(lambda (tree)
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(case (car tree)
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((fixed) (string->number (tx1 tree)))
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((char) (char->integer (tx1 tree)))
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((defined) (if (assoc-ref dict (tx1 tree)) 1 0))
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((pre-inc post-inc) (1+ (ev1 tree)))
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((pre-dec post-dec) (1- (ev1 tree)))
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((pos) (ev1 tree))
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((neg) (- (ev1 tree)))
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((bw-not) (bitwise-not (ev1 tree)))
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((not) (if (zero? (ev1 tree)) 1 0))
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((mul) (* (ev1 tree) (ev2 tree)))
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((div) (/ (ev1 tree) (ev2 tree)))
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((mod) (modulo (ev1 tree) (ev2 tree)))
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((add) (+ (ev1 tree) (ev2 tree)))
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((sub) (- (ev1 tree) (ev2 tree)))
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((lshift) (bitwise-arithmetic-shift-left (ev1 tree) (ev2 tree)))
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((rshift) (bitwise-arithmetic-shift-right (ev1 tree) (ev2 tree)))
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((lt) (if (< (ev1 tree) (ev2 tree)) 1 0))
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((le) (if (<= (ev1 tree) (ev2 tree)) 1 0))
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((gt) (if (> (ev1 tree) (ev2 tree)) 1 0))
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((ge) (if (>= (ev1 tree) (ev2 tree)) 1 0))
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((equal) (if (= (ev1 tree) (ev2 tree)) 1 0))
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((noteq) (if (= (ev1 tree) (ev2 tree)) 0 1))
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((bw-or) (bitwise-ior (ev1 tree) (ev2 tree)))
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((bw-xor) (bitwise-xor (ev1 tree) (ev2 tree)))
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((bw-and) (bitwise-and (ev1 tree) (ev2 tree)))
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((or) (if (and (zero? (ev1 tree)) (zero? (ev2 tree))) 0 1))
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((and) (if (or (zero? (ev1 tree)) (zero? (ev2 tree))) 0 1))
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((cond-expr) (if (zero? (ev1 tree)) (ev3 tree) (ev2 tree)))
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((ident) (cpp-err "undefined identifier: ~S" (cadr tree)))
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(else (error "incomplete implementation"))))))
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(eval-expr tree)))
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;; Note: scan-cpp-input scans replacement text. When identifiers are found
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;; they are tested for expansion as follows:
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;; @enumerate
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;; @item If already expanded, then ignore.
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;; @item If followed by @code{(}, then use @code{collect-args} to get the
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;; arguments and ...
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;; @item Otherwise insert the replacement text and continue scanning (at
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;; first character of new replacement text.
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;; @end enumerate
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;; @deffn rtokl->string tokl => string
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;; Convert reverse token-list to string.
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(define (rtokl->string tokl)
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;; need to cover: comm ident string arg
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;;(let iter ((stl '()) (chl '()) (nxt #f) (tkl tokl)) ;; more efficient
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(let iter ((stl '()) (tkl tokl))
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(match tkl
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('()
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(apply string-append stl))
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((('arg . arg) 'dhash (key . val) . rest)
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(iter (cons (string-append val arg) stl) (list-tail tkl 3)))
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(((key . val) 'dhash ('arg . arg) . rest)
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(iter (cons (string-append arg val) stl) (list-tail tkl 3)))
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((('arg . arg) 'hash . rest)
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(iter (cons (string-append "\"" arg "\"") stl) (list-tail tkl 2)))
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((('comm . val) . rest)
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(iter (cons (string-append "/*" val " */") stl) (cdr tkl)))
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((('ident . rval) ('ident . lval) . rest)
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(iter (cons* " " rval stl) (cdr tkl)))
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(((key . val) . rest)
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(iter (cons val stl) (cdr tkl)))
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(('space . rest)
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(iter (cons " " stl) rest))
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(((? char? ch) . rest)
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(iter (cons (string ch) stl) rest))
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(otherwise
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(error "no match" tkl)))))
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;; @deffn scan-cpp-input argd used dict end-tok => string
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;; Process replacement text from the input port and generate a (reversed)
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;; token-list. If end-tok, stop at, and push back, @code{,} or @code{)}.
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;; If end-tok is @code{,} then read until @code{,} or @code{(}.
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;; The argument @var{argd} is a dictionary (argument name, argument
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;; value) pairs which will be expanded as needed. This routine is called
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;; by collect-args, expand-cpp-repl and cpp-expand-text.
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(define (scan-cpp-input argd dict used end-tok)
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;; Works like this: scan for tokens (comments, parens, strings, char's, etc).
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;; Tokens are collected in a (reverse ordered) list (tkl) and merged together
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;; to a string on return using @code{rtokl->string}.
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;; Turn reverse chl into a string and insert it into the string list stl.
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(define (add-chl chl stl)
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(if (null? chl) stl (cons (list->string (reverse chl)) stl)))
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(define conjoin string-append)
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;; We just scanned "defined", now need to scan the arg to inhibit expansion.
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;; For example, we have scanned "defined"; we now scan "(FOO)" or "FOO", and
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;; return "defined(FOO)". We use ec (end-char) as terminal char:
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;; #\) if starts with #( or #\nul if other.
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(define (scan-defined-arg)
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(let* ((ch (skip-il-ws (read-char)))
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(ec (if (char=? ch #\() #\) #\null)))
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(let iter ((chl '(#\()) (ec ec) (ch (if (char=? ec #\)) (read-char) ch)))
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(cond
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((eof-object? ch)
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(if (char=? ec #\null)
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(string-append "defined" (list->string (reverse (cons #\) chl))))
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(cpp-err "illegal argument to `defined'")))
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((char-set-contains? c:ir ch)
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(iter (cons ch chl) ec (read-char)))
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((char=? ec #\))
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(if (char=? #\) (skip-il-ws ch))
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(string-append "defined" (list->string (reverse (cons #\) chl))))
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(cpp-err "garbage in argument to `defined'")))
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((char=? ec #\null) ;; past identifier
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(string-append "defined" (list->string (reverse (cons #\) chl)))))
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(else
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(cpp-err "illegal argument to `defined'"))))))
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(let iter ((tkl '()) ; token list (as list of strings)
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(lvl 0) ; level
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(ch (read-char))) ; next character
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(cond
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;; have item to add, but first add in char's
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;;(nxt (iter (cons nxt (add-chl chl tkl)) '() #f lvl ch))
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;; If end of string or see end-ch at level 0, then return.
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((eof-object? ch) (rtokl->string tkl))
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((and (eqv? end-tok ch) (zero? lvl))
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(unread-char ch) (rtokl->string tkl))
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((and end-tok (char=? #\) ch) (zero? lvl))
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(unread-char ch) (rtokl->string tkl))
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((read-c-comm ch #f) =>
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(lambda (cp) (iter (acons `comm (cdr cp) tkl) lvl (read-char))))
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((char-set-contains? c:ws ch)
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(if (and (pair? tkl) (char? (car tkl)))
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(iter (cons 'space tkl) lvl (read-char))
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(iter tkl lvl (read-char))))
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((char=? #\( ch) (iter (cons ch tkl) (1+ lvl) (read-char)))
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((char=? #\) ch) (iter (cons ch tkl) (1- lvl) (read-char)))
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((char=? #\# ch)
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(let ((ch (read-char)))
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(if (eqv? ch #\#)
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(iter (cons 'dhash tkl) lvl (read-char))
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(iter (cons 'hash tkl) lvl ch))))
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((read-c-string ch) =>
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(lambda (st) (iter (acons 'string st tkl) lvl (read-char))))
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((read-c-ident ch) =>
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(lambda (iden)
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(if (equal? iden "defined")
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;; "defined" is a special case
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(let ((arg (scan-defined-arg)))
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(iter (acons 'defined arg tkl) lvl (read-char)))
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;; otherwise ...
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(let* ((aval (assoc-ref argd iden)) ; lookup argument
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(rval (assoc-ref dict iden))) ; lookup macro def
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(cond
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((member iden used) ; name used
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(iter (cons iden tkl) lvl (read-char)))
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(aval ; arg ref
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(iter (acons 'arg aval tkl) lvl (read-char)))
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((string? rval) ; cpp repl
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(iter (acons 'string rval tkl) lvl (read-char)))
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((pair? rval) ; cpp macro
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(let* ((argl (car rval)) (text (cdr rval))
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(argd (collect-args argl argd dict used))
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(newl (expand-cpp-repl text argd dict (cons iden used))))
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(iter (acons 'string newl tkl) lvl (read-char))))
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(else ; normal identifier
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(iter (acons 'ident iden tkl) lvl (read-char))))))))
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(else
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(iter (cons ch tkl) lvl (read-char))))))
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;; @deffn collect-args argl argd dict used => argd
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;; to be documented
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;; I think argd is a passthrough for scan-cpp-input
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;; argl: list of formal arguments in #define
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;; argd: used? (maybe just a pass-through for scan-cpp-input
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;; dict: dict of macro defs
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;; used: list of already expanded macros
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;; TODO clean this up
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;; should be looking at #\( and eat up to matching #\)
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(define (collect-args argl argd dict used)
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(let iter ((argl argl) (argv '()) (ch (skip-il-ws (read-char))))
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;; ch should always be #\(, #\, or #\)
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(cond
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((eqv? ch #\)) (reverse argv))
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((null? argl) (cpp-err "arg count"))
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((and (null? (cdr argl)) (string=? (car argl) "..."))
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(let ((val (scan-cpp-input argd dict used #\))))
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(iter (cdr argl) (acons "__VA_ARGS__" val argv) (read-char))))
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((or (eqv? ch #\() (eqv? ch #\,))
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(let ((val (scan-cpp-input argd dict used #\,)))
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(iter (cdr argl) (acons (car argl) val argv) (read-char))))
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(else (error "coding error, ch=" ch)))))
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;; @deffn expand-cpp-repl
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;; to be documented
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(define (expand-cpp-repl repl argd dict used)
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(with-input-from-string repl
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(lambda () (scan-cpp-input argd dict used #f))))
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;; @deffn cpp-expand-text text dict => string
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(define (cpp-expand-text text dict)
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(with-input-from-string text
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(lambda () (scan-cpp-input '() dict '() #f))))
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;; @deffn expand-cpp-macro-ref ident dict => repl|#f
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;; Given an identifier seen in C99 input, this checks for associated
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;; definition in @var{dict} (generated from CPP defines). If found,
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;; the expansion is returned as a string. If @var{ident} refers
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;; to a macro with arguments, then the arguments will be read from the
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;; current input. The format of the @code{dict} entries are
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;; @example
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;; ("ABC" . "123")
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;; ("MAX" ("X" "Y") . "((X)>(Y)?(X):(Y))")
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;; @end example
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(define (expand-cpp-macro-ref ident dict . rest)
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(let ((used (if (pair? rest) (car rest) '()))
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(rval (assoc-ref dict ident)))
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(cond
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((not rval) #f)
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((string=? rval "C99_ANY") #f) ; don't expand: could be anything
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;; move FILE LINE to expand-cpp-repl?
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((string=? rval "__FILE__")
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(string-append "\"" (or (port-filename (current-input-port))
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"(unknown)") "\""))
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((string=? rval "__LINE__") (1+ (port-line (current-input-port))))
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;;
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((member ident used) ident)
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((string? rval)
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(let ((expd (expand-cpp-repl rval '() dict (cons ident used))))
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expd))
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((pair? rval)
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(let* ((argl (car rval)) (repl (cdr rval))
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(argd (collect-args argl '() dict '()))
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(expd (expand-cpp-repl repl argd dict (cons ident used))))
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expd)))))
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;;; --- last line ---
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