458 lines
16 KiB
Scheme
458 lines
16 KiB
Scheme
;;; lang/c99/body.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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;; Notes on the code design may be found in doc/nyacc/lang/c99-hg.info
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;; @section The C99 Parser Body
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;; This code provides the front end to the C99 parser, including the lexical
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;; analyzer and optional CPP processing. In @code{'file} mode the lex'er
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;; passes CPP statements to the parser; in @code{'code} mode the lex'er
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;; parses and evaluates the CPP statements. In the case of included files
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;; (e.g., via @code{#include <file.h>}) the include files are parsed if
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;; not in @code{inc-help}. The a-list @code{inc-help} maps
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;; include file names to typenames (e.g., @code{stdio.h} to @code{FILE}) and
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;; CPP defines (e.g., "INT_MAX=12344").
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(use-modules ((srfi srfi-9) #:select (define-record-type)))
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(use-modules ((sxml xpath) #:select (sxpath)))
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(use-modules (ice-9 regex))
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(define-record-type cpi
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(make-cpi-1)
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cpi?
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(debug cpi-debug set-cpi-debug!) ; debug #t #f
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(defines cpi-defs set-cpi-defs!) ; #defines
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(incdirs cpi-incs set-cpi-incs!) ; #includes
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(inc-tynd cpi-itynd set-cpi-itynd!) ; a-l of incfile => typenames
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(inc-defd cpi-idefd set-cpi-idefd!) ; a-l of incfile => defines
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(ptl cpi-ptl set-cpi-ptl!) ; parent typename list
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(ctl cpi-ctl set-cpi-ctl!) ; current typename list
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)
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;;.@deffn split-cppdef defstr => (<name> . <repl>)|((<name> <args> . <repl>)|#f
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;; Convert define string to a dict item. Examples:
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;; @example
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;; "ABC=123" => '("ABC" . "123")
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;; "MAX(X,Y)=((X)>(Y)?(X):(Y))" => ("MAX" ("X" "Y") . "((X)>(Y)?(X):(Y))")
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;; @end example
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(define split-cppdef
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(let ((rx1 (make-regexp "^([A-Za-z0-9_]+)\\([^)]*\\)=(.*)$"))
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(rx2 (make-regexp "^([A-Za-z0-9_]+)=(.*)$")))
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(lambda (defstr)
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(let* ((m1 (regexp-exec rx1 defstr))
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(m2 (or m1 (regexp-exec rx2 defstr))))
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(cond
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((regexp-exec rx1 defstr) =>
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(lambda (m)
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(let* ((s1 (match:substring m1 1))
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(s2 (match:substring m1 2))
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(s3 (match:substring m1 3)))
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(cons s1 (cons s2 s3)))))
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((regexp-exec rx2 defstr) =>
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(lambda (m)
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(let* ((s1 (match:substring m2 1))
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(s2 (match:substring m2 2)))
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(cons s1 s2))))
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(else #f))))))
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;; @deffn make-cpi debug defines incdirs inchelp
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(define (make-cpi debug defines incdirs inchelp)
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;; convert inchelp into inc-file->typenames and inc-file->defines
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;; Any entry for an include file which contains `=' is considered
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;; a define; otherwise, the entry is a typename.
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(define (split-helper helper)
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(let ((file (car helper)))
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(let iter ((tyns '()) (defs '()) (ents (cdr helper)))
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(cond
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((null? ents) (values (cons file tyns) (cons file defs)))
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((split-cppdef (car ents)) =>
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(lambda (def) (iter tyns (cons def defs) (cdr ents))))
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(else (iter (cons (car ents) tyns) defs (cdr ents)))))))
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(let* ((cpi (make-cpi-1)))
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(set-cpi-debug! cpi debug) ; print states debug
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(set-cpi-defs! cpi (map split-cppdef defines)) ; list of define strings
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(set-cpi-incs! cpi incdirs) ; list of include dir's
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(set-cpi-ptl! cpi '()) ; list of lists of typenames
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(set-cpi-ctl! cpi '()) ; list of typenames
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;; itynd idefd:
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(let iter ((itynd '()) (idefd '()) (helpers inchelp))
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(cond ((null? helpers)
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(set-cpi-itynd! cpi itynd)
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(set-cpi-idefd! cpi idefd))
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(else
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(call-with-values
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(lambda () (split-helper (car helpers)))
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(lambda (ityns idefs)
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(iter (cons ityns itynd) (cons idefs idefd) (cdr helpers)))))))
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cpi))
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(define *info* (make-fluid #f))
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;; @deffn typename? name
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;; Called by lexer to determine if symbol is a typename.
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;; Check current sibling for each generation.
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(define (typename? name)
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(let ((cpi (fluid-ref *info*)))
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(if (member name (cpi-ctl cpi)) #t
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(let iter ((ptl (cpi-ptl cpi)))
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(if (null? ptl) #f
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(if (member name (car ptl)) #t
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(iter (cdr ptl))))))))
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;; @deffn add-typename name
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;; Helper for @code{save-typenames}.
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(define (add-typename name)
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(let ((cpi (fluid-ref *info*)))
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(set-cpi-ctl! cpi (cons name (cpi-ctl cpi)))))
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(define (cpi-push) ;; on #if
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(let ((cpi (fluid-ref *info*)))
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(set-cpi-ptl! cpi (cons (cpi-ctl cpi) (cpi-ptl cpi)))
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(set-cpi-ctl! cpi '())))
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(define (cpi-shift) ;; on #elif #else
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(set-cpi-ctl! (fluid-ref *info*) '()))
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(define (cpi-pop) ;; on #endif
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(let ((cpi (fluid-ref *info*)))
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(set-cpi-ctl! cpi (append (cpi-ctl cpi) (car (cpi-ptl cpi))))
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(set-cpi-ptl! cpi (cdr (cpi-ptl cpi)))))
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;; @deffn find-new-typenames decl
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;; Helper for @code{save-typenames}.
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;; Given declaration return a list of new typenames (via @code{typedef}).
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(define (find-new-typenames decl)
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;; like declr->ident in util2.scm
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(define (declr->id-name declr)
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(case (car declr)
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((ident) (sx-ref declr 1))
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((init-declr) (declr->id-name (sx-ref declr 1)))
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((comp-declr) (declr->id-name (sx-ref declr 1)))
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((array-of) (declr->id-name (sx-ref declr 1)))
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((ptr-declr) (declr->id-name (sx-ref declr 2)))
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((ftn-declr) (declr->id-name (sx-ref declr 1)))
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((scope) (declr->id-name (sx-ref declr 1)))
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(else (error "coding bug: " declr))))
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(let* ((spec (sx-ref decl 1))
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(stor (sx-find 'stor-spec spec))
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(id-l (sx-ref decl 2)))
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(if (and stor (eqv? 'typedef (caadr stor)))
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(let iter ((res '()) (idl (cdr id-l)))
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(if (null? idl) res
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(iter (cons (declr->id-name (sx-ref (car idl) 1)) res)
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(cdr idl))))
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'())))
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;; @deffn save-typenames decl
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;; Save the typenames for the lexical analyzer and return the decl.
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(define (save-typenames decl)
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;; This finds typenames using @code{find-new-typenames} and adds via
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;; @code{add-typename}. Then return the decl.
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(for-each add-typename (find-new-typenames decl))
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decl)
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;; ------------------------------------------------------------------------
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(define (p-err . args)
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(apply throw 'c99-error args))
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;; @deffn read-cpp-line ch => #f | (cpp-xxxx)??
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;; Given if ch is #\# read a cpp-statement.
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;; The standard implies that comments are tossed here but we keep them
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;; so that they can end up in the pretty-print output.
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(define (read-cpp-line ch)
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(if (not (eq? ch #\#)) #f
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(let iter ((cl '()) (ch (read-char)))
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(cond
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((eof-object? ch) (throw 'cpp-error "CPP lines must end in newline"))
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((eq? ch #\newline) (unread-char ch) (list->string (reverse cl)))
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((eq? ch #\\)
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(let ((c2 (read-char)))
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(if (eq? c2 #\newline)
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(iter cl (read-char))
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(iter (cons* c2 ch cl) (read-char)))))
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((eq? ch #\/) ;; swallow comments, event w/ newlines
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(let ((c2 (read-char)))
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(cond
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((eqv? c2 #\*)
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(let iter2 ((cl2 (cons* #\* #\/ cl)) (ch (read-char)))
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(cond
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((eq? ch #\*)
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(let ((c2 (read-char)))
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(if (eqv? c2 #\/)
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(iter (cons* #\/ #\* cl2) (read-char)) ;; keep comment
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(iter2 (cons #\* cl2) c2))))
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(else
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(iter2 (cons ch cl2) (read-char))))))
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(else
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(iter (cons #\/ cl) c2)))))
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(else (iter (cons ch cl) (read-char)))))))
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;; @deffn find-file-in-dirl file dirl => path
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(define (find-file-in-dirl file dirl)
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(let iter ((dirl dirl))
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(if (null? dirl) #f
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(let ((p (string-append (car dirl) "/" file)))
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(if (access? p R_OK) p (iter (cdr dirl)))))))
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(define (def-xdef? name mode)
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(eqv? mode 'code))
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;; @deffn gen-c-lexer [#:mode mode] [#:xdef? proc] => procedure
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;; Generate a context-sensitive lexer for the C99 language. The generated
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;; lexical analyzer reads and passes comments and optionally CPP statements
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;; to the parser. The keyword argument @var{mode} will determine if CPP
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;; statements are passed (@code{'file} mode) or parsed and executed
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;; (@code{'file} mode) as described above. Comments will be passed as
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;; ``line'' comments or ``lone'' comments: lone comments appear on a line
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;; without code. The @code{xdef?} keyword argument allows user to pass
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;; a predicate which determines whether CPP symbols in code are expanded.
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;; The default predicate is
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;; @example
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;; (define (def-xdef? mode name) (eqv? mode 'code))
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;; @end example
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(define gen-c-lexer
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;; This gets ugly in order to handle cpp.
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;;.need to add support for num's w/ letters like @code{14L} and @code{1.3f}.
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;; todo: I think there is a bug wrt the comment reader because // ... \n
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;; will end up in same mode... so after
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;; int x; // comment
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;; the lexer will think we are not at BOL.
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(let* ((match-table mtab)
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(read-ident read-c-ident)
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(read-comm read-c-comm)
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;;
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(ident-like? (make-ident-like-p read-ident))
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;;
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(strtab (filter-mt string? match-table)) ; strings in grammar
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(kwstab (filter-mt ident-like? strtab)) ; keyword strings =>
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(keytab (map-mt string->symbol kwstab)) ; keywords in grammar
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(chrseq (remove-mt ident-like? strtab)) ; character sequences
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(symtab (filter-mt symbol? match-table)) ; symbols in grammar
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(chrtab (filter-mt char? match-table)) ; characters in grammar
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;;
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(read-chseq (make-chseq-reader chrseq))
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(assc-$ (lambda (pair) (cons (assq-ref symtab (car pair)) (cdr pair))))
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;;
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(t-ident (assq-ref symtab '$ident))
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(t-typename (assq-ref symtab 'typename))
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(xp1 (sxpath '(cpp-stmt define)))
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(xp2 (sxpath '(decl))))
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;; mode: 'code|'file
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;; xdef?: (proc name mode) => #t|#f : do we expand #define?
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(lambda* (#:key (mode 'code) (xdef? #f))
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(let ((bol #t) ; begin-of-line condition
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(ppxs (list 'keep)) ; CPP execution state stack
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(info (fluid-ref *info*)) ; assume make and run in same thread
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(x-def? (or xdef? def-xdef?)))
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;; Return the first (tval . lval) pair not excluded by the CPP.
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(lambda ()
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(define (exec-cpp?) ; exec (vs pass to parser) CPP stmts?
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(eqv? mode 'code))
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(define (cpp-flow? keyw)
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(memq keyw '(if elif else)))
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(define (add-define tree)
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(let* ((tail (cdr tree))
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(name (car (assq-ref tail 'name)))
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(args (assq-ref tail 'args))
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(repl (car (assq-ref tail 'repl)))
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(cell (cons name (if args (cons args repl) repl))))
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(set-cpi-defs! info (cons cell (cpi-defs info)))))
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(define (rem-define name)
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(set-cpi-defs! info (delete name (cpi-defs info))))
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;; Evaluate expression text in #if of #elif statement.
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(define (eval-cpp-cond-text text)
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(with-throw-handler
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'cpp-error
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(lambda ()
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(let* ((defs (cpi-defs info))
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(rhs (cpp-expand-text text defs))
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(exp (parse-cpp-expr rhs)))
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(eval-cpp-expr exp defs)))
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(lambda (key fmt . args)
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(report-error fmt args)
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(throw 'c99-error "CPP error"))))
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(define (inc-stmt->file stmt)
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(let* ((arg (cadr stmt)) (len (string-length arg)))
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(substring arg 1 (1- len))))
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(define (inc-file->path file)
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(find-file-in-dirl file (cpi-incs info)))
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(define (eval-cpp-stmt-1/code stmt)
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;; eval control flow: states are {skip-look, keep, skip-done}
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(case (car stmt)
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((if)
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(let ((val (eval-cpp-cond-text (cadr stmt))))
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(if (not val) (p-err "unresolved: ~S" (cadr stmt)))
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(if (eq? 'keep (car ppxs))
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(if (zero? val)
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(set! ppxs (cons 'skip-look ppxs))
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(set! ppxs (cons 'keep ppxs)))
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(set! ppxs (cons 'skip-done ppxs)))))
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((elif)
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(let ((val (eval-cpp-cond-text (cadr stmt))))
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(if (not val) (p-err "unresolved: ~S" (cadr stmt)))
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(case (car ppxs)
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((skip-look) (if (not (zero? val)) (set-car! ppxs 'keep)))
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((keep) (set-car! ppxs 'skip-done)))))
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((else)
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(case (car ppxs)
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((skip-look) (set-car! ppxs 'keep))
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((keep) (set-car! ppxs 'skip-done))))
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((endif)
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(set! ppxs (cdr ppxs)))
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(else
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(if (eqv? 'keep (car ppxs))
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(eval-cpp-stmt-2/code stmt)))))
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(define (apply-helper file)
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(let* ((tyns (assoc-ref (cpi-itynd info) file))
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(defs (assoc-ref (cpi-idefd info) file)))
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(when tyns
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(for-each add-typename tyns)
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(set-cpi-defs! info (append defs (cpi-defs info))))
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(pair? tyns)))
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(define (eval-cpp-stmt-2/code stmt)
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;; eval non-control flow
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(case (car stmt)
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;; actions
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((include)
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(let* ((file (inc-stmt->file stmt))
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(path (inc-file->path file)))
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(cond
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((apply-helper file)) ; use helper
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((not path) (p-err "not found: ~S" file)) ; file not found
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(else (push-input (open-input-file path))))))
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((define) (add-define stmt))
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((undef) (rem-define (cadr stmt)))
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((error) (p-err "error: #error ~A" (cadr stmt)))
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((pragma) #t) ;; ignore for now
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(else (error "bad cpp flow stmt"))))
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(define (eval-cpp-stmt-1/file stmt)
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(case (car stmt)
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((if) (cpi-push))
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((elif else) (cpi-shift))
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((endif) (cpi-pop))
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(else (eval-cpp-stmt-2/file stmt))))
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(define (eval-cpp-stmt-2/file stmt)
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;; eval non-control flow
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(case (car stmt)
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;; includes
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((include)
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(let* ((file (inc-stmt->file stmt))
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(path (inc-file->path file)))
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(cond
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((apply-helper file)) ; use helper
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((not path) (p-err "not found: ~S" file)) ; file not found
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((with-input-from-file path run-parse) => ; include tree
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(lambda (tree) (for-each add-define (xp1 tree))))
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(else (p-err "included from ~S" path)))))
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((define) (add-define stmt))
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((undef) (rem-define (cadr stmt)))
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((error) #f)
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((pragma) #t) ;; need to work this
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(else (error "bad cpp flow stmt"))))
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(define (eval-cpp-stmt stmt)
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(with-throw-handler
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'cpp-error
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(lambda ()
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(case mode
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((code) (eval-cpp-stmt-1/code stmt))
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((file) (eval-cpp-stmt-1/file stmt))))
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(lambda (key fmt . rest)
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(report-error fmt rest)
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(throw 'c99-error "CPP error"))))
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;; Composition of @code{read-cpp-line} and @code{eval-cpp-line}.
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;; We should not be doing this!
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(define (read-cpp-stmt ch)
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(and=> (read-cpp-line ch) cpp-line->stmt))
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(define (read-token)
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(let iter ((ch (read-char)))
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(cond
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((eof-object? ch)
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(if (pop-input) (iter (read-char)) (assc-$ '($end . ""))))
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((eq? ch #\newline) (set! bol #t) (iter (read-char)))
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((char-set-contains? c:ws ch) (iter (read-char)))
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(bol
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(set! bol #f)
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(cond ;; things that depend on bol only
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((read-comm ch #t) => assc-$)
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((read-cpp-stmt ch) =>
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(lambda (stmt)
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(eval-cpp-stmt stmt)
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(case mode
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((code) (iter (read-char)))
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((file) (assc-$ `(cpp-stmt . ,stmt))))))
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(else (iter ch))))
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((read-ident ch) =>
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(lambda (name)
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(let ((symb (string->symbol name)))
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(cond
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((and (x-def? name mode)
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(expand-cpp-macro-ref name (cpi-defs info)))
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=> (lambda (st)
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(push-input (open-input-string st))
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|
(iter (read-char))))
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|
((assq-ref keytab symb)
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|
=> (lambda (t) (cons t name)))
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|
((typename? name)
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|
(cons (assq-ref symtab 'typename) name))
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|
(else
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|
(cons (assq-ref symtab '$ident) name))))))
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|
((read-c-num ch) => assc-$)
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|
((read-c-string ch) => assc-$)
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|
((read-c-chlit ch) => assc-$)
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|
((read-comm ch #f) => assc-$)
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|
((read-chseq ch) => identity)
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|
((assq-ref chrtab ch) => (lambda (t) (cons t (string ch))))
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|
((eqv? ch #\\) ;; C allows \ at end of line to continue
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|
(let ((ch (read-char)))
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|
(cond ((eqv? #\newline ch) (iter (read-char))) ;; extend line
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|
(else (unread-char ch) (cons #\\ "\\"))))) ;; parse err
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|
(else (cons ch (string ch))))))
|
|
|
|
;; Loop between reading tokens and skipping tokens via CPP logic.
|
|
(let iter ((pair (read-token)))
|
|
(case (car ppxs)
|
|
((keep)
|
|
pair)
|
|
((skip-done skip-look)
|
|
(iter (read-token)))
|
|
((skip1-pop)
|
|
(set! ppxs (cdr ppxs))
|
|
(iter (read-token)))))
|
|
)))))
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|
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;; --- last line ---
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