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c-backend.scm
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c-backend.scm
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;;; c-backend.scm - C-generating backend for the CHICKEN compiler
;
; Copyright (c) 2008-2011, The Chicken Team
; Copyright (c) 2000-2007, Felix L. Winkelmann
; All rights reserved.
;
; Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following
; conditions are met:
;
; Redistributions of source code must retain the above copyright notice, this list of conditions and the following
; disclaimer.
; Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
; disclaimer in the documentation and/or other materials provided with the distribution.
; Neither the name of the author nor the names of its contributors may be used to endorse or promote
; products derived from this software without specific prior written permission.
;
; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
; AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
; CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
; CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
; SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
; OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
; POSSIBILITY OF SUCH DAMAGE.
(declare (unit backend))
(include "compiler-namespace")
(include "tweaks")
;;; Write atoms to output-port:
(define output #f)
(define (gen . data)
(for-each
(lambda (x)
(if (eq? #t x)
(newline output)
(display x output) ) )
data) )
(define (gen-list lst)
(for-each
(lambda (x) (display x output))
(intersperse lst #\space) ) )
;;; Unique id/prefix:
(define unique-id
(string->c-identifier
(sprintf "C_~X_~A_" (random #x1000000) (current-seconds)) ) )
;;; Generate target code:
(define (generate-code literals lliterals lambdas out source-file dynamic db)
(let ()
;; Some helper procedures
(define (find-lambda id)
(or (find (lambda (ll) (eq? id (lambda-literal-id ll))) lambdas)
(bomb "can't find lambda" id) ) )
(define (slashify s) (string-translate (->string s) "\\" "/"))
(define (uncommentify s) (string-translate* (->string s) '(("*/" . "* /"))))
;; Compile a single expression
(define (expression node temps ll)
(define (expr n i)
(let ((subs (node-subexpressions n))
(params (node-parameters n)) )
(case (node-class n)
((##core#immediate)
(case (first params)
((bool) (gen (if (second params) "C_SCHEME_TRUE" "C_SCHEME_FALSE")))
((char) (gen "C_make_character(" (char->integer (second params)) #\)))
((nil) (gen "C_SCHEME_END_OF_LIST"))
((fix) (gen "C_fix(" (second params) #\)))
((eof) (gen "C_SCHEME_END_OF_FILE"))
(else (bomb "bad immediate")) ) )
((##core#literal)
(let ((lit (first params)))
(if (vector? lit)
(gen "((C_word)li" (vector-ref lit 0) ")")
(gen "lf[" (first params) #\])) ) )
((if)
(gen #t "if(C_truep(")
(expr (car subs) i)
(gen ")){")
(expr (cadr subs) i)
(gen #\} #t "else{")
(expr (caddr subs) i)
(gen #\}) )
((##core#proc)
(gen "(C_word)" (first params)) )
((##core#bind)
(let loop ((bs subs) (i i) (count (first params)))
(cond [(> count 0)
(gen #t #\t i #\=)
(expr (car bs) i)
(gen #\;)
(loop (cdr bs) (add1 i) (sub1 count)) ]
[else (expr (car bs) i)] ) ) )
((##core#let_unboxed)
(let ((name (first params)))
(gen #t name #\=)
(expr (first subs) i)
(gen #\;)
(expr (second subs) i)))
((##core#ref)
(gen "((C_word*)")
(expr (car subs) i)
(gen ")[" (+ (first params) 1) #\]) )
((##core#unbox)
(gen "((C_word*)")
(expr (car subs) i)
(gen ")[1]") )
((##core#update_i)
(gen "C_set_block_item(")
(expr (car subs) i)
(gen #\, (first params) #\,)
(expr (cadr subs) i)
(gen #\)) )
((##core#update)
(gen "C_mutate(((C_word *)")
(expr (car subs) i)
(gen ")+" (+ (first params) 1) ",")
(expr (cadr subs) i)
(gen #\)) )
((##core#updatebox_i)
(gen "C_set_block_item(")
(expr (car subs) i)
(gen ",0,")
(expr (cadr subs) i)
(gen #\)) )
((##core#updatebox)
(gen "C_mutate(((C_word *)")
(expr (car subs) i)
(gen ")+1,")
(expr (cadr subs) i)
(gen #\)) )
((##core#closure)
(let ((n (first params)))
(gen "(*a=C_CLOSURE_TYPE|" n #\,)
(for-each
(lambda (x j)
(gen "a[" j "]=")
(expr x i)
(gen #\,) )
subs (iota n 1 1) )
(gen "tmp=(C_word)a,a+=" (add1 n) ",tmp)") ) )
((##core#box)
(gen "(*a=C_VECTOR_TYPE|1,a[1]=")
(expr (car subs) i)
(gen ",tmp=(C_word)a,a+=2,tmp)") )
((##core#local) (gen #\t (first params)))
((##core#setlocal)
(gen #\t (first params) #\=)
(expr (car subs) i) )
((##core#global)
(let ((index (first params))
(safe (second params))
(block (third params)) )
(cond [block
(if safe
(gen "lf[" index "]")
(gen "C_retrieve2(lf[" index "]," (c-ify-string (symbol->string (fourth params))) #\)) ) ]
[safe (gen "*((C_word*)lf[" index "]+1)")]
[else (gen "C_fast_retrieve(lf[" index "])")] ) ) )
((##core#setglobal)
(let ((index (first params))
(block (second params))
(var (third params)))
(if block
(gen "C_mutate(&lf[" index "]")
(gen "C_mutate((C_word*)lf[" index "]+1") )
(gen " /* (set! " (uncommentify (##sys#symbol->qualified-string var)) " ...) */,")
(expr (car subs) i)
(gen #\)) ) )
((##core#setglobal_i)
(let ((index (first params))
(block (second params))
(var (third params)) )
(cond [block
(gen "lf[" index "] /* "
(uncommentify (symbol->string var)) " */ =")
(expr (car subs) i)
(gen #\;) ]
[else
(gen "C_set_block_item(lf[" index "] /* "
(uncommentify (symbol->string var)) " */,0,")
(expr (car subs) i)
(gen #\)) ] ) ) )
((##core#undefined) (gen "C_SCHEME_UNDEFINED"))
((##core#call)
(let* ((args (cdr subs))
(n (length args))
(nc i)
(nf (add1 n))
(p2 (pair? (cdr params)))
(name (and p2 (second params)))
(name-str (source-info->string name))
(call-id (and p2 (pair? (cddr params)) (third params)))
(customizable (and call-id (fourth params)))
(empty-closure (and customizable (zero? (lambda-literal-closure-size (find-lambda call-id)))))
(fn (car subs)) )
(when name
(if emit-trace-info
(gen #t "C_trace(\"" (slashify name-str) "\");")
(gen #t "/* " (uncommentify name-str) " */") ) )
(cond ((eq? '##core#proc (node-class fn))
(let ([fpars (node-parameters fn)])
(gen #t (first fpars) #\( nf ",0,") )
(expr-args args i)
(gen ");") )
(call-id
(cond ((and (eq? call-id (lambda-literal-id ll))
(lambda-literal-looping ll) )
(let* ([temps (lambda-literal-temporaries ll)]
[ts (iota n (+ temps nf) 1)] )
(for-each
(lambda (arg tr)
(gen #t #\t tr #\=)
(expr arg i)
(gen #\;) )
args ts)
(for-each
(lambda (from to) (gen #t #\t to "=t" from #\;))
ts (iota n 1 1) )
(unless customizable (gen #t "c=" nf #\;))
(gen #t "goto loop;") ) )
(else
(unless empty-closure
(gen #t #\t nc #\=)
(expr fn i)
(gen #\;) )
(gen #t call-id #\()
(unless customizable (gen nf #\,))
(unless empty-closure (gen #\t nc #\,))
(expr-args args i)
(gen ");") ) ) )
((and (eq? '##core#global (node-class fn))
(not unsafe)
(not no-procedure-checks)
(not (first params)))
(let* ((gparams (node-parameters fn))
(index (first gparams))
(safe (second gparams))
(block (third gparams))
(carg #f))
(gen #t "((C_proc" nf ")")
(cond (no-global-procedure-checks
(set! carg
(if block
(string-append "lf[" (number->string index) "]")
(string-append "*((C_word*)lf[" (number->string index) "]+1)")))
(gen "(void*)(*((C_word*)(" carg ")+1))"))
(block
(set! carg (string-append "lf[" (number->string index) "]"))
(if safe
(gen "C_fast_retrieve_proc(" carg ")")
(gen "C_retrieve2_symbol_proc(" carg ","
(c-ify-string (symbol->string (fourth gparams))) #\)) ) )
(safe
(set! carg
(string-append "*((C_word*)lf[" (number->string index) "]+1)"))
(gen "C_fast_retrieve_proc(" carg ")"))
(else
(set! carg
(string-append "*((C_word*)lf[" (number->string index) "]+1)"))
(gen "C_fast_retrieve_symbol_proc(lf[" index "])") ))
(gen ")(" nf #\, carg #\,)
(expr-args args i)
(gen ");") ) )
(else
(gen #t #\t nc #\=)
(expr fn i)
(gen #\; #t
"((C_proc" nf ")")
(if (or unsafe no-procedure-checks (first params))
(gen "(void*)(*((C_word*)t" nc "+1))")
(gen "C_fast_retrieve_proc(t" nc ")") )
(gen ")(" nf ",t" nc #\,)
(expr-args args i)
(gen ");") ) ) ) )
((##core#recurse)
(let* ([n (length subs)]
[nf (add1 n)]
[tailcall (first params)]
[call-id (second params)]
[empty-closure (zero? (lambda-literal-closure-size ll))] )
(cond (tailcall
(let* ([temps (lambda-literal-temporaries ll)]
[ts (iota n (+ temps nf) 1)] )
(for-each
(lambda (arg tr)
(gen #t #\t tr #\=)
(expr arg i)
(gen #\;) )
subs ts)
(for-each
(lambda (from to) (gen #t #\t to "=t" from #\;))
ts (iota n 1 1) )
(gen #t "goto loop;") ) )
(else
(gen call-id #\()
(unless empty-closure (gen "t0,"))
(expr-args subs i)
(gen #\)) ) ) ) )
((##core#direct_call)
(let* ((args (cdr subs))
(n (length args))
(nf (add1 n))
;;(name (second params))
(call-id (third params))
(demand (fourth params))
(allocating (not (zero? demand)))
(empty-closure (zero? (lambda-literal-closure-size (find-lambda call-id))))
(fn (car subs)) )
(gen call-id #\()
(when allocating
(gen "C_a_i(&a," demand #\))
(when (or (not empty-closure) (pair? args)) (gen #\,)) )
(unless empty-closure
(expr fn i)
(when (pair? args) (gen #\,)) )
(when (pair? args) (expr-args args i))
(gen #\)) ) )
((##core#callunit)
;; The code generated here does not use the extra temporary needed for standard calls, so we have
;; one unused varable:
(let* ((n (length subs))
(nf (+ n 1)) )
(gen #t "C_" (first params) "_toplevel(" nf ",C_SCHEME_UNDEFINED,")
(expr-args subs i)
(gen ");") ) )
((##core#return)
(gen #t "return(")
(expr (first subs) i)
(gen ");") )
((##core#inline)
(gen (first params) #\()
(expr-args subs i)
(gen #\)) )
((##core#inline_allocate)
(gen (first params) "(&a," (length subs))
(if (pair? subs)
(begin
(gen #\,)
(expr-args subs i) ) )
(gen #\)) )
((##core#inline_ref)
(gen (foreign-result-conversion (second params) "a") (first params) #\)) )
((##core#inline_update)
(let ([t (second params)])
(gen #\( (first params) "=(" (foreign-type-declaration t "") #\) (foreign-argument-conversion t))
(expr (first subs) i)
(gen "),C_SCHEME_UNDEFINED)") ) )
((##core#inline_loc_ref)
(let ([t (first params)])
(gen (foreign-result-conversion t "a") "*((" (foreign-type-declaration t "") "*)C_data_pointer(")
(expr (first subs) i)
(gen ")))") ) )
((##core#inline_loc_update)
(let ([t (first params)])
(gen "((*(" (foreign-type-declaration t "") "*)C_data_pointer(")
(expr (first subs) i)
(gen "))=" (foreign-argument-conversion t))
(expr (second subs) i)
(gen "),C_SCHEME_UNDEFINED)") ) )
((##core#unboxed_ref)
(gen (first params)))
((##core#unboxed_set!)
(gen "((" (first params) #\=)
(expr (first subs) i)
(gen "),C_SCHEME_UNDEFINED)"))
((##core#inline_unboxed) ;XXX is this needed?
(gen (first params) "(")
(expr-args subs i)
(gen #\)))
((##core#switch)
(gen #t "switch(")
(expr (first subs) i)
(gen "){")
(do ([j (first params) (sub1 j)]
[ps (cdr subs) (cddr ps)] )
((zero? j)
(gen #t "default:")
(expr (car ps) i)
(gen #\}) )
(gen #t "case ")
(expr (car ps) i)
(gen #\:)
(expr (cadr ps) i) ) )
((##core#cond)
(gen "(C_truep(")
(expr (first subs) i)
(gen ")?")
(expr (second subs) i)
(gen #\:)
(expr (third subs) i)
(gen #\)) )
(else (bomb "bad form" (node-class n))) ) ) )
(define (expr-args args i)
(pair-for-each
(lambda (xs)
(if (not (eq? xs args)) (gen #\,))
(expr (car xs) i) )
args) )
(expr node temps) )
(define (header)
(define (pad0 n)
(if (< n 10)
(string-append "0" (number->string n))
n) )
(let* ((tm (##sys#decode-seconds (current-seconds) #f))
(min (vector-ref tm 1))
(hour (vector-ref tm 2))
(mday (vector-ref tm 3))
(mon (vector-ref tm 4))
(year (vector-ref tm 5)) )
(gen "/* Generated from " source-file " by the CHICKEN compiler" #t
" http://www.call-with-current-continuation.org" #t
" " (+ 1900 year) #\- (pad0 (add1 mon)) #\- (pad0 mday) #\space (pad0 hour) #\: (pad0 min) #t
(string-intersperse
(map (cut string-append " " <> "\n")
(string-split (chicken-version #t) "\n") )
"")
" command line: ")
(gen-list compiler-arguments)
(gen #t)
(cond [unit-name (gen " unit: " unit-name)]
[else
(gen " used units: ")
(gen-list used-units) ] )
(gen #t "*/" #t #t "#include \"" target-include-file "\"")
(when external-protos-first
(generate-foreign-callback-stub-prototypes foreign-callback-stubs) )
(when (pair? foreign-declarations)
(gen #t)
(for-each (lambda (decl) (gen #t decl)) foreign-declarations) )
(unless external-protos-first
(generate-foreign-callback-stub-prototypes foreign-callback-stubs) ) ) )
(define (trailer)
(gen #t "/* end of file */" #t) )
(define (declarations)
(let ((n (length literals)))
(gen #t #t "static C_PTABLE_ENTRY *create_ptable(void);")
(for-each
(lambda (uu)
(gen #t "C_noret_decl(C_" uu "_toplevel)"
#t "C_externimport void C_ccall C_" uu "_toplevel(C_word c,C_word d,C_word k) C_noret;"))
used-units)
(unless (zero? n)
(gen #t #t "static C_TLS C_word lf[" n "];") )
(gen #t "static double C_possibly_force_alignment;")
(do ((i 0 (add1 i))
(llits lliterals (cdr llits)))
((null? llits))
(let* ((ll (##sys#lambda-info->string (car llits)))
(llen (string-length ll)))
(gen #t "static C_char C_TLS li" i "[] C_aligned={C_lihdr("
(arithmetic-shift llen -16) #\,
(bitwise-and #xff (arithmetic-shift llen -8)) #\,
(bitwise-and #xff llen)
#\))
(do ((n 0 (add1 n)))
((>= n llen))
(gen #\, (char->integer (string-ref ll n))) )
(do ((n (- (bitwise-and #xfffff8 (+ llen 7)) llen) (sub1 n))) ; fill up with zeros to align following entry
((zero? n))
(gen ",0") )
(gen "};")))))
(define (prototypes)
(let ([large-signatures '()])
(gen #t)
(for-each
(lambda (ll)
(let* ([n (lambda-literal-argument-count ll)]
[customizable (lambda-literal-customizable ll)]
[empty-closure (and customizable (zero? (lambda-literal-closure-size ll)))]
[varlist (intersperse (make-variable-list (if empty-closure (sub1 n) n) "t") #\,)]
[id (lambda-literal-id ll)]
[rest (lambda-literal-rest-argument ll)]
[rest-mode (lambda-literal-rest-argument-mode ll)]
[direct (lambda-literal-direct ll)]
[allocated (lambda-literal-allocated ll)] )
(when (>= n small-parameter-limit)
(set! large-signatures (lset-adjoin = large-signatures (add1 n))) )
(gen #t)
(for-each
(lambda (s)
(when (>= s small-parameter-limit)
(set! large-signatures (lset-adjoin = large-signatures (add1 s))) ) )
(lambda-literal-callee-signatures ll) )
(cond [(not (eq? 'toplevel id))
(gen "C_noret_decl(" id ")" #t)
(gen "static ")
(gen (if direct "C_word " "void "))
(if customizable
(gen "C_fcall ")
(gen "C_ccall ") )
(gen id) ]
[else
(let ((uname (if unit-name (string-append unit-name "_toplevel") "toplevel")))
(gen "C_noret_decl(C_" uname ")" #t)
(gen "C_externexport void C_ccall ")
(gen "C_" uname) ) ] )
(gen #\()
(unless customizable (gen "C_word c,"))
(when (and direct (not (zero? allocated)))
(gen "C_word *a")
(when (pair? varlist) (gen #\,)) )
(apply gen varlist)
(cond [rest
(gen ",...) C_noret;")
(if (not (eq? rest-mode 'none))
(begin
(gen #t "C_noret_decl(" id ")"
#t "static void C_ccall " id "r(")
(apply gen varlist)
(gen ",C_word t" (+ n 1) ") C_noret;") ) ) ]
[else
(gen #\))
;;(when customizable (gen " C_c_regparm"))
(unless direct (gen " C_noret"))
(gen #\;) ] ) ) )
lambdas)
(for-each
(lambda (s)
(gen #t "typedef void (*C_proc" s ")(C_word")
(for-each gen (make-list s ",C_word"))
(gen ") C_noret;") )
large-signatures) ) )
(define (trampolines)
(let ([ns '()]
[nsr '()]
[nsrv '()] )
(define (restore n)
(do ((i (- n 1) (- i 1))
(j 0 (+ j 1)) )
((negative? i))
(gen #t "C_word t" i "=C_pick(" j ");") )
(gen #t "C_adjust_stack(-" n ");") )
(define (emitter vflag)
(lambda (n)
(gen #t #t "C_noret_decl(tr" n #\r (if vflag #\v "") ")"
#t "static void C_fcall tr" n #\r (if vflag #\v ""))
(gen "(C_proc" n " k) C_regparm C_noret;")
(gen #t "C_regparm static void C_fcall tr" n #\r)
(when vflag (gen #\v))
(gen "(C_proc" n " k){"
#t "int n;"
#t "C_word *a,t" n #\;)
(restore n)
(gen #t "n=C_rest_count(0);")
(if vflag
(gen #t "a=C_alloc(n+1);")
(gen #t "a=C_alloc(n*3);") )
(gen #t #\t n "=C_restore_rest")
(when vflag (gen "_vector"))
(gen "(a,n);")
(gen #t "(k)(")
(apply gen (intersperse (make-argument-list (+ n 1) "t") #\,))
(gen ");}") ) )
(for-each
(lambda (ll)
(let* ([argc (lambda-literal-argument-count ll)]
[rest (lambda-literal-rest-argument ll)]
[rest-mode (lambda-literal-rest-argument-mode ll)]
[id (lambda-literal-id ll)]
[customizable (lambda-literal-customizable ll)]
[empty-closure (and customizable (zero? (lambda-literal-closure-size ll)))] )
(when empty-closure (set! argc (sub1 argc)))
(unless (lambda-literal-direct ll)
(cond [customizable
(gen #t #t "C_noret_decl(tr" id ")"
#t "static void C_fcall tr" id "(void *dummy) C_regparm C_noret;")
(gen #t "C_regparm static void C_fcall tr" id "(void *dummy){")
(restore argc)
(gen #t id #\()
(let ([al (make-argument-list argc "t")])
(apply gen (intersperse al #\,)) )
(gen ");}") ]
[(or rest (> (lambda-literal-allocated ll) 0) (lambda-literal-external ll))
(if (and rest (not (eq? rest-mode 'none)))
(set! nsr (lset-adjoin = nsr argc))
(set! ns (lset-adjoin = ns argc)) ) ] ) ) ) )
lambdas)
(for-each
(lambda (n)
(gen #t #t "C_noret_decl(tr" n ")"
#t "static void C_fcall tr" n "(C_proc" n " k) C_regparm C_noret;")
(gen #t "C_regparm static void C_fcall tr" n "(C_proc" n " k){")
(restore n)
(gen #t "(k)(" n #\,)
(apply gen (intersperse (make-argument-list n "t") #\,))
(gen ");}") )
ns)
(for-each (emitter #f) nsr)
(for-each (emitter #t) nsrv) ) )
(define (literal-frame)
(do ([i 0 (add1 i)]
[lits literals (cdr lits)] )
((null? lits))
(gen-lit (car lits) (sprintf "lf[~s]" i)) ) )
(define (bad-literal lit)
(bomb "type of literal not supported" lit) )
(define (literal-size lit)
(cond [(immediate? lit) 0]
[(string? lit) 0]
[(number? lit) words-per-flonum]
[(symbol? lit) 10] ; size of symbol, and possibly a bucket
[(pair? lit) (+ 3 (literal-size (car lit)) (literal-size (cdr lit)))]
[(vector? lit) (+ 1 (vector-length lit) (reduce + 0 (map literal-size (vector->list lit))))]
[(block-variable-literal? lit) 0]
[(##sys#immediate? lit) (bad-literal lit)]
[(##core#inline "C_lambdainfop" lit) 0]
[(##sys#bytevector? lit) (+ 2 (words (##sys#size lit))) ] ; drops "permanent" property!
[(##sys#generic-structure? lit)
(let ([n (##sys#size lit)])
(let loop ([i 0] [s (+ 2 n)])
(if (>= i n)
s
(loop (add1 i) (+ s (literal-size (##sys#slot lit i)))) ) ) ) ]
[else (bad-literal lit)] ) )
(define (gen-lit lit to)
;; we do simple immediate literals directly to avoid a function call:
(cond ((and (fixnum? lit) (not (big-fixnum? lit)))
(gen #t to "=C_fix(" lit ");") )
((block-variable-literal? lit))
((eq? lit (void))
(gen #t to "=C_SCHEME_UNDEFINED;") )
((boolean? lit)
(gen #t to #\= (if lit "C_SCHEME_TRUE" "C_SCHEME_FALSE") #\;) )
((char? lit)
(gen #t to "=C_make_character(" (char->integer lit) ");") )
((symbol? lit) ; handled slightly specially (see C_h_intern_in)
(let* ([str (##sys#slot lit 1)]
[cstr (c-ify-string str)]
[len (##sys#size str)] )
(gen #t to "=")
(gen "C_h_intern(&" to #\, len #\, cstr ");") ) )
((null? lit)
(gen #t to "=C_SCHEME_END_OF_LIST;") )
((and (not (##sys#immediate? lit)) ; nop
(##core#inline "C_lambdainfop" lit)))
((or (fixnum? lit) (not (##sys#immediate? lit)))
(gen #t to "=C_decode_literal(C_heaptop,")
(gen-string-constant (encode-literal lit))
(gen ");") )
(else (bad-literal lit))))
(define (gen-string-constant str)
(let* ([len (##sys#size str)]
[ns (fx/ len 80)]
[srest (modulo len 80)] )
(do ([i ns (sub1 i)]
[offset 0 (+ offset 80)] )
((zero? i)
(when (or (zero? len) (not (zero? srest)))
(gen (c-ify-string (string-like-substring str offset len))) ) )
(gen (c-ify-string (string-like-substring str offset (+ offset 80))) #t) ) ) )
(define (string-like-substring s start end)
(let* ([len (- end start)]
[s2 (make-string len)] )
(##sys#copy-bytes s s2 start 0 len)
s2) )
(define (utype t)
(case t
((fixnum) "int")
((flonum) "double")
((char) "char")
((pointer) "void *")
((int) "int")
((bool) "int")
(else (bomb "invalid unboxed type" t))))
(define (procedures)
(for-each
(lambda (ll)
(let* ((n (lambda-literal-argument-count ll))
(id (lambda-literal-id ll))
(rname (real-name id db))
(demand (lambda-literal-allocated ll))
(rest (lambda-literal-rest-argument ll))
(customizable (lambda-literal-customizable ll))
(empty-closure (and customizable (zero? (lambda-literal-closure-size ll))))
(nec (- n (if empty-closure 1 0)))
(vlist0 (make-variable-list n "t"))
(alist0 (make-argument-list n "t"))
(varlist (intersperse (if empty-closure (cdr vlist0) vlist0) #\,))
(arglist (intersperse (if empty-closure (cdr alist0) alist0) #\,))
(external (lambda-literal-external ll))
(looping (lambda-literal-looping ll))
(direct (lambda-literal-direct ll))
(rest-mode (lambda-literal-rest-argument-mode ll))
(temps (lambda-literal-temporaries ll))
(ubtemps (lambda-literal-unboxed-temporaries ll))
(topname (if unit-name
(string-append unit-name "_toplevel")
"toplevel") ) )
(when empty-closure (debugging 'o "dropping unused closure argument" id))
(gen #t #t)
(gen "/* " (cleanup rname) " */" #t)
(cond [(not (eq? 'toplevel id))
(gen "static ")
(gen (if direct "C_word " "void "))
(if customizable
(gen "C_fcall ")
(gen "C_ccall ") )
(gen id) ]
[else
(gen "static C_TLS int toplevel_initialized=0;")
(unless unit-name
(gen #t "C_main_entry_point") )
(gen #t "C_noret_decl(toplevel_trampoline)"
#t "static void C_fcall toplevel_trampoline(void *dummy) C_regparm C_noret;"
#t "C_regparm static void C_fcall toplevel_trampoline(void *dummy){"
#t "C_" topname "(2,C_SCHEME_UNDEFINED,C_restore);}"
#t #t "void C_ccall C_" topname) ] )
(gen #\()
(unless customizable (gen "C_word c,"))
(when (and direct (not (zero? demand)))
(gen "C_word *a")
(when (pair? varlist) (gen #\,)) )
(apply gen varlist)
(when rest (gen ",..."))
(gen "){")
(when (eq? rest-mode 'none) (set! rest #f))
(gen #t "C_word tmp;")
(if rest
(gen #t "C_word t" n #\;) ; To hold rest-list if demand is met
(begin
(do ([i n (add1 i)]
[j (+ temps (if looping (sub1 n) 0)) (sub1 j)] )
((zero? j))
(gen #t "C_word t" i #\;) )
(for-each
(lambda (ubt)
(gen #t (utype (cdr ubt)) #\space (car ubt) #\;))
ubtemps)))
(cond [(eq? 'toplevel id)
(let ([ldemand (fold (lambda (lit n) (+ n (literal-size lit))) 0 literals)]
[llen (length literals)] )
(gen #t "C_word *a;"
#t "if(toplevel_initialized) C_kontinue(t1,C_SCHEME_UNDEFINED);"
#t "else C_toplevel_entry(C_text(\"" topname "\"));")
(when disable-stack-overflow-checking
(gen #t "C_disable_overflow_check=1;") )
(unless unit-name
(cond [target-initial-heap-size
(gen #t "C_set_or_change_heap_size(" target-initial-heap-size ",1);") ]
[target-heap-size
(gen #t "C_set_or_change_heap_size(" target-heap-size ",1);"
#t "C_heap_size_is_fixed=1;") ] )
(when target-heap-growth
(gen #t "C_heap_growth=" target-heap-growth #\;) )
(when target-heap-shrinkage
(gen #t "C_heap_shrinkage=" target-heap-shrinkage #\;) )
(when target-stack-size
(gen #t "C_resize_stack(" target-stack-size ");") ) )
(gen #t "C_check_nursery_minimum(" demand ");"
#t "if(!C_demand(" demand ")){"
#t "C_save(t1);"
#t "C_reclaim((void*)toplevel_trampoline,NULL);}"
#t "toplevel_initialized=1;")
(gen #t "if(!C_demand_2(" ldemand ")){"
#t "C_save(t1);"
#t "C_rereclaim2(" ldemand "*sizeof(C_word), 1);"
#t "t1=C_restore;}")
(gen #t "a=C_alloc(" demand ");")
(when (not (zero? llen))
(gen #t "C_initialize_lf(lf," llen ");")
(literal-frame)
(gen #t "C_register_lf2(lf," llen ",create_ptable());") ) ) ]
[rest
(gen #t "va_list v;")
(gen #t "C_word *a,c2=c;")
(gen #t "C_save_rest(")
(if (> n 0)
(gen #\t (- n 1))
(gen "c") )
(gen ",c2," n ");")
(when (and (not unsafe) (not no-argc-checks) (> n 2) (not empty-closure))
(gen #t "if(c<" n ") C_bad_min_argc_2(c," n ",t0);") )
(when insert-timer-checks (gen #t "C_check_for_interrupt;"))
(gen #t "if(!C_demand(c*C_SIZEOF_PAIR+" demand ")){") ]
[else
(cond [(and (not direct) (> demand 0))
(if looping
(gen #t "C_word *a;"
#t "loop:"
#t "a=C_alloc(" demand ");")
(gen #t "C_word ab[" demand "],*a=ab;") ) ]
[else
(unless direct (gen #t "C_word *a;"))
(when (and direct (not unsafe) (not disable-stack-overflow-checking))
(gen #t "C_stack_check;") )
(when looping (gen #t "loop:")) ] )
(when (and external (not unsafe) (not no-argc-checks) (not customizable))
;; (not customizable) implies empty-closure
(if (eq? rest-mode 'none)
(when (> n 2) (gen #t "if(c<" n ") C_bad_min_argc_2(c," n ",t0);"))
(gen #t "if(c!=" n ") C_bad_argc_2(c," n ",t0);") ) )
(when (and (not direct) (or external (> demand 0)))
(when insert-timer-checks (gen #t "C_check_for_interrupt;"))
(if (and looping (> demand 0))
(gen #t "if(!C_stack_probe(a)){")
(gen #t "if(!C_stack_probe(&a)){") ) ) ] )
(when (and (not (eq? 'toplevel id))
(not direct)
(or rest external (> demand 0)) )
(cond [rest
(gen #t (if (> nec 0) "C_save_and_reclaim" "C_reclaim") "((void*)tr" n #\r)
(gen ",(void*)" id "r")
(when (> nec 0)
(gen #\, nec #\,)
(apply gen arglist) )
(gen ");}"
#t "else{"
#t "a=C_alloc((c-" n ")*3);")
(gen #t "t" n "=C_restore_rest(a,C_rest_count(0));")
(gen #t id "r(")
(apply gen (intersperse (make-argument-list n "t") #\,))
(gen ",t" n ");}}")
;; Create secondary routine (no demand-check or argument-count-parameter):
(gen #t #t "static void C_ccall " id "r(")
(apply gen varlist)
(gen ",C_word t" n "){")
(gen #t "C_word tmp;")
(do ([i (+ n 1) (+ i 1)]
[j temps (- j 1)] )
((zero? j))
(gen #t "C_word t" i #\;) )
(when (> demand 0) (gen #t "C_word *a=C_alloc(" demand ");")) ]
[else
(gen #t (if (> nec 0) "C_save_and_reclaim" "C_reclaim") "((void*)tr")
(if customizable
(gen id ",NULL")
(gen n ",(void*)" id) )
(when (> nec 0)
(gen #\, nec #\,)
(apply gen arglist) )
(gen ");}") ] ) )
(expression
(lambda-literal-body ll)
(if rest
(add1 n) ; One temporary is needed to hold the rest-list
n)
ll)
(gen #\}) ) )
lambdas) )
(debugging 'p "code generation phase...")
(set! output out)
(header)
(declarations)
(generate-external-variables external-variables)
(generate-foreign-stubs foreign-lambda-stubs db)
(prototypes)
(generate-foreign-callback-stubs foreign-callback-stubs db)
(trampolines)
(procedures)
(emit-procedure-table-info lambdas source-file)
(trailer) ) )
;;; Emit procedure table:
(define (emit-procedure-table-info lambdas sf)
(gen #t #t "#ifdef C_ENABLE_PTABLES"
#t "static C_PTABLE_ENTRY ptable[" (add1 (length lambdas)) "] = {")
(do ((ll lambdas (cdr ll)))
((null? ll)
(gen #t "{NULL,NULL}};") )
(let ((id (lambda-literal-id (car ll))))
(gen #t "{\"" id #\: (string->c-identifier sf) "\",(void*)")
(if (eq? 'toplevel id)
(if unit-name
(gen "C_" unit-name "_toplevel},")
(gen "C_toplevel},") )
(gen id "},") ) ) )
(gen #t "#endif")
(gen #t #t "static C_PTABLE_ENTRY *create_ptable(void)")
(gen "{" #t "#ifdef C_ENABLE_PTABLES"
#t "return ptable;"
#t "#else"
#t "return NULL;"
#t "#endif"
#t "}") )
;;; Create name that is safe for C comments:
(define (cleanup s)
(let ([s2 #f]
[len (string-length s)] )
(let loop ([i 0])
(if (>= i len)
(or s2 s)
(let ([c (string-ref s i)])
(if (or (char<? c #\space)
(char>? c #\~)
(and (char=? c #\*) (< i (sub1 len)) (char=? #\/ (string-ref s (add1 i)))) )
(begin
(unless s2 (set! s2 (string-copy s)))
(string-set! s2 i #\~) )
(when s2 (string-set! s2 i c)) )
(loop (add1 i)) ) ) ) ) )
;;; Create list of variables/parameters, interspersed with a special token:
(define (make-variable-list n prefix)
(list-tabulate
n
(lambda (i) (string-append "C_word " prefix (number->string i))) ) )
(define (make-argument-list n prefix)
(list-tabulate
n
(lambda (i) (string-append prefix (number->string i))) ) )
;;; Generate external variable declarations:
(define (generate-external-variables vars)
(gen #t)
(for-each
(lambda (v)
(let ((name (vector-ref v 0))
(type (vector-ref v 1))
(exported (vector-ref v 2)) )
(gen #t (if exported "" "static ") (foreign-type-declaration type name) #\;) ) )
vars) )
;;; Generate foreign stubs: