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mescc: Formals, local variables.

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* module/language/c99/compiler.mes (statement->text+symbols+locals):
  Rename from statement->text+symbols.  Handle locals.
  (formals->text): Add proper function preamble.
  (formals->locals): Add formals as locals.
  (expr->accu, ident->accu, ident->base, ident-ref, global-ref): New
  functions.
  (strlen, eputs, fputs, puts): New functions.
  (libc): New variable.
  (i386:libc): Rename from libc.  Remove eputs and puts.
* module/mes/libc-i386.mes (i386:eputs, i386:puts: Remove.
  (i386:call, i386:ret): Handle locals as argument.
  (i386:function-locals, i386:function-preamble, i386:jump,
  i386:local->accu, i386:local-add, i386:local-assign,
  i386:local->base, i386:ref-global, i386:ref-local, i386:ret-local,
  i386:mem-byte->accu, i386:test-jump, i386:write): New functions.
* module/mes/libc-i386.scm: Export them.
This commit is contained in:
Jan Nieuwenhuizen 2017-01-02 23:21:33 +01:00
parent 57e11b3147
commit 109cbdd1e7
4 changed files with 422 additions and 130 deletions
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329
module/language/c99/compiler.mes
View file

@ -36,6 +36,14 @@
(mes-use-module (mes elf))
(mes-use-module (mes libc-i386))))
(define (logf port string . rest)
(apply format (cons* port string rest))
(force-output port)
#t)
(define (stderr string . rest)
(apply logf (cons* (current-error-port) string rest)))
(define (gnuc-xdef? name mode) (if (equal? name "__GNUC__") #f (eq? mode 'code)))
;;(define (gnuc-xdef? name mode) (equal? name "__GNUC__"))
;; (define (gnuc-xdef? name mode)
@ -58,67 +66,215 @@
(define (.name o)
(pmatch o
((fctn-defn _ (ftn-declr (ident ,name) _) _) name)
((fctn-defn _ (ptr-declr (pointer) (ftn-declr (ident ,name) _)) _) name)))
((fctn-defn _ (ptr-declr (pointer) (ftn-declr (ident ,name) _)) _) name)
((param-decl _ (param-declr (ident ,name))) name)
((param-decl _ (param-declr (ptr-declr (pointer) (ident ,name)))) name)
((param-decl _ (param-declr (ptr-declr (pointer) (array-of (ident ,name))))) name)
(_
(format (current-error-port) "SKIP .name =~a\n" o))))
(define (.statements o)
(pmatch o
((fctn-defn _ (ftn-declr (ident ,name) _) (compd-stmt (block-item-list . ,statements))) statements)
((fctn-defn _ (ptr-declr (pointer) (ftn-declr (ident ,name) _)) (compd-stmt (block-item-list . ,statements))) statements)))
(define (expr->arg symbols) ;; FIXME: get Mes curried-definitions
(define (ident-ref locals)
(lambda (o)
(i386:ref-local (assoc-ref locals o))))
(define (global-ref symbols)
(lambda (o)
(lambda (s t d)
(i386:ref-global (+ (data-offset o symbols) d)))))
(define (expr->arg symbols locals) ;; FIXME: get Mes curried-definitions
(lambda (o)
(pmatch o
((p-expr (fixed ,value)) (string->number value))
((p-expr (string ,string)) (data-offset symbols string))
((p-expr (string ,string)) ((global-ref symbols) string))
((p-expr (ident ,name)) ((ident-ref locals) name))
(_
(format (current-error-port) "SKIPPING expr=~a\n" o)
(format (current-error-port) "SKIP expr->arg=~a\n" o)
0))))
(define (ident->accu locals)
(lambda (o)
(i386:local->accu (assoc-ref locals o))))
(define (ident->base locals)
(lambda (o)
(i386:local->base (assoc-ref locals o))))
;; (define (global-accu symbols)
;; (lambda (o)
;; (lambda (s t d)
;; (i386:accu-global (+ (data-offset o symbols) d)))))
(define (expr->accu symbols locals)
(lambda (o)
(pmatch o
((p-expr (fixed ,value)) (string->number value))
((p-expr (ident ,name)) ((ident->accu locals) name))
(_
(format (current-error-port) "SKIP expr-accu=~a\n" o)
0)
)))
(define (expr->symbols o)
(pmatch o
((p-expr (string ,string)) (string->symbols string))
(_ #f)))
(define make-text+symbols cons)
(define make-text+symbols+locals cons*)
(define .text car)
(define .symbols cdr)
(define .symbols cadr)
(define .locals cddr)
(define (dec->hex o)
(number->string o 16))
(define (statement->text+symbols text+symbols)
(define (text->list o)
(append-map (lambda (f) (f '() 0 0)) o))
(define (statement->text+symbols+locals text+symbols+locals)
(lambda (o)
(let* ((text (.text text+symbols))
(symbols (.symbols text+symbols))
(text-list (append-map (lambda (f) (f '() 0 0)) text))
;;(stderr "S=~a\n" o)
(let* ((text (.text text+symbols+locals))
(symbols (.symbols text+symbols+locals))
(locals (.locals text+symbols+locals))
(text-list (text->list text))
(prefix-list (symbols->text symbols 0 0))
(statement-offset (- (+ (length prefix-list) (length text-list)))))
;; (stderr " tsl=~a\n" text+symbols+locals)
;; (stderr " locals=~s\n" locals)
(pmatch o
((expr-stmt (fctn-call (p-expr (ident ,name))
(expr-list (p-expr (string ,string)))))
(make-text+symbols
;;(stderr "S1 string=~a\n" string)
(make-text+symbols+locals
(append text
(list (lambda (s t d)
(i386:call (+ t
(function-offset name s)
statement-offset)
(+ d (data-offset string s))))))
(append symbols (list (string->symbols string)))));; FIXME: ->symbolSXX
(i386:call s t d
(+ t (function-offset name s)
statement-offset)
(+ d (data-offset string s))))))
(append symbols (list (string->symbols string)))
locals))
((expr-stmt (fctn-call (p-expr (ident ,name)) (expr-list . ,expr-list)))
(let ((args (map (expr->arg symbols) expr-list)))
(make-text+symbols
;;(stderr "S1 expr-list=~a\n" expr-list)
(let* ((symbols (append symbols (filter-map expr->symbols expr-list)))
(args (map (expr->arg symbols locals) expr-list)))
(make-text+symbols+locals
(append text
(list (lambda (s t d) (apply i386:call (cons (+ t (function-offset name s) statement-offset) args)))))
(append symbols (filter-map expr->symbols expr-list)))))
(list (lambda (s t d) (apply i386:call (cons* s t d (+ t (function-offset name s) statement-offset) args)))))
symbols
locals)))
((return (p-expr (fixed ,value)))
((while ,test ,body)
(let* ((t+s+l (make-text+symbols+locals '() symbols locals))
(body-t+s+l ((statement->text+symbols+locals t+s+l) body))
(body-text (.text body-t+s+l))
;;(body-symbols (.symbols body-t+s+l))
(symbols (.symbols body-t+s+l))
(body-locals (.locals body-t+s+l))
(body-length (length (text->list body-text)))
(test-t+s+l ((statement->text+symbols+locals t+s+l) test))
(test-text (.text test-t+s+l))
(test-symbols (.symbols test-t+s+l))
(test-locals (.locals test-t+s+l))
(test-length (length (text->list test-text))))
(make-text+symbols+locals
(append text
(list (lambda (s t d) (i386:jump body-length)))
body-text
test-text
(list (lambda (s t d) (i386:test-jump (- (+ body-length test-length))))))
symbols
locals)))
((array-ref (p-expr (ident ,name)) (p-expr (ident ,index)))
(make-text+symbols+locals
(append
text
(list
(lambda (s t d)
(append
((ident->base locals) name)
((ident->accu locals) index)
(i386:mem-byte->accu)))))
symbols
locals))
((expr-stmt (post-inc (p-expr (ident ,name))))
(make-text+symbols+locals
(append text
(list (lambda (s t d) (i386:local-add (assoc-ref locals name) 1))))
symbols
locals))
((return ,expr)
(make-text+symbols+locals
(append text (list (i386:ret ((expr->accu symbols locals) expr))))
symbols
locals))
((decl (decl-spec-list (type-spec (fixed-type ,type))) (init-declr-list (init-declr (ident ,name))))
(let ((locals (acons name (1+ (or (and=> (member 1 (map cdr locals)) length) 0)) locals)))
(make-text+symbols+locals text symbols locals)))
((decl (decl-spec-list (type-spec (fixed-type ,type))) (init-declr-list (init-declr (ident ,name) (initzer (p-expr (fixed ,value))))))
(let ((locals (acons name (1+ (or (and=> (member 1 (map cdr locals)) length) 0)) locals))
(value (string->number value)))
(make-text+symbols+locals
(append
text
(list (lambda (s t d) (i386:local-assign (assoc-ref locals name) value))))
symbols
locals)))
((decl (decl-spec-list (type-spec (fixed-type ,type))) (init-declr-list (init-declr (ident ,name) (initzer (fctn-call . ,call)))))
(let ((locals (acons name (1+ (or (and=> (member 1 (map cdr locals)) length) 0)) locals)))
(let* ((t+s+l (make-text+symbols+locals text symbols locals))
(t+s+l ((statement->text+symbols+locals t+s+l)
`(expr-stmt (fctn-call ,@call))))
(text (.text t+s+l))
(symbols (.symbols t+s+l))
(locals (.locals t+s+l)))
(make-text+symbols+locals
(append
text
(list (lambda (s t d) (i386:ret-local (assoc-ref locals name)))))
symbols
locals))))
((expr-stmt (assn-expr (p-expr (ident ,name)) (op _) (p-expr (fixed ,value))))
(stderr "RET LOCAL[~a]: ~a\n" name (assoc-ref locals name))
(let ((value (string->number value)))
(make-text+symbols (append text (list (lambda _ (i386:ret value)))) symbols)))
(make-text+symbols+locals
(append text (list (lambda (s t d) (i386:local-assign (assoc-ref locals name) value))))
symbols
locals)))
((expr-stmt (assn-expr (p-expr (ident ,name)) (op _) (fctn-call . ,call)))
(let* ((t+s+l ((statement->text+symbols+locals text+symbols+locals)
`(expr-stmt (fctn-call ,@call))))
(text (.text t+s+l))
(symbols (.symbols t+s+l))
(locals (.locals t+s+l)))
(make-text+symbols+locals
(append text (list (lambda (s t d) (i386:ret-local (assoc-ref locals name)))))
symbols
locals)))
(_
(format (current-error-port) "SKIPPING S=~a\n" o)
text+symbols)))))
(format (current-error-port) "SKIP statement=~a\n" o)
text+symbols+locals)))))
(define (symbols->exe symbols)
(display "dumping elf\n" (current-error-port))
@ -133,58 +289,139 @@
(define (formal->text n)
(lambda (o i)
(case i
((0) (list #x8b #x5d (* n 4))) ; mov $00(%ebp),%ebx
((1) (list #x8b #x4d (* (- n 1) 4))) ; mov $00(%ebp),%ecx
((2) (list #x8b #x55 (* (- n 2) 4))) ; mov $00(%ebp),%edx
((3) (list #x8b #x45 (* (- n 3) 4)))))) ; mov $00(%ebp),%eax FIXME
;;(i386:formal i n)
'()
))
(define (formals->text o)
(pmatch o
((param-list . ,formals)
(let ((n (length formals)))
(list (lambda (s t d)
(append
'(#x55 ; push %ebp
#x89 #xe5) ; mov %esp,%ebp
(append-map (formal->text n) formals (iota n))
'(#x83 #xec #x10) ; sub $0x10,%esp -- 4 local vars
)))))
(_ (format (current-error-port) "formals->text+data: no match: ~a\n" o)
(append
(i386:function-preamble)
(append-map (formal->text n) formals (iota n))
(i386:function-locals))))))
(_ (format (current-error-port) "formals->text: no match: ~a\n" o)
barf)))
(define (formals->locals o)
(pmatch o
((param-list . ,formals)
(let ((n (length formals)))
(map cons (map .name formals) (iota n (1- (- n))))))
(_ (format (current-error-port) "formals->symbols: no match: ~a\n" o)
barf)))
(define (string->symbols string)
(make-data string (string->list string)))
(make-data string (append (string->list string) (list #\nul))))
(define (function->symbols symbols)
(lambda (o)
(format (current-error-port) "compiling ~a\n" (.name o))
;;(stderr "formals=~a\n" (.formals o))
(let* ((text (formals->text (.formals o)))
(locals (formals->locals (.formals o)))
(text-offset (length (symbols->text symbols 0 0))))
(let loop ((statements (.statements o))
(text+symbols (make-text+symbols text symbols)))
(if (null? statements) (append (.symbols text+symbols) (list (make-function (.name o) (.text text+symbols))))
(text+symbols+locals (make-text+symbols+locals text symbols locals)))
(if (null? statements) (append (.symbols text+symbols+locals) (list (make-function (.name o) (.text text+symbols+locals))))
(let* ((statement (car statements)))
(loop (cdr statements)
((statement->text+symbols text+symbols) (car statements)))))))))
((statement->text+symbols+locals text+symbols+locals) (car statements)))))))))
(define _start
(let* ((ast (with-input-from-string
"int _start () {main(0,0);exit (0);}"
"int _start () {int i;i=main (0,0);exit (i);}"
parse-c99))
(functions (filter ast:function? (cdr ast))))
;;(pretty-print ast (current-error-port))
(list (find (lambda (x) (equal? (.name x) "_start")) functions))))
(define libc
(define strlen
(let* ((ast (with-input-from-string
"
int
strlen (char const* s)
{
int i = 0;
while (s[i]) i++;
return i;
}
"
parse-c99))
(functions (filter ast:function? (cdr ast))))
;;(pretty-print ast (current-error-port))
(list (find (lambda (x) (equal? (.name x) "strlen")) functions))))
(define eputs
(let* ((ast (with-input-from-string
"
int
eputs (char const* s)
{
//write (STDERR, s, strlen (s));
//write (2, s, strlen (s));
int i = strlen (s);
write (2, s, i);
return 0;
}
"
parse-c99))
(functions (filter ast:function? (cdr ast))))
;;(pretty-print ast (current-error-port))
(list (find (lambda (x) (equal? (.name x) "eputs")) functions))))
(define fputs
(let* ((ast (with-input-from-string
"
int
fputs (char const* s, int fd)
{
int i = strlen (s);
write (fd, s, i);
return 0;
}
"
parse-c99))
(functions (filter ast:function? (cdr ast))))
;;(pretty-print ast (current-error-port))
(list (find (lambda (x) (equal? (.name x) "fputs")) functions))))
(define puts
(let* ((ast (with-input-from-string
"
int
puts (char const* s)
{
//write (STDERR, s, strlen (s));
//int i = write (STDERR, s, strlen (s));
int i = strlen (s);
write (1, s, i);
return 0;
}
"
parse-c99))
(functions (filter ast:function? (cdr ast))))
;;(pretty-print ast (current-error-port))
(list (find (lambda (x) (equal? (.name x) "puts")) functions))))
(define i386:libc
(list
(make-function "eputs" (list i386:eputs))
(make-function "exit" (list i386:exit))
(make-function "puts" (list i386:puts))))
(make-function "write" (list i386:write))))
(define libc
(append
strlen
eputs
fputs
puts))
(define (compile)
(let* ((ast (mescc))
(functions (filter ast:function? (cdr ast)))
(functions (append functions _start)))
(let loop ((functions functions) (symbols libc))
(functions (append libc functions _start)))
(let loop ((functions functions) (symbols i386:libc))
(if (null? functions) (symbols->exe symbols)
(loop (cdr functions) ((function->symbols symbols) (car functions)))))))

137
module/mes/libc-i386.mes
View file

@ -24,45 +24,71 @@
;;; Code:
(define (push-arg o)
`(#x68 ,@(int->bv32 o))) ; push o
(define (i386:function-preamble)
'(#x55 ; push %ebp
#x89 #xe5)) ; mov %esp,%ebp
(define (i386:function-locals)
'(#x83 #xec #x10)) ; sub $0x10,%esp -- 4 local vars
;; (define (i386:formal i n)
;; (case i
;; ((0) (list #x8b #x5d (* (- n 2) 4))) ; mov $00(%ebp),%ebx
;; ((1) (list #x8b #x4d (* (- n 3) 4))) ; mov $00(%ebp),%ecx
;; ((2) (list #x8b #x55 (* (- n 4) 4))) ; mov $00(%ebp),%edx
;; ((3) (list #x8b #x45 (* (- n 5) 4))))) ; mov $00(%ebp),%eax FIXME
(define (i386:ref-global o)
`(#x68 ,@(int->bv32 o))) ; push $0x<o>
(define (i386:ref-local n)
`(#xff #x75 ,(- 0 (* 4 n)))) ; pushl 0x<n>(%ebp)
(define (i386:push-arg s t d)
(lambda (o)
(cond ((number? o)
`(#x68 ,@(int->bv32 o))) ; push $<o>
((pair? o) o)
((procedure? o) (o s t d)))))
(define (i386:ret . rest)
(lambda (s t d)
`(
,@(cond ((null? rest) '())
((number? (car rest))
`(#xb8 ; mov $<>,%eax
,@(int->bv32 (car rest))))
((pair? (car rest)) (car rest))
((procedure? (car rest))
((car rest) s t d)))
#xc9 ; leave
#xc3 ; ret
)))
(define (i386:local->accu n)
`(#x8b #x45 ,(- 0 (* 4 n)))) ; mov -<0xn>(%ebp),%eax
(define (i386:local->base n)
`(#x8b #x55 ,(- 0 (* 4 n)))) ; mov -<0xn>(%ebp),%edx
(define (i386:mem-byte->accu)
'(#x01 #xd0 ; add %edx,%eax
#x0f #xb6 #x00)) ; movzbl (%eax),%eax
(define (i386:local-add n v)
`(#x83 #x45 ,(- 0 (* 4 n)) ,v)) ; addl $<v>,0x<n>(%ebp)
(define (i386:local-assign n v)
`(#xc7 #x45 ,(- 0 (* 4 n)) ; movl $<v>,0x<n>(%ebp)
,@(int->bv32 v)))
(define (i386:ret-local n)
`(
,@(if (null? rest) '()
`(#xb8 ; mov $00,%eax
,@(int->bv32 (car rest))))
#xc9 ; leave
#xc3 ; ret
#x89 #x45 ,(- 0 (* 4 n)) ; mov %eax,-0x<n>(%ebp)
))
;; #x83 #xec #x10 ; sub $0x10,%esp
;; #x8b #x45 #x04 ; mov 0x4(%ebp),%eax
;; #x8b #x5d #x04 ; mov 0x4(%ebp),%ebx
;; #x8b #x45 #x08 ; mov 0x8(%ebp),%eax
;; #x8b #x4d #x04 ; mov 0xc(%ebp),%ecx
;; #x8b #x5d #x08 ; mov 0x4(%ebp),%ebx
;; #x8b #x45 #x0c ; mov 0x8(%ebp),%eax
;; #x8b #x55 #xfc ; mov 0x4(%ebp),%edx
;; #x8b #x5d #x08 ; mov $0x8(%ebp),%ebx
;; #x8b #x4d #x08 ; mov $0x8(%ebp),%ecx
;; #x8b #x5d #x0c ; mov $0xc(%ebp),%ebx
;; #x8b #x55 #x08 ; mov $0x8(%ebp),%edx
;; #x8b #x4d #x0c ; mov $0xc(%ebp),%ecx
;; #x8b #x5d #x10 ; mov $0x10(%ebp),%ebx
(define (i386:call address . arguments)
(let* ((pushes (append-map push-arg arguments))
(define (i386:call s t d address . arguments)
(let* ((pushes (append-map (i386:push-arg s t d) arguments))
(s (length pushes))
(n (length arguments)))
`(
@ -71,52 +97,33 @@
#x83 #xc4 ,(* n 4) ; add $00,%esp
)))
(define (i386:eputs s t d)
`(
#x55 ; push %ebp
#x89 #xe5 ; mov %esp,%ebp
;;;#x59 ; pop %ecx
#x8b #x4d #x08 ; mov $0x8(%ebp),%ecx
;;#x8b #x5d #x0c ; mov $0xc(%ebp),%ebx
#xba #x01 #x00 #x00 #x00 ; mov $0x1,%edx
#xbb #x02 #x00 #x00 #x00 ; mov $0x1,%ebx
#xb8 #x04 #x00 #x00 #x00 ; mov $0x4,%eax
#xcd #x80 ; int $0x80
#xc9 ; leave
#xc3 ; ret
))
(define (i386:exit s t d)
`(
#x5b ; pop %ebx
#x5b ; pop %ebx
;; FIXME: hack to get return value 41
;; without local variable support in _start
#x89 #xc3 ; mov %eax,%ebx
#xb8 #x01 #x00 #x00 #x00 ; mov $0x1,%eax
#xcd #x80 ; int $0x80
))
(define (i386:puts s t d)
(define (i386:write s t d)
`(
#x55 ; push %ebp
#x89 #xe5 ; mov %esp,%ebp
#x8b #x4d #x08 ; mov $0x8(%ebp),%ecx
;; #x8b #x5d #x0c ; mov $0xc(%ebp),%ebx
#x8b #x5d #x10 ; mov $0x8(%ebp),%ebx
#x8b #x4d #x0c ; mov $0xc(%ebp),%ecx
#x8b #x55 #x08 ; mov $0x4(%ebp),%edx
#xba #x0a #x00 #x00 #x00 ; mov $0xa,%edx
;; #x59 ; pop %ecx
#xbb #x01 #x00 #x00 #x00 ; mov $0x1,%ebx
#xb8 #x04 #x00 #x00 #x00 ; mov $0x4,%eax
#xcd #x80 ; int $0x80
#xc9 ; leave
#xc3 ; ret
))
(define (i386:jump n)
`(#xeb ,(if (>= n 0) n (- n 2)))) ; jmp <n>
(define (i386:test-jump n)
`(#x84 #xc0 ; test %al,%al
#x75 ,(if (>= n 0) n (- n 4)))) ; jne <n>

17
module/mes/libc-i386.scm
View file

@ -1,7 +1,7 @@
;;; -*-scheme-*-
;;; Mes --- Maxwell Equations of Software
;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
;;; Copyright © 2016,2017 Jan Nieuwenhuizen <janneke@gnu.org>
;;;
;;; This file is part of Mes.
;;;
@ -29,10 +29,23 @@
#:use-module (mes elf)
#:export (i386:call
i386:exit
i386:for
i386:formal
i386:function-preamble
i386:function-locals
i386:eputs
i386:jump
i386:local-add
i386:local-assign
i386:local->accu
i386:local->base
i386:mem-byte->accu
i386:puts
i386:ref-global
i386:ref-local
i386:ret
i386:ret-local
i386:test-jump
i386:write
))
(cond-expand

69
scaffold/micro-mes.c
View file

@ -1,6 +1,6 @@
/* -*-comment-start: "//";comment-end:""-*-
* Mes --- Maxwell Equations of Software
* Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
* Copyright © 2016,2017 Jan Nieuwenhuizen <janneke@gnu.org>
*
* This file is part of Mes.
*
@ -148,6 +148,27 @@ eputs (char const* s)
return 0;
}
int g_a;
int g_b;
#if 0
void
eputs2 (char const* s, int a)
{
g_a = a;
write (STDERR, s, strlen (s));
//return 0;
}
void
eputs3 (char const* s, int a, int b)
{
g_a = a;
g_b = b;
write (STDERR, s, strlen (s));
//return 0;
}
char const*
itoa (int x)
{
@ -170,6 +191,7 @@ itoa (int x)
return p+1;
}
#endif
void
assert_fail (char* s)
@ -191,28 +213,41 @@ int
main (int argc, char *argv[])
{
puts ("Hello main!\n");
//eputs (itoa (123));
eputs ("\n");
puts ("Bye micro!!\n");
//assert(!"boo");
return 41;
eputs ("Strlen...\n");
puts ("Bye micro\n");
int i = strlen ("02013");
return i;
}
#if __GNUC__
// int
// test1()
// {
// return 9;
// }
// void
// test()
// {
// int r;
// r=7;
// r=test1();
// }
void
_start ()
{
puts ("Hello micro-mes!\n");
int r;
asm (
"push $0\n\t"
"push $0\n\t"
"call main\n\t"
"movl %%eax,%0\n\t"
: "=r" (r)
: //no inputs "" (&main)
);
exit (r);
int i;
i = main (0,0);
// asm (
// "push $0\n\t"
// "push $0\n\t"
// "call main\n\t"
// "movl %%eax,%0\n\t"
// : "=r" (r)
// : //no inputs "" (&main)
// );
exit (i);
}
#endif