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mescc: Have micro-mes print argc. 

* module/language/c99/compiler.mes (accu->ident): New function.
  (statement->text+symbols+locals): Use it to implement initialization
  with immediate, local.
  (_start): Call main with argc,argv [WAS: 0,0].
* module/mes/libc-i386.mes (i386:push-accu, i386:accu->local): New
  functions.
* module/mes/libc-i386.scm: Export them.
* doc/examples/micro-mes.c (main): Return argc as exit status.
This commit is contained in:
Jan Nieuwenhuizen 2017-01-03 12:52:59 +01:00
parent b93d5188ea
commit 01177f7324
4 changed files with 134 additions and 5 deletions
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56
module/language/c99/compiler.mes
View File

@ -112,6 +112,10 @@
(lambda (o)
(i386:local->accu (assoc-ref locals o))))
(define (accu->ident locals)
(lambda (o)
(i386:accu->local (assoc-ref locals o))))
(define (ident->base locals)
(lambda (o)
(i386:local->base (assoc-ref locals o))))
@ -225,6 +229,20 @@
symbols
locals)))
((array-ref (p-expr (fixed ,value)) (p-expr (ident ,name)))
(let ((value (string->number value)))
(make-text+symbols+locals
(append
text
(list
(lambda (s t d)
(append
((ident->base locals) name)
(i386:local-assign (assoc-ref locals name) value)
(i386:mem-byte->accu)))))
symbols
locals)))
((array-ref (p-expr (ident ,name)) (p-expr (ident ,index)))
(make-text+symbols+locals
(append
@ -251,6 +269,29 @@
symbols
locals))
((decl (decl-spec-list (type-spec (fixed-type ,type))) (init-declr-list (init-declr (ident ,name) (initzer (p-expr (ident ,local))))))
(let ((locals (acons name (1+ (or (and=> (member 1 (map cdr locals)) length) 0)) locals)))
(make-text+symbols+locals
(append
text
(list (lambda (s t d)
((ident->accu locals) local)
((accu->ident locals) name))))
symbols
locals)))
((decl (decl-spec-list (type-spec (typename ,type))) (init-declr-list (init-declr (ident ,name) (initzer (p-expr (ident ,local))))))
(let ((locals (acons name (1+ (or (and=> (member 1 (map cdr locals)) length) 0)) locals)))
(make-text+symbols+locals
(append
text
((ident->accu locals) name)
(list (lambda (s t d)
((ident->accu locals) local)
((accu->ident locals) name))))
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)))
@ -360,8 +401,19 @@
((statement->text+symbols+locals text+symbols+locals) (car statements)))))))))
(define _start
(let* ((ast (with-input-from-string
"int _start () {int i;i=main (0,0);exit (i);}"
(let* ((argc-argv
(string-append ".byte"
" 0x89 0xe8" ; mov %ebp,%eax
" 0x83 0xc0 0x08" ; add $0x8,%eax
" 0x50" ; push %eax
" 0x89 0xe8" ; mov %ebp,%eax
" 0x83 0xc0 0x04" ; add $0x4,%eax
" 0x0f 0xb6 0x00" ; movzbl (%eax),%eax
" 0x50" ; push %eax
))
(ast (with-input-from-string
(string-append "int _start () {int i;asm(\"" argc-argv "\");i=main ();exit (i);}")
parse-c99))
(functions (filter ast:function? (cdr ast))))
;;(pretty-print ast (current-error-port))

75
module/mes/libc-i386.mes
View File

@ -44,6 +44,9 @@
(define (i386:ref-local n)
`(#xff #x75 ,(- 0 (* 4 n)))) ; pushl 0x<n>(%ebp)
(define (i386:push-accu)
`(#x50)) ; push %eax
(define (i386:push-arg s t d)
(lambda (o)
(cond ((number? o)
@ -65,6 +68,9 @@
#xc3 ; ret
)))
(define (i386:accu->local n)
`(#x89 #x45 ,(- 0 (* 4 n)))) ; mov ,%eax,-<0xn>(%ebp)
(define (i386:local->accu n)
`(#x8b #x45 ,(- 0 (* 4 n)))) ; mov -<0xn>(%ebp),%eax
@ -105,6 +111,26 @@
#xcd #x80 ; int $0x80
))
;; (define (i386:_start s t d)
;; (let* ((prefix
;; `(
;; #x55 ; push %ebp
;; #x89 #xe5 ; mov %esp,%ebp
;; ;;#x83 #xec #x10 ; sub $0x10,%esp -- 4 local vars
;; #xe8 ,@(int->bv32 (- address 5 s)) ; call relative
;; #xb8 #x04 #x00 #x00 #x00 ; mov $0x4,%eax
;; #xcd #x80 ; int $0x80
;; #xc9 ; leave
;; #xc3 ; ret
;; ))
;; (text-list (text->list t))
;; (statement-offset (- (+ (length prefix) (length text-list))))
;; (address (+ t (function-offset "main" s))))))
(define (i386:write s t d)
`(
#x55 ; push %ebp
@ -127,3 +153,52 @@
(define (i386:test-jump n)
`(#x84 #xc0 ; test %al,%al
#x75 ,(if (>= n 0) n (- n 4)))) ; jne <n>
#!
int
strcmp (char const* a, char const* b)
{
while (*a && *b && *a == *b) {*a++;b++;}
return *a == *b;
}
08048150 <strcmp>:
8048150: 55 push %ebp
8048151: 89 e5 mov %esp,%ebp
8048153: eb 0d jmp 8048162 <strcmp+0x12>
<body>
8048155: 8b 45 08 mov 0x8(%ebp),%eax
8048158: 83 c0 01 add $0x1,%eax
804815b: 89 45 08 mov %eax,0x8(%ebp)
804815e: 83 45 0c 01 addl $0x1,0xc(%ebp)
<test>
8048162: 8b 45 08 mov 0x8(%ebp),%eax
8048165: 0f b6 00 movzbl (%eax),%eax
8048168: 84 c0 test %al,%al
804816a: 74 1a je 8048186 <strcmp+0x36>
804816c: 8b 45 0c mov 0xc(%ebp),%eax
804816f: 0f b6 00 movzbl (%eax),%eax
8048172: 84 c0 test %al,%al
8048174: 74 10 je 8048186 <strcmp+0x36>
8048176: 8b 45 08 mov 0x8(%ebp),%eax
8048179: 0f b6 10 movzbl (%eax),%edx
804817c: 8b 45 0c mov 0xc(%ebp),%eax
804817f: 0f b6 00 movzbl (%eax),%eax
8048182: 38 c2 cmp %al,%dl
8048184: 74 cf je 8048155 <strcmp+0x5>
<done>
8048186: 8b 45 08 mov 0x8(%ebp),%eax
8048189: 0f b6 10 movzbl (%eax),%edx
804818c: 8b 45 0c mov 0xc(%ebp),%eax
804818f: 0f b6 00 movzbl (%eax),%eax
8048192: 38 c2 cmp %al,%dl
8048194: 0f 94 c0 sete %al
8048197: 0f b6 c0 movzbl %al,%eax
804819a: 5d pop %ebp
804819b: c3 ret
!#

3
module/mes/libc-i386.scm
View File

@ -27,7 +27,8 @@
(define-module (mes libc-i386)
#:use-module (srfi srfi-1)
#:use-module (mes elf)
#:export (i386:call
#:export (i386:accu->local
i386:call
i386:exit
i386:formal
i386:function-preamble

5
scaffold/micro-mes.c
View File

@ -124,8 +124,8 @@ strlen (char const* s)
int
strcmp (char const* a, char const* b)
{
while (*a && *b && *a == *b) {*a++;b++;}
return *a == *b;
while (*a && *b && *a == *b) {a++;b++;}
return *a - *b;
}
int
@ -216,6 +216,7 @@ main (int argc, char *argv[])
eputs ("Strlen...\n");
puts ("Bye micro\n");
int i = strlen ("02013");
int i = argc;
return i;
}