mes/module/language/c99/compiler.mes

;;; -*-scheme-*-

;;; Mes --- Maxwell Equations of Software
;;; Copyright © 2016,2017,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
;;;
;;; This file is part of Mes.
;;;
;;; Mes is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; Mes is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with Mes.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;;; compiler.mes produces an i386 binary from the C produced by
;;; Nyacc c99.

;;; Code:

(cond-expand
 (guile-2)
 (guile)
 (mes
  (mes-use-module (srfi srfi-1))
  (mes-use-module (srfi srfi-26))
  (mes-use-module (mes pmatch))
  (mes-use-module (nyacc lang c99 parser))
  (mes-use-module (nyacc lang c99 pprint))
  (mes-use-module (mes as))
  (mes-use-module (mes as-i386))
  (mes-use-module (mes M1))
  (mes-use-module (mes optargs))
  (mes-use-module (language c99 info))))

(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 (pke . stuff)
  (newline (current-error-port))
  (display ";;; " (current-error-port))
  (write stuff (current-error-port))
  (newline (current-error-port))
  (car (last-pair stuff)))

(define %prefix (if (string-prefix? "@PREFIX" "@PREFIX@") (or (getenv "PREFIX") "") "@PREFIX@"))

(define mes? (pair? (current-module)))

(define %int-size 4)
(define %pointer-size %int-size)

(define* (c99-input->full-ast #:key (defines '()) (includes '()))
  (let ((sys-include (if (equal? %prefix "") "include" (string-append %prefix "/share/include"))))
    (parse-c99
     #:inc-dirs (append includes (cons* sys-include "include" "lib" (or (and=> (getenv "C_INCLUDE_PATH") (cut string-split <> #\:)) '())))
     #:cpp-defs `(
                  "NULL=0"
                  "__linux__=1"
                  "__i386__=1"
                  "POSIX=0"
                  "_POSIX_SOURCE=0"
                  "__MESC__=1"
                  ,(if mes? "__MESC_MES__=1" "__MESC_MES__=0")
                  ,@defines)
     #:mode 'code)))

(define (ast-strip-comment o)
  (pmatch o
    ((comment . ,comment) #f)
    (((comment . ,comment) . ,t) (filter-map ast-strip-comment t))
    (((comment . ,comment) . ,cdr) cdr)
    ((,car . (comment . ,comment)) car)
    ((,h . ,t) (if (list? o) (filter-map ast-strip-comment o)
                   (cons (ast-strip-comment h) (ast-strip-comment t))))
    (_  o)))

(define (ast-strip-const o)
  (pmatch o
    ((type-qual ,qual) (if (equal? qual "const") #f o))
    ((pointer (type-qual-list (type-qual ,qual)) . ,rest)
     (if (equal? qual "const") `(pointer ,@rest) o))
    ((decl-spec-list (type-qual ,qual))
     (if (equal? qual "const") #f
         `(decl-spec-list (type-qual ,qual))))
    ((decl-spec-list (type-qual ,qual) . ,rest)
     (if (equal? qual "const") `(decl-spec-list ,@rest)
         `(decl-spec-list (type-qual ,qual) ,@(map ast-strip-const rest))))
    ((decl-spec-list (type-qual-list (type-qual ,qual)) . ,rest)
     (if (equal? qual "const") `(decl-spec-list ,@rest)
         `(decl-spec-list (type-qual-list (type-qual ,qual)) ,@(map ast-strip-const rest))))
    ((,h . ,t) (if (list? o) (filter-map ast-strip-const o)
                   (cons (ast-strip-const h) (ast-strip-const t))))
    (_  o)))

(define (clone o . rest)
  (cond ((info? o)
         (let ((types (.types o))
               (constants (.constants o))
               (functions (.functions o))
               (globals (.globals o))
               (locals (.locals o))
               (statics (.statics o))
               (function (.function o))
               (text (.text o))
               (break (.break o))
               (continue (.continue o)))
           (let-keywords rest
                         #f
                         ((types types)
                          (constants constants)
                          (functions functions)
                          (globals globals)
                          (locals locals)
                          (statics statics)
                          (function function)
                          (text text)
                          (break break)
                          (continue continue))
                         (make <info> #:types types #:constants constants #:functions functions #:globals globals  #:locals locals #:statics statics #:function function #:text text #:break break #:continue continue))))))

(define (ident->constant name value)
  (cons name value))

(define (enum->type-entry name fields)
  (cons `(tag ,name) (make-type 'enum 4 fields)))

(define (struct->type-entry name fields)
  (let ((size (apply + (map (compose ->size cdr) fields))))
    (cons `(tag ,name) (make-type 'struct size fields))))

(define (union->type-entry name fields)
  (let ((size (apply max (map (compose ->size cdr) fields))))
    (cons `(tag ,name) (make-type 'union size fields))))

(define i386:type-alist
  `(("char" . ,(make-type 'builtin 1 #f))
    ("short" . ,(make-type 'builtin 2 #f))
    ("int" . ,(make-type 'builtin 4 #f))
    ("long" . ,(make-type 'builtin 4 #f))
    ;;("long long" . ,(make-type 'builtin 8 #f))
    ;;("long long int" . ,(make-type 'builtin 8 #f))

    ("long long" . ,(make-type 'builtin 4 #f))  ;; FIXME
    ("long long int" . ,(make-type 'builtin 4 #f))

    ("void" . ,(make-type 'builtin 1 #f))
    ;; FIXME sign
    ("unsigned char" . ,(make-type 'builtin 1 #f))
    ("unsigned short" . ,(make-type 'builtin 2 #f))
    ("unsigned short int" . ,(make-type 'builtin 2 #f))
    ("unsigned" . ,(make-type 'builtin 4 #f))
    ("unsigned int" . ,(make-type 'builtin 4 #f))
    ("unsigned long" . ,(make-type 'builtin 4 #f))

    ;; ("unsigned long long" . ,(make-type 'builtin 8 #f))
    ;; ("unsigned long long int" . ,(make-type 'builtin 8 #f))
    ("unsigned long long" . ,(make-type 'builtin 4 #f)) ;; FIXME
    ("unsigned long long int" . ,(make-type 'builtin 4 #f))

    ("float" . ,(make-type 'builtin 4 #f))
    ("double" . ,(make-type 'builtin 8 #f))
    ("long double" . ,(make-type 'builtin 16 #f))))

(define (ast->type o info)
  (define (type-helper o info)
    (pmatch o
      (,t (guard (type? t)) t)
      (,p (guard (pointer? p)) p)
      (,a (guard (c-array? a)) a)

      ((char ,value) (get-type "char" info))
      ((enum-ref . _) (get-type "int" info))
      ((fixed ,value) (get-type "int" info))
      ((sizeof-expr . _) (get-type "int" info))
      ((sizeof-type . _) (get-type "int" info))
      ((string _) (make-c-array (get-type "char" info) #f))
      ((void) (get-type "void" info))

      ((type-name ,type) (ast->type type info))
      ((type-name ,type (abs-declr ,pointer))
       (let ((rank (pointer->rank pointer)))
         (rank+= (ast->type type info) rank)))

      ((ident ,name) (ident->type info name))
      ((tag ,name) (or (get-type o info)
                       o))

      (,name (guard (string? name))
             (let ((type (get-type name info)))
               (ast->type type info)))

      ((fctn-call (p-expr (ident ,name)) . _) (or (ident->type info name)
                                                  (get-type "int" info)))

      ((fixed-type ,type) (ast->type type info))
      ((float-type ,type) (ast->type type info))
      ((type-spec ,type) (ast->type type info))
      ((typename ,type) (ast->type type info))

      ((array-ref ,index ,array) (rank-- (ast->type array info)))

      ((de-ref ,expr) (rank-- (ast->type expr info)))
      ((ref-to ,expr) (rank++ (ast->type expr info)))

      ((p-expr ,expr) (ast->type expr info))
      ((pre-inc ,expr) (ast->type expr info))
      ((post-inc ,expr) (ast->type expr info))

      ((struct-ref (ident ,type))
       (or (get-type type info)
           (let ((struct (if (pair? type) type `(tag ,type))))
             (ast->type struct info))))
      ((union-ref (ident ,type))
       (or (get-type type info)
           (let ((struct (if (pair? type) type `(tag ,type))))
             (ast->type struct info))))

      ((struct-def (ident ,name) . _)
       (ast->type `(tag ,name) info))
      ((union-def (ident ,name) . _)
       (ast->type `(tag ,name) info))
      ((struct-def (field-list . ,fields))
       (let ((fields (append-map (struct-field info) fields)))
         (make-type 'struct (apply + (map field:size fields)) fields)))
      ((union-def (field-list . ,fields))
       (let ((fields (append-map (struct-field info) fields)))
         (make-type 'union (apply + (map field:size fields)) fields)))
      ((enum-def (enum-def-list . ,fields))
       (get-type "int" info))

      ((d-sel (ident ,field) ,struct)
       (let ((type0 (ast->type struct info)))
         (ast->type (field-type info type0 field) info)))

      ((i-sel (ident ,field) ,struct)
       (let ((type0 (ast->type (rank-- (ast->type struct info)) info)))
         (ast->type (field-type info type0 field) info)))

      ;; arithmetic
      ((pre-inc ,a) (ast->type a info))
      ((pre-dec ,a) (ast->type a info))
      ((post-inc ,a) (ast->type a info))
      ((post-dec ,a) (ast->type a info))
      ((add ,a ,b) (ast->type a info))
      ((sub ,a ,b) (ast->type a info))
      ((bitwise-and ,a ,b) (ast->type a info))
      ((bitwise-not ,a) (ast->type a info))
      ((bitwise-or ,a ,b) (ast->type a info))
      ((bitwise-xor ,a ,b) (ast->type a info))
      ((lshift ,a ,b) (ast->type a info))
      ((rshift ,a ,b) (ast->type a info))
      ((div ,a ,b) (ast->type a info))
      ((mod ,a ,b) (ast->type a info))
      ((mul ,a ,b) (ast->type a info))
      ((not ,a) (ast->type a info))
      ((neg ,a) (ast->type a info))
      ((eq ,a ,b) (ast->type a info))
      ((ge ,a ,b) (ast->type a info))
      ((gt ,a ,b) (ast->type a info))
      ((ne ,a ,b) (ast->type a info))
      ((le ,a ,b) (ast->type a info))
      ((lt ,a ,b) (ast->type a info))

      ;; logical
      ((or ,a ,b) (ast->type a info))
      ((and ,a ,b) (ast->type a info))

      ((cast (type-name ,type) ,expr) (ast->type type info))

      ((cast (type-name ,type (abs-declr ,pointer)) ,expr)
       (let ((rank (pointer->rank pointer)))
         (rank+= (ast->type type info) rank)))

      ((decl-spec-list (type-spec ,type)) (ast->type type info))

      ;;  ;; `typedef int size; void foo (unsigned size u)
      ((decl-spec-list (type-spec ,type) (type-spec ,type2))
       (ast->type type info))

      ((assn-expr ,a ,op ,b) (ast->type a info))

      ((cond-expr _ ,a ,b) (ast->type a info))

      (_ (get-type o info))))

  (let ((type (type-helper o info)))
    (cond ((or (type? type)
               (pointer? type) type
               (c-array? type)) type)
          ((and (equal? type o) (pair? type) (eq? (car type) 'tag)) o)
          ((equal? type o)
           (error "ast->type: not supported: " o))
          (else (ast->type type info)))))

(define (ast->basic-type o info)
  (let ((type (->type (ast->type o info))))
    (cond ((type? type) type)
          ((equal? type o) o)
          (else (ast->type type info)))))

(define (get-type o info)
  (let ((t (assoc-ref (.types info) o)))
    (pmatch t
      ((typedef ,next) (or (get-type next info) o))
      (_ t))))


(define (ast-type->size info o)
  (let ((type (->type (ast->type o info))))
    (cond ((type? type) (type:size type))
          (else (stderr "ast-type->size barf: ~s => ~s\n" o type)
                4))))

(define (field:name o)
  (pmatch o
    ((struct (,name ,type ,size ,pointer) . ,rest) name)
    ((union (,name ,type ,size ,pointer) . ,rest) name)
    ((,name . ,type) name)
    (_ (error "field:name not supported:" o))))

(define (field:pointer o)
  (pmatch o
    ((struct (,name ,type ,size ,pointer) . ,rest) pointer)
    ((union (,name ,type ,size ,pointer) . ,rest) pointer)
    ((,name . ,type) (->rank type))
    (_ (error "field:pointer not supported:" o))))

(define (field:size o)
  (pmatch o
    ((struct . ,type) (apply + (map field:size (struct->fields type))))
    ((union . ,type) (apply max (map field:size (struct->fields type))))
    ((,name . ,type) (->size type))
    (_ (error (format #f "field:size: ~s\n" o)))))

(define (field-field info struct field)
  (let ((fields (type:description struct)))
    (let loop ((fields fields))
      (if (null? fields) (error (format #f "no such field: ~a in ~s" field struct))
          (let ((f (car fields)))
            (cond ((equal? (car f) field) f)
                  ((and (memq (car f) '(struct union)) (type? (cdr f))
                        (find (lambda (x) (equal? (car x) field)) (struct->fields (cdr f)))))
                  (else (loop (cdr fields)))))))))

(define (field-offset info struct field)
  (if (eq? (type:type struct) 'union) 0
      (let ((fields (type:description struct)))
        (let loop ((fields fields) (offset 0))
          (if (null? fields) (error (format #f "no such field: ~a in ~s" field struct))
              (let ((f (car fields)))
                (cond ((equal? (car f) field) offset)
                      ((and (eq? (car f) 'struct) (type? (cdr f)))
                       (let ((fields (type:description (cdr f))))
                         (find (lambda (x) (equal? (car x) field)) fields)
                         (apply + (cons offset
                                        (map field:size
                                             (member field (reverse fields)
                                                     (lambda (a b)
                                                       (equal? a (car b) field))))))))
                      ((and (eq? (car f) 'union) (type? (cdr f))
                            (let ((fields (struct->fields (cdr f))))
                              (and (find (lambda (x) (equal? (car x) field)) fields)
                                   offset))))
                      (else (loop (cdr fields) (+ offset (field:size f)))))))))))

(define (field-pointer info struct field)
  (let ((field (field-field info struct field)))
    (field:pointer field)))

(define (field-size info struct field)
  (if (eq? (type:type struct) 'union) 0
      (let ((field (field-field info struct field)))
        (field:size field))))

(define (field-size info struct field)
  (let ((field (field-field info struct field)))
    (field:size field)))

(define (field-type info struct field)
  (let ((field (field-field info struct field)))
    (ast->type (cdr field) info)))

(define (struct->fields o)
  (pmatch o
    (_ (guard (and (type? o) (eq? (type:type o) 'struct)))
       (append-map struct->fields (type:description o)))
    (_ (guard (and (type? o) (eq? (type:type o) 'union)))
       (append-map struct->fields (type:description o)))
    ((struct . ,type) (list (car (type:description type))))
    ((struct . ,type) (list (car (type:description type))))
    (_ (list o))))

(define (struct->init-fields o)
  (pmatch o
    (_ (guard (and (type? o) (eq? (type:type o) 'struct)))
       (append-map struct->init-fields (type:description o)))
    (_ (guard (and (type? o) (eq? (type:type o) 'union)))
       (append-map struct->init-fields (type:description o)))
    ((struct . ,type) (struct->init-fields type))
    ((union . ,type) (list (car (type:description type))))
    (_ (list o))))

(define (byte->hex.m1 o)
  (string-drop o 2))

(define (asm->m1 o)
  (let ((prefix ".byte "))
    (if (not (string-prefix? prefix o)) (map (cut string-split <> #\space) (string-split o #\newline))
        (let ((s (string-drop o (string-length prefix))))
          (list (format #f "'~a'" (string-join (map byte->hex.m1 (cdr (string-split o #\space))) " ")))))))

(define (ident->variable info o)
  (or (assoc-ref (.locals info) o)
      (assoc-ref (.statics info) o)
      (assoc-ref (filter (negate static-global?) (.globals info)) o)
      (assoc-ref (.constants info) o)
      (assoc-ref (.functions info) o)
      (begin
        (error "ident->variable: undefined variable:" o))))

(define (static-global? o)
  ((compose global:function cdr) o))

(define (string-global? o)
  (and (pair? (car o))
       (eq? (caar o) #:string)))

(define (ident->type info o)
  (let ((var (ident->variable info o)))
    (cond ((global? var) (global:type var))
          ((local? var) (local:type var))
          ((function? var) (function:type var))
          ((assoc-ref (.constants info) o) (assoc-ref (.types info) "int"))
          ((pair? var) (car var))
          (else (stderr "ident->type ~s => ~s\n" o var)
                #f))))

(define (local:pointer o)
  (->rank o))

(define (ident->rank info o)
  (->rank (ident->variable info o)))

(define (ident->size info o)
  ((compose type:size (cut ident->type info <>)) o))

(define (pointer->rank o)
  (pmatch o
    ((pointer) 1)
    ((pointer ,pointer) (1+ (pointer->rank pointer)))))

(define (expr->rank info o)
  (->rank (ast->type o info)))

(define (ast->size o info)
  (->size (ast->type o info)))

(define (append-text info text)
  (clone info #:text (append (.text info) text)))

(define (push-global info)
  (lambda (o)
    (let ((rank (ident->rank info o)))
      (cond ((< rank 0) (list (i386:push-label `(#:address ,o)))) ;; FIXME
            (else (list (i386:push-label-mem `(#:address ,o))))))))

(define (push-local locals)
  (lambda (o)
    (wrap-as (i386:push-local (local:id o)))))

(define (push-global-address info)
  (lambda (o)
    (list (i386:push-label o))))

(define (push-local-address locals)
  (lambda (o)
    (wrap-as (i386:push-local-address (local:id o)))))

(define (push-local-de-ref info)
  (lambda (o)
    (let ((size (->size o)))
      (case size
        ((1) (wrap-as (i386:push-byte-local-de-ref (local:id o))))
        ((2) (wrap-as (i386:push-word-local-de-ref (local:id o))))
        ((4) (wrap-as (i386:push-local-de-ref (local:id o))))
        (else (error (format #f "TODO: push size >4: ~a\n" size)))))))

 ;; (if (= ptr 2) (ast-type->size info (local:type o)) ;; URG
 ;;                       4)
(define (push-local-de-de-ref info)
  (lambda (o)
    (let ((size (->size (rank-- (rank-- o)))))
      (if (= size 1)
          (wrap-as (i386:push-byte-local-de-de-ref (local:id o)))
          (error "TODO int-de-de-ref")))))

(define (make-global-entry name type value)
  (cons name (make-global name type value #f)))

(define (string->global-entry string)
  (let ((value (append (string->list string) (list #\nul))))
   (make-global-entry `(#:string ,string) "char" value))) ;; FIXME char-array

(define (make-local-entry name type id)
  (cons name (make-local name type id)))

(define* (mescc:trace name #:optional (type ""))
  (format (current-error-port) "    :~a~a\n" name type))

(define (push-ident info)
  (lambda (o)
    (cond ((assoc-ref (.locals info) o)
           =>
           (push-local (.locals info)))
          ((assoc-ref (.statics info) o)
           =>
           (push-global info))
          ((assoc-ref (filter (negate static-global?) (.globals info)) o)
           =>
           (push-global info))
          ((assoc-ref (.constants info) o)
           =>
           (lambda (constant)
             (wrap-as (append (i386:value->accu constant)
                              (i386:push-accu)))))
          (else
           ((push-global-address #f) `(#:address ,o))))))

(define (push-ident-address info)
  (lambda (o)
    (cond ((assoc-ref (.locals info) o)
           =>
           (push-local-address (.locals info)))
          ((assoc-ref (.statics info) o)
           =>
           (push-global-address info))
          ((assoc-ref (filter (negate static-global?) (.globals info)) o)
           =>
           (push-global-address info))
          (else
           ((push-global-address #f) `(#:address ,o))))))

(define (push-ident-de-ref info)
  (lambda (o)
    (cond ((assoc-ref (.locals info) o)
           =>
           (push-local-de-ref info))
          (else ((push-global info) o)))))

(define (push-ident-de-de-ref info)
  (lambda (o)
    (cond ((assoc-ref (.locals info) o)
           =>
           (push-local-de-de-ref info))
          (else
           (error "not supported: global push-ident-de-de-ref:" o)))))

(define (expr->arg info)
  (lambda (o)
    (pmatch o
      ((p-expr (string ,string))
       (let* ((globals ((globals:add-string (.globals info)) string))
              (info (clone info #:globals globals)))
         (append-text info ((push-global-address info) `(#:string ,string)))))
      (_ (let ((info (expr->accu o info)))
           (append-text info (wrap-as (i386:push-accu))))))))

(define (globals:add-string globals)
  (lambda (o)
    (let ((string `(#:string ,o)))
      (if (assoc-ref globals string) globals
          (append globals (list (string->global-entry o)))))))

(define (ident->accu info)
  (lambda (o)
    (cond ((assoc-ref (.locals info) o) => local->accu)
          ((assoc-ref (.statics info) o) => global->accu)
          ((assoc-ref (filter (negate static-global?) (.globals info)) o) => global->accu)
          ((assoc-ref (.constants info) o) => number->accu)
          (else (list (i386:label->accu `(#:address ,o)))))))

(define (local->accu o)
  (let* ((type (local:type o)))
    (cond ((or (c-array? type)
               (structured-type? type)) (wrap-as (i386:local-ptr->accu (local:id o))))
          (else (let ((size (->size o)))
                  (wrap-as (case size
                             ((1) (i386:byte-local->accu (local:id o)))
                             ((2) (i386:word-local->accu (local:id o)))
                             (else (i386:local->accu (local:id o))))))))))

(define (global->accu o)
  (let ((type (global:type o)))
    (cond ((or (c-array? type)
               (structured-type? type)) (wrap-as (i386:label->accu `(#:address ,o))))
          (else (wrap-as (i386:label-mem->accu `(#:address ,o)))))))

(define (number->accu o)
  (wrap-as (i386:value->accu o)))

(define (ident-address->accu info)
  (lambda (o)
    (cond ((assoc-ref (.locals info) o)
           =>
           (lambda (local) (wrap-as (i386:local-ptr->accu (local:id local)))))
          ((assoc-ref (.statics info) o)
           =>
           (lambda (global) (list (i386:label->accu `(#:address ,global)))))
          ((assoc-ref (filter (negate static-global?) (.globals info)) o)
           =>
           (lambda (global) (list (i386:label->accu `(#:address ,global)))))
          (else (list (i386:label->accu `(#:address ,o)))))))

(define (ident-address->base info)
  (lambda (o)
    (cond
     ((assoc-ref (.locals info) o)
      =>
      (lambda (local) (wrap-as (i386:local-ptr->base (local:id local)))))
     ((assoc-ref (.statics info) o)
      =>
      (lambda (global) (list (i386:label->base `(#:address ,global)))))
     ((assoc-ref (filter (negate static-global?) (.globals info)) o)
      =>
      (lambda (global) (list (i386:label->base `(#:address ,global)))))
     (else (list (i386:label->base `(#:address ,o)))))))

(define (value->accu v)
  (wrap-as (i386:value->accu v)))

(define (accu->local+n-text local n)
  (let* ((type (local:type local))
         (ptr (->rank local))
         (size (if (= ptr -1) ((compose type:size local:type) local)
                   4))
         (id (local:id local)))
    (wrap-as (case size
               ((1) (i386:byte-accu->local+n id n))
               ((2) (i386:word-accu->local+n id n))
               (else (i386:accu->local+n id n))))))

(define (accu->ident info)
  (lambda (o)
    (cond ((assoc-ref (.locals info) o)
           =>
           (lambda (local) (let ((size (->size local)))
                             (if (<= size 4) (wrap-as (i386:accu->local (local:id local)))
                                 (wrap-as (i386:accu*n->local (local:id local) size))))))
          ((assoc-ref (.statics info) o)
           =>
           (lambda (global) (let ((size (->size global)))
                              (if (<= size 4) (wrap-as (i386:accu->label global))
                                  (wrap-as (i386:accu*n->label global size))))))
          ((assoc-ref (filter (negate static-global?) (.globals info)) o)
           =>
           (lambda (global) (let ((size (->size global)))
                              (if (<= size 4) (wrap-as (i386:accu->label global))
                                  (wrap-as (i386:accu*n->label global size)))))))))

(define (value->ident info)
  (lambda (o value)
    (cond ((assoc-ref (.locals info) o)
           =>
           (lambda (local) (wrap-as (i386:value->local (local:id local) value))))
          ((assoc-ref (.statics info) o)
           =>
           (lambda (global) (list (i386:value->label `(#:address ,global) value))))
          ((assoc-ref (filter (negate static-global?) (.globals info)) o)
           =>
           (lambda (global) (list (i386:value->label `(#:address ,global) value)))))))

(define (ident-add info)
  (lambda (o n)
    (cond ((assoc-ref (.locals info) o)
           =>
           (lambda (local) (wrap-as (i386:local-add (local:id local) n))))
          ((assoc-ref (.statics info) o)
           =>
           (lambda (global) (list (i386:label-mem-add `(#:address ,o) n))))
          ((assoc-ref (filter (negate static-global?) (.globals info)) o)
           =>
           (lambda (global) (list (i386:label-mem-add `(#:address ,global) n)))))))

(define (ident-address-add info)
  (lambda (o n)
    (cond ((assoc-ref (.locals info) o)
           =>
           (lambda (local) (wrap-as (append (i386:push-accu)
                                            (i386:local->accu (local:id local))
                                            (i386:accu-mem-add n)
                                            (i386:pop-accu)))))
          ((assoc-ref (.statics info) o)
           =>
           (lambda (global) (list (wrap-as (append (i386:push-accu)
                                                   (i386:label->accu `(#:address ,global))
                                                   (i386:accu-mem-add n)
                                                   (i386:pop-accu))))))
          ((assoc-ref (filter (negate static-global?) (.globals info)) o)
           =>
           (lambda (global) (list (wrap-as (append (i386:push-accu)
                                                   (i386:label->accu `(#:address ,global))
                                                   (i386:accu-mem-add n)
                                                   (i386:pop-accu)))))))))

(define (make-comment o)
  (wrap-as `((#:comment ,o))))

(define (ast->comment o)
  (if mes? '()
      (let ((source (with-output-to-string (lambda () (pretty-print-c99 o)))))
        (make-comment (string-join (string-split source #\newline) " ")))))

(define (accu*n info n)
  (append-text info (wrap-as (case n
                               ((1) (i386:accu->base))
                               ((2) (i386:accu+accu))
                               ((3) (append (i386:accu->base)
                                            (i386:accu+accu)
                                            (i386:accu+base)))
                               ((4) (i386:accu-shl 2))
                               ((8) (append (i386:accu+accu)
                                            (i386:accu-shl 2)))
                               ((12) (append (i386:accu->base)
                                             (i386:accu+accu)
                                             (i386:accu+base)
                                             (i386:accu-shl 2)))
                               ((16) (i386:accu-shl 4))
                               (else (append (i386:value->base n)
                                             (i386:accu*base)))))))

(define (accu->base-mem*n- info n)
  (wrap-as
   (case n
     ((1) (i386:byte-accu->base-mem))
     ((2) (i386:word-accu->base-mem))
     ((4) (i386:accu->base-mem))
     (else (append (let loop ((i 0))
                     (if (>= i n) '()
                         (append (if (= i 0) '()
                                     (append (i386:accu+value 4)
                                             (i386:base+value 4)))
                                 (case (- n i)
                                   ((1) (append (i386:accu+value -3)
                                                (i386:base+value -3)
                                                (i386:accu-mem->base-mem)))
                                   ((2) (append (i386:accu+value -2)
                                                (i386:base+value -2)
                                                (i386:accu-mem->base-mem)))
                                   ((3) (append (i386:accu+value -1)
                                                (i386:base+value -1)
                                                (i386:accu-mem->base-mem)))
                                   (else (i386:accu-mem->base-mem)))
                                 (loop (+ i 4))))))))))

(define (accu->base-mem*n info n)
  (append-text info (accu->base-mem*n- info n)))

(define (expr->accu* o info)
  (pmatch o

    ((p-expr (ident ,name))
     (append-text info ((ident-address->accu info) name)))

    ((de-ref ,expr)
     (expr->accu expr info))

    ((d-sel (ident ,field) ,struct)
     (let* ((type (ast->basic-type struct info))
            (offset (field-offset info type field))
            (info (expr->accu* struct info)))
       (append-text info (wrap-as (i386:accu+value offset)))))

    ((i-sel (ident ,field) (fctn-call (p-expr (ident ,function)) . ,rest))
     (let* ((type (ast->basic-type `(fctn-call (p-expr (ident ,function)) ,@rest) info))
            (offset (field-offset info type field))
            (info (expr->accu `(fctn-call (p-expr (ident ,function)) ,@rest) info)))
       (append-text info (wrap-as (i386:accu+value offset)))))

    ((i-sel (ident ,field) ,struct)
     (let* ((type (ast->basic-type struct info))
            (offset (field-offset info type field))
            (info (expr->accu* struct info)))
       (append-text info (append (wrap-as (i386:mem->accu))
                                 (wrap-as (i386:accu+value offset))))))

    ((array-ref ,index ,array)
     (let* ((info (expr->accu index info))
            (size (ast->size o info))
            (info (accu*n info size))
            (info (expr->base array info)))
       (append-text info (wrap-as (i386:accu+base)))))

    (_ (error "expr->accu*: not supported: " o))))

(define (expr-add info)
  (lambda (o n)
    (let* ((info (expr->accu* o info))
           (info (append-text info (wrap-as (i386:accu-mem-add n)))))
      info)))

(define (expr->accu o info)
  (let ((locals (.locals info))
        (constants (.constants info))
        (text (.text info))
        (globals (.globals info)))
    (pmatch o
      ((expr) info)

      ((comma-expr) info)

      ((comma-expr ,a . ,rest)
       (let ((info (expr->accu a info)))
         (expr->accu `(comma-expr ,@rest) info)))

      ((p-expr (string ,string))
       (let* ((globals ((globals:add-string globals) string))
              (info (clone info #:globals globals)))
         (append-text info (list (i386:label->accu `(#:string ,string))))))

      ((p-expr (fixed ,value))
       (let ((value (cstring->number value)))
         (append-text info (wrap-as (i386:value->accu value)))))

      ((neg (p-expr (fixed ,value)))
       (let ((value (- (cstring->number value))))
         (append-text info (wrap-as (i386:value->accu value)))))

      ((p-expr (char ,char))
       (let ((char (char->integer (car (string->list char)))))
         (append-text info (wrap-as (i386:value->accu char)))))

      ((p-expr (string . ,strings))
       (append-text info (list (i386:label->accu `(#:string ,(apply string-append strings))))))

      ((p-expr (ident ,name))
       (append-text info ((ident->accu info) name)))

      ((initzer ,initzer)
       (expr->accu initzer info))

      ;; offsetoff
      ((ref-to (i-sel (ident ,field) (cast (type-name (decl-spec-list ,struct) (abs-declr (pointer))) (p-expr (fixed ,base)))))
       (let* ((type (ast->basic-type struct info))
              (offset (field-offset info type field))
              (base (cstring->number base)))
         (append-text info (wrap-as (i386:value->accu (+ base offset))))))

      ;; &foo
      ((ref-to (p-expr (ident ,name)))
       (append-text info ((ident-address->accu info) name)))

      ;; &*foo
      ((ref-to (de-ref ,expr))
       (expr->accu expr info))

      ((ref-to ,expr)
       (expr->accu* expr info))

      ((sizeof-expr ,expr)
       (append-text info (wrap-as (i386:value->accu (ast->size expr info)))))

      ((sizeof-type ,type)
       (append-text info (wrap-as (i386:value->accu (ast->size type info)))))

      ((array-ref ,index ,array)
       (let* ((info (expr->accu* o info))
              (size (ast->size o info)))
         (append-text info (wrap-as (case size
                                      ((1) (i386:byte-mem->accu))
                                      ((2) (i386:word-mem->accu))
                                      ((4) (i386:mem->accu))
                                      (else '()))))))

      ((d-sel ,field ,struct)
       (let* ((info (expr->accu* o info))
              (info (append-text info (ast->comment o)))
              (type (ast->type o info))
              (size (->size type))
              (array? (c-array? type)))
         (if array? info
             (append-text info (wrap-as (case size
                                          ((1) (i386:byte-mem->accu))
                                          ((2) (i386:word-mem->accu))
                                          ((4) (i386:mem->accu))
                                          (else '())))))))

      ((i-sel ,field ,struct)
       (let* ((info (expr->accu* o info))
              (info (append-text info (ast->comment o)))
              (type (ast->type o info))
              (size (->size type))
              (array? (c-array? type)))
         (if array? info
             (append-text info (wrap-as (case size
                                          ((1) (i386:byte-mem->accu))
                                          ((2) (i386:word-mem->accu))
                                          ((4) (i386:mem->accu))
                                          (else '())))))))

      ((de-ref ,expr)
       (let* ((info (expr->accu expr info))
              (size (ast->size o info)))
         (append-text info (wrap-as (case size
                                      ((1) (i386:byte-mem->accu))
                                      ((2) (i386:word-mem->accu))
                                      ((4) (i386:mem->accu))
                                      (else '()))))))

      ((fctn-call (p-expr (ident ,name)) (expr-list . ,expr-list))
       (if (equal? name "asm") (let ((arg0 (cadr (cadar expr-list)))) ;; FIXME
                                 (append-text info (wrap-as (asm->m1 arg0))))
           (let* ((text-length (length text))
                  (args-info (let loop ((expressions (reverse expr-list)) (info info))
                               (if (null? expressions) info
                                   (loop (cdr expressions) ((expr->arg info) (car expressions))))))
                  (n (length expr-list)))
             (if (not (assoc-ref locals name))
                 (begin
                   (if (and (not (assoc name (.functions info)))
                            (not (assoc name globals))
                            (not (equal? name (.function info))))
                       (stderr "warning: undeclared function: ~a\n" name))
                   (append-text args-info (list (i386:call-label name n))))
                 (let* ((empty (clone info #:text '()))
                        (accu (expr->accu `(p-expr (ident ,name)) empty)))
                   (append-text args-info (append (.text accu)
                                                  (list (i386:call-accu n)))))))))

      ((fctn-call ,function (expr-list . ,expr-list))
       (let* ((text-length (length text))
              (args-info (let loop ((expressions (reverse expr-list)) (info info))
                           (if (null? expressions) info
                               (loop (cdr expressions) ((expr->arg info) (car expressions))))))
              (n (length expr-list))
              (empty (clone info #:text '()))
              (accu (expr->accu function empty)))
         (append-text args-info (append (.text accu)
                                        (list (i386:call-accu n))))))

      ((cond-expr . ,cond-expr)
       (ast->info `(expr-stmt ,o) info))

      ((post-inc ,expr)
       (let* ((info (append (expr->accu expr info)))
              (info (append-text info (wrap-as (i386:push-accu))))
              (rank (expr->rank info expr))
              (size (cond ((= rank 1) (ast-type->size info expr))
                          ((> rank 1) 4)
                          (else 1)))
              (info ((expr-add info) expr size))
              (info (append-text info (wrap-as (i386:pop-accu)))))
         info))

      ((post-dec ,expr)
       (let* ((info (append (expr->accu expr info)))
              (info (append-text info (wrap-as (i386:push-accu))))
              (rank (expr->rank info expr))
              (size (cond ((= rank 1) (ast-type->size info expr))
                          ((> rank 1) 4)
                          (else 1)))
              (info ((expr-add info) expr (- size)))
              (info (append-text info (wrap-as (i386:pop-accu)))))
         info))

      ((pre-inc ,expr)
       (let* ((rank (expr->rank info expr))
              (size (cond ((= rank 1) (ast-type->size info expr))
                          ((> rank 1) 4)
                          (else 1)))
              (info ((expr-add info) expr size))
              (info (append (expr->accu expr info))))
         info))

      ((pre-dec ,expr)
       (let* ((rank (expr->rank info expr))
              (size (cond ((= rank 1) (ast-type->size info expr))
                          ((> rank 1) 4)
                          (else 1)))
              (info ((expr-add info) expr (- size)))
              (info (append (expr->accu expr info))))
         info))



      ((add ,a (p-expr (fixed ,value)))
       (let* ((rank (expr->rank info a))
              (type (ast->basic-type a info))
              (struct? (structured-type? type))
              (size (cond ((= rank 1) (ast-type->size info a))
                          ((> rank 1) 4)
                          ((and struct? (= rank 2)) 4)
                          (else 1)))
              (info (expr->accu a info))
              (value (cstring->number value))
              (value (* size value)))
         (append-text info (wrap-as (i386:accu+value value)))))

      ((add ,a ,b)
       (let* ((rank (expr->rank info a))
              (rank-b (expr->rank info b))
              (type (ast->basic-type a info))
              (struct? (structured-type? type))
              (size (cond ((= rank 1) (ast-type->size info a))
                          ((> rank 1) 4)
                          ((and struct? (= rank 2)) 4)
                          (else 1))))
         (if (or (= size 1)) ((binop->accu info) a b (i386:accu+base))
             (let* ((info (expr->accu b info))
                    (info (append-text info (wrap-as (append (i386:value->base size)
                                                             (i386:accu*base)
                                                             (i386:accu->base)))))
                    (info (expr->accu a info)))
               (append-text info (wrap-as (i386:accu+base)))))))

      ((sub ,a (p-expr (fixed ,value)))
       (let* ((rank (expr->rank info a))
              (type (ast->basic-type a info))
              (struct? (structured-type? type))
              (size (->size type))
              (size (cond ((= rank 1) size)
                          ((> rank 1) 4)
                          ((and struct? (= rank 2)) 4)
                          (else 1)))
              (info (expr->accu a info))
              (value (cstring->number value))
              (value (* size value)))
         (append-text info (wrap-as (i386:accu+value (- value))))))

      ((sub ,a ,b)
       (let* ((rank (expr->rank info a))
              (rank-b (expr->rank info b))
              (type (ast->basic-type a info))
              (struct? (structured-type? type))
              (size (->size type))
              (size  (cond ((= rank 1) size)
                           ((> rank 1) 4)
                           ((and struct? (= rank 2)) 4)
                           (else 1))))
         (if (or (= size 1) (or (= rank-b 2) (= rank-b 1)))
             (let ((info ((binop->accu info) a b (i386:accu-base))))
               (if (and (not (= rank-b 2)) (not (= rank-b 1))) info
                   (append-text info (wrap-as (append (i386:value->base size)
                                                      (i386:accu/base))))))
             (let* ((info (expr->accu b info))
                    (info (append-text info (wrap-as (append (i386:value->base size)
                                                             (i386:accu*base)
                                                             (i386:accu->base)))))
                    (info (expr->accu a info)))
               (append-text info (wrap-as (i386:accu-base)))))))

      ((bitwise-and ,a ,b) ((binop->accu info) a b (i386:accu-and-base)))
      ((bitwise-not ,expr)
       (let ((info (ast->info expr info)))
         (append-text info (wrap-as (i386:accu-not)))))
      ((bitwise-or ,a ,b) ((binop->accu info) a b (i386:accu-or-base)))
      ((bitwise-xor ,a ,b) ((binop->accu info) a b (i386:accu-xor-base)))
      ((lshift ,a ,b) ((binop->accu info) a b (i386:accu<<base)))
      ((rshift ,a ,b) ((binop->accu info) a b (i386:accu>>base)))
      ((div ,a ,b) ((binop->accu info) a b (i386:accu/base)))
      ((mod ,a ,b) ((binop->accu info) a b (i386:accu%base)))
      ((mul ,a ,b) ((binop->accu info) a b (i386:accu*base)))

      ((not ,expr)
       (let* ((test-info (ast->info expr info)))
         (clone info #:text
                (append (.text test-info)
                        (wrap-as (i386:accu-negate)))
                #:globals (.globals test-info))))

      ((neg ,expr)
       (let ((info (expr->base expr info)))
         (append-text info (append (wrap-as (i386:value->accu 0))
                                   (wrap-as (i386:sub-base))))))

      ((eq ,a ,b) ((binop->accu info) a b (append (i386:sub-base) (i386:z->accu))))
      ((ge ,a ,b) ((binop->accu info) a b (append (i386:sub-base) (i386:ge?->accu))))
      ((gt ,a ,b) ((binop->accu info) a b (append (i386:sub-base) (i386:g?->accu) (i386:accu-test))))

      ;; FIXME: set accu *and* flags
      ((ne ,a ,b) ((binop->accu info) a b (append (i386:push-accu)
                                                  (i386:sub-base)
                                                  (i386:nz->accu)
                                                  (i386:accu<->stack)
                                                  (i386:sub-base)
                                                  (i386:xor-zf)
                                                  (i386:pop-accu))))

      ((ne ,a ,b) ((binop->accu info) a b (append (i386:sub-base) (i386:xor-zf))))
      ((le ,a ,b) ((binop->accu info) a b (append (i386:sub-base) (i386:le?->accu))))
      ((lt ,a ,b) ((binop->accu info) a b (append (i386:sub-base) (i386:l?->accu))))

      ((or ,a ,b)
       (let* ((info (expr->accu a info))
              (here (number->string (length (.text info))))
              (skip-b-label (string-append "_" (.function info) "_" here "_or_skip_b"))
              (info (append-text info (wrap-as (i386:accu-test))))
              (info (append-text info (wrap-as (i386:jump-nz skip-b-label))))
              (info (append-text info (wrap-as (i386:accu-test))))
              (info (expr->accu b info))
              (info (append-text info (wrap-as (i386:accu-test))))
              (info (append-text info (wrap-as `((#:label ,skip-b-label))))))
         info))

      ((and ,a ,b)
       (let* ((info (expr->accu a info))
              (here (number->string (length (.text info))))
              (skip-b-label (string-append "_" (.function info) "_" here "_and_skip_b"))
              (info (append-text info (wrap-as (i386:accu-test))))
              (info (append-text info (wrap-as (i386:jump-z skip-b-label))))
              (info (append-text info (wrap-as (i386:accu-test))))
              (info (expr->accu b info))
              (info (append-text info (wrap-as (i386:accu-test))))
              (info (append-text info (wrap-as `((#:label ,skip-b-label))))))
         info))

      ((cast ,type ,expr)
       (expr->accu expr info))

      ((assn-expr (de-ref (post-inc (p-expr (ident ,name)))) (op ,op) ,b)
       (let* ((info (expr->accu `(assn-expr (de-ref (p-expr (ident ,name))) (op ,op) ,b) info))
              (type (ident->type info name))
              (rank (ident->rank info name))
              (size (if (> rank 1) 4 1)))
         (append-text info ((ident-add info) name size))))

      ((assn-expr (de-ref (post-dec (p-expr (ident ,name)))) (op ,op) ,b)
       (let* ((info (expr->accu `(assn-expr (de-ref (p-expr (ident ,name))) (op ,op) ,b) info))
              (type (ident->type info name))
              (rank (ident->rank info name))
              (size (if (> rank 1) 4 1)))
         (append-text info ((ident-add info) name (- size)))))

      ((assn-expr ,a (op ,op) ,b)
       (let* ((info (append-text info (ast->comment o)))
              (type (ast->type a info))
              (rank (->rank type))
              (type-b (ast->type b info))
              (rank-b (->rank type-b))
              (size (->size type))
              (size-b (->size type-b))
              (info (expr->accu b info))
              (info (if (equal? op "=") info
                        (let* ((struct? (structured-type? type))
                               (size (cond ((= rank 1) (ast-type->size info a))
                                           ((> rank 1) 4)
                                           ((and struct? (= rank 2)) 4)
                                           (else 1)))
                               (info (if (or (= size 1) (= rank-b 1)) info
                                         (let ((info (append-text info (wrap-as (i386:value->base size)))))
                                           (append-text info (wrap-as (i386:accu*base))))))
                               (info (append-text info (wrap-as (i386:push-accu))))
                               (info (expr->accu a info))
                               (info (append-text info (wrap-as (i386:pop-base))))
                               (info (append-text info (cond ((equal? op "+=") (wrap-as (i386:accu+base)))
                                                             ((equal? op "-=") (wrap-as (i386:accu-base)))
                                                             ((equal? op "*=") (wrap-as (i386:accu*base)))
                                                             ((equal? op "/=") (wrap-as (i386:accu/base)))
                                                             ((equal? op "%=") (wrap-as (i386:accu%base)))
                                                             ((equal? op "&=") (wrap-as (i386:accu-and-base)))
                                                             ((equal? op "|=") (wrap-as (i386:accu-or-base)))
                                                             ((equal? op "^=") (wrap-as (i386:accu-xor-base)))
                                                             ((equal? op ">>=") (wrap-as (i386:accu>>base)))
                                                             ((equal? op "<<=") (wrap-as (i386:accu<<base)))
                                                             (else (error (format #f "mescc: op ~a not supported: ~a\n" op o)))))))
                          (cond ((not (and (= rank 1) (= rank-b 1))) info)
                                ((equal? op "-=") (append-text info (wrap-as (append (i386:value->base size)
                                                                                     (i386:accu/base)))))
                                (else (error (format #f "invalid operands to binary ~s (have ~s* and ~s*)" op type (ast->basic-type b info)))))))))
         (when (and (equal? op "=")
                    (not (= size size-b))
                    (not (and (or (= size 1) (= size 2))
                              (= size-b 4)))
                    (not (and (= size 2)
                              (= size-b 4)))
                    (not (and (= size 4)
                              (or (= size-b 1) (= size-b 2)))))
           (stderr "ERROR assign: ~a" (with-output-to-string (lambda () (pretty-print-c99 o))))
           (stderr "   size[~a]:~a != size[~a]:~a\n"  rank size rank-b size-b))
         (pmatch a
           ((p-expr (ident ,name))
            (if (or (<= size 4) ;; FIXME: long long = int
                    (<= size-b 4)) (append-text info ((accu->ident info) name))
                    (let ((info (expr->base* a info)))
                      (accu->base-mem*n info size))))
           (_ (let ((info (expr->base* a info)))
                (accu->base-mem*n info (min size (max 4 size-b)))))))) ;; FIXME: long long = int

      (_ (error "expr->accu: not supported: " o)))))

(define (expr->base o info)
  (let* ((info (append-text info (wrap-as (i386:push-accu))))
         (info (expr->accu o info))
         (info (append-text info (wrap-as (append (i386:accu->base) (i386:pop-accu))))))
    info))

(define (binop->accu info)
  (lambda (a b c)
    (let* ((info (expr->accu a info))
           (info (expr->base b info)))
      (append-text info (wrap-as c)))))

(define (wrap-as o . annotation)
  `(,@annotation ,o))

(define (expr->base* o info)
  (let* ((info (append-text info (wrap-as (i386:push-accu))))
         (info (expr->accu* o info))
         (info (append-text info (wrap-as (i386:accu->base))))
         (info (append-text info (wrap-as (i386:pop-accu)))))
    info))

(define (comment? o)
  (and (pair? o) (pair? (car o)) (eq? (caar o) #:comment)))

(define (clause->info info i label last?)
  (define clause-label
    (string-append label "clause" (number->string i)))
  (define body-label
    (string-append label "body" (number->string i)))
  (define (jump label)
    (wrap-as (i386:jump label)))
  (define (jump-nz label)
    (wrap-as (i386:jump-nz label)))
  (define (jump-z label)
    (wrap-as (i386:jump-z label)))
  (define (test->text test)
    (let ((value (pmatch test
                   (0 0)
                   ((p-expr (char ,value)) (char->integer (car (string->list value))))
                   ((p-expr (ident ,constant)) (assoc-ref (.constants info) constant))
                   ((p-expr (fixed ,value)) (cstring->number value))
                   ((neg (p-expr (fixed ,value))) (- (cstring->number value)))
                   (_ (error "case test: not supported: " test)))))
      (append (wrap-as (i386:accu-cmp-value value))
              (jump-z body-label))))
  (define (cases+jump info cases)
    (let* ((info (append-text info (wrap-as `((#:label ,clause-label)))))
           (next-clause-label (if last? (string-append label "break")
                                  (string-append label "clause" (number->string (1+ i)))))
           (info (append-text info (apply append cases)))
           (info (if (null? cases) info
                     (append-text info (jump next-clause-label))))
           (info (append-text info (wrap-as `((#:label ,body-label))))))
      info))

  (lambda (o)
    (let loop ((o o) (cases '()) (clause #f))
      (pmatch o
        ((case ,test ,statement)
         (loop statement (append cases (list (test->text test))) clause))
        ((default ,statement)
         (loop statement cases clause))
        ((default . ,statements)
         (loop `(compd-stmt (block-item-list ,@statements)) cases clause))
        ((compd-stmt (block-item-list))
         (loop '() cases clause))
        ((compd-stmt (block-item-list . ,elements))
         (let ((clause (or clause (cases+jump info cases))))
           (loop `(compd-stmt (block-item-list ,@(cdr elements))) cases
                 (ast->info (car elements) clause))))
        (()
         (let ((clause (or clause (cases+jump info cases))))
           (if last? clause
               (let ((next-body-label (string-append label "body"
                                                     (number->string (1+ i)))))
                 (append-text clause (wrap-as (i386:jump next-body-label)))))))
        (_
         (let ((clause (or clause (cases+jump info cases))))
           (loop '() cases
                 (ast->info o clause))))))))

(define (test-jump-label->info info label)
  (define (jump type . test)
    (lambda (o)
      (let* ((info (ast->info o info))
             (info (append-text info (make-comment "jmp test LABEL")))
             (jump-text (wrap-as (type label))))
        (append-text info (append (if (null? test) '() (car test))
                                  jump-text)))))
  (lambda (o)
    (pmatch o
      ((expr) info)
      ;; unsigned
      ;; ((le ,a ,b) ((jump i386:jump-ncz) o)) ; ja
      ;; ((lt ,a ,b) ((jump i386:jump-nc) o))  ; jae
      ;; ((ge ,a ,b) ((jump i386:jump-ncz) o))
      ;; ((gt ,a ,b) ((jump i386:jump-nc) o))

      ((le ,a ,b) ((jump i386:jump-g) o))
      ((lt ,a ,b) ((jump i386:jump-ge) o))
      ((ge ,a ,b) ((jump i386:jump-l) o))
      ((gt ,a ,b) ((jump i386:jump-le) o))

      ((ne ,a ,b) ((jump i386:jump-nz) o))
      ((eq ,a ,b) ((jump i386:jump-nz) o))
      ((not _) ((jump i386:jump-z) o))

      ((and ,a ,b)
       (let* ((info ((test-jump-label->info info label) a))
              (info ((test-jump-label->info info label) b)))
         info))

      ((or ,a ,b)
       (let* ((here (number->string (length (if mes? (.text info)
                                                (filter (negate comment?) (.text info))))))
              (skip-b-label (string-append label "_skip_b_" here))
              (b-label (string-append label "_b_" here))
              (info ((test-jump-label->info info b-label) a))
              (info (append-text info (wrap-as (i386:jump skip-b-label))))
              (info (append-text info (wrap-as `((#:label ,b-label)))))
              (info ((test-jump-label->info info label) b))
              (info (append-text info (wrap-as `((#:label ,skip-b-label))))))
         info))

      ((array-ref ,index ,expr) (let* ((rank (expr->rank info expr))
                                       (size (if (= rank 1) (ast-type->size info expr)
                                                 4)))
                                  ((jump (if (= size 1) i386:jump-byte-z
                                             i386:jump-z)
                                         (wrap-as (i386:accu-zero?))) o)))

      ((de-ref ,expr) (let* ((rank (expr->rank info expr))
                             (size (if (= rank 1) (ast-type->size info expr)
                                       4)))
                        ((jump (if (= size 1) i386:jump-byte-z
                                   i386:jump-z)
                               (wrap-as (i386:accu-zero?))) o)))

      ((assn-expr (p-expr (ident ,name)) ,op ,expr)
       ((jump i386:jump-z
              (append ((ident->accu info) name)
                      (wrap-as (i386:accu-zero?)))) o))

      (_ ((jump i386:jump-z (wrap-as (i386:accu-zero?))) o)))))

(define (cstring->number s)
  (let ((s (cond ((string-suffix? "ULL" s) (string-drop-right s 3))
                 ((string-suffix? "UL" s) (string-drop-right s 2))
                 ((string-suffix? "LL" s) (string-drop-right s 2))
                 ((string-suffix? "L" s) (string-drop-right s 1))
                 (else s))))
    (cond ((string-prefix? "0x" s) (string->number (string-drop s 2) 16))
          ((string-prefix? "0b" s) (string->number (string-drop s 2) 2))
          ((string-prefix? "0" s) (string->number s 8))
          (else (string->number s)))))

(define (expr->number info o)
  (pmatch o
    ((fixed ,a) (cstring->number a))
    ((p-expr ,expr) (expr->number info expr))
    ((neg ,a)
     (- (expr->number info a)))
    ((add ,a ,b)
     (+ (expr->number info a) (expr->number info b)))
    ((bitwise-and ,a ,b)
     (logand (expr->number info a) (expr->number info b)))
    ((bitwise-not ,a)
     (lognot (expr->number info a)))
    ((bitwise-or ,a ,b)
     (logior (expr->number info a) (expr->number info b)))
    ((div ,a ,b)
     (quotient (expr->number info a) (expr->number info b)))
    ((mul ,a ,b)
     (* (expr->number info a) (expr->number info b)))
    ((sub ,a ,b)
     (- (expr->number info a) (expr->number info b)))
    ((sizeof-type ,type)
     (->size (ast->type type info)))
    ((sizeof-expr ,expr)
     (->size (ast->type expr info)))
    ((lshift ,x ,y)
     (ash (expr->number info x) (expr->number info y)))
    ((rshift ,x ,y)
     (ash (expr->number info x) (- (expr->number info y))))
    ((p-expr (ident ,name))
     (let ((value (assoc-ref (.constants info) name)))
       (or value
           (error (format #f "expr->number: undeclared identifier: ~s\n" o)))))
    ((cast ,type ,expr) (expr->number info expr))
    ((cond-expr ,test ,then ,else)
     (if (p-expr->bool info test) (expr->number info then) (expr->number info else)))
    (,string (guard (string? string)) (cstring->number string))
    (_  (error (format #f "expr->number: not supported: ~s\n" o)))))

(define (p-expr->bool info o)
  (pmatch o
    ((eq ,a ,b) (eq? (expr->number info a) (expr->number info b)))))

(define (struct-field info)
  (lambda (o)
    (pmatch o
      ((comp-decl (decl-spec-list (type-spec ,type)) (comp-declr-list (comp-declr (ident ,name))))
       (list (cons name (ast->type type info))))
      ((comp-decl (decl-spec-list (type-spec ,type)) (comp-declr-list (comp-declr (ptr-declr ,pointer (ident ,name)))))
       (let ((rank (pointer->rank pointer)))
         (list (cons name (rank+= (ast->type type info) rank)))))
      ((comp-decl (decl-spec-list (type-spec ,type)) (comp-declr-list (comp-declr (ftn-declr (scope (ptr-declr ,pointer (ident ,name))) _))))
       (let ((rank (pointer->rank pointer)))
         (list (cons name (rank+= (ast->type type info) rank)))))
      ((comp-decl (decl-spec-list (type-spec ,type)) (comp-declr-list (comp-declr (ptr-declr ,pointer (array-of (ident ,name) ,count)))))
       (let ((rank (pointer->rank pointer))
             (count (expr->number info count)))
         (list (cons name (make-c-array (rank+= type rank) count)))))
      ((comp-decl (decl-spec-list (type-spec ,type)) (comp-declr-list (comp-declr (array-of (ident ,name) ,count))))
       (let ((count (expr->number info count)))
         (list (cons name (make-c-array (ast->type type info) count)))))
      ((comp-decl (decl-spec-list (type-spec (struct-def (field-list . ,fields)))))
       (let ((fields (append-map (struct-field info) fields)))
         (list (cons 'struct (make-type 'struct (apply + (map field:size fields)) fields)))))
      ((comp-decl (decl-spec-list (type-spec (union-def (field-list . ,fields)))))
       (let ((fields (append-map (struct-field info) fields)))
         (list (cons 'union (make-type 'union (apply + (map field:size fields)) fields)))))
      ((comp-decl (decl-spec-list ,type) (comp-declr-list . ,decls))
       (append-map (lambda (o)
                     ((struct-field info) `(comp-decl (decl-spec-list ,type) (comp-declr-list ,o))))
                   decls))
      (_ (error "struct-field: not supported: " o)))))

(define (->size o)
  (cond ((and (type? o) (eq? (type:type o) 'struct))
         (apply + (map (compose ->size cdr) (struct->fields o))))
        ((and (type? o) (eq? (type:type o) 'union))
         (apply max (map (compose ->size cdr) (struct->fields o))))
        ((type? o) (type:size o))
        ((pointer? o) %pointer-size)
        ((c-array? o) %pointer-size)
        ((local? o) ((compose ->size local:type) o))
        ((global? o) ((compose ->size global:type) o))
        ;; FIXME
        ;; (#t
        ;;  (stderr "o=~s\n" o)
        ;;  (format (current-error-port) "->size: not a <type>: ~s\n" o)
        ;;  4)
        (else (error "->size>: not a <type>:" o))))

(define (local-var? o) ;; formals < 0, locals > 0
  (positive? (local:id o)))

(define (ptr-declr->rank o)
  (pmatch o
    ((pointer) 1)
    ((pointer (pointer)) 2)
    ((pointer (pointer (pointer))) 3)
    (_ (error "ptr-declr->rank not supported: " o))))

(define (statements->clauses statements)
  (let loop ((statements statements) (clauses '()))
    (if (null? statements) clauses
        (let ((s (car statements)))
          (pmatch s
            ((case ,test (compd-stmt (block-item-list . _)))
             (loop (cdr statements) (append clauses (list s))))
            ((case ,test (break))
             (loop (cdr statements) (append clauses (list s))))
            ((case ,test) (loop (cdr statements) (append clauses (list s))))

            ((case ,test ,statement)
             (let loop2 ((statement statement) (heads `((case ,test))))
               (define (heads->case heads statement)
                 (if (null? heads) statement
                     (append (car heads) (list (heads->case (cdr heads) statement)))))
               (pmatch statement
                 ((case ,t2 ,s2) (loop2 s2 (append heads `((case ,t2)))))
                 ((default ,s2) (loop2 s2 (append heads `((default)))))
                 ((compd-stmt (block-item-list . _)) (loop (cdr statements) (append clauses (list (heads->case heads statement)))))
                 (_ (let loop3 ((statements (cdr statements)) (c (list statement)))
                      (if (null? statements) (loop statements (append clauses (list (heads->case heads `(compd-stmt (block-item-list ,@c))))))
                          (let ((s (car statements)))
                            (pmatch s
                              ((case . _) (loop statements (append clauses (list (heads->case heads `(compd-stmt (block-item-list ,@c)))))))
                              ((default _) (loop statements (append clauses (list (heads->case heads `(compd-stmt (block-item-list ,@c)))))))
                              ((break) (loop (cdr statements) (append clauses (list (heads->case heads `(compd-stmt (block-item-list ,@(append c (list s)))))))))
                              (_ (loop3 (cdr statements) (append c (list s))))))))))))
            ((default (compd-stmt (block-item-list _)))
             (loop (cdr statements) (append clauses (list s))))
            ((default . ,statement)
             (let loop2 ((statements (cdr statements)) (c statement))
               (if (null? statements) (loop statements (append clauses (list `(default ,@c))))
                   (let ((s (car statements)))
                     (pmatch s
                       ((compd-stmt (block-item-list . _)) (loop (cdr statements) (append clauses (list `(default ,s)))))
                       ((case . _) (loop statements (append clauses (list `(default (compd-stmt (block-item-list ,@c)))))))
                       ((default _) (loop statements (append clauses (list `(default (compd-stmt (block-item-list ,@c)))))))
                       ((break) (loop (cdr statements) (append clauses (list `(default (compd-stmt (block-item-list ,@(append c (list s)))))))))

                       (_ (loop2 (cdr statements) (append c (list s)))))))))
            (_ (error "statements->clauses: not supported:" s)))))))

(define (ast->info o info)
  (let ((functions (.functions info))
        (globals (.globals info))
        (locals (.locals info))
        (constants (.constants info))
        (types (.types info))
        (text (.text info)))
    (pmatch o
      (((trans-unit . _) . _) (ast-list->info o info))
      ((trans-unit . ,_) (ast-list->info _ info))
      ((fctn-defn . ,_) (fctn-defn->info _ info))

      ((cpp-stmt (define (name ,name) (repl ,value)))
       info)

      ((cast (type-name (decl-spec-list (type-spec (void)))) _)
       info)

      ((break)
       (let ((label (car (.break info))))
         (append-text info (wrap-as (i386:jump label)))))

      ((continue)
       (let ((label (car (.continue info))))
         (append-text info (wrap-as (i386:jump label)))))

      ;; FIXME: expr-stmt wrapper?
      (trans-unit info)
      ((expr-stmt) info)

      ((compd-stmt (block-item-list . ,_)) (ast-list->info _ info))

      ((asm-expr ,gnuc (,null ,arg0 . string))
       (append-text info (wrap-as (asm->m1 arg0))))

      ((expr-stmt (fctn-call (p-expr (ident ,name)) (expr-list . ,expr-list)))
       (if (equal? name "asm") (let ((arg0 (cadr (cadar expr-list))))
                                 (append-text info (wrap-as (asm->m1 arg0))))
           (let* ((info (append-text info (ast->comment o)))
                  (info (expr->accu `(fctn-call (p-expr (ident ,name)) (expr-list . ,expr-list)) info)))
             (append-text info (wrap-as (i386:accu-zero?))))))

      ((if ,test ,then)
       (let* ((info (append-text info (ast->comment `(if ,test (ellipsis)))))
              (here (number->string (length text)))
              (label (string-append "_" (.function info) "_" here "_"))
              (break-label (string-append label "break"))
              (else-label (string-append label "else"))
              (info ((test-jump-label->info info break-label) test))
              (info (ast->info then info))
              (info (append-text info (wrap-as (i386:jump break-label))))
              (info (append-text info (wrap-as `((#:label ,break-label))))))
         (clone info
                #:locals locals)))

      ((if ,test ,then ,else)
       (let* ((info (append-text info (ast->comment `(if ,test (ellipsis) (ellipsis)))))
              (here (number->string (length text)))
              (label (string-append "_" (.function info) "_" here "_"))
              (break-label (string-append label "break"))
              (else-label (string-append label "else"))
              (info ((test-jump-label->info info else-label) test))
              (info (ast->info then info))
              (info (append-text info (wrap-as (i386:jump break-label))))
              (info (append-text info (wrap-as `((#:label ,else-label)))))
              (info (ast->info else info))
              (info (append-text info (wrap-as `((#:label ,break-label))))))
         (clone info
                #:locals locals)))

      ;; Hmm?
      ((expr-stmt (cond-expr ,test ,then ,else))
       (let* ((info (append-text info (ast->comment `(cond-expr ,test (ellipsis) (ellipsis)))))
              (here (number->string (length text)))
              (label (string-append "_" (.function info) "_" here "_"))
              (else-label (string-append label "else"))
              (break-label (string-append label "break"))
              (info ((test-jump-label->info info else-label) test))
              (info (ast->info then info))
              (info (append-text info (wrap-as (i386:jump break-label))))
              (info (append-text info (wrap-as `((#:label ,else-label)))))
              (info (ast->info else info))
              (info (append-text info (wrap-as `((#:label ,break-label))))))
         info))

      ((switch ,expr (compd-stmt (block-item-list . ,statements)))
       (let* ((info (append-text info (ast->comment `(switch ,expr (compd-stmt (block-item-list (ellipsis)))))))
              (here (number->string (length text)))
              (label (string-append "_" (.function info) "_" here "_"))
              (break-label (string-append label "break"))
              (clauses (statements->clauses statements))
              (info (expr->accu expr info))
              (info (clone info #:break (cons break-label (.break info))))
              (info (let loop ((clauses clauses) (i 0) (info info))
                      (if (null? clauses) info
                          (loop (cdr clauses) (1+ i) ((clause->info info i label (null? (cdr clauses))) (car clauses))))))
              (info (append-text info (wrap-as `((#:label ,break-label))))))
         (clone info
                #:locals locals
                #:break (cdr (.break info)))))

      ((for ,init ,test ,step ,body)
       (let* ((info (append-text info (ast->comment `(for ,init ,test ,step (ellipsis)))))
              (here (number->string (length text)))
              (label (string-append "_" (.function info) "_" here "_"))
              (break-label (string-append label "break"))
              (loop-label (string-append label "loop"))
              (continue-label (string-append label "continue"))
              (initial-skip-label (string-append label "initial_skip"))
              (info (ast->info init info))
              (info (clone info #:break (cons break-label (.break info))))
              (info (clone info #:continue (cons continue-label (.continue info))))
              (info (append-text info (wrap-as (i386:jump initial-skip-label))))
              (info (append-text info (wrap-as `((#:label ,loop-label)))))
              (info (ast->info body info))
              (info (append-text info (wrap-as `((#:label ,continue-label)))))
              (info (expr->accu step info))
              (info (append-text info (wrap-as `((#:label ,initial-skip-label)))))
              (info ((test-jump-label->info info break-label) test))
              (info (append-text info (wrap-as (i386:jump loop-label))))
              (info (append-text info (wrap-as `((#:label ,break-label))))))
         (clone info
                #:locals locals
                #:break (cdr (.break info))
                #:continue (cdr (.continue info)))))

      ((while ,test ,body)
       (let* ((info (append-text info (ast->comment `(while ,test (ellipsis)))))
              (here (number->string (length text)))
              (label (string-append "_" (.function info) "_" here "_"))
              (break-label (string-append label "break"))
              (loop-label (string-append label "loop"))
              (continue-label (string-append label "continue"))
              (info (append-text info (wrap-as (i386:jump continue-label))))
              (info (clone info #:break (cons break-label (.break info))))
              (info (clone info #:continue (cons continue-label (.continue info))))
              (info (append-text info (wrap-as `((#:label ,loop-label)))))
              (info (ast->info body info))
              (info (append-text info (wrap-as `((#:label ,continue-label)))))
              (info ((test-jump-label->info info break-label) test))
              (info (append-text info (wrap-as (i386:jump loop-label))))
              (info (append-text info (wrap-as `((#:label ,break-label))))))
         (clone info
                #:locals locals
                #:break (cdr (.break info))
                #:continue (cdr (.continue info)))))

      ((do-while ,body ,test)
       (let* ((info (append-text info (ast->comment `(do-while ,test (ellipsis)))))
              (here (number->string (length text)))
              (label (string-append "_" (.function info) "_" here "_"))
              (break-label (string-append label "break"))
              (loop-label (string-append label "loop"))
              (continue-label (string-append label "continue"))
              (info (clone info #:break (cons break-label (.break info))))
              (info (clone info #:continue (cons continue-label (.continue info))))
              (info (append-text info (wrap-as `((#:label ,loop-label)))))
              (info (ast->info body info))
              (info (append-text info (wrap-as `((#:label ,continue-label)))))
              (info ((test-jump-label->info info break-label) test))
              (info (append-text info (wrap-as (i386:jump loop-label))))
              (info (append-text info (wrap-as `((#:label ,break-label))))))
         (clone info
                #:locals locals
                #:break (cdr (.break info))
                #:continue (cdr (.continue info)))))

      ((labeled-stmt (ident ,label) ,statement)
       (let ((info (append-text info `(((#:label ,(string-append "_" (.function info) "_label_" label)))))))
         (ast->info statement info)))

      ((goto (ident ,label))
       (append-text info (wrap-as (i386:jump (string-append "_" (.function info) "_label_" label)))))

      ((return ,expr)
       (let ((info (expr->accu expr info)))
         (append-text info (append (wrap-as (i386:ret))))))

      ((decl . ,decl)
       ;;FIXME: ridiculous performance hit with mes
       ;; Nyacc 0.80.42: missing  (enum-ref (ident "fred"))
       (let (;;(info (append-text info (ast->comment o)))
             )
         (decl->info info decl)))
      ;; ...
      ((gt . _) (expr->accu o info))
      ((ge . _) (expr->accu o info))
      ((ne . _) (expr->accu o info))
      ((eq . _) (expr->accu o info))
      ((le . _) (expr->accu o info))
      ((lt . _) (expr->accu o info))
      ((lshift . _) (expr->accu o info))
      ((rshift . _) (expr->accu o info))

      ;; EXPR
      ((expr-stmt ,expression)
       (let ((info (expr->accu expression info)))
         (append-text info (wrap-as (i386:accu-zero?)))))

      ;; FIXME: why do we get (post-inc ...) here
      ;; (array-ref
      (_ (let ((info (expr->accu o info)))
           (append-text info (wrap-as (i386:accu-zero?))))))))

(define (ast-list->info o info)
  (fold ast->info info o))

(define (global->static function)
  (lambda (o)
    (cons (car o) (set-field (cdr o) (global:function) function))))

(define (decl->info info o)
  (pmatch o
    (((decl-spec-list (type-spec ,type)) (init-declr-list . ,inits))
     (let* ((info (type->info type #f info))
            (type (ast->type type info)))
       (fold (cut init-declr->info type <> <>) info (map cdr inits))))
    (((decl-spec-list (type-spec ,type)))
     (type->info type #f info))
    (((decl-spec-list (stor-spec (typedef)) (type-spec ,type)) (init-declr-list (init-declr (ident ,name))))
     (let* ((info (type->info type name info))
            (type (ast->type type info)))
       (clone info #:types (acons name type (.types info)))))
    (((decl-spec-list (stor-spec (,store)) (type-spec ,type)) (init-declr-list . ,inits))
     (let* ((type (ast->type type info))
            (function (.function info)))
       (if (not function) (fold (cut init-declr->info type <> <>) info (map cdr inits))
           (let* ((tmp (clone info #:function #f #:globals '()))
                  (tmp (fold (cut init-declr->info type <> <>) tmp (map cdr inits)))
                  (statics (map (global->static function) (.globals tmp)))
                  (strings (filter string-global? (.globals tmp))))
             (clone info #:globals (append (.globals info) strings)
                    #:statics (append statics (.statics info)))))))
    (((@ . _))
     (stderr "decl->info: skip: ~s\n" o)
     info)
    (_ (error "decl->info: not supported:" o))))

(define (ast->name o)
  (pmatch o
    ((ident ,name) name)
    ((ptr-declr ,pointer (ident ,name)) name)
    ((array-of ,array . ,_) (ast->name array))
    ((ftn-declr (scope (ptr-declr ,pointer (ident ,name)))) name)
    ((ptr-declr ,pointer ,decl . ,_) (ast->name decl))
    (_ (error "ast->name not supported: " o))))

(define (init-declr->count info o)
  (pmatch o
    ((array-of (ident ,name) ,count) (expr->number info count))
    (_ #f)))

(define (init->accu o info)
  (pmatch o
    ((initzer-list (initzer ,expr)) (expr->accu expr info))
    (((#:string ,string))
     (append-text info (list (i386:label->accu `(#:string ,string)))))
    ((,number . _) (guard (number? number))
     (append-text info (wrap-as (i386:value->accu 0))))
    ((,c . ,_) (guard (char? c)) info)
    (_ (expr->accu o info))))

(define (init-struct-field local field init info)
  (let* ((offset (field-offset info (local:type local) (car field)))
         (size (field:size field))
         (empty (clone info #:text '())))
    (clone info #:text
           (append
            (.text info)
            (local->accu local)
            (wrap-as (append (i386:accu->base)))
            (wrap-as (append (i386:push-base)))
            (.text (expr->accu init empty))
            (wrap-as (append (i386:pop-base)))
            (wrap-as (case size
                       ((1) (i386:byte-accu->base-mem+n offset))
                       ((2) (i386:word-accu->base-mem+n offset))
                       (else (i386:accu->base-mem+n offset))))))))

(define (init-array-entry local index init info)
  (let* ((size (or (and (zero? (local:pointer local)) ((compose type:size local:type) local))
                   4))
         (offset (* index size))
         (empty (clone info #:text '())))
    (clone info #:text
           (append
            (.text info)
            (local->accu local)
            (wrap-as (append (i386:accu->base)))
            (wrap-as (append (i386:push-base)))
            (.text (expr->accu init empty))
            (wrap-as (append (i386:pop-base)))
            (wrap-as (case size
                       ((1) (i386:byte-accu->base-mem+n offset))
                       ((2) (i386:word-accu->base-mem+n offset))
                       (else (i386:accu->base-mem+n offset))))))))


(define (init-local local o n info)
  (pmatch o
    (#f info)
    ((initzer ,init)
     (init-local local init n info))
    ((initzer-list ,init)
     (init-local local init n info))
    ((initzer-list . ,inits)
     (let ((struct? (structured-type? local)))
       (cond (struct?
              (let ((fields ((compose struct->init-fields local:type) local)))
                (fold (cut init-struct-field local <> <> <>) info fields (append inits (map (const '(p-expr (fixed "22"))) (iota (max 0 (- (length fields) (length inits)))))))))
             (else (fold (cut init-local local <> <> <>) info inits (iota (length inits)))))))
    (((initzer (initzer-list . ,inits)))
     (fold (cut init-array-entry local <> <> <>) info (iota (length inits)) inits))
    (() info)
    (_ (let ((info (init->accu o info)))
         (append-text info (accu->local+n-text local n))))))

(define (local->info type name o init info)
  (let* ((locals (.locals info))
         (id (if (or (null? locals) (not (local-var? (cdar locals)))) 1
                 (1+ (local:id (cdar locals)))))
         (local (make-local-entry name type id))
         (pointer (->rank (cdr local)))
         (array (or (and (c-array? type) type)
                    (and (pointer? type) (c-array? (pointer:type type))
                         (pointer:type type))
                    (and (pointer? type)
                         (pointer? (pointer:type type))
                         (c-array? (pointer:type (pointer:type type)))
                         (pointer:type (pointer:type type)))))
         (struct? (structured-type? type))
         (size (->size type))
         (count (and (c-array? array) (c-array:count array)))
         (local (if (not array) local
                    (make-local-entry name type (+ (local:id (cdr local)) -1 (quotient (+ (* count size) 3) 4)))))
         (local (if struct? (make-local-entry name type (+ (local:id (cdr local)) (quotient (+ size 3) 4)))
                    local))
         (locals (cons local locals))
         (info (clone info #:locals locals))
         (local (cdr local)))
    (init-local local init 0 info)))

(define (global->info type name o init info)
  (let* ((rank (->rank type))
         (size (cond ;;((not (zero? rank)) 4)
                ((pointer? type) 4)
                ((c-array? type) (cond ((pointer? (c-array:type type)) 4)
                                       ((type? (c-array:type type)) ((compose type:size c-array:type) type))
                                       (else (error "urg:" type))))
                ((type? type) (type:size type))
                (else (error "global->info: no such type:" type))))
         (data (cond ((not init) (string->list (make-string size #\nul)))
                     ((let ((array (or (and (c-array? type) type)
                                       (and (pointer? type)
                                            (c-array? (pointer:type type))
                                            (pointer:type type))
                                       (and (pointer? type)
                                            (pointer? (pointer:type type))
                                            (c-array? (pointer:type (pointer:type type)))
                                            (pointer:type (pointer:type type))))))
                        array)
                      =>
                      (lambda (array) (array-init->data (* (c-array:count array) size) init info)))
                     (else (let ((data (init->data init info)))
                             (append data (string->list (make-string (max 0 (- size (length data))) #\nul)))))))
         (global (make-global-entry name type data)))
    (clone info #:globals (append (.globals info) (list global)))))

(define (array-init-element->data size o info)
  (pmatch o
    ((initzer (p-expr (string ,string)))
     `((#:string ,string)))
    ((initzer (p-expr (fixed ,fixed)))
     (int->bv32 (expr->number info fixed)))
    (_ (init->data o info))
    ;;(_ (error "array-init-element->data: not supported: " o))
    ))

(define (array-init->data size o info)
  (pmatch o
    (((initzer (initzer-list . ,inits)))
     (map (cut array-init-element->data size <> info) inits))

    ((initzer (p-expr (string ,string)))
     (let ((data (string->list string)))
       (if (not size) data
           (append data (string->list (make-string (max 0 (- size (length data))) #\nul))))))

    (((initzer (p-expr (string ,string))))
     (let ((data (string->list string)))
       (if (not size) data
           (append data (string->list (make-string (max 0 (- size (length data))) #\nul))))))

    (((initzer (p-expr (string . ,strings))))
     (let ((data (string->list (apply string-append strings))))
       (if (not size) data
           (append data (string->list (make-string (max 0 (- size (length data))) #\nul))))))

    ((initzer (p-expr (fixed ,fixed)))
     (int->bv32 (expr->number info fixed)))

    (() (string->list (make-string size #\nul)))
    (_ (error "array-init->data: not supported: " o))))

(define (init-declr->info type o info)
  (pmatch o
    (((ident ,name))
     (if (.function info) (local->info type name o #f info)
         (global->info type name o #f info)))
    (((ident ,name) (initzer ,init))
     (let* ((strings (init->strings init info))
            (info (if (null? strings) info
                      (clone info #:globals (append (.globals info) strings)))))
       (if (.function info) (local->info type name o init info)
           (global->info type name o init info))))
    (((ftn-declr (ident ,name) . ,_))
     (let ((functions (.functions info)))
       (if (member name functions) info
           (let* ((type (ftn-declr:get-type info `(ftn-declr (ident ,name) ,@_)))
                  (function (make-function name type  #f)))
             (clone info #:functions (cons (cons name function) functions))))))
    (((ftn-declr (scope (ptr-declr ,pointer (ident ,name))) ,param-list) ,init)
     (let* ((rank (pointer->rank pointer))
            (type (rank+= type rank)))
       (if (.function info) (local->info type name o init info)
           (global->info type name o init info))))
    (((ptr-declr ,pointer . ,_) . ,init)
     (let* ((rank (pointer->rank pointer))
            (type (rank+= type rank)))
       (init-declr->info type (append _ init) info)))
    (((array-of (ident ,name) ,count) . ,init)
     (let* ((strings (init->strings init info))
            (info (if (null? strings) info
                      (clone info #:globals (append (.globals info) strings))))
            (count (expr->number info count))
            (type (make-c-array type count)))
       (if (.function info) (local->info type name o init info)
           (global->info type name o init info))))
    (((array-of (ident ,name)) . ,init)
     (let* ((strings (init->strings init info))
            (info (if (null? strings) info
                      (clone info #:globals (append (.globals info) strings))))
            (count (length (cadar init)))
            (type (make-c-array type count)))
       (if (.function info) (local->info type name o init info)
           (global->info type name o init info))))
    ;; FIXME: recursion
    (((array-of (array-of (ident ,name) ,count) ,count1) . ,init)
     (let* ((strings (init->strings init info))
            (info (if (null? strings) info
                      (clone info #:globals (append (.globals info) strings))))
            (count (expr->number info count))
            (type (make-c-array (rank++ type) count)))
       (if (.function info) (local->info type name o init info)
           (global->info type name o init info))))
    (_ (error "init-declr->info: not supported: " o))))

(define (enum-def-list->constants constants fields)
  (let loop ((fields fields) (i 0) (constants constants))
    (if (pair? fields)
        (let ((field (car fields)))
          (mescc:trace (cadr (cadr field)) " <e>")))
    (if (null? fields) constants
        (let* ((field (car fields))
               (name (pmatch field
                       ((enum-defn (ident ,name) . _) name)))
               (i (pmatch field
                    ((enum-defn ,name) i)
                    ((enum-defn ,name ,exp) (expr->number #f exp))
                    (_ (error "not supported enum field=~s\n" field)))))
          (loop (cdr fields)
                (1+ i)
                (append constants (list (ident->constant name i))))))))

(define (init->data o info)
  (pmatch o
    ((p-expr ,expr) (init->data expr info))
    ((fixed ,fixed) (int->bv32 (expr->number info o)))
    ((char ,char) (int->bv32 (char->integer (string-ref char 0))))
    ((string ,string) `((#:string ,string)))
    ((string . ,strings) `((#:string ,(string-join strings ""))))
    ((ident ,name) (let ((var (ident->variable info name)))
                     `((#:address ,var))))
    ((initzer-list . ,initzers) (append-map (cut init->data <> info) initzers))
    (((initzer (initzer-list . ,inits)))
     (init->data `(initzer-list . ,inits) info))
    ((ref-to (p-expr (ident ,name)))
     (let ((var (ident->variable info name)))
       `((#:address ,var))))
    ((ref-to (i-sel (ident ,field) (cast (type-name (decl-spec-list ,struct) (abs-declr (pointer))) (p-expr (fixed ,base)))))
     (let* ((type (ast->type struct info))
            (offset (field-offset info type field))
            (base (cstring->number base)))
       (int->bv32 (+ base offset))))
    ((,char . _) (guard (char? char)) o)
    ((,number . _) (guard (number? number))
     (append (map int->bv32 o)))
    ((initzer ,init) (init->data init info))
    ((cast _ ,expr) (init->data expr info))
    (_ (error "init->data: not supported: " o))))

(define (init->strings o info)
  (let ((globals (.globals info)))
    (pmatch o
      ((p-expr (string ,string))
       (let ((g `(#:string ,string)))
         (if (assoc g globals) '()
             (list (string->global-entry string)))))
      ((p-expr (string . ,strings))
       (let* ((string (string-join strings ""))
              (g `(#:string ,string)))
         (if (assoc g globals) '()
             (list (string->global-entry string)))))
      (((initzer (initzer-list . ,init)))
       (append-map (cut init->strings <> info) init))
      ((initzer ,init)
       (init->strings init info))
      ((initzer-list . ,init)
       (append-map (cut init->strings <> info) init))
      (_ '()))))

(define (type->info o name info)
  (pmatch o

    ((enum-def (ident ,name) (enum-def-list . ,fields))
     (mescc:trace name " <t>")
     (let* ((type-entry (enum->type-entry name fields))
            (constants (enum-def-list->constants (.constants info) fields)))
       (clone info
              #:types (cons type-entry (.types info))
              #:constants (append constants (.constants info)))))

    ((enum-def (enum-def-list . ,fields))
     (mescc:trace name " <t>")
     (let* ((type-entry (enum->type-entry name fields))
            (constants (enum-def-list->constants (.constants info) fields)))
       (clone info
              #:types (cons type-entry (.types info))
              #:constants (append constants (.constants info)))))

    ((struct-def (field-list . ,fields))
     (mescc:trace name " <t>")
     (let ((type-entry (struct->type-entry name (append-map (struct-field info) fields))))
       (clone info #:types (cons type-entry (.types info)))))

    ((struct-def (ident ,name) (field-list . ,fields))
     (mescc:trace name " <t>")
     (let ((type-entry (struct->type-entry name (append-map (struct-field info) fields))))
       (clone info #:types (cons type-entry (.types info)))))

    ((union-def (ident ,name) (field-list . ,fields))
     (mescc:trace name " <t>")
     (let ((type-entry (union->type-entry name (append-map (struct-field info) fields))))
       (clone info #:types (cons type-entry (.types info)))))

    ((union-def (field-list . ,fields))
     (mescc:trace name " <t>")
     (let ((type-entry (union->type-entry name (append-map (struct-field info) fields))))
       (clone info #:types (cons type-entry (.types info)))))

    ((enum-ref . _) info)
    ((struct-ref . _) info)
    ((typename ,name) info)
    ((union-ref . _) info)
    ((fixed-type . _) info)
    ((void) info)

    (_ ;;(error "type->info: not supported:" o)
     (stderr "type->info: not supported: ~s\n" o)
     info
     )))

;;; fctn-defn
(define (param-decl:get-name o)
  (pmatch o
    ((ellipsis) #f)
    ((param-decl (decl-spec-list (type-spec (void)))) #f)
    ((param-decl _ (param-declr ,ast)) (ast->name ast))
    (_ (error "param-decl:get-name not supported:" o))))

(define (fctn-defn:get-name o)
  (pmatch o
    ((_ (ftn-declr (ident ,name) _) _) name)
    ((_ (ptr-declr (pointer . _) (ftn-declr (ident ,name) _)) _) name)
    (_ (error "fctn-defn:get-name not supported:" o))))

(define (param-decl:get-type o info)
  (pmatch o
    ((ellipsis) #f)
    ((param-decl (decl-spec-list ,type)) (ast->type type info))
    ((param-decl (decl-spec-list (type-spec ,type)) (param-declr (ptr-declr ,pointer (ident ,name))))
     (let ((rank (pointer->rank pointer)))
       (rank+= (ast->type type info) rank)))
    ((param-decl (decl-spec-list ,type) (param-declr (ptr-declr ,pointer (array-of _))))
     (let ((rank (pointer->rank pointer)))
       (rank+= (ast->type type info) (1+ rank))))
    ((param-decl ,type _) (ast->type type info))
    (_ (error "param-decl:get-type not supported:" o))))

(define (fctn-defn:get-formals o)
  (pmatch o
    ((_ (ftn-declr _ ,formals) _) formals)
    ((_ (ptr-declr (pointer . _) (ftn-declr _ ,formals)) _) formals)
    (_ (error "fctn-defn->formals: not supported:" o))))

(define (formal->text n)
  (lambda (o i)
    ;;(i386:formal i n)
    '()
    ))

(define (param-list->text o)
  (pmatch o
    ((param-list . ,formals)
     (let ((n (length formals)))
       (wrap-as (append (i386:function-preamble)
                        (append-map (formal->text n) formals (iota n))
                        (i386:function-locals)))))
    (_ (error "param-list->text: not supported: " o))))

(define (param-list->locals o info)
  (pmatch o
    ((param-list . ,formals)
     (let ((n (length formals)))
       (map make-local-entry
            (map param-decl:get-name formals)
            (map (cut param-decl:get-type <> info) formals)
            (iota n -2 -1))))
    (_ (error "param-list->locals: not supported:" o))))

(define (fctn-defn:get-type info o)
  (pmatch o
    (((decl-spec-list (type-spec ,type)) (ptr-declr ,pointer . _) ,statement)
     (let* ((type (ast->type type info))
            (rank (ptr-declr->rank pointer)))
       (if (zero? rank) type
           (make-pointer type rank))))
    (((decl-spec-list (type-spec ,type)) . _)
     (ast->type type info))
    (((decl-spec-list (stor-spec ,store) (type-spec ,type)) . _)
     (ast->type type info))

    ;; (((decl-spec-list (stor-spec ,store) (type-spec ,type)) (ftn-declr (ident _) _) _)
    ;;  (ast->type type info))
    ;; (((decl-spec-list (stor-spec ,store) (type-spec ,type)) (ptr-declr ,pointer (ftn-declr (ident _) _)) _)
    ;;  (ast->type type info))

    (_ (error "fctn-defn:get-type: not supported:" o))))

(define (ftn-declr:get-type info o)
  (pmatch o
    ((ftn-declr (ident _) . _) #f)
    (_ (error "fctn-decrl:get-type: not supported:" o))))

(define (fctn-defn:get-statement o)
  (pmatch o
    ((_ (ftn-declr (ident _) _) ,statement) statement)
    ((_ (ptr-declr (pointer . _) (ftn-declr (ident _) . _)) ,statement) statement)
    (_ (error "fctn-defn:get-statement: not supported: " o))))

(define (fctn-defn->info o info)
  (define (assert-return text)
    (let ((return (wrap-as (i386:ret))))
      (if (equal? (list-tail text (- (length text) (length return))) return) text
          (append text return))))
  (let ((name (fctn-defn:get-name o)))
    (mescc:trace name)
    (let* ((type (fctn-defn:get-type info o))
           (formals (fctn-defn:get-formals o))
           (text (param-list->text formals))
           (locals (param-list->locals formals info))
           (statement (fctn-defn:get-statement o))
           (function (cons name (make-function name type '())))
           (functions (cons function (.functions info)))
           (info (clone info #:locals locals #:function name #:text text #:functions functions #:statics '()))
           (info (ast->info statement info))
           (locals (.locals info))
           (local (and (pair? locals) (car locals)))
           (count (and=> local (compose local:id cdr)))
           (stack (and count (* count 4))))
      (if (and stack (getenv "MESC_DEBUG")) (stderr "        stack: ~a\n" stack))
      (clone info
             #:function #f
             #:globals (append (.statics info) (.globals info))
             #:statics '()
             #:functions (append (.functions info) (list (cons name (make-function name type (assert-return (.text info))))))))))

;; exports

(define* (c99-ast->info o)
  (ast->info o (make <info> #:types i386:type-alist)))

(define* (c99-input->ast #:key (defines '()) (includes '()))
  (stderr "parsing: input\n")
  ((compose ast-strip-const ast-strip-comment) (c99-input->full-ast #:defines defines #:includes includes)))

(define* (c99-input->info #:key (defines '()) (includes '()))
  (lambda ()
    (let* ((info (make <info> #:types i386:type-alist))
           (ast (c99-input->ast #:defines defines #:includes includes))
           (foo (stderr "compiling: input\n"))
           (info (ast->info ast info))
           (info (clone info #:text '() #:locals '())))
      info)))

(define* (info->object o)
  (stderr "compiling: object\n")
  `((functions . ,(filter (compose function:text cdr) (.functions o)))
    (globals . ,(.globals o))))

(define* (c99-input->elf #:key (defines '()) (includes '()))
  ((compose object->elf info->object (c99-input->info #:defines defines #:includes includes))))

(define* (c99-input->object #:key (defines '()) (includes '()))
  ((compose object->M1 info->object (c99-input->info #:defines defines #:includes includes))))