/* hello.sf */
/* Generated by #F $Id$ */
#ifdef PROFILE
#define host host_module_hello
#endif
#define MODULE module_hello
#define LOAD() 

/* standard includes */
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <assert.h>

/* standard definitions */

typedef ptrdiff_t obj;        /* pointers are this size, lower bit zero */
typedef ptrdiff_t cxoint_t;   /* same thing, used as integer */
typedef struct {              /* type descriptor */
  const char *tname;          /* name (debug) */
  void (*free)(void*);        /* deallocator */
} cxtype_t;

#define notobjptr(o)          (((char*)(o) - (char*)cxg_heap) & cxg_hmask)
#define isobjptr(o)           (!notobjptr(o))
#define notaptr(o)            ((o) & 1)
#define isaptr(o)             (!notaptr(o))

#define obj_from_obj(o)       (o)
#define obj_from_objptr(p)    ((obj)(p))
#define obj_from_size(n)      (((cxoint_t)(n) << 1) | 1)

#define objptr_from_objptr(p) (p)
#define objptr_from_obj(o)    ((obj*)(o))

#define size_from_obj(o)      ((int)((o) >> 1))

#define obj_from_case(n)      obj_from_objptr(cases+(n))
#define case_from_obj(o)      (objptr_from_obj(o)-cases)
#define obj_from_ktrap()      obj_from_size(0x5D56F806)
#define obj_from_void(v)      ((void)(v), obj_from_size(0x6F56DF77))

#define bool_from_obj(o)      (o)
#define bool_from_bool(b)     (b)
#define bool_from_size(s)     (s)

#define void_from_void(v)     (void)(v)
#define void_from_obj(o)      (void)(o)

#define rreserve(m)           if (r + (m) >= cxg_rend) r = cxm_rgc(r, m)
#define hpushptr(p, pt, l)    (hreserve(2, l), *--hp = (obj)(p), *--hp = (obj)(pt), (obj)(hp+1))   
#define hbsz(s)               ((s) + 1) /* 1 extra word to store block size */
#define hreserve(n, l)        ((hp < cxg_heap + (n)) ? hp = cxm_hgc(r, r+(l), hp, n) : hp)
#define hendblk(n)            (*--hp = obj_from_size(n), (obj)(hp+1))
#define hblklen(p)            size_from_obj(((obj*)(p))[-1])
#define hblkref(p, i)         (((obj*)(p))[i])

typedef obj (*cxhost_t)(obj);
typedef struct cxroot_tag {
  int globc; obj **globv;
  struct cxroot_tag *next;
} cxroot_t;

extern obj *cxg_heap;
extern obj *cxg_hp;
extern cxoint_t cxg_hmask;
extern cxroot_t *cxg_rootp;
extern obj *cxm_rgc(obj *regs, size_t needs);
extern obj *cxm_hgc(obj *regs, obj *regp, obj *hp, size_t needs);
extern obj *cxg_regs, *cxg_rend;
extern void cxm_check(int x, char *msg);
extern void *cxm_cknull(void *p, char *msg);
extern int cxg_rc;
extern char **cxg_argv;

/* cx globals */
obj cx_main; /* main */

/* gc roots */
static cxroot_t root = { 0, NULL, NULL };

/* entry points */
static obj host(obj);
static obj cases[2] = {
  (obj)host,  (obj)host,
};

/* host procedure */
#define MAX_HOSTREGS 14
static obj host(obj pc)
{
  register obj *r = cxg_regs;
  register obj *hp = cxg_hp;
  register int rc = cxg_rc;
  rreserve(MAX_HOSTREGS); 
jump: 
  switch (case_from_obj(pc)) {

case 0: /* load module */
    { static obj c[] = { obj_from_case(1) }; cx_main = (obj)c; }
    r[0] = obj_from_void(0);
    r[1+0] = r[0];
    pc = 0; /* exit from module init */
    r[1+1] = r[0];  
    r += 1; /* shift reg wnd */
    rc = 2;
    goto jump;

case 1: /* main k argv */
    assert(rc == 3);
    r += 1; /* shift reg. wnd */
    /* k argv */
    r[2+0] = r[0];  
    pc = objptr_from_obj(r[2+0])[0];
    r[2+1] = obj_from_ktrap();
    r[2+2] = obj_from_void(printf("Hello, World!\n"));
    r += 2; /* shift reg wnd */
    rreserve(MAX_HOSTREGS);
    rc = 3;
    goto jump;

default: /* inter-host call */
    cxg_hp = hp;
    cxm_rgc(r, MAX_HOSTREGS);
    cxg_rc = rc;
    return pc;
  }
}

/* module load */
void MODULE(void)
{
  obj pc;
  if (!root.next) {
    root.next = cxg_rootp;
    cxg_rootp = &root;
    LOAD();
    pc = obj_from_case(0);
    cxg_rc = 0;
    while (pc) pc = (*(cxhost_t*)pc)(pc); 
    assert(cxg_rc == 2);
  }
}

/* basic runtime */
#define HEAP_SIZE 131072 /* 2^17 */
#define REGS_SIZE 4092

obj *cxg_heap = NULL;
cxoint_t cxg_hmask = 0;
obj *cxg_hp = NULL;
static cxroot_t cxg_root = { 0, NULL, NULL };
cxroot_t *cxg_rootp = &cxg_root;
obj *cxg_regs = NULL, *cxg_rend = NULL;
int cxg_rc = 0;
char **cxg_argv = NULL;

static obj *cxg_heap2 = NULL;
static size_t cxg_hsize = 0; 
static cxoint_t cxg_hmask2 = 0;
static int cxg_gccount = 0, cxg_bumpcount = 0;

static obj *toheap2(obj* p, obj *hp, obj *h1, cxoint_t m1, obj *h2, cxoint_t m2)
{
  obj o = *p, *op, fo, *fop;
  if (((char*)(o) - (char*)h1) & m1) return hp;
  fo = (op = objptr_from_obj(o))[-1]; assert(fo);
  if (notaptr(fo)) {
    fop = op + size_from_obj(fo); while (fop >= op) *--hp = *--fop;
    *p = *fop = obj_from_objptr(hp+1);
  } else if (((char*)(fo) - (char*)h2) & m2) {
    *--hp = *op--; *--hp = *op;
    *p = *op = obj_from_objptr(hp+1);
  } else *p = fo;
  return hp;
}

static void finalize(obj *hp1, obj *he1, obj *h2, cxoint_t m2)
{
  while (hp1 < he1) {
    obj fo = *hp1++; assert(fo);
    if (notaptr(fo)) hp1 += size_from_obj(fo);
    else if (((char*)(fo) - (char*)h2) & m2) ((cxtype_t*)fo)->free((void*)*hp1++);
    else if (notaptr(fo = objptr_from_obj(fo)[-1])) hp1 += size_from_obj(fo);
    else ++hp1;
  } assert(hp1 == he1);
}

static obj *relocate(cxroot_t *pr, obj *regs, obj *regp, 
obj *he2, obj *he1, obj *hp, obj *h1, cxoint_t m1, obj *h2, cxoint_t m2) 
{
  obj *p, *hp1 = hp; hp = he2;
  for (p = regs; p < regp; ++p) hp = toheap2(p, hp, h1, m1, h2, m2);
  for (; pr; pr = pr->next) {
    obj **pp = pr->globv; int c = pr->globc;
    while (c-- > 0) hp = toheap2(*pp++, hp, h1, m1, h2, m2);
  }
  for (p = he2; p > hp; --p) hp = toheap2(p-1, hp, h1, m1, h2, m2);
  if (he1) finalize(hp1, he1, h2, m2);
  return hp;
}

obj *cxm_hgc(obj *regs, obj *regp, obj *hp, size_t needs) 
{
  obj *h1 = cxg_heap, *h2 = cxg_heap2; cxoint_t m1 = cxg_hmask, m2 = cxg_hmask2;
  size_t hs = cxg_hsize; cxroot_t *pr = cxg_rootp;

  obj *h = h1, *he1 = h1 + hs, *he2 = h2 + hs; 
  ++cxg_gccount;
  if (h1) hp = relocate(pr, regs, regp, he2, he1, hp, h1, m1, h2, m2), 
    needs += (h2 + hs - hp)*2; /* make heap half empty */
  else hp = h2 + hs;
  if (hs < needs) {
    size_t s = HEAP_SIZE; while (s < needs) s *= 2;
    m2 = 1 | ~(s*sizeof(obj)-1);
    if (!(h = realloc(h1, s*sizeof(obj)))) { perror("alloc[h]"); exit(2); }
    h1 = h2; h2 = h; he2 = h2 + s; he1 = 0; /* no finalize flag */
    if (h1) hp = relocate(pr, regs, regp, he2, he1, hp, h1, m1, h2, m2);
    else hp = h2 + s;
    if (!(h = realloc(h1, s*sizeof(obj)))) { perror("alloc[h]"); exit(2); }
    hs = s; m1 = m2; ++cxg_bumpcount;
  }
  h1 = h2; h2 = h;

  cxg_heap = h1; cxg_hmask = m1; cxg_heap2 = h2; cxg_hmask2 = m2;
  cxg_hsize = hs; return cxg_hp = hp;
}

obj *cxm_rgc(obj *regs, size_t needs) 
{
  obj *p = cxg_regs; assert(needs > 0);
  if (!p || cxg_rend < p + needs) {
    size_t roff = regs ? regs - p : 0;
    if (!(p = realloc(p, needs*sizeof(obj)))) { perror("alloc[r]"); exit(2); }
    cxg_regs = p; cxg_rend = p + needs;
    regs = p + roff;
  }
  if (regs && regs > p) while (needs--) *p++ = *regs++;
  return cxg_regs;
}

void cxm_check(int x, char *msg)
{
  if (!x) { 
    perror(msg); exit(2); 
  }
}

void *cxm_cknull(void *p, char *msg)
{
  cxm_check(p != NULL, msg); 
  return p;
}

/* os entry point */
int main(int argc, char **argv) {
  int res; obj pc;
  obj retcl[1] = { 0 };
  cxm_rgc(NULL, REGS_SIZE);
  cxg_argv = argv;
  MODULE();
  cxg_regs[0] = cx_main;
  cxg_regs[1] = (obj)retcl;
  cxg_regs[2] = (obj)argv;
  cxg_rc = 3;
  pc = objptr_from_obj(cx_main)[0];
  while (pc) pc = (*(cxhost_t*)pc)(pc); 
  assert(cxg_rc == 3);
  res = (cxg_regs[2] != 0); 
  /* fprintf(stderr, "%d collections, %d reallocs\n", cxg_gccount, cxg_bumpcount); */
  return res; 
}