コード例 #1
0
ファイル: glkop.cpp プロジェクト: fingolfin/scummvm
uint Glulxe::ReadMemory(uint addr) {
	if (addr == 0xffffffff) {
		stackptr -= 4;
		return Stk4(stackptr);
	} else {
		return Mem4(addr);
	}
}
コード例 #2
0
ファイル: glkop.cpp プロジェクト: fingolfin/scummvm
uint Glulxe::ReadStructField(uint addr, uint fieldnum) {
	if (addr == 0xffffffff) {
		stackptr -= 4;
		return Stk4(stackptr);
	} else {
		return Mem4(addr + (fieldnum * 4));
	}
}
コード例 #3
0
ファイル: serial.c プロジェクト: MikulasZelinka/glulxe
static glui32 write_stackstate(dest_t *dest, int portable)
{
  glui32 res;
  glui32 lx;
  glui32 lastframe;

  /* If we're storing for the purpose of undo, we don't need to do any
     byte-swapping, because the result will only be used by this session. */
  if (!portable) {
    res = write_buffer(dest, stack, stackptr);
    if (res)
      return res;
    return 0;
  }

  /* Write a portable stack image. To do this, we have to write stack
     frames in order, bottom to top. Remember that the last word of
     every stack frame is a pointer to the beginning of that stack frame.
     (This includes the last frame, because the save opcode pushes on
     a call stub before it calls perform_save().) */

  lastframe = (glui32)(-1);
  while (1) {
    glui32 frameend, frm, frm2, frm3;
    unsigned char loctype, loccount;
    glui32 numlocals, frlen, locpos;

    /* Find the next stack frame (after the one in lastframe). Sadly,
       this requires searching the stack from the top down. We have to
       do this for *every* frame, which takes N^2 time overall. But
       save routines usually aren't nested very deep. 
       If it becomes a practical problem, we can build a stack-frame 
       array, which requires dynamic allocation. */
    for (frm = stackptr, frameend = stackptr;
         frm != 0 && (frm2 = Stk4(frm-4)) != lastframe;
         frameend = frm, frm = frm2) { };

    /* Write out the frame. */
    frm2 = frm;

    frlen = Stk4(frm2);
    frm2 += 4;
    res = write_long(dest, frlen);
    if (res)
      return res;
    locpos = Stk4(frm2);
    frm2 += 4;
    res = write_long(dest, locpos);
    if (res)
      return res;

    frm3 = frm2;

    numlocals = 0;
    while (1) {
      loctype = Stk1(frm2);
      frm2 += 1;
      loccount = Stk1(frm2);
      frm2 += 1;

      res = write_byte(dest, loctype);
      if (res)
        return res;
      res = write_byte(dest, loccount);
      if (res)
        return res;

      if (loctype == 0 && loccount == 0)
        break;

      numlocals++;
    }

    if ((numlocals & 1) == 0) {
      res = write_byte(dest, 0);
      if (res)
        return res;
      res = write_byte(dest, 0);
      if (res)
        return res;
      frm2 += 2;
    }

    if (frm2 != frm+locpos)
      fatal_error("Inconsistent stack frame during save.");

    /* Write out the locals. */
    for (lx=0; lx<numlocals; lx++) {
      loctype = Stk1(frm3);
      frm3 += 1;
      loccount = Stk1(frm3);
      frm3 += 1;
      
      if (loctype == 0 && loccount == 0)
        break;

      /* Put in up to 0, 1, or 3 bytes of padding, depending on loctype. */
      while (frm2 & (loctype-1)) {
        res = write_byte(dest, 0);
        if (res)
          return res;
        frm2 += 1;
      }

      /* Put in this set of locals. */
      switch (loctype) {

      case 1:
        do {
          res = write_byte(dest, Stk1(frm2));
          if (res)
            return res;
          frm2 += 1;
          loccount--;
        } while (loccount);
        break;

      case 2:
        do {
          res = write_short(dest, Stk2(frm2));
          if (res)
            return res;
          frm2 += 2;
          loccount--;
        } while (loccount);
        break;

      case 4:
        do {
          res = write_long(dest, Stk4(frm2));
          if (res)
            return res;
          frm2 += 4;
          loccount--;
        } while (loccount);
        break;

      }
    }

    if (frm2 != frm+frlen)
      fatal_error("Inconsistent stack frame during save.");

    while (frm2 < frameend) {
      res = write_long(dest, Stk4(frm2));
      if (res)
        return res;
      frm2 += 4;
    }

    /* Go on to the next frame. */
    if (frameend == stackptr)
      break; /* All done. */
    lastframe = frm;
  }

  return 0;
}