lastGs map[int32]uint64
	lastP  int32
}

func (p *parser) discard(n uint64) bool {
	if n > math.MaxInt {
		return false
	}
	if noff := p.off + int(n); noff < p.off || noff > len(p.data) {
		return false
	} else {
		p.off = noff
	}
	return true
}

func newParser(r io.Reader, ver version.Version) (*parser, error) {
	var buf []byte
	if seeker, ok := r.(io.Seeker); ok {

}

// like staticassign but we are copying an already
// initialized value r.
func (s *Schedule) staticcopy(l *ir.Name, loff int64, rn *ir.Name, typ *types.Type) bool {
	if rn.Class == ir.PFUNC {
		// TODO if roff != 0 { panic }
		staticdata.InitAddr(l, loff, staticdata.FuncLinksym(rn))
		return true
	}
	if rn.Class != ir.PEXTERN || rn.Sym().Pkg != types.LocalPkg {
		return false
	}

		cgoCheckBits(src, typ.GCData, off, size)
		return
	}

	// The type has a GC program. Try to find GC bits somewhere else.
	for _, datap := range activeModules() {
		if cgoInRange(src, datap.data, datap.edata) {
			doff := uintptr(src) - datap.data
			cgoCheckBits(add(src, -doff), datap.gcdatamask.bytedata, off+doff, size)
			return
		}
		if cgoInRange(src, datap.bss, datap.ebss) {
			boff := uintptr(src) - datap.bss

}

/*
 * look for the next file in an archive.
 * adapted from libmach.
 */
func nextar(bp *bio.Reader, off int64, a *ArHdr) int64 {
	if off&1 != 0 {
		off++
	}
	bp.MustSeek(off, 0)
	var buf [SAR_HDR]byte
	if n, err := io.ReadFull(bp, buf[:]); err != nil {
		if n == 0 && err != io.EOF {
			return -1
		}
		return 0
	}

		return nil, false
	}

	// Page-align the offset.
	off := r.Offset()
	align := syscall.Getpagesize()
	aoff := off &^ int64(align-1)

	data, err := syscall.Mmap(int(r.f.Fd()), aoff, int(length+uint64(off-aoff)), syscall.PROT_READ, syscall.MAP_SHARED|syscall.MAP_FILE)
	if err != nil {
		return nil, false
	}

	data = data[off-aoff:]
	r.MustSeek(int64(length), 1)
	return data, true

	off := objw.Uint32(lsym, 0, uint32(nbitmap))
	off = objw.Uint32(lsym, off, uint32(bv.N))
	off = objw.BitVec(lsym, off, bv)

	if fn.Type().NumResults() > 0 {
		for _, p := range abiInfo.OutParams() {
			if len(p.Registers) == 0 {
				typebits.SetNoCheck(p.Type, p.FrameOffset(abiInfo), bv)
			}
		}
		off = objw.BitVec(lsym, off, bv)
	}

	nFuncs := len(b.funcs)
	var foff int64 = coverage.CovMetaHeaderSize + int64(b.stab.Size()) + int64(nFuncs)*4
	for idx := 0; idx < nFuncs; idx++ {
		b.wrUint32(w, uint32(foff))
		foff += int64(len(b.funcs[idx].encoded))
	}
	return off + (int64(len(b.funcs)) * 4)
}

func (b *CoverageMetaDataBuilder) emitFunc(w io.WriteSeeker, off int64, f funcDesc) (int64, error) {

	}

	if off := typedieof(ptrastructTypeDIE); off != astructTypeDIE.Offset {
		t.Errorf("type attribute of *main.astruct references %#x, not main.astruct DIE at %#x\n", off, astructTypeDIE.Offset)
	}

	if off := typedieof(globalptrDIE); off != ptrastructTypeDIE.Offset {
		t.Errorf("type attribute of main.globalptr references %#x, not *main.astruct DIE at %#x\n", off, ptrastructTypeDIE.Offset)
	}

	return v
}

// funcName returns the name of the function found at off.
func (t *LineTable) funcName(off uint32) string {
	if s, ok := t.funcNames[off]; ok {
		return s
	}
	i := bytes.IndexByte(t.funcnametab[off:], 0)
	s := string(t.funcnametab[off : off+uint32(i)])
	t.funcNames[off] = s
	return s
}

// stringFrom returns a Go string found at off from a position.

	// millisecond.
	tcpKeepAliveIdle := uint32(roundDurationUp(idle, time.Millisecond))
	tcpKeepAliveInterval := uint32(roundDurationUp(interval, time.Millisecond))
	ka := syscall.TCPKeepalive{
		OnOff:    1,
		Time:     tcpKeepAliveIdle,
		Interval: tcpKeepAliveInterval,
	}
	ret := uint32(0)
	size := uint32(unsafe.Sizeof(ka))