func (st *state) fail(err string) {
	panic(demangleErr{err: err, off: st.off})
}

// failEarlier is like fail, but decrements the offset to indicate
// that the point of failure occurred earlier in the string.
func (st *state) failEarlier(err string, dec int) {
	if st.off < dec {
		panic("internal error")
	}
	panic(demangleErr{err: err, off: st.off - dec})
}

// advance advances the current string offset.

		throw("found bad interior pointer")
	}
	off := interior - x
	tp := span.typePointersOf(interior, size)
	for i := off; i < off+size; i += goarch.PtrSize {
		// Compute the pointer bit we want at offset i.
		want := false
		if i < span.elemsize {
			off := i % typ.Size_
			if off < typ.PtrBytes {
				j := off / goarch.PtrSize
				want = *addb(typ.GCData, j/8)>>(j%8)&1 != 0
			}
		}

		[]ProgHeader{
			{Type: PT_NOTE, Flags: 0x0, Off: 0x3f8, Vaddr: 0x0, Paddr: 0x0, Filesz: 0x8ac, Memsz: 0x0, Align: 0x0},
			{Type: PT_LOAD, Flags: PF_X + PF_R, Off: 0x1000, Vaddr: 0x400000, Paddr: 0x0, Filesz: 0x0, Memsz: 0x1000, Align: 0x1000},
			{Type: PT_LOAD, Flags: PF_R, Off: 0x1000, Vaddr: 0x401000, Paddr: 0x0, Filesz: 0x1000, Memsz: 0x1000, Align: 0x1000},

	}
	return true
}

// isFixed32 returns true if the int32 at offset off in symbol sym
// is known and constant.
func isFixed32(c *Config, sym Sym, off int64) bool {
	return isFixed(c, sym, off, 4)
}

// isFixed returns true if the range [off,off+size] of the symbol sym
// is known and constant.
func isFixed(c *Config, sym Sym, off, size int64) bool {
	lsym := sym.(*obj.LSym)
	if lsym.Extra == nil {

	// These tests are written to avoid any possible overflow.
	off := uintptr(shard) * rootBlockBytes
	if off >= n0 {
		return 0
	}
	b := b0 + off
	ptrmask := (*uint8)(add(unsafe.Pointer(ptrmask0), uintptr(shard)*(rootBlockBytes/(8*goarch.PtrSize))))
	n := uintptr(rootBlockBytes)
	if off+n > n0 {
		n = n0 - off
	}

	// Scan this shard.
	scanblock(b, n, ptrmask, gcw, nil)
	return int64(n)

		off += pad
	}
	if t := n.FuncType.Result; t != nil {
		if off%t.Align != 0 {
			pad := t.Align - off%t.Align
			fmt.Fprintf(&buf, "\t\tchar __pad%d[%d];\n", off, pad)
			off += pad
		}
		fmt.Fprintf(&buf, "\t\t%s r;\n", t.C)
		off += t.Size
	}
	if off%p.PtrSize != 0 {
		pad := p.PtrSize - off%p.PtrSize
		fmt.Fprintf(&buf, "\t\tchar __pad%d[%d];\n", off, pad)
		off += pad

				// is resolved.
				off = alignUp(off, 8)
			} else if size&3 == 0 {
				off = alignUp(off, 4)
			} else if size&1 == 0 {
				off = alignUp(off, 2)
			}
			if off+size <= maxTinySize && c.tiny != 0 {
				// The object fits into existing tiny block.
				x = unsafe.Pointer(c.tiny + off)
				c.tinyoffset = off + size
				c.tinyAllocs++
				mp.mallocing = 0

		}

		reloctab = append(reloctab, xldr)
	}

	off += uint64(16 * len(dynimpreloc))
	reloctab = append(reloctab, dynimpreloc...)

	hdr.Lnreloc = int32(len(reloctab))
	hdr.Limpoff = off

	/* Import */
	// Default import: /usr/lib:/lib
	ldimpf := &XcoffLdImportFile64{
		Limpidpath: "/usr/lib:/lib",
	}

		v1.AuxInt = int32ToAuxInt(off)
		v1.Aux = symToAux(n)
		v.AddArg2(v0, v1)
		return true
	}
	// match: (Arg {n} [off])
	// cond: is64BitInt(v.Type) && config.BigEndian && v.Type.IsSigned() && !(b.Func.pass.name == "decompose builtin")
	// result: (Int64Make (Arg <typ.Int32> {n} [off]) (Arg <typ.UInt32> {n} [off+4]))
	for {
		off := auxIntToInt32(v.AuxInt)
		n := auxToSym(v.Aux)

// don't extend before store
(MOVBstore [off] {sym} ptr (MOVBreg x) mem) => (MOVBstore [off] {sym} ptr x mem)
(MOVBstore [off] {sym} ptr (MOVBUreg x) mem) => (MOVBstore [off] {sym} ptr x mem)
(MOVBstore [off] {sym} ptr (MOVHreg x) mem) => (MOVBstore [off] {sym} ptr x mem)
(MOVBstore [off] {sym} ptr (MOVHUreg x) mem) => (MOVBstore [off] {sym} ptr x mem)
(MOVHstore [off] {sym} ptr (MOVHreg x) mem) => (MOVHstore [off] {sym} ptr x mem)