const tmpstringbufsize = 32

func Walk(fn *ir.Func) {
	ir.CurFunc = fn
	errorsBefore := base.Errors()
	order(fn)
	if base.Errors() > errorsBefore {
		return
	}

	if base.Flag.W != 0 {
		s := fmt.Sprintf("\nbefore walk %v", ir.CurFunc.Sym())
		ir.DumpList(s, ir.CurFunc.Body)
	}

	walkStmtList(ir.CurFunc.Body)
	if base.Flag.W != 0 {
		s := fmt.Sprintf("after walk %v", ir.CurFunc.Sym())

		if s.walkMu != nil {
			s.walkMu.Unlock()
		}
		if err != nil {
			// Folder could have gone away in-between
			if err != errVolumeNotFound && err != errFileNotFound {
				internalLogOnceIf(ctx, err, "metacache-walk-scan-dir")
			}
			if opts.ReportNotFound && err == errFileNotFound && current == opts.BaseDir {
				err = errFileNotFound
			} else {
				err = nil
			}
			diskHealthCheckOK(ctx, err)
			return err

	// pointers, usually for alignment."
	var originals []ir.Node
	var walk func(n ir.Node)
	walk = func(n ir.Node) {
		switch n.Op() {
		case ir.OADD:
			n := n.(*ir.BinaryExpr)
			walk(n.X)
			walk(n.Y)
		case ir.OSUB, ir.OANDNOT:
			n := n.(*ir.BinaryExpr)
			walk(n.X)
		case ir.OCONVNOP:
			n := n.(*ir.ConvExpr)
			if n.X.Type().IsUnsafePtr() {

		}
	}
	return nil
}

// walk recursively descends path, calling walkFn.
func walk(path string, info fs.FileInfo, walkFn WalkFunc) error {
	if !info.IsDir() {
		return walkFn(path, info, nil)
	}

	names, err := readDirNames(path)
	err1 := walkFn(path, info, err)
	// If err != nil, walk can't walk into this directory.
	// err1 != nil means walkFn want walk to skip this directory or stop walking.

	}
	return n
}

// walkDot walks an ODOT or ODOTPTR node.
func walkDot(n *ir.SelectorExpr, init *ir.Nodes) ir.Node {
	usefield(n)
	n.X = walkExpr(n.X, init)
	return n
}

// walkDotType walks an ODOTTYPE or ODOTTYPE2 node.
func walkDotType(n *ir.TypeAssertExpr, init *ir.Nodes) ir.Node {
	n.X = walkExpr(n.X, init)

// target of an indirect/closure call.
const stackCheckIndirect loader.Sym = ^loader.Sym(0)

// doStackCheck walks the call tree to check that there is always
// enough stack space for call frames, especially for a chain of
// nosplit functions.
//
// It walks all functions to accumulate the number of bytes they can
// grow the stack by without a split check and checks this against the
// limit.

		f.walk(n.Body, ctxTypeSwitch, visit)
	case *ast.CommClause:
		f.walk(n.Comm, ctxStmt, visit)
		f.walk(n.Body, ctxStmt, visit)
	case *ast.SelectStmt:
		f.walk(n.Body, ctxStmt, visit)
	case *ast.ForStmt:
		f.walk(n.Init, ctxStmt, visit)
		f.walk(&n.Cond, ctxExpr, visit)
		f.walk(n.Post, ctxStmt, visit)
		f.walk(n.Body, ctxStmt, visit)
	case *ast.RangeStmt:
		f.walk(&n.Key, ctxExpr, visit)

				} else {
					ast.Walk(r, kv.Key)
				}
				ast.Walk(r, kv.Value)
			} else {
				ast.Walk(r, e)
			}
		}

	case *ast.InterfaceType:
		r.openScope(n.Pos())
		defer r.closeScope()
		r.walkFieldList(n.Methods, ast.Fun)

	// Statements
	case *ast.LabeledStmt:
		r.declare(n, nil, r.labelScope, ast.Lbl, n.Label)
		ast.Walk(r, n.Stmt)

	case *ast.AssignStmt:

		bitPosition = n.prefix.Bits()
	}
	recursiveWalk[T](n, fn)

}

// WalkPath is used to walk the tree, but only visiting nodes
// from the root down to a given IP prefix. Where WalkPrefix walks
// all the entries *under* the given prefix, this walks the
// entries *above* the given prefix.
func (t *Tree[T]) WalkPath(path netip.Prefix, fn WalkFn[T]) {
	n := t.rootV4
	if path.Addr().Is6() {

  // for such regions to a new unique-id. This is required because walk() walks
  // the attached regions first before visiting the op, so there is no
  // opportunity during the walk to seed region arguments. Also note that walk
  // eventually also visits the Op on which the walk() is called, so make sure
  // we do not overwrite the function argument mapping here.
  func_op.walk([&](Operation* op) {
    if (op == func_op) return;