// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package runtime

import "internal/abi"

// isDirectIface reports whether t is stored directly in an interface value.
func isDirectIface(t *_type) bool {
	return t.Kind_&abi.KindDirectIface != 0

		// the error text (e.g. in a struct with a field of slice type
		// we want to report the struct, not the slice).
		panic(errorString("hash of unhashable type " + toRType(t).string()))
	}
	if isDirectIface(t) {
		return c1 * typehash(t, unsafe.Pointer(&a.data), h^c0)
	} else {
		return c1 * typehash(t, a.data, h^c0)
	}
}

// nilinterhash should be an internal detail,

// The concrete type must be known to have type t.
// It follows the pointer if !IsDirectIface(t).
func ifaceData(pos src.XPos, n ir.Node, t *types.Type) ir.Node {
	if t.IsInterface() {
		base.Fatalf("ifaceData interface: %v", t)
	}
	ptr := ir.NewUnaryExpr(pos, ir.OIDATA, n)
	if types.IsDirectIface(t) {
		ptr.SetType(t)
		ptr.SetTypecheck(1)
		return ptr
	}
	ptr.SetType(types.NewPtr(t))

			"alignDown",
			"alignUp",
			"bucketMask",
			"bucketShift",
			"chanbuf",
			"evacuated",
			"fastlog2",
			"float64bits",
			"funcspdelta",
			"getm",
			"getMCache",
			"isDirectIface",
			"itabHashFunc",
			"nextslicecap",
			"noescape",
			"pcvalueCacheKey",
			"rand32",
			"readUnaligned32",
			"readUnaligned64",
			"releasem",
			"roundupsize",
			"stackmapdata",

// IfaceIndir reports whether t is stored indirectly in an interface value.
func (t *Type) IfaceIndir() bool {
	return t.Kind_&KindDirectIface == 0
}

// isDirectIface reports whether t is stored directly in an interface value.
func (t *Type) IsDirectIface() bool {
	return t.Kind_&KindDirectIface != 0
}

func (t *Type) GcSlice(begin, end uintptr) []byte {
	return unsafe.Slice(t.GCData, int(end))[begin:]
}

		return true

	case TARRAY:
		// Array of 1 direct iface type can be direct.
		return t.NumElem() == 1 && IsDirectIface(t.Elem())

	case TSTRUCT:
		// Struct with 1 field of direct iface type can be direct.
		return t.NumFields() == 1 && IsDirectIface(t.Field(0).Type)
	}

	return false
}

// IsInterfaceMethod reports whether (field) m is
// an interface method. Such methods have the

		n := n.(*ir.ConvExpr)
		val := ir.Node(n)
		for val.Op() == ir.OCONVIFACE {
			val = val.(*ir.ConvExpr).X
		}
		if val.Type().IsInterface() {
			return val.Op() == ir.ONIL
		}
		if types.IsDirectIface(val.Type()) && val.Op() == ir.ONIL {
			return true
		}
		return isStaticCompositeLiteral(val)
	}
	return false
}

// initKind is a kind of static initialization: static, dynamic, or local.

// an interface.
func dataWord(conv *ir.ConvExpr, init *ir.Nodes) ir.Node {
	pos, n := conv.Pos(), conv.X
	fromType := n.Type()

	// If it's a pointer, it is its own representation.
	if types.IsDirectIface(fromType) {
		return n
	}

	isInteger := fromType.IsInteger()
	isBool := fromType.IsBoolean()
	if sc := fromType.SoleComponent(); sc != nil {
		isInteger = sc.IsInteger()
		isBool = sc.IsBoolean()

		}

		// Create a copy of l to modify while we emit data.

		// Emit itab, advance offset.
		staticdata.InitAddr(l, loff, itab.X.(*ir.LinksymOffsetExpr).Linksym)

		// Emit data.
		if types.IsDirectIface(val.Type()) {
			if val.Op() == ir.ONIL {
				// Nil is zero, nothing to do.
				return true
			}
			// Copy val directly into n.
			ir.SetPos(val)
			assign(base.Pos, l, loff+int64(types.PtrSize), val)

			n.Prealloc = o.newTemp(t, false)
		}
		return n

	case ir.ODOTTYPE, ir.ODOTTYPE2:
		n := n.(*ir.TypeAssertExpr)
		n.X = o.expr(n.X, nil)
		if !types.IsDirectIface(n.Type()) || base.Flag.Cfg.Instrumenting {
			return o.copyExprClear(n)
		}
		return n

	case ir.ORECV:
		n := n.(*ir.UnaryExpr)
		n.X = o.expr(n.X, nil)
		return o.copyExprClear(n)