libgo/go/runtime/iface.go - gofrontend - Git at Google

 // Copyright 2014 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.

 package runtime

 import (
 	"unsafe"
 )

 // For gccgo, use go:linkname to rename compiler-called functions to
 // themselves, so that the compiler will export them.
 //
 //go:linkname requireitab runtime.requireitab
 //go:linkname assertitab runtime.assertitab
 //go:linkname assertI2T runtime.assertI2T
 //go:linkname ifacetypeeq runtime.ifacetypeeq
 //go:linkname efacetype runtime.efacetype
 //go:linkname ifacetype runtime.ifacetype
 //go:linkname ifaceE2E2 runtime.ifaceE2E2
 //go:linkname ifaceI2E2 runtime.ifaceI2E2
 //go:linkname ifaceE2I2 runtime.ifaceE2I2
 //go:linkname ifaceI2I2 runtime.ifaceI2I2
 //go:linkname ifaceE2T2P runtime.ifaceE2T2P
 //go:linkname ifaceI2T2P runtime.ifaceI2T2P
 //go:linkname ifaceE2T2 runtime.ifaceE2T2
 //go:linkname ifaceI2T2 runtime.ifaceI2T2
 //go:linkname ifaceT2Ip runtime.ifaceT2Ip
 // Temporary for C code to call:
 //go:linkname getitab runtime.getitab

 // The gccgo itab structure is different than the gc one.
 //
 // Both gccgo and gc represent empty interfaces the same way:
 // a two field struct, where the first field points to a type descriptor
 // (a *_type) and the second field is the data pointer.
 //
 // Non-empty interfaces are also two-field structs, and the second
 // field is the data pointer. However, for gccgo, the first field, the
 // itab field, is different. The itab field points to the interface
 // method table, which is the implemention of a specific interface
 // type for a specific dynamic non-interface type.  An interface
 // method table is a list of pointer values. The first pointer is the
 // type descriptor (a *_type) for the dynamic type. The subsequent
 // pointers are pointers to function code, which implement the methods
 // required by the interface. The pointers are sorted by name.
 //
 // The method pointers in the itab are C function pointers, not Go
 // function pointers; they may be called directly, and they have no
 // closures. The receiver is always passed as a pointer, and it is
 // always the same pointer stored in the interface value. A value
 // method starts by copying the receiver value out of the pointer into
 // a local variable.
 //
 // A method call on an interface value is by definition calling a
 // method at a known index m in the list of methods. Given a non-empty
 // interface value i, the call i.m(args) looks like
 //     i.itab[m+1](i.iface, args)

 // Both an empty interface and a non-empty interface have a data
 // pointer field. The meaning of this field is determined by the
 // kindDirectIface bit in the `kind` field of the type descriptor of
 // the value stored in the interface. If kindDirectIface is set, then
 // the data pointer field in the interface value is exactly the value
 // stored in the interface. Otherwise, the data pointer field is a
 // pointer to memory that holds the value. It follows from this that
 // kindDirectIface can only be set for a type whose representation is
 // simply a pointer. In the current gccgo implementation, this is set
 // only for pointer types (including unsafe.Pointer). In the future it
 // could also be set for other types: channels, maps, functions,
 // single-field structs and single-element arrays whose single field
 // is simply a pointer.

 // For a nil interface value both fields in the interface struct are nil.

 // Return the interface method table for a value of type rhs converted
 // to an interface of type lhs.
 func getitab(lhs, rhs *_type, canfail bool) unsafe.Pointer {
 	if rhs == nil {
 		return nil
 	}

 	if lhs.kind&kindMask != kindInterface {
 		throw("getitab called for non-interface type")
 	}

 	lhsi := (*interfacetype)(unsafe.Pointer(lhs))

 	if len(lhsi.methods) == 0 {
 		throw("getitab called for empty interface type")
 	}

 	if rhs.uncommontype == nil || len(rhs.methods) == 0 {
 		if canfail {
 			return nil
 		}
 		panic(&TypeAssertionError{nil, rhs, lhs, *lhsi.methods[0].name})
 	}

 	methods := make([]unsafe.Pointer, len(lhsi.methods)+1)
 	methods[0] = unsafe.Pointer(rhs)

 	ri := 0
 	for li := range lhsi.methods {
 		lhsMethod := &lhsi.methods[li]
 		var rhsMethod *method

 		for {
 			if ri >= len(rhs.methods) {
 				if canfail {
 					return nil
 				}
 				panic(&TypeAssertionError{nil, rhs, lhs, *lhsMethod.name})
 			}

 			rhsMethod = &rhs.methods[ri]
 			if (lhsMethod.name == rhsMethod.name || *lhsMethod.name == *rhsMethod.name) &&
 				(lhsMethod.pkgPath == rhsMethod.pkgPath || *lhsMethod.pkgPath == *rhsMethod.pkgPath) {
 				break
 			}

 			ri++
 		}

 		if !eqtype(lhsMethod.typ, rhsMethod.mtyp) {
 			if canfail {
 				return nil
 			}
 			panic(&TypeAssertionError{nil, rhs, lhs, *lhsMethod.name})
 		}

 		methods[li+1] = unsafe.Pointer(rhsMethod.tfn)
 		ri++
 	}

 	return unsafe.Pointer(&methods[0])
 }

 // Return the interface method table for a value of type rhs converted
 // to an interface of type lhs.  Panics if the conversion is impossible.
 func requireitab(lhs, rhs *_type) unsafe.Pointer {
 	return getitab(lhs, rhs, false)
 }

 // Return the interface method table for a value of type rhs converted
 // to an interface of type lhs.  Panics if the conversion is
 // impossible or if the rhs type is nil.
 func assertitab(lhs, rhs *_type) unsafe.Pointer {
 	if rhs == nil {
 		panic(&TypeAssertionError{nil, nil, lhs, ""})
 	}

 	if lhs.kind&kindMask != kindInterface {
 		throw("assertitab called for non-interface type")
 	}

 	lhsi := (*interfacetype)(unsafe.Pointer(lhs))

 	if len(lhsi.methods) == 0 {
 		return unsafe.Pointer(rhs)
 	}

 	return getitab(lhs, rhs, false)
 }

 // Check whether an interface type may be converted to a non-interface
 // type, panicing if not.
 func assertI2T(lhs, rhs, inter *_type) {
 	if rhs == nil {
 		panic(&TypeAssertionError{nil, nil, lhs, ""})
 	}
 	if !eqtype(lhs, rhs) {
 		panic(&TypeAssertionError{inter, rhs, lhs, ""})
 	}
 }

 // Compare two type descriptors for equality.
 func ifacetypeeq(a, b *_type) bool {
 	return eqtype(a, b)
 }

 // Return the type descriptor of an empty interface.
 // FIXME: This should be inlined by the compiler.
 func efacetype(e eface) *_type {
 	return e._type
 }

 // Return the type descriptor of a non-empty interface.
 // FIXME: This should be inlined by the compiler.
 func ifacetype(i iface) *_type {
 	if i.tab == nil {
 		return nil
 	}
 	return *(**_type)(i.tab)
 }

 // Convert an empty interface to an empty interface, for a comma-ok
 // type assertion.
 func ifaceE2E2(e eface) (eface, bool) {
 	return e, e._type != nil
 }

 // Convert a non-empty interface to an empty interface, for a comma-ok
 // type assertion.
 func ifaceI2E2(i iface) (eface, bool) {
 	if i.tab == nil {
 		return eface{nil, nil}, false
 	} else {
 		return eface{*(**_type)(i.tab), i.data}, true
 	}
 }

 // Convert an empty interface to a non-empty interface, for a comma-ok
 // type assertion.
 func ifaceE2I2(inter *_type, e eface) (iface, bool) {
 	if e._type == nil {
 		return iface{nil, nil}, false
 	} else {
 		itab := getitab(inter, e._type, true)
 		if itab == nil {
 			return iface{nil, nil}, false
 		} else {
 			return iface{itab, e.data}, true
 		}
 	}
 }

 // Convert a non-empty interface to a non-empty interface, for a
 // comma-ok type assertion.
 func ifaceI2I2(inter *_type, i iface) (iface, bool) {
 	if i.tab == nil {
 		return iface{nil, nil}, false
 	} else {
 		itab := getitab(inter, *(**_type)(i.tab), true)
 		if itab == nil {
 			return iface{nil, nil}, false
 		} else {
 			return iface{itab, i.data}, true
 		}
 	}
 }

 // Convert an empty interface to a pointer non-interface type.
 func ifaceE2T2P(t *_type, e eface) (unsafe.Pointer, bool) {
 	if !eqtype(t, e._type) {
 		return nil, false
 	} else {
 		return e.data, true
 	}
 }

 // Convert a non-empty interface to a pointer non-interface type.
 func ifaceI2T2P(t *_type, i iface) (unsafe.Pointer, bool) {
 	if i.tab == nil || !eqtype(t, *(**_type)(i.tab)) {
 		return nil, false
 	} else {
 		return i.data, true
 	}
 }

 // Convert an empty interface to a non-pointer non-interface type.
 func ifaceE2T2(t *_type, e eface, ret unsafe.Pointer) bool {
 	if !eqtype(t, e._type) {
 		typedmemclr(t, ret)
 		return false
 	} else {
 		typedmemmove(t, ret, e.data)
 		return true
 	}
 }

 // Convert a non-empty interface to a non-pointer non-interface type.
 func ifaceI2T2(t *_type, i iface, ret unsafe.Pointer) bool {
 	if i.tab == nil || !eqtype(t, *(**_type)(i.tab)) {
 		typedmemclr(t, ret)
 		return false
 	} else {
 		typedmemmove(t, ret, i.data)
 		return true
 	}
 }

 // Return whether we can convert a type to an interface type.
 func ifaceT2Ip(to, from *_type) bool {
 	if from == nil {
 		return false
 	}

 	if to.kind&kindMask != kindInterface {
 		throw("ifaceT2Ip called with non-interface type")
 	}
 	toi := (*interfacetype)(unsafe.Pointer(to))

 	if from.uncommontype == nil || len(from.methods) == 0 {
 		return len(toi.methods) == 0
 	}

 	ri := 0
 	for li := range toi.methods {
 		toMethod := &toi.methods[li]
 		var fromMethod *method
 		for {
 			if ri >= len(from.methods) {
 				return false
 			}

 			fromMethod = &from.methods[ri]
 			if (toMethod.name == fromMethod.name || *toMethod.name == *fromMethod.name) &&
 				(toMethod.pkgPath == fromMethod.pkgPath || *toMethod.pkgPath == *fromMethod.pkgPath) {
 				break
 			}

 			ri++
 		}

 		if !eqtype(fromMethod.mtyp, toMethod.typ) {
 			return false
 		}

 		ri++
 	}

 	return true
 }

 //go:linkname reflect_ifaceE2I reflect.ifaceE2I
 func reflect_ifaceE2I(inter *interfacetype, e eface, dst *iface) {
 	t := e._type
 	if t == nil {
 		panic(TypeAssertionError{nil, nil, &inter.typ, ""})
 	}
 	dst.tab = requireitab((*_type)(unsafe.Pointer(inter)), t)
 	dst.data = e.data
 }

 // staticbytes is used to avoid convT2E for byte-sized values.
 var staticbytes = [...]byte{
 	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
 	0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
 	0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
 	0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
 	0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
 	0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
 	0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
 	0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
 	0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
 	0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
 	0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
 	0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
 	0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
 	0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
 	0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
 	0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
 	0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
 	0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
 	0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
 	0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
 	0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
 	0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
 	0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
 	0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
 	0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
 	0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
 	0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
 	0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
 	0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
 	0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
 	0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
 	0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff,
 }
	// Copyright 2014 The Go Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style
	// license that can be found in the LICENSE file.

	package runtime

	import (
	"unsafe"
	)

	// For gccgo, use go:linkname to rename compiler-called functions to
	// themselves, so that the compiler will export them.
	//
	//go:linkname requireitab runtime.requireitab
	//go:linkname assertitab runtime.assertitab
	//go:linkname assertI2T runtime.assertI2T
	//go:linkname ifacetypeeq runtime.ifacetypeeq
	//go:linkname efacetype runtime.efacetype
	//go:linkname ifacetype runtime.ifacetype
	//go:linkname ifaceE2E2 runtime.ifaceE2E2
	//go:linkname ifaceI2E2 runtime.ifaceI2E2
	//go:linkname ifaceE2I2 runtime.ifaceE2I2
	//go:linkname ifaceI2I2 runtime.ifaceI2I2
	//go:linkname ifaceE2T2P runtime.ifaceE2T2P
	//go:linkname ifaceI2T2P runtime.ifaceI2T2P
	//go:linkname ifaceE2T2 runtime.ifaceE2T2
	//go:linkname ifaceI2T2 runtime.ifaceI2T2
	//go:linkname ifaceT2Ip runtime.ifaceT2Ip
	// Temporary for C code to call:
	//go:linkname getitab runtime.getitab

	// The gccgo itab structure is different than the gc one.
	//
	// Both gccgo and gc represent empty interfaces the same way:
	// a two field struct, where the first field points to a type descriptor
	// (a *_type) and the second field is the data pointer.
	//
	// Non-empty interfaces are also two-field structs, and the second
	// field is the data pointer. However, for gccgo, the first field, the
	// itab field, is different. The itab field points to the interface
	// method table, which is the implemention of a specific interface
	// type for a specific dynamic non-interface type. An interface
	// method table is a list of pointer values. The first pointer is the
	// type descriptor (a *_type) for the dynamic type. The subsequent
	// pointers are pointers to function code, which implement the methods
	// required by the interface. The pointers are sorted by name.
	//
	// The method pointers in the itab are C function pointers, not Go
	// function pointers; they may be called directly, and they have no
	// closures. The receiver is always passed as a pointer, and it is
	// always the same pointer stored in the interface value. A value
	// method starts by copying the receiver value out of the pointer into
	// a local variable.
	//
	// A method call on an interface value is by definition calling a
	// method at a known index m in the list of methods. Given a non-empty
	// interface value i, the call i.m(args) looks like
	// i.itab[m+1](i.iface, args)

	// Both an empty interface and a non-empty interface have a data
	// pointer field. The meaning of this field is determined by the
	// kindDirectIface bit in the `kind` field of the type descriptor of
	// the value stored in the interface. If kindDirectIface is set, then
	// the data pointer field in the interface value is exactly the value
	// stored in the interface. Otherwise, the data pointer field is a
	// pointer to memory that holds the value. It follows from this that
	// kindDirectIface can only be set for a type whose representation is
	// simply a pointer. In the current gccgo implementation, this is set
	// only for pointer types (including unsafe.Pointer). In the future it
	// could also be set for other types: channels, maps, functions,
	// single-field structs and single-element arrays whose single field
	// is simply a pointer.

	// For a nil interface value both fields in the interface struct are nil.

	// Return the interface method table for a value of type rhs converted
	// to an interface of type lhs.
	func getitab(lhs, rhs *_type, canfail bool) unsafe.Pointer {
	if rhs == nil {
	return nil
	}

	if lhs.kind&kindMask != kindInterface {
	throw("getitab called for non-interface type")
	}

	lhsi := (*interfacetype)(unsafe.Pointer(lhs))

	if len(lhsi.methods) == 0 {
	throw("getitab called for empty interface type")
	}

	if rhs.uncommontype == nil \|\| len(rhs.methods) == 0 {
	if canfail {
	return nil
	}
	panic(&TypeAssertionError{nil, rhs, lhs, *lhsi.methods[0].name})
	}

	methods := make([]unsafe.Pointer, len(lhsi.methods)+1)
	methods[0] = unsafe.Pointer(rhs)

	ri := 0
	for li := range lhsi.methods {
	lhsMethod := &lhsi.methods[li]
	var rhsMethod *method

	for {
	if ri >= len(rhs.methods) {
	if canfail {
	return nil
	}
	panic(&TypeAssertionError{nil, rhs, lhs, *lhsMethod.name})
	}

	rhsMethod = &rhs.methods[ri]
	if (lhsMethod.name == rhsMethod.name \|\| lhsMethod.name == rhsMethod.name) &&
	(lhsMethod.pkgPath == rhsMethod.pkgPath \|\| lhsMethod.pkgPath == rhsMethod.pkgPath) {
	break
	}

	ri++
	}

	if !eqtype(lhsMethod.typ, rhsMethod.mtyp) {
	if canfail {
	return nil
	}
	panic(&TypeAssertionError{nil, rhs, lhs, *lhsMethod.name})
	}

	methods[li+1] = unsafe.Pointer(rhsMethod.tfn)
	ri++
	}

	return unsafe.Pointer(&methods[0])
	}

	// Return the interface method table for a value of type rhs converted
	// to an interface of type lhs. Panics if the conversion is impossible.
	func requireitab(lhs, rhs *_type) unsafe.Pointer {
	return getitab(lhs, rhs, false)
	}

	// Return the interface method table for a value of type rhs converted
	// to an interface of type lhs. Panics if the conversion is
	// impossible or if the rhs type is nil.
	func assertitab(lhs, rhs *_type) unsafe.Pointer {
	if rhs == nil {
	panic(&TypeAssertionError{nil, nil, lhs, ""})
	}

	if lhs.kind&kindMask != kindInterface {
	throw("assertitab called for non-interface type")
	}

	lhsi := (*interfacetype)(unsafe.Pointer(lhs))

	if len(lhsi.methods) == 0 {
	return unsafe.Pointer(rhs)
	}

	return getitab(lhs, rhs, false)
	}

	// Check whether an interface type may be converted to a non-interface
	// type, panicing if not.
	func assertI2T(lhs, rhs, inter *_type) {
	if rhs == nil {
	panic(&TypeAssertionError{nil, nil, lhs, ""})
	}
	if !eqtype(lhs, rhs) {
	panic(&TypeAssertionError{inter, rhs, lhs, ""})
	}
	}

	// Compare two type descriptors for equality.
	func ifacetypeeq(a, b *_type) bool {
	return eqtype(a, b)
	}

	// Return the type descriptor of an empty interface.
	// FIXME: This should be inlined by the compiler.
	func efacetype(e eface) *_type {
	return e._type
	}

	// Return the type descriptor of a non-empty interface.
	// FIXME: This should be inlined by the compiler.
	func ifacetype(i iface) *_type {
	if i.tab == nil {
	return nil
	}
	return (*_type)(i.tab)
	}

	// Convert an empty interface to an empty interface, for a comma-ok
	// type assertion.
	func ifaceE2E2(e eface) (eface, bool) {
	return e, e._type != nil
	}

	// Convert a non-empty interface to an empty interface, for a comma-ok
	// type assertion.
	func ifaceI2E2(i iface) (eface, bool) {
	if i.tab == nil {
	return eface{nil, nil}, false
	} else {
	return eface{(*_type)(i.tab), i.data}, true
	}
	}

	// Convert an empty interface to a non-empty interface, for a comma-ok
	// type assertion.
	func ifaceE2I2(inter *_type, e eface) (iface, bool) {
	if e._type == nil {
	return iface{nil, nil}, false
	} else {
	itab := getitab(inter, e._type, true)
	if itab == nil {
	return iface{nil, nil}, false
	} else {
	return iface{itab, e.data}, true
	}
	}
	}

	// Convert a non-empty interface to a non-empty interface, for a
	// comma-ok type assertion.
	func ifaceI2I2(inter *_type, i iface) (iface, bool) {
	if i.tab == nil {
	return iface{nil, nil}, false
	} else {
	itab := getitab(inter, (*_type)(i.tab), true)
	if itab == nil {
	return iface{nil, nil}, false
	} else {
	return iface{itab, i.data}, true
	}
	}
	}

	// Convert an empty interface to a pointer non-interface type.
	func ifaceE2T2P(t *_type, e eface) (unsafe.Pointer, bool) {
	if !eqtype(t, e._type) {
	return nil, false
	} else {
	return e.data, true
	}
	}

	// Convert a non-empty interface to a pointer non-interface type.
	func ifaceI2T2P(t *_type, i iface) (unsafe.Pointer, bool) {
	if i.tab == nil \|\| !eqtype(t, (*_type)(i.tab)) {
	return nil, false
	} else {
	return i.data, true
	}
	}

	// Convert an empty interface to a non-pointer non-interface type.
	func ifaceE2T2(t *_type, e eface, ret unsafe.Pointer) bool {
	if !eqtype(t, e._type) {
	typedmemclr(t, ret)
	return false
	} else {
	typedmemmove(t, ret, e.data)
	return true
	}
	}

	// Convert a non-empty interface to a non-pointer non-interface type.
	func ifaceI2T2(t *_type, i iface, ret unsafe.Pointer) bool {
	if i.tab == nil \|\| !eqtype(t, (*_type)(i.tab)) {
	typedmemclr(t, ret)
	return false
	} else {
	typedmemmove(t, ret, i.data)
	return true
	}
	}

	// Return whether we can convert a type to an interface type.
	func ifaceT2Ip(to, from *_type) bool {
	if from == nil {
	return false
	}

	if to.kind&kindMask != kindInterface {
	throw("ifaceT2Ip called with non-interface type")
	}
	toi := (*interfacetype)(unsafe.Pointer(to))

	if from.uncommontype == nil \|\| len(from.methods) == 0 {
	return len(toi.methods) == 0
	}

	ri := 0
	for li := range toi.methods {
	toMethod := &toi.methods[li]
	var fromMethod *method
	for {
	if ri >= len(from.methods) {
	return false
	}

	fromMethod = &from.methods[ri]
	if (toMethod.name == fromMethod.name \|\| toMethod.name == fromMethod.name) &&
	(toMethod.pkgPath == fromMethod.pkgPath \|\| toMethod.pkgPath == fromMethod.pkgPath) {
	break
	}

	ri++
	}

	if !eqtype(fromMethod.mtyp, toMethod.typ) {
	return false
	}

	ri++
	}

	return true
	}

	//go:linkname reflect_ifaceE2I reflect.ifaceE2I
	func reflect_ifaceE2I(inter interfacetype, e eface, dst iface) {
	t := e._type
	if t == nil {
	panic(TypeAssertionError{nil, nil, &inter.typ, ""})
	}
	dst.tab = requireitab((*_type)(unsafe.Pointer(inter)), t)
	dst.data = e.data
	}

	// staticbytes is used to avoid convT2E for byte-sized values.
	var staticbytes = [...]byte{
	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
	0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
	0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
	0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
	0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
	0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
	0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
	0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
	0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
	0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
	0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
	0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
	0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
	0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
	0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
	0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
	0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
	0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
	0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
	0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
	0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
	0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
	0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
	0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
	0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
	0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
	0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
	0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
	0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
	0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
	0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
	0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff,
	}