1 files changed, 0 insertions, 439 deletions
diff --git a/src/pkg/runtime/iface.go b/src/pkg/runtime/iface.go
deleted file mode 100644
index f60b6a79c..000000000
--- a/src/pkg/runtime/iface.go
+++ /dev/null
@@ -1,439 +0,0 @@
-// 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"
-)
-
-const (
-	hashSize = 1009
-)
-
-var (
-	ifaceLock mutex // lock for accessing hash
-	hash      [hashSize]*itab
-)
-
-// fInterface is our standard non-empty interface.  We use it instead
-// of interface{f()} in function prototypes because gofmt insists on
-// putting lots of newlines in the otherwise concise interface{f()}.
-type fInterface interface {
-	f()
-}
-
-func getitab(inter *interfacetype, typ *_type, canfail bool) *itab {
-	if len(inter.mhdr) == 0 {
-		gothrow("internal error - misuse of itab")
-	}
-
-	// easy case
-	x := typ.x
-	if x == nil {
-		if canfail {
-			return nil
-		}
-		i := (*imethod)(add(unsafe.Pointer(inter), unsafe.Sizeof(interfacetype{})))
-		panic(&TypeAssertionError{"", *typ._string, *inter.typ._string, *i.name})
-	}
-
-	// compiler has provided some good hash codes for us.
-	h := inter.typ.hash
-	h += 17 * typ.hash
-	// TODO(rsc): h += 23 * x.mhash ?
-	h %= hashSize
-
-	// look twice - once without lock, once with.
-	// common case will be no lock contention.
-	var m *itab
-	var locked int
-	for locked = 0; locked < 2; locked++ {
-		if locked != 0 {
-			lock(&ifaceLock)
-		}
-		for m = (*itab)(atomicloadp(unsafe.Pointer(&hash[h]))); m != nil; m = m.link {
-			if m.inter == inter && m._type == typ {
-				if m.bad != 0 {
-					m = nil
-					if !canfail {
-						// this can only happen if the conversion
-						// was already done once using the , ok form
-						// and we have a cached negative result.
-						// the cached result doesn't record which
-						// interface function was missing, so jump
-						// down to the interface check, which will
-						// do more work but give a better error.
-						goto search
-					}
-				}
-				if locked != 0 {
-					unlock(&ifaceLock)
-				}
-				return m
-			}
-		}
-	}
-
-	m = (*itab)(persistentalloc(unsafe.Sizeof(itab{})+uintptr(len(inter.mhdr))*ptrSize, 0, &memstats.other_sys))
-	m.inter = inter
-	m._type = typ
-
-search:
-	// both inter and typ have method sorted by name,
-	// and interface names are unique,
-	// so can iterate over both in lock step;
-	// the loop is O(ni+nt) not O(ni*nt).
-	ni := len(inter.mhdr)
-	nt := len(x.mhdr)
-	j := 0
-	for k := 0; k < ni; k++ {
-		i := (*imethod)(add(unsafe.Pointer(inter), unsafe.Sizeof(interfacetype{})+uintptr(k)*unsafe.Sizeof(imethod{})))
-		iname := i.name
-		ipkgpath := i.pkgpath
-		itype := i._type
-		for ; j < nt; j++ {
-			t := (*method)(add(unsafe.Pointer(x), unsafe.Sizeof(uncommontype{})+uintptr(j)*unsafe.Sizeof(method{})))
-			if t.mtyp == itype && t.name == iname && t.pkgpath == ipkgpath {
-				if m != nil {
-					*(*unsafe.Pointer)(add(unsafe.Pointer(m), unsafe.Sizeof(itab{})+uintptr(k)*ptrSize)) = t.ifn
-				}
-				goto nextimethod
-			}
-		}
-		// didn't find method
-		if !canfail {
-			if locked != 0 {
-				unlock(&ifaceLock)
-			}
-			panic(&TypeAssertionError{"", *typ._string, *inter.typ._string, *iname})
-		}
-		m.bad = 1
-		break
-	nextimethod:
-	}
-	if locked == 0 {
-		gothrow("invalid itab locking")
-	}
-	m.link = hash[h]
-	atomicstorep(unsafe.Pointer(&hash[h]), unsafe.Pointer(m))
-	unlock(&ifaceLock)
-	if m.bad != 0 {
-		return nil
-	}
-	return m
-}
-
-func typ2Itab(t *_type, inter *interfacetype, cache **itab) *itab {
-	tab := getitab(inter, t, false)
-	atomicstorep(unsafe.Pointer(cache), unsafe.Pointer(tab))
-	return tab
-}
-
-func convT2E(t *_type, elem unsafe.Pointer) (e interface{}) {
-	size := uintptr(t.size)
-	ep := (*eface)(unsafe.Pointer(&e))
-	if isDirectIface(t) {
-		ep._type = t
-		memmove(unsafe.Pointer(&ep.data), elem, size)
-	} else {
-		x := newobject(t)
-		// TODO: We allocate a zeroed object only to overwrite it with
-		// actual data.  Figure out how to avoid zeroing.  Also below in convT2I.
-		memmove(x, elem, size)
-		ep._type = t
-		ep.data = x
-	}
-	return
-}
-
-func convT2I(t *_type, inter *interfacetype, cache **itab, elem unsafe.Pointer) (i fInterface) {
-	tab := (*itab)(atomicloadp(unsafe.Pointer(cache)))
-	if tab == nil {
-		tab = getitab(inter, t, false)
-		atomicstorep(unsafe.Pointer(cache), unsafe.Pointer(tab))
-	}
-	size := uintptr(t.size)
-	pi := (*iface)(unsafe.Pointer(&i))
-	if isDirectIface(t) {
-		pi.tab = tab
-		memmove(unsafe.Pointer(&pi.data), elem, size)
-	} else {
-		x := newobject(t)
-		memmove(x, elem, size)
-		pi.tab = tab
-		pi.data = x
-	}
-	return
-}
-
-// TODO: give these routines a pointer to the result area instead of writing
-// extra data in the outargs section.  Then we can get rid of go:nosplit.
-//go:nosplit
-func assertI2T(t *_type, i fInterface) (r struct{}) {
-	ip := (*iface)(unsafe.Pointer(&i))
-	tab := ip.tab
-	if tab == nil {
-		panic(&TypeAssertionError{"", "", *t._string, ""})
-	}
-	if tab._type != t {
-		panic(&TypeAssertionError{*tab.inter.typ._string, *tab._type._string, *t._string, ""})
-	}
-	size := uintptr(t.size)
-	if isDirectIface(t) {
-		memmove(unsafe.Pointer(&r), unsafe.Pointer(&ip.data), size)
-	} else {
-		memmove(unsafe.Pointer(&r), ip.data, size)
-	}
-	return
-}
-
-//go:nosplit
-func assertI2T2(t *_type, i fInterface) (r byte) {
-	ip := (*iface)(unsafe.Pointer(&i))
-	size := uintptr(t.size)
-	ok := (*bool)(add(unsafe.Pointer(&r), size))
-	tab := ip.tab
-	if tab == nil || tab._type != t {
-		*ok = false
-		memclr(unsafe.Pointer(&r), size)
-		return
-	}
-	*ok = true
-	if isDirectIface(t) {
-		memmove(unsafe.Pointer(&r), unsafe.Pointer(&ip.data), size)
-	} else {
-		memmove(unsafe.Pointer(&r), ip.data, size)
-	}
-	return
-}
-
-func assertI2TOK(t *_type, i fInterface) bool {
-	ip := (*iface)(unsafe.Pointer(&i))
-	tab := ip.tab
-	return tab != nil && tab._type == t
-}
-
-//go:nosplit
-func assertE2T(t *_type, e interface{}) (r struct{}) {
-	ep := (*eface)(unsafe.Pointer(&e))
-	if ep._type == nil {
-		panic(&TypeAssertionError{"", "", *t._string, ""})
-	}
-	if ep._type != t {
-		panic(&TypeAssertionError{"", *ep._type._string, *t._string, ""})
-	}
-	size := uintptr(t.size)
-	if isDirectIface(t) {
-		memmove(unsafe.Pointer(&r), unsafe.Pointer(&ep.data), size)
-	} else {
-		memmove(unsafe.Pointer(&r), ep.data, size)
-	}
-	return
-}
-
-//go:nosplit
-func assertE2T2(t *_type, e interface{}) (r byte) {
-	ep := (*eface)(unsafe.Pointer(&e))
-	size := uintptr(t.size)
-	ok := (*bool)(add(unsafe.Pointer(&r), size))
-	if ep._type != t {
-		*ok = false
-		memclr(unsafe.Pointer(&r), size)
-		return
-	}
-	*ok = true
-	if isDirectIface(t) {
-		memmove(unsafe.Pointer(&r), unsafe.Pointer(&ep.data), size)
-	} else {
-		memmove(unsafe.Pointer(&r), ep.data, size)
-	}
-	return
-}
-
-func assertE2TOK(t *_type, e interface{}) bool {
-	ep := (*eface)(unsafe.Pointer(&e))
-	return t == ep._type
-}
-
-func convI2E(i fInterface) (r interface{}) {
-	ip := (*iface)(unsafe.Pointer(&i))
-	tab := ip.tab
-	if tab == nil {
-		return
-	}
-	rp := (*eface)(unsafe.Pointer(&r))
-	rp._type = tab._type
-	rp.data = ip.data
-	return
-}
-
-func assertI2E(inter *interfacetype, i fInterface) (r interface{}) {
-	ip := (*iface)(unsafe.Pointer(&i))
-	tab := ip.tab
-	if tab == nil {
-		// explicit conversions require non-nil interface value.
-		panic(&TypeAssertionError{"", "", *inter.typ._string, ""})
-	}
-	rp := (*eface)(unsafe.Pointer(&r))
-	rp._type = tab._type
-	rp.data = ip.data
-	return
-}
-
-func assertI2E2(inter *interfacetype, i fInterface) (r interface{}, ok bool) {
-	ip := (*iface)(unsafe.Pointer(&i))
-	tab := ip.tab
-	if tab == nil {
-		return
-	}
-	rp := (*eface)(unsafe.Pointer(&r))
-	rp._type = tab._type
-	rp.data = ip.data
-	ok = true
-	return
-}
-
-func convI2I(inter *interfacetype, i fInterface) (r fInterface) {
-	ip := (*iface)(unsafe.Pointer(&i))
-	tab := ip.tab
-	if tab == nil {
-		return
-	}
-	rp := (*iface)(unsafe.Pointer(&r))
-	if tab.inter == inter {
-		rp.tab = tab
-		rp.data = ip.data
-		return
-	}
-	rp.tab = getitab(inter, tab._type, false)
-	rp.data = ip.data
-	return
-}
-
-func assertI2I(inter *interfacetype, i fInterface) (r fInterface) {
-	ip := (*iface)(unsafe.Pointer(&i))
-	tab := ip.tab
-	if tab == nil {
-		// explicit conversions require non-nil interface value.
-		panic(&TypeAssertionError{"", "", *inter.typ._string, ""})
-	}
-	rp := (*iface)(unsafe.Pointer(&r))
-	if tab.inter == inter {
-		rp.tab = tab
-		rp.data = ip.data
-		return
-	}
-	rp.tab = getitab(inter, tab._type, false)
-	rp.data = ip.data
-	return
-}
-
-func assertI2I2(inter *interfacetype, i fInterface) (r fInterface, ok bool) {
-	ip := (*iface)(unsafe.Pointer(&i))
-	tab := ip.tab
-	if tab == nil {
-		return
-	}
-	rp := (*iface)(unsafe.Pointer(&r))
-	if tab.inter == inter {
-		rp.tab = tab
-		rp.data = ip.data
-		ok = true
-		return
-	}
-	tab = getitab(inter, tab._type, true)
-	if tab == nil {
-		rp.data = nil
-		rp.tab = nil
-		ok = false
-		return
-	}
-	rp.tab = tab
-	rp.data = ip.data
-	ok = true
-	return
-}
-
-func assertE2I(inter *interfacetype, e interface{}) (r fInterface) {
-	ep := (*eface)(unsafe.Pointer(&e))
-	t := ep._type
-	if t == nil {
-		// explicit conversions require non-nil interface value.
-		panic(&TypeAssertionError{"", "", *inter.typ._string, ""})
-	}
-	rp := (*iface)(unsafe.Pointer(&r))
-	rp.tab = getitab(inter, t, false)
-	rp.data = ep.data
-	return
-}
-
-func assertE2I2(inter *interfacetype, e interface{}) (r fInterface, ok bool) {
-	ep := (*eface)(unsafe.Pointer(&e))
-	t := ep._type
-	if t == nil {
-		return
-	}
-	tab := getitab(inter, t, true)
-	if tab == nil {
-		return
-	}
-	rp := (*iface)(unsafe.Pointer(&r))
-	rp.tab = tab
-	rp.data = ep.data
-	ok = true
-	return
-}
-
-func reflect_ifaceE2I(inter *interfacetype, e interface{}, dst *fInterface) {
-	*dst = assertE2I(inter, e)
-}
-
-func assertE2E(inter *interfacetype, e interface{}) interface{} {
-	ep := (*eface)(unsafe.Pointer(&e))
-	if ep._type == nil {
-		// explicit conversions require non-nil interface value.
-		panic(&TypeAssertionError{"", "", *inter.typ._string, ""})
-	}
-	return e
-}
-
-func assertE2E2(inter *interfacetype, e interface{}) (interface{}, bool) {
-	ep := (*eface)(unsafe.Pointer(&e))
-	if ep._type == nil {
-		return nil, false
-	}
-	return e, true
-}
-
-func ifacethash(i fInterface) uint32 {
-	ip := (*iface)(unsafe.Pointer(&i))
-	tab := ip.tab
-	if tab == nil {
-		return 0
-	}
-	return tab._type.hash
-}
-
-func efacethash(e interface{}) uint32 {
-	ep := (*eface)(unsafe.Pointer(&e))
-	t := ep._type
-	if t == nil {
-		return 0
-	}
-	return t.hash
-}
-
-func iterate_itabs(fn func(*itab)) {
-	for _, h := range &hash {
-		for ; h != nil; h = h.link {
-			fn(h)
-		}
-	}
-}
-
-func ifaceE2I2(inter *interfacetype, e interface{}, r *fInterface) (ok bool) {
-	*r, ok = assertE2I2(inter, e)
-	return
-}