// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package reflect
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import "unsafe"
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// MakeRO returns a copy of v with the read-only flag set.
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func MakeRO(v Value) Value {
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v.flag |= flagStickyRO
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return v
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}
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// IsRO reports whether v's read-only flag is set.
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func IsRO(v Value) bool {
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return v.flag&flagStickyRO != 0
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}
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var CallGC = &callGC
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const PtrSize = ptrSize
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func FuncLayout(t Type, rcvr Type) (frametype Type, argSize, retOffset uintptr, stack []byte, gc []byte, ptrs bool) {
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var ft *rtype
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var s *bitVector
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if rcvr != nil {
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ft, argSize, retOffset, s, _ = funcLayout((*funcType)(unsafe.Pointer(t.(*rtype))), rcvr.(*rtype))
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} else {
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ft, argSize, retOffset, s, _ = funcLayout((*funcType)(unsafe.Pointer(t.(*rtype))), nil)
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}
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frametype = ft
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for i := uint32(0); i < s.n; i++ {
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stack = append(stack, s.data[i/8]>>(i%8)&1)
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}
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if ft.kind&kindGCProg != 0 {
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panic("can't handle gc programs")
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}
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gcdata := (*[1000]byte)(unsafe.Pointer(ft.gcdata))
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for i := uintptr(0); i < ft.ptrdata/ptrSize; i++ {
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gc = append(gc, gcdata[i/8]>>(i%8)&1)
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}
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ptrs = ft.kind&kindNoPointers == 0
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return
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}
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func TypeLinks() []string {
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var r []string
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sections, offset := typelinks()
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for i, offs := range offset {
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rodata := sections[i]
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for _, off := range offs {
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typ := (*rtype)(resolveTypeOff(unsafe.Pointer(rodata), off))
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r = append(r, typ.String())
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}
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}
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return r
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}
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var GCBits = gcbits
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func gcbits(interface{}) []byte // provided by runtime
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func MapBucketOf(x, y Type) Type {
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return bucketOf(x.(*rtype), y.(*rtype))
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}
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func CachedBucketOf(m Type) Type {
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t := m.(*rtype)
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if Kind(t.kind&kindMask) != Map {
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panic("not map")
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}
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tt := (*mapType)(unsafe.Pointer(t))
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return tt.bucket
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}
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type EmbedWithUnexpMeth struct{}
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func (EmbedWithUnexpMeth) f() {}
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type pinUnexpMeth interface {
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f()
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}
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var pinUnexpMethI = pinUnexpMeth(EmbedWithUnexpMeth{})
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func FirstMethodNameBytes(t Type) *byte {
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_ = pinUnexpMethI
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ut := t.uncommon()
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if ut == nil {
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panic("type has no methods")
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}
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m := ut.methods()[0]
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mname := t.(*rtype).nameOff(m.name)
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if *mname.data(0, "name flag field")&(1<<2) == 0 {
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panic("method name does not have pkgPath *string")
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}
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return mname.bytes
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}
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type OtherPkgFields struct {
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OtherExported int
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otherUnexported int
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}
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func IsExported(t Type) bool {
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typ := t.(*rtype)
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n := typ.nameOff(typ.str)
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return n.isExported()
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}
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func ResolveReflectName(s string) {
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resolveReflectName(newName(s, "", false))
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}
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type Buffer struct {
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buf []byte
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}
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