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// Copyright 2012 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 reflect
import "unsafe"
// MakeRO returns a copy of v with the read-only flag set.
func MakeRO(v Value) Value {
v.flag |= flagStickyRO
return v
}
// IsRO reports whether v's read-only flag is set.
func IsRO(v Value) bool {
return v.flag&flagStickyRO != 0
}
var CallGC = &callGC
const PtrSize = ptrSize
func FuncLayout(t Type, rcvr Type) (frametype Type, argSize, retOffset uintptr, stack []byte, gc []byte, ptrs bool) {
var ft *rtype
var s *bitVector
if rcvr != nil {
ft, argSize, retOffset, s, _ = funcLayout(t.(*rtype), rcvr.(*rtype))
} else {
ft, argSize, retOffset, s, _ = funcLayout(t.(*rtype), nil)
}
frametype = ft
for i := uint32(0); i < s.n; i++ {
stack = append(stack, s.data[i/8]>>(i%8)&1)
}
if ft.kind&kindGCProg != 0 {
panic("can't handle gc programs")
}
gcdata := (*[1000]byte)(unsafe.Pointer(ft.gcdata))
for i := uintptr(0); i < ft.ptrdata/ptrSize; i++ {
gc = append(gc, gcdata[i/8]>>(i%8)&1)
}
ptrs = ft.kind&kindNoPointers == 0
return
}
func TypeLinks() []string {
var r []string
for _, m := range typelinks() {
for _, t := range m {
r = append(r, t.string)
}
}
return r
}
var GCBits = gcbits
func gcbits(interface{}) []byte // provided by runtime
func MapBucketOf(x, y Type) Type {
return bucketOf(x.(*rtype), y.(*rtype))
}
func CachedBucketOf(m Type) Type {
t := m.(*rtype)
if Kind(t.kind&kindMask) != Map {
panic("not map")
}
tt := (*mapType)(unsafe.Pointer(t))
return tt.bucket
}
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