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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 (
"internal/goarch"
"sync"
"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
// FuncLayout calls funcLayout and returns a subset of the results for testing.
//
// Bitmaps like stack, gc, inReg, and outReg are expanded such that each bit
// takes up one byte, so that writing out test cases is a little clearer.
// If ptrs is false, gc will be nil.
func FuncLayout(t Type, rcvr Type) (frametype Type, argSize, retOffset uintptr, stack, gc, inReg, outReg []byte, ptrs bool) {
var ft *rtype
var abid abiDesc
if rcvr != nil {
ft, _, abid = funcLayout((*funcType)(unsafe.Pointer(t.(*rtype))), rcvr.(*rtype))
} else {
ft, _, abid = funcLayout((*funcType)(unsafe.Pointer(t.(*rtype))), nil)
}
// Extract size information.
argSize = abid.stackCallArgsSize
retOffset = abid.retOffset
frametype = ft
// Expand stack pointer bitmap into byte-map.
for i := uint32(0); i < abid.stackPtrs.n; i++ {
stack = append(stack, abid.stackPtrs.data[i/8]>>(i%8)&1)
}
// Expand register pointer bitmaps into byte-maps.
bool2byte := func(b bool) byte {
if b {
return 1
}
return 0
}
for i := 0; i < intArgRegs; i++ {
inReg = append(inReg, bool2byte(abid.inRegPtrs.Get(i)))
outReg = append(outReg, bool2byte(abid.outRegPtrs.Get(i)))
}
if ft.kind&kindGCProg != 0 {
panic("can't handle gc programs")
}
// Expand frame type's GC bitmap into byte-map.
ptrs = ft.ptrdata != 0
if ptrs {
nptrs := ft.ptrdata / goarch.PtrSize
gcdata := ft.gcSlice(0, (nptrs+7)/8)
for i := uintptr(0); i < nptrs; i++ {
gc = append(gc, gcdata[i/8]>>(i%8)&1)
}
}
return
}
func TypeLinks() []string {
var r []string
sections, offset := typelinks()
for i, offs := range offset {
rodata := sections[i]
for _, off := range offs {
typ := (*rtype)(resolveTypeOff(unsafe.Pointer(rodata), off))
r = append(r, typ.String())
}
}
return r
}
var GCBits = gcbits
func gcbits(any) []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
}
type EmbedWithUnexpMeth struct{}
func (EmbedWithUnexpMeth) f() {}
type pinUnexpMeth interface {
f()
}
var pinUnexpMethI = pinUnexpMeth(EmbedWithUnexpMeth{})
func FirstMethodNameBytes(t Type) *byte {
_ = pinUnexpMethI
ut := t.uncommon()
if ut == nil {
panic("type has no methods")
}
m := ut.methods()[0]
mname := t.(*rtype).nameOff(m.name)
if *mname.data(0, "name flag field")&(1<<2) == 0 {
panic("method name does not have pkgPath *string")
}
return mname.bytes
}
type OtherPkgFields struct {
OtherExported int
otherUnexported int
}
func IsExported(t Type) bool {
typ := t.(*rtype)
n := typ.nameOff(typ.str)
return n.isExported()
}
func ResolveReflectName(s string) {
resolveReflectName(newName(s, "", false))
}
type Buffer struct {
buf []byte
}
func clearLayoutCache() {
layoutCache = sync.Map{}
}
func SetArgRegs(ints, floats int, floatSize uintptr) (oldInts, oldFloats int, oldFloatSize uintptr) {
oldInts = intArgRegs
oldFloats = floatArgRegs
oldFloatSize = floatRegSize
intArgRegs = ints
floatArgRegs = floats
floatRegSize = floatSize
clearLayoutCache()
return
}
var MethodValueCallCodePtr = methodValueCallCodePtr
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