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51 lines
1.7 KiB
Go
51 lines
1.7 KiB
Go
// Copyright 2009 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-go file.
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package deepequal
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import "unsafe"
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type value struct {
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// typ holds the type of the value represented by a Value.
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typ *rtype
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// Pointer-valued data or, if flagIndir is set, pointer to data.
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// Valid when either flagIndir is set or typ.pointers() is true.
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ptr unsafe.Pointer
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// flag holds metadata about the value.
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// The lowest bits are flag bits:
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// - flagStickyRO: obtained via unexported not embedded field, so read-only
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// - flagEmbedRO: obtained via unexported embedded field, so read-only
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// - flagIndir: val holds a pointer to the data
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// - flagAddr: v.CanAddr is true (implies flagIndir)
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// - flagMethod: v is a method value.
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// The next five bits give the Kind of the value.
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// This repeats typ.Kind() except for method values.
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// The remaining 23+ bits give a method number for method values.
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// If flag.kind() != Func, code can assume that flagMethod is unset.
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// If ifaceIndir(typ), code can assume that flagIndir is set.
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flag
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// A method value represents a curried method invocation
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// like r.Read for some receiver r. The typ+val+flag bits describe
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// the receiver r, but the flag's Kind bits say Func (methods are
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// functions), and the top bits of the flag give the method number
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// in r's type's method table.
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}
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type flag uintptr
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const (
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flagKindWidth = 5 // there are 27 kinds
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flagKindMask flag = 1<<flagKindWidth - 1
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flagStickyRO flag = 1 << 5
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flagEmbedRO flag = 1 << 6
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flagIndir flag = 1 << 7
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flagAddr flag = 1 << 8
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flagMethod flag = 1 << 9
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flagMethodShift = 10
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flagRO flag = flagStickyRO | flagEmbedRO
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)
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