codes.go

     1  // Copyright 2021 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package pkgbits
     6  
     7  // A Code is an enum value that can be encoded into bitstreams.
     8  //
     9  // Code types are preferable for enum types, because they allow
    10  // Decoder to detect desyncs.
    11  type Code interface {
    12  	// Marker returns the SyncMarker for the Code's dynamic type.
    13  	Marker() SyncMarker
    14  
    15  	// Value returns the Code's ordinal value.
    16  	Value() int
    17  }
    18  
    19  // A CodeVal distinguishes among go/constant.Value encodings.
    20  type CodeVal int
    21  
    22  func (c CodeVal) Marker() SyncMarker { return SyncVal }
    23  func (c CodeVal) Value() int         { return int(c) }
    24  
    25  // Note: These values are public and cannot be changed without
    26  // updating the go/types importers.
    27  
    28  const (
    29  	ValBool CodeVal = iota
    30  	ValString
    31  	ValInt64
    32  	ValBigInt
    33  	ValBigRat
    34  	ValBigFloat
    35  )
    36  
    37  // A CodeType distinguishes among go/types.Type encodings.
    38  type CodeType int
    39  
    40  func (c CodeType) Marker() SyncMarker { return SyncType }
    41  func (c CodeType) Value() int         { return int(c) }
    42  
    43  // Note: These values are public and cannot be changed without
    44  // updating the go/types importers.
    45  
    46  const (
    47  	TypeBasic CodeType = iota
    48  	TypeNamed
    49  	TypePointer
    50  	TypeSlice
    51  	TypeArray
    52  	TypeChan
    53  	TypeMap
    54  	TypeSignature
    55  	TypeStruct
    56  	TypeInterface
    57  	TypeUnion
    58  	TypeTypeParam
    59  )
    60  
    61  // A CodeObj distinguishes among go/types.Object encodings.
    62  type CodeObj int
    63  
    64  func (c CodeObj) Marker() SyncMarker { return SyncCodeObj }
    65  func (c CodeObj) Value() int         { return int(c) }
    66  
    67  // Note: These values are public and cannot be changed without
    68  // updating the go/types importers.
    69  
    70  const (
    71  	ObjAlias CodeObj = iota
    72  	ObjConst
    73  	ObjType
    74  	ObjFunc
    75  	ObjVar
    76  	ObjStub
    77  )
    78
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