1 // Copyright 2017 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 types 6 7 import ( 8 "cmd/internal/obj" 9 "fmt" 10 ) 11 12 const BADWIDTH = -1000000000 13 14 // Initialized by frontend. Exists only here. 15 var Tptr EType // either TPTR32 or TPTR64 16 17 // The following variables must be initialized early by the frontend. 18 // They are here to break import cycles. 19 // TODO(gri) eliminate these dependencies. 20 var ( 21 Widthptr int 22 Dowidth func(*Type) 23 Fatalf func(string, ...interface{}) 24 Sconv func(*Sym, int, int) string // orig: func sconv(s *Sym, flag FmtFlag, mode fmtMode) string 25 Tconv func(*Type, int, int, int) string // orig: func tconv(t *Type, flag FmtFlag, mode fmtMode, depth int) string 26 FormatSym func(*Sym, fmt.State, rune, int) // orig: func symFormat(sym *Sym, s fmt.State, verb rune, mode fmtMode) 27 FormatType func(*Type, fmt.State, rune, int) // orig: func typeFormat(t *Type, s fmt.State, verb rune, mode fmtMode) 28 TypeLinkSym func(*Type) *obj.LSym 29 Ctxt *obj.Link 30 31 FmtLeft int 32 FmtUnsigned int 33 FErr int 34 ) 35 36 func (s *Sym) String() string { 37 return Sconv(s, 0, FErr) 38 } 39 40 func (sym *Sym) Format(s fmt.State, verb rune) { 41 FormatSym(sym, s, verb, FErr) 42 } 43 44 func (t *Type) String() string { 45 // This is an external entry point, so we pass depth 0 to tconv. 46 // The implementation of tconv (including typefmt and fldconv) 47 // must take care not to use a type in a formatting string 48 // to avoid resetting the recursion counter. 49 return Tconv(t, 0, FErr, 0) 50 } 51 52 // ShortString generates a short description of t. 53 // It is used in autogenerated method names, reflection, 54 // and itab names. 55 func (t *Type) ShortString() string { 56 return Tconv(t, FmtLeft, FErr, 0) 57 } 58 59 // LongString generates a complete description of t. 60 // It is useful for reflection, 61 // or when a unique fingerprint or hash of a type is required. 62 func (t *Type) LongString() string { 63 return Tconv(t, FmtLeft|FmtUnsigned, FErr, 0) 64 } 65 66 func (t *Type) Format(s fmt.State, verb rune) { 67 FormatType(t, s, verb, FErr) 68 } 69 70 type bitset8 uint8 71 72 func (f *bitset8) set(mask uint8, b bool) { 73 if b { 74 *(*uint8)(f) |= mask 75 } else { 76 *(*uint8)(f) &^= mask 77 } 78 } 79
