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utils.go
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utils.go
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// Copyright 2017 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 types
import (
"cmd/internal/obj"
"fmt"
)
const BADWIDTH = -1000000000
// The following variables must be initialized early by the frontend.
// They are here to break import cycles.
// TODO(gri) eliminate these dependencies.
var (
Widthptr int
Dowidth func(*Type)
Fatalf func(string, ...interface{})
Sconv func(*Sym, int, int) string // orig: func sconv(s *Sym, flag FmtFlag, mode fmtMode) string
Tconv func(*Type, int, int, int) string // orig: func tconv(t *Type, flag FmtFlag, mode fmtMode, depth int) string
FormatSym func(*Sym, fmt.State, rune, int) // orig: func symFormat(sym *Sym, s fmt.State, verb rune, mode fmtMode)
FormatType func(*Type, fmt.State, rune, int) // orig: func typeFormat(t *Type, s fmt.State, verb rune, mode fmtMode)
TypeLinkSym func(*Type) *obj.LSym
Ctxt *obj.Link
FmtLeft int
FmtUnsigned int
FErr int
)
func (s *Sym) String() string {
return Sconv(s, 0, FErr)
}
func (sym *Sym) Format(s fmt.State, verb rune) {
FormatSym(sym, s, verb, FErr)
}
func (t *Type) String() string {
// This is an external entry point, so we pass depth 0 to tconv.
// The implementation of tconv (including typefmt and fldconv)
// must take care not to use a type in a formatting string
// to avoid resetting the recursion counter.
return Tconv(t, 0, FErr, 0)
}
// ShortString generates a short description of t.
// It is used in autogenerated method names, reflection,
// and itab names.
func (t *Type) ShortString() string {
return Tconv(t, FmtLeft, FErr, 0)
}
// LongString generates a complete description of t.
// It is useful for reflection,
// or when a unique fingerprint or hash of a type is required.
func (t *Type) LongString() string {
return Tconv(t, FmtLeft|FmtUnsigned, FErr, 0)
}
func (t *Type) Format(s fmt.State, verb rune) {
FormatType(t, s, verb, FErr)
}
type bitset8 uint8
func (f *bitset8) set(mask uint8, b bool) {
if b {
*(*uint8)(f) |= mask
} else {
*(*uint8)(f) &^= mask
}
}