Source file src/pkg/cmd/compile/internal/types/utils.go

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

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