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fmt.go
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fmt.go
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// Copyright 2011 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 gc
import (
"bytes"
"cmd/compile/internal/types"
"cmd/internal/src"
"fmt"
"io"
"strconv"
"strings"
"sync"
"unicode/utf8"
)
// A FmtFlag value is a set of flags (or 0).
// They control how the Xconv functions format their values.
// See the respective function's documentation for details.
type FmtFlag int
const ( // fmt.Format flag/prec or verb
FmtLeft FmtFlag = 1 << iota // '-'
FmtSharp // '#'
FmtSign // '+'
FmtUnsigned // internal use only (historic: u flag)
FmtShort // verb == 'S' (historic: h flag)
FmtLong // verb == 'L' (historic: l flag)
FmtComma // '.' (== hasPrec) (historic: , flag)
FmtByte // '0' (historic: hh flag)
)
// fmtFlag computes the (internal) FmtFlag
// value given the fmt.State and format verb.
func fmtFlag(s fmt.State, verb rune) FmtFlag {
var flag FmtFlag
if s.Flag('-') {
flag |= FmtLeft
}
if s.Flag('#') {
flag |= FmtSharp
}
if s.Flag('+') {
flag |= FmtSign
}
if s.Flag(' ') {
Fatalf("FmtUnsigned in format string")
}
if _, ok := s.Precision(); ok {
flag |= FmtComma
}
if s.Flag('0') {
flag |= FmtByte
}
switch verb {
case 'S':
flag |= FmtShort
case 'L':
flag |= FmtLong
}
return flag
}
// Format conversions:
// TODO(gri) verify these; eliminate those not used anymore
//
// %v Op Node opcodes
// Flags: #: print Go syntax (automatic unless mode == FDbg)
//
// %j *Node Node details
// Flags: 0: suppresses things not relevant until walk
//
// %v *Val Constant values
//
// %v *types.Sym Symbols
// %S unqualified identifier in any mode
// Flags: +,- #: mode (see below)
// 0: in export mode: unqualified identifier if exported, qualified if not
//
// %v *types.Type Types
// %S omit "func" and receiver in function types
// %L definition instead of name.
// Flags: +,- #: mode (see below)
// ' ' (only in -/Sym mode) print type identifiers wit package name instead of prefix.
//
// %v *Node Nodes
// %S (only in +/debug mode) suppress recursion
// %L (only in Error mode) print "foo (type Bar)"
// Flags: +,- #: mode (see below)
//
// %v Nodes Node lists
// Flags: those of *Node
// .: separate items with ',' instead of ';'
// *types.Sym, *types.Type, and *Node types use the flags below to set the format mode
const (
FErr fmtMode = iota
FDbg
FTypeId
FTypeIdName // same as FTypeId, but use package name instead of prefix
)
// The mode flags '+', '-', and '#' are sticky; they persist through
// recursions of *Node, *types.Type, and *types.Sym values. The ' ' flag is
// sticky only on *types.Type recursions and only used in %-/*types.Sym mode.
//
// Example: given a *types.Sym: %+v %#v %-v print an identifier properly qualified for debug/export/internal mode
// Useful format combinations:
// TODO(gri): verify these
//
// *Node, Nodes:
// %+v multiline recursive debug dump of *Node/Nodes
// %+S non-recursive debug dump
//
// *Node:
// %#v Go format
// %L "foo (type Bar)" for error messages
//
// *types.Type:
// %#v Go format
// %#L type definition instead of name
// %#S omit "func" and receiver in function signature
//
// %-v type identifiers
// %-S type identifiers without "func" and arg names in type signatures (methodsym)
// %- v type identifiers with package name instead of prefix (typesym, dcommontype, typehash)
// update returns the results of applying f to mode.
func (f FmtFlag) update(mode fmtMode) (FmtFlag, fmtMode) {
switch {
case f&FmtSign != 0:
mode = FDbg
case f&FmtSharp != 0:
// ignore (textual export format no longer supported)
case f&FmtUnsigned != 0:
mode = FTypeIdName
case f&FmtLeft != 0:
mode = FTypeId
}
f &^= FmtSharp | FmtLeft | FmtSign
return f, mode
}
var goopnames = []string{
OADDR: "&",
OADD: "+",
OADDSTR: "+",
OALIGNOF: "unsafe.Alignof",
OANDAND: "&&",
OANDNOT: "&^",
OAND: "&",
OAPPEND: "append",
OAS: "=",
OAS2: "=",
OBREAK: "break",
OCALL: "function call", // not actual syntax
OCAP: "cap",
OCASE: "case",
OCLOSE: "close",
OCOMPLEX: "complex",
OBITNOT: "^",
OCONTINUE: "continue",
OCOPY: "copy",
ODELETE: "delete",
ODEFER: "defer",
ODIV: "/",
OEQ: "==",
OFALL: "fallthrough",
OFOR: "for",
OFORUNTIL: "foruntil", // not actual syntax; used to avoid off-end pointer live on backedge.892
OGE: ">=",
OGOTO: "goto",
OGT: ">",
OIF: "if",
OIMAG: "imag",
OINLMARK: "inlmark",
ODEREF: "*",
OLEN: "len",
OLE: "<=",
OLSH: "<<",
OLT: "<",
OMAKE: "make",
ONEG: "-",
OMOD: "%",
OMUL: "*",
ONEW: "new",
ONE: "!=",
ONOT: "!",
OOFFSETOF: "unsafe.Offsetof",
OOROR: "||",
OOR: "|",
OPANIC: "panic",
OPLUS: "+",
OPRINTN: "println",
OPRINT: "print",
ORANGE: "range",
OREAL: "real",
ORECV: "<-",
ORECOVER: "recover",
ORETURN: "return",
ORSH: ">>",
OSELECT: "select",
OSEND: "<-",
OSIZEOF: "unsafe.Sizeof",
OSUB: "-",
OSWITCH: "switch",
OXOR: "^",
}
func (o Op) GoString() string {
return fmt.Sprintf("%#v", o)
}
func (o Op) format(s fmt.State, verb rune, mode fmtMode) {
switch verb {
case 'v':
o.oconv(s, fmtFlag(s, verb), mode)
default:
fmt.Fprintf(s, "%%!%c(Op=%d)", verb, int(o))
}
}
func (o Op) oconv(s fmt.State, flag FmtFlag, mode fmtMode) {
if flag&FmtSharp != 0 || mode != FDbg {
if int(o) < len(goopnames) && goopnames[o] != "" {
fmt.Fprint(s, goopnames[o])
return
}
}
// 'o.String()' instead of just 'o' to avoid infinite recursion
fmt.Fprint(s, o.String())
}
type (
fmtMode int
fmtNodeErr Node
fmtNodeDbg Node
fmtNodeTypeId Node
fmtNodeTypeIdName Node
fmtOpErr Op
fmtOpDbg Op
fmtOpTypeId Op
fmtOpTypeIdName Op
fmtTypeErr types.Type
fmtTypeDbg types.Type
fmtTypeTypeId types.Type
fmtTypeTypeIdName types.Type
fmtSymErr types.Sym
fmtSymDbg types.Sym
fmtSymTypeId types.Sym
fmtSymTypeIdName types.Sym
fmtNodesErr Nodes
fmtNodesDbg Nodes
fmtNodesTypeId Nodes
fmtNodesTypeIdName Nodes
)
func (n *fmtNodeErr) Format(s fmt.State, verb rune) { (*Node)(n).format(s, verb, FErr) }
func (n *fmtNodeDbg) Format(s fmt.State, verb rune) { (*Node)(n).format(s, verb, FDbg) }
func (n *fmtNodeTypeId) Format(s fmt.State, verb rune) { (*Node)(n).format(s, verb, FTypeId) }
func (n *fmtNodeTypeIdName) Format(s fmt.State, verb rune) { (*Node)(n).format(s, verb, FTypeIdName) }
func (n *Node) Format(s fmt.State, verb rune) { n.format(s, verb, FErr) }
func (o fmtOpErr) Format(s fmt.State, verb rune) { Op(o).format(s, verb, FErr) }
func (o fmtOpDbg) Format(s fmt.State, verb rune) { Op(o).format(s, verb, FDbg) }
func (o fmtOpTypeId) Format(s fmt.State, verb rune) { Op(o).format(s, verb, FTypeId) }
func (o fmtOpTypeIdName) Format(s fmt.State, verb rune) { Op(o).format(s, verb, FTypeIdName) }
func (o Op) Format(s fmt.State, verb rune) { o.format(s, verb, FErr) }
func (t *fmtTypeErr) Format(s fmt.State, verb rune) { typeFormat((*types.Type)(t), s, verb, FErr) }
func (t *fmtTypeDbg) Format(s fmt.State, verb rune) { typeFormat((*types.Type)(t), s, verb, FDbg) }
func (t *fmtTypeTypeId) Format(s fmt.State, verb rune) {
typeFormat((*types.Type)(t), s, verb, FTypeId)
}
func (t *fmtTypeTypeIdName) Format(s fmt.State, verb rune) {
typeFormat((*types.Type)(t), s, verb, FTypeIdName)
}
// func (t *types.Type) Format(s fmt.State, verb rune) // in package types
func (y *fmtSymErr) Format(s fmt.State, verb rune) { symFormat((*types.Sym)(y), s, verb, FErr) }
func (y *fmtSymDbg) Format(s fmt.State, verb rune) { symFormat((*types.Sym)(y), s, verb, FDbg) }
func (y *fmtSymTypeId) Format(s fmt.State, verb rune) { symFormat((*types.Sym)(y), s, verb, FTypeId) }
func (y *fmtSymTypeIdName) Format(s fmt.State, verb rune) {
symFormat((*types.Sym)(y), s, verb, FTypeIdName)
}
// func (y *types.Sym) Format(s fmt.State, verb rune) // in package types { y.format(s, verb, FErr) }
func (n fmtNodesErr) Format(s fmt.State, verb rune) { (Nodes)(n).format(s, verb, FErr) }
func (n fmtNodesDbg) Format(s fmt.State, verb rune) { (Nodes)(n).format(s, verb, FDbg) }
func (n fmtNodesTypeId) Format(s fmt.State, verb rune) { (Nodes)(n).format(s, verb, FTypeId) }
func (n fmtNodesTypeIdName) Format(s fmt.State, verb rune) { (Nodes)(n).format(s, verb, FTypeIdName) }
func (n Nodes) Format(s fmt.State, verb rune) { n.format(s, verb, FErr) }
func (m fmtMode) Fprintf(s fmt.State, format string, args ...interface{}) {
m.prepareArgs(args)
fmt.Fprintf(s, format, args...)
}
func (m fmtMode) Sprintf(format string, args ...interface{}) string {
m.prepareArgs(args)
return fmt.Sprintf(format, args...)
}
func (m fmtMode) Sprint(args ...interface{}) string {
m.prepareArgs(args)
return fmt.Sprint(args...)
}
func (m fmtMode) prepareArgs(args []interface{}) {
switch m {
case FErr:
for i, arg := range args {
switch arg := arg.(type) {
case Op:
args[i] = fmtOpErr(arg)
case *Node:
args[i] = (*fmtNodeErr)(arg)
case *types.Type:
args[i] = (*fmtTypeErr)(arg)
case *types.Sym:
args[i] = (*fmtSymErr)(arg)
case Nodes:
args[i] = fmtNodesErr(arg)
case Val, int32, int64, string, types.EType:
// OK: printing these types doesn't depend on mode
default:
Fatalf("mode.prepareArgs type %T", arg)
}
}
case FDbg:
for i, arg := range args {
switch arg := arg.(type) {
case Op:
args[i] = fmtOpDbg(arg)
case *Node:
args[i] = (*fmtNodeDbg)(arg)
case *types.Type:
args[i] = (*fmtTypeDbg)(arg)
case *types.Sym:
args[i] = (*fmtSymDbg)(arg)
case Nodes:
args[i] = fmtNodesDbg(arg)
case Val, int32, int64, string, types.EType:
// OK: printing these types doesn't depend on mode
default:
Fatalf("mode.prepareArgs type %T", arg)
}
}
case FTypeId:
for i, arg := range args {
switch arg := arg.(type) {
case Op:
args[i] = fmtOpTypeId(arg)
case *Node:
args[i] = (*fmtNodeTypeId)(arg)
case *types.Type:
args[i] = (*fmtTypeTypeId)(arg)
case *types.Sym:
args[i] = (*fmtSymTypeId)(arg)
case Nodes:
args[i] = fmtNodesTypeId(arg)
case Val, int32, int64, string, types.EType:
// OK: printing these types doesn't depend on mode
default:
Fatalf("mode.prepareArgs type %T", arg)
}
}
case FTypeIdName:
for i, arg := range args {
switch arg := arg.(type) {
case Op:
args[i] = fmtOpTypeIdName(arg)
case *Node:
args[i] = (*fmtNodeTypeIdName)(arg)
case *types.Type:
args[i] = (*fmtTypeTypeIdName)(arg)
case *types.Sym:
args[i] = (*fmtSymTypeIdName)(arg)
case Nodes:
args[i] = fmtNodesTypeIdName(arg)
case Val, int32, int64, string, types.EType:
// OK: printing these types doesn't depend on mode
default:
Fatalf("mode.prepareArgs type %T", arg)
}
}
default:
Fatalf("mode.prepareArgs mode %d", m)
}
}
func (n *Node) format(s fmt.State, verb rune, mode fmtMode) {
switch verb {
case 'v', 'S', 'L':
n.nconv(s, fmtFlag(s, verb), mode)
case 'j':
n.jconv(s, fmtFlag(s, verb))
default:
fmt.Fprintf(s, "%%!%c(*Node=%p)", verb, n)
}
}
// *Node details
func (n *Node) jconv(s fmt.State, flag FmtFlag) {
c := flag & FmtShort
if c == 0 && n.Name != nil && n.Name.Vargen != 0 {
fmt.Fprintf(s, " g(%d)", n.Name.Vargen)
}
if n.Pos.IsKnown() {
pfx := ""
switch n.Pos.IsStmt() {
case src.PosNotStmt:
pfx = "_" // "-" would be confusing
case src.PosIsStmt:
pfx = "+"
}
fmt.Fprintf(s, " l(%s%d)", pfx, n.Pos.Line())
}
if c == 0 && n.Xoffset != BADWIDTH {
fmt.Fprintf(s, " x(%d)", n.Xoffset)
}
if n.Class() != 0 {
fmt.Fprintf(s, " class(%v)", n.Class())
}
if n.Colas() {
fmt.Fprintf(s, " colas(%v)", n.Colas())
}
switch n.Esc {
case EscUnknown:
break
case EscHeap:
fmt.Fprint(s, " esc(h)")
case EscNone:
fmt.Fprint(s, " esc(no)")
case EscNever:
if c == 0 {
fmt.Fprint(s, " esc(N)")
}
default:
fmt.Fprintf(s, " esc(%d)", n.Esc)
}
if e, ok := n.Opt().(*EscLocation); ok && e.loopDepth != 0 {
fmt.Fprintf(s, " ld(%d)", e.loopDepth)
}
if c == 0 && n.Typecheck() != 0 {
fmt.Fprintf(s, " tc(%d)", n.Typecheck())
}
if n.IsDDD() {
fmt.Fprintf(s, " isddd(%v)", n.IsDDD())
}
if n.Implicit() {
fmt.Fprintf(s, " implicit(%v)", n.Implicit())
}
if n.Embedded() {
fmt.Fprintf(s, " embedded")
}
if n.Op == ONAME {
if n.Name.Addrtaken() {
fmt.Fprint(s, " addrtaken")
}
if n.Name.Assigned() {
fmt.Fprint(s, " assigned")
}
}
if n.Bounded() {
fmt.Fprint(s, " bounded")
}
if n.NonNil() {
fmt.Fprint(s, " nonnil")
}
if c == 0 && n.HasCall() {
fmt.Fprint(s, " hascall")
}
if c == 0 && n.Name != nil && n.Name.Used() {
fmt.Fprint(s, " used")
}
}
func (v Val) Format(s fmt.State, verb rune) {
switch verb {
case 'v':
v.vconv(s, fmtFlag(s, verb))
default:
fmt.Fprintf(s, "%%!%c(Val=%T)", verb, v)
}
}
func (v Val) vconv(s fmt.State, flag FmtFlag) {
switch u := v.U.(type) {
case *Mpint:
if !u.Rune {
if flag&FmtSharp != 0 {
fmt.Fprint(s, u.String())
return
}
fmt.Fprint(s, u.GoString())
return
}
switch x := u.Int64(); {
case ' ' <= x && x < utf8.RuneSelf && x != '\\' && x != '\'':
fmt.Fprintf(s, "'%c'", int(x))
case 0 <= x && x < 1<<16:
fmt.Fprintf(s, "'\\u%04x'", uint(int(x)))
case 0 <= x && x <= utf8.MaxRune:
fmt.Fprintf(s, "'\\U%08x'", uint64(x))
default:
fmt.Fprintf(s, "('\\x00' + %v)", u)
}
case *Mpflt:
if flag&FmtSharp != 0 {
fmt.Fprint(s, u.String())
return
}
fmt.Fprint(s, u.GoString())
return
case *Mpcplx:
if flag&FmtSharp != 0 {
fmt.Fprint(s, u.String())
return
}
fmt.Fprint(s, u.GoString())
return
case string:
fmt.Fprint(s, strconv.Quote(u))
case bool:
fmt.Fprint(s, u)
case *NilVal:
fmt.Fprint(s, "nil")
default:
fmt.Fprintf(s, "<ctype=%d>", v.Ctype())
}
}
/*
s%,%,\n%g
s%\n+%\n%g
s%^[ ]*T%%g
s%,.*%%g
s%.+% [T&] = "&",%g
s%^ ........*\]%&~%g
s%~ %%g
*/
func symfmt(b *bytes.Buffer, s *types.Sym, flag FmtFlag, mode fmtMode) {
if flag&FmtShort == 0 {
switch mode {
case FErr: // This is for the user
if s.Pkg == builtinpkg || s.Pkg == localpkg {
b.WriteString(s.Name)
return
}
// If the name was used by multiple packages, display the full path,
if s.Pkg.Name != "" && numImport[s.Pkg.Name] > 1 {
fmt.Fprintf(b, "%q.%s", s.Pkg.Path, s.Name)
return
}
b.WriteString(s.Pkg.Name)
b.WriteByte('.')
b.WriteString(s.Name)
return
case FDbg:
b.WriteString(s.Pkg.Name)
b.WriteByte('.')
b.WriteString(s.Name)
return
case FTypeIdName:
// dcommontype, typehash
b.WriteString(s.Pkg.Name)
b.WriteByte('.')
b.WriteString(s.Name)
return
case FTypeId:
// (methodsym), typesym, weaksym
b.WriteString(s.Pkg.Prefix)
b.WriteByte('.')
b.WriteString(s.Name)
return
}
}
if flag&FmtByte != 0 {
// FmtByte (hh) implies FmtShort (h)
// skip leading "type." in method name
name := s.Name
if i := strings.LastIndex(name, "."); i >= 0 {
name = name[i+1:]
}
if mode == FDbg {
fmt.Fprintf(b, "@%q.%s", s.Pkg.Path, name)
return
}
b.WriteString(name)
return
}
b.WriteString(s.Name)
}
var basicnames = []string{
TINT: "int",
TUINT: "uint",
TINT8: "int8",
TUINT8: "uint8",
TINT16: "int16",
TUINT16: "uint16",
TINT32: "int32",
TUINT32: "uint32",
TINT64: "int64",
TUINT64: "uint64",
TUINTPTR: "uintptr",
TFLOAT32: "float32",
TFLOAT64: "float64",
TCOMPLEX64: "complex64",
TCOMPLEX128: "complex128",
TBOOL: "bool",
TANY: "any",
TSTRING: "string",
TNIL: "nil",
TIDEAL: "untyped number",
TBLANK: "blank",
}
var fmtBufferPool = sync.Pool{
New: func() interface{} {
return new(bytes.Buffer)
},
}
func tconv(t *types.Type, flag FmtFlag, mode fmtMode) string {
buf := fmtBufferPool.Get().(*bytes.Buffer)
buf.Reset()
defer fmtBufferPool.Put(buf)
tconv2(buf, t, flag, mode, nil)
return types.InternString(buf.Bytes())
}
// tconv2 writes a string representation of t to b.
// flag and mode control exactly what is printed.
// Any types x that are already in the visited map get printed as @%d where %d=visited[x].
// See #16897 before changing the implementation of tconv.
func tconv2(b *bytes.Buffer, t *types.Type, flag FmtFlag, mode fmtMode, visited map[*types.Type]int) {
if off, ok := visited[t]; ok {
// We've seen this type before, so we're trying to print it recursively.
// Print a reference to it instead.
fmt.Fprintf(b, "@%d", off)
return
}
if t == nil {
b.WriteString("<T>")
return
}
if t.Etype == types.TSSA {
b.WriteString(t.Extra.(string))
return
}
if t.Etype == types.TTUPLE {
b.WriteString(t.FieldType(0).String())
b.WriteByte(',')
b.WriteString(t.FieldType(1).String())
return
}
if t.Etype == types.TRESULTS {
tys := t.Extra.(*types.Results).Types
for i, et := range tys {
if i > 0 {
b.WriteByte(',')
}
b.WriteString(et.String())
}
return
}
flag, mode = flag.update(mode)
if mode == FTypeIdName {
flag |= FmtUnsigned
}
if t == types.Bytetype || t == types.Runetype {
// in %-T mode collapse rune and byte with their originals.
switch mode {
case FTypeIdName, FTypeId:
t = types.Types[t.Etype]
default:
sconv2(b, t.Sym, FmtShort, mode)
return
}
}
if t == types.Errortype {
b.WriteString("error")
return
}
// Unless the 'L' flag was specified, if the type has a name, just print that name.
if flag&FmtLong == 0 && t.Sym != nil && t != types.Types[t.Etype] {
switch mode {
case FTypeId, FTypeIdName:
if flag&FmtShort != 0 {
if t.Vargen != 0 {
sconv2(b, t.Sym, FmtShort, mode)
fmt.Fprintf(b, "·%d", t.Vargen)
return
}
sconv2(b, t.Sym, FmtShort, mode)
return
}
if mode == FTypeIdName {
sconv2(b, t.Sym, FmtUnsigned, mode)
return
}
if t.Sym.Pkg == localpkg && t.Vargen != 0 {
b.WriteString(mode.Sprintf("%v·%d", t.Sym, t.Vargen))
return
}
}
sconv2(b, t.Sym, 0, mode)
return
}
if int(t.Etype) < len(basicnames) && basicnames[t.Etype] != "" {
var name string
switch t {
case types.UntypedBool:
name = "untyped bool"
case types.UntypedString:
name = "untyped string"
case types.UntypedInt:
name = "untyped int"
case types.UntypedRune:
name = "untyped rune"
case types.UntypedFloat:
name = "untyped float"
case types.UntypedComplex:
name = "untyped complex"
default:
name = basicnames[t.Etype]
}
b.WriteString(name)
return
}
// At this point, we might call tconv2 recursively. Add the current type to the visited list so we don't
// try to print it recursively.
// We record the offset in the result buffer where the type's text starts. This offset serves as a reference
// point for any later references to the same type.
// Note that we remove the type from the visited map as soon as the recursive call is done.
// This prevents encoding types like map[*int]*int as map[*int]@4. (That encoding would work,
// but I'd like to use the @ notation only when strictly necessary.)
if visited == nil {
visited = map[*types.Type]int{}
}
visited[t] = b.Len()
defer delete(visited, t)
if mode == FDbg {
b.WriteString(t.Etype.String())
b.WriteByte('-')
tconv2(b, t, flag, FErr, visited)
return
}
switch t.Etype {
case TPTR:
b.WriteByte('*')
switch mode {
case FTypeId, FTypeIdName:
if flag&FmtShort != 0 {
tconv2(b, t.Elem(), FmtShort, mode, visited)
return
}
}
tconv2(b, t.Elem(), 0, mode, visited)
case TARRAY:
b.WriteByte('[')
b.WriteString(strconv.FormatInt(t.NumElem(), 10))
b.WriteByte(']')
tconv2(b, t.Elem(), 0, mode, visited)
case TSLICE:
b.WriteString("[]")
tconv2(b, t.Elem(), 0, mode, visited)
case TCHAN:
switch t.ChanDir() {
case types.Crecv:
b.WriteString("<-chan ")
tconv2(b, t.Elem(), 0, mode, visited)
case types.Csend:
b.WriteString("chan<- ")
tconv2(b, t.Elem(), 0, mode, visited)
default:
b.WriteString("chan ")
if t.Elem() != nil && t.Elem().IsChan() && t.Elem().Sym == nil && t.Elem().ChanDir() == types.Crecv {
b.WriteByte('(')
tconv2(b, t.Elem(), 0, mode, visited)
b.WriteByte(')')
} else {
tconv2(b, t.Elem(), 0, mode, visited)
}
}
case TMAP:
b.WriteString("map[")
tconv2(b, t.Key(), 0, mode, visited)
b.WriteByte(']')
tconv2(b, t.Elem(), 0, mode, visited)
case TINTER:
if t.IsEmptyInterface() {
b.WriteString("interface {}")
break
}
b.WriteString("interface {")
for i, f := range t.Fields().Slice() {
if i != 0 {
b.WriteByte(';')
}
b.WriteByte(' ')
switch {
case f.Sym == nil:
// Check first that a symbol is defined for this type.
// Wrong interface definitions may have types lacking a symbol.
break
case types.IsExported(f.Sym.Name):
sconv2(b, f.Sym, FmtShort, mode)
default:
flag1 := FmtLeft
if flag&FmtUnsigned != 0 {
flag1 = FmtUnsigned
}
sconv2(b, f.Sym, flag1, mode)
}
tconv2(b, f.Type, FmtShort, mode, visited)
}
if t.NumFields() != 0 {
b.WriteByte(' ')
}
b.WriteByte('}')
case TFUNC:
if flag&FmtShort != 0 {
// no leading func
} else {
if t.Recv() != nil {
b.WriteString("method")
tconv2(b, t.Recvs(), 0, mode, visited)
b.WriteByte(' ')
}
b.WriteString("func")
}
tconv2(b, t.Params(), 0, mode, visited)
switch t.NumResults() {
case 0:
// nothing to do
case 1:
b.WriteByte(' ')
tconv2(b, t.Results().Field(0).Type, 0, mode, visited) // struct->field->field's type
default:
b.WriteByte(' ')
tconv2(b, t.Results(), 0, mode, visited)
}
case TSTRUCT:
if m := t.StructType().Map; m != nil {
mt := m.MapType()
// Format the bucket struct for map[x]y as map.bucket[x]y.
// This avoids a recursive print that generates very long names.
switch t {
case mt.Bucket:
b.WriteString("map.bucket[")
case mt.Hmap:
b.WriteString("map.hdr[")
case mt.Hiter:
b.WriteString("map.iter[")
default:
Fatalf("unknown internal map type")
}
tconv2(b, m.Key(), 0, mode, visited)
b.WriteByte(']')
tconv2(b, m.Elem(), 0, mode, visited)
break
}
if funarg := t.StructType().Funarg; funarg != types.FunargNone {
b.WriteByte('(')
var flag1 FmtFlag
switch mode {
case FTypeId, FTypeIdName, FErr:
// no argument names on function signature, and no "noescape"/"nosplit" tags
flag1 = FmtShort
}
for i, f := range t.Fields().Slice() {
if i != 0 {
b.WriteString(", ")
}
fldconv(b, f, flag1, mode, visited, funarg)
}
b.WriteByte(')')
} else {
b.WriteString("struct {")
for i, f := range t.Fields().Slice() {
if i != 0 {
b.WriteByte(';')
}
b.WriteByte(' ')
fldconv(b, f, FmtLong, mode, visited, funarg)
}
if t.NumFields() != 0 {
b.WriteByte(' ')
}
b.WriteByte('}')
}
case TFORW:
b.WriteString("undefined")
if t.Sym != nil {
b.WriteByte(' ')
sconv2(b, t.Sym, 0, mode)
}
case TUNSAFEPTR:
b.WriteString("unsafe.Pointer")
case Txxx:
b.WriteString("Txxx")
default:
// Don't know how to handle - fall back to detailed prints.
b.WriteString(mode.Sprintf("%v <%v>", t.Etype, t.Sym))
}
}
// Statements which may be rendered with a simplestmt as init.
func stmtwithinit(op Op) bool {
switch op {
case OIF, OFOR, OFORUNTIL, OSWITCH:
return true
}
return false
}
func (n *Node) stmtfmt(s fmt.State, mode fmtMode) {
// some statements allow for an init, but at most one,
// but we may have an arbitrary number added, eg by typecheck