go const 源码
golang const 代码
文件路径：/src/cmd/compile/internal/typecheck/const.go
// Copyright 2009 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 typecheck
import (
"fmt"
"go/constant"
"go/token"
"math"
"math/big"
"strings"
"unicode"
"cmd/compile/internal/base"
"cmd/compile/internal/ir"
"cmd/compile/internal/types"
)
func roundFloat(v constant.Value, sz int64) constant.Value {
switch sz {
case 4:
f, _ := constant.Float32Val(v)
return makeFloat64(float64(f))
case 8:
f, _ := constant.Float64Val(v)
return makeFloat64(f)
}
base.Fatalf("unexpected size: %v", sz)
panic("unreachable")
}
// truncate float literal fv to 32-bit or 64-bit precision
// according to type; return truncated value.
func truncfltlit(v constant.Value, t *types.Type) constant.Value {
if t.IsUntyped() || overflow(v, t) {
// If there was overflow, simply continuing would set the
// value to Inf which in turn would lead to spurious follow-on
// errors. Avoid this by returning the existing value.
return v
}
return roundFloat(v, t.Size())
}
// truncate Real and Imag parts of Mpcplx to 32-bit or 64-bit
// precision, according to type; return truncated value. In case of
// overflow, calls Errorf but does not truncate the input value.
func trunccmplxlit(v constant.Value, t *types.Type) constant.Value {
if t.IsUntyped() || overflow(v, t) {
// If there was overflow, simply continuing would set the
// value to Inf which in turn would lead to spurious follow-on
// errors. Avoid this by returning the existing value.
return v
}
fsz := t.Size() / 2
return makeComplex(roundFloat(constant.Real(v), fsz), roundFloat(constant.Imag(v), fsz))
}
// TODO(mdempsky): Replace these with better APIs.
func convlit(n ir.Node, t *types.Type) ir.Node { return convlit1(n, t, false, nil) }
func DefaultLit(n ir.Node, t *types.Type) ir.Node { return convlit1(n, t, false, nil) }
// convlit1 converts an untyped expression n to type t. If n already
// has a type, convlit1 has no effect.
//
// For explicit conversions, t must be non-nil, and integer-to-string
// conversions are allowed.
//
// For implicit conversions (e.g., assignments), t may be nil; if so,
// n is converted to its default type.
//
// If there's an error converting n to t, context is used in the error
// message.
func convlit1(n ir.Node, t *types.Type, explicit bool, context func() string) ir.Node {
if explicit && t == nil {
base.Fatalf("explicit conversion missing type")
}
if t != nil && t.IsUntyped() {
base.Fatalf("bad conversion to untyped: %v", t)
}
if n == nil || n.Type() == nil {
// Allow sloppy callers.
return n
}
if !n.Type().IsUntyped() {
// Already typed; nothing to do.
return n
}
// Nil is technically not a constant, so handle it specially.
if n.Type().Kind() == types.TNIL {
if n.Op() != ir.ONIL {
base.Fatalf("unexpected op: %v (%v)", n, n.Op())
}
n = ir.Copy(n)
if t == nil {
base.Fatalf("use of untyped nil")
}
if !t.HasNil() {
// Leave for caller to handle.
return n
}
n.SetType(t)
return n
}
if t == nil || !ir.OKForConst[t.Kind()] {
t = defaultType(n.Type())
}
switch n.Op() {
default:
base.Fatalf("unexpected untyped expression: %v", n)
case ir.OLITERAL:
v := convertVal(n.Val(), t, explicit)
if v.Kind() == constant.Unknown {
n = ir.NewConstExpr(n.Val(), n)
break
}
n = ir.NewConstExpr(v, n)
n.SetType(t)
return n
case ir.OPLUS, ir.ONEG, ir.OBITNOT, ir.ONOT, ir.OREAL, ir.OIMAG:
ot := operandType(n.Op(), t)
if ot == nil {
n = DefaultLit(n, nil)
break
}
n := n.(*ir.UnaryExpr)
n.X = convlit(n.X, ot)
if n.X.Type() == nil {
n.SetType(nil)
return n
}
n.SetType(t)
return n
case ir.OADD, ir.OSUB, ir.OMUL, ir.ODIV, ir.OMOD, ir.OOR, ir.OXOR, ir.OAND, ir.OANDNOT, ir.OOROR, ir.OANDAND, ir.OCOMPLEX:
ot := operandType(n.Op(), t)
if ot == nil {
n = DefaultLit(n, nil)
break
}
var l, r ir.Node
switch n := n.(type) {
case *ir.BinaryExpr:
n.X = convlit(n.X, ot)
n.Y = convlit(n.Y, ot)
l, r = n.X, n.Y
case *ir.LogicalExpr:
n.X = convlit(n.X, ot)
n.Y = convlit(n.Y, ot)
l, r = n.X, n.Y
}
if l.Type() == nil || r.Type() == nil {
n.SetType(nil)
return n
}
if !types.Identical(l.Type(), r.Type()) {
base.Errorf("invalid operation: %v (mismatched types %v and %v)", n, l.Type(), r.Type())
n.SetType(nil)
return n
}
n.SetType(t)
return n
case ir.OEQ, ir.ONE, ir.OLT, ir.OLE, ir.OGT, ir.OGE:
n := n.(*ir.BinaryExpr)
if !t.IsBoolean() {
break
}
n.SetType(t)
return n
case ir.OLSH, ir.ORSH:
n := n.(*ir.BinaryExpr)
n.X = convlit1(n.X, t, explicit, nil)
n.SetType(n.X.Type())
if n.Type() != nil && !n.Type().IsInteger() {
base.Errorf("invalid operation: %v (shift of type %v)", n, n.Type())
n.SetType(nil)
}
return n
}
if explicit {
base.Fatalf("cannot convert %L to type %v", n, t)
} else if context != nil {
base.Fatalf("cannot use %L as type %v in %s", n, t, context())
} else {
base.Fatalf("cannot use %L as type %v", n, t)
}
n.SetType(nil)
return n
}
func operandType(op ir.Op, t *types.Type) *types.Type {
switch op {
case ir.OCOMPLEX:
if t.IsComplex() {
return types.FloatForComplex(t)
}
case ir.OREAL, ir.OIMAG:
if t.IsFloat() {
return types.ComplexForFloat(t)
}
default:
if okfor[op][t.Kind()] {
return t
}
}
return nil
}
// convertVal converts v into a representation appropriate for t. If
// no such representation exists, it returns Val{} instead.
//
// If explicit is true, then conversions from integer to string are
// also allowed.
func convertVal(v constant.Value, t *types.Type, explicit bool) constant.Value {
switch ct := v.Kind(); ct {
case constant.Bool:
if t.IsBoolean() {
return v
}
case constant.String:
if t.IsString() {
return v
}
case constant.Int:
if explicit && t.IsString() {
return tostr(v)
}
fallthrough
case constant.Float, constant.Complex:
switch {
case t.IsInteger():
v = toint(v)
overflow(v, t)
return v
case t.IsFloat():
v = toflt(v)
v = truncfltlit(v, t)
return v
case t.IsComplex():
v = tocplx(v)
v = trunccmplxlit(v, t)
return v
}
}
return constant.MakeUnknown()
}
func tocplx(v constant.Value) constant.Value {
return constant.ToComplex(v)
}
func toflt(v constant.Value) constant.Value {
if v.Kind() == constant.Complex {
if constant.Sign(constant.Imag(v)) != 0 {
base.Errorf("constant %v truncated to real", v)
}
v = constant.Real(v)
}
return constant.ToFloat(v)
}
func toint(v constant.Value) constant.Value {
if v.Kind() == constant.Complex {
if constant.Sign(constant.Imag(v)) != 0 {
base.Errorf("constant %v truncated to integer", v)
}
v = constant.Real(v)
}
if v := constant.ToInt(v); v.Kind() == constant.Int {
return v
}
// The value of v cannot be represented as an integer;
// so we need to print an error message.
// Unfortunately some float values cannot be
// reasonably formatted for inclusion in an error
// message (example: 1 + 1e-100), so first we try to
// format the float; if the truncation resulted in
// something that looks like an integer we omit the
// value from the error message.
// (See issue #11371).
f := ir.BigFloat(v)
if f.MantExp(nil) > 2*ir.ConstPrec {
base.Errorf("integer too large")
} else {
var t big.Float
t.Parse(fmt.Sprint(v), 0)
if t.IsInt() {
base.Errorf("constant truncated to integer")
} else {
base.Errorf("constant %v truncated to integer", v)
}
}
// Prevent follow-on errors.
// TODO(mdempsky): Use constant.MakeUnknown() instead.
return constant.MakeInt64(1)
}
// overflow reports whether constant value v is too large
// to represent with type t, and emits an error message if so.
func overflow(v constant.Value, t *types.Type) bool {
// v has already been converted
// to appropriate form for t.
if t.IsUntyped() {
return false
}
if v.Kind() == constant.Int && constant.BitLen(v) > ir.ConstPrec {
base.Errorf("integer too large")
return true
}
if ir.ConstOverflow(v, t) {
base.Errorf("constant %v overflows %v", types.FmtConst(v, false), t)
return true
}
return false
}
func tostr(v constant.Value) constant.Value {
if v.Kind() == constant.Int {
r := unicode.ReplacementChar
if x, ok := constant.Uint64Val(v); ok && x <= unicode.MaxRune {
r = rune(x)
}
v = constant.MakeString(string(r))
}
return v
}
var tokenForOp = [...]token.Token{
ir.OPLUS: token.ADD,
ir.ONEG: token.SUB,
ir.ONOT: token.NOT,
ir.OBITNOT: token.XOR,
ir.OADD: token.ADD,
ir.OSUB: token.SUB,
ir.OMUL: token.MUL,
ir.ODIV: token.QUO,
ir.OMOD: token.REM,
ir.OOR: token.OR,
ir.OXOR: token.XOR,
ir.OAND: token.AND,
ir.OANDNOT: token.AND_NOT,
ir.OOROR: token.LOR,
ir.OANDAND: token.LAND,
ir.OEQ: token.EQL,
ir.ONE: token.NEQ,
ir.OLT: token.LSS,
ir.OLE: token.LEQ,
ir.OGT: token.GTR,
ir.OGE: token.GEQ,
ir.OLSH: token.SHL,
ir.ORSH: token.SHR,
}
// EvalConst returns a constant-evaluated expression equivalent to n.
// If n is not a constant, EvalConst returns n.
// Otherwise, EvalConst returns a new OLITERAL with the same value as n,
// and with .Orig pointing back to n.
func EvalConst(n ir.Node) ir.Node {
// Pick off just the opcodes that can be constant evaluated.
switch n.Op() {
case ir.OPLUS, ir.ONEG, ir.OBITNOT, ir.ONOT:
n := n.(*ir.UnaryExpr)
nl := n.X
if nl.Op() == ir.OLITERAL {
var prec uint
if n.Type().IsUnsigned() {
prec = uint(n.Type().Size() * 8)
}
return OrigConst(n, constant.UnaryOp(tokenForOp[n.Op()], nl.Val(), prec))
}
case ir.OADD, ir.OSUB, ir.OMUL, ir.ODIV, ir.OMOD, ir.OOR, ir.OXOR, ir.OAND, ir.OANDNOT:
n := n.(*ir.BinaryExpr)
nl, nr := n.X, n.Y
if nl.Op() == ir.OLITERAL && nr.Op() == ir.OLITERAL {
rval := nr.Val()
// check for divisor underflow in complex division (see issue 20227)
if n.Op() == ir.ODIV && n.Type().IsComplex() && constant.Sign(square(constant.Real(rval))) == 0 && constant.Sign(square(constant.Imag(rval))) == 0 {
base.Errorf("complex division by zero")
n.SetType(nil)
return n
}
if (n.Op() == ir.ODIV || n.Op() == ir.OMOD) && constant.Sign(rval) == 0 {
base.Errorf("division by zero")
n.SetType(nil)
return n
}
tok := tokenForOp[n.Op()]
if n.Op() == ir.ODIV && n.Type().IsInteger() {
tok = token.QUO_ASSIGN // integer division
}
return OrigConst(n, constant.BinaryOp(nl.Val(), tok, rval))
}
case ir.OOROR, ir.OANDAND:
n := n.(*ir.LogicalExpr)
nl, nr := n.X, n.Y
if nl.Op() == ir.OLITERAL && nr.Op() == ir.OLITERAL {
return OrigConst(n, constant.BinaryOp(nl.Val(), tokenForOp[n.Op()], nr.Val()))
}
case ir.OEQ, ir.ONE, ir.OLT, ir.OLE, ir.OGT, ir.OGE:
n := n.(*ir.BinaryExpr)
nl, nr := n.X, n.Y
if nl.Op() == ir.OLITERAL && nr.Op() == ir.OLITERAL {
return OrigBool(n, constant.Compare(nl.Val(), tokenForOp[n.Op()], nr.Val()))
}
case ir.OLSH, ir.ORSH:
n := n.(*ir.BinaryExpr)
nl, nr := n.X, n.Y
if nl.Op() == ir.OLITERAL && nr.Op() == ir.OLITERAL {
// shiftBound from go/types; "so we can express smallestFloat64" (see issue #44057)
const shiftBound = 1023 - 1 + 52
s, ok := constant.Uint64Val(nr.Val())
if !ok || s > shiftBound {
base.Errorf("invalid shift count %v", nr)
n.SetType(nil)
break
}
return OrigConst(n, constant.Shift(toint(nl.Val()), tokenForOp[n.Op()], uint(s)))
}
case ir.OCONV, ir.ORUNESTR:
n := n.(*ir.ConvExpr)
nl := n.X
if ir.OKForConst[n.Type().Kind()] && nl.Op() == ir.OLITERAL {
return OrigConst(n, convertVal(nl.Val(), n.Type(), true))
}
case ir.OCONVNOP:
n := n.(*ir.ConvExpr)
nl := n.X
if ir.OKForConst[n.Type().Kind()] && nl.Op() == ir.OLITERAL {
// set so n.Orig gets OCONV instead of OCONVNOP
n.SetOp(ir.OCONV)
return OrigConst(n, nl.Val())
}
case ir.OADDSTR:
// Merge adjacent constants in the argument list.
n := n.(*ir.AddStringExpr)
s := n.List
need := 0
for i := 0; i < len(s); i++ {
if i == 0 || !ir.IsConst(s[i-1], constant.String) || !ir.IsConst(s[i], constant.String) {
// Can't merge s[i] into s[i-1]; need a slot in the list.
need++
}
}
if need == len(s) {
return n
}
if need == 1 {
var strs []string
for _, c := range s {
strs = append(strs, ir.StringVal(c))
}
return OrigConst(n, constant.MakeString(strings.Join(strs, "")))
}
newList := make([]ir.Node, 0, need)
for i := 0; i < len(s); i++ {
if ir.IsConst(s[i], constant.String) && i+1 < len(s) && ir.IsConst(s[i+1], constant.String) {
// merge from i up to but not including i2
var strs []string
i2 := i
for i2 < len(s) && ir.IsConst(s[i2], constant.String) {
strs = append(strs, ir.StringVal(s[i2]))
i2++
}
nl := ir.Copy(n).(*ir.AddStringExpr)
nl.List = s[i:i2]
newList = append(newList, OrigConst(nl, constant.MakeString(strings.Join(strs, ""))))
i = i2 - 1
} else {
newList = append(newList, s[i])
}
}
nn := ir.Copy(n).(*ir.AddStringExpr)
nn.List = newList
return nn
case ir.OCAP, ir.OLEN:
n := n.(*ir.UnaryExpr)
nl := n.X
switch nl.Type().Kind() {
case types.TSTRING:
if ir.IsConst(nl, constant.String) {
return OrigInt(n, int64(len(ir.StringVal(nl))))
}
case types.TARRAY:
if !anyCallOrChan(nl) {
return OrigInt(n, nl.Type().NumElem())
}
}
case ir.OALIGNOF, ir.OOFFSETOF, ir.OSIZEOF:
n := n.(*ir.UnaryExpr)
return OrigInt(n, evalunsafe(n))
case ir.OREAL:
n := n.(*ir.UnaryExpr)
nl := n.X
if nl.Op() == ir.OLITERAL {
return OrigConst(n, constant.Real(nl.Val()))
}
case ir.OIMAG:
n := n.(*ir.UnaryExpr)
nl := n.X
if nl.Op() == ir.OLITERAL {
return OrigConst(n, constant.Imag(nl.Val()))
}
case ir.OCOMPLEX:
n := n.(*ir.BinaryExpr)
nl, nr := n.X, n.Y
if nl.Op() == ir.OLITERAL && nr.Op() == ir.OLITERAL {
return OrigConst(n, makeComplex(nl.Val(), nr.Val()))
}
}
return n
}
func makeFloat64(f float64) constant.Value {
if math.IsInf(f, 0) {
base.Fatalf("infinity is not a valid constant")
}
return constant.MakeFloat64(f)
}
func makeComplex(real, imag constant.Value) constant.Value {
return constant.BinaryOp(constant.ToFloat(real), token.ADD, constant.MakeImag(constant.ToFloat(imag)))
}
func square(x constant.Value) constant.Value {
return constant.BinaryOp(x, token.MUL, x)
}
// For matching historical "constant OP overflow" error messages.
// TODO(mdempsky): Replace with error messages like go/types uses.
var overflowNames = [...]string{
ir.OADD: "addition",
ir.OSUB: "subtraction",
ir.OMUL: "multiplication",
ir.OLSH: "shift",
ir.OXOR: "bitwise XOR",
ir.OBITNOT: "bitwise complement",
}
// OrigConst returns an OLITERAL with orig n and value v.
func OrigConst(n ir.Node, v constant.Value) ir.Node {
lno := ir.SetPos(n)
v = convertVal(v, n.Type(), false)
base.Pos = lno
switch v.Kind() {
case constant.Int:
if constant.BitLen(v) <= ir.ConstPrec {
break
}
fallthrough
case constant.Unknown:
what := overflowNames[n.Op()]
if what == "" {
base.Fatalf("unexpected overflow: %v", n.Op())
}
base.ErrorfAt(n.Pos(), "constant %v overflow", what)
n.SetType(nil)
return n
}
return ir.NewConstExpr(v, n)
}
func OrigBool(n ir.Node, v bool) ir.Node {
return OrigConst(n, constant.MakeBool(v))
}
func OrigInt(n ir.Node, v int64) ir.Node {
return OrigConst(n, constant.MakeInt64(v))
}
// DefaultLit on both nodes simultaneously;
// if they're both ideal going in they better
// get the same type going out.
// force means must assign concrete (non-ideal) type.
// The results of defaultlit2 MUST be assigned back to l and r, e.g.
//
// n.Left, n.Right = defaultlit2(n.Left, n.Right, force)
func defaultlit2(l ir.Node, r ir.Node, force bool) (ir.Node, ir.Node) {
if l.Type() == nil || r.Type() == nil {
return l, r
}
if !l.Type().IsInterface() && !r.Type().IsInterface() {
// Can't mix bool with non-bool, string with non-string.
if l.Type().IsBoolean() != r.Type().IsBoolean() {
return l, r
}
if l.Type().IsString() != r.Type().IsString() {
return l, r
}
}
if !l.Type().IsUntyped() {
r = convlit(r, l.Type())
return l, r
}
if !r.Type().IsUntyped() {
l = convlit(l, r.Type())
return l, r
}
if !force {
return l, r
}
// Can't mix nil with anything untyped.
if ir.IsNil(l) || ir.IsNil(r) {
return l, r
}
t := defaultType(mixUntyped(l.Type(), r.Type()))
l = convlit(l, t)
r = convlit(r, t)
return l, r
}
func mixUntyped(t1, t2 *types.Type) *types.Type {
if t1 == t2 {
return t1
}
rank := func(t *types.Type) int {
switch t {
case types.UntypedInt:
return 0
case types.UntypedRune:
return 1
case types.UntypedFloat:
return 2
case types.UntypedComplex:
return 3
}
base.Fatalf("bad type %v", t)
panic("unreachable")
}
if rank(t2) > rank(t1) {
return t2
}
return t1
}
func defaultType(t *types.Type) *types.Type {
if !t.IsUntyped() || t.Kind() == types.TNIL {
return t
}
switch t {
case types.UntypedBool:
return types.Types[types.TBOOL]
case types.UntypedString:
return types.Types[types.TSTRING]
case types.UntypedInt:
return types.Types[types.TINT]
case types.UntypedRune:
return types.RuneType
case types.UntypedFloat:
return types.Types[types.TFLOAT64]
case types.UntypedComplex:
return types.Types[types.TCOMPLEX128]
}
base.Fatalf("bad type %v", t)
return nil
}
// IndexConst checks if Node n contains a constant expression
// representable as a non-negative int and returns its value.
// If n is not a constant expression, not representable as an
// integer, or negative, it returns -1. If n is too large, it
// returns -2.
func IndexConst(n ir.Node) int64 {
if n.Op() != ir.OLITERAL {
return -1
}
if !n.Type().IsInteger() && n.Type().Kind() != types.TIDEAL {
return -1
}
v := toint(n.Val())
if v.Kind() != constant.Int || constant.Sign(v) < 0 {
return -1
}
if ir.ConstOverflow(v, types.Types[types.TINT]) {
return -2
}
return ir.IntVal(types.Types[types.TINT], v)
}
// callOrChan reports whether n is a call or channel operation.
func callOrChan(n ir.Node) bool {
switch n.Op() {
case ir.OAPPEND,
ir.OCALL,
ir.OCALLFUNC,
ir.OCALLINTER,
ir.OCALLMETH,
ir.OCAP,
ir.OCLOSE,
ir.OCOMPLEX,
ir.OCOPY,
ir.ODELETE,
ir.OIMAG,
ir.OLEN,
ir.OMAKE,
ir.ONEW,
ir.OPANIC,
ir.OPRINT,
ir.OPRINTN,
ir.OREAL,
ir.ORECOVER,
ir.ORECV,
ir.OUNSAFEADD,
ir.OUNSAFESLICE:
return true
}
return false
}
// anyCallOrChan reports whether n contains any calls or channel operations.
func anyCallOrChan(n ir.Node) bool {
return ir.Any(n, func(n ir.Node) bool {
return callOrChan(n)
})
}
// evalunsafe evaluates a package unsafe operation and returns the result.
func evalunsafe(n ir.Node) int64 {
switch n.Op() {
case ir.OALIGNOF, ir.OSIZEOF:
n := n.(*ir.UnaryExpr)
n.X = Expr(n.X)
n.X = DefaultLit(n.X, nil)
tr := n.X.Type()
if tr == nil {
return 0
}
types.CalcSize(tr)
if n.Op() == ir.OALIGNOF {
return tr.Alignment()
}
return tr.Size()
case ir.OOFFSETOF:
// must be a selector.
n := n.(*ir.UnaryExpr)
// ODOT and ODOTPTR are allowed in case the OXDOT transformation has
// already happened (e.g. during -G=3 stenciling).
if n.X.Op() != ir.OXDOT && n.X.Op() != ir.ODOT && n.X.Op() != ir.ODOTPTR {
base.Errorf("invalid expression %v", n)
return 0
}
sel := n.X.(*ir.SelectorExpr)
// Remember base of selector to find it back after dot insertion.
// Since r->left may be mutated by typechecking, check it explicitly
// first to track it correctly.
sel.X = Expr(sel.X)
sbase := sel.X
// Implicit dot may already be resolved for instantiating generic function. So we
// need to remove any implicit dot until we reach the first non-implicit one, it's
// the right base selector. See issue #53137.
var clobberBase func(n ir.Node) ir.Node
clobberBase = func(n ir.Node) ir.Node {
if sel, ok := n.(*ir.SelectorExpr); ok && sel.Implicit() {
return clobberBase(sel.X)
}
return n
}
sbase = clobberBase(sbase)
tsel := Expr(sel)
n.X = tsel
if tsel.Type() == nil {
return 0
}
switch tsel.Op() {
case ir.ODOT, ir.ODOTPTR:
break
case ir.OMETHVALUE:
base.Errorf("invalid expression %v: argument is a method value", n)
return 0
default:
base.Errorf("invalid expression %v", n)
return 0
}
// Sum offsets for dots until we reach sbase.
var v int64
var next ir.Node
for r := tsel; r != sbase; r = next {
switch r.Op() {
case ir.ODOTPTR:
// For Offsetof(s.f), s may itself be a pointer,
// but accessing f must not otherwise involve
// indirection via embedded pointer types.
r := r.(*ir.SelectorExpr)
if r.X != sbase {
base.Errorf("invalid expression %v: selector implies indirection of embedded %v", n, r.X)
return 0
}
fallthrough
case ir.ODOT:
r := r.(*ir.SelectorExpr)
v += r.Offset()
next = r.X
default:
ir.Dump("unsafenmagic", tsel)
base.Fatalf("impossible %v node after dot insertion", r.Op())
}
}
return v
}
base.Fatalf("unexpected op %v", n.Op())
return 0
}
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