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// Copyright 2020 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
// sanitizeInfo walks the types contained in info to ensure that all instances
// are expanded.
func sanitizeInfo(info *Info) {
var s sanitizer = make(map[Type]Type)
// Note: Some map entries are not references.
// If modified, they must be assigned back.
for e, tv := range info.Types {
tv.Type = s.typ(tv.Type)
info.Types[e] = tv
}
for e, inf := range info.Inferred {
for i, targ := range inf.Targs {
inf.Targs[i] = s.typ(targ)
}
inf.Sig = s.typ(inf.Sig).(*Signature)
info.Inferred[e] = inf
}
for _, obj := range info.Defs {
if obj != nil {
obj.setType(s.typ(obj.Type()))
}
}
for _, obj := range info.Uses {
if obj != nil {
obj.setType(s.typ(obj.Type()))
}
}
// TODO(gri) sanitize as needed
// - info.Implicits
// - info.Selections
// - info.Scopes
// - info.InitOrder
}
type sanitizer map[Type]Type
func (s sanitizer) typ(typ Type) Type {
if t, found := s[typ]; found {
return t
}
s[typ] = typ
switch t := typ.(type) {
case nil, *Basic, *bottom, *top:
// nothing to do
case *Array:
t.elem = s.typ(t.elem)
case *Slice:
t.elem = s.typ(t.elem)
case *Struct:
s.varList(t.fields)
case *Pointer:
t.base = s.typ(t.base)
case *Tuple:
s.tuple(t)
case *Signature:
s.var_(t.recv)
s.tuple(t.params)
s.tuple(t.results)
case *Sum:
s.typeList(t.types)
case *Interface:
s.funcList(t.methods)
s.typ(t.types)
s.typeList(t.embeddeds)
s.funcList(t.allMethods)
s.typ(t.allTypes)
case *Map:
t.key = s.typ(t.key)
t.elem = s.typ(t.elem)
case *Chan:
t.elem = s.typ(t.elem)
case *Named:
t.orig = s.typ(t.orig)
t.underlying = s.typ(t.underlying)
s.typeList(t.targs)
s.funcList(t.methods)
case *TypeParam:
t.bound = s.typ(t.bound)
case *instance:
typ = t.expand()
s[t] = typ
default:
panic("unimplemented")
}
return typ
}
func (s sanitizer) var_(v *Var) {
if v != nil {
v.typ = s.typ(v.typ)
}
}
func (s sanitizer) varList(list []*Var) {
for _, v := range list {
s.var_(v)
}
}
func (s sanitizer) tuple(t *Tuple) {
if t != nil {
s.varList(t.vars)
}
}
func (s sanitizer) func_(f *Func) {
if f != nil {
f.typ = s.typ(f.typ)
}
}
func (s sanitizer) funcList(list []*Func) {
for _, f := range list {
s.func_(f)
}
}
func (s sanitizer) typeList(list []Type) {
for i, t := range list {
list[i] = s.typ(t)
}
}
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