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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package globals
import (
"go/token"
)
// SymKind specifies the kind of a global symbol. For example, a variable, const
// function, etc.
type SymKind int
// Constants for different kinds of symbols.
const (
KindUnknown SymKind = iota
KindImport
KindType
KindVar
KindConst
KindFunction
KindReceiver
KindParameter
KindResult
KindTag
)
type symbol struct {
kind SymKind
pos token.Pos
scope *scope
}
type scope struct {
outer *scope
syms map[string]*symbol
}
func newScope(outer *scope) *scope {
return &scope{
outer: outer,
syms: make(map[string]*symbol),
}
}
func (s *scope) isGlobal() bool {
return s.outer == nil
}
func (s *scope) lookup(n string) *symbol {
return s.syms[n]
}
func (s *scope) deepLookup(n string) *symbol {
for x := s; x != nil; x = x.outer {
if sym := x.lookup(n); sym != nil {
return sym
}
}
return nil
}
func (s *scope) add(name string, kind SymKind, pos token.Pos) {
if s.syms[name] != nil {
return
}
s.syms[name] = &symbol{
kind: kind,
pos: pos,
scope: s,
}
}
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