objset.go raw

   1  // Code generated by "go test -run=Generate -write=all"; DO NOT EDIT.
   2  // Source: ../../cmd/compile/internal/types2/objset.go
   3  
   4  // Copyright 2013 The Go Authors. All rights reserved.
   5  // Use of this source code is governed by a BSD-style
   6  // license that can be found in the LICENSE file.
   7  
   8  // This file implements objsets.
   9  //
  10  // An objset is similar to a Scope but objset elements
  11  // are identified by their unique id, instead of their
  12  // object name.
  13  
  14  package types
  15  
  16  // An objset is a set of objects identified by their unique id.
  17  // The zero value for objset is a ready-to-use empty objset.
  18  type objset map[string]Object // initialized lazily
  19  
  20  // insert attempts to insert an object obj into objset s.
  21  // If s already contains an alternative object alt with
  22  // the same name, insert leaves s unchanged and returns alt.
  23  // Otherwise it inserts obj and returns nil.
  24  func (s *objset) insert(obj Object) Object {
  25  	id := obj.Id()
  26  	if alt := (*s)[id]; alt != nil {
  27  		return alt
  28  	}
  29  	if *s == nil {
  30  		*s = make(map[string]Object)
  31  	}
  32  	(*s)[id] = obj
  33  	return nil
  34  }
  35