| // Copyright 2015 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 ssa | |
| type ID int32 | |
| // idAlloc provides an allocator for unique integers. | |
| type idAlloc struct { | |
| last ID | |
| } | |
| // get allocates an ID and returns it. IDs are always > 0. | |
| func (a *idAlloc) get() ID { | |
| x := a.last | |
| x++ | |
| if x == 1<<31-1 { | |
| panic("too many ids for this function") | |
| } | |
| a.last = x | |
| return x | |
| } | |
| // num returns the maximum ID ever returned + 1. | |
| func (a *idAlloc) num() int { | |
| return int(a.last + 1) | |
| } |