Source file src/cmd/compile/internal/ssa/id.go

     1	// Copyright 2015 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	package ssa
     6	
     7	type ID int32
     8	
     9	// idAlloc provides an allocator for unique integers.
    10	type idAlloc struct {
    11		last ID
    12	}
    13	
    14	// get allocates an ID and returns it. IDs are always > 0.
    15	func (a *idAlloc) get() ID {
    16		x := a.last
    17		x++
    18		if x == 1<<31-1 {
    19			panic("too many ids for this function")
    20		}
    21		a.last = x
    22		return x
    23	}
    24	
    25	// num returns the maximum ID ever returned + 1.
    26	func (a *idAlloc) num() int {
    27		return int(a.last + 1)
    28	}
    29	

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