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allocator.go
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/
allocator.go
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// Copyright (C) 2017 Google Inc.
//
// 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 builder
type allocator struct {
alignment uint64
size uint64
head uint64
}
func max(a, b uint64) uint64 {
if a > b {
return a
} else {
return b
}
}
func align(val, by uint64) uint64 {
return ((val + by - 1) / by) * by
}
func (a *allocator) alloc(size uint64) uint64 {
ptr := align(a.head, a.alignment)
a.head = ptr + size
a.size = max(a.size, a.head)
return ptr
}
func (a *allocator) reset() {
a.head = 0
}