| // Copyright (C) 2015 The Android Open Source Project |
| // |
| // 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 |
| } |
