1 // Copyright 2023 The Pigweed Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not 4 // use this file except in compliance with the License. You may obtain a copy of 5 // the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 12 // License for the specific language governing permissions and limitations under 13 // the License. 14 15 #include "pw_allocator/bump_allocator.h" 16 17 #include "pw_allocator/buffer.h" 18 #include "pw_bytes/alignment.h" 19 20 namespace pw::allocator { 21 Init(ByteSpan region)22void BumpAllocator::Init(ByteSpan region) { 23 Reset(); 24 remaining_ = region; 25 } 26 DoAllocate(Layout layout)27void* BumpAllocator::DoAllocate(Layout layout) { 28 size_t remaining = remaining_.size(); 29 ByteSpan region = GetAlignedSubspan(remaining_, layout.alignment()); 30 if (region.size() < layout.size()) { 31 return nullptr; 32 } 33 remaining_ = region.subspan(layout.size()); 34 allocated_ += remaining - remaining_.size(); 35 return region.data(); 36 } 37 DoDeallocate(void *)38void BumpAllocator::DoDeallocate(void*) {} 39 Reset()40void BumpAllocator::Reset() { 41 if (owned_ != nullptr) { 42 owned_->Destroy(); 43 } 44 remaining_ = ByteSpan(); 45 } 46 47 } // namespace pw::allocator 48