| // Copyright 2023 The Pigweed Authors |
| // |
| // 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 |
| // |
| // https://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. |
| |
| #include "pw_allocator/fallback_allocator.h" |
| |
| #include "pw_allocator/capability.h" |
| #include "pw_assert/check.h" |
| |
| namespace pw::allocator { |
| |
| FallbackAllocator::FallbackAllocator(Allocator& primary, Allocator& secondary) |
| : Allocator(primary.capabilities() | secondary.capabilities()), |
| primary_(primary), |
| secondary_(secondary) { |
| PW_CHECK(primary.HasCapability(Capability::kImplementsQuery)); |
| } |
| |
| void* FallbackAllocator::DoAllocate(Layout layout) { |
| void* ptr = primary_.Allocate(layout); |
| return ptr != nullptr ? ptr : secondary_.Allocate(layout); |
| } |
| |
| void FallbackAllocator::DoDeallocate(void* ptr) { |
| if (Query(primary_, ptr).ok()) { |
| primary_.Deallocate(ptr); |
| } else { |
| secondary_.Deallocate(ptr); |
| } |
| } |
| |
| void FallbackAllocator::DoDeallocate(void* ptr, Layout) { DoDeallocate(ptr); } |
| |
| bool FallbackAllocator::DoResize(void* ptr, size_t new_size) { |
| return Query(primary_, ptr).ok() ? primary_.Resize(ptr, new_size) |
| : secondary_.Resize(ptr, new_size); |
| } |
| |
| StatusWithSize FallbackAllocator::DoGetCapacity() const { |
| StatusWithSize primary = primary_.GetCapacity(); |
| if (!primary.ok()) { |
| return primary; |
| } |
| StatusWithSize secondary = secondary_.GetCapacity(); |
| if (!secondary.ok()) { |
| return secondary; |
| } |
| return StatusWithSize(primary.size() + secondary.size()); |
| } |
| |
| Result<Layout> FallbackAllocator::DoGetRequestedLayout(const void* ptr) const { |
| Result<Layout> primary = GetRequestedLayout(primary_, ptr); |
| return primary.ok() ? primary |
| : CombineResults(primary.status(), |
| GetRequestedLayout(secondary_, ptr)); |
| } |
| |
| Result<Layout> FallbackAllocator::DoGetUsableLayout(const void* ptr) const { |
| Result<Layout> primary = GetUsableLayout(primary_, ptr); |
| return primary.ok() ? primary |
| : CombineResults(primary.status(), |
| GetUsableLayout(secondary_, ptr)); |
| } |
| |
| Result<Layout> FallbackAllocator::DoGetAllocatedLayout(const void* ptr) const { |
| Result<Layout> primary = GetAllocatedLayout(primary_, ptr); |
| return primary.ok() ? primary |
| : CombineResults(primary.status(), |
| GetAllocatedLayout(secondary_, ptr)); |
| } |
| |
| Status FallbackAllocator::DoQuery(const void* ptr) const { |
| Status status = Query(primary_, ptr); |
| return status.ok() ? status : Query(secondary_, ptr); |
| } |
| |
| /// Combines a secondary result with a primary, non-ok status. |
| Result<Layout> FallbackAllocator::CombineResults( |
| Status primary, const Result<Layout>& secondary) const { |
| if (!secondary.ok() && !primary.IsUnimplemented()) { |
| return primary; |
| } |
| return secondary; |
| } |
| |
| } // namespace pw::allocator |