| // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| #include "vm/virtual_memory.h" |
| |
| #include "platform/assert.h" |
| #include "platform/utils.h" |
| |
| namespace dart { |
| |
| bool VirtualMemory::InSamePage(uword address0, uword address1) { |
| return (Utils::RoundDown(address0, PageSize()) == |
| Utils::RoundDown(address1, PageSize())); |
| } |
| |
| |
| void VirtualMemory::Truncate(intptr_t new_size, bool try_unmap) { |
| ASSERT((new_size & (PageSize() - 1)) == 0); |
| ASSERT(new_size <= size()); |
| if (try_unmap && |
| (reserved_size_ == size()) && /* Don't create holes in reservation. */ |
| FreeSubSegment(reinterpret_cast<void*>(start() + new_size), |
| size() - new_size)) { |
| reserved_size_ = new_size; |
| } |
| region_.Subregion(region_, 0, new_size); |
| } |
| |
| } // namespace dart |
