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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 #include "vm/virtual_memory.h" | 5 #include "vm/virtual_memory.h" |
6 | 6 |
7 #include "platform/assert.h" | 7 #include "platform/assert.h" |
8 #include "platform/utils.h" | 8 #include "platform/utils.h" |
9 | 9 |
10 namespace dart { | 10 namespace dart { |
11 | 11 |
12 bool VirtualMemory::InSamePage(uword address0, uword address1) { | 12 bool VirtualMemory::InSamePage(uword address0, uword address1) { |
13 return (Utils::RoundDown(address0, PageSize()) == | 13 return (Utils::RoundDown(address0, PageSize()) == |
14 Utils::RoundDown(address1, PageSize())); | 14 Utils::RoundDown(address1, PageSize())); |
15 } | 15 } |
16 | 16 |
17 | |
18 void VirtualMemory::Truncate(intptr_t new_size, bool try_unmap) { | 17 void VirtualMemory::Truncate(intptr_t new_size, bool try_unmap) { |
19 ASSERT((new_size & (PageSize() - 1)) == 0); | 18 ASSERT((new_size & (PageSize() - 1)) == 0); |
20 ASSERT(new_size <= size()); | 19 ASSERT(new_size <= size()); |
21 if (try_unmap && | 20 if (try_unmap && |
22 (reserved_size_ == size()) && /* Don't create holes in reservation. */ | 21 (reserved_size_ == size()) && /* Don't create holes in reservation. */ |
23 FreeSubSegment(handle(), reinterpret_cast<void*>(start() + new_size), | 22 FreeSubSegment(handle(), reinterpret_cast<void*>(start() + new_size), |
24 size() - new_size)) { | 23 size() - new_size)) { |
25 reserved_size_ = new_size; | 24 reserved_size_ = new_size; |
26 } | 25 } |
27 region_.Subregion(region_, 0, new_size); | 26 region_.Subregion(region_, 0, new_size); |
28 } | 27 } |
29 | 28 |
30 | |
31 VirtualMemory* VirtualMemory::ForImagePage(void* pointer, uword size) { | 29 VirtualMemory* VirtualMemory::ForImagePage(void* pointer, uword size) { |
32 // Memory for precompilated instructions was allocated by the embedder, so | 30 // Memory for precompilated instructions was allocated by the embedder, so |
33 // create a VirtualMemory without allocating. | 31 // create a VirtualMemory without allocating. |
34 MemoryRegion region(pointer, size); | 32 MemoryRegion region(pointer, size); |
35 VirtualMemory* memory = new VirtualMemory(region); | 33 VirtualMemory* memory = new VirtualMemory(region); |
36 memory->vm_owns_region_ = false; | 34 memory->vm_owns_region_ = false; |
37 return memory; | 35 return memory; |
38 } | 36 } |
39 | 37 |
40 } // namespace dart | 38 } // namespace dart |
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