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| 1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef PageMemory_h | 5 #ifndef PageMemory_h |
| 6 #define PageMemory_h | 6 #define PageMemory_h |
| 7 | 7 |
| 8 #include "platform/heap/HeapPage.h" | 8 #include "platform/heap/HeapPage.h" |
| 9 #include "platform/wtf/Allocator.h" | 9 #include "platform/wtf/Allocator.h" |
| 10 #include "platform/wtf/Assertions.h" | 10 #include "platform/wtf/Assertions.h" |
| 11 #include "platform/wtf/Compiler.h" | 11 #include "platform/wtf/Compiler.h" |
| 12 #include "platform/wtf/allocator/Partitions.h" | 12 #include "platform/wtf/allocator/Partitions.h" |
| 13 | 13 |
| 14 namespace blink { | 14 namespace blink { |
| 15 | 15 |
| 16 class RegionTree; | 16 class RegionTree; |
| 17 class RegionTreeNode; | 17 class RegionTreeNode; |
| 18 | 18 |
| 19 class MemoryRegion { | 19 class MemoryRegion { |
| 20 USING_FAST_MALLOC(MemoryRegion); | 20 USING_FAST_MALLOC(MemoryRegion); |
| 21 | 21 |
| 22 public: | 22 public: |
| 23 MemoryRegion(Address base, size_t size) : base_(base), size_(size) { | 23 MemoryRegion(Address base, size_t size) : base_(base), size_(size) { |
| 24 ASSERT(size > 0); | 24 DCHECK_GT(size, 0u); |
| 25 } | 25 } |
| 26 | 26 |
| 27 bool Contains(Address addr) const { | 27 bool Contains(Address addr) const { |
| 28 return base_ <= addr && addr < (base_ + size_); | 28 return base_ <= addr && addr < (base_ + size_); |
| 29 } | 29 } |
| 30 | 30 |
| 31 bool Contains(const MemoryRegion& other) const { | 31 bool Contains(const MemoryRegion& other) const { |
| 32 return Contains(other.base_) && Contains(other.base_ + other.size_ - 1); | 32 return Contains(other.base_) && Contains(other.base_ + other.size_ - 1); |
| 33 } | 33 } |
| 34 | 34 |
| (...skipping 15 matching lines...) Expand all Loading... |
| 50 // whole. The PageMemoryRegion allows us to do that by keeping track | 50 // whole. The PageMemoryRegion allows us to do that by keeping track |
| 51 // of the number of pages using it in order to be able to release all | 51 // of the number of pages using it in order to be able to release all |
| 52 // of the virtual address space when there are no more pages using it. | 52 // of the virtual address space when there are no more pages using it. |
| 53 class PageMemoryRegion : public MemoryRegion { | 53 class PageMemoryRegion : public MemoryRegion { |
| 54 public: | 54 public: |
| 55 ~PageMemoryRegion(); | 55 ~PageMemoryRegion(); |
| 56 | 56 |
| 57 void PageDeleted(Address); | 57 void PageDeleted(Address); |
| 58 | 58 |
| 59 void MarkPageUsed(Address page) { | 59 void MarkPageUsed(Address page) { |
| 60 ASSERT(!in_use_[Index(page)]); | 60 DCHECK(!in_use_[Index(page)]); |
| 61 in_use_[Index(page)] = true; | 61 in_use_[Index(page)] = true; |
| 62 } | 62 } |
| 63 | 63 |
| 64 void MarkPageUnused(Address page) { in_use_[Index(page)] = false; } | 64 void MarkPageUnused(Address page) { in_use_[Index(page)] = false; } |
| 65 | 65 |
| 66 static PageMemoryRegion* AllocateLargePage(size_t size, | 66 static PageMemoryRegion* AllocateLargePage(size_t size, |
| 67 RegionTree* region_tree) { | 67 RegionTree* region_tree) { |
| 68 return Allocate(size, 1, region_tree); | 68 return Allocate(size, 1, region_tree); |
| 69 } | 69 } |
| 70 | 70 |
| 71 static PageMemoryRegion* AllocateNormalPages(RegionTree* region_tree) { | 71 static PageMemoryRegion* AllocateNormalPages(RegionTree* region_tree) { |
| 72 return Allocate(kBlinkPageSize * kBlinkPagesPerRegion, kBlinkPagesPerRegion, | 72 return Allocate(kBlinkPageSize * kBlinkPagesPerRegion, kBlinkPagesPerRegion, |
| 73 region_tree); | 73 region_tree); |
| 74 } | 74 } |
| 75 | 75 |
| 76 BasePage* PageFromAddress(Address address) { | 76 BasePage* PageFromAddress(Address address) { |
| 77 ASSERT(Contains(address)); | 77 DCHECK(Contains(address)); |
| 78 if (!in_use_[Index(address)]) | 78 if (!in_use_[Index(address)]) |
| 79 return nullptr; | 79 return nullptr; |
| 80 if (is_large_page_) | 80 if (is_large_page_) |
| 81 return PageFromObject(Base()); | 81 return PageFromObject(Base()); |
| 82 return PageFromObject(address); | 82 return PageFromObject(address); |
| 83 } | 83 } |
| 84 | 84 |
| 85 private: | 85 private: |
| 86 PageMemoryRegion(Address base, size_t, unsigned num_pages, RegionTree*); | 86 PageMemoryRegion(Address base, size_t, unsigned num_pages, RegionTree*); |
| 87 | 87 |
| 88 unsigned Index(Address address) const { | 88 unsigned Index(Address address) const { |
| 89 ASSERT(Contains(address)); | 89 DCHECK(Contains(address)); |
| 90 if (is_large_page_) | 90 if (is_large_page_) |
| 91 return 0; | 91 return 0; |
| 92 size_t offset = BlinkPageAddress(address) - Base(); | 92 size_t offset = BlinkPageAddress(address) - Base(); |
| 93 ASSERT(offset % kBlinkPageSize == 0); | 93 DCHECK_EQ(offset % kBlinkPageSize, 0u); |
| 94 return offset / kBlinkPageSize; | 94 return offset / kBlinkPageSize; |
| 95 } | 95 } |
| 96 | 96 |
| 97 static PageMemoryRegion* Allocate(size_t, unsigned num_pages, RegionTree*); | 97 static PageMemoryRegion* Allocate(size_t, unsigned num_pages, RegionTree*); |
| 98 | 98 |
| 99 const bool is_large_page_; | 99 const bool is_large_page_; |
| 100 // A thread owns a page, but not a region. Represent the in-use | 100 // A thread owns a page, but not a region. Represent the in-use |
| 101 // bitmap such that thread non-interference comes for free. | 101 // bitmap such that thread non-interference comes for free. |
| 102 bool in_use_[kBlinkPagesPerRegion]; | 102 bool in_use_[kBlinkPagesPerRegion]; |
| 103 int num_pages_; | 103 int num_pages_; |
| (...skipping 104 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
| 208 private: | 208 private: |
| 209 PageMemory(PageMemoryRegion* reserved, const MemoryRegion& writable); | 209 PageMemory(PageMemoryRegion* reserved, const MemoryRegion& writable); |
| 210 | 210 |
| 211 PageMemoryRegion* reserved_; | 211 PageMemoryRegion* reserved_; |
| 212 MemoryRegion writable_; | 212 MemoryRegion writable_; |
| 213 }; | 213 }; |
| 214 | 214 |
| 215 } // namespace blink | 215 } // namespace blink |
| 216 | 216 |
| 217 #endif | 217 #endif |
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