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| 1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2013 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 #include "base/memory/discardable_memory.h" | 5 #include "base/memory/discardable_memory.h" |
| 6 | 6 |
| 7 #include <mach/mach.h> | 7 #include <mach/mach.h> |
| 8 | 8 |
| 9 #include "base/basictypes.h" | 9 #include "base/basictypes.h" |
| 10 #include "base/compiler_specific.h" | 10 #include "base/compiler_specific.h" |
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| 49 | 49 |
| 50 bool Initialize() { return Lock() != DISCARDABLE_MEMORY_LOCK_STATUS_FAILED; } | 50 bool Initialize() { return Lock() != DISCARDABLE_MEMORY_LOCK_STATUS_FAILED; } |
| 51 | 51 |
| 52 virtual ~DiscardableMemoryMac() { | 52 virtual ~DiscardableMemoryMac() { |
| 53 if (is_locked_) | 53 if (is_locked_) |
| 54 Unlock(); | 54 Unlock(); |
| 55 g_shared_state.Pointer()->manager.Unregister(this); | 55 g_shared_state.Pointer()->manager.Unregister(this); |
| 56 } | 56 } |
| 57 | 57 |
| 58 // Overridden from DiscardableMemory: | 58 // Overridden from DiscardableMemory: |
| 59 virtual DiscardableMemoryLockStatus Lock() OVERRIDE { | 59 virtual DiscardableMemoryLockStatus Lock() override { |
| 60 DCHECK(!is_locked_); | 60 DCHECK(!is_locked_); |
| 61 | 61 |
| 62 bool purged = false; | 62 bool purged = false; |
| 63 if (!g_shared_state.Pointer()->manager.AcquireLock(this, &purged)) | 63 if (!g_shared_state.Pointer()->manager.AcquireLock(this, &purged)) |
| 64 return DISCARDABLE_MEMORY_LOCK_STATUS_FAILED; | 64 return DISCARDABLE_MEMORY_LOCK_STATUS_FAILED; |
| 65 | 65 |
| 66 is_locked_ = true; | 66 is_locked_ = true; |
| 67 return purged ? DISCARDABLE_MEMORY_LOCK_STATUS_PURGED | 67 return purged ? DISCARDABLE_MEMORY_LOCK_STATUS_PURGED |
| 68 : DISCARDABLE_MEMORY_LOCK_STATUS_SUCCESS; | 68 : DISCARDABLE_MEMORY_LOCK_STATUS_SUCCESS; |
| 69 } | 69 } |
| 70 | 70 |
| 71 virtual void Unlock() OVERRIDE { | 71 virtual void Unlock() override { |
| 72 DCHECK(is_locked_); | 72 DCHECK(is_locked_); |
| 73 g_shared_state.Pointer()->manager.ReleaseLock(this); | 73 g_shared_state.Pointer()->manager.ReleaseLock(this); |
| 74 is_locked_ = false; | 74 is_locked_ = false; |
| 75 } | 75 } |
| 76 | 76 |
| 77 virtual void* Memory() const OVERRIDE { | 77 virtual void* Memory() const override { |
| 78 DCHECK(is_locked_); | 78 DCHECK(is_locked_); |
| 79 return reinterpret_cast<void*>(memory_.address()); | 79 return reinterpret_cast<void*>(memory_.address()); |
| 80 } | 80 } |
| 81 | 81 |
| 82 // Overridden from internal::DiscardableMemoryManagerAllocation: | 82 // Overridden from internal::DiscardableMemoryManagerAllocation: |
| 83 virtual bool AllocateAndAcquireLock() OVERRIDE { | 83 virtual bool AllocateAndAcquireLock() override { |
| 84 kern_return_t ret; | 84 kern_return_t ret; |
| 85 bool persistent; | 85 bool persistent; |
| 86 if (!memory_.size()) { | 86 if (!memory_.size()) { |
| 87 vm_address_t address = 0; | 87 vm_address_t address = 0; |
| 88 ret = vm_allocate( | 88 ret = vm_allocate( |
| 89 mach_task_self(), | 89 mach_task_self(), |
| 90 &address, | 90 &address, |
| 91 bytes_, | 91 bytes_, |
| 92 VM_FLAGS_ANYWHERE | VM_FLAGS_PURGABLE | kDiscardableMemoryTag); | 92 VM_FLAGS_ANYWHERE | VM_FLAGS_PURGABLE | kDiscardableMemoryTag); |
| 93 MACH_CHECK(ret == KERN_SUCCESS, ret) << "vm_allocate"; | 93 MACH_CHECK(ret == KERN_SUCCESS, ret) << "vm_allocate"; |
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| 116 memory_.address(), | 116 memory_.address(), |
| 117 VM_PURGABLE_SET_STATE, | 117 VM_PURGABLE_SET_STATE, |
| 118 &state); | 118 &state); |
| 119 MACH_CHECK(ret == KERN_SUCCESS, ret) << "vm_purgable_control"; | 119 MACH_CHECK(ret == KERN_SUCCESS, ret) << "vm_purgable_control"; |
| 120 if (state & VM_PURGABLE_EMPTY) | 120 if (state & VM_PURGABLE_EMPTY) |
| 121 persistent = false; | 121 persistent = false; |
| 122 | 122 |
| 123 return persistent; | 123 return persistent; |
| 124 } | 124 } |
| 125 | 125 |
| 126 virtual void ReleaseLock() OVERRIDE { | 126 virtual void ReleaseLock() override { |
| 127 int state = VM_PURGABLE_VOLATILE | VM_VOLATILE_GROUP_DEFAULT; | 127 int state = VM_PURGABLE_VOLATILE | VM_VOLATILE_GROUP_DEFAULT; |
| 128 kern_return_t ret = vm_purgable_control(mach_task_self(), | 128 kern_return_t ret = vm_purgable_control(mach_task_self(), |
| 129 memory_.address(), | 129 memory_.address(), |
| 130 VM_PURGABLE_SET_STATE, | 130 VM_PURGABLE_SET_STATE, |
| 131 &state); | 131 &state); |
| 132 MACH_CHECK(ret == KERN_SUCCESS, ret) << "vm_purgable_control"; | 132 MACH_CHECK(ret == KERN_SUCCESS, ret) << "vm_purgable_control"; |
| 133 | 133 |
| 134 #if !defined(NDEBUG) | 134 #if !defined(NDEBUG) |
| 135 ret = vm_protect(mach_task_self(), | 135 ret = vm_protect(mach_task_self(), |
| 136 memory_.address(), | 136 memory_.address(), |
| 137 memory_.size(), | 137 memory_.size(), |
| 138 FALSE, | 138 FALSE, |
| 139 VM_PROT_NONE); | 139 VM_PROT_NONE); |
| 140 MACH_DCHECK(ret == KERN_SUCCESS, ret) << "vm_protect"; | 140 MACH_DCHECK(ret == KERN_SUCCESS, ret) << "vm_protect"; |
| 141 #endif | 141 #endif |
| 142 } | 142 } |
| 143 | 143 |
| 144 virtual void Purge() OVERRIDE { | 144 virtual void Purge() override { |
| 145 memory_.reset(); | 145 memory_.reset(); |
| 146 } | 146 } |
| 147 | 147 |
| 148 private: | 148 private: |
| 149 mac::ScopedMachVM memory_; | 149 mac::ScopedMachVM memory_; |
| 150 const size_t bytes_; | 150 const size_t bytes_; |
| 151 bool is_locked_; | 151 bool is_locked_; |
| 152 | 152 |
| 153 DISALLOW_COPY_AND_ASSIGN(DiscardableMemoryMac); | 153 DISALLOW_COPY_AND_ASSIGN(DiscardableMemoryMac); |
| 154 }; | 154 }; |
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| 208 } | 208 } |
| 209 | 209 |
| 210 // static | 210 // static |
| 211 void DiscardableMemory::PurgeForTesting() { | 211 void DiscardableMemory::PurgeForTesting() { |
| 212 int state = 0; | 212 int state = 0; |
| 213 vm_purgable_control(mach_task_self(), 0, VM_PURGABLE_PURGE_ALL, &state); | 213 vm_purgable_control(mach_task_self(), 0, VM_PURGABLE_PURGE_ALL, &state); |
| 214 internal::DiscardableMemoryEmulated::PurgeForTesting(); | 214 internal::DiscardableMemoryEmulated::PurgeForTesting(); |
| 215 } | 215 } |
| 216 | 216 |
| 217 } // namespace base | 217 } // namespace base |
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