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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project 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 "src/v8.h" | 5 #include "src/v8.h" |
6 | 6 |
7 #include "src/accessors.h" | 7 #include "src/accessors.h" |
8 #include "src/api.h" | 8 #include "src/api.h" |
9 #include "src/base/once.h" | 9 #include "src/base/once.h" |
10 #include "src/base/utils/random-number-generator.h" | 10 #include "src/base/utils/random-number-generator.h" |
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3314 template | 3314 template |
3315 void Heap::RightTrimFixedArray<Heap::FROM_MUTATOR>(FixedArrayBase*, int); | 3315 void Heap::RightTrimFixedArray<Heap::FROM_MUTATOR>(FixedArrayBase*, int); |
3316 | 3316 |
3317 | 3317 |
3318 template<Heap::InvocationMode mode> | 3318 template<Heap::InvocationMode mode> |
3319 void Heap::RightTrimFixedArray(FixedArrayBase* object, int elements_to_trim) { | 3319 void Heap::RightTrimFixedArray(FixedArrayBase* object, int elements_to_trim) { |
3320 const int element_size = object->IsFixedArray() ? kPointerSize : kDoubleSize; | 3320 const int element_size = object->IsFixedArray() ? kPointerSize : kDoubleSize; |
3321 const int bytes_to_trim = elements_to_trim * element_size; | 3321 const int bytes_to_trim = elements_to_trim * element_size; |
3322 | 3322 |
3323 // For now this trick is only applied to objects in new and paged space. | 3323 // For now this trick is only applied to objects in new and paged space. |
3324 DCHECK(!lo_space()->Contains(object)); | |
3325 DCHECK(object->map() != fixed_cow_array_map()); | 3324 DCHECK(object->map() != fixed_cow_array_map()); |
3326 | 3325 |
3327 const int len = object->length(); | 3326 const int len = object->length(); |
3328 DCHECK(elements_to_trim < len); | 3327 DCHECK(elements_to_trim < len); |
3329 | 3328 |
3330 // Calculate location of new array end. | 3329 // Calculate location of new array end. |
3331 Address new_end = object->address() + object->Size() - bytes_to_trim; | 3330 Address new_end = object->address() + object->Size() - bytes_to_trim; |
3332 | 3331 |
3333 // Technically in new space this write might be omitted (except for | 3332 // Technically in new space this write might be omitted (except for |
3334 // debug mode which iterates through the heap), but to play safer | 3333 // debug mode which iterates through the heap), but to play safer |
3335 // we still do it. | 3334 // we still do it. |
3336 CreateFillerObjectAt(new_end, bytes_to_trim); | 3335 // We do not create a filler for objects in large object space. |
| 3336 // TODO(hpayer): We should shrink the large object page if the size |
| 3337 // of the object changed significantly. |
| 3338 if (!lo_space()->Contains(object)) { |
| 3339 CreateFillerObjectAt(new_end, bytes_to_trim); |
| 3340 } |
3337 | 3341 |
3338 // Initialize header of the trimmed array. We are storing the new length | 3342 // Initialize header of the trimmed array. We are storing the new length |
3339 // using release store after creating a filler for the left-over space to | 3343 // using release store after creating a filler for the left-over space to |
3340 // avoid races with the sweeper thread. | 3344 // avoid races with the sweeper thread. |
3341 object->synchronized_set_length(len - elements_to_trim); | 3345 object->synchronized_set_length(len - elements_to_trim); |
3342 | 3346 |
3343 // Maintain consistency of live bytes during incremental marking | 3347 // Maintain consistency of live bytes during incremental marking |
3344 AdjustLiveBytes(object->address(), -bytes_to_trim, mode); | 3348 AdjustLiveBytes(object->address(), -bytes_to_trim, mode); |
3345 | 3349 |
3346 // Notify the heap profiler of change in object layout. The array may not be | 3350 // Notify the heap profiler of change in object layout. The array may not be |
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6143 static_cast<int>(object_sizes_last_time_[index])); | 6147 static_cast<int>(object_sizes_last_time_[index])); |
6144 CODE_AGE_LIST_COMPLETE(ADJUST_LAST_TIME_OBJECT_COUNT) | 6148 CODE_AGE_LIST_COMPLETE(ADJUST_LAST_TIME_OBJECT_COUNT) |
6145 #undef ADJUST_LAST_TIME_OBJECT_COUNT | 6149 #undef ADJUST_LAST_TIME_OBJECT_COUNT |
6146 | 6150 |
6147 MemCopy(object_counts_last_time_, object_counts_, sizeof(object_counts_)); | 6151 MemCopy(object_counts_last_time_, object_counts_, sizeof(object_counts_)); |
6148 MemCopy(object_sizes_last_time_, object_sizes_, sizeof(object_sizes_)); | 6152 MemCopy(object_sizes_last_time_, object_sizes_, sizeof(object_sizes_)); |
6149 ClearObjectStats(); | 6153 ClearObjectStats(); |
6150 } | 6154 } |
6151 } | 6155 } |
6152 } // namespace v8::internal | 6156 } // namespace v8::internal |
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