Ryan Macnak
32a02404c9
With the current block size, this reduces space for forwarding information from two words per moved object to two words per (kObjectAlignment * kBitsPerWord) bytes of heap (1.6% on 64-bit, 3.1% on 32-bit). dart2js compiling dart2js: Compactor/Sweeper Runtime Max RSS Sliding (binary search table) 105 s 1.085 GB Sliding (bitvector) 57.8 s 998.566 MB Evacuating 66.2 s 1.714 GB Concurrent sweep 53.8 s 1.183 GB Blocking sweep 55.0 s 1.181 GB Bug: https://github.com/dart-lang/sdk/issues/30978 Change-Id: Ia6eec4f0162c3959154c5155df24cc06694ecac7 Reviewed-on: https://dart-review.googlesource.com/17721 Reviewed-by: Erik Corry <erikcorry@google.com>
57 lines
1.5 KiB
C++
57 lines
1.5 KiB
C++
// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef RUNTIME_VM_GC_COMPACTOR_H_
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#define RUNTIME_VM_GC_COMPACTOR_H_
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#include "vm/allocation.h"
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#include "vm/dart_api_state.h"
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#include "vm/globals.h"
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#include "vm/visitor.h"
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namespace dart {
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// Forward declarations.
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class FreeList;
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class Heap;
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class HeapPage;
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class RawObject;
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// Implements an evacuating compactor and a sliding compactor.
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class GCCompactor : public ValueObject,
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private HandleVisitor,
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private ObjectPointerVisitor {
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public:
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GCCompactor(Thread* thread, Heap* heap)
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: HandleVisitor(thread),
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ObjectPointerVisitor(thread->isolate()),
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heap_(heap) {}
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~GCCompactor() {}
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void CompactBySliding(HeapPage* pages, FreeList* freelist, Mutex* mutex);
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intptr_t EvacuatePages(HeapPage* page);
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private:
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void SlidePage(HeapPage* page);
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uword SlideBlock(uword first_object, ForwardingPage* forwarding_page);
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void MoveToExactAddress(uword addr);
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void MoveToContiguousSize(intptr_t size);
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void ForwardPointersForSliding();
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void VisitPointers(RawObject** first, RawObject** last);
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void VisitHandle(uword addr);
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Heap* heap_;
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HeapPage* free_page_;
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uword free_current_;
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uword free_end_;
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FreeList* freelist_;
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};
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} // namespace dart
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#endif // RUNTIME_VM_GC_COMPACTOR_H_
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