Ryan Macnak
62ae8cda0a
Divide the heap by pages into k tasks. Use ThreadBarrier to ensure planning -> sliding and non-stack forwarding -> stack forwarding. Bug: https://github.com/dart-lang/sdk/issues/30978 Change-Id: I2c9fcec0a0794bfea96ca1a0fb509a9f93242b65 Reviewed-on: https://dart-review.googlesource.com/29444 Commit-Queue: Ryan Macnak <rmacnak@google.com> Reviewed-by: Erik Corry <erikcorry@google.com>
56 lines
1.4 KiB
C++
56 lines
1.4 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 a sliding compactor.
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class GCCompactor : public ValueObject,
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public HandleVisitor,
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public 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 Compact(HeapPage* pages, FreeList* freelist, Mutex* mutex);
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private:
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void SetupImagePageBoundaries();
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void ForwardStackPointers();
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void ForwardPointer(RawObject** ptr);
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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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struct ImagePageRange {
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uword base;
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uword size;
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};
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// There are up to 4 images to consider:
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// {instructions, data} x {vm isolate, current isolate}
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static const intptr_t kMaxImagePages = 4;
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ImagePageRange image_page_ranges_[kMaxImagePages];
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};
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} // namespace dart
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#endif // RUNTIME_VM_GC_COMPACTOR_H_
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