Ryan Macnak
9d376de55a
Code collection interacts badly with - warming up compiled code - retaining pre-compiled code - code coverage - hot reload (deopting to an old version of a function) Change-Id: Id269a6c3281e577d4f600f0c158af9e62f6b49ea Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/99722 Reviewed-by: Siva Annamalai <asiva@google.com> Commit-Queue: Ryan Macnak <rmacnak@google.com>
84 lines
2.7 KiB
C++
84 lines
2.7 KiB
C++
// Copyright (c) 2011, 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_HEAP_MARKER_H_
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#define RUNTIME_VM_HEAP_MARKER_H_
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#include "vm/allocation.h"
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#include "vm/heap/pointer_block.h"
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#include "vm/os_thread.h" // Mutex.
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namespace dart {
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// Forward declarations.
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class HandleVisitor;
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class Heap;
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class Isolate;
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class ObjectPointerVisitor;
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class PageSpace;
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class RawWeakProperty;
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template <bool sync>
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class MarkingVisitorBase;
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// The class GCMarker is used to mark reachable old generation objects as part
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// of the mark-sweep collection. The marking bit used is defined in RawObject.
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// Instances have a lifetime that spans from the beginining of concurrent
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// marking (or stop-the-world marking) until marking is complete. In particular,
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// an instance may be created and destroyed on different threads if the isolate
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// is exited during concurrent marking.
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class GCMarker {
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public:
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GCMarker(Isolate* isolate, Heap* heap);
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~GCMarker();
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// Mark roots synchronously, then spawn tasks to concurrently drain the
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// marking queue. Only called when no marking or sweeping is in progress.
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// Marking must later be finalized by calling MarkObjects.
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void StartConcurrentMark(PageSpace* page_space);
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// (Re)mark roots, drain the marking queue and finalize weak references.
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// Does not required StartConcurrentMark to have been previously called.
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void MarkObjects(PageSpace* page_space);
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intptr_t marked_words() const { return marked_bytes_ >> kWordSizeLog2; }
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intptr_t MarkedWordsPerMicro() const;
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private:
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void Prologue();
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void Epilogue();
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void ResetRootSlices();
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void IterateRoots(ObjectPointerVisitor* visitor);
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void IterateWeakRoots(HandleVisitor* visitor);
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template <class MarkingVisitorType>
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void IterateWeakReferences(MarkingVisitorType* visitor);
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void ProcessWeakTables(PageSpace* page_space);
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void ProcessObjectIdTable();
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// Called by anyone: finalize and accumulate stats from 'visitor'.
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template <class MarkingVisitorType>
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void FinalizeResultsFrom(MarkingVisitorType* visitor);
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Isolate* const isolate_;
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Heap* const heap_;
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MarkingStack marking_stack_;
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MarkingStack deferred_marking_stack_;
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MarkingVisitorBase<true>** visitors_;
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Monitor root_slices_monitor_;
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intptr_t root_slices_not_started_;
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intptr_t root_slices_not_finished_;
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Mutex stats_mutex_;
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uintptr_t marked_bytes_;
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int64_t marked_micros_;
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friend class ConcurrentMarkTask;
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friend class ParallelMarkTask;
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DISALLOW_IMPLICIT_CONSTRUCTORS(GCMarker);
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};
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} // namespace dart
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#endif // RUNTIME_VM_HEAP_MARKER_H_
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