mirror of
https://github.com/dart-lang/sdk
synced 2024-11-02 12:24:24 +00:00
e4d01aa323
This was a temporary measure to verify the VM could handle moving old-space objects before we had the sliding compactor. Bug: https://github.com/dart-lang/sdk/issues/30978 Change-Id: I4ffec413918481c0af4828d126930455f620935d Reviewed-on: https://dart-review.googlesource.com/22663 Reviewed-by: Siva Annamalai <asiva@google.com> Reviewed-by: Erik Corry <erikcorry@google.com>
64 lines
1.7 KiB
C++
64 lines
1.7 KiB
C++
// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
|
|
// for details. All rights reserved. Use of this source code is governed by a
|
|
// BSD-style license that can be found in the LICENSE file.
|
|
|
|
#ifndef RUNTIME_VM_GC_COMPACTOR_H_
|
|
#define RUNTIME_VM_GC_COMPACTOR_H_
|
|
|
|
#include "vm/allocation.h"
|
|
#include "vm/dart_api_state.h"
|
|
#include "vm/globals.h"
|
|
#include "vm/visitor.h"
|
|
|
|
namespace dart {
|
|
|
|
// Forward declarations.
|
|
class FreeList;
|
|
class Heap;
|
|
class HeapPage;
|
|
class RawObject;
|
|
|
|
// Implements a sliding compactor.
|
|
class GCCompactor : public ValueObject,
|
|
private HandleVisitor,
|
|
private ObjectPointerVisitor {
|
|
public:
|
|
GCCompactor(Thread* thread, Heap* heap)
|
|
: HandleVisitor(thread),
|
|
ObjectPointerVisitor(thread->isolate()),
|
|
heap_(heap) {}
|
|
~GCCompactor() {}
|
|
|
|
void CompactBySliding(HeapPage* pages, FreeList* freelist, Mutex* mutex);
|
|
|
|
private:
|
|
void SlidePage(HeapPage* page);
|
|
uword SlideBlock(uword first_object, ForwardingPage* forwarding_page);
|
|
void MoveToExactAddress(uword addr);
|
|
void MoveToContiguousSize(intptr_t size);
|
|
|
|
void ForwardPointersForSliding();
|
|
void ForwardPointerForSliding(RawObject** ptr);
|
|
void VisitPointers(RawObject** first, RawObject** last);
|
|
void VisitHandle(uword addr);
|
|
|
|
Heap* heap_;
|
|
|
|
HeapPage* free_page_;
|
|
uword free_current_;
|
|
uword free_end_;
|
|
FreeList* freelist_;
|
|
|
|
struct ImagePageRange {
|
|
uword base;
|
|
uword size;
|
|
};
|
|
// There are up to 4 images to consider:
|
|
// {instructions, data} x {vm isolate, current isolate}
|
|
static const intptr_t kMaxImagePages = 4;
|
|
ImagePageRange image_page_ranges_[kMaxImagePages];
|
|
};
|
|
|
|
} // namespace dart
|
|
|
|
#endif // RUNTIME_VM_GC_COMPACTOR_H_
|