1/*
2 * Copyright (C) 2017 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "GCRequest.h"
28
29namespace JSC {
30
31bool GCRequest::subsumedBy(const GCRequest& other) const
32{
33 // If we have callbacks, then there is no chance that we're subsumed by an existing request.
34 if (didFinishEndPhase)
35 return false;
36
37 if (other.scope == CollectionScope::Full)
38 return true;
39
40 if (scope) {
41 // If we're eden, then we're subsumed by the other scope because the other scope is either eden
42 // or disengaged (so either eden or full). If we're full, then we're not subsumed, for the same
43 // reason.
44 return scope == CollectionScope::Eden;
45 }
46
47 // At this point we know that other.scope is either not engaged or Eden, and this.scope is not
48 // engaged. So, we're expecting to do either an eden or full collection, and the other scope is
49 // either the same or is requesting specifically a full collection. We are subsumed if the other
50 // scope is disengaged (so same as us).
51 return !other.scope;
52}
53
54void GCRequest::dump(PrintStream& out) const
55{
56 out.print("{scope = ", scope, ", didFinishEndPhase = ", didFinishEndPhase ? "engaged" : "null", "}");
57}
58
59} // namespace JSC
60
61