1/*
2 * Copyright (C) 2018 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#pragma once
27
28#include "ExitFlag.h"
29
30namespace JSC {
31
32class CodeBlock;
33class StructureSet;
34
35template<typename VariantVectorType, typename VariantType>
36bool appendICStatusVariant(VariantVectorType& variants, const VariantType& variant)
37{
38 // Attempt to merge this variant with an already existing variant.
39 for (unsigned i = 0; i < variants.size(); ++i) {
40 VariantType& mergedVariant = variants[i];
41 if (mergedVariant.attemptToMerge(variant)) {
42 for (unsigned j = 0; j < variants.size(); ++j) {
43 if (i == j)
44 continue;
45 if (variants[j].structureSet().overlaps(mergedVariant.structureSet()))
46 return false;
47 }
48 return true;
49 }
50 }
51
52 // Make sure there is no overlap. We should have pruned out opportunities for
53 // overlap but it's possible that an inline cache got into a weird state. We are
54 // defensive and bail if we detect crazy.
55 for (unsigned i = 0; i < variants.size(); ++i) {
56 if (variants[i].structureSet().overlaps(variant.structureSet()))
57 return false;
58 }
59
60 variants.append(variant);
61 return true;
62}
63
64template<typename VariantVectorType>
65void filterICStatusVariants(VariantVectorType& variants, const StructureSet& set)
66{
67 variants.removeAllMatching(
68 [&] (auto& variant) -> bool {
69 variant.structureSet().filter(set);
70 return variant.structureSet().isEmpty();
71 });
72}
73
74ExitFlag hasBadCacheExitSite(CodeBlock* profiledBlock, unsigned bytecodeIndex);
75
76} // namespace JSC
77
78