1/*
2 * Copyright (C) 2012 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 "IndexingType.h"
28
29#include <wtf/StringExtras.h>
30
31namespace JSC {
32
33IndexingType leastUpperBoundOfIndexingTypes(IndexingType a, IndexingType b)
34{
35    // It doesn't make sense to LUB something that is an array with something that isn't.
36    ASSERT((a & IsArray) == (b & IsArray));
37
38    // Boy, this sure is easy right now.
39    return std::max(a, b);
40}
41
42IndexingType leastUpperBoundOfIndexingTypeAndType(IndexingType indexingType, SpeculatedType type)
43{
44    if (!type)
45        return indexingType;
46    switch (indexingType) {
47    case ALL_BLANK_INDEXING_TYPES:
48    case ALL_UNDECIDED_INDEXING_TYPES:
49    case ALL_INT32_INDEXING_TYPES:
50        if (isInt32Speculation(type))
51            return (indexingType & ~IndexingShapeMask) | Int32Shape;
52        if (isFullNumberSpeculation(type))
53            return (indexingType & ~IndexingShapeMask) | DoubleShape;
54        return (indexingType & ~IndexingShapeMask) | ContiguousShape;
55    case ALL_DOUBLE_INDEXING_TYPES:
56        if (isFullNumberSpeculation(type))
57            return indexingType;
58        return (indexingType & ~IndexingShapeMask) | ContiguousShape;
59    case ALL_CONTIGUOUS_INDEXING_TYPES:
60    case ALL_ARRAY_STORAGE_INDEXING_TYPES:
61        return indexingType;
62    default:
63        CRASH();
64        return 0;
65    }
66}
67
68IndexingType leastUpperBoundOfIndexingTypeAndValue(IndexingType indexingType, JSValue value)
69{
70    return leastUpperBoundOfIndexingTypeAndType(indexingType, speculationFromValue(value));
71}
72
73void dumpIndexingType(PrintStream& out, IndexingType indexingType)
74{
75    const char* basicName;
76    switch (indexingType & AllArrayTypes) {
77    case NonArray:
78        basicName = "NonArray";
79        break;
80    case NonArrayWithInt32:
81        basicName = "NonArrayWithInt32";
82        break;
83    case NonArrayWithDouble:
84        basicName = "NonArrayWithDouble";
85        break;
86    case NonArrayWithContiguous:
87        basicName = "NonArrayWithContiguous";
88        break;
89    case NonArrayWithArrayStorage:
90        basicName = "NonArrayWithArrayStorage";
91        break;
92    case NonArrayWithSlowPutArrayStorage:
93        basicName = "NonArrayWithSlowPutArrayStorage";
94        break;
95    case ArrayClass:
96        basicName = "ArrayClass";
97        break;
98    case ArrayWithUndecided:
99        basicName = "ArrayWithUndecided";
100        break;
101    case ArrayWithInt32:
102        basicName = "ArrayWithInt32";
103        break;
104    case ArrayWithDouble:
105        basicName = "ArrayWithDouble";
106        break;
107    case ArrayWithContiguous:
108        basicName = "ArrayWithContiguous";
109        break;
110    case ArrayWithArrayStorage:
111        basicName = "ArrayWithArrayStorage";
112        break;
113    case ArrayWithSlowPutArrayStorage:
114        basicName = "ArrayWithSlowPutArrayStorage";
115        break;
116    default:
117        basicName = "Unknown!";
118        break;
119    }
120
121    out.printf("%s%s", basicName, (indexingType & MayHaveIndexedAccessors) ? "|MayHaveIndexedAccessors" : "");
122}
123
124} // namespace JSC
125
126