1/*
2 * Copyright (C) 2019 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 "VirtualRegister.h"
29#include <wtf/PrintStream.h>
30
31namespace JSC {
32
33class SymbolTableOrScopeDepth {
34public:
35 SymbolTableOrScopeDepth() = default;
36
37 static SymbolTableOrScopeDepth symbolTable(VirtualRegister reg)
38 {
39 ASSERT(reg.isConstant());
40 return SymbolTableOrScopeDepth(reg.offset() - FirstConstantRegisterIndex);
41 }
42
43 static SymbolTableOrScopeDepth scopeDepth(unsigned scopeDepth)
44 {
45 return SymbolTableOrScopeDepth(scopeDepth);
46 }
47
48 static SymbolTableOrScopeDepth raw(unsigned value)
49 {
50 return SymbolTableOrScopeDepth(value);
51 }
52
53 VirtualRegister symbolTable() const
54 {
55 return VirtualRegister(m_raw + FirstConstantRegisterIndex);
56 }
57
58 unsigned scopeDepth() const
59 {
60 return m_raw;
61 }
62
63 unsigned raw() const { return m_raw; }
64
65 void dump(PrintStream& out) const
66 {
67 out.print(m_raw);
68 }
69
70private:
71 SymbolTableOrScopeDepth(unsigned value)
72 : m_raw(value)
73 { }
74
75 unsigned m_raw { 0 };
76};
77
78} // namespace JSC
79