This repository was archived by the owner on Jun 24, 2022. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 2k
Expand file tree
/
Copy pathReg.h
More file actions
246 lines (196 loc) · 6.18 KB
/
Reg.h
File metadata and controls
246 lines (196 loc) · 6.18 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
/*
* Copyright (C) 2014-2019 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#if ENABLE(ASSEMBLER)
#include "MacroAssembler.h"
namespace JSC {
// Reg is a polymorphic register class. It can refer to either integer or float registers.
// Here are some use cases:
//
// GPRReg gpr;
// Reg reg = gpr;
// reg.isSet() == true
// reg.isGPR() == true
// reg.isFPR() == false
//
// for (Reg reg = Reg::first(); reg <= Reg::last(); reg = reg.next()) {
// if (reg.isGPR()) {
// } else /* reg.isFPR() */ {
// }
// }
//
// The above loop could have also used !!reg or reg.isSet() as a condition.
class Reg {
public:
Reg()
: m_index(invalid())
{
}
Reg(WTF::HashTableDeletedValueType)
: m_index(deleted())
{
}
Reg(MacroAssembler::RegisterID reg)
: m_index(MacroAssembler::registerIndex(reg))
{
}
Reg(MacroAssembler::FPRegisterID reg)
: m_index(MacroAssembler::registerIndex(reg))
{
}
static Reg fromIndex(unsigned index)
{
Reg result;
result.m_index = index;
return result;
}
static Reg first()
{
Reg result;
result.m_index = 0;
return result;
}
static Reg last()
{
Reg result;
result.m_index = MacroAssembler::numberOfRegisters() + MacroAssembler::numberOfFPRegisters() - 1;
return result;
}
Reg next() const
{
ASSERT(!!*this);
if (*this == last())
return Reg();
Reg result;
result.m_index = m_index + 1;
return result;
}
unsigned index() const { return m_index; }
static unsigned maxIndex()
{
return last().index();
}
bool isSet() const { return m_index != invalid(); }
explicit operator bool() const { return isSet(); }
bool isHashTableDeletedValue() const { return m_index == deleted(); }
bool isGPR() const
{
return m_index < MacroAssembler::numberOfRegisters();
}
bool isFPR() const
{
return (m_index - MacroAssembler::numberOfRegisters()) < MacroAssembler::numberOfFPRegisters();
}
MacroAssembler::RegisterID gpr() const
{
ASSERT(isGPR());
return static_cast<MacroAssembler::RegisterID>(MacroAssembler::firstRegister() + m_index);
}
MacroAssembler::FPRegisterID fpr() const
{
ASSERT(isFPR());
return static_cast<MacroAssembler::FPRegisterID>(
MacroAssembler::firstFPRegister() + (m_index - MacroAssembler::numberOfRegisters()));
}
bool operator==(const Reg& other) const
{
return m_index == other.m_index;
}
bool operator!=(const Reg& other) const
{
return m_index != other.m_index;
}
bool operator<(const Reg& other) const
{
return m_index < other.m_index;
}
bool operator>(const Reg& other) const
{
return m_index > other.m_index;
}
bool operator<=(const Reg& other) const
{
return m_index <= other.m_index;
}
bool operator>=(const Reg& other) const
{
return m_index >= other.m_index;
}
unsigned hash() const
{
return m_index;
}
const char* debugName() const;
void dump(PrintStream&) const;
class AllRegsIterable {
public:
class iterator {
public:
iterator() { }
explicit iterator(Reg reg)
: m_regIndex(reg.index())
{
}
Reg operator*() const { return Reg::fromIndex(m_regIndex); }
iterator& operator++()
{
m_regIndex = Reg::fromIndex(m_regIndex).next().index();
return *this;
}
bool operator==(const iterator& other) const
{
return m_regIndex == other.m_regIndex;
}
bool operator!=(const iterator& other) const
{
return !(*this == other);
}
private:
unsigned m_regIndex;
};
iterator begin() const { return iterator(Reg::first()); }
iterator end() const { return iterator(Reg()); }
};
static AllRegsIterable all() { return AllRegsIterable(); }
private:
static uint8_t invalid() { return 0xff; }
static uint8_t deleted() { return 0xfe; }
uint8_t m_index;
};
struct RegHash {
static unsigned hash(const Reg& key) { return key.hash(); }
static bool equal(const Reg& a, const Reg& b) { return a == b; }
static constexpr bool safeToCompareToEmptyOrDeleted = true;
};
} // namespace JSC
namespace WTF {
template<typename T> struct DefaultHash;
template<> struct DefaultHash<JSC::Reg> : JSC::RegHash { };
template<typename T> struct HashTraits;
template<> struct HashTraits<JSC::Reg> : SimpleClassHashTraits<JSC::Reg> {
static constexpr bool emptyValueIsZero = false;
};
} // namespace WTF
#endif // ENABLE(ASSEMBLER)