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
|
/*
* Copyright (C) 2023 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
#include "ArityCheckMode.h"
#include "CallMode.h"
#include "JSCPtrTag.h"
#include <wtf/CodePtr.h>
#include <wtf/SentinelLinkedList.h>
namespace JSC {
class CodeBlock;
class JSCell;
class VM;
class CallSlot {
public:
JSCell* m_calleeOrExecutable { nullptr };
uint32_t m_count { 0 };
uint8_t m_index { 0 };
ArityCheckMode m_arityCheckMode { MustCheckArity };
CodePtr<JSEntryPtrTag> m_target;
CodeBlock* m_codeBlock { nullptr }; // This is weakly held. And cleared whenever m_target is changed.
static constexpr ptrdiff_t offsetOfCalleeOrExecutable() { return OBJECT_OFFSETOF(CallSlot, m_calleeOrExecutable); }
static constexpr ptrdiff_t offsetOfCount() { return OBJECT_OFFSETOF(CallSlot, m_count); }
static constexpr ptrdiff_t offsetOfTarget() { return OBJECT_OFFSETOF(CallSlot, m_target); }
static constexpr ptrdiff_t offsetOfCodeBlock() { return OBJECT_OFFSETOF(CallSlot, m_codeBlock); }
};
static_assert(sizeof(CallSlot) <= 32, "This should be small enough to keep iteration of vector in polymorphic call fast");
class CallLinkInfoBase : public BasicRawSentinelNode<CallLinkInfoBase> {
public:
enum class CallSiteType : uint8_t {
CallLinkInfo,
PolymorphicCallNode,
#if ENABLE(JIT)
DirectCall,
#endif
CachedCall,
};
enum CallType : uint8_t {
None,
Call,
CallVarargs,
Construct,
ConstructVarargs,
TailCall,
TailCallVarargs,
DirectCall,
DirectConstruct,
DirectTailCall
};
enum class UseDataIC : bool { No, Yes };
static CallMode callModeFor(CallType callType)
{
switch (callType) {
case Call:
case CallVarargs:
case DirectCall:
return CallMode::Regular;
case TailCall:
case TailCallVarargs:
case DirectTailCall:
return CallMode::Tail;
case Construct:
case ConstructVarargs:
case DirectConstruct:
return CallMode::Construct;
case None:
RELEASE_ASSERT_NOT_REACHED();
}
RELEASE_ASSERT_NOT_REACHED();
}
explicit CallLinkInfoBase(CallSiteType callSiteType)
: m_callSiteType(callSiteType)
{
}
~CallLinkInfoBase()
{
if (isOnList())
remove();
}
CallSiteType callSiteType() const { return m_callSiteType; }
void unlinkOrUpgrade(VM&, CodeBlock*, CodeBlock*);
private:
CallSiteType m_callSiteType;
};
} // namespace JSC
|
