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
|
/*
* Copyright (C) 2017-2023 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 <wtf/Platform.h>
#if ENABLE(WEBASSEMBLY)
#include <JavaScriptCore/SlotVisitorMacros.h>
#include <JavaScriptCore/WasmFormat.h>
#include <JavaScriptCore/WasmLimits.h>
#include <JavaScriptCore/WriteBarrier.h>
#include <wtf/Ref.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/ThreadSafeRefCounted.h>
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC {
class JSWebAssemblyGlobal;
namespace Wasm {
class Global final : public ThreadSafeRefCounted<Global> {
WTF_MAKE_NONCOPYABLE(Global);
WTF_MAKE_TZONE_ALLOCATED(Global);
public:
union Value {
v128_t m_vector { };
uint64_t m_primitive;
WriteBarrierBase<Unknown> m_externref;
Value* m_pointer;
static constexpr ptrdiff_t offsetOfValue() { return 0; }
static constexpr ptrdiff_t offsetOfOwner() { return Global::offsetOfOwner() - Global::offsetOfValue(); }
};
static_assert(sizeof(Value) == 16, "Update IPInt if this changes");
static Ref<Global> create(Wasm::Type type, Wasm::Mutability mutability, uint64_t initialValue = 0)
{
return adoptRef(*new Global(type, mutability, initialValue));
}
static Ref<Global> create(Wasm::Type type, Wasm::Mutability mutability, v128_t initialValue)
{
return adoptRef(*new Global(type, mutability, initialValue));
}
Wasm::Type type() const { return m_type; }
Wasm::Mutability mutability() const { return m_mutability; }
JSValue get(JSGlobalObject*) const;
uint64_t getPrimitive() const { return m_value.m_primitive; }
v128_t getVector() const { return m_value.m_vector; }
void set(JSGlobalObject*, JSValue);
DECLARE_VISIT_AGGREGATE;
JSWebAssemblyGlobal* owner() const { return m_owner; }
void setOwner(JSWebAssemblyGlobal* owner)
{
ASSERT(!m_owner);
ASSERT(owner);
m_owner = owner;
}
static constexpr ptrdiff_t offsetOfValue() { ASSERT(!OBJECT_OFFSETOF(Value, m_primitive)); ASSERT(!OBJECT_OFFSETOF(Value, m_externref)); return OBJECT_OFFSETOF(Global, m_value); }
static constexpr ptrdiff_t offsetOfOwner() { return OBJECT_OFFSETOF(Global, m_owner); }
static Global& fromBinding(Value& value)
{
return *std::bit_cast<Global*>(std::bit_cast<uint8_t*>(&value) - offsetOfValue());
}
Value* valuePointer() { return &m_value; }
private:
Global(Wasm::Type type, Wasm::Mutability mutability, uint64_t initialValue)
: m_type(type)
, m_typeDefinition(TypeInformation::getRef(type.index))
, m_mutability(mutability)
{
ASSERT(m_type != Types::V128);
m_value.m_primitive = initialValue;
}
Global(Wasm::Type type, Wasm::Mutability mutability, v128_t initialValue)
: m_type(type)
, m_typeDefinition(TypeInformation::getRef(type.index))
, m_mutability(mutability)
{
ASSERT(m_type == Types::V128);
m_value.m_vector = initialValue;
}
Wasm::Type m_type;
// If m_type came from a TypeDefinition, the following retains the definition to prevent a dangling m_type.
RefPtr<const Wasm::TypeDefinition> m_typeDefinition;
Wasm::Mutability m_mutability;
JSWebAssemblyGlobal* m_owner { nullptr };
Value m_value;
};
} } // namespace JSC::Wasm
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
#endif // ENABLE(WEBASSEMBLY)
|
