forked from WebKit/WebKit
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathWasmTable.h
More file actions
124 lines (95 loc) · 4.56 KB
/
WasmTable.h
File metadata and controls
124 lines (95 loc) · 4.56 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
/*
* Copyright (C) 2017-2021 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(WEBASSEMBLY)
#include "SlotVisitorMacros.h"
#include "WasmFormat.h"
#include "WasmLimits.h"
#include "WriteBarrier.h"
#include <wtf/MallocPtr.h>
#include <wtf/Ref.h>
#include <wtf/ThreadSafeRefCounted.h>
namespace JSC { namespace Wasm {
class Instance;
class FuncRefTable;
class Table : public ThreadSafeRefCounted<Table> {
WTF_MAKE_NONCOPYABLE(Table);
WTF_MAKE_FAST_ALLOCATED(Table);
public:
static RefPtr<Table> tryCreate(uint32_t initial, std::optional<uint32_t> maximum, TableElementType);
JS_EXPORT_PRIVATE ~Table() = default;
std::optional<uint32_t> maximum() const { return m_maximum; }
uint32_t length() const { return m_length; }
static ptrdiff_t offsetOfLength() { return OBJECT_OFFSETOF(Table, m_length); }
static ptrdiff_t offsetOfMask() { return OBJECT_OFFSETOF(Table, m_mask); }
static uint32_t allocatedLength(uint32_t length);
uint32_t mask() const { return m_mask; }
template<typename T> T* owner() const { return reinterpret_cast<T*>(m_owner); }
void setOwner(JSObject* owner)
{
ASSERT(!m_owner);
ASSERT(owner);
m_owner = owner;
}
TableElementType type() const { return m_type; }
bool isExternrefTable() const { return m_type == TableElementType::Externref; }
bool isFuncrefTable() const { return m_type == TableElementType::Funcref; }
Type wasmType() const;
FuncRefTable* asFuncrefTable();
static bool isValidLength(uint32_t length) { return length < maxTableEntries; }
void clear(uint32_t);
void set(uint32_t, JSValue);
JSValue get(uint32_t) const;
std::optional<uint32_t> grow(uint32_t delta, JSValue defaultValue);
void copy(const Table* srcTable, uint32_t dstIndex, uint32_t srcIndex);
DECLARE_VISIT_AGGREGATE;
protected:
Table(uint32_t initial, std::optional<uint32_t> maximum, TableElementType = TableElementType::Externref);
void setLength(uint32_t);
uint32_t m_length;
uint32_t m_mask;
const TableElementType m_type;
const std::optional<uint32_t> m_maximum;
MallocPtr<WriteBarrier<Unknown>, VMMalloc> m_jsValues;
JSObject* m_owner;
};
class FuncRefTable : public Table {
public:
JS_EXPORT_PRIVATE ~FuncRefTable() = default;
void setFunction(uint32_t, JSObject*, WasmToWasmImportableFunction, Instance*);
const WasmToWasmImportableFunction& function(uint32_t) const;
Instance* instance(uint32_t) const;
void copyFunction(const FuncRefTable* srcTable, uint32_t dstIndex, uint32_t srcIndex);
static ptrdiff_t offsetOfFunctions() { return OBJECT_OFFSETOF(FuncRefTable, m_importableFunctions); }
static ptrdiff_t offsetOfInstances() { return OBJECT_OFFSETOF(FuncRefTable, m_instances); }
private:
FuncRefTable(uint32_t initial, std::optional<uint32_t> maximum);
MallocPtr<WasmToWasmImportableFunction, VMMalloc> m_importableFunctions;
// call_indirect needs to do an Instance check to potentially context switch when calling a function to another instance. We can hold raw pointers to Instance here because the embedder ensures that Table keeps all the instances alive. We couldn't hold a Ref here because it would cause cycles.
MallocPtr<Instance*, VMMalloc> m_instances;
friend class Table;
};
} } // namespace JSC::Wasm
#endif // ENABLE(WEBASSEMBLY)