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
|
// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/runtime/runtime-utils.h"
#include "src/arguments.h"
#include "src/base/platform/time.h"
#include "src/conversions-inl.h"
#include "src/futex-emulation.h"
#include "src/globals.h"
// Implement Futex API for SharedArrayBuffers as defined in the
// SharedArrayBuffer draft spec, found here:
// https://github.com/lars-t-hansen/ecmascript_sharedmem
namespace v8 {
namespace internal {
RUNTIME_FUNCTION(Runtime_AtomicsFutexWait) {
HandleScope scope(isolate);
DCHECK(args.length() == 4);
CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
CONVERT_SIZE_ARG_CHECKED(index, 1);
CONVERT_INT32_ARG_CHECKED(value, 2);
CONVERT_DOUBLE_ARG_CHECKED(timeout, 3);
CHECK(sta->GetBuffer()->is_shared());
CHECK_LT(index, NumberToSize(isolate, sta->length()));
CHECK_EQ(sta->type(), kExternalInt32Array);
CHECK(timeout == V8_INFINITY || !std::isnan(timeout));
Handle<JSArrayBuffer> array_buffer = sta->GetBuffer();
size_t addr = (index << 2) + NumberToSize(isolate, sta->byte_offset());
return FutexEmulation::Wait(isolate, array_buffer, addr, value, timeout);
}
RUNTIME_FUNCTION(Runtime_AtomicsFutexWake) {
HandleScope scope(isolate);
DCHECK(args.length() == 3);
CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
CONVERT_SIZE_ARG_CHECKED(index, 1);
CONVERT_INT32_ARG_CHECKED(count, 2);
CHECK(sta->GetBuffer()->is_shared());
CHECK_LT(index, NumberToSize(isolate, sta->length()));
CHECK_EQ(sta->type(), kExternalInt32Array);
Handle<JSArrayBuffer> array_buffer = sta->GetBuffer();
size_t addr = (index << 2) + NumberToSize(isolate, sta->byte_offset());
return FutexEmulation::Wake(isolate, array_buffer, addr, count);
}
RUNTIME_FUNCTION(Runtime_AtomicsFutexWakeOrRequeue) {
HandleScope scope(isolate);
DCHECK(args.length() == 5);
CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
CONVERT_SIZE_ARG_CHECKED(index1, 1);
CONVERT_INT32_ARG_CHECKED(count, 2);
CONVERT_INT32_ARG_CHECKED(value, 3);
CONVERT_SIZE_ARG_CHECKED(index2, 4);
CHECK(sta->GetBuffer()->is_shared());
CHECK_LT(index1, NumberToSize(isolate, sta->length()));
CHECK_LT(index2, NumberToSize(isolate, sta->length()));
CHECK_EQ(sta->type(), kExternalInt32Array);
Handle<JSArrayBuffer> array_buffer = sta->GetBuffer();
size_t addr1 = (index1 << 2) + NumberToSize(isolate, sta->byte_offset());
size_t addr2 = (index2 << 2) + NumberToSize(isolate, sta->byte_offset());
return FutexEmulation::WakeOrRequeue(isolate, array_buffer, addr1, count,
value, addr2);
}
RUNTIME_FUNCTION(Runtime_AtomicsFutexNumWaitersForTesting) {
HandleScope scope(isolate);
DCHECK(args.length() == 2);
CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
CONVERT_SIZE_ARG_CHECKED(index, 1);
CHECK(sta->GetBuffer()->is_shared());
CHECK_LT(index, NumberToSize(isolate, sta->length()));
CHECK_EQ(sta->type(), kExternalInt32Array);
Handle<JSArrayBuffer> array_buffer = sta->GetBuffer();
size_t addr = (index << 2) + NumberToSize(isolate, sta->byte_offset());
return FutexEmulation::NumWaitersForTesting(isolate, array_buffer, addr);
}
} // namespace internal
} // namespace v8
|
