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
|
// Copyright 2020 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 <memory>
#include "src/api/api.h"
#include "src/base/platform/condition-variable.h"
#include "src/base/platform/mutex.h"
#include "src/base/platform/semaphore.h"
#include "src/handles/handles-inl.h"
#include "src/handles/local-handles-inl.h"
#include "src/handles/persistent-handles.h"
#include "src/heap/heap.h"
#include "src/heap/local-heap-inl.h"
#include "src/heap/local-heap.h"
#include "src/heap/safepoint.h"
#include "src/objects/heap-number.h"
#include "test/cctest/cctest.h"
#include "test/cctest/heap/heap-utils.h"
namespace v8 {
namespace internal {
static constexpr int kNumHandles = kHandleBlockSize * 2 + kHandleBlockSize / 2;
namespace {
class PersistentHandlesThread final : public v8::base::Thread {
public:
PersistentHandlesThread(Heap* heap, std::vector<Handle<HeapNumber>> handles,
std::unique_ptr<PersistentHandles> ph,
HeapNumber number, base::Semaphore* sema_started,
base::Semaphore* sema_gc_finished)
: v8::base::Thread(base::Thread::Options("ThreadWithLocalHeap")),
heap_(heap),
handles_(std::move(handles)),
ph_(std::move(ph)),
number_(number),
sema_started_(sema_started),
sema_gc_finished_(sema_gc_finished) {}
void Run() override {
LocalHeap local_heap(heap_, std::move(ph_));
LocalHandleScope scope(&local_heap);
for (int i = 0; i < kNumHandles; i++) {
handles_.push_back(local_heap.NewPersistentHandle(number_));
}
sema_started_->Signal();
{
ParkedScope scope(&local_heap);
sema_gc_finished_->Wait();
}
for (Handle<HeapNumber> handle : handles_) {
CHECK_EQ(42.0, handle->value());
}
CHECK_EQ(handles_.size(), kNumHandles * 2);
CHECK(!ph_);
ph_ = local_heap.DetachPersistentHandles();
}
Heap* heap_;
std::vector<Handle<HeapNumber>> handles_;
std::unique_ptr<PersistentHandles> ph_;
HeapNumber number_;
base::Semaphore* sema_started_;
base::Semaphore* sema_gc_finished_;
};
TEST(CreatePersistentHandles) {
heap::EnsureFlagLocalHeapsEnabled();
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
std::unique_ptr<PersistentHandles> ph = isolate->NewPersistentHandles();
std::vector<Handle<HeapNumber>> handles;
HandleScope handle_scope(isolate);
Handle<HeapNumber> number = isolate->factory()->NewHeapNumber(42.0);
for (int i = 0; i < kNumHandles; i++) {
handles.push_back(ph->NewHandle(number));
}
base::Semaphore sema_started(0);
base::Semaphore sema_gc_finished(0);
// pass persistent handles to background thread
std::unique_ptr<PersistentHandlesThread> thread(new PersistentHandlesThread(
isolate->heap(), std::move(handles), std::move(ph), *number,
&sema_started, &sema_gc_finished));
CHECK(thread->Start());
sema_started.Wait();
CcTest::CollectAllGarbage();
sema_gc_finished.Signal();
thread->Join();
// get persistent handles back to main thread
ph = std::move(thread->ph_);
ph->NewHandle(number);
}
TEST(DereferencePersistentHandle) {
heap::EnsureFlagLocalHeapsEnabled();
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
std::unique_ptr<PersistentHandles> phs = isolate->NewPersistentHandles();
Handle<HeapNumber> ph;
{
HandleScope handle_scope(isolate);
Handle<HeapNumber> number = isolate->factory()->NewHeapNumber(42.0);
ph = phs->NewHandle(number);
}
{
LocalHeap local_heap(isolate->heap(), std::move(phs));
CHECK_EQ(42, ph->value());
DisallowHandleDereference disallow_scope;
CHECK_EQ(42, ph->value());
}
}
TEST(NewPersistentHandleFailsWhenParked) {
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
LocalHeap local_heap(isolate->heap());
ParkedScope scope(&local_heap);
// Fail here in debug mode: Persistent handles can't be created if local heap
// is parked
local_heap.NewPersistentHandle(Smi::FromInt(1));
}
TEST(NewPersistentHandleFailsWhenParkedExplicit) {
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
LocalHeap local_heap(isolate->heap(), isolate->NewPersistentHandles());
ParkedScope scope(&local_heap);
// Fail here in debug mode: Persistent handles can't be created if local heap
// is parked
local_heap.NewPersistentHandle(Smi::FromInt(1));
}
} // anonymous namespace
} // namespace internal
} // namespace v8
|
