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
158
159
|
// 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/common/assert-scope.h"
#include "src/common/globals.h"
#include "src/handles/handles-inl.h"
#include "src/handles/local-handles-inl.h"
#include "src/handles/local-handles.h"
#include "src/heap/heap.h"
#include "src/heap/local-heap.h"
#include "src/heap/parked-scope.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 {
namespace {
class LocalHandlesThread final : public v8::base::Thread {
public:
LocalHandlesThread(Heap* heap, Address object, base::Semaphore* sema_started,
base::Semaphore* sema_gc_finished)
: v8::base::Thread(base::Thread::Options("ThreadWithLocalHeap")),
heap_(heap),
object_(object),
sema_started_(sema_started),
sema_gc_finished_(sema_gc_finished) {}
void Run() override {
LocalHeap local_heap(heap_, ThreadKind::kBackground);
UnparkedScope unparked_scope(&local_heap);
LocalHandleScope scope(&local_heap);
static constexpr int kNumHandles =
kHandleBlockSize * 2 + kHandleBlockSize / 2;
std::vector<Handle<HeapNumber>> handles;
handles.reserve(kNumHandles);
for (int i = 0; i < kNumHandles; i++) {
Handle<HeapNumber> number = handle(
HeapNumber::cast(HeapObject::FromAddress(object_)), &local_heap);
handles.push_back(number);
}
sema_started_->Signal();
{
ParkedScope scope(&local_heap);
sema_gc_finished_->Wait();
}
for (Handle<HeapNumber> handle : handles) {
CHECK_EQ(42.0, handle->value());
}
}
Heap* heap_;
Address object_;
base::Semaphore* sema_started_;
base::Semaphore* sema_gc_finished_;
};
TEST(CreateLocalHandles) {
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
Address object = kNullAddress;
{
HandleScope handle_scope(isolate);
Handle<HeapNumber> number = isolate->factory()->NewHeapNumber(42.0);
object = (*number).address();
}
base::Semaphore sema_started(0);
base::Semaphore sema_gc_finished(0);
std::unique_ptr<LocalHandlesThread> thread(new LocalHandlesThread(
isolate->heap(), object, &sema_started, &sema_gc_finished));
CHECK(thread->Start());
sema_started.Wait();
CcTest::CollectAllGarbage();
sema_gc_finished.Signal();
thread->Join();
}
TEST(CreateLocalHandlesWithoutLocalHandleScope) {
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
HandleScope handle_scope(isolate);
handle(Smi::FromInt(17), isolate->main_thread_local_heap());
}
TEST(DereferenceLocalHandle) {
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
// Create a PersistentHandle to create the LocalHandle, and thus not have a
// HandleScope present to override the LocalHandleScope.
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(), ThreadKind::kBackground,
std::move(phs));
UnparkedScope unparked_scope(&local_heap);
LocalHandleScope scope(&local_heap);
Handle<HeapNumber> local_number = handle(*ph, &local_heap);
CHECK_EQ(42, local_number->value());
}
}
TEST(DereferenceLocalHandleFailsWhenDisallowed) {
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
// Create a PersistentHandle to create the LocalHandle, and thus not have a
// HandleScope present to override the LocalHandleScope.
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(), ThreadKind::kBackground,
std::move(phs));
UnparkedScope unparked_scope(&local_heap);
LocalHandleScope scope(&local_heap);
Handle<HeapNumber> local_number = handle(*ph, &local_heap);
DisallowHandleDereference disallow_scope;
CHECK_EQ(42, local_number->value());
}
}
} // anonymous namespace
} // namespace internal
} // namespace v8
|
