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
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sts=4 et sw=4 tw=99:
*/
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "gc/GCInternals.h"
#include "gc/Zone.h"
#include "js/GCVector.h"
#include "jsapi-tests/tests.h"
static void
MinimizeHeap(JSContext* cx)
{
// The second collection is to force us to wait for the background
// sweeping that the first GC started to finish.
JS_GC(cx);
JS_GC(cx);
js::gc::FinishGC(cx);
}
BEGIN_TEST(testGCUID)
{
uint64_t uid = 0;
uint64_t tmp = 0;
// Ensure the heap is as minimal as it can get.
MinimizeHeap(cx);
JS::RootedObject obj(cx, JS_NewPlainObject(cx));
uintptr_t nurseryAddr = uintptr_t(obj.get());
CHECK(obj);
CHECK(js::gc::IsInsideNursery(obj));
// Do not start with an ID.
CHECK(!obj->zone()->hasUniqueId(obj));
// Ensure we can get a new UID.
CHECK(obj->zone()->getUniqueId(obj, &uid));
CHECK(uid > js::gc::LargestTaggedNullCellPointer);
// We should now have an id.
CHECK(obj->zone()->hasUniqueId(obj));
// Calling again should get us the same thing.
CHECK(obj->zone()->getUniqueId(obj, &tmp));
CHECK(uid == tmp);
// Tenure the thing and check that the UID moved with it.
MinimizeHeap(cx);
uintptr_t tenuredAddr = uintptr_t(obj.get());
CHECK(tenuredAddr != nurseryAddr);
CHECK(!js::gc::IsInsideNursery(obj));
CHECK(obj->zone()->hasUniqueId(obj));
CHECK(obj->zone()->getUniqueId(obj, &tmp));
CHECK(uid == tmp);
// Allocate a new nursery thing in the same location and check that we
// removed the prior uid that was attached to the location.
obj = JS_NewPlainObject(cx);
CHECK(obj);
CHECK(uintptr_t(obj.get()) == nurseryAddr);
CHECK(!obj->zone()->hasUniqueId(obj));
// Try to get another tenured object in the same location and check that
// the uid was removed correctly.
obj = nullptr;
MinimizeHeap(cx);
obj = JS_NewPlainObject(cx);
MinimizeHeap(cx);
CHECK(uintptr_t(obj.get()) == tenuredAddr);
CHECK(!obj->zone()->hasUniqueId(obj));
CHECK(obj->zone()->getUniqueId(obj, &tmp));
CHECK(uid != tmp);
uid = tmp;
// Allocate a few arenas worth of objects to ensure we get some compaction.
const static size_t N = 2049;
using ObjectVector = JS::GCVector<JSObject*>;
JS::Rooted<ObjectVector> vec(cx, ObjectVector(cx));
for (size_t i = 0; i < N; ++i) {
obj = JS_NewPlainObject(cx);
CHECK(obj);
CHECK(vec.append(obj));
}
// Transfer our vector to tenured if it isn't there already.
MinimizeHeap(cx);
// Tear holes in the heap by unrooting the even objects and collecting.
JS::Rooted<ObjectVector> vec2(cx, ObjectVector(cx));
for (size_t i = 0; i < N; ++i) {
if (i % 2 == 1)
vec2.append(vec[i]);
}
vec.clear();
MinimizeHeap(cx);
// Grab the last object in the vector as our object of interest.
obj = vec2.back();
CHECK(obj);
tenuredAddr = uintptr_t(obj.get());
CHECK(obj->zone()->getUniqueId(obj, &uid));
// Force a compaction to move the object and check that the uid moved to
// the new tenured heap location.
JS::PrepareForFullGC(cx);
JS::GCForReason(cx, GC_SHRINK, JS::gcreason::API);
MinimizeHeap(cx);
CHECK(uintptr_t(obj.get()) != tenuredAddr);
CHECK(obj->zone()->hasUniqueId(obj));
CHECK(obj->zone()->getUniqueId(obj, &tmp));
CHECK(uid == tmp);
return true;
}
END_TEST(testGCUID)
|
