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
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
package scala.lang.primitives
import org.junit.Assert._
import org.junit.Test
import org.junit.runner.RunWith
import org.junit.runners.JUnit4
import scala.tools.testing.RunTesting
object BoxUnboxTest {
class VCI(val x: Int) extends AnyVal { override def toString = "" + x }
}
@RunWith(classOf[JUnit4])
class BoxUnboxTest extends RunTesting {
import runner._
@Test
def boxUnboxInt(): Unit = {
import scala.tools.testing.AssertUtil._
import org.junit.Assert._
def genericNull[T] = null.asInstanceOf[T] // allowed, see SI-4437, point 2
val b = new Integer(1)
val u = 1
assertEquals(1.toInt, u)
assertEquals(Predef.int2Integer(1), b)
assertEquals(1: Integer, b)
assertEquals(Int.box(1), b)
assertEquals(1.asInstanceOf[Object], b)
assertThrows[ClassCastException]("".asInstanceOf[Integer])
assertEquals(Predef.Integer2int(b), u)
assertEquals(b: Int, u)
assertEquals(Int.unbox(b), u)
assertEquals(b.asInstanceOf[Int], u)
assertEquals(b.intValue, u)
assertEquals(b.toInt, u)
intWrapper(b).toInt
assertThrows[ClassCastException](Int.unbox(""))
assertThrows[ClassCastException]("".asInstanceOf[Int])
// null unboxing in various positions
val n1 = Int.unbox(null)
assertEquals(n1, 0)
val n2 = Predef.Integer2int(null)
assertEquals(n2, 0)
val n3 = (null: Integer): Int
assertEquals(n3, 0)
val n4 = null.asInstanceOf[Int]
assertEquals(n4, 0)
val n5 = null.asInstanceOf[Int] == 0
assertTrue(n5)
val n6 = null.asInstanceOf[Int] == null
assertFalse(n6)
val n7 = null.asInstanceOf[Int] != 0
assertFalse(n7)
val n8 = null.asInstanceOf[Int] != null
assertTrue(n8)
val mp = new java.util.HashMap[Int, Int]
val n9 = mp.get(0)
assertEquals(n9, 0)
val n10 = mp.get(0) == null // SI-602
assertThrows[AssertionError](assertFalse(n10)) // should not throw
def f(a: Any) = "" + a
val n11 = f(null.asInstanceOf[Int])
assertEquals(n11, "0")
def n12 = genericNull[Int]
assertEquals(n12, 0)
}
@Test
def numericConversions(): Unit = {
import scala.tools.testing.AssertUtil._
import org.junit.Assert._
val i1 = 1L.asInstanceOf[Int]
assertEquals(i1, 1)
assertThrows[ClassCastException] {
val i2 = (1L: Any).asInstanceOf[Int] // SI-1448, should not throw. see also SI-4437 point 1.
assertEquals(i2, 1)
}
}
@Test
def boxUnboxBoolean(): Unit = {
val n1 = Option(null.asInstanceOf[Boolean])
assertEquals(n1, Some(false))
}
@Test
def boxUnboxUnit(): Unit = {
// should not use assertEquals in this test: it takes two Object parameters. normally, Unit does
// not conform to Object, but for Java-defined methods scalac makes an exception and treats them
// as Any. passing a Unit as Any makes the compiler go through another layer of boxing, so it
// can hide some bugs (where we actually have a null, but the compiler makes it a ()).
import scala.tools.testing.AssertUtil._
import org.junit.Assert._
var v = 0
def eff() = { v = 1 }
def chk() = { assert(v == 1); v = 0 }
val b = runtime.BoxedUnit.UNIT
assert(eff() == b); chk()
assert(Unit.box(eff()) == b); chk()
assert(().asInstanceOf[Object] == b)
Unit.unbox({eff(); b}); chk()
Unit.unbox({eff(); null}); chk()
assertThrows[ClassCastException](Unit.unbox({eff(); ""})); chk()
val n1 = null.asInstanceOf[Unit]
assert(n1 == b)
val n2 = null.asInstanceOf[Unit] == b
assert(n2)
def f(a: Any) = "" + a
val n3 = f(null.asInstanceOf[Unit])
assertEquals(n3, "()")
}
@Test
def t9671(): Unit = {
import scala.lang.primitives.BoxUnboxTest.VCI
def f1(a: Any) = "" + a
def f2(a: AnyVal) = "" + a
def f3[T](a: T) = "" + a
def f4(a: Int) = "" + a
def f5(a: VCI) = "" + a
def f6(u: Unit) = "" + u
def n1: AnyRef = null
def n2: Null = null
def n3: Any = null
def n4[T]: T = null.asInstanceOf[T]
def npe(s: => String) = try { s; throw new Error() } catch { case _: NullPointerException => "npe" }
val result =
f1(null.asInstanceOf[Int]) +
f1( n1.asInstanceOf[Int]) +
f1( n2.asInstanceOf[Int]) +
f1( n3.asInstanceOf[Int]) +
f1( n4[Int]) + // "null"
"-" +
f1(null.asInstanceOf[VCI]) +
npe(f1( n1.asInstanceOf[VCI])) + // SI-8097
f1( n2.asInstanceOf[VCI]) +
npe(f1( n3.asInstanceOf[VCI])) + // SI-8097
f1( n4[VCI]) + // "null"
"-" +
f1(null.asInstanceOf[Unit]) +
f1( n1.asInstanceOf[Unit]) +
f1( n2.asInstanceOf[Unit]) +
f1( n3.asInstanceOf[Unit]) +
f1( n4[Unit]) + // "null"
"-" +
f2(null.asInstanceOf[Int]) +
f2( n1.asInstanceOf[Int]) +
f2( n2.asInstanceOf[Int]) +
f2( n3.asInstanceOf[Int]) +
f2( n4[Int]) + // "null"
"-" +
f2(null.asInstanceOf[VCI]) +
npe(f2( n1.asInstanceOf[VCI])) + // SI-8097
f2( n2.asInstanceOf[VCI]) +
npe(f2( n3.asInstanceOf[VCI])) + // SI-8097
f2( n4[VCI]) + // "null"
"-" +
f2(null.asInstanceOf[Unit]) +
f2( n1.asInstanceOf[Unit]) +
f2( n2.asInstanceOf[Unit]) +
f2( n3.asInstanceOf[Unit]) +
f2( n4[Unit]) + // "null"
"-" +
f3(null.asInstanceOf[Int]) +
f3( n1.asInstanceOf[Int]) +
f3( n2.asInstanceOf[Int]) +
f3( n3.asInstanceOf[Int]) +
f3( n4[Int]) + // "null"
"-" +
f3(null.asInstanceOf[VCI]) +
npe(f3( n1.asInstanceOf[VCI])) + // SI-8097
f3( n2.asInstanceOf[VCI]) +
npe(f3( n3.asInstanceOf[VCI])) + // SI-8097
f3( n4[VCI]) + // "null"
"-" +
f3(null.asInstanceOf[Unit]) +
f3( n1.asInstanceOf[Unit]) +
f3( n2.asInstanceOf[Unit]) +
f3( n3.asInstanceOf[Unit]) +
f3( n4[Unit]) + // "null"
"-" +
f4(null.asInstanceOf[Int]) +
f4( n1.asInstanceOf[Int]) +
f4( n2.asInstanceOf[Int]) +
f4( n3.asInstanceOf[Int]) +
f4( n4[Int]) +
"-" +
f5(null.asInstanceOf[VCI]) +
npe(f5( n1.asInstanceOf[VCI])) + // SI-8097
f5( n2.asInstanceOf[VCI]) +
npe(f5( n3.asInstanceOf[VCI])) + // SI-8097
npe(f5( n4[VCI])) + // SI-8097
"-" +
f6(null.asInstanceOf[Unit]) +
f6( n1.asInstanceOf[Unit]) +
f6( n2.asInstanceOf[Unit]) +
f6( n3.asInstanceOf[Unit]) +
f6( n4[Unit]) // "null"
assertEquals(result,
"0000null-0npe0npenull-()()()()null-0000null-0npe0npenull-()()()()null-0000null-0npe0npenull-()()()()null-00000-0npe0npenpe-()()()()null")
}
}
|
