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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package tests
import (
"math/rand"
"testing"
)
func TestEmptyStruct(t *testing.T) {
runTestCases(t, false, "plain", []interface{}{
unregisteredEmptyStruct{},
typeOnlyEmptyStruct{},
savableEmptyStruct{},
})
runTestCases(t, false, "pointers", pointersTo([]interface{}{
unregisteredEmptyStruct{},
typeOnlyEmptyStruct{},
savableEmptyStruct{},
}))
runTestCases(t, false, "interfaces-pass", interfacesTo([]interface{}{
// Only registered types can be dispatched via interfaces. All
// other types should fail, even if it is the empty struct.
savableEmptyStruct{},
}))
runTestCases(t, true, "interfaces-fail", interfacesTo([]interface{}{
unregisteredEmptyStruct{},
typeOnlyEmptyStruct{},
}))
runTestCases(t, false, "interfacesToPointers-pass", interfacesTo(pointersTo([]interface{}{
savableEmptyStruct{},
})))
runTestCases(t, true, "interfacesToPointers-fail", interfacesTo(pointersTo([]interface{}{
unregisteredEmptyStruct{},
typeOnlyEmptyStruct{},
})))
// Ensuring empty struct aliasing works.
es := emptyStructPointer{new(struct{})}
runTestCases(t, false, "empty-struct-pointers", []interface{}{
emptyStructPointer{},
es,
[]emptyStructPointer{es, es}, // Same pointer.
})
}
func TestEmbeddedPointers(t *testing.T) {
// Give each int64 a random value to prevent Go from using
// runtime.staticuint64s, which confounds tests for struct duplication.
magic := func() int64 {
for {
n := rand.Int63()
if n < 0 || n > 255 {
return n
}
}
}
ofs := outerSame{inner{magic()}}
of1 := outerFieldFirst{inner{magic()}, magic()}
of2 := outerFieldSecond{magic(), inner{magic()}}
oa := outerArray{[2]inner{{magic()}, {magic()}}}
osl := outerSlice{oa.inner[:]}
ofv := outerFieldValue{innerFieldValue{magic()}}
runTestCases(t, false, "embedded-pointers", []interface{}{
system{&ofs, &ofs.inner},
system{&ofs.inner, &ofs},
system{&of1, &of1.inner},
system{&of1.inner, &of1},
system{&of2, &of2.inner},
system{&of2.inner, &of2},
system{&oa, &oa.inner[0]},
system{&oa, &oa.inner[1]},
system{&oa.inner[0], &oa},
system{&oa.inner[1], &oa},
system3{&oa, &oa.inner[0], &oa.inner[1]},
system3{&oa, &oa.inner[1], &oa.inner[0]},
system3{&oa.inner[0], &oa, &oa.inner[1]},
system3{&oa.inner[1], &oa, &oa.inner[0]},
system3{&oa.inner[0], &oa.inner[1], &oa},
system3{&oa.inner[1], &oa.inner[0], &oa},
system{&oa, &osl},
system{&osl, &oa},
system{&ofv, &ofv.inner},
system{&ofv.inner, &ofv},
})
}
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