.kotlin.kotlin-compiler.1.3.11.source-code.nullabilityValues.kt Maven / Gradle / Ivy
/*
* Copyright 2010-2017 JetBrains s.r.o.
*
* 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 org.jetbrains.kotlin.codegen.optimization.nullCheck
import org.jetbrains.kotlin.codegen.optimization.boxing.ProgressionIteratorBasicValue
import org.jetbrains.kotlin.codegen.optimization.common.StrictBasicValue
import org.jetbrains.kotlin.resolve.jvm.AsmTypes
import org.jetbrains.org.objectweb.asm.Type
import org.jetbrains.org.objectweb.asm.tree.analysis.BasicValue
class NotNullBasicValue(type: Type?) : StrictBasicValue(type) {
override fun equals(other: Any?): Boolean = other is NotNullBasicValue && other.type == type
// We do not differ not-nullable values, so we should always return the same hashCode
// Actually it doesn't really matter because analyzer is not supposed to store values in hashtables
override fun hashCode() = 0
companion object {
val NOT_NULL_REFERENCE_VALUE = NotNullBasicValue(StrictBasicValue.REFERENCE_VALUE.type)
}
}
object NullBasicValue : StrictBasicValue(AsmTypes.OBJECT_TYPE)
enum class Nullability {
NULL, NOT_NULL, NULLABLE;
fun isNull() = this == NULL
fun isNotNull() = this == NOT_NULL
}
fun BasicValue.getNullability(): Nullability =
when (this) {
is NullBasicValue -> Nullability.NULL
is NotNullBasicValue -> Nullability.NOT_NULL
is ProgressionIteratorBasicValue -> Nullability.NOT_NULL
else -> Nullability.NULLABLE
}