org.jetbrains.kotlin.psi2ir.intermediate.OnceExpressionValue.kt Maven / Gradle / Ivy
/*
* Copyright 2010-2016 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.psi2ir.intermediate
import org.jetbrains.kotlin.ir.expressions.IrExpression
import org.jetbrains.kotlin.ir.types.IrType
import org.jetbrains.kotlin.ir.util.render
import org.jetbrains.kotlin.types.KotlinType
abstract class ExpressionValue(override val type: IrType) : IntermediateValue
inline fun generateExpressionValue(type: IrType, crossinline generate: () -> IrExpression) =
object : ExpressionValue(type) {
override fun load(): IrExpression = generate()
}
inline fun generateDelegatedValue(type: IrType, crossinline generateValue: () -> IntermediateValue) =
object : ExpressionValue(type) {
val lazyDelegate by lazy { generateValue() }
override fun load(): IrExpression = lazyDelegate.load()
}
class OnceExpressionValue(val irExpression: IrExpression) : LValue, AssignmentReceiver {
private var instantiated = false
override fun load(): IrExpression {
if (instantiated) throw AssertionError("Single expression value for ${irExpression.render()} is already instantiated")
instantiated = true
return irExpression
}
override val type: IrType get() = irExpression.type
override fun store(irExpression: IrExpression): IrExpression {
throw AssertionError("Expression value ${irExpression.render()} can't be used in store operation")
}
override fun assign(withLValue: (LValue) -> IrExpression): IrExpression =
withLValue(this)
}