org.jetbrains.kotlin.psi2ir.intermediate.SafeCallReceiver.kt Maven / Gradle / Ivy

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/*
 * 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.builders.constNull
import org.jetbrains.kotlin.ir.builders.equalsNull
import org.jetbrains.kotlin.ir.expressions.impl.IrBlockImpl
import org.jetbrains.kotlin.ir.expressions.IrExpression
import org.jetbrains.kotlin.ir.expressions.impl.IrIfThenElseImpl
import org.jetbrains.kotlin.ir.expressions.IrStatementOrigin
import org.jetbrains.kotlin.psi2ir.generators.GeneratorWithScope
import org.jetbrains.kotlin.types.typeUtil.builtIns
import org.jetbrains.kotlin.types.typeUtil.makeNullable


class SafeCallReceiver(
        val generator: GeneratorWithScope,
        val startOffset: Int,
        val endOffset: Int,
        val extensionReceiver: IntermediateValue?,
        val dispatchReceiver: IntermediateValue?,
        val isAssignmentReceiver: Boolean
) : CallReceiver {
    override fun call(withDispatchAndExtensionReceivers: (IntermediateValue?, IntermediateValue?) -> IrExpression): IrExpression {
        val irTmp = generator.scope.createTemporaryVariable(extensionReceiver?.load() ?: dispatchReceiver!!.load(), "safe_receiver")
        val safeReceiverValue = VariableLValue(irTmp)

        val dispatchReceiverValue: IntermediateValue?
        val extensionReceiverValue: IntermediateValue?
        if (extensionReceiver != null) {
            dispatchReceiverValue = dispatchReceiver
            extensionReceiverValue = safeReceiverValue
        }
        else {
            dispatchReceiverValue = safeReceiverValue
            extensionReceiverValue = null
        }

        val irResult = withDispatchAndExtensionReceivers(dispatchReceiverValue, extensionReceiverValue)
        val resultType = if (isAssignmentReceiver) irResult.type.builtIns.unitType else irResult.type.makeNullable()

        val irBlock = IrBlockImpl(startOffset, endOffset, resultType, IrStatementOrigin.SAFE_CALL)

        irBlock.statements.add(irTmp)

        val irIfThenElse = IrIfThenElseImpl(startOffset, endOffset, resultType,
                                            generator.context.equalsNull(startOffset, endOffset, safeReceiverValue.load()),
                                            generator.context.constNull(startOffset, endOffset),
                                            irResult,
                                            IrStatementOrigin.SAFE_CALL)
        irBlock.statements.add(irIfThenElse)

        return irBlock
    }
}