org.jetbrains.kotlin.backend.common.lower.loops.handlers.RangeToHandler.kt Maven / Gradle / Ivy

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/*
 * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
 * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
 */

package org.jetbrains.kotlin.backend.common.lower.loops.handlers

import org.jetbrains.kotlin.backend.common.CommonBackendContext
import org.jetbrains.kotlin.backend.common.lower.createIrBuilder
import org.jetbrains.kotlin.backend.common.lower.loops.*
import org.jetbrains.kotlin.backend.common.lower.loops.ProgressionDirection
import org.jetbrains.kotlin.backend.common.lower.loops.ProgressionHandler
import org.jetbrains.kotlin.backend.common.lower.loops.ProgressionHeaderInfo
import org.jetbrains.kotlin.backend.common.lower.loops.ProgressionType
import org.jetbrains.kotlin.backend.common.lower.matchers.SimpleCalleeMatcher
import org.jetbrains.kotlin.ir.builders.irInt
import org.jetbrains.kotlin.ir.expressions.IrCall
import org.jetbrains.kotlin.ir.symbols.IrSymbol
import org.jetbrains.kotlin.ir.types.IrType
import org.jetbrains.kotlin.util.OperatorNameConventions

/** Builds a [HeaderInfo] for progressions built using the `rangeTo` function. */
internal class RangeToHandler(private val context: CommonBackendContext) :
    ProgressionHandler {

    private val progressionElementTypes = context.ir.symbols.progressionElementTypes

    override val matcher = SimpleCalleeMatcher {
        dispatchReceiver { it != null && it.type in progressionElementTypes }
        fqName { it.pathSegments().last() == OperatorNameConventions.RANGE_TO }
        parameterCount { it == 1 }
        parameter(0) { it.type in progressionElementTypes }
    }

    override fun build(expression: IrCall, data: ProgressionType, scopeOwner: IrSymbol) =
        with(context.createIrBuilder(scopeOwner, expression.startOffset, expression.endOffset)) {
            ProgressionHeaderInfo(
                data,
                first = expression.dispatchReceiver!!,
                last = expression.getValueArgument(0)!!,
                step = irInt(1),
                direction = ProgressionDirection.INCREASING
            )
        }
}