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Pass along type in IfNullExpressionFusionLowering

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This commit is contained in:
Georgy Bronnikov
2020-04-23 14:10:33 +03:00
parent f95ff049c6
commit 565874b3a0
8 changed files with 51 additions and 8 deletions
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compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/IfNullExpressionsFusionLowering.kt
+12 -8
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@@ -22,6 +22,7 @@ import org.jetbrains.kotlin.ir.expressions.impl.IrGetValueImpl
import org.jetbrains.kotlin.ir.expressions.impl.IrTypeOperatorCallImpl
import org.jetbrains.kotlin.ir.symbols.IrVariableSymbol
import org.jetbrains.kotlin.ir.symbols.impl.IrVariableSymbolImpl
import org.jetbrains.kotlin.ir.types.IrType
import org.jetbrains.kotlin.ir.types.isNullable
import org.jetbrains.kotlin.ir.util.*
import org.jetbrains.kotlin.ir.visitors.*
@@ -104,6 +105,7 @@ class IfNullExpressionsFusionLowering(val context: CommonBackendContext) : FileL
private fun fuseIfNullExpressions(expression: IrBlock) {
val ifNull1 = expression.matchIfNullExpr() ?: return
val ifNull2 = ifNull1.subjectExpr.matchIfNullExpr() ?: return
val type = expression.type
val u = ifNull1.subjectVar
// We are going to erase 1st variable. Do so only if it is temporary (true for variables introduced for '?.' and '?:').
@@ -123,14 +125,14 @@ class IfNullExpressionsFusionLowering(val context: CommonBackendContext) : FileL
val b1tmp2 = b1.substituteVariable(u.symbol, tmp2.symbol)
val v = ifNull2.subjectVar
val c0 = simplifyIfNull(tmp1, b0tmp1, b1tmp1, v.symbol, true)
val c1 = simplifyIfNull(tmp2, b0tmp2, b1tmp2, v.symbol, false)
val c0 = simplifyIfNull(tmp1, b0tmp1, b1tmp1, v.symbol, type, true)
val c1 = simplifyIfNull(tmp2, b0tmp2, b1tmp2, v.symbol, type, false)
val sizeBeforeEstimate = a0.size() + a1.size() + b0.size() + b1.size() + 1
val sizeAfterEstimate = c0.size() + c1.size()
if (sizeBeforeEstimate < sizeAfterEstimate) return
val newBlock = constructIfNullExpr(v, c0, c1)
val newBlock = constructIfNullExpr(v, c0, c1, type)
expression.statements.clear()
expression.statements.addAll(newBlock.statements)
@@ -159,16 +161,17 @@ class IfNullExpressionsFusionLowering(val context: CommonBackendContext) : FileL
ifNullExpr: IrExpression,
ifNotNullExpr: IrExpression,
knownVariableSymbol: IrVariableSymbol,
type: IrType,
knownVariableIsNull: Boolean
): IrExpression {
val subjectExpr = subjectVariable.initializer
?: throw AssertionError("Subject variable should have an initializer: ${subjectVariable.render()}")
val ifNullResultExpr = ifNullExpr.safeReplaceSubjectVariableWithSubjectExpression(subjectVariable)
?: return constructIfNullExpr(subjectVariable, ifNullExpr, ifNotNullExpr)
?: return constructIfNullExpr(subjectVariable, ifNullExpr, ifNotNullExpr, type)
val ifNotNullResultExpr = ifNotNullExpr.safeReplaceSubjectVariableWithSubjectExpression(subjectVariable)
?: return constructIfNullExpr(subjectVariable, ifNullExpr, ifNotNullExpr)
?: return constructIfNullExpr(subjectVariable, ifNullExpr, ifNotNullExpr, type)
return when {
subjectExpr is IrConst<*> ->
@@ -198,7 +201,7 @@ class IfNullExpressionsFusionLowering(val context: CommonBackendContext) : FileL
ifNotNullResultExpr
else ->
constructIfNullExpr(subjectVariable, ifNullExpr, ifNotNullExpr)
constructIfNullExpr(subjectVariable, ifNullExpr, ifNotNullExpr, type)
}
}
@@ -299,13 +302,14 @@ class IfNullExpressionsFusionLowering(val context: CommonBackendContext) : FileL
private fun constructIfNullExpr(
subjectVariable: IrVariable,
ifNullExpr: IrExpression,
ifNotNullExpr: IrExpression
ifNotNullExpr: IrExpression,
type: IrType
): IrContainerExpression =
context.createIrBuilder(subjectVariable.symbol, subjectVariable.startOffset, subjectVariable.endOffset)
.irBlock {
+subjectVariable
+irIfNull(
ifNullExpr.type,
type,
irGet(subjectVariable),
ifNullExpr,
ifNotNullExpr