androidx.compose.compiler.plugins.kotlin.lower.ComposerIntrinsicTransformer.kt Maven / Gradle / Ivy
/*
* Copyright 2019 The Android Open Source Project
*
* 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 androidx.compose.compiler.plugins.kotlin.lower
import androidx.compose.compiler.plugins.kotlin.ComposeFqNames
import androidx.compose.compiler.plugins.kotlin.lower.decoys.DecoyFqNames
import org.jetbrains.kotlin.backend.common.FileLoweringPass
import org.jetbrains.kotlin.backend.common.extensions.IrPluginContext
import org.jetbrains.kotlin.ir.declarations.IrFile
import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
import org.jetbrains.kotlin.ir.expressions.IrCall
import org.jetbrains.kotlin.ir.expressions.IrExpression
import org.jetbrains.kotlin.ir.util.dump
import org.jetbrains.kotlin.ir.util.kotlinFqName
import org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid
import org.jetbrains.kotlin.ir.visitors.transformChildrenVoid
import org.jetbrains.kotlin.name.FqName
class ComposerIntrinsicTransformer(
val context: IrPluginContext,
private val decoysEnabled: Boolean
) :
IrElementTransformerVoid(),
FileLoweringPass,
ModuleLoweringPass {
private val currentComposerIntrinsic = currentComposerFqName()
// get-currentComposer gets transformed as decoy, as the getter now has additional params
private fun currentComposerFqName(): FqName =
if (decoysEnabled) {
DecoyFqNames.CurrentComposerIntrinsic
} else {
ComposeFqNames.CurrentComposerIntrinsic
}
override fun lower(module: IrModuleFragment) {
module.transformChildrenVoid(this)
}
override fun lower(irFile: IrFile) {
irFile.transformChildrenVoid(this)
}
override fun visitCall(expression: IrCall): IrExpression {
if (expression.symbol.owner.kotlinFqName == currentComposerIntrinsic) {
// since this call was transformed by the ComposerParamTransformer, the first argument
// to this call is the composer itself. We just replace this expression with the
// argument expression and we are good.
val expectedArgumentsCount = 1 + // composer parameter
1 // changed parameter
assert(expression.valueArgumentsCount == expectedArgumentsCount) {
"""
Composer call doesn't match expected argument count:
expected: $expectedArgumentsCount,
actual: ${expression.valueArgumentsCount},
expression: ${expression.dump()}
""".trimIndent()
}
return expression.getValueArgument(0)
?: error("Expected non-null composer argument")
}
return super.visitCall(expression)
}
}