androidx.compose.compiler.plugins.kotlin.WeakBindingTrace.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
import com.intellij.util.keyFMap.KeyFMap
import java.util.WeakHashMap
import org.jetbrains.kotlin.backend.common.extensions.IrPluginContext
import org.jetbrains.kotlin.ir.declarations.IrAttributeContainer
import org.jetbrains.kotlin.util.slicedMap.ReadOnlySlice
import org.jetbrains.kotlin.util.slicedMap.WritableSlice
/**
* This class is meant to have the shape of a BindingTrace object that could exist and flow
* through the Psi2Ir -> Ir phase, but doesn't currently exist. Ideally, this gets replaced in
* the future by a trace that handles this use case in upstream. For now, we are okay with this
* because the combination of IrAttributeContainer and WeakHashMap makes this relatively safe.
*/
class WeakBindingTrace {
private val map = WeakHashMap()
fun record(slice: WritableSlice, key: K, value: V) {
var holder = map[key.attributeOwnerId] ?: KeyFMap.EMPTY_MAP
val prev = holder.get(slice.key)
if (prev != null) {
holder = holder.minus(slice.key)
}
holder = holder.plus(slice.key, value!!)
map[key.attributeOwnerId] = holder
}
operator fun get(slice: ReadOnlySlice, key: K): V? {
return map[key.attributeOwnerId]?.get(slice.key)
}
}
private val ComposeTemporaryGlobalBindingTrace = WeakBindingTrace()
@Suppress("unused")
val IrPluginContext.irTrace: WeakBindingTrace get() = ComposeTemporaryGlobalBindingTrace