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Merged
merged 1 commit into from
Aug 4, 2022
Merged

Introduce Java Object Layout to the codebase and write tests for core… #3391

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1 change: 1 addition & 0 deletions kotlinx-coroutines-core/build.gradle
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Original file line number Diff line number Diff line change
Expand Up @@ -168,6 +168,7 @@ kotlin.sourceSets {
api "org.jetbrains.kotlinx:lincheck:$lincheck_version"
api "org.jetbrains.kotlinx:kotlinx-knit-test:$knit_version"
implementation project(":android-unit-tests")
implementation "org.openjdk.jol:jol-core:0.16"
}
}

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25 changes: 25 additions & 0 deletions kotlinx-coroutines-core/jvm/test/MemoryFootprintTest.kt
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@@ -0,0 +1,25 @@
/*
* Copyright 2016-2022 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/

package kotlinx.coroutines

import org.junit.Test
import org.openjdk.jol.info.ClassLayout
import kotlin.test.*


class MemoryFootprintTest : TestBase(true) {

@Test
fun testJobLayout() = assertLayout(Job().javaClass, 24)

@Test
fun testCancellableContinuationFootprint() = assertLayout(CancellableContinuationImpl::class.java, 48)

private fun assertLayout(clz: Class<*>, expectedSize: Int) {
val size = ClassLayout.parseClass(clz).instanceSize()
// println(ClassLayout.parseClass(clz).toPrintable())
assertEquals(expectedSize.toLong(), size)
}
}