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[kotlin] Implement evaluatable getters filtering using Kotlin class m…
…etadata Previously, evaluatable getters in the variables view of the Kotlin debugger relied on a filtering heuristic that inspected bytecode of each getter. Unfortunately, such filtering was incorrect in some cases. Moreover the filtering was disabled completely in the Android Studio debugger, because method bytecode is not available there. This commit reimplements filtering of evaluatable getters by using Kotlin class metadata, fetched by `MetadataDebugHelper`.
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168 changes: 168 additions & 0 deletions
168
...er/core/src/org/jetbrains/kotlin/idea/debugger/core/KotlinMetadataDebuggerCacheService.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,168 @@ | ||
| // Copyright 2000-2025 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license. | ||
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| package org.jetbrains.kotlin.idea.debugger.core | ||
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| import com.google.gson.Gson | ||
| import com.google.gson.JsonSyntaxException | ||
| import com.intellij.debugger.engine.DebugProcess | ||
| import com.intellij.debugger.engine.evaluation.EvaluationContext | ||
| import com.intellij.debugger.engine.evaluation.EvaluationContextImpl | ||
| import com.intellij.debugger.impl.DebuggerManagerListener | ||
| import com.intellij.debugger.impl.DebuggerSession | ||
| import com.intellij.debugger.impl.DebuggerUtilsImpl | ||
| import com.intellij.openapi.components.Service | ||
| import com.intellij.openapi.components.service | ||
| import com.intellij.openapi.project.Project | ||
| import com.intellij.rt.debugger.MetadataDebugHelper | ||
| import com.sun.jdi.ReferenceType | ||
| import com.sun.jdi.StringReference | ||
| import com.sun.jdi.Value | ||
| import org.jetbrains.annotations.ApiStatus | ||
| import org.jetbrains.kotlin.idea.debugger.base.util.wrapEvaluateException | ||
| import org.jetbrains.kotlin.idea.debugger.base.util.wrapIllegalArgumentException | ||
| import kotlin.io.encoding.Base64 | ||
| import kotlin.io.encoding.ExperimentalEncodingApi | ||
| import kotlin.metadata.jvm.KotlinClassMetadata | ||
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| @ApiStatus.Internal | ||
| @Service(Service.Level.PROJECT) | ||
| class KotlinMetadataDebuggerCacheService private constructor(project: Project) { | ||
| companion object { | ||
| @JvmStatic | ||
| fun getInstance(project: Project): KotlinMetadataDebuggerCacheService = project.service() | ||
| } | ||
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| private class KotlinMetadataCacheListener(private val project: Project) : DebuggerManagerListener { | ||
| override fun sessionCreated(session: DebuggerSession) { | ||
| getInstance(project).createCache(session.process) | ||
| } | ||
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| override fun sessionRemoved(session: DebuggerSession) { | ||
| getInstance(project).removeCache(session.process) | ||
| } | ||
| } | ||
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| // There is one cache per debug process. The size of the list will almost always be 1 when debugging. | ||
| private val caches = mutableListOf<KotlinMetadataCache>() | ||
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| fun getKotlinMetadata(refType: ReferenceType, context: EvaluationContext): KotlinClassMetadata? { | ||
| return getCache(context)?.fetchKotlinMetadata(refType, context) | ||
| } | ||
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| fun getKotlinMetadataList(refTypes: Collection<ReferenceType>, context: EvaluationContext): List<KotlinClassMetadata>? { | ||
| return getCache(context)?.fetchKotlinMetadataList(refTypes, context) | ||
| } | ||
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| private fun getCache(context: EvaluationContext): KotlinMetadataCache? { | ||
| return caches.firstOrNull { it.debugProcess == context.debugProcess } | ||
| } | ||
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| private fun createCache(debugProcess: DebugProcess) { | ||
| caches.add(KotlinMetadataCache(debugProcess)) | ||
| } | ||
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| private fun removeCache(debugProcess: DebugProcess) { | ||
| caches.removeIf { it.debugProcess === debugProcess } | ||
| } | ||
| } | ||
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| private class KotlinMetadataCache(val debugProcess: DebugProcess) { | ||
| private class MetadataAdapter( | ||
| val kind: Int, | ||
| val metadataVersion: Array<Int>, | ||
| val data1: Array<String>, | ||
| val data2: Array<String>, | ||
| val extraString: String, | ||
| val packageName: String, | ||
| val extraInt: Int, | ||
| ) { | ||
| @OptIn(ExperimentalEncodingApi::class) | ||
| fun toMetadata(): Metadata { | ||
| return Metadata( | ||
| kind = kind, | ||
| metadataVersion = metadataVersion.toIntArray(), | ||
| data1 = data1.map { String(Base64.Default.decode(it)) }.toTypedArray(), | ||
| data2 = data2, | ||
| extraString = extraString, | ||
| packageName = packageName, | ||
| extraInt = extraInt | ||
| ) | ||
| } | ||
| } | ||
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| private val cache = mutableMapOf<ReferenceType, KotlinClassMetadata>() | ||
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| fun fetchKotlinMetadata(refType: ReferenceType, context: EvaluationContext): KotlinClassMetadata? { | ||
| cache[refType]?.let { return it } | ||
| val metadataAsJson = callMethodFromHelper( | ||
| context, "getDebugMetadataAsJson", listOf(refType.classObject()) | ||
| ) ?: return null | ||
| val metadata = parseMetadataFromJson(metadataAsJson) ?: return null | ||
| cache[refType] = metadata | ||
| return metadata | ||
| } | ||
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| fun fetchKotlinMetadataList(refTypes: Collection<ReferenceType>, context: EvaluationContext): List<KotlinClassMetadata>? { | ||
| val result = mutableListOf<KotlinClassMetadata>() | ||
| val toFetch = mutableListOf<ReferenceType>() | ||
| for (refType in refTypes) { | ||
| val metadata = cache[refType] | ||
| if (metadata != null) { | ||
| result.add(metadata) | ||
| } else { | ||
| toFetch.add(refType) | ||
| } | ||
| } | ||
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| if (toFetch.isEmpty()) { | ||
| return result | ||
| } | ||
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| val classObjects = toFetch.map { it.classObject() } | ||
| val concatenatedJsonMetadatas = callMethodFromHelper( | ||
| context, "getDebugMetadataListAsJson", classObjects | ||
| ) ?: return null | ||
| val splitJsonMetadatas = concatenatedJsonMetadatas.split(MetadataDebugHelper.METADATA_SEPARATOR) | ||
| if (splitJsonMetadatas.size != toFetch.size) { | ||
| return null | ||
| } | ||
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| for ((metadataAsJson, refType) in splitJsonMetadatas.zip(toFetch)) { | ||
| val metadata = parseMetadataFromJson(metadataAsJson) ?: return null | ||
| cache[refType] = metadata | ||
| result.add(metadata) | ||
| } | ||
| return result | ||
| } | ||
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| private fun parseMetadataFromJson(metadataAsJson: String): KotlinClassMetadata? { | ||
| val metadata = wrapJsonSyntaxException { | ||
| Gson().fromJson(metadataAsJson, MetadataAdapter::class.java).toMetadata() | ||
| } ?: return null | ||
| val parsedMetadata = wrapIllegalArgumentException { | ||
| KotlinClassMetadata.readStrict(metadata) | ||
| } ?: return null | ||
| return parsedMetadata | ||
| } | ||
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| private fun callMethodFromHelper(context: EvaluationContext, methodName: String, args: List<Value>): String? { | ||
| return wrapEvaluateException { | ||
| val value = DebuggerUtilsImpl.invokeHelperMethod( | ||
| context as EvaluationContextImpl, | ||
| MetadataDebugHelper::class.java, | ||
| methodName, | ||
| args, | ||
| true | ||
| ) | ||
| (value as? StringReference)?.value() | ||
| } | ||
| } | ||
| } | ||
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| private fun <T> wrapJsonSyntaxException(block: () -> T): T? { | ||
| return try { | ||
| block() | ||
| } catch (_: JsonSyntaxException) { | ||
| null | ||
| } | ||
| } |
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