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Knowledge accessor utilities #5099

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Knowledge accessor utilities #5099

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84f3866
Introduce common caching utilities.
sjrd Jan 2, 2025
feac5c1
Extract the notion of `KnowledgeAccessor` and `KnowledgeSource`.
sjrd Jan 2, 2025
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36 changes: 8 additions & 28 deletions linker/shared/src/main/scala/org/scalajs/linker/backend/BasicLinkerBackend.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,7 @@ import org.scalajs.linker.standard.ModuleSet.ModuleID

import org.scalajs.linker.backend.emitter.Emitter
import org.scalajs.linker.backend.javascript.{ByteArrayWriter, Printers, SourceMapWriter, Trees => js}
import org.scalajs.linker.caching._

/** The basic backend for the Scala.js linker.
*
Expand Down Expand Up @@ -185,7 +186,8 @@ private object BasicLinkerBackend {
private var _footerBytesCache: Array[Byte] = null
private var _headerNewLineCountCache: Int = 0

private val modules = new java.util.concurrent.ConcurrentHashMap[ModuleID, PrintedModuleCache]
private val modules: ConcurrentCacheMap[ModuleID, PrintedModuleCache] =
key => new PrintedModuleCache

def updateGlobal(header: String, footer: String): Boolean = {
if (header == lastHeader && footer == lastFooter) {
Expand All @@ -204,33 +206,17 @@ private object BasicLinkerBackend {
def footerBytes: Array[Byte] = _footerBytesCache
def headerNewLineCount: Int = _headerNewLineCountCache

def getModuleCache(moduleID: ModuleID): PrintedModuleCache = {
val result = modules.computeIfAbsent(moduleID, _ => new PrintedModuleCache)
result.startRun()
result
}
def getModuleCache(moduleID: ModuleID): PrintedModuleCache =
modules.get(moduleID)

def cleanAfterRun(): Unit = {
val iter = modules.entrySet().iterator()
while (iter.hasNext()) {
val moduleCache = iter.next().getValue()
if (!moduleCache.cleanAfterRun()) {
iter.remove()
}
}
}
def cleanAfterRun(): Unit =
modules.cleanAfterRun()
}

private sealed class PrintedModuleCache {
private var cacheUsed = false

private final class PrintedModuleCache extends Cache {
private var previousFinalJSFileSize: Int = 0
private var previousFinalSourceMapSize: Int = 0

def startRun(): Unit = {
cacheUsed = true
}

def getPreviousFinalJSFileSize(): Int = previousFinalJSFileSize

def getPreviousFinalSourceMapSize(): Int = previousFinalSourceMapSize
Expand All @@ -239,11 +225,5 @@ private object BasicLinkerBackend {
previousFinalJSFileSize = finalJSFileSize
previousFinalSourceMapSize = finalSourceMapSize
}

def cleanAfterRun(): Boolean = {
val wasUsed = cacheUsed
cacheUsed = false
wasUsed
}
}
}
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