[JS IR] Cache JsLocation objects and js function signatures

Memory consumption optimization

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/JsIrBackendContext.kt

@@ -408,4 +408,10 @@ class JsIrBackendContext(
         outlinedJsCodeFunctions[symbol] = parsedJsFunction
         return parsedJsFunction
     }
+
+    private var irFunctionSignatureCache = hashMapOf<IrFunction, String>()
+
+    fun getFunctionSignatureFromCache(f: IrFunction): String {
+        return irFunctionSignatureCache.getOrPut(f) { calculateJsFunctionSignature(f, this) }
+    }
 }

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/jsAstUtils.kt

@@ -494,11 +494,15 @@ internal fun <T : JsNode> T.withSource(node: IrElement, context: JsGenerationCon
 private inline fun <T : JsNode> T.addSourceInfoIfNeed(node: IrElement, context: JsGenerationContext) {
     if (!context.staticContext.genSourcemaps) return
 
-    val sourceInfo = node.getSourceInfo(context.currentFile.fileEntry) ?: return
+    var cachedLocation = context.getLocationFromCache(node)
+    if (cachedLocation == null) {
+        cachedLocation = node.getSourceInfo(context.currentFile.fileEntry) ?: return
+        context.saveLocationToCache(node, cachedLocation)
+    }
 
     // TODO maybe it's better to fix in JsExpressionStatement
     val locationTarget = if (this is JsExpressionStatement) this.expression else this
-    locationTarget.source = sourceInfo
+    locationTarget.source = cachedLocation
 }
 
 fun IrElement.getSourceInfo(container: IrDeclaration): JsLocation? {

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/JsGenerationContext.kt

@@ -10,6 +10,7 @@ import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.expressions.IrLoop
 import org.jetbrains.kotlin.ir.expressions.IrReturnableBlock
 import org.jetbrains.kotlin.ir.symbols.IrFunctionSymbol
+import org.jetbrains.kotlin.js.backend.ast.JsLocation
 import org.jetbrains.kotlin.js.backend.ast.JsName
 import org.jetbrains.kotlin.js.backend.ast.JsScope
 
@@ -27,7 +28,9 @@ class JsGenerationContext(
     val localNames: LocalNameGenerator? = null,
     private val nameCache: MutableMap<IrElement, JsName> = mutableMapOf(),
     private val useBareParameterNames: Boolean = false,
-): IrNamer by staticContext {
+) : IrNamer by staticContext {
+    private val locationCache = mutableMapOf<Int, JsLocation>()
+
     fun newFile(file: IrFile, func: IrFunction? = null, localNames: LocalNameGenerator? = null): JsGenerationContext {
         return JsGenerationContext(
             currentFile = file,
@@ -79,4 +82,8 @@ class JsGenerationContext(
     fun checkIfJsCode(symbol: IrFunctionSymbol): Boolean = symbol == staticContext.backendContext.intrinsics.jsCode
 
     fun checkIfHasAssociatedJsCode(symbol: IrFunctionSymbol): Boolean = staticContext.backendContext.getJsCodeForFunction(symbol) != null
+
+    fun getLocationFromCache(node: IrElement) = locationCache[node.startOffset]
+
+    fun saveLocationToCache(node: IrElement, location: JsLocation) = locationCache.put(node.startOffset, location)
 }

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/NameTables.kt

@@ -115,23 +115,8 @@ fun Int.toJsIdentifier(): String {
     }
 }
 
-fun jsFunctionSignature(declaration: IrFunction, context: JsIrBackendContext): String {
-    require(!declaration.isStaticMethodOfClass)
-    require(declaration.dispatchReceiverParameter != null)
-
-    var declarationName = declaration.getJsNameOrKotlinName().asString()
-
-    if (declaration.hasStableJsName(context)) {
-        // TODO: Handle reserved suffix in FE
-        require(!declarationName.endsWith(RESERVED_MEMBER_NAME_SUFFIX)) {
-            "Function ${declaration.fqNameWhenAvailable} uses reserved name suffix \"$RESERVED_MEMBER_NAME_SUFFIX\""
-        }
-        return declarationName
-    }
-
-    declaration.nameIfPropertyAccessor()?.let {
-        declarationName = it
-    }
+fun calculateJsFunctionSignature(declaration: IrFunction, context: JsIrBackendContext): String {
+    val declarationName = declaration.nameIfPropertyAccessor() ?: declaration.getJsNameOrKotlinName().asString()
 
     val nameBuilder = StringBuilder()
     nameBuilder.append(declarationName)
@@ -170,6 +155,23 @@ fun jsFunctionSignature(declaration: IrFunction, context: JsIrBackendContext): S
     ) + "_" + abs(signature.hashCode()).toString(Character.MAX_RADIX) + RESERVED_MEMBER_NAME_SUFFIX
 }
 
+fun jsFunctionSignature(declaration: IrFunction, context: JsIrBackendContext): String {
+    require(!declaration.isStaticMethodOfClass)
+    require(declaration.dispatchReceiverParameter != null)
+
+    if (declaration.hasStableJsName(context)) {
+        val declarationName = declaration.getJsNameOrKotlinName().asString()
+        // TODO: Handle reserved suffix in FE
+        require(!declarationName.endsWith(RESERVED_MEMBER_NAME_SUFFIX)) {
+            "Function ${declaration.fqNameWhenAvailable} uses reserved name suffix \"$RESERVED_MEMBER_NAME_SUFFIX\""
+        }
+        return declarationName
+    }
+
+    val declarationSignature = (declaration as? IrSimpleFunction)?.resolveFakeOverride() ?: declaration
+    return context.getFunctionSignatureFromCache(declarationSignature)
+}
+
 class NameTables(
     packages: Iterable<IrPackageFragment>,
     reservedForGlobal: MutableSet<String> = mutableSetOf(),
@@ -411,7 +413,8 @@ fun sanitizeName(name: String, withHash: Boolean = true): String {
     if (name.isValidES5Identifier()) return name
     if (name.isEmpty()) return "_"
 
-    val builder = StringBuilder()
+    // 7 = _ + MAX_INT.toString(Character.MAX_RADIX)
+    val builder = StringBuilder(name.length + if (withHash) 7 else 0)
 
     val first = name.first()
 

js/js.ast/src/org/jetbrains/kotlin/js/backend/ast/JsLocation.kt

@@ -19,12 +19,14 @@ package org.jetbrains.kotlin.js.backend.ast
 import java.io.Reader
 
 data class JsLocation(
-        override val file: String,
-        override val startLine: Int,
-        override val startChar: Int
+    override val file: String,
+    override val startLine: Int,
+    override val startChar: Int
 ) : JsLocationWithSource {
-    override val identityObject: Any? = null
-    override val sourceProvider: () -> Reader? = { null }
+    override val identityObject: Any?
+        get() = null
+    override val sourceProvider: () -> Reader?
+        get() = { null }
 
     override fun asSimpleLocation(): JsLocation = this
 }
@@ -40,7 +42,7 @@ interface JsLocationWithSource {
 }
 
 class JsLocationWithEmbeddedSource(
-        private val location: JsLocation,
-        override val identityObject: Any?,
-        override val sourceProvider: () -> Reader?
-) : JsLocationWithSource by location
+    private val location: JsLocation,
+    override val identityObject: Any?,
+    override val sourceProvider: () -> Reader?
+) : JsLocationWithSource by location