Add a common JVM/JS lowering for Array(size, function)

and remove the hack from JVM_IR codegen that replaces this call with
hardcoded inline function bytecode.

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/ArrayConstructorLowering.kt

@@ -0,0 +1,143 @@
+/*
+ * Copyright 2010-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.backend.common.lower
+
+import org.jetbrains.kotlin.backend.common.CommonBackendContext
+import org.jetbrains.kotlin.backend.common.FileLoweringPass
+import org.jetbrains.kotlin.backend.common.IrElementTransformerVoidWithContext
+import org.jetbrains.kotlin.ir.builders.*
+import org.jetbrains.kotlin.ir.declarations.*
+import org.jetbrains.kotlin.ir.expressions.*
+import org.jetbrains.kotlin.ir.expressions.impl.IrGetValueImpl
+import org.jetbrains.kotlin.ir.symbols.IrFunctionSymbol
+import org.jetbrains.kotlin.ir.types.getClass
+import org.jetbrains.kotlin.ir.types.toKotlinType
+import org.jetbrains.kotlin.ir.util.*
+import org.jetbrains.kotlin.ir.visitors.transformChildrenVoid
+import org.jetbrains.kotlin.util.OperatorNameConventions
+
+class ArrayConstructorLowering(val context: CommonBackendContext) : IrElementTransformerVoidWithContext(), FileLoweringPass {
+    override fun lower(irFile: IrFile) {
+        irFile.transformChildrenVoid(this)
+    }
+
+    // Array(size, init) -> Array(size)
+    private val arrayInlineToSizeCtor: Map<IrFunctionSymbol, IrFunctionSymbol> =
+        (context.irBuiltIns.primitiveArrays + context.irBuiltIns.arrayClass).associate { arrayClass ->
+            val fromInit = arrayClass.constructors.single { it.owner.valueParameters.size == 2 }
+            val fromSize = arrayClass.constructors.find { it.owner.valueParameters.size == 1 }
+                ?: context.ir.symbols.arrayOfNulls // Array<T> has no unary constructor: it can only exist for Array<T?>
+            fromInit to fromSize
+        }
+
+    // Generate `array[index] = value`.
+    private fun IrBuilderWithScope.setItem(array: IrVariable, index: IrVariable, value: IrExpression) =
+        irCall(array.type.getClass()!!.functions.single { it.name.toString() == "set" }).apply {
+            dispatchReceiver = irGet(array)
+            putValueArgument(0, irGet(index))
+            putValueArgument(1, value)
+        }
+
+    // Generate `for (index in 0 until end) { element }`.
+    private fun IrBlockBuilder.fromZeroTo(end: IrVariable, element: IrBlockBuilder.(IrLoop, IrVariable) -> Unit) {
+        val index = irTemporaryVar(irInt(0))
+        +irWhile().apply {
+            condition = irCall(context.irBuiltIns.lessFunByOperandType[index.type.toKotlinType()]!!).apply {
+                putValueArgument(0, irGet(index))
+                putValueArgument(1, irGet(end))
+            }
+            body = irBlock {
+                val currentIndex = irTemporary(irGet(index))
+                val inc = index.type.getClass()!!.functions.single { it.name.asString() == "inc" }
+                +irSetVar(index.symbol, irCall(inc).apply { dispatchReceiver = irGet(index) })
+                element(this@apply, currentIndex)
+            }
+        }
+    }
+
+    private fun IrExpression.asSingleArgumentLambda(): IrSimpleFunction? {
+        // A lambda is represented as a block with a function declaration and a reference to it.
+        if (this !is IrBlock || statements.size != 2)
+            return null
+        val (function, reference) = statements
+        if (function !is IrSimpleFunction || reference !is IrFunctionReference || function.symbol != reference.symbol)
+            return null
+        // Only match the one that has exactly one non-vararg argument, as the code below
+        // does not handle defaults or varargs.
+        if (function.valueParameters.size != 1 || function.valueParameters[0].isVararg || reference.getValueArgument(0) != null)
+            return null
+        return function
+    }
+
+    override fun visitConstructorCall(expression: IrConstructorCall): IrExpression {
+        val sizeConstructor = arrayInlineToSizeCtor[expression.symbol]
+            ?: return super.visitConstructorCall(expression)
+        val arrayOfReferences = sizeConstructor == context.ir.symbols.arrayOfNulls
+
+        // inline fun <reified T> Array(size: Int, invokable: (Int) -> T): Array<T> {
+        //     val result = arrayOfNulls<T>(size)
+        //     for (i in 0 until size) {
+        //         result[i] = invokable(i)
+        //     }
+        //     return result as Array<T>
+        // }
+        // (and similar for primitive arrays)
+        val loweringContext = context
+        val size = expression.getValueArgument(0)!!.transform(this, null)
+        val invokable = expression.getValueArgument(1)!!.transform(this, null)
+        return context.createIrBuilder(currentScope!!.scope.scopeOwnerSymbol).irBlock(expression.startOffset, expression.endOffset) {
+            val sizeVar = irTemporary(size)
+            val result = irTemporary(irCall(sizeConstructor, expression.type).apply {
+                if (arrayOfReferences) {
+                    putTypeArgument(0, expression.getTypeArgument(0))
+                }
+                putValueArgument(0, irGet(sizeVar))
+            })
+
+            val lambda = invokable.asSingleArgumentLambda()
+            if (lambda == null) {
+                val invokableVar = irTemporary(invokable)
+                val invoke = invokable.type.getClass()!!.functions.single { it.name == OperatorNameConventions.INVOKE }
+                fromZeroTo(sizeVar) { _, index ->
+                    +setItem(result, index, irCall(invoke).apply {
+                        dispatchReceiver = irGet(invokableVar)
+                        putValueArgument(0, irGet(index))
+                    })
+                }
+            } else {
+                // Inline `invokable` by replacing the argument with `i` and `return x` with `result[i] = x; continue`.
+                fromZeroTo(sizeVar) { loop, index ->
+                    val body = lambda.body!!.transform(object : IrElementTransformerVoidWithContext() {
+                        override fun visitGetValue(expression: IrGetValue) =
+                            if (expression.symbol == lambda.valueParameters[0].symbol)
+                                IrGetValueImpl(expression.startOffset, expression.endOffset, index.symbol)
+                            else
+                                super.visitGetValue(expression)
+
+                        override fun visitReturn(expression: IrReturn) =
+                            if (expression.returnTargetSymbol == lambda.symbol) {
+                                val value = expression.value.transform(this, null)
+                                val scope = currentScope?.scope?.scopeOwnerSymbol ?: lambda.symbol
+                                loweringContext.createIrBuilder(scope).irBlock(expression.startOffset, expression.endOffset) {
+                                    +setItem(result, index, value)
+                                    +irContinue(loop)
+                                }
+                            } else {
+                                super.visitReturn(expression)
+                            }
+                    }, null)
+
+                    when (body) {
+                        is IrExpressionBody -> +setItem(result, index, body.expression)
+                        is IrBlockBody -> body.statements.forEach { +it }
+                        else -> throw AssertionError("unexpected function body type: $body")
+                    }
+                }
+            }
+            +irGet(result)
+        }
+    }
+}

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

@@ -84,6 +84,12 @@ private val lateinitLoweringPhase = makeJsModulePhase(
     description = "Insert checks for lateinit field references"
 )
 
+private val arrayConstructorPhase = makeJsModulePhase(
+    ::ArrayConstructorLowering,
+    name = "ArrayConstructor",
+    description = "Transform `Array(size) { index -> value }` into a loop"
+)
+
 private val functionInliningPhase = makeCustomJsModulePhase(
     { context, module ->
         FunctionInlining(context).inline(module)
@@ -351,6 +357,7 @@ val jsPhases = namedIrModulePhase(
     description = "IR module lowering",
     lower = testGenerationPhase then
             expectDeclarationsRemovingPhase then
+            arrayConstructorPhase then
             functionInliningPhase then
             lateinitLoweringPhase then
             tailrecLoweringPhase then

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/ArrayInlineConstructorLowering.kt

@@ -1,65 +0,0 @@
-/*
- * Copyright 2010-2018 JetBrains s.r.o. and Kotlin Programming Language contributors.
- * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
- */
-
-package org.jetbrains.kotlin.ir.backend.js.lower
-
-import org.jetbrains.kotlin.builtins.PrimitiveType
-import org.jetbrains.kotlin.ir.backend.js.JsIrBackendContext
-import org.jetbrains.kotlin.ir.declarations.IrConstructor
-import org.jetbrains.kotlin.ir.expressions.IrCall
-import org.jetbrains.kotlin.ir.expressions.IrConstructorCall
-import org.jetbrains.kotlin.ir.expressions.IrFunctionAccessExpression
-import org.jetbrains.kotlin.ir.expressions.copyTypeArgumentsFrom
-import org.jetbrains.kotlin.ir.expressions.impl.IrCallImpl
-import org.jetbrains.kotlin.ir.expressions.impl.IrConstructorCallImpl
-import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
-import org.jetbrains.kotlin.ir.util.irCall
-
-// Replace array inline constructors with stdlib function invocations
-class ArrayConstructorTransformer(
-    val context: JsIrBackendContext
-) {
-    // Inline constructor for CharArray is implemented in runtime
-    private val primitiveArrayInlineToSizeConstructorMap =
-        context.intrinsics.primitiveArrays.filter { it.value != PrimitiveType.CHAR }.keys.associate {
-            it.inlineConstructor to it.sizeConstructor
-        }
-
-    fun transformConstructorCall(expression: IrConstructorCall): IrFunctionAccessExpression {
-        if (expression.symbol == context.intrinsics.array.inlineConstructor) {
-            return irCall(expression, context.intrinsics.jsArray).apply {
-                copyTypeArgumentsFrom(expression)
-            }
-        } else {
-            primitiveArrayInlineToSizeConstructorMap[expression.symbol]?.let { sizeConstructor ->
-                return IrCallImpl(
-                    expression.startOffset,
-                    expression.endOffset,
-                    expression.type,
-                    context.intrinsics.jsFillArray
-                ).apply {
-                    putValueArgument(0, IrConstructorCallImpl.fromSymbolOwner(
-                        expression.startOffset,
-                        expression.endOffset,
-                        expression.type,
-                        sizeConstructor
-                    ).apply {
-                        putValueArgument(0, expression.getValueArgument(0))
-                    })
-                    putValueArgument(1, expression.getValueArgument(1))
-                }
-            }
-        }
-
-        return expression
-    }
-}
-
-// TODO it.isInline doesn't work =(
-private val IrClassSymbol.inlineConstructor
-    get() = owner.declarations.filterIsInstance<IrConstructor>().first { it.valueParameters.size == 2 }.symbol
-
-private val IrClassSymbol.sizeConstructor
-    get() = owner.declarations.filterIsInstance<IrConstructor>().first { it.valueParameters.size == 1 }.symbol

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/inline/FunctionInlining.kt

@@ -19,7 +19,6 @@ import org.jetbrains.kotlin.config.languageVersionSettings
 import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.IrStatement
 import org.jetbrains.kotlin.ir.backend.js.JsIrBackendContext
-import org.jetbrains.kotlin.ir.backend.js.lower.ArrayConstructorTransformer
 import org.jetbrains.kotlin.ir.builders.irGet
 import org.jetbrains.kotlin.ir.builders.irReturn
 import org.jetbrains.kotlin.ir.declarations.*
@@ -43,38 +42,31 @@ internal class FunctionInlining(val context: Context): IrElementTransformerVoidW
         return irModule.accept(this, data = null)
     }
 
-    private val arrayConstructorTransformer = ArrayConstructorTransformer(context)
-
     override fun visitFunctionAccess(expression: IrFunctionAccessExpression): IrExpression {
         expression.transformChildrenVoid(this)
 
-        val callSite = when (expression) {
-            is IrCall -> expression
-            is IrConstructorCall -> arrayConstructorTransformer.transformConstructorCall(expression)
-            else -> return expression
-        }
-        if (!callSite.symbol.owner.needsInlining)
-            return callSite
+        if (!(expression is IrCall || expression is IrConstructorCall) || !expression.symbol.owner.needsInlining)
+            return expression
 
         val languageVersionSettings = context.configuration.languageVersionSettings
         when {
-            Symbols.isLateinitIsInitializedPropertyGetter(callSite.symbol) ->
-                return callSite
+            Symbols.isLateinitIsInitializedPropertyGetter(expression.symbol) ->
+                return expression
             // Handle coroutine intrinsics
             // TODO These should actually be inlined.
-            callSite.descriptor.isBuiltInIntercepted(languageVersionSettings) ->
+            expression.descriptor.isBuiltInIntercepted(languageVersionSettings) ->
                 error("Continuation.intercepted is not available with release coroutines")
-            callSite.symbol.descriptor.isBuiltInSuspendCoroutineUninterceptedOrReturn(languageVersionSettings) ->
-                return irCall(callSite, context.coroutineSuspendOrReturn)
-            callSite.symbol == context.intrinsics.jsCoroutineContext ->
-                return irCall(callSite, context.coroutineGetContextJs)
+            expression.symbol.descriptor.isBuiltInSuspendCoroutineUninterceptedOrReturn(languageVersionSettings) ->
+                return irCall(expression, context.coroutineSuspendOrReturn)
+            expression.symbol == context.intrinsics.jsCoroutineContext ->
+                return irCall(expression, context.coroutineGetContextJs)
         }
 
-        val callee = getFunctionDeclaration(callSite.symbol)                   // Get declaration of the function to be inlined.
+        val callee = getFunctionDeclaration(expression.symbol)                   // Get declaration of the function to be inlined.
         callee.transformChildrenVoid(this)                            // Process recursive inline.
 
         val parent = allScopes.map { it.irElement }.filterIsInstance<IrDeclarationParent>().lastOrNull()
-        val inliner = Inliner(callSite, callee, currentScope!!, parent, context)
+        val inliner = Inliner(expression, callee, currentScope!!, parent, context)
         return inliner.inline()
     }
 

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/JvmLower.kt

@@ -38,6 +38,12 @@ private fun makePatchParentsPhase(number: Int) = namedIrFilePhase(
     nlevels = 0
 )
 
+private val arrayConstructorPhase = makeIrFilePhase(
+    ::ArrayConstructorLowering,
+    name = "ArrayConstructor",
+    description = "Transform `Array(size) { index -> value }` into a loop"
+)
+
 private val expectDeclarationsRemovingPhase = makeIrFilePhase(
     ::ExpectDeclarationsRemoving,
     name = "ExpectDeclarationsRemoving",
@@ -61,6 +67,7 @@ val jvmPhases = namedIrFilePhase<JvmBackendContext>(
     lower = expectDeclarationsRemovingPhase then
             fileClassPhase then
             kCallableNamePropertyPhase then
+            arrayConstructorPhase then
 
             jvmLateinitPhase then
 

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/ExpressionCodegen.kt

@@ -19,13 +19,11 @@ import org.jetbrains.kotlin.codegen.inline.ReifiedTypeInliner.OperationKind.SAFE
 import org.jetbrains.kotlin.codegen.pseudoInsns.fakeAlwaysFalseIfeq
 import org.jetbrains.kotlin.codegen.pseudoInsns.fixStackAndJump
 import org.jetbrains.kotlin.codegen.signature.BothSignatureWriter
-import org.jetbrains.kotlin.codegen.state.GenerationState
 import org.jetbrains.kotlin.config.isReleaseCoroutines
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.expressions.*
-import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
 import org.jetbrains.kotlin.ir.symbols.IrSymbol
 import org.jetbrains.kotlin.ir.symbols.IrTypeParameterSymbol
 import org.jetbrains.kotlin.ir.types.*
@@ -246,64 +244,30 @@ class ExpressionCodegen(
     override fun visitContainerExpression(expression: IrContainerExpression, data: BlockInfo) =
         visitStatementContainer(expression, data).coerce(expression.asmType)
 
-    override fun visitDelegatingConstructorCall(expression: IrDelegatingConstructorCall, data: BlockInfo): PromisedValue {
+    override fun visitFunctionAccess(expression: IrFunctionAccessExpression, data: BlockInfo): PromisedValue {
         expression.markLineNumber(startOffset = true)
-        mv.load(0, OBJECT_TYPE) // HACK
-        return generateCall(expression, null, data)
-    }
-
-    override fun visitCall(expression: IrCall, data: BlockInfo): PromisedValue {
-        expression.markLineNumber(startOffset = true)
-        if (expression.symbol.owner is IrConstructor) {
-            throw AssertionError("IrCall with ConstructorDescriptor: ${expression.javaClass.simpleName}")
-        }
-        return generateCall(expression, expression.superQualifierSymbol, data)
-    }
-
-    override fun visitConstructorCall(expression: IrConstructorCall, data: BlockInfo): PromisedValue {
-        val type = expression.asmType
-        if (type.sort == Type.ARRAY) {
-            //noinspection ConstantConditions
-            return generateNewArray(expression, data)
-        }
-
-        mv.anew(expression.asmType)
-        mv.dup()
-        generateCall(expression, null, data)
-        return expression.onStack
-    }
-
-    private fun generateNewArray(expression: IrConstructorCall, data: BlockInfo): PromisedValue {
-        val args = expression.symbol.owner.valueParameters
-        assert(args.size == 1 || args.size == 2) { "Unknown constructor called: " + args.size + " arguments" }
-
-        if (args.size == 1) {
-            // TODO move to the intrinsic
-            expression.getValueArgument(0)!!.accept(this, data).coerce(Type.INT_TYPE).materialize()
-            newArrayInstruction(expression.type)
-            return expression.onStack
-        }
-
-        return generateCall(expression, null, data)
-    }
-
-    private fun generateCall(expression: IrFunctionAccessExpression, superQualifierSymbol: IrClassSymbol?, data: BlockInfo): PromisedValue {
         classCodegen.context.irIntrinsics.getIntrinsic(expression.symbol)
             ?.invoke(expression, this, data)?.let { return it.coerce(expression.asmType) }
-        val isSuperCall = superQualifierSymbol != null
-        val callable = resolveToCallable(expression, isSuperCall)
-        return generateCall(expression, callable, data, isSuperCall)
-    }
 
-    fun generateCall(
-        expression: IrFunctionAccessExpression,
-        callable: Callable,
-        data: BlockInfo,
-        isSuperCall: Boolean = false
-    ): PromisedValue {
+        val isSuperCall = (expression as? IrCall)?.superQualifier != null
+        val callable = resolveToCallable(expression, isSuperCall)
         val callee = expression.symbol.owner
         val callGenerator = getOrCreateCallGenerator(expression, data)
 
+        when {
+            expression is IrConstructorCall -> {
+                // IR constructors have no receiver and return the new instance, but on JVM they are void-returning
+                // instance methods named <init>.
+                mv.anew(expression.asmType)
+                mv.dup()
+            }
+            expression is IrDelegatingConstructorCall ->
+                // In this case the receiver is `this` (not specified in IR) and the return value is discarded anyway.
+                mv.load(0, OBJECT_TYPE)
+            expression.descriptor is ConstructorDescriptor ->
+                throw AssertionError("IrCall with ConstructorDescriptor: ${expression.javaClass.simpleName}")
+        }
+
         val receiver = expression.dispatchReceiver
         receiver?.apply {
             callGenerator.genValueAndPut(
@@ -374,17 +338,19 @@ class ExpressionCodegen(
         )
 
         val returnType = callee.returnType.substitute(typeSubstitutionMap)
-        if (returnType.isNothing()) {
-            mv.aconst(null)
-            mv.athrow()
-            return voidValue
-        } else if (callee is IrConstructor) {
-            return voidValue
-        } else if (expression.type.isUnit()) {
-            // NewInference allows casting `() -> T` to `() -> Unit`. A CHECKCAST here will fail.
-            return MaterialValue(mv, callable.returnType).discard().coerce(expression.asmType)
+        return when {
+            returnType.isNothing() -> {
+                mv.aconst(null)
+                mv.athrow()
+                voidValue
+            }
+            expression is IrConstructorCall -> expression.onStack
+            expression is IrDelegatingConstructorCall -> voidValue
+            expression.type.isUnit() ->
+                // NewInference allows casting `() -> T` to `() -> Unit`. A CHECKCAST here will fail.
+                MaterialValue(mv, callable.returnType).discard().coerce(expression.asmType)
+            else -> MaterialValue(mv, callable.returnType).coerce(expression.asmType)
         }
-        return MaterialValue(mv, callable.returnType).coerce(expression.asmType)
     }
 
     override fun visitVariable(declaration: IrVariable, data: BlockInfo): PromisedValue {
@@ -1040,50 +1006,23 @@ class ExpressionCodegen(
         return typeMapper.mapToCallableMethod(irCall.symbol.owner, isSuper)
     }
 
-    private fun getOrCreateCallGenerator(
-        irFunction: IrFunction,
-        element: IrMemberAccessExpression?,
-        typeParameterMappings: IrTypeParameterMappings?,
-        isDefaultCompilation: Boolean,
-        data: BlockInfo
-    ): IrCallGenerator {
-        if (element == null) return IrCallGenerator.DefaultCallGenerator
-
-        // We should inline callable containing reified type parameters even if inline is disabled
-        // because they may contain something to reify and straight call will probably fail at runtime
-        val isInline = irFunction.isInlineCall(state)
-
-        if (!isInline) return IrCallGenerator.DefaultCallGenerator
-
-        val original = (irFunction as? IrSimpleFunction)?.resolveFakeOverride() ?: irFunction
-        return if (isDefaultCompilation) {
-            TODO()
-        } else {
-            IrInlineCodegen(this, state, original.descriptor, typeParameterMappings!!, IrSourceCompilerForInline(state, element, this, data))
+    private fun getOrCreateCallGenerator(element: IrFunctionAccessExpression, data: BlockInfo): IrCallGenerator {
+        if (!element.symbol.owner.isInlineFunctionCall(context)) {
+            return IrCallGenerator.DefaultCallGenerator
         }
-    }
 
-    private fun getOrCreateCallGenerator(
-        functionAccessExpression: IrFunctionAccessExpression,
-        data: BlockInfo
-    ): IrCallGenerator {
-        val callee = functionAccessExpression.symbol.owner
+        val callee = element.symbol.owner
         val typeArgumentContainer = if (callee is IrConstructor) callee.parentAsClass else callee
         val typeArguments =
-            if (functionAccessExpression.typeArgumentsCount == 0) {
+            if (element.typeArgumentsCount == 0) {
                 //avoid ambiguity with type constructor type parameters
                 emptyMap()
             } else typeArgumentContainer.typeParameters.keysToMap {
-                functionAccessExpression.getTypeArgumentOrDefault(it)
+                element.getTypeArgumentOrDefault(it)
             }
 
         val mappings = IrTypeParameterMappings()
-        for (entry in typeArguments.entries) {
-            val key = entry.key
-            val type = entry.value
-
-            val isReified = key.isReified || callee.isArrayConstructorWithLambda()
-
+        for ((key, type) in typeArguments.entries) {
             val reificationArgument = extractReificationArgument(type)
             if (reificationArgument == null) {
                 // type is not generic
@@ -1091,16 +1030,17 @@ class ExpressionCodegen(
                 val asmType = typeMapper.mapTypeParameter(type, signatureWriter)
 
                 mappings.addParameterMappingToType(
-                    key.name.identifier, type, asmType, signatureWriter.toString(), isReified
+                    key.name.identifier, type, asmType, signatureWriter.toString(), key.isReified
                 )
             } else {
                 mappings.addParameterMappingForFurtherReification(
-                    key.name.identifier, type, reificationArgument, isReified
+                    key.name.identifier, type, reificationArgument, key.isReified
                 )
             }
         }
 
-        return getOrCreateCallGenerator(callee, functionAccessExpression, mappings, false, data)
+        val original = (callee as? IrSimpleFunction)?.resolveFakeOverride() ?: irFunction
+        return IrInlineCodegen(this, state, original.descriptor, mappings, IrSourceCompilerForInline(state, element, this, data))
     }
 
     override fun consumeReifiedOperationMarker(typeParameterDescriptor: TypeParameterDescriptor) {
@@ -1213,21 +1153,9 @@ fun DefaultCallArgs.generateOnStackIfNeeded(callGenerator: IrCallGenerator, isCo
     return toInts.isNotEmpty()
 }
 
-internal fun IrFunction.isInlineCall(state: GenerationState) =
-    (!state.isInlineDisabled || containsReifiedTypeParameters()) &&
-            (isInline || isArrayConstructorWithLambda())
-
 val IrType.isReifiedTypeParameter: Boolean
     get() = this.classifierOrNull?.safeAs<IrTypeParameterSymbol>()?.owner?.isReified == true
 
-/* Copied and modified from InlineUtil.java */
-fun isInline(declaration: IrDeclaration?): Boolean = declaration is IrSimpleFunction && declaration.isInline
-
-fun IrFunction.containsReifiedTypeParameters(): Boolean =
-    typeParameters.any { it.isReified }
-
-fun IrClass.isArrayOrPrimitiveArray() = this.defaultType.let { it.isArray() || it.isPrimitiveArray() }
-
 /* From typeUtil.java */
 fun IrType.getTypeParameterOrNull() = classifierOrNull?.owner?.safeAs<IrTypeParameter>()
 

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/IrInlineCodegen.kt

@@ -165,8 +165,7 @@ fun isInlineIrExpression(argumentExpression: IrExpression) =
             (argumentExpression.origin == IrStatementOrigin.LAMBDA || argumentExpression.origin == IrStatementOrigin.ANONYMOUS_FUNCTION)
 
 fun IrFunction.isInlineFunctionCall(context: JvmBackendContext) =
-    (!context.state.isInlineDisabled || typeParameters.any { it.isReified }) &&
-            (isInline || isArrayConstructorWithLambda())
+    (!context.state.isInlineDisabled || typeParameters.any { it.isReified }) && isInline
 
 fun IrValueParameter.isInlineParameter() =
     !isNoinline && !type.isNullable() && type.isFunctionOrKFunction()

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/irCodegenUtils.kt

@@ -89,15 +89,6 @@ fun JvmBackendContext.getSourceMapper(declaration: IrClass): DefaultSourceMapper
 val IrType.isExtensionFunctionType: Boolean
     get() = isFunctionTypeOrSubtype() && hasAnnotation(KotlinBuiltIns.FQ_NAMES.extensionFunctionType)
 
-/**
- * @return true if the function is a constructor of one of 9 array classes (Array<T>, IntArray, FloatArray, ...)
- * which takes the size and an initializer lambda as parameters. Such constructors are marked as 'inline' but they are not loaded
- * as such because the 'inline' flag is not stored for constructors in the binary metadata. Therefore we pretend that they are inline
- */
-fun IrFunction.isArrayConstructorWithLambda(): Boolean = this is IrConstructor &&
-        valueParameters.size == 2 &&
-        parentAsClass.isArrayOrPrimitiveArray()
-
 
 /* Borrowed from MemberCodegen.java */
 

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/intrinsics/ArrayConstructor.kt

@@ -1,43 +0,0 @@
-/*
- * Copyright 2010-2016 JetBrains s.r.o.
- *
- * 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 org.jetbrains.kotlin.backend.jvm.intrinsics
-
-import org.jetbrains.kotlin.backend.jvm.JvmBackendContext
-import org.jetbrains.kotlin.backend.jvm.codegen.BlockInfo
-import org.jetbrains.kotlin.backend.jvm.codegen.ExpressionCodegen
-import org.jetbrains.kotlin.codegen.StackValue
-import org.jetbrains.kotlin.ir.expressions.IrFunctionAccessExpression
-import org.jetbrains.kotlin.resolve.jvm.AsmTypes
-import org.jetbrains.kotlin.resolve.jvm.jvmSignature.JvmMethodSignature
-import org.jetbrains.org.objectweb.asm.Type
-import org.jetbrains.org.objectweb.asm.commons.InstructionAdapter
-
-object ArrayConstructor : IntrinsicMethod() {
-    override fun toCallable(
-        expression: IrFunctionAccessExpression,
-        signature: JvmMethodSignature,
-        context: JvmBackendContext
-    ): IrIntrinsicFunction {
-        return object : IrIntrinsicFunction(expression, signature, context, expression.argTypes(context)) {
-
-            override fun invoke(v: InstructionAdapter, codegen: ExpressionCodegen, data: BlockInfo): StackValue {
-                codegen.generateCall(expression, this, data).materialize()
-                return StackValue.onStack(Type.getObjectType("[" + AsmTypes.OBJECT_TYPE.internalName))
-            }
-        }
-    }
-}

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/intrinsics/IrIntrinsicMethods.kt

@@ -213,9 +213,9 @@ class IrIntrinsicMethods(val irBuiltIns: IrBuiltIns, val symbols: JvmSymbols) {
             }
 
         private fun arrayMethods(arrayClass: IrClassSymbol) = listOf(
-            arrayClass.constructors.single { it.owner.valueParameters.size == 2 }.toKey()!! to ArrayConstructor,
             arrayClass.owner.properties.single { it.name.asString() == "size" }.getter!!.symbol.toKey()!! to ArraySize
         ) +
+                arrayClass.constructors.filter { it.owner.valueParameters.size == 1 }.map { it.toKey()!! to NewArray } +
                 methodWithArity(arrayClass, "set", 2, ArraySet) +
                 methodWithArity(arrayClass, "get", 1, ArrayGet) +
                 methodWithArity(arrayClass, "clone", 0, Clone) +

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/intrinsics/NewArray.kt

@@ -6,30 +6,15 @@
 package org.jetbrains.kotlin.backend.jvm.intrinsics
 
 import org.jetbrains.kotlin.backend.jvm.codegen.BlockInfo
-import org.jetbrains.kotlin.backend.jvm.JvmBackendContext
 import org.jetbrains.kotlin.backend.jvm.codegen.ExpressionCodegen
-import org.jetbrains.kotlin.codegen.StackValue
+import org.jetbrains.kotlin.backend.jvm.codegen.PromisedValue
 import org.jetbrains.kotlin.ir.expressions.IrFunctionAccessExpression
-import org.jetbrains.kotlin.resolve.jvm.jvmSignature.JvmMethodSignature
-import org.jetbrains.org.objectweb.asm.commons.InstructionAdapter
+import org.jetbrains.org.objectweb.asm.Type
 
 object NewArray : IntrinsicMethod() {
-
-    override fun toCallable(
-        expression: IrFunctionAccessExpression,
-        signature: JvmMethodSignature,
-        context: JvmBackendContext
-    ): IrIntrinsicFunction {
-        val irType = expression.type
-        return object : IrIntrinsicFunction(expression, signature, context) {
-            override fun invoke(v: InstructionAdapter, codegen: ExpressionCodegen, data: BlockInfo): StackValue {
-                super.invoke(v, codegen, data)
-                codegen.newArrayInstruction(irType)
-                return StackValue.onStack(returnType)
-            }
-
-            override fun genInvokeInstruction(v: InstructionAdapter) {
-            }
-        }
+    override fun invoke(expression: IrFunctionAccessExpression, codegen: ExpressionCodegen, data: BlockInfo): PromisedValue? {
+        codegen.gen(expression.getValueArgument(0)!!, Type.INT_TYPE, data)
+        codegen.newArrayInstruction(expression.type)
+        return with(codegen) { expression.onStack }
     }
 }

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/builders/ExpressionHelpers.kt

@@ -253,7 +253,7 @@ fun IrBuilderWithScope.irCall(callee: IrSimpleFunctionSymbol, type: IrType): IrC
 fun IrBuilderWithScope.irCall(callee: IrConstructorSymbol, type: IrType): IrConstructorCall =
     IrConstructorCallImpl.fromSymbolDescriptor(startOffset, endOffset, type, callee)
 
-fun IrBuilderWithScope.irCall(callee: IrFunctionSymbol, type: IrType): IrMemberAccessExpression =
+fun IrBuilderWithScope.irCall(callee: IrFunctionSymbol, type: IrType): IrFunctionAccessExpression =
     when (callee) {
         is IrConstructorSymbol -> irCall(callee, type)
         is IrSimpleFunctionSymbol -> irCall(callee, type)
@@ -266,13 +266,13 @@ fun IrBuilderWithScope.irCall(callee: IrSimpleFunctionSymbol): IrCall =
 fun IrBuilderWithScope.irCall(callee: IrConstructorSymbol): IrConstructorCall =
     irCall(callee, callee.owner.returnType)
 
-fun IrBuilderWithScope.irCall(callee: IrFunctionSymbol): IrMemberAccessExpression =
+fun IrBuilderWithScope.irCall(callee: IrFunctionSymbol): IrFunctionAccessExpression =
     irCall(callee, callee.owner.returnType)
 
 fun IrBuilderWithScope.irCall(callee: IrFunctionSymbol, descriptor: FunctionDescriptor, type: IrType): IrCall =
     IrCallImpl(startOffset, endOffset, type, callee as IrSimpleFunctionSymbol, descriptor)
 
-fun IrBuilderWithScope.irCall(callee: IrFunction): IrMemberAccessExpression =
+fun IrBuilderWithScope.irCall(callee: IrFunction): IrFunctionAccessExpression =
     irCall(callee.symbol)
 
 fun IrBuilderWithScope.irCall(callee: IrFunction, origin: IrStatementOrigin): IrCall =

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/descriptors/IrBuiltIns.kt

@@ -183,6 +183,8 @@ class IrBuiltIns(
     val primitiveTypes = listOf(bool, char, byte, short, int, long, float, double)
     val primitiveTypesWithComparisons = listOf(char, byte, short, int, long, float, double)
     val primitiveFloatingPointTypes = listOf(float, double)
+    val primitiveArrays = PrimitiveType.values().map { builtIns.getPrimitiveArrayClassDescriptor(it).toIrSymbol() }
+    val primitiveArrayElementTypes = primitiveArrays.zip(primitiveIrTypes).toMap()
 
     val primitiveTypeToIrType = mapOf(
         PrimitiveType.BOOLEAN to booleanType,

libraries/stdlib/js-ir/builtins/Arrays.kt

@@ -41,6 +41,12 @@ public class ByteArray(size: Int) {
  * @constructor Creates a new array of the specified [size], with all elements initialized to null char (`\u0000').
  */
 public class CharArray(size: Int) {
+    /**
+     * Creates a new array of the specified [size], where each element is calculated by calling the specified
+     * [init] function. The [init] function returns an array element given its index.
+     */
+    public inline constructor(size: Int, init: (Int) -> Char)
+
     /** Returns the array element at the given [index]. This method can be called using the index operator. */
     public operator fun get(index: Int): Char
     /** Sets the element at the given [index] to the given [value]. This method can be called using the index operator. */
@@ -53,17 +59,6 @@ public class CharArray(size: Int) {
     public operator fun iterator(): CharIterator
 }
 
-@kotlin.internal.InlineOnly
-public inline fun CharArray(size: Int, init: (Int) -> Char): CharArray {
-    val result = CharArray(size)
-    var i = 0
-    while (i != result.size) {
-        result[i] = init(i)
-        ++i
-    }
-    return result
-}
-
 /**
  * An array of shorts. When targeting the JVM, instances of this class are represented as `short[]`.
  * @constructor Creates a new array of the specified [size], with all elements initialized to zero.