[JS IR BE] Add intrinsics for hashCode on primitive number types

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 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.
  */
 
@@ -15,20 +15,17 @@ import org.jetbrains.kotlin.ir.declarations.IrProperty
 import org.jetbrains.kotlin.ir.declarations.IrSimpleFunction
 import org.jetbrains.kotlin.ir.declarations.impl.IrExternalPackageFragmentImpl
 import org.jetbrains.kotlin.ir.descriptors.IrBuiltIns
-import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
 import org.jetbrains.kotlin.ir.symbols.IrSimpleFunctionSymbol
 import org.jetbrains.kotlin.ir.symbols.impl.IrExternalPackageFragmentSymbolImpl
 import org.jetbrains.kotlin.ir.types.IrType
 import org.jetbrains.kotlin.ir.types.defaultType
 import org.jetbrains.kotlin.ir.types.isLong
-import org.jetbrains.kotlin.ir.util.companionObject
 import org.jetbrains.kotlin.ir.util.constructors
 import org.jetbrains.kotlin.ir.util.findDeclaration
 import org.jetbrains.kotlin.ir.util.kotlinPackageFqn
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.psi2ir.findSingleFunction
-import org.jetbrains.kotlin.types.Variance
 import org.jetbrains.kotlin.util.capitalizeDecapitalize.toLowerCaseAsciiOnly
 import java.util.*
 
@@ -146,6 +143,7 @@ class JsIntrinsics(private val irBuiltIns: IrBuiltIns, val context: JsIrBackendC
     val jsObjectCreate = defineObjectCreateIntrinsic() // Object.create
     val jsCode = getInternalFunction("js") // js("<code>")
     val jsHashCode = getInternalFunction("hashCode")
+    val jsGetNumberHashCode = getInternalFunction("getNumberHashCode")
     val jsGetObjectHashCode = getInternalFunction("getObjectHashCode")
     val jsToString = getInternalFunction("toString")
     val jsAnyToString = getInternalFunction("anyToString")

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 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.
  */
 
@@ -56,6 +56,7 @@ class NumberOperatorCallsTransformer(context: JsIrBackendContext) : CallsTransfo
 
         for (type in primitiveNumbers) {
             add(type, Name.identifier("rangeTo"), ::transformRangeTo)
+            add(type, Name.identifier("hashCode"), ::transformHashCode)
         }
 
         for (type in primitiveNumbers) {
@@ -97,6 +98,19 @@ class NumberOperatorCallsTransformer(context: JsIrBackendContext) : CallsTransfo
         }
     }
 
+    private fun transformHashCode(call: IrFunctionAccessExpression): IrExpression {
+        return with(call.symbol.owner.dispatchReceiverParameter!!.type) {
+            when {
+                isByte() || isShort() || isInt() ->
+                    call.dispatchReceiver!!
+                isFloat() || isDouble() ->
+                    // TODO introduce doubleToHashCode?
+                    irCall(call, intrinsics.jsGetNumberHashCode, receiversAsArguments = true)
+                else -> call
+            }
+        }
+    }
+
     private fun irBinaryOp(
         call: IrFunctionAccessExpression,
         intrinsic: IrFunctionSymbol,