Simplify binary operation intrinsics

Having to invoke `exist` so prevent a runtime exception
is no better then trying to invoke a method on a null
reference. It is actually worse, because Kotlin type
system handles the latter.

js/js.translator/src/org/jetbrains/kotlin/js/translate/intrinsic/Intrinsics.kt

@@ -35,7 +35,7 @@ class Intrinsics {
     private val binaryOperationIntrinsics = BinaryOperationIntrinsics()
     private val objectIntrinsics = ObjectIntrinsics()
 
-    fun getBinaryOperationIntrinsic(expression: KtBinaryExpression, context: TranslationContext): BinaryOperationIntrinsic {
+    fun getBinaryOperationIntrinsic(expression: KtBinaryExpression, context: TranslationContext): BinaryOperationIntrinsic? {
         return binaryOperationIntrinsics.getIntrinsic(expression, context)
     }
 

js/js.translator/src/org/jetbrains/kotlin/js/translate/intrinsic/functions/FunctionIntrinsics.java

@@ -23,7 +23,6 @@ import org.jetbrains.annotations.Nullable;
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor;
 import org.jetbrains.kotlin.js.translate.intrinsic.functions.basic.FunctionIntrinsic;
 import org.jetbrains.kotlin.js.translate.intrinsic.functions.factories.*;
-import org.jetbrains.kotlin.js.translate.intrinsic.operation.StringPlusCharFIF;
 
 import java.util.List;
 import java.util.Map;

js/js.translator/src/org/jetbrains/kotlin/js/translate/intrinsic/functions/factories/StringPlusCharFIF.kt

@@ -1,20 +1,9 @@
 /*
- * Copyright 2010-2016 JetBrains s.r.o.
+ * Copyright 2000-2018 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.
- * 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.js.translate.intrinsic.operation
+package org.jetbrains.kotlin.js.translate.intrinsic.functions.factories
 
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor
@@ -24,8 +13,6 @@ import org.jetbrains.kotlin.js.backend.ast.JsExpression
 import org.jetbrains.kotlin.js.translate.callTranslator.CallInfo
 import org.jetbrains.kotlin.js.translate.context.TranslationContext
 import org.jetbrains.kotlin.js.translate.intrinsic.functions.basic.FunctionIntrinsic
-import org.jetbrains.kotlin.js.translate.intrinsic.functions.factories.FunctionIntrinsicFactory
-import org.jetbrains.kotlin.js.translate.intrinsic.functions.factories.TopLevelFIF
 import org.jetbrains.kotlin.js.translate.utils.JsAstUtils
 import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameUnsafe
 import org.jetbrains.kotlin.types.TypeUtils

js/js.translator/src/org/jetbrains/kotlin/js/translate/intrinsic/operation/AssignmentBOIF.kt

@@ -31,7 +31,7 @@ import org.jetbrains.kotlin.types.KotlinType
 
 object AssignmentBOIF : BinaryOperationIntrinsicFactory {
 
-    private object CharAssignmentIntrinsic : AbstractBinaryOperationIntrinsic() {
+    private object CharAssignmentIntrinsic : BinaryOperationIntrinsic {
         override fun apply(expression: KtBinaryExpression, left: JsExpression, right: JsExpression, context: TranslationContext): JsExpression {
             val operator = OperatorTable.getBinaryOperator(PsiUtils.getOperationToken(expression))
             return JsBinaryOperation(operator, left, TranslationUtils.charToBoxedChar(context, right))

js/js.translator/src/org/jetbrains/kotlin/js/translate/intrinsic/operation/CompareToBOIF.kt

@@ -32,28 +32,28 @@ import org.jetbrains.kotlin.types.KotlinType
 import org.jetbrains.kotlin.types.expressions.OperatorConventions
 
 object CompareToBOIF : BinaryOperationIntrinsicFactory {
-    private object CompareToIntrinsic : AbstractBinaryOperationIntrinsic() {
+    private object CompareToIntrinsic : BinaryOperationIntrinsic {
         override fun apply(expression: KtBinaryExpression, left: JsExpression, right: JsExpression, context: TranslationContext): JsExpression {
             val operator = OperatorTable.getBinaryOperator(getOperationToken(expression))
             return JsBinaryOperation(operator, left, right)
         }
     }
 
-    private object CompareToCharIntrinsic : AbstractBinaryOperationIntrinsic() {
+    private object CompareToCharIntrinsic : BinaryOperationIntrinsic {
         override fun apply(expression: KtBinaryExpression, left: JsExpression, right: JsExpression, context: TranslationContext): JsExpression {
             val operator = OperatorTable.getBinaryOperator(getOperationToken(expression))
             return JsBinaryOperation(operator, left, JsAstUtils.charToInt(right))
         }
     }
 
-    private object CompareCharToPrimitiveIntrinsic : AbstractBinaryOperationIntrinsic() {
+    private object CompareCharToPrimitiveIntrinsic : BinaryOperationIntrinsic {
         override fun apply(expression: KtBinaryExpression, left: JsExpression, right: JsExpression, context: TranslationContext): JsExpression {
             val operator = OperatorTable.getBinaryOperator(getOperationToken(expression))
             return JsBinaryOperation(operator, JsAstUtils.charToInt(left), right)
         }
     }
 
-    private object CompareToFunctionIntrinsic : AbstractBinaryOperationIntrinsic() {
+    private object CompareToFunctionIntrinsic : BinaryOperationIntrinsic{
         override fun apply(expression: KtBinaryExpression, left: JsExpression, right: JsExpression, context: TranslationContext): JsExpression {
             val operator = OperatorTable.getBinaryOperator(getOperationToken(expression))
             val compareTo = JsAstUtils.compareTo(left, right)

js/js.translator/src/org/jetbrains/kotlin/js/translate/intrinsic/operation/EqualsBOIF.kt

@@ -40,7 +40,7 @@ import org.jetbrains.kotlin.types.typeUtil.makeNullable
 import java.util.*
 
 object EqualsBOIF : BinaryOperationIntrinsicFactory {
-    private object EqualsIntrinsic : AbstractBinaryOperationIntrinsic() {
+    private object EqualsIntrinsic : BinaryOperationIntrinsic {
 
         private val JS_NUMBER_PRIMITIVES =
             EnumSet.of(PrimitiveType.BYTE, PrimitiveType.SHORT, PrimitiveType.INT, PrimitiveType.DOUBLE, PrimitiveType.FLOAT)
@@ -99,7 +99,7 @@ object EqualsBOIF : BinaryOperationIntrinsicFactory {
         }
     }
 
-    object EnumEqualsIntrinsic : AbstractBinaryOperationIntrinsic() {
+    object EnumEqualsIntrinsic : BinaryOperationIntrinsic {
         override fun apply(expression: KtBinaryExpression, left: JsExpression, right: JsExpression, context: TranslationContext): JsBinaryOperation {
             val operator = if (expression.isNegated()) JsBinaryOperator.REF_NEQ else JsBinaryOperator.REF_EQ
             return JsBinaryOperation(operator, left, right)
@@ -112,11 +112,11 @@ object EqualsBOIF : BinaryOperationIntrinsicFactory {
             when {
                 isEnumIntrinsicApplicable(descriptor, leftType, rightType) -> EnumEqualsIntrinsic
 
-                KotlinBuiltIns.isBuiltIn(descriptor) ||
+            KotlinBuiltIns.isBuiltIn(descriptor) ||
-                TopLevelFIF.EQUALS_IN_ANY.test(descriptor) -> EqualsIntrinsic
+                    TopLevelFIF.EQUALS_IN_ANY.test(descriptor) -> EqualsIntrinsic
 
-                else -> null
+            else -> null
-            }
+        }
 
     private fun isEnumIntrinsicApplicable(descriptor: FunctionDescriptor, leftType: KotlinType?, rightType: KotlinType?): Boolean {
         return DescriptorUtils.isEnumClass(descriptor.containingDeclaration) && leftType != null && rightType != null &&

js/js.translator/src/org/jetbrains/kotlin/js/translate/intrinsic/operation/LongCompareToBOIF.kt

@@ -42,21 +42,21 @@ object LongCompareToBOIF : BinaryOperationIntrinsicFactory {
     val LONG_COMPARE_TO_CHAR_PATTERN = pattern("Long.compareTo(Char)")
     val LONG_COMPARE_TO_LONG_PATTERN = pattern("Long.compareTo(Long)")
 
-    private object FLOATING_POINT_COMPARE_TO_LONG : AbstractBinaryOperationIntrinsic() {
+    private object FLOATING_POINT_COMPARE_TO_LONG : BinaryOperationIntrinsic {
         override fun apply(expression: KtBinaryExpression, left: JsExpression, right: JsExpression, context: TranslationContext): JsExpression {
             val operator = OperatorTable.getBinaryOperator(getOperationToken(expression))
             return JsBinaryOperation(operator, left, invokeMethod(right, Namer.LONG_TO_NUMBER))
         }
     }
 
-    private object LONG_COMPARE_TO_FLOATING_POINT : AbstractBinaryOperationIntrinsic() {
+    private object LONG_COMPARE_TO_FLOATING_POINT : BinaryOperationIntrinsic {
         override fun apply(expression: KtBinaryExpression, left: JsExpression, right: JsExpression, context: TranslationContext): JsExpression {
             val operator = OperatorTable.getBinaryOperator(getOperationToken(expression))
             return JsBinaryOperation(operator, invokeMethod(left, Namer.LONG_TO_NUMBER), right)
         }
     }
 
-    private class CompareToBinaryIntrinsic(val toLeft: (JsExpression) -> JsExpression, val toRight: (JsExpression) -> JsExpression) : AbstractBinaryOperationIntrinsic() {
+    private class CompareToBinaryIntrinsic(val toLeft: (JsExpression) -> JsExpression, val toRight: (JsExpression) -> JsExpression) : BinaryOperationIntrinsic {
         override fun apply(expression: KtBinaryExpression, left: JsExpression, right: JsExpression, context: TranslationContext): JsExpression {
             val operator = OperatorTable.getBinaryOperator(getOperationToken(expression))
             val compareInvocation = compareForObject(toLeft(left), toRight(right))

js/js.translator/src/org/jetbrains/kotlin/js/translate/intrinsic/operation/binaryOperationIntrinsics.kt

@@ -26,46 +26,47 @@ import org.jetbrains.kotlin.js.translate.utils.getPrimitiveNumericComparisonInfo
 import org.jetbrains.kotlin.lexer.KtToken
 import org.jetbrains.kotlin.psi.KtBinaryExpression
 import org.jetbrains.kotlin.types.KotlinType
+import org.jetbrains.kotlin.utils.addToStdlib.firstNotNullResult
 
 interface BinaryOperationIntrinsic {
-
     fun apply(expression: KtBinaryExpression, left: JsExpression, right: JsExpression, context: TranslationContext): JsExpression
-
-    fun exists(): Boolean
 }
 
 class BinaryOperationIntrinsics {
 
-    private val intrinsicCache = mutableMapOf<IntrinsicKey, BinaryOperationIntrinsic>()
+    private data class IntrinsicKey(
+        val token: KtToken,
+        val function: FunctionDescriptor,
+        val leftType: KotlinType?,
+        val rightType: KotlinType?
+    )
 
-    private val factories = listOf(LongCompareToBOIF, EqualsBOIF, CompareToBOIF, AssignmentBOIF)
+    private val intrinsicCache = mutableMapOf<IntrinsicKey, BinaryOperationIntrinsic?>()
 
-    fun getIntrinsic(expression: KtBinaryExpression, context: TranslationContext): BinaryOperationIntrinsic {
+    fun getIntrinsic(expression: KtBinaryExpression, context: TranslationContext): BinaryOperationIntrinsic? {
-        val token = getOperationToken(expression)
+        val descriptor = getCallableDescriptorForOperationExpression(context.bindingContext(), expression) as? FunctionDescriptor ?: return null
-        val descriptor = getCallableDescriptorForOperationExpression(context.bindingContext(), expression)
-        if (descriptor == null || descriptor !is FunctionDescriptor) {
-            return NO_INTRINSIC
-        }
 
         val (leftType, rightType) = binaryOperationTypes(expression, context)
 
-        val key = IntrinsicKey(token, descriptor, leftType, rightType)
+        val token = getOperationToken(expression)
-        return intrinsicCache.getOrPut(key) { computeIntrinsic(token, descriptor, leftType, rightType) }
+
+        return computeAndCache(IntrinsicKey(token, descriptor, leftType, rightType))
     }
 
-    private fun computeIntrinsic(
+    private val factories = listOf(LongCompareToBOIF, EqualsBOIF, CompareToBOIF, AssignmentBOIF)
-            token: KtToken, descriptor: FunctionDescriptor,
+
-            leftType: KotlinType?, rightType: KotlinType?
+    private fun computeAndCache(key: IntrinsicKey): BinaryOperationIntrinsic? {
-    ): BinaryOperationIntrinsic {
+        if (key in intrinsicCache) return intrinsicCache[key]
-        for (factory in factories) {
+
-            if (factory.getSupportTokens().contains(token)) {
+        val result = factories.firstNotNullResult { factory ->
-                val intrinsic = factory.getIntrinsic(descriptor, leftType, rightType)
+            if (factory.getSupportTokens().contains(key.token)) {
-                if (intrinsic != null) {
+                factory.getIntrinsic(key.function, key.leftType, key.rightType)
-                    return intrinsic
+            } else null
-                }
-            }
         }
-        return NO_INTRINSIC
+
+        intrinsicCache[key] = result
+
+        return result
     }
 }
 
@@ -78,28 +79,9 @@ fun binaryOperationTypes(expression: KtBinaryExpression, context: TranslationCon
     return expression.left?.let { context.getPrecisePrimitiveType(it) } to expression.right?.let { context.getPrecisePrimitiveType(it) }
 }
 
-private data class IntrinsicKey(
-        val token: KtToken, val function: FunctionDescriptor,
-        val leftType: KotlinType?, val rightType: KotlinType?
-)
-
 interface BinaryOperationIntrinsicFactory {
 
     fun getSupportTokens(): Set<KtToken>
 
     fun getIntrinsic(descriptor: FunctionDescriptor, leftType: KotlinType?, rightType: KotlinType?): BinaryOperationIntrinsic?
 }
-
-abstract class AbstractBinaryOperationIntrinsic : BinaryOperationIntrinsic {
-
-    override abstract fun apply(expression: KtBinaryExpression, left: JsExpression, right: JsExpression, context: TranslationContext): JsExpression
-
-    override fun exists(): Boolean = true
-}
-
-object NO_INTRINSIC : AbstractBinaryOperationIntrinsic() {
-    override fun exists(): Boolean = false
-
-    override fun apply(expression: KtBinaryExpression, left: JsExpression, right: JsExpression, context: TranslationContext): JsExpression =
-            throw UnsupportedOperationException("BinaryOperationIntrinsic#NO_INTRINSIC_#apply")
-}

js/js.translator/src/org/jetbrains/kotlin/js/translate/operation/BinaryOperationTranslator.java

@@ -101,7 +101,7 @@ public final class BinaryOperationTranslator extends AbstractTranslator {
     @NotNull
     private JsExpression translate() {
         BinaryOperationIntrinsic intrinsic = getIntrinsicForExpression();
-        if (intrinsic.exists()) {
+        if (intrinsic != null) {
             return applyIntrinsic(intrinsic);
         }
         if (operationToken == KtTokens.ELVIS) {
@@ -158,7 +158,7 @@ public final class BinaryOperationTranslator extends AbstractTranslator {
         return result;
     }
 
-    @NotNull
+    @Nullable
     private BinaryOperationIntrinsic getIntrinsicForExpression() {
         return context().intrinsics().getBinaryOperationIntrinsic(expression, context());
     }