Remove obsolete code about warnings for expressions which can be null in java(has @Nullable annotation in java) and in kotlin not marked nullable.

After introducing flexible types and signature enhancement there is no more such expressions.

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/checkers/JavaNullabilityWarningsChecker.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2015 JetBrains s.r.o.
+ * 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.
@@ -18,182 +18,41 @@ package org.jetbrains.kotlin.resolve.jvm.checkers
 
 import org.jetbrains.kotlin.cfg.WhenChecker
 import org.jetbrains.kotlin.descriptors.ReceiverParameterDescriptor
-import org.jetbrains.kotlin.diagnostics.Errors
-import org.jetbrains.kotlin.lexer.KtTokens
 import org.jetbrains.kotlin.load.java.lazy.types.isMarkedNotNull
-import org.jetbrains.kotlin.load.java.lazy.types.isMarkedNullable
-import org.jetbrains.kotlin.psi.KtBinaryExpression
 import org.jetbrains.kotlin.psi.KtExpression
-import org.jetbrains.kotlin.psi.KtPostfixExpression
 import org.jetbrains.kotlin.psi.KtWhenExpression
 import org.jetbrains.kotlin.resolve.calls.checkers.AdditionalTypeChecker
 import org.jetbrains.kotlin.resolve.calls.context.CallResolutionContext
 import org.jetbrains.kotlin.resolve.calls.context.ResolutionContext
-import org.jetbrains.kotlin.resolve.calls.smartcasts.DataFlowInfo
-import org.jetbrains.kotlin.resolve.calls.smartcasts.DataFlowValue
-import org.jetbrains.kotlin.resolve.calls.smartcasts.DataFlowValueFactory
-import org.jetbrains.kotlin.resolve.calls.smartcasts.Nullability
 import org.jetbrains.kotlin.resolve.jvm.diagnostics.ErrorsJvm
-import org.jetbrains.kotlin.resolve.scopes.receivers.ExpressionReceiver
 import org.jetbrains.kotlin.resolve.scopes.receivers.ReceiverValue
 import org.jetbrains.kotlin.types.KotlinType
 import org.jetbrains.kotlin.types.TypeUtils
-import org.jetbrains.kotlin.types.expressions.SenselessComparisonChecker
 import org.jetbrains.kotlin.types.flexibility
 import org.jetbrains.kotlin.types.isFlexible
 
 class JavaNullabilityWarningsChecker : AdditionalTypeChecker {
-    private fun KotlinType.mayBeNull(): ErrorsJvm.NullabilityInformationSource? {
-        if (!isError && !isFlexible() && TypeUtils.isNullableType(this)) return ErrorsJvm.NullabilityInformationSource.KOTLIN
-
-        if (isFlexible() && TypeUtils.isNullableType(flexibility().lowerBound)) return ErrorsJvm.NullabilityInformationSource.KOTLIN
-
-        if (annotations.isMarkedNullable()) return ErrorsJvm.NullabilityInformationSource.JAVA
-        return null
-    }
-
-    private fun KotlinType.mustNotBeNull(): ErrorsJvm.NullabilityInformationSource? {
-        if (!isError && !isFlexible() && !TypeUtils.isNullableType(this)) return ErrorsJvm.NullabilityInformationSource.KOTLIN
-
-        if (isFlexible() && !TypeUtils.isNullableType(flexibility().upperBound)) return ErrorsJvm.NullabilityInformationSource.KOTLIN
-
-        if (!isMarkedNullable && annotations.isMarkedNotNull()) return ErrorsJvm.NullabilityInformationSource.JAVA
-        return null
-    }
-
-    private fun doCheckType(
-            expressionType: KotlinType,
-            expectedType: KotlinType,
-            dataFlowValue: DataFlowValue,
-            dataFlowInfo: DataFlowInfo,
-            reportWarning: (expectedMustNotBeNull: ErrorsJvm.NullabilityInformationSource, actualMayBeNull: ErrorsJvm.NullabilityInformationSource) -> Unit
-    ) {
-        if (TypeUtils.noExpectedType(expectedType)) return
-
-        val expectedMustNotBeNull = expectedType.mustNotBeNull()
-        if (dataFlowInfo.getPredictableNullability(dataFlowValue) == Nullability.NOT_NULL) return
-
-        val actualMayBeNull = expressionType.mayBeNull()
-
-        if (expectedMustNotBeNull == ErrorsJvm.NullabilityInformationSource.KOTLIN && actualMayBeNull == ErrorsJvm.NullabilityInformationSource.KOTLIN) {
-            // a type mismatch error will be reported elsewhere
-            return;
-        }
-
-        if (expectedMustNotBeNull != null && actualMayBeNull != null) {
-            reportWarning(expectedMustNotBeNull, actualMayBeNull)
-        }
-    }
 
     override fun checkType(expression: KtExpression, expressionType: KotlinType, expressionTypeWithSmartCast: KotlinType, c: ResolutionContext<*>) {
-        doCheckType(
+        if (expression is KtWhenExpression && expression.elseExpression == null) {
-                expressionType,
+            // Check for conditionally-exhaustive when on platform enums, see KT-6399
-                c.expectedType,
+            val type = expression.subjectExpression?.let { c.trace.getType(it) } ?: return
-                DataFlowValueFactory.createDataFlowValue(expression, expressionType, c),
+            if (type.isFlexible() && TypeUtils.isNullableType(type.flexibility().upperBound) && !type.annotations.isMarkedNotNull()) {
-                c.dataFlowInfo
+                val enumClassDescriptor = WhenChecker.getClassDescriptorOfTypeIfEnum(type) ?: return
-        ) {
+                val context = c.trace.bindingContext
-            expectedMustNotBeNull,
+                if (WhenChecker.getEnumMissingCases(expression, context, enumClassDescriptor).isEmpty()
-            actualMayBeNull ->
+                    && !WhenChecker.containsNullCase(expression, context)) {
-            c.trace.report(ErrorsJvm.NULLABILITY_MISMATCH_BASED_ON_JAVA_ANNOTATIONS.on(expression, expectedMustNotBeNull, actualMayBeNull))
-        }
 
-        when (expression) {
+                    c.trace.report(ErrorsJvm.WHEN_ENUM_CAN_BE_NULL_IN_JAVA.on(expression.subjectExpression!!))
-            is KtWhenExpression ->
-                    if (expression.elseExpression == null) {
-                        // Check for conditionally-exhaustive when on platform enums, see KT-6399
-                        val type = expression.subjectExpression?.let { c.trace.getType(it) } ?: return
-                        if (type.isFlexible() && TypeUtils.isNullableType(type.flexibility().upperBound) && !type.annotations.isMarkedNotNull()) {
-                            val enumClassDescriptor = WhenChecker.getClassDescriptorOfTypeIfEnum(type) ?: return
-                            val context = c.trace.bindingContext
-                            if (WhenChecker.getEnumMissingCases(expression, context, enumClassDescriptor).isEmpty()
-                                && !WhenChecker.containsNullCase(expression, context)) {
-
-                                c.trace.report(ErrorsJvm.WHEN_ENUM_CAN_BE_NULL_IN_JAVA.on(expression.subjectExpression!!))
-                            }
-                        }
-                    }
-            is KtPostfixExpression ->
-                    if (expression.operationToken == KtTokens.EXCLEXCL) {
-                        val baseExpression = expression.baseExpression ?: return
-                        val baseExpressionType = c.trace.getType(baseExpression) ?: return
-                        doIfNotNull(
-                                DataFlowValueFactory.createDataFlowValue(baseExpression, baseExpressionType, c),
-                                c
-                        ) {
-                            c.trace.report(Errors.UNNECESSARY_NOT_NULL_ASSERTION.on(expression.getOperationReference(), baseExpressionType))
-                        }
-                    }
-            is KtBinaryExpression ->
-                when (expression.operationToken) {
-                    KtTokens.ELVIS -> {
-                        val baseExpression = expression.left
-                        val baseExpressionType = baseExpression?.let{ c.trace.getType(it) } ?: return
-                        doIfNotNull(
-                                DataFlowValueFactory.createDataFlowValue(baseExpression!!, baseExpressionType, c),
-                                c
-                        ) {
-                            c.trace.report(Errors.USELESS_ELVIS.on(expression, baseExpressionType))
-                        }
-                    }
-                    KtTokens.EQEQ,
-                    KtTokens.EXCLEQ,
-                    KtTokens.EQEQEQ,
-                    KtTokens.EXCLEQEQEQ -> {
-                        if (expression.left != null && expression.right != null) {
-                            SenselessComparisonChecker.checkSenselessComparisonWithNull(
-                                    expression, expression.left!!, expression.right!!, c,
-                                    { c.trace.getType(it) },
-                                    {
-                                        value ->
-                                        doIfNotNull(value, c) { Nullability.NOT_NULL } ?: Nullability.UNKNOWN
-                                    }
-                            )
-                        }
-                    }
                 }
+            }
         }
     }
 
-    private fun <T: Any> doIfNotNull(dataFlowValue: DataFlowValue, c: ResolutionContext<*>, body: () -> T): T? {
-        if (c.dataFlowInfo.getPredictableNullability(dataFlowValue).canBeNull()
-            && dataFlowValue.type.mustNotBeNull() == ErrorsJvm.NullabilityInformationSource.JAVA) {
-            return body()
-        }
-        return null
-    }
-
     override fun checkReceiver(
             receiverParameter: ReceiverParameterDescriptor,
             receiverArgument: ReceiverValue,
             safeAccess: Boolean,
             c: CallResolutionContext<*>
-    ) {
+    ) {}
-        val dataFlowValue = DataFlowValueFactory.createDataFlowValue(receiverArgument, c)
-        if (!safeAccess) {
-            doCheckType(
-                    receiverArgument.type,
-                    receiverParameter.type,
-                    dataFlowValue,
-                    c.dataFlowInfo
-            ) {
-                expectedMustNotBeNull,
-                actualMayBeNull ->
-                val reportOn =
-                        if (receiverArgument is ExpressionReceiver)
-                            receiverArgument.expression
-                        else
-                            c.call.getCalleeExpression() ?: c.call.getCallElement()
-
-                c.trace.report(ErrorsJvm.NULLABILITY_MISMATCH_BASED_ON_JAVA_ANNOTATIONS.on(
-                        reportOn, expectedMustNotBeNull, actualMayBeNull
-                ))
-
-            }
-        }
-        else {
-            doIfNotNull(dataFlowValue, c) {
-                c.trace.report(Errors.UNNECESSARY_SAFE_CALL.on(c.call.getCallOperationNode()!!.getPsi(), receiverArgument.getType()))
-            }
-        }
-    }
 }

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/diagnostics/DefaultErrorMessagesJvm.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2015 JetBrains s.r.o.
+ * 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.
@@ -79,9 +79,6 @@ public class DefaultErrorMessagesJvm implements DefaultErrorMessages.Extension {
         MAP.put(ErrorsJvm.NO_REFLECTION_IN_CLASS_PATH, "Call uses reflection API which is not found in compilation classpath. " +
                                                        "Make sure you have kotlin-reflect.jar in the classpath");
 
-        MAP.put(ErrorsJvm.NULLABILITY_MISMATCH_BASED_ON_JAVA_ANNOTATIONS,
-                "Expected type does not accept nulls in {0}, but the value may be null in {1}", Renderers.TO_STRING, Renderers.TO_STRING);
-
         MAP.put(ErrorsJvm.INTERFACE_CANT_CALL_DEFAULT_METHOD_VIA_SUPER, "Interfaces can't call Java default methods via super");
         MAP.put(ErrorsJvm.SUBCLASS_CANT_CALL_COMPANION_PROTECTED_NON_STATIC, "Using non-JVM static members protected in the superclass companion is unsupported yet");
 

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/diagnostics/ErrorsJvm.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2015 JetBrains s.r.o.
+ * 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.
@@ -17,7 +17,6 @@
 package org.jetbrains.kotlin.resolve.jvm.diagnostics;
 
 import com.intellij.psi.PsiElement;
-import org.jetbrains.annotations.NotNull;
 import org.jetbrains.kotlin.diagnostics.DiagnosticFactory0;
 import org.jetbrains.kotlin.diagnostics.DiagnosticFactory1;
 import org.jetbrains.kotlin.diagnostics.DiagnosticFactory2;
@@ -85,25 +84,6 @@ public interface ErrorsJvm {
 
     DiagnosticFactory1<PsiElement, String> SUPER_CALL_WITH_DEFAULT_PARAMETERS = DiagnosticFactory1.create(ERROR);
 
-    enum NullabilityInformationSource {
-        KOTLIN {
-            @NotNull
-            @Override
-            public String toString() {
-                return "Kotlin";
-            }
-        },
-        JAVA {
-            @NotNull
-            @Override
-            public String toString() {
-                return "Java";
-            }
-        }
-    }
-
-    DiagnosticFactory2<KtElement, NullabilityInformationSource, NullabilityInformationSource> NULLABILITY_MISMATCH_BASED_ON_JAVA_ANNOTATIONS = DiagnosticFactory2.create(WARNING);
-
     DiagnosticFactory0<KtExpression> WHEN_ENUM_CAN_BE_NULL_IN_JAVA = DiagnosticFactory0.create(WARNING);
 
     @SuppressWarnings("UnusedDeclaration")