[FIR] Extract jvm-only call conflict resolver

compiler/fir/jvm/src/org/jetbrains/kotlin/fir/resolve/calls/jvm/ConeEquivalentCallConflictResolver.kt

@@ -0,0 +1,74 @@
+/*
+ * Copyright 2010-2019 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.fir.resolve.calls.jvm
+
+import org.jetbrains.kotlin.fir.declarations.*
+import org.jetbrains.kotlin.fir.resolve.calls.Candidate
+import org.jetbrains.kotlin.fir.resolve.calls.AbstractConeCallConflictResolver
+import org.jetbrains.kotlin.fir.resolve.calls.InferenceComponents
+import org.jetbrains.kotlin.fir.types.ConeKotlinType
+import org.jetbrains.kotlin.fir.types.coneTypeUnsafe
+import org.jetbrains.kotlin.resolve.calls.results.FlatSignature
+import org.jetbrains.kotlin.resolve.calls.results.TypeSpecificityComparator
+
+// This conflict resolver filters JVM equivalent top-level functions
+// like emptyArray() from intrinsics and built-ins
+class ConeEquivalentCallConflictResolver(
+    specificityComparator: TypeSpecificityComparator,
+    inferenceComponents: InferenceComponents
+) : AbstractConeCallConflictResolver(specificityComparator, inferenceComponents) {
+    override fun chooseMaximallySpecificCandidates(
+        candidates: Set<Candidate>,
+        discriminateGenerics: Boolean
+    ): Set<Candidate> {
+        return filterOutEquivalentCalls(candidates)
+    }
+
+    private fun filterOutEquivalentCalls(candidates: Collection<Candidate>): Set<Candidate> {
+        val result = mutableSetOf<Candidate>()
+        outerLoop@ for (myCandidate in candidates) {
+            val me = myCandidate.symbol.fir
+            if (me is FirCallableMemberDeclaration<*> && me.symbol.callableId.className == null) {
+                for (otherCandidate in result) {
+                    val other = otherCandidate.symbol.fir
+                    if (other is FirCallableMemberDeclaration<*> && other.symbol.callableId.className == null) {
+                        if (areEquivalentTopLevelCallables(me, myCandidate, other, otherCandidate)) {
+                            continue@outerLoop
+                        }
+                    }
+                }
+            }
+            result += myCandidate
+        }
+        return result
+    }
+
+    private fun areEquivalentTopLevelCallables(
+        first: FirCallableMemberDeclaration<*>,
+        firstCandidate: Candidate,
+        second: FirCallableMemberDeclaration<*>,
+        secondCandidate: Candidate
+    ): Boolean {
+        if (first.symbol.callableId != second.symbol.callableId) return false
+        if (first.isExpect != second.isExpect) return false
+        if (first.receiverTypeRef?.coneTypeUnsafe<ConeKotlinType>() != second.receiverTypeRef?.coneTypeUnsafe()) {
+            return false
+        }
+        val firstSignature = createFlatSignature(firstCandidate, first)
+        val secondSignature = createFlatSignature(secondCandidate, second)
+        return compareCallsByUsedArguments(firstSignature, secondSignature, false) &&
+                compareCallsByUsedArguments(secondSignature, firstSignature, false)
+    }
+
+    private fun createFlatSignature(call: Candidate, declaration: FirCallableMemberDeclaration<*>): FlatSignature<Candidate> {
+        return when (declaration) {
+            is FirSimpleFunction -> createFlatSignature(call, declaration)
+            is FirConstructor -> createFlatSignature(call, declaration)
+            is FirVariable<*> -> createFlatSignature(call, declaration as FirVariable<*>)
+            else -> error("Not supported: $declaration")
+        }
+    }
+}

compiler/fir/jvm/src/org/jetbrains/kotlin/fir/resolve/calls/jvm/JvmCallConflictResolverFactory.kt

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2010-2019 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.fir.resolve.calls.jvm
+
+import org.jetbrains.kotlin.fir.resolve.calls.ConeCallConflictResolverFactory
+import org.jetbrains.kotlin.fir.resolve.calls.ConeCompositeConflictResolver
+import org.jetbrains.kotlin.fir.resolve.calls.ConeOverloadConflictResolver
+import org.jetbrains.kotlin.fir.resolve.calls.InferenceComponents
+import org.jetbrains.kotlin.resolve.calls.results.TypeSpecificityComparator
+
+object JvmCallConflictResolverFactory : ConeCallConflictResolverFactory() {
+    override fun create(
+        typeSpecificityComparator: TypeSpecificityComparator,
+        components: InferenceComponents
+    ) = ConeCompositeConflictResolver(
+        ConeOverloadConflictResolver(TypeSpecificityComparator.NONE, components),
+        ConeEquivalentCallConflictResolver(TypeSpecificityComparator.NONE, components)
+    )
+
+}