[FIR2IR] Implement JvmBackendClassResolver for boxing optimizer

compiler/fir/fir2ir/jvm-backend/build.gradle.kts

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2000-2018 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.
+ */
+
+plugins {
+    kotlin("jvm")
+    id("jps-compatible")
+}
+
+dependencies {
+    compileOnly(project(":core:descriptors"))
+    compileOnly(project(":compiler:fir:cones"))
+    compileOnly(project(":compiler:fir:resolve"))
+    compileOnly(project(":compiler:fir:tree"))
+    compileOnly(project(":compiler:fir:fir2ir"))
+    compileOnly(project(":compiler:ir.tree"))
+    compileOnly(project(":compiler:ir.psi2ir"))
+    compileOnly(project(":compiler:ir.backend.common"))
+    compileOnly(project(":compiler:backend"))
+
+    compileOnly(intellijCoreDep()) { includeJars("intellij-core", "asm-all", rootProject = rootProject) }
+
+}
+
+sourceSets {
+    "main" { projectDefault() }
+}

compiler/fir/fir2ir/jvm-backend/src/org/jetbrains/kotlin/fir/backend/jvm/FirJvmBackendClassResolver.kt

@@ -0,0 +1,25 @@
+/*
+ * 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.
+ */
+
+package org.jetbrains.kotlin.fir.backend.jvm
+
+import org.jetbrains.kotlin.codegen.JvmBackendClassResolver
+import org.jetbrains.kotlin.codegen.classId
+import org.jetbrains.kotlin.descriptors.ClassDescriptor
+import org.jetbrains.kotlin.fir.backend.Fir2IrComponents
+import org.jetbrains.kotlin.fir.resolve.firSymbolProvider
+import org.jetbrains.kotlin.fir.symbols.impl.FirClassSymbol
+import org.jetbrains.org.objectweb.asm.Type
+
+class FirJvmBackendClassResolver(val components: Fir2IrComponents) : JvmBackendClassResolver {
+    override fun resolveToClassDescriptors(type: Type): List<ClassDescriptor> {
+        if (type.sort != Type.OBJECT) return emptyList()
+
+        val symbol = components.session.firSymbolProvider.getClassLikeSymbolByFqName(type.classId) ?: return emptyList()
+        require(symbol is FirClassSymbol<*>)
+        return listOf(components.classifierStorage.getIrClassSymbol(symbol).descriptor)
+    }
+
+}

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrConverter.kt

@@ -204,7 +204,7 @@ class Fir2IrConverter(
             }
 
             externalDependenciesGenerator.generateUnboundSymbolsAsDependencies()
-            return Fir2IrResult(irModuleFragment, symbolTable, sourceManager)
+            return Fir2IrResult(irModuleFragment, symbolTable, sourceManager, components)
         }
     }
 }

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrResult.kt

@@ -9,4 +9,4 @@ import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
 import org.jetbrains.kotlin.ir.util.SymbolTable
 import org.jetbrains.kotlin.psi2ir.PsiSourceManager
 
-data class Fir2IrResult(val irModuleFragment: IrModuleFragment, val symbolTable: SymbolTable, val sourceManager: PsiSourceManager)
+data class Fir2IrResult(val irModuleFragment: IrModuleFragment, val symbolTable: SymbolTable, val sourceManager: PsiSourceManager, val components: Fir2IrComponents)