[K/N] implement toString for ObjC spec classes

Make compiler debugging easier by giving objects meaningful names

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/objcexport/ObjCExportCodeSpec.kt

@@ -14,7 +14,6 @@ import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.ir.symbols.*
 import org.jetbrains.kotlin.ir.util.SymbolTable
 import org.jetbrains.kotlin.resolve.descriptorUtil.getSuperClassNotAny
-import org.jetbrains.kotlin.resolve.descriptorUtil.hasCompanionObject
 
 internal fun ObjCExportedInterface.createCodeSpec(symbolTable: SymbolTable): ObjCExportCodeSpec {
 
@@ -43,7 +42,7 @@ internal fun ObjCExportedInterface.createCodeSpec(symbolTable: SymbolTable): Obj
     val files = topLevel.map { (sourceFile, declarations) ->
         val binaryName = namer.getFileClassName(sourceFile).binaryName
         val methods = declarations.toObjCMethods()
-        ObjCClassForKotlinFile(binaryName, methods)
+        ObjCClassForKotlinFile(binaryName, sourceFile, methods)
     }
 
     val classToType = mutableMapOf<ClassDescriptor, ObjCTypeForKotlinType>()
@@ -141,27 +140,48 @@ internal sealed class ObjCMethodSpec {
     data class BaseMethod<out S : IrFunctionSymbol>(val symbol: S, val bridge: MethodBridge, val selector: String)
 }
 
-internal class ObjCMethodForKotlinMethod(val baseMethod: BaseMethod<IrSimpleFunctionSymbol>) : ObjCMethodSpec()
+internal class ObjCMethodForKotlinMethod(val baseMethod: BaseMethod<IrSimpleFunctionSymbol>) : ObjCMethodSpec() {
+    override fun toString(): String =
+            "ObjC spec of method `${baseMethod.selector}` for `${baseMethod.symbol}`"
+}
 
-internal class ObjCInitMethodForKotlinConstructor(val baseMethod: BaseMethod<IrConstructorSymbol>) : ObjCMethodSpec()
+internal class ObjCInitMethodForKotlinConstructor(val baseMethod: BaseMethod<IrConstructorSymbol>) : ObjCMethodSpec() {
+    override fun toString(): String =
+            "ObjC spec of method `${baseMethod.selector}` for `${baseMethod.symbol}`"
+}
 
 internal class ObjCFactoryMethodForKotlinArrayConstructor(
         val baseMethod: BaseMethod<IrConstructorSymbol>
-) : ObjCMethodSpec()
+) : ObjCMethodSpec() {
+    override fun toString(): String =
+            "ObjC spec of factory ${baseMethod.selector} for ${baseMethod.symbol}"
+}
 
 internal class ObjCGetterForKotlinEnumEntry(
         val irEnumEntrySymbol: IrEnumEntrySymbol,
         val selector: String
-) : ObjCMethodSpec()
+) : ObjCMethodSpec() {
+    override fun toString(): String =
+            "ObjC spec of getter `$selector` for `$irEnumEntrySymbol`"
+}
 
 internal class ObjCClassMethodForKotlinEnumValues(
         val valuesFunctionSymbol: IrFunctionSymbol,
         val selector: String
-) : ObjCMethodSpec()
+) : ObjCMethodSpec() {
+    override fun toString(): String =
+            "ObjC spec of method `$selector` for $valuesFunctionSymbol"
+}
 
-internal class ObjCGetterForObjectInstance(val selector: String, val classSymbol: IrClassSymbol) : ObjCMethodSpec()
+internal class ObjCGetterForObjectInstance(val selector: String, val classSymbol: IrClassSymbol) : ObjCMethodSpec() {
+    override fun toString(): String =
+            "ObjC spec of instance getter `$selector` for $classSymbol"
+}
 
-internal object ObjCKotlinThrowableAsErrorMethod : ObjCMethodSpec()
+internal object ObjCKotlinThrowableAsErrorMethod : ObjCMethodSpec() {
+    override fun toString(): String =
+            "ObjC spec for ThrowableAsError method"
+}
 
 internal sealed class ObjCTypeSpec(val binaryName: String)
 
@@ -177,15 +197,26 @@ internal class ObjCClassForKotlinClass(
         methods: List<ObjCMethodSpec>,
         val categoryMethods: List<ObjCMethodForKotlinMethod>,
         val superClassNotAny: ObjCClassForKotlinClass?
-) : ObjCTypeForKotlinType(binaryName, irClassSymbol, methods)
+) : ObjCTypeForKotlinType(binaryName, irClassSymbol, methods) {
+    override fun toString(): String =
+            "ObjC spec of class `$binaryName` for `$irClassSymbol`"
+}
 
 internal class ObjCProtocolForKotlinInterface(
         binaryName: String,
         irClassSymbol: IrClassSymbol,
         methods: List<ObjCMethodSpec>
-) : ObjCTypeForKotlinType(binaryName, irClassSymbol, methods)
+) : ObjCTypeForKotlinType(binaryName, irClassSymbol, methods) {
+
+    override fun toString(): String =
+            "ObjC spec of protocol `$binaryName` for `$irClassSymbol`"
+}
 
 internal class ObjCClassForKotlinFile(
         binaryName: String,
+        private val sourceFile: SourceFile,
         val methods: List<ObjCMethodForKotlinMethod>
-) : ObjCTypeSpec(binaryName)
+) : ObjCTypeSpec(binaryName) {
+    override fun toString(): String =
+            "ObjC spec of class `$binaryName` for `${sourceFile.name}`"
+}