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Kotlin Full Reflection Library
/*
* Copyright 2010-2015 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.
* 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 kotlin.reflect.jvm.internal.impl.load.java
import kotlin.reflect.jvm.internal.impl.builtins.KotlinBuiltIns
import kotlin.reflect.jvm.internal.impl.descriptors.*
import kotlin.reflect.jvm.internal.impl.load.java.BuiltinMethodsWithDifferentJvmName.sameAsRenamedInJvmBuiltin
import kotlin.reflect.jvm.internal.impl.load.java.BuiltinMethodsWithSpecialGenericSignature.sameAsBuiltinMethodWithErasedValueParameters
import kotlin.reflect.jvm.internal.impl.load.java.descriptors.JavaClassDescriptor
import kotlin.reflect.jvm.internal.impl.load.java.descriptors.JavaMethodDescriptor
import kotlin.reflect.jvm.internal.impl.load.kotlin.JvmType
import kotlin.reflect.jvm.internal.impl.load.kotlin.computeJvmDescriptor
import kotlin.reflect.jvm.internal.impl.load.kotlin.forceSingleValueParameterBoxing
import kotlin.reflect.jvm.internal.impl.load.kotlin.mapToJvmType
import kotlin.reflect.jvm.internal.impl.resolve.ExternalOverridabilityCondition
import kotlin.reflect.jvm.internal.impl.resolve.ExternalOverridabilityCondition.Result
import kotlin.reflect.jvm.internal.impl.resolve.descriptorUtil.fqNameSafe
import kotlin.reflect.jvm.internal.impl.types.typeUtil.makeNullable
/**
* This class contains Java-related overridability conditions that may force incompatibility
*/
class JavaIncompatibilityRulesOverridabilityCondition : ExternalOverridabilityCondition {
override fun isOverridable(
superDescriptor: CallableDescriptor,
subDescriptor: CallableDescriptor,
subClassDescriptor: ClassDescriptor?
): Result {
if (isIncompatibleInAccordanceWithBuiltInOverridabilityRules(superDescriptor, subDescriptor, subClassDescriptor)) {
return Result.INCOMPATIBLE
}
if (doesJavaOverrideHaveIncompatibleValueParameterKinds(superDescriptor, subDescriptor)) {
return Result.INCOMPATIBLE
}
return Result.UNKNOWN
}
// This overridability condition checks two things:
// 1. Method accidentally having the same signature as special builtin has does not supposed to be override for it in Java class
// 2. In such Java class (with special signature clash) special builtin is loaded as hidden function with special signature, and
// it should not override non-special method in further inheritance
// See java.nio.Buffer
private fun isIncompatibleInAccordanceWithBuiltInOverridabilityRules(
superDescriptor: CallableDescriptor,
subDescriptor: CallableDescriptor,
subClassDescriptor: ClassDescriptor?
): Boolean {
if (superDescriptor !is CallableMemberDescriptor || subDescriptor !is FunctionDescriptor ||
KotlinBuiltIns.isBuiltIn(subDescriptor)
) {
return false
}
if (!subDescriptor.name.sameAsBuiltinMethodWithErasedValueParameters && !subDescriptor.name.sameAsRenamedInJvmBuiltin) {
return false
}
val overriddenBuiltin = superDescriptor.getOverriddenSpecialBuiltin()
// Checking second condition: special hidden override is not supposed to be an override to non-special irrelevant Java declaration
val isOneOfDescriptorsHidden =
subDescriptor.isHiddenToOvercomeSignatureClash != (superDescriptor as? FunctionDescriptor)?.isHiddenToOvercomeSignatureClash
if (isOneOfDescriptorsHidden &&
(overriddenBuiltin == null || !subDescriptor.isHiddenToOvercomeSignatureClash)
) {
return true
}
// If new containing class is not Java class or subDescriptor signature was artificially changed, use basic overridability rules
if (subClassDescriptor !is JavaClassDescriptor || subDescriptor.initialSignatureDescriptor != null) {
return false
}
// If current Java class has Kotlin super class with override of overriddenBuiltin, then common overridability rules can be applied
// because of final special bridge generated in Kotlin super class
if (overriddenBuiltin == null || subClassDescriptor.hasRealKotlinSuperClassWithOverrideOf(overriddenBuiltin)) return false
// class A extends HashMap {
// void get(Object x) {}
// }
//
// The problem is that when checking overridability of `A.get` and `HashMap.get` we fall through to here, because
// we do not recreate a magic copy of it, because it has the same signature.
// But it obviously that if subDescriptor and superDescriptor has the same JVM descriptor, they're one-way overridable.
// Note that it doesn't work if special builtIn was renamed, because we do not consider renamed built-ins
// in `computeJvmDescriptor`.
// TODO: things get more and more complicated here, consider moving signature mapping from backend and using it here instead of all of this magic
if (overriddenBuiltin is FunctionDescriptor && superDescriptor is FunctionDescriptor &&
BuiltinMethodsWithSpecialGenericSignature.getOverriddenBuiltinFunctionWithErasedValueParametersInJava(overriddenBuiltin) != null &&
subDescriptor.computeJvmDescriptor(withReturnType = false) == superDescriptor.original.computeJvmDescriptor(withReturnType = false)
) {
return false
}
// Here we know that something in Java with common signature is going to override some special builtin that is supposed to be
// incompatible override
return true
}
override fun getContract() = ExternalOverridabilityCondition.Contract.CONFLICTS_ONLY
companion object {
/**
* Checks if any pair of corresponding value parameters has different type kinds, e.g. one is primitive and another is not
*
* As it comes from it's name it only checks overrides in Java classes
*/
fun doesJavaOverrideHaveIncompatibleValueParameterKinds(
superDescriptor: CallableDescriptor,
subDescriptor: CallableDescriptor
): Boolean {
if (subDescriptor !is JavaMethodDescriptor || superDescriptor !is FunctionDescriptor) return false
assert(subDescriptor.valueParameters.size == superDescriptor.valueParameters.size) {
"External overridability condition with CONFLICTS_ONLY should not be run with different value parameters size"
}
for ((subParameter, superParameter) in subDescriptor.original.valueParameters.zip(superDescriptor.original.valueParameters)) {
val isSubPrimitive = mapValueParameterType(subDescriptor, subParameter) is JvmType.Primitive
val isSuperPrimitive = mapValueParameterType(superDescriptor, superParameter) is JvmType.Primitive
if (isSubPrimitive != isSuperPrimitive) {
return true
}
}
return false
}
private fun mapValueParameterType(f: FunctionDescriptor, valueParameterDescriptor: ValueParameterDescriptor) =
if (forceSingleValueParameterBoxing(f) || isPrimitiveCompareTo(f))
valueParameterDescriptor.type.makeNullable().mapToJvmType()
else
valueParameterDescriptor.type.mapToJvmType()
// It's useful here to suppose that 'Int.compareTo(Int)' requires boxing of it's value parameter
// As it happens in java.lang.Integer analogue
// It only affects additional built-ins loading (see 'testLoadBuiltIns' tests)
private fun isPrimitiveCompareTo(f: FunctionDescriptor): Boolean {
if (f.valueParameters.size != 1) return false
val classDescriptor =
f.containingDeclaration as? ClassDescriptor ?: return false
val parameterClass =
f.valueParameters.single().type.constructor.declarationDescriptor as? ClassDescriptor
?: return false
return KotlinBuiltIns.isPrimitiveClass(classDescriptor) && classDescriptor.fqNameSafe == parameterClass.fqNameSafe
}
}
}