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/*
* 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.
* 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 org.jetbrains.kotlin.resolve.calls.smartcasts
import org.jetbrains.kotlin.builtins.KotlinBuiltIns
import org.jetbrains.kotlin.types.ErrorUtils
import org.jetbrains.kotlin.types.KotlinType
import org.jetbrains.kotlin.types.TypeUtils
private val KotlinType.immanentNullability: Nullability
get() = if (TypeUtils.isNullableType(this)) Nullability.UNKNOWN else Nullability.NOT_NULL
/**
* This class describes an arbitrary object which has some value in data flow analysis.
* In general case it's some r-value.
*/
class DataFlowValue(
val identifierInfo: IdentifierInfo,
val type: KotlinType,
val immanentNullability: Nullability = type.immanentNullability
) {
val kind: Kind get() = identifierInfo.kind
enum class Kind(private val str: String, val description: String = str) {
// Local value, or parameter, or private / internal member value without open / custom getter,
// or protected / public member value from the same module without open / custom getter
// Smart casts are completely safe
STABLE_VALUE("stable val"),
// Block, or if / else, or when
STABLE_COMPLEX_EXPRESSION("complex expression", ""),
// Should be unstable, but can be used as stable with deprecation warning
LEGACY_STABLE_LOCAL_DELEGATED_PROPERTY("local delegated property"),
// Member value with open / custom getter
// Smart casts are not safe
PROPERTY_WITH_GETTER("custom getter", "property that has open or custom getter"),
// Protected / public member value from another module
// Smart casts are not safe
ALIEN_PUBLIC_PROPERTY("alien public", "public API property declared in different module"),
// Local variable not yet captured by a changing closure
// Smart casts are safe but possible changes in loops / closures ahead must be taken into account
STABLE_VARIABLE("stable var", "local variable that can be changed since the check in a loop"),
// Local variable already captured by a changing closure
// Smart casts are not safe
CAPTURED_VARIABLE("captured var", "local variable that is captured by a changing closure"),
// Member variable regardless of its visibility
// Smart casts are not safe
MUTABLE_PROPERTY("member", "mutable property that could have been changed by this time"),
// Some complex expression
// Smart casts are not safe
OTHER("other", "complex expression");
override fun toString() = str
}
/**
* Stable means here we do not expect some sudden change of their values,
* like accessing mutable properties in another thread, so smart casts can be used safely.
*/
val isStable = kind == Kind.STABLE_VALUE ||
kind == Kind.STABLE_VARIABLE ||
kind == Kind.STABLE_COMPLEX_EXPRESSION ||
kind == Kind.LEGACY_STABLE_LOCAL_DELEGATED_PROPERTY
val canBeBound get() = identifierInfo.canBeBound
override fun equals(other: Any?): Boolean {
if (this === other) return true
if (other !is DataFlowValue) return false
if (identifierInfo != other.identifierInfo) return false
if (type != other.type) return false
return true
}
override fun toString() = "$kind $identifierInfo $immanentNullability"
private var hashCode = 0
override fun hashCode(): Int {
var hashCode = hashCode
if (hashCode == 0) {
hashCode = type.hashCode() + 31 * identifierInfo.hashCode()
this.hashCode = hashCode
}
return hashCode
}
companion object {
@JvmStatic
fun nullValue(builtIns: KotlinBuiltIns) = DataFlowValue(IdentifierInfo.NULL, builtIns.nullableNothingType, Nullability.NULL)
@JvmField
val ERROR = DataFlowValue(IdentifierInfo.ERROR, ErrorUtils.createErrorType("Error type for data flow"), Nullability.IMPOSSIBLE)
}
}
