Do not use dispatch receiver type when calculating method owner
Motivation of using dispatch receiver type when calculating method owner was discussed here: https://github.com/JetBrains/kotlin/pull/3054 However, this is incompatible with type erasure of non-reified type parameters on inlining (which will be done in future). Consider the code: ``` inline fun <T> f(arr: Array<T>, p: (T) -> Int): Int = p(arr[0]) fun box() = f(arrayOf("abacaba"), String::length) ``` After inlining and erasure, the type of `arr[0]` is `Any`. Thus, when calculating owner of `String::length` we would have `Any` instead of `String` if we used dispatch receiver type. Note, that this change affects bytecode instruction that invokes method, but does not change which method is being invoked.
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Space Team
parent
ca80ddb8ca
commit
44caa3cdd5
+1
-6
@@ -398,12 +398,7 @@ class MethodSignatureMapper(private val context: JvmBackendContext, private val
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// TODO get rid of 'caller' argument
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fun mapToCallableMethod(expression: IrCall, caller: IrFunction?): IrCallableMethod {
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val callee = expression.symbol.owner
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val calleeParent = expression.superQualifierSymbol?.owner
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?: expression.dispatchReceiver?.type?.classOrNull?.owner?.let {
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// Calling Object class methods on interfaces is permitted, but they're not interface methods.
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if (it.isJvmInterface && callee.isMethodOfAny()) context.irBuiltIns.anyClass.owner else it
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}
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?: callee.parentAsClass // Static call or type parameter
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val calleeParent = expression.superQualifierSymbol?.owner ?: callee.parentAsClass
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val owner = typeMapper.mapOwner(calleeParent)
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val isInterface = calleeParent.isJvmInterface
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+4
-2
@@ -20,8 +20,10 @@ fun box(): String {
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// CHECK_BYTECODE_TEXT
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// JVM_IR_TEMPLATES
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// 0 java/util/Iterator.hasNext \(\)Z
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// 1 java/util/Iterator.hasNext \(\)Z
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// 0 java/util/Iterator.next \(\)Ljava/lang/Object;
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// 1 MyUIntIterator.hasNext \(\)Z
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// 0 MyUIntIterator.next \(\)Ljava/lang/Object;
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// 0 MyUIntIterator.hasNext \(\)Z
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// 1 public synthetic bridge next\(\)Ljava/lang/Object;
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// 2 MyUIntIterator.next-pVg5ArA \(\)I
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// 0 INVOKEVIRTUAL kotlin/UInt.unbox-impl \(\)I
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+1
-1
@@ -10,7 +10,7 @@
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// JVM_IR_TEMPLATES
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// 12 java/lang/invoke/LambdaMetafactory
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// 1 (LOOKUP|TABLE)SWITCH
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// 24 java/lang/String\.equals
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// 4 java/lang/String\.equals
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// FILE: multipleTopLevelFunRefs.kt
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import java.io.*
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