JVM_IR: More special bridge rewriting.

If there is an existing method that will have its argument types
remapped to boxed types, make sure to reflect that in the IR so
that code will be generated for a boxed value instead of a
primitive value.

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/BridgeLowering.kt

@@ -17,6 +17,7 @@ import org.jetbrains.kotlin.backend.jvm.JvmBackendContext
 import org.jetbrains.kotlin.backend.jvm.JvmLoweredDeclarationOrigin
 import org.jetbrains.kotlin.backend.jvm.ir.eraseTypeParameters
 import org.jetbrains.kotlin.backend.jvm.ir.hasJvmDefault
+import org.jetbrains.kotlin.codegen.AsmUtil
 import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.descriptors.ReceiverParameterDescriptor
 import org.jetbrains.kotlin.descriptors.Visibilities
@@ -32,11 +33,12 @@ import org.jetbrains.kotlin.ir.expressions.IrBlockBody
 import org.jetbrains.kotlin.ir.expressions.IrExpression
 import org.jetbrains.kotlin.ir.expressions.IrExpressionBody
 import org.jetbrains.kotlin.ir.expressions.IrStatementOrigin
-import org.jetbrains.kotlin.ir.expressions.impl.*
+import org.jetbrains.kotlin.ir.expressions.impl.IrCallImpl
 import org.jetbrains.kotlin.ir.symbols.impl.IrSimpleFunctionSymbolImpl
 import org.jetbrains.kotlin.ir.symbols.impl.IrValueParameterSymbolImpl
 import org.jetbrains.kotlin.ir.types.IrType
 import org.jetbrains.kotlin.ir.types.isNullable
+import org.jetbrains.kotlin.ir.types.makeNullable
 import org.jetbrains.kotlin.ir.util.defaultType
 import org.jetbrains.kotlin.ir.util.fqNameWhenAvailable
 import org.jetbrains.kotlin.ir.util.isInterface
@@ -44,6 +46,7 @@ import org.jetbrains.kotlin.ir.util.parentAsClass
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.util.OperatorNameConventions
 import org.jetbrains.kotlin.utils.addToStdlib.safeAs
+import org.jetbrains.org.objectweb.asm.Type
 import org.jetbrains.org.objectweb.asm.commons.Method
 
 internal val bridgePhase = makeIrFilePhase(
@@ -159,10 +162,9 @@ private class BridgeLowering(val context: JvmBackendContext) : ClassLoweringPass
             )
         }
 
-        // If there is an existing function that would conflict with a special bridge signature, insert the special bridge
+        // Deal with existing function that override special bridge methods.
-        // code directly as a prelude in the existing method.
+        if (!irFunction.isFakeOverride && specialOverride != null) {
-        if (!irFunction.isFakeOverride && specialOverride != null && specialOverrideSignature == ourSignature) {
+            irFunction.rewriteSpecialMethodBody(ourSignature, specialOverrideSignature!!, specialOverrideInfo!!)
-            irFunction.rewriteSpecialMethodBody(specialOverrideInfo!!)
         }
 
         val bridgeSignatures = generateBridges(
@@ -277,7 +279,15 @@ private class BridgeLowering(val context: JvmBackendContext) : ClassLoweringPass
         )
     }
 
-    private fun IrSimpleFunction.rewriteSpecialMethodBody(specialOverrideInfo: SpecialMethodWithDefaultInfo) {
+    private fun IrSimpleFunction.rewriteSpecialMethodBody(
+        ourSignature: Method,
+        specialOverrideSignature: Method,
+        specialOverrideInfo: SpecialMethodWithDefaultInfo
+    ) {
+        // If there is an existing function that would conflict with a special bridge signature, insert the special bridge
+        // code directly as a prelude in the existing method.
+        val variableMap = mutableMapOf<IrValueParameter, IrValueParameter>()
+        if (specialOverrideSignature == ourSignature) {
             val argumentsToCheck = valueParameters.take(specialOverrideInfo.argumentsToCheck)
             val shouldGenerateParameterChecks = argumentsToCheck.any { !it.type.isNullable() }
             if (shouldGenerateParameterChecks) {
@@ -287,7 +297,6 @@ private class BridgeLowering(val context: JvmBackendContext) : ClassLoweringPass
                     body = irBlockBody {
                         // Change the parameter types to be Any? so that null checks are not generated. The checks
                         // we insert here make them superfluous.
-                    val variableMap = mutableMapOf<IrValueParameter, IrValueParameter>()
                         argumentsToCheck.forEach {
                             val parameterType = it.type
                             if (!parameterType.isNullable()) {
@@ -302,10 +311,7 @@ private class BridgeLowering(val context: JvmBackendContext) : ClassLoweringPass
                                 )
                             }
                         }
-
+                        // After the checks, insert the orignal method body.
-                    // Map usages of rewritten parameters in old body to the new parameters and paste in the body after the explicit
-                    // null check.
-                    body?.transform(VariableRemapper(variableMap), null)
                         if (body is IrExpressionBody) {
                             +(body as IrExpressionBody).expression
                         } else {
@@ -314,6 +320,22 @@ private class BridgeLowering(val context: JvmBackendContext) : ClassLoweringPass
                     }
                 }
             }
+        } else {
+            // If the signature of this method will be changed in the output to take a boxed argument instead of a primitive,
+            // rewrite the argument so that code will be generated for a boxed argument and not a primitive.
+            for ((i, p) in valueParameters.withIndex()) {
+                if (AsmUtil.isPrimitive(context.typeMapper.mapType(p.type)) && ourSignature.argumentTypes[i].sort == Type.OBJECT) {
+                    val newParameter = p.copyTo(this, type = p.type.makeNullable())
+                    variableMap[p] = newParameter
+                    valueParameters[i] = newParameter
+                }
+            }
+        }
+        // If any parameters change, remap them in the function body.
+        if (variableMap.isNotEmpty()) {
+            body?.transform(VariableRemapper(variableMap), null)
+        }
+
     }
 
     private fun IrSimpleFunction.createBridgeBody(

compiler/testData/codegen/box/specialBuiltins/removeSetInt.kt

@@ -1,7 +1,6 @@
 // IGNORE_BACKEND_FIR: JVM_IR
 // KJS_WITH_FULL_RUNTIME
 // IGNORE_BACKEND: NATIVE
-// IGNORE_BACKEND: JVM_IR
 class MySet : HashSet<Int>() {
     override fun remove(element: Int): Boolean {
         return super.remove(element)