PSI2IR: Don't generate IMPLICIT_INTEGER_COERCION

Generate integer coercion function calls and properly typed constant
expressions instead.

compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/transformations/InsertImplicitCasts.kt

@@ -21,6 +21,7 @@ import org.jetbrains.kotlin.builtins.isFunctionType
 import org.jetbrains.kotlin.builtins.isSuspendFunctionType
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.descriptors.impl.AnonymousFunctionDescriptor
+import org.jetbrains.kotlin.incremental.components.NoLookupLocation
 import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.IrStatement
 import org.jetbrains.kotlin.ir.declarations.IrClass
@@ -29,20 +30,26 @@ import org.jetbrains.kotlin.ir.declarations.IrFunction
 import org.jetbrains.kotlin.ir.declarations.IrVariable
 import org.jetbrains.kotlin.ir.descriptors.IrBuiltIns
 import org.jetbrains.kotlin.ir.expressions.*
+import org.jetbrains.kotlin.ir.expressions.impl.IrCallImpl
+import org.jetbrains.kotlin.ir.expressions.impl.IrConstImpl
 import org.jetbrains.kotlin.ir.expressions.impl.IrTypeOperatorCallImpl
 import org.jetbrains.kotlin.ir.symbols.IrConstructorSymbol
 import org.jetbrains.kotlin.ir.types.IrType
 import org.jetbrains.kotlin.ir.types.impl.originalKotlinType
+import org.jetbrains.kotlin.ir.util.SymbolTable
 import org.jetbrains.kotlin.ir.util.TypeTranslator
 import org.jetbrains.kotlin.ir.util.coerceToUnit
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
 import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
 import org.jetbrains.kotlin.ir.visitors.transformChildrenVoid
+import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.psi2ir.containsNull
+import org.jetbrains.kotlin.psi2ir.findSingleFunction
 import org.jetbrains.kotlin.psi2ir.generators.GeneratorContext
 import org.jetbrains.kotlin.psi2ir.generators.GeneratorExtensions
 import org.jetbrains.kotlin.psi2ir.generators.getSubstitutedFunctionTypeForSamType
+import org.jetbrains.kotlin.resolve.descriptorUtil.module
 import org.jetbrains.kotlin.types.*
 import org.jetbrains.kotlin.types.checker.KotlinTypeChecker
 import org.jetbrains.kotlin.types.typeUtil.*
@@ -53,7 +60,8 @@ fun insertImplicitCasts(element: IrElement, context: GeneratorContext) {
         context.irBuiltIns,
         context.typeTranslator,
         context.callToSubstitutedDescriptorMap,
-        context.extensions
+        context.extensions,
+        context.symbolTable
     ).run(element)
 }
 
@@ -62,7 +70,8 @@ internal class InsertImplicitCasts(
     private val irBuiltIns: IrBuiltIns,
     private val typeTranslator: TypeTranslator,
     private val callToSubstitutedDescriptorMap: Map<IrDeclarationReference, CallableDescriptor>,
-    private val generatorExtensions: GeneratorExtensions
+    private val generatorExtensions: GeneratorExtensions,
+    private val symbolTable: SymbolTable
 ) : IrElementTransformerVoid() {
 
     private val expectedFunctionExpressionReturnType = hashMapOf<FunctionDescriptor, IrType>()
@@ -354,7 +363,7 @@ internal class InsertImplicitCasts(
                 this
 
             KotlinBuiltIns.isInt(valueType) && notNullableExpectedType.isBuiltInIntegerType() ->
-                implicitCast(notNullableExpectedType, IrTypeOperator.IMPLICIT_INTEGER_COERCION)
+                coerceIntToAnotherIntegerType(notNullableExpectedType)
 
             else -> {
                 val targetType = if (!valueType.containsNull()) notNullableExpectedType else expectedType
@@ -389,19 +398,73 @@ internal class InsertImplicitCasts(
         return implicitCast(nonNullValueType, IrTypeOperator.IMPLICIT_NOTNULL).cast(expectedType)
     }
 
-    private fun IrExpression.implicitCast(
-        targetType: KotlinType,
-        typeOperator: IrTypeOperator
-    ): IrExpression {
+    private fun IrExpression.implicitCast(targetType: KotlinType, typeOperator: IrTypeOperator): IrExpression {
         val irType = targetType.toIrType()
-        return IrTypeOperatorCallImpl(
-            startOffset,
-            endOffset,
-            irType,
-            typeOperator,
-            irType,
-            this
-        )
+        return IrTypeOperatorCallImpl(startOffset, endOffset, irType, typeOperator, irType, this)
+    }
+
+    private fun IrExpression.coerceIntToAnotherIntegerType(targetType: KotlinType): IrExpression {
+        if (!type.originalKotlinType!!.isInt()) throw AssertionError("Expression of type 'kotlin.Int' expected: $this")
+        if (targetType.isInt()) return this
+        return if (this is IrConst<*>) {
+            val value = this.value as Int
+            val irType = targetType.toIrType()
+            when {
+                targetType.isByte() -> IrConstImpl.byte(startOffset, endOffset, irType, value.toByte())
+                targetType.isShort() -> IrConstImpl.short(startOffset, endOffset, irType, value.toShort())
+                targetType.isLong() -> IrConstImpl.long(startOffset, endOffset, irType, value.toLong())
+                KotlinBuiltIns.isUByte(targetType) -> IrConstImpl.byte(startOffset, endOffset, irType, value.toByte())
+                KotlinBuiltIns.isUShort(targetType) -> IrConstImpl.short(startOffset, endOffset, irType, value.toShort())
+                KotlinBuiltIns.isUInt(targetType) -> IrConstImpl.int(startOffset, endOffset, irType, value)
+                KotlinBuiltIns.isULong(targetType) -> IrConstImpl.long(startOffset, endOffset, irType, value.toLong())
+                else -> throw AssertionError("Unexpected target type for integer coercion: $targetType")
+            }
+        } else {
+            when {
+                targetType.isByte() -> invokeIntegerCoercionFunction(targetType, "toByte")
+                targetType.isShort() -> invokeIntegerCoercionFunction(targetType, "toShort")
+                targetType.isLong() -> invokeIntegerCoercionFunction(targetType, "toLong")
+                KotlinBuiltIns.isUByte(targetType) -> invokeUnsignedIntegerCoercionFunction(targetType, "toUByte")
+                KotlinBuiltIns.isUShort(targetType) -> invokeUnsignedIntegerCoercionFunction(targetType, "toUShort")
+                KotlinBuiltIns.isUInt(targetType) -> invokeUnsignedIntegerCoercionFunction(targetType, "toUInt")
+                KotlinBuiltIns.isULong(targetType) -> invokeUnsignedIntegerCoercionFunction(targetType, "toULong")
+                else -> throw AssertionError("Unexpected target type for integer coercion: $targetType")
+            }
+        }
+    }
+
+    private fun IrExpression.invokeIntegerCoercionFunction(targetType: KotlinType, coercionFunName: String): IrExpression {
+        val coercionFunction = builtIns.int.unsubstitutedMemberScope.findSingleFunction(Name.identifier(coercionFunName))
+        return IrCallImpl(
+            startOffset, endOffset,
+            targetType.toIrType(),
+            symbolTable.referenceSimpleFunction(coercionFunction),
+            typeArgumentsCount = 0, valueArgumentsCount = 0
+        ).also { irCall ->
+            irCall.dispatchReceiver = this
+        }
+    }
+
+    private fun IrExpression.invokeUnsignedIntegerCoercionFunction(targetType: KotlinType, coercionFunName: String): IrExpression {
+        // 'toUByte', 'toUShort', 'toUInt', 'toULong' are top-level extension functions in 'kotlin' package.
+        // There are several such functions (one for each built-in integer type: Byte, Short, Int, Long),
+        // we need one that takes Int.
+        val coercionFunction = targetType.constructor.declarationDescriptor!!.module
+            .getPackage(KotlinBuiltIns.BUILT_INS_PACKAGE_FQ_NAME)
+            .memberScope.getContributedFunctions(Name.identifier(coercionFunName), NoLookupLocation.FROM_BACKEND)
+            .find {
+                val extensionReceiver = it.extensionReceiverParameter
+                extensionReceiver != null && extensionReceiver.type.isInt()
+            }
+            ?: throw AssertionError("Coercion function '$coercionFunName' not found")
+        return IrCallImpl(
+            startOffset, endOffset,
+            targetType.toIrType(),
+            symbolTable.referenceSimpleFunction(coercionFunction),
+            typeArgumentsCount = 0, valueArgumentsCount = 0
+        ).also { irCall ->
+            irCall.extensionReceiver = this
+        }
     }
 
     private fun KotlinType.isBuiltInIntegerType(): Boolean =

compiler/testData/ir/irText/expressions/genericConstructorCallWithTypeArguments.txt

@@ -4,8 +4,8 @@ FILE fqName:<root> fileName:/genericConstructorCallWithTypeArguments.kt
       RETURN type=kotlin.Nothing from='public final fun testSimple (): <root>.Box<kotlin.Long> declared in <root>'
         CONSTRUCTOR_CALL 'public constructor <init> (value: T of <root>.Box) [primary] declared in <root>.Box' type=<root>.Box<kotlin.Long> origin=null
           <class: T>: kotlin.Long
-          value: TYPE_OP type=kotlin.Long origin=IMPLICIT_INTEGER_COERCION typeOperand=kotlin.Long
-            CALL 'public final fun times (other: kotlin.Int): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=MUL
+          value: CALL 'public open fun toLong (): kotlin.Long declared in kotlin.Int' type=kotlin.Long origin=null
+            $this: CALL 'public final fun times (other: kotlin.Int): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=MUL
               $this: CONST Int type=kotlin.Int value=2
               other: CONST Int type=kotlin.Int value=3
   FUN name:testArray visibility:public modality:FINAL <T> (n:kotlin.Int, block:kotlin.Function0<T of <root>.testArray>) returnType:kotlin.Array<T of <root>.testArray> [inline]

compiler/testData/ir/irText/expressions/primitivesImplicitConversions.txt

@@ -29,8 +29,8 @@ FILE fqName:<root> fileName:/primitivesImplicitConversions.kt
   PROPERTY name:test4 visibility:public modality:FINAL [val]
     FIELD PROPERTY_BACKING_FIELD name:test4 type:kotlin.Long visibility:private [final,static]
       EXPRESSION_BODY
-        TYPE_OP type=kotlin.Long origin=IMPLICIT_INTEGER_COERCION typeOperand=kotlin.Long
-          CALL 'public final fun unaryMinus (): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=null
+        CALL 'public open fun toLong (): kotlin.Long declared in kotlin.Int' type=kotlin.Long origin=null
+          $this: CALL 'public final fun unaryMinus (): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=null
             $this: CONST Int type=kotlin.Int value=42
     FUN DEFAULT_PROPERTY_ACCESSOR name:<get-test4> visibility:public modality:FINAL <> () returnType:kotlin.Long
       correspondingProperty: PROPERTY name:test4 visibility:public modality:FINAL [val]
@@ -40,8 +40,8 @@ FILE fqName:<root> fileName:/primitivesImplicitConversions.kt
   PROPERTY name:test5 visibility:public modality:FINAL [val]
     FIELD PROPERTY_BACKING_FIELD name:test5 type:kotlin.Short visibility:private [final,static]
       EXPRESSION_BODY
-        TYPE_OP type=kotlin.Short origin=IMPLICIT_INTEGER_COERCION typeOperand=kotlin.Short
-          CALL 'public final fun unaryMinus (): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=null
+        CALL 'public open fun toShort (): kotlin.Short declared in kotlin.Int' type=kotlin.Short origin=null
+          $this: CALL 'public final fun unaryMinus (): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=null
             $this: CONST Int type=kotlin.Int value=42
     FUN DEFAULT_PROPERTY_ACCESSOR name:<get-test5> visibility:public modality:FINAL <> () returnType:kotlin.Short
       correspondingProperty: PROPERTY name:test5 visibility:public modality:FINAL [val]
@@ -51,8 +51,8 @@ FILE fqName:<root> fileName:/primitivesImplicitConversions.kt
   PROPERTY name:test6 visibility:public modality:FINAL [val]
     FIELD PROPERTY_BACKING_FIELD name:test6 type:kotlin.Byte visibility:private [final,static]
       EXPRESSION_BODY
-        TYPE_OP type=kotlin.Byte origin=IMPLICIT_INTEGER_COERCION typeOperand=kotlin.Byte
-          CALL 'public final fun unaryMinus (): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=null
+        CALL 'public open fun toByte (): kotlin.Byte declared in kotlin.Int' type=kotlin.Byte origin=null
+          $this: CALL 'public final fun unaryMinus (): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=null
             $this: CONST Int type=kotlin.Int value=42
     FUN DEFAULT_PROPERTY_ACCESSOR name:<get-test6> visibility:public modality:FINAL <> () returnType:kotlin.Byte
       correspondingProperty: PROPERTY name:test6 visibility:public modality:FINAL [val]
@@ -70,22 +70,22 @@ FILE fqName:<root> fileName:/primitivesImplicitConversions.kt
       VAR name:test4 type:kotlin.Long? [val]
         CONST Long type=kotlin.Long value=-1
       VAR name:test5 type:kotlin.Long? [val]
-        TYPE_OP type=kotlin.Long origin=IMPLICIT_INTEGER_COERCION typeOperand=kotlin.Long
-          CALL 'public final fun unaryMinus (): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=null
+        CALL 'public open fun toLong (): kotlin.Long declared in kotlin.Int' type=kotlin.Long origin=null
+          $this: CALL 'public final fun unaryMinus (): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=null
             $this: CONST Int type=kotlin.Int value=1
       VAR name:test6 type:kotlin.Short? [val]
-        TYPE_OP type=kotlin.Short origin=IMPLICIT_INTEGER_COERCION typeOperand=kotlin.Short
-          CALL 'public final fun unaryMinus (): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=null
+        CALL 'public open fun toShort (): kotlin.Short declared in kotlin.Int' type=kotlin.Short origin=null
+          $this: CALL 'public final fun unaryMinus (): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=null
             $this: CONST Int type=kotlin.Int value=1
       VAR name:test7 type:kotlin.Byte? [val]
-        TYPE_OP type=kotlin.Byte origin=IMPLICIT_INTEGER_COERCION typeOperand=kotlin.Byte
-          CALL 'public final fun unaryMinus (): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=null
+        CALL 'public open fun toByte (): kotlin.Byte declared in kotlin.Int' type=kotlin.Byte origin=null
+          $this: CALL 'public final fun unaryMinus (): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=null
             $this: CONST Int type=kotlin.Int value=1
   FUN name:testImplicitArguments visibility:public modality:FINAL <> (x:kotlin.Long) returnType:kotlin.Unit
     VALUE_PARAMETER name:x index:0 type:kotlin.Long
       EXPRESSION_BODY
-        TYPE_OP type=kotlin.Long origin=IMPLICIT_INTEGER_COERCION typeOperand=kotlin.Long
-          CALL 'public final fun unaryMinus (): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=null
+        CALL 'public open fun toLong (): kotlin.Long declared in kotlin.Int' type=kotlin.Long origin=null
+          $this: CALL 'public final fun unaryMinus (): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=null
             $this: CONST Int type=kotlin.Int value=1
     BLOCK_BODY
   CLASS CLASS name:TestImplicitArguments modality:FINAL visibility:public superTypes:[kotlin.Any]
@@ -93,8 +93,8 @@ FILE fqName:<root> fileName:/primitivesImplicitConversions.kt
     CONSTRUCTOR visibility:public <> (x:kotlin.Long) returnType:<root>.TestImplicitArguments [primary]
       VALUE_PARAMETER name:x index:0 type:kotlin.Long
         EXPRESSION_BODY
-          TYPE_OP type=kotlin.Long origin=IMPLICIT_INTEGER_COERCION typeOperand=kotlin.Long
-            CALL 'public final fun unaryMinus (): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=null
+          CALL 'public open fun toLong (): kotlin.Long declared in kotlin.Int' type=kotlin.Long origin=null
+            $this: CALL 'public final fun unaryMinus (): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=null
               $this: CONST Int type=kotlin.Int value=1
       BLOCK_BODY
         DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'

compiler/testData/ir/irText/expressions/signedToUnsignedConversions_test.txt

@@ -98,27 +98,27 @@ FILE fqName:<root> fileName:/signedToUnsignedConversions_test.kt
   FUN name:test visibility:public modality:FINAL <> () returnType:kotlin.Unit
     BLOCK_BODY
       CALL 'public final fun takeUByte (u: kotlin.UByte): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
-        u: TYPE_OP type=kotlin.UByte origin=IMPLICIT_INTEGER_COERCION typeOperand=kotlin.UByte
-          CALL 'public final fun <get-IMPLICIT_INT> (): kotlin.Int declared in <root>' type=kotlin.Int origin=GET_PROPERTY
+        u: CALL 'public final fun toUByte (): kotlin.UByte [inline] declared in kotlin' type=kotlin.UByte origin=null
+          $receiver: CALL 'public final fun <get-IMPLICIT_INT> (): kotlin.Int declared in <root>' type=kotlin.Int origin=GET_PROPERTY
       CALL 'public final fun takeUByte (u: kotlin.UByte): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
-        u: TYPE_OP type=kotlin.UByte origin=IMPLICIT_INTEGER_COERCION typeOperand=kotlin.UByte
-          CALL 'public final fun <get-EXPLICIT_INT> (): kotlin.Int declared in <root>' type=kotlin.Int origin=GET_PROPERTY
+        u: CALL 'public final fun toUByte (): kotlin.UByte [inline] declared in kotlin' type=kotlin.UByte origin=null
+          $receiver: CALL 'public final fun <get-EXPLICIT_INT> (): kotlin.Int declared in <root>' type=kotlin.Int origin=GET_PROPERTY
       CALL 'public final fun takeUShort (u: kotlin.UShort): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
-        u: TYPE_OP type=kotlin.UShort origin=IMPLICIT_INTEGER_COERCION typeOperand=kotlin.UShort
-          CALL 'public final fun <get-IMPLICIT_INT> (): kotlin.Int declared in <root>' type=kotlin.Int origin=GET_PROPERTY
+        u: CALL 'public final fun toUShort (): kotlin.UShort [inline] declared in kotlin' type=kotlin.UShort origin=null
+          $receiver: CALL 'public final fun <get-IMPLICIT_INT> (): kotlin.Int declared in <root>' type=kotlin.Int origin=GET_PROPERTY
       CALL 'public final fun takeUShort (u: kotlin.UShort): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
-        u: TYPE_OP type=kotlin.UShort origin=IMPLICIT_INTEGER_COERCION typeOperand=kotlin.UShort
-          CALL 'public final fun <get-BIGGER_THAN_UBYTE> (): kotlin.Int declared in <root>' type=kotlin.Int origin=GET_PROPERTY
+        u: CALL 'public final fun toUShort (): kotlin.UShort [inline] declared in kotlin' type=kotlin.UShort origin=null
+          $receiver: CALL 'public final fun <get-BIGGER_THAN_UBYTE> (): kotlin.Int declared in <root>' type=kotlin.Int origin=GET_PROPERTY
       CALL 'public final fun takeUInt (u: kotlin.UInt): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
-        u: TYPE_OP type=kotlin.UInt origin=IMPLICIT_INTEGER_COERCION typeOperand=kotlin.UInt
-          CALL 'public final fun <get-IMPLICIT_INT> (): kotlin.Int declared in <root>' type=kotlin.Int origin=GET_PROPERTY
+        u: CALL 'public final fun toUInt (): kotlin.UInt [inline] declared in kotlin' type=kotlin.UInt origin=null
+          $receiver: CALL 'public final fun <get-IMPLICIT_INT> (): kotlin.Int declared in <root>' type=kotlin.Int origin=GET_PROPERTY
       CALL 'public final fun takeULong (u: kotlin.ULong): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
-        u: TYPE_OP type=kotlin.ULong origin=IMPLICIT_INTEGER_COERCION typeOperand=kotlin.ULong
-          CALL 'public final fun <get-IMPLICIT_INT> (): kotlin.Int declared in <root>' type=kotlin.Int origin=GET_PROPERTY
+        u: CALL 'public final fun toULong (): kotlin.ULong [inline] declared in kotlin' type=kotlin.ULong origin=null
+          $receiver: CALL 'public final fun <get-IMPLICIT_INT> (): kotlin.Int declared in <root>' type=kotlin.Int origin=GET_PROPERTY
       CALL 'public final fun takeUBytes (vararg u: kotlin.UByte): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
         u: VARARG type=kotlin.UByteArray varargElementType=kotlin.UByte
-          TYPE_OP type=kotlin.UByte origin=IMPLICIT_INTEGER_COERCION typeOperand=kotlin.UByte
-            CALL 'public final fun <get-IMPLICIT_INT> (): kotlin.Int declared in <root>' type=kotlin.Int origin=GET_PROPERTY
-          TYPE_OP type=kotlin.UByte origin=IMPLICIT_INTEGER_COERCION typeOperand=kotlin.UByte
-            CALL 'public final fun <get-EXPLICIT_INT> (): kotlin.Int declared in <root>' type=kotlin.Int origin=GET_PROPERTY
+          CALL 'public final fun toUByte (): kotlin.UByte [inline] declared in kotlin' type=kotlin.UByte origin=null
+            $receiver: CALL 'public final fun <get-IMPLICIT_INT> (): kotlin.Int declared in <root>' type=kotlin.Int origin=GET_PROPERTY
+          CALL 'public final fun toUByte (): kotlin.UByte [inline] declared in kotlin' type=kotlin.UByte origin=null
+            $receiver: CALL 'public final fun <get-EXPLICIT_INT> (): kotlin.Int declared in <root>' type=kotlin.Int origin=GET_PROPERTY
           CONST Byte type=kotlin.UByte value=42