[Wasm] Remove wasm_ref_cast and use wasm_ref_cast_null inside the compiler

compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/WasmSymbols.kt

@@ -180,7 +180,7 @@ class WasmSymbols(
     val refIsNull = getInternalFunction("wasm_ref_is_null")
     val externRefIsNull = getInternalFunction("wasm_externref_is_null")
     val refTest = getInternalFunction("wasm_ref_test")
-    val refCast = getInternalFunction("wasm_ref_cast")
+    val refCastNull = getInternalFunction("wasm_ref_cast_null")
     val wasmArrayCopy = getInternalFunction("wasm_array_copy")
     val wasmArrayNewData0 = getInternalFunction("array_new_data0")
 

compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/dce/WasmUsefulDeclarationProcessor.kt

@@ -15,7 +15,6 @@ import org.jetbrains.kotlin.ir.expressions.*
 import org.jetbrains.kotlin.ir.types.*
 import org.jetbrains.kotlin.ir.util.*
 import org.jetbrains.kotlin.utils.addToStdlib.firstIsInstanceOrNull
-import org.jetbrains.kotlin.wasm.ir.*
 
 internal class WasmUsefulDeclarationProcessor(
     override val context: WasmBackendContext,
@@ -59,7 +58,7 @@ internal class WasmUsefulDeclarationProcessor(
 
             context.wasmSymbols.wasmClassId,
             context.wasmSymbols.wasmInterfaceId,
-            context.wasmSymbols.refCast,
+            context.wasmSymbols.refCastNull,
             context.wasmSymbols.refTest,
             context.wasmSymbols.boxIntrinsic,
             context.wasmSymbols.wasmArrayCopy -> {
@@ -183,4 +182,4 @@ internal class WasmUsefulDeclarationProcessor(
     }
 
     override fun isExported(declaration: IrDeclaration): Boolean = declaration.isJsExport()
-}
+}

compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/ir2wasm/BodyGenerator.kt

@@ -392,7 +392,7 @@ class BodyGenerator(
                 generateExpression(receiver)
 
                 //TODO: check why it could be needed
-                generateRefCast(receiver.type, klass.defaultType)
+                generateRefNullCast(receiver.type, klass.defaultType)
 
                 body.buildStructGet(context.referenceGcType(klass.symbol), WasmSymbol(0))
                 body.buildStructGet(context.referenceVTableGcType(klass.symbol), WasmSymbol(vfSlot))
@@ -428,7 +428,7 @@ class BodyGenerator(
             body.buildGetUnit()
     }
 
-    private fun generateRefCast(fromType: IrType, toType: IrType) {
+    private fun generateRefNullCast(fromType: IrType, toType: IrType) {
         if (!isDownCastAlwaysSuccessInRuntime(fromType, toType)) {
             body.buildRefCastNullStatic(
                 toType = context.referenceGcType(toType.getRuntimeClass(irBuiltIns).symbol)
@@ -507,8 +507,8 @@ class BodyGenerator(
                 }
             }
 
-            wasmSymbols.refCast -> {
-                generateRefCast(
+            wasmSymbols.refCastNull -> {
+                generateRefNullCast(
                     fromType = call.getValueArgument(0)!!.type,
                     toType = call.getTypeArgument(0)!!
                 )
@@ -540,7 +540,7 @@ class BodyGenerator(
                 val klass: IrClass = backendContext.inlineClassesUtils.getInlinedClass(toType)!!
                 val field = getInlineClassBackingField(klass)
 
-                generateRefCast(fromType, toType)
+                generateRefNullCast(fromType, toType)
                 generateInstanceFieldAccess(field)
             }
 
@@ -722,7 +722,7 @@ class BodyGenerator(
 
         // REF -> REF -> REF_CAST
         if (!expectedIsPrimitive) {
-            generateRefCast(actualTypeErased, expectedTypeErased)
+            generateRefNullCast(actualTypeErased, expectedTypeErased)
         }
     }
 

compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/lower/JsInteropFunctionsLowering.kt

@@ -22,7 +22,6 @@ import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.expressions.IrBody
 import org.jetbrains.kotlin.ir.expressions.IrCall
 import org.jetbrains.kotlin.ir.expressions.IrExpression
-import org.jetbrains.kotlin.ir.expressions.IrStatementOriginImpl
 import org.jetbrains.kotlin.ir.expressions.impl.IrInstanceInitializerCallImpl
 import org.jetbrains.kotlin.ir.types.*
 import org.jetbrains.kotlin.ir.util.*
@@ -674,7 +673,7 @@ class JsInteropFunctionsLowering(val context: WasmBackendContext) : DeclarationT
     ) : InteropTypeAdapter {
         override val fromType: IrType = context.wasmSymbols.wasmDataRefType
         override fun adapt(expression: IrExpression, builder: IrBuilderWithScope): IrExpression {
-            val call = builder.irCall(context.wasmSymbols.refCast)
+            val call = builder.irCall(context.wasmSymbols.refCastNull)
             call.putValueArgument(0, expression)
             call.putTypeArgument(0, toType)
             return call
@@ -772,4 +771,4 @@ class JsInteropFunctionCallsLowering(val context: WasmBackendContext) : BodyLowe
             }
         })
     }
-}
+}

compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/lower/WasmTypeOperatorLowering.kt

@@ -242,7 +242,7 @@ class WasmBaseTypeOperatorTransformer(val context: WasmBackendContext) : IrEleme
             }
         }
 
-        return builder.irCall(symbols.refCast, type = toType).apply {
+        return builder.irCall(symbols.refCastNull, type = toType).apply {
             putTypeArgument(0, toType)
             putValueArgument(0, value)
         }

libraries/stdlib/wasm/internal/kotlin/wasm/internal/WasmInstructions.kt

@@ -19,15 +19,12 @@ import kotlin.wasm.internal.ExternalInterfaceType
 internal fun wasm_unreachable(): Nothing =
     implementedAsIntrinsic
 
-internal fun <To> wasm_ref_cast(a: Any?): To =
-    implementedAsIntrinsic
-
 @Suppress("REIFIED_TYPE_PARAMETER_NO_INLINE")
-@WasmOp(WasmOp.REF_CAST_NULL)
 internal fun <reified To> wasm_ref_cast_null(a: Any?): To =
     implementedAsIntrinsic
 
-internal fun <To> wasm_ref_test(a: Any?): Boolean =
+@Suppress("REIFIED_TYPE_PARAMETER_NO_INLINE")
+internal fun <reified To> wasm_ref_test(a: Any?): Boolean =
     implementedAsIntrinsic
 
 @Suppress("REIFIED_TYPE_PARAMETER_NO_INLINE")