[WASM] Caching string literals in global pool

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

@@ -9,7 +9,7 @@ import kotlin.wasm.internal.reftypes.anyref
 
 internal external interface ExternalInterfaceType
 
-internal class JsExternalBox(val ref: ExternalInterfaceType) {
+internal class JsExternalBox @WasmPrimitiveConstructor constructor(val ref: ExternalInterfaceType) {
     override fun toString(): String =
         externrefToString(ref)
 
@@ -20,8 +20,13 @@ internal class JsExternalBox(val ref: ExternalInterfaceType) {
             false
         }
 
-    override fun hashCode(): Int =
-        externrefHashCode(ref)
+    override fun hashCode(): Int {
+        var hashCode = _hashCode
+        if (hashCode != 0) return hashCode
+        hashCode = externrefHashCode(ref)
+        _hashCode = hashCode
+        return hashCode
+    }
 }
 
 //language=js
@@ -218,7 +223,7 @@ internal fun jsToKotlinStringAdapter(x: ExternalInterfaceType): String {
     val stringLength = stringLength(x)
     val dstArray = WasmCharArray(stringLength)
     if (stringLength == 0) {
-        return String(dstArray)
+        return dstArray.createString()
     }
     val maxStringLength = unsafeGetScratchRawMemorySize() / CHAR_SIZE_BYTES
 
@@ -233,7 +238,7 @@ internal fun jsToKotlinStringAdapter(x: ExternalInterfaceType): String {
 
     jsExportStringToWasm(x, srcStartIndex, stringLength - srcStartIndex, memBuffer)
     unsafeRawMemoryToWasmCharArray(memBuffer, srcStartIndex, stringLength - srcStartIndex, dstArray)
-    return String(dstArray)
+    return dstArray.createString()
 }
 
 

libraries/stdlib/wasm/internal/kotlin/wasm/internal/Number2String.kt

@@ -64,7 +64,7 @@ internal fun itoa32(inputValue: Int, radix: Int): String {
     if (sign == 1)
         buf.set(0, CharCodes.MINUS.code.toChar())
 
-    return String(buf)
+    return buf.createString()
 }
 
 private fun utoaDecSimple(buffer: WasmCharArray, numInput: Int, offsetInput: Int) {
@@ -144,7 +144,7 @@ internal fun itoa64(inputValue: Long, radix: Int): String {
     if (sign == 1)
         buf.set(0, CharCodes.MINUS.code.toChar())
 
-    return String(buf)
+    return buf.createString()
 }
 
 // Count number of decimals for u64 values
@@ -178,7 +178,7 @@ internal fun dtoa(value: Double): String {
     val size = dtoaCore(buf, value)
     val ret = WasmCharArray(size)
     buf.copyInto(ret, 0, 0, size)
-    return String(ret)
+    return ret.createString()
 }
 
 private fun dtoaCore(buffer: WasmCharArray, valueInp: Double): Int {

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

@@ -80,4 +80,12 @@ internal class Void private constructor()
 // This is the only way to introduce Void type.
 @WasmOp(WasmOp.DROP)
 internal fun consumeAnyIntoVoid(a: Any?): Void =
-    implementedAsIntrinsic
+    implementedAsIntrinsic
+
+@ExcludedFromCodegen
+internal fun stringGetPoolSize(): Int =
+    implementedAsIntrinsic
+
+// This initializer is a special case in FieldInitializersLowering
+@EagerInitialization
+internal val stringPool: Array<String?> = arrayOfNulls(stringGetPoolSize())

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

@@ -10,9 +10,11 @@ package kotlin.wasm.internal
 internal const val TYPE_INFO_ELEMENT_SIZE = 4
 
 internal const val TYPE_INFO_TYPE_PACKAGE_NAME_LENGTH_OFFSET = 0
-internal const val TYPE_INFO_TYPE_PACKAGE_NAME_PRT_OFFSET = TYPE_INFO_TYPE_PACKAGE_NAME_LENGTH_OFFSET + TYPE_INFO_ELEMENT_SIZE
+internal const val TYPE_INFO_TYPE_PACKAGE_NAME_ID_OFFSET = TYPE_INFO_TYPE_PACKAGE_NAME_LENGTH_OFFSET + TYPE_INFO_ELEMENT_SIZE
+internal const val TYPE_INFO_TYPE_PACKAGE_NAME_PRT_OFFSET = TYPE_INFO_TYPE_PACKAGE_NAME_ID_OFFSET + TYPE_INFO_ELEMENT_SIZE
 internal const val TYPE_INFO_TYPE_SIMPLE_NAME_LENGTH_OFFSET = TYPE_INFO_TYPE_PACKAGE_NAME_PRT_OFFSET + TYPE_INFO_ELEMENT_SIZE
-internal const val TYPE_INFO_TYPE_SIMPLE_NAME_PRT_OFFSET = TYPE_INFO_TYPE_SIMPLE_NAME_LENGTH_OFFSET + TYPE_INFO_ELEMENT_SIZE
+internal const val TYPE_INFO_TYPE_SIMPLE_NAME_ID_OFFSET = TYPE_INFO_TYPE_SIMPLE_NAME_LENGTH_OFFSET + TYPE_INFO_ELEMENT_SIZE
+internal const val TYPE_INFO_TYPE_SIMPLE_NAME_PRT_OFFSET = TYPE_INFO_TYPE_SIMPLE_NAME_ID_OFFSET + TYPE_INFO_ELEMENT_SIZE
 internal const val TYPE_INFO_SUPER_TYPE_OFFSET = TYPE_INFO_TYPE_SIMPLE_NAME_PRT_OFFSET + TYPE_INFO_ELEMENT_SIZE
 internal const val TYPE_INFO_ITABLE_SIZE_OFFSET = TYPE_INFO_SUPER_TYPE_OFFSET + TYPE_INFO_ELEMENT_SIZE
 internal const val TYPE_INFO_ITABLE_OFFSET = TYPE_INFO_ITABLE_SIZE_OFFSET + TYPE_INFO_ELEMENT_SIZE
@@ -21,11 +23,13 @@ internal class TypeInfoData(val typeId: Int, val isInterface: Boolean, val packa
 
 internal fun getTypeInfoTypeDataByPtr(typeInfoPtr: Int): TypeInfoData {
     val fqNameLength = wasm_i32_load(typeInfoPtr + TYPE_INFO_TYPE_PACKAGE_NAME_LENGTH_OFFSET)
-    val fqNameLengthPtr = wasm_i32_load(typeInfoPtr + TYPE_INFO_TYPE_PACKAGE_NAME_PRT_OFFSET)
+    val fqNameId = wasm_i32_load(typeInfoPtr + TYPE_INFO_TYPE_PACKAGE_NAME_ID_OFFSET)
+    val fqNamePtr = wasm_i32_load(typeInfoPtr + TYPE_INFO_TYPE_PACKAGE_NAME_PRT_OFFSET)
     val simpleNameLength = wasm_i32_load(typeInfoPtr + TYPE_INFO_TYPE_SIMPLE_NAME_LENGTH_OFFSET)
+    val simpleNameId = wasm_i32_load(typeInfoPtr + TYPE_INFO_TYPE_SIMPLE_NAME_ID_OFFSET)
     val simpleNamePtr = wasm_i32_load(typeInfoPtr + TYPE_INFO_TYPE_SIMPLE_NAME_PRT_OFFSET)
-    val packageName = stringLiteral(fqNameLengthPtr, fqNameLength)
-    val simpleName = stringLiteral(simpleNamePtr, simpleNameLength)
+    val packageName = stringLiteral(fqNameId, fqNamePtr, fqNameLength, 0)
+    val simpleName = stringLiteral(simpleNameId, simpleNamePtr, simpleNameLength, 0)
     return TypeInfoData(typeInfoPtr, isInterface = false, packageName, simpleName)
 }
 

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

@@ -48,4 +48,13 @@ internal annotation class WasmAutoboxed
 
 @ExcludedFromCodegen
 internal val implementedAsIntrinsic: Nothing
-    get() = null!!
+    get() = null!!
+
+/**
+ * Indicates that annotated constructor is primitive
+ * i.e. has direct layout from it's parameters to object fields (except any's fields) and has no code
+ * In this case no need to call it during an object creation.
+ */
+@Target(AnnotationTarget.CONSTRUCTOR)
+@Retention(AnnotationRetention.BINARY)
+internal annotation class WasmPrimitiveConstructor