[WASM] Initial infrastructure

- New module ":compiler:backend.wasm"
    - Initial compiler infra (driver, phaser, context)
    - Subset of Wasm AST
    - Skeleton of IR -> Wasm AST
    - Wasm AST -> WAT transformer

- Testing infra

- SpiderMonkey jsshell tool

libraries/stdlib/wasm/builtins/native/kotlin/Boolean.kt

@@ -13,6 +13,9 @@
 
 package kotlin
 
+import kotlin.wasm.internal.WasmInstruction
+import kotlin.wasm.internal.wasm_i32_compareTo
+
 /**
  * Represents a value which is either `true` or `false`. On the JVM, non-nullable values of this type are
  * represented as values of the primitive type `boolean`.
@@ -21,26 +24,34 @@ public class Boolean private constructor() : Comparable<Boolean> {
     /**
      * Returns the inverse of this boolean.
      */
+    @WasmInstruction(WasmInstruction.I32_EQZ)
     public operator fun not(): Boolean
 
     /**
      * Performs a logical `and` operation between this Boolean and the [other] one. Unlike the `&&` operator,
      * this function does not perform short-circuit evaluation. Both `this` and [other] will always be evaluated.
      */
+    @WasmInstruction(WasmInstruction.I32_AND)
     public infix fun and(other: Boolean): Boolean
 
     /**
      * Performs a logical `or` operation between this Boolean and the [other] one. Unlike the `||` operator,
      * this function does not perform short-circuit evaluation. Both `this` and [other] will always be evaluated.
      */
+    @WasmInstruction(WasmInstruction.I32_OR)
     public infix fun or(other: Boolean): Boolean
 
     /**
      * Performs a logical `xor` operation between this Boolean and the [other] one.
      */
+    @WasmInstruction(WasmInstruction.I32_XOR)
     public infix fun xor(other: Boolean): Boolean
 
-    public override fun compareTo(other: Boolean): Int
+    public override fun compareTo(other: Boolean): Int =
+        wasm_i32_compareTo(this.asInt(), other.asInt())
+
+    @WasmInstruction(WasmInstruction.NOP)
+    internal fun asInt(): Int
 
     @SinceKotlin("1.3")
     companion object {}

libraries/stdlib/wasm/builtins/native/kotlin/Char.kt

@@ -3,16 +3,15 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
-@file:Suppress(
-    "NON_ABSTRACT_FUNCTION_WITH_NO_BODY",
-    "MUST_BE_INITIALIZED_OR_BE_ABSTRACT",
-    "EXTERNAL_TYPE_EXTENDS_NON_EXTERNAL_TYPE",
-    "PRIMARY_CONSTRUCTOR_DELEGATION_CALL_EXPECTED",
-    "WRONG_MODIFIER_TARGET"
-)
+@file:Suppress("OVERRIDE_BY_INLINE", "NOTHING_TO_INLINE")
 
 package kotlin
 
+import kotlin.wasm.internal.ExcludedFromCodegen
+import kotlin.wasm.internal.WasmInstruction
+import kotlin.wasm.internal.implementedAsIntrinsic
+import kotlin.wasm.internal.wasm_i32_compareTo
+
 /**
  * Represents a 16-bit Unicode character.
  *
@@ -25,39 +24,56 @@ public class Char private constructor() : Comparable<Char> {
      * Returns zero if this value is equal to the specified other value, a negative number if it's less than other,
      * or a positive number if it's greater than other.
      */
-    public override fun compareTo(other: Char): Int
+    public override inline fun compareTo(other: Char): Int =
+        wasm_i32_compareTo(this.toInt(), other.toInt())
 
     /** Adds the other Int value to this value resulting a Char. */
-    public operator fun plus(other: Int): Char
+    public inline operator fun plus(other: Int): Char =
+        (this.toInt() + other).toChar()
 
     /** Subtracts the other Char value from this value resulting an Int. */
-    public operator fun minus(other: Char): Int
+    public inline operator fun minus(other: Char): Int =
+        (this.toInt() - other.toInt())
+
     /** Subtracts the other Int value from this value resulting a Char. */
-    public operator fun minus(other: Int): Char
+    public inline operator fun minus(other: Int): Char =
+        (this.toInt() - other).toChar()
 
     /** Increments this value. */
-    public operator fun inc(): Char
+    public inline operator fun inc(): Char =
+        (this.toInt() + 1).toChar()
+
     /** Decrements this value. */
-    public operator fun dec(): Char
+    public inline operator fun dec(): Char =
+        (this.toInt() - 1).toChar()
 
 //    /** Creates a range from this value to the specified [other] value. */
 //    public operator fun rangeTo(other: Char): CharRange
 
     /** Returns the value of this character as a `Byte`. */
-    public fun toByte(): Byte
+    public inline fun toByte(): Byte =
+        this.toInt().toByte()
     /** Returns the value of this character as a `Char`. */
-    public fun toChar(): Char
+    public inline fun toChar(): Char =
+        this
     /** Returns the value of this character as a `Short`. */
-    public fun toShort(): Short
+    public inline fun toShort(): Short =
+        this.toInt().toShort()
     /** Returns the value of this character as a `Int`. */
-    public fun toInt(): Int
+    @WasmInstruction(WasmInstruction.NOP)
+    public fun toInt(): Int =
+        implementedAsIntrinsic
     /** Returns the value of this character as a `Long`. */
-    public fun toLong(): Long
+    public inline fun toLong(): Long =
+        this.toInt().toLong()
     /** Returns the value of this character as a `Float`. */
-    public fun toFloat(): Float
+    public inline fun toFloat(): Float =
+        this.toInt().toFloat()
     /** Returns the value of this character as a `Double`. */
-    public fun toDouble(): Double
+    public inline fun toDouble(): Double =
+        this.toInt().toDouble()
 
+    @ExcludedFromCodegen
     companion object {
         /**
          * The minimum value of a character code unit.

libraries/stdlib/wasm/builtins/native/kotlin/Library.kt

@@ -6,7 +6,7 @@
     "NON_MEMBER_FUNCTION_NO_BODY",
     "REIFIED_TYPE_PARAMETER_NO_INLINE"
 )
-@file:ExcludedFromCodegen
+@file:kotlin.wasm.internal.ExcludedFromCodegen
 
 package kotlin
 

libraries/stdlib/wasm/builtins/native/kotlin/String.kt

@@ -13,19 +13,25 @@
 
 package kotlin
 
+import kotlin.wasm.internal.ExcludedFromCodegen
+import kotlin.wasm.internal.WasmImport
+
 /**
  * The `String` class represents character strings. All string literals in Kotlin programs, such as `"abc"`, are
  * implemented as instances of this class.
  */
 public class String : Comparable<String>, CharSequence {
+    @ExcludedFromCodegen
     companion object {}
     
     /**
      * Returns a string obtained by concatenating this string with the string representation of the given [other] object.
      */
+    @WasmImport("runtime", "String_plus")
     public operator fun plus(other: Any?): String
 
     public override val length: Int
+        @WasmImport("runtime", "String_getLength") get
 
     /**
      * Returns the character of this string at the specified [index].
@@ -33,9 +39,20 @@ public class String : Comparable<String>, CharSequence {
      * If the [index] is out of bounds of this string, throws an [IndexOutOfBoundsException] except in Kotlin/JS
      * where the behavior is unspecified.
      */
+    @WasmImport("runtime", "String_getChar")
     public override fun get(index: Int): Char
 
+    @ExcludedFromCodegen
     public override fun subSequence(startIndex: Int, endIndex: Int): CharSequence
 
+    @WasmImport("runtime", "String_compareTo")
     public override fun compareTo(other: String): Int
-}
+
+    @ExcludedFromCodegen
+    public override fun equals(other: Any?): Boolean
+
+    public override fun toString(): String = this
+
+    @ExcludedFromCodegen
+    public override fun hashCode(): Int
+}