[Wasm] Generate stdlib WasmOp based on WasmOp from Wasm IR

libraries/tools/kotlin-stdlib-gen/src/generators/GenerateStandardLib.kt

@@ -71,6 +71,8 @@ fun main(args: Array<String>) {
         }
         targetDir.resolve("_${source.name.capitalize()}$platformSuffix.kt")
     }
+
+    targetBaseDirs[KotlinTarget.WASM]?.let { generateWasmOps(it) }
 }
 
 fun File.resolveExistingDir(subpath: String) = resolve(subpath).also { it.requireExistingDir() }

libraries/tools/kotlin-stdlib-gen/src/generators/GenerateWasmOps.kt

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package generators
+
+import org.jetbrains.kotlin.wasm.ir.WasmOp
+import templates.COMMON_AUTOGENERATED_WARNING
+import templates.COPYRIGHT_NOTICE
+import java.io.File
+import java.io.FileWriter
+
+fun generateWasmOps(targetDir: File) {
+    FileWriter(targetDir.resolve("_WasmOp.kt")).use { writer ->
+        writer.appendLine(COPYRIGHT_NOTICE)
+        writer.appendLine("package kotlin.wasm.internal")
+        writer.appendLine()
+        writer.appendLine(COMMON_AUTOGENERATED_WARNING)
+        writer.appendLine()
+        writer.appendLine(
+            """
+            @ExcludedFromCodegen
+            @Suppress("unused")
+            @Target(AnnotationTarget.FUNCTION)
+            @Retention(AnnotationRetention.BINARY)
+            internal annotation class WasmOp(val name: String) {
+                companion object {
+            """.trimIndent()
+        )
+        WasmOp.values().forEach { op ->
+            writer.appendLine("        const val $op = \"$op\"")
+        }
+        writer.appendLine(
+            """
+                }
+            }
+            """.trimIndent()
+        )
+    }
+}