Introduced support for javascript Math and Kotlin Double to WASM32.

Implemented jsinterop tool for interaction with js math.

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/LinkStage.kt

@@ -278,13 +278,20 @@ internal open class WasmPlatform(distribution: Distribution)
             private fun javaScriptLink(jsFiles: List<String>, executable: String): String {
                 val linkedJavaScript = File("$executable.js")
 
-                val linkerStub = "var konan = { libraries: [] };\n"
+                val linkerHeader = "var konan = { libraries: [] };\n"
+                val linkerFooter = """|if (isBrowser()) {
+                                      |   konan.moduleEntry([]);
+                                      |} else {
+                                      |   konan.moduleEntry(arguments);
+                                      |}""".trimMargin()
 
-                linkedJavaScript.writeBytes(linkerStub.toByteArray());
+                linkedJavaScript.writeBytes(linkerHeader.toByteArray());
 
                 jsFiles.forEach {
                     linkedJavaScript.appendBytes(File(it).readBytes())
                 }
+
+                linkedJavaScript.appendBytes(linkerFooter.toByteArray());
                 return linkedJavaScript.name
             }
         }

backend.native/tests/build.gradle

@@ -2370,6 +2370,18 @@ if (isMac()) {
     }
 }
 
+task jsinterop_math(type: RunStandaloneKonanTest) {
+    doFirst {
+        // TODO: We probably need a NativeInteropPlugin for jsinterop?
+        "jsinterop -pkg kotlinx.interop.wasm.math -o $buildDir/jsmath -target wasm32".execute()
+
+    }
+    disabled = (project.testTarget != 'wasm32')
+    goldValue = "e = 2.718281828459045, pi = 3.141592653589793, sin(pi) = 1.2246467991473532E-16, sin(pi/2) = 1.0, ln(1) = 0.0, ln(e) = 1.0\n"
+    source = "jsinterop/math.kt"
+    flags = ["-r", "$buildDir", "-l", "jsmath"]
+}
+
 task produce_dynamic(type: DynamicKonanTest) {
     disabled = (project.testTarget != null && project.testTarget != project.hostName)
     source = "produce_dynamic/simple/hello.kt"

backend.native/tests/jsinterop/math.kt

@@ -0,0 +1,16 @@
+import kotlinx.interop.wasm.math.*
+import kotlinx.wasm.jsinterop.*
+
+fun main(args: Array<String>) {
+
+    val e = Math.E
+    val pi = Math.PI
+
+    val sin_pi = Math.sin(pi)
+    val sin_pi_2 = Math.sin(pi/2)
+    val ln_1 = Math.log(1.0)
+    val ln_e = Math.log(e)
+
+    println("e = $e, pi = $pi, sin(pi) = $sin_pi, sin(pi/2) = $sin_pi_2, ln(1) = $ln_1, ln(e) = $ln_e")
+}
+