Added "start" function between the C launcher and Kotlin "main"

backend.native/build.gradle

@@ -162,7 +162,6 @@ dependencies {
 
 build.dependsOn 'compilerClasses','cli_bcClasses','bc_frontendClasses'
 
-
 task stdlib(type: JavaExec) {
     main 'org.jetbrains.kotlin.cli.bc.K2NativeKt'
     classpath configurations.cli_bc
@@ -182,6 +181,27 @@ task stdlib(type: JavaExec) {
     environment 'LD_LIBRARY_PATH' : "${llvmDir}/lib:${project.buildDir}/nativelibs"
 }
 
+task start(type: JavaExec) {
+    main 'org.jetbrains.kotlin.cli.bc.K2NativeKt'
+    classpath configurations.cli_bc
+
+    args project(':runtime').file('src/launcher/kotlin')
+
+    args '-library', project(':runtime').file('build/stdlib.kt.bc')
+
+    args '-output', project(':runtime').file('build/start.kt.bc')
+
+    jvmArgs '-ea', "-Djava.library.path=${project.buildDir}/nativelibs"
+
+    dependsOn 'stdlib'
+    outputs.file(project(':runtime').file('build/start.kt.bc'))
+
+    doFirst {
+    args '-runtime', project(':runtime').build.outputs.files.singleFile
+    }
+    environment 'LD_LIBRARY_PATH' : "${llvmDir}/lib:${project.buildDir}/nativelibs"
+}
+
 task run(type: JavaExec) {
    main 'org.jetbrains.kotlin.cli.bc.K2NativeKt'
    classpath configurations.cli_bc

backend.native/tests/build.gradle

@@ -13,6 +13,7 @@ abstract class KonanTest extends DefaultTask {
     def llvmLlc = llvmTool("llc")
     def runtimeBc = new File("${runtimeProject.buildDir.canonicalPath}/runtime.bc")
     def launcherBc = new File("${runtimeProject.buildDir.canonicalPath}/launcher.bc")
+    def startKtBc = new File("${runtimeProject.buildDir.canonicalPath}/start.kt.bc")
     def stdlibKtBc = new File("${runtimeProject.buildDir.canonicalPath}/stdlib.kt.bc")
     def mainC = 'main.c'
     String goldValue = null
@@ -136,7 +137,7 @@ class UnitKonanTest extends KonanTest {
 class RunKonanTest extends KonanTest {
     void compileTest(File sourceS, File runtimeS, File libraryPath, File exe) {
         project.execClang {
-            commandLine "clang++", launcherBc.absolutePath, runtimeS.absolutePath, stdlibKtBc.absolutePath, sourceS.absolutePath,
+            commandLine "clang++", launcherBc.absolutePath, startKtBc.absolutePath, runtimeS.absolutePath, stdlibKtBc.absolutePath, sourceS.absolutePath,
                     "-o", exe.absolutePath, linkDl(), linkM(), rdynamic(), '-xc'
         }
     }
@@ -611,3 +612,8 @@ task args0(type: RunKonanTest) {
     source = "runtime/basic/args0.kt"
 }
 
+task main_exception(type: RunKonanTest) {
+    goldValue = "Uncaught exception from kotlin main: Throwable\n"
+    source = "runtime/basic/main_exception.kt"
+}
+

runtime/src/launcher/cpp/launcher.cpp

@@ -22,14 +22,14 @@ ArrayHeader* setupArgs(int argc, char** argv) {
     return args;
 }
         
-extern "C" void konanMain(void*) asm("_kfun:main(Array<String>)");
+extern "C" void konanStart(void*) asm("_kfun:start(Array<String>)");
 
 int main(int argc, char** argv) {
 
     InitMemory();
 
     ArrayHeader* args = setupArgs(argc, argv);
-    konanMain(args);
+    konanStart(args);
 
     // Yes, we have to follow Java convention and return zero.
     return 0;

runtime/src/launcher/kotlin/konan/start.kt

@@ -0,0 +1,16 @@
+
+external fun main(args: Array<String>)
+
+fun start(args: Array<String>) {
+    try {
+
+        // This is kotlin program main entry point
+        main(args)
+
+    } catch (e: Throwable) {
+        // TODO: Remove .toString() when println is more capabe, 
+        // and may be add some more info.
+        print("Uncaught exception from kotlin main: ")
+        println(e.toString())
+    }
+}