Ant: Add support for fork-mode

#KT-44293

ant/src/org/jetbrains/kotlin/ant/Kotlin2JvmTask.kt

@@ -16,9 +16,12 @@
 
 package org.jetbrains.kotlin.ant
 
-import org.apache.tools.ant.types.Path
-import org.apache.tools.ant.types.Reference
+import org.apache.tools.ant.BuildException
+import org.apache.tools.ant.taskdefs.Execute
+import org.apache.tools.ant.taskdefs.Redirector
+import org.apache.tools.ant.types.*
 import java.io.File.pathSeparator
+import java.io.File.separator
 
 class Kotlin2JvmTask : KotlinCompilerBaseTask() {
     override val compilerFqName = "org.jetbrains.kotlin.cli.jvm.K2JVMCompiler"
@@ -28,6 +31,9 @@ class Kotlin2JvmTask : KotlinCompilerBaseTask() {
 
     var noReflect: Boolean = false
 
+    private val cmdl = CommandlineJava()
+    var fork: Boolean = false
+
     private var compileClasspath: Path? = null
 
     fun setClasspath(classpath: Path) {
@@ -73,4 +79,47 @@ class Kotlin2JvmTask : KotlinCompilerBaseTask() {
         if (noReflect) args.add("-no-reflect")
         if (includeRuntime) args.add("-include-runtime")
     }
+
+    override fun execute() {
+        if (!fork)
+            super.execute()
+        else {
+            exec()
+        }
+    }
+
+    private fun exec() {
+        val javaHome = System.getProperty("java.home")
+        val javaBin = javaHome + separator + "bin" + separator + "java"
+        val redirector = Redirector(this)
+
+        fillArguments()
+
+        val command = ArrayList<String>()
+        command.add(javaBin)
+        command.addAll(cmdl.vmCommand.arguments) // jvm args
+        command.add("-Dorg.jetbrains.kotlin.cliMessageRenderer=FullPath") // same MessageRenderer as non-forking mode
+        command.add("-cp")
+        command.add(KotlinAntTaskUtil.compilerJar.canonicalPath)
+        command.add(compilerFqName)
+        command.addAll(args) // compiler args
+
+        // streamHandler: used to handle the input and output streams of the subprocess.
+        // watchdog: a watchdog for the subprocess or <code>null</code> to disable a timeout for the subprocess.
+        // TODO: support timeout for the subprocess
+        val exe = Execute(redirector.createHandler(), null)
+        exe.setAntRun(getProject())
+        exe.commandline = command.toTypedArray()
+        log("Executing command: ${command.joinToString(" ")}", LogLevel.DEBUG.level)
+        log("Compiling ${src!!.list().toList()} => [${output!!.canonicalPath}]")
+        val exitCode = exe.execute()
+        redirector.complete()
+        if (failOnError && exitCode != 0) {
+            throw BuildException("Compile failed; see the compiler error output for details.")
+        }
+    }
+
+    fun createJvmarg(): Commandline.Argument {
+        return cmdl.createVmArgument()
+    }
 }

ant/src/org/jetbrains/kotlin/ant/KotlinCompilerBaseTask.kt

@@ -80,7 +80,7 @@ abstract class KotlinCompilerBaseTask : Task() {
         fillSpecificArguments()
     }
 
-    final override fun execute() {
+    override fun execute() {
         fillArguments()
 
         val compilerClass = KotlinAntTaskUtil.getOrCreateClassLoader().loadClass(compilerFqName)