tools: Add dependecy download helpers

This patch adds 2 helpers to download dependencies for compiler and
stub generator during their execution.

They take list of external dependencies as a parameter and directory
where they must be located. Helpers check if these dependencies exist
in the given directory and download not existing ones.

backend.native/cli.bc/src/org/jetbrains/kotlin/cli/bc/K2Native.kt

@@ -16,17 +16,15 @@ import kotlin.reflect.KFunction
 
 private fun maybeExecuteHelper(configuration: CompilerConfiguration) {
     try {
-        val kClass = Class.forName("org.jetbrains.kotlin.konan.Helper0").kotlin
+        val kClass = Class.forName("org.jetbrains.kotlin.konan.CompilerHelper0").kotlin
         val ctor = kClass.constructors.single() as KFunction<Runnable>
         val distribution = Distribution(configuration)
-        val target = TargetManager(configuration)
-        val result = ctor.call(
-                distribution.konanHome, TargetManager.host, target.current)
+        val result = ctor.call(distribution)
         result.run()
     } catch (notFound: ClassNotFoundException) {
         // Just ignore, no helper.
     } catch (e: Throwable) {
-        println(e.toString())
+        throw IllegalStateException("Cannot download dependencies.", e)
     }
 }
 

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

@@ -35,7 +35,13 @@ class Distribution(val config: CompilerConfiguration) {
 
     val llvmHome = "$dependencies/${properties.propertyString("llvmHome.$suffix")}" 
     val sysRoot = "$dependencies/${properties.propertyString("sysRoot.$suffix")}"
-    val libGcc = "$dependencies/${properties.propertyString("libGcc.$suffix")}" 
+    val libGcc = "$dependencies/${properties.propertyString("libGcc.$suffix")}"
+
+    val targetSysRoot = if (properties.hasProperty("targetSysRoot.$suffix")) {
+            "$dependencies/${properties.propertyString("targetSysRoot.$suffix")}"
+        } else {
+            sysRoot
+        }
 
     val llvmBin = "$llvmHome/bin"
     val llvmLib = "$llvmHome/lib"

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/Helper0.kt

@@ -4,12 +4,24 @@
 //
 package org.jetbrains.kotlin.konan
 
-import org.jetbrains.kotlin.backend.konan.KonanTarget
+import org.jetbrains.kotlin.backend.konan.Distribution
+import org.jetbrains.kotlin.backend.konan.TargetManager
 
-// Name it Helper0 so that it get loaded.
-class Helper0Disabled(
-        val konanHome: String, val host: KonanTarget, val target: KonanTarget) : Runnable {
+// Name it CompilerHelper0 so that it get loaded.
+class CompilerHelper0Disabled(val distribution: Distribution) : Runnable {
     override fun run() {
-        println("Running helper with $konanHome $host $target")
+        println("Running helper with ${distribution.konanHome} ${distribution.target} ${TargetManager.host}")
+    }
+}
+
+//
+// Example startup helper for Kotlin N stub generator. Compile to JAR and add it to
+// Kotlin N classpath - it will get loaded and executed automatically.
+//
+
+// Name it InteropHelper0 so that it get loaded.
+class InteropHelper0Disabled(val dependenciesRoot: String, val dependencies: List<String>) : Runnable {
+    override fun run() {
+        println("Running helper with $dependenciesRoot $dependencies")
     }
 }

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

@@ -15,10 +15,13 @@ public class KonanProperties(val propertyFile: String) {
     }
 
     fun propertyString(key: String): String? = properties.getProperty(key)
+    fun propertyString(key: String, default: String) : String = properties.getProperty(key, default)
 
     fun propertyList(key: String): List<String> {
         val value =  properties.getProperty(key)
         return value?.split(' ') ?: listOf<String>()
     }
+
+    fun hasProperty(key: String): Boolean = properties.getProperty(key) != null
 }
 

backend.native/konan.properties

@@ -1,6 +1,7 @@
 
 // TODO: Do we need a $variable substitution mechanism here?
 llvmVersion = 3.9.0
+dependenciesUrl = https://jetbrains.bintray.com/kotlin-native-dependencies
 
 // macbook
 arch.osx = x86_64

backend.native/tests/build.gradle

@@ -25,8 +25,8 @@ dependencies {
     }
 }
 
-def testOutputRoot = rootProject.file("test.output").absolutePath
-def externalTestsDir = project.file("external")
+ext.testOutputRoot = rootProject.file("test.output").absolutePath
+ext.externalTestsDir = project.file("external")
 externalTestsDir.mkdirs()
 
 allprojects {