Add jvm8 target key, added jvm 8 option to bytecode tool window

IsJava8 renamed to isJvm8

compiler/backend/src/org/jetbrains/kotlin/codegen/state/GenerationState.kt

@@ -155,10 +155,11 @@ class GenerationState @JvmOverloads constructor(
     val isInlineDisabled: Boolean = configuration.getBoolean(CommonConfigurationKeys.DISABLE_INLINE)
     val useTypeTableInSerializer: Boolean = configuration.getBoolean(JVMConfigurationKeys.USE_TYPE_TABLE)
     val inheritMultifileParts: Boolean = configuration.getBoolean(JVMConfigurationKeys.INHERIT_MULTIFILE_PARTS)
+    val isJvm8Target: Boolean = configuration.getBoolean(JVMConfigurationKeys.JVM_8_TARGET)
 
     val rootContext: CodegenContext<*> = RootContext(this)
 
-    val classFileVersion: Int = Opcodes.V1_6
+    val classFileVersion: Int = if (isJvm8Target) Opcodes.V1_8 else Opcodes.V1_6
 
     init {
         this.interceptedBuilderFactory = builderFactory

compiler/frontend.java/src/org/jetbrains/kotlin/config/JVMConfigurationKeys.java

@@ -57,6 +57,9 @@ public class JVMConfigurationKeys {
     public static final CompilerConfigurationKey<Boolean> USE_TYPE_TABLE =
             CompilerConfigurationKey.create("use type table in serializer");
 
+    public static final CompilerConfigurationKey<Boolean> JVM_8_TARGET =
+            CompilerConfigurationKey.create("compile to jvm 8");
+
     public static final CompilerConfigurationKey<IncrementalCompilationComponents> INCREMENTAL_COMPILATION_COMPONENTS =
             CompilerConfigurationKey.create("incremental cache provider");
 

idea/src/org/jetbrains/kotlin/idea/internal/KotlinBytecodeToolWindow.java

@@ -127,6 +127,10 @@ public class KotlinBytecodeToolWindow extends JPanel implements Disposable {
                 configuration.put(JVMConfigurationKeys.DISABLE_OPTIMIZATION, true);
             }
 
+            if (jvm8Target.isSelected()) {
+                configuration.put(JVMConfigurationKeys.JVM_8_TARGET, true);
+            }
+
             return getBytecodeForFile(ktFile, configuration);
         }
 
@@ -175,6 +179,7 @@ public class KotlinBytecodeToolWindow extends JPanel implements Disposable {
     private final JCheckBox enableOptimization;
     private final JCheckBox enableAssertions;
     private final JButton decompile;
+    private final JCheckBox jvm8Target;
 
     public KotlinBytecodeToolWindow(Project project, ToolWindow toolWindow) {
         super(new BorderLayout());
@@ -213,9 +218,11 @@ public class KotlinBytecodeToolWindow extends JPanel implements Disposable {
         enableInline = new JCheckBox("Inline", true);
         enableOptimization = new JCheckBox("Optimization", true);
         enableAssertions = new JCheckBox("Assertions", true);
+        jvm8Target = new JCheckBox("JVM 8 target", false);
         optionPanel.add(enableInline);
         optionPanel.add(enableOptimization);
         optionPanel.add(enableAssertions);
+        optionPanel.add(jvm8Target);
 
         new InfinitePeriodicalTask(UPDATE_DELAY, Alarm.ThreadToUse.SWING_THREAD, this, new Computable<LongRunningReadTask>() {
             @Override