8270949: Make dynamically generated classes with the class file version of the current release

Reviewed-by: alanb

src/java.base/share/classes/java/lang/invoke/ClassSpecializer.java

@@ -621,7 +621,7 @@ abstract class ClassSpecializer<T,K,S extends ClassSpecializer<T,K,S>.SpeciesDat
 
             final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES);
             final int NOT_ACC_PUBLIC = 0;  // not ACC_PUBLIC
-            cw.visit(V1_6, NOT_ACC_PUBLIC + ACC_FINAL + ACC_SUPER, className, null, superClassName, null);
+            cw.visit(CLASSFILE_VERSION, NOT_ACC_PUBLIC + ACC_FINAL + ACC_SUPER, className, null, superClassName, null);
 
             final String sourceFile = className.substring(className.lastIndexOf('.')+1);
             cw.visitSource(sourceFile, null);

src/java.base/share/classes/java/lang/invoke/GenerateJLIClassesHelper.java

@@ -39,6 +39,7 @@ import java.util.TreeSet;
 import java.util.stream.Stream;
 
 import static java.lang.invoke.LambdaForm.BasicType.*;
+import static java.lang.invoke.MethodHandleStatics.CLASSFILE_VERSION;
 import static java.lang.invoke.MethodTypeForm.*;
 import static java.lang.invoke.LambdaForm.Kind.*;
 
@@ -504,7 +505,7 @@ class GenerateJLIClassesHelper {
      */
     private static byte[] generateCodeBytesForLFs(String className, String[] names, LambdaForm[] forms) {
         ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES);
-        cw.visit(Opcodes.V1_8, Opcodes.ACC_PRIVATE + Opcodes.ACC_FINAL + Opcodes.ACC_SUPER,
+        cw.visit(CLASSFILE_VERSION, Opcodes.ACC_PRIVATE + Opcodes.ACC_FINAL + Opcodes.ACC_SUPER,
                 className, null, InvokerBytecodeGenerator.INVOKER_SUPER_NAME, null);
         cw.visitSource(className.substring(className.lastIndexOf('/') + 1), null);
 

src/java.base/share/classes/java/lang/invoke/InnerClassLambdaMetafactory.java

@@ -26,6 +26,7 @@
 package java.lang.invoke;
 
 import jdk.internal.misc.CDS;
+import jdk.internal.misc.VM;
 import jdk.internal.org.objectweb.asm.*;
 import sun.invoke.util.BytecodeDescriptor;
 import sun.invoke.util.VerifyAccess;
@@ -56,7 +57,7 @@ import static jdk.internal.org.objectweb.asm.Opcodes.*;
  * @see LambdaMetafactory
  */
 /* package */ final class InnerClassLambdaMetafactory extends AbstractValidatingLambdaMetafactory {
-    private static final int CLASSFILE_VERSION = 59;
+    private static final int CLASSFILE_VERSION = VM.classFileVersion();
     private static final String METHOD_DESCRIPTOR_VOID = Type.getMethodDescriptor(Type.VOID_TYPE);
     private static final String JAVA_LANG_OBJECT = "java/lang/Object";
     private static final String NAME_CTOR = "<init>";

src/java.base/share/classes/java/lang/invoke/InvokerBytecodeGenerator.java

@@ -340,7 +340,7 @@ class InvokerBytecodeGenerator {
         final int NOT_ACC_PUBLIC = 0;  // not ACC_PUBLIC
         ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES);
         setClassWriter(cw);
-        cw.visit(Opcodes.V1_8, NOT_ACC_PUBLIC + Opcodes.ACC_FINAL + Opcodes.ACC_SUPER,
+        cw.visit(CLASSFILE_VERSION, NOT_ACC_PUBLIC + Opcodes.ACC_FINAL + Opcodes.ACC_SUPER,
                 className, null, INVOKER_SUPER_NAME, null);
         cw.visitSource(SOURCE_PREFIX + name, null);
         return cw;

src/java.base/share/classes/java/lang/invoke/MethodHandleImpl.java

@@ -1156,7 +1156,7 @@ abstract class MethodHandleImpl {
             //        return vamh.invokeExact(args);
             //     }
             // }
-            cw.visit(52, ACC_PRIVATE | ACC_SUPER, "InjectedInvoker", null, "java/lang/Object", null);
+            cw.visit(CLASSFILE_VERSION, ACC_PRIVATE | ACC_SUPER, "InjectedInvoker", null, "java/lang/Object", null);
 
             MethodVisitor mv = cw.visitMethod(ACC_STATIC, "invoke_V",
                           "(Ljava/lang/invoke/MethodHandle;[Ljava/lang/Object;)Ljava/lang/Object;",

src/java.base/share/classes/java/lang/invoke/MethodHandleStatics.java

@@ -27,6 +27,7 @@ package java.lang.invoke;
 
 import jdk.internal.misc.CDS;
 import jdk.internal.misc.Unsafe;
+import jdk.internal.misc.VM;
 import sun.security.action.GetPropertyAction;
 
 import java.util.Properties;
@@ -46,6 +47,7 @@ class MethodHandleStatics {
     private MethodHandleStatics() { }  // do not instantiate
 
     static final Unsafe UNSAFE = Unsafe.getUnsafe();
+    static final int CLASSFILE_VERSION = VM.classFileVersion();
 
     static final boolean DEBUG_METHOD_HANDLE_NAMES;
     static final boolean DUMP_CLASS_FILES;

src/java.base/share/classes/java/lang/reflect/ProxyGenerator.java

@@ -25,6 +25,7 @@
 
 package java.lang.reflect;
 
+import jdk.internal.misc.VM;
 import jdk.internal.org.objectweb.asm.ClassWriter;
 import jdk.internal.org.objectweb.asm.Label;
 import jdk.internal.org.objectweb.asm.MethodVisitor;
@@ -55,7 +56,7 @@ import static jdk.internal.org.objectweb.asm.Opcodes.*;
  * "generateProxyClass" method.
  */
 final class ProxyGenerator extends ClassWriter {
-
+    private static final int CLASSFILE_VERSION = VM.classFileVersion();
     private static final String JL_CLASS = "java/lang/Class";
     private static final String JL_OBJECT = "java/lang/Object";
     private static final String JL_THROWABLE = "java/lang/Throwable";
@@ -455,7 +456,7 @@ final class ProxyGenerator extends ClassWriter {
      * class file generation process.
      */
     private byte[] generateClassFile() {
-        visit(V14, accessFlags, dotToSlash(className), null,
+        visit(CLASSFILE_VERSION, accessFlags, dotToSlash(className), null,
                 JLR_PROXY, typeNames(interfaces));
 
         /*

src/java.base/share/classes/jdk/internal/misc/VM.java

@@ -151,6 +151,14 @@ public class VM {
     private static int classFileMinorVersion;
     private static final int PREVIEW_MINOR_VERSION = 65535;
 
+    /**
+     * Returns the class file version of the current release.
+     * @jvms 4.1 Table 4.1-A. class file format major versions
+     */
+    public static int classFileVersion() {
+        return classFileMajorVersion;
+    }
+
     /**
      * Tests if the given version is a supported {@code class}
      * file version.