8294960: Convert java.base/java.lang.invoke package to use the Classfile API to generate lambdas and method handles

Co-authored-by: Claes Redestad <redestad@openjdk.org>
Reviewed-by: redestad, liach

Author: asotona

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

@@ -25,10 +25,11 @@
 
 package java.lang.invoke;
 
-import jdk.internal.org.objectweb.asm.ClassWriter;
-import jdk.internal.org.objectweb.asm.Opcodes;
 import sun.invoke.util.Wrapper;
 
+import java.lang.classfile.ClassFile;
+import java.lang.classfile.attribute.SourceFileAttribute;
+import java.lang.constant.ClassDesc;
 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.Map;
@@ -38,10 +39,10 @@
 import java.util.TreeSet;
 import java.util.stream.Stream;
 
+import static java.lang.classfile.ClassFile.*;
 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.*;
+import static java.lang.invoke.MethodTypeForm.*;
 
 /**
  * Helper class to assist the GenerateJLIClassesPlugin to get access to
@@ -557,19 +558,14 @@ static byte[] generateInvokersHolderClassBytes(String className,
      * a class with a specified name.
      */
     private static byte[] generateCodeBytesForLFs(String className, String[] names, LambdaForm[] forms) {
-        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES);
-        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);
-
-        for (int i = 0; i < forms.length; i++) {
-            InvokerBytecodeGenerator g
-                = new InvokerBytecodeGenerator(className, names[i], forms[i], forms[i].methodType());
-            g.setClassWriter(cw);
-            g.addMethod();
-        }
-
-        return cw.toByteArray();
+        return ClassFile.of().build(ClassDesc.ofInternalName(className), clb -> {
+            clb.withFlags(ACC_PRIVATE | ACC_FINAL | ACC_SUPER)
+               .withSuperclass(InvokerBytecodeGenerator.INVOKER_SUPER_DESC)
+               .with(SourceFileAttribute.of(className.substring(className.lastIndexOf('/') + 1)));
+            for (int i = 0; i < forms.length; i++) {
+                new InvokerBytecodeGenerator(className, names[i], forms[i], forms[i].methodType()).addMethod(clb);
+            }
+        });
     }
 
     private static LambdaForm makeReinvokerFor(MethodType type) {