8330182: Start of release updates for JDK 24

8330183: Add SourceVersion.RELEASE_24
8330184: Add source 24 and target 24 to javac

Reviewed-by: iris, vromero, asotona, dholmes

src/java.base/share/classes/java/lang/classfile/ClassFile.java

@@ -1481,6 +1481,12 @@ public sealed interface ClassFile
      */
     int JAVA_23_VERSION = 67;
 
+    /**
+     * The class major version of JAVA_24.
+     * @since 24
+     */
+    int JAVA_24_VERSION = 68;
+
     /**
      * A minor version number indicating a class uses preview features
      * of a Java SE version since 12, for major versions {@value
@@ -1492,7 +1498,7 @@ public sealed interface ClassFile
      * {@return the latest major Java version}
      */
     static int latestMajorVersion() {
-        return JAVA_23_VERSION;
+        return JAVA_24_VERSION;
     }
 
     /**

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

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2022, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2022, 2024, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -306,6 +306,18 @@ public enum ClassFileFormatVersion {
      * <cite>The Java Virtual Machine Specification, Java SE 23 Edition</cite></a>
      */
     RELEASE_23(67),
+
+    /**
+     * The version introduced by the Java Platform, Standard Edition
+     * 24.
+     *
+     * @since 24
+     *
+     * @see <a
+     * href="https://docs.oracle.com/javase/specs/jvms/se24/html/index.html">
+     * <cite>The Java Virtual Machine Specification, Java SE 24 Edition</cite></a>
+     */
+    RELEASE_24(68),
     ; // Reduce code churn when appending new constants
 
     // Note to maintainers: when adding constants for newer releases,
@@ -321,7 +333,7 @@ public enum ClassFileFormatVersion {
      * {@return the latest class file format version}
      */
     public static ClassFileFormatVersion latest() {
-        return RELEASE_23;
+        return RELEASE_24;
     }
 
     /**

src/java.base/share/classes/jdk/internal/org/objectweb/asm/ClassReader.java

@@ -227,7 +227,7 @@ public class ClassReader {
         this.b = classFileBuffer;
         // Check the class' major_version. This field is after the magic and minor_version fields, which
         // use 4 and 2 bytes respectively.
-        if (checkClassVersion && readShort(classFileOffset + 6) > Opcodes.V23) {
+        if (checkClassVersion && readShort(classFileOffset + 6) > Opcodes.V24) {
             throw new IllegalArgumentException(
                     "Unsupported class file major version " + readShort(classFileOffset + 6));
         }

src/java.base/share/classes/jdk/internal/org/objectweb/asm/Opcodes.java

@@ -313,6 +313,7 @@ public interface Opcodes {
     int V21 = 0 << 16 | 65;
     int V22 = 0 << 16 | 66;
     int V23 = 0 << 16 | 67;
+    int V24 = 0 << 16 | 68;
 
     /**
       * Version flag indicating that the class is using 'preview' features.