Respond to review feedback

substratevm/src/com.oracle.objectfile/src/com/oracle/objectfile/debugentry/ClassEntry.java

@@ -62,7 +62,7 @@ public class ClassEntry extends StructureTypeEntry {
     /**
      * Details of the associated file.
      */
-    private FileEntry fileEntry;
+    private final FileEntry fileEntry;
     /**
      * Details of the associated loader.
      */

substratevm/src/com.oracle.objectfile/src/com/oracle/objectfile/debugentry/CompiledMethodEntry.java

@@ -41,19 +41,19 @@ public class CompiledMethodEntry {
     /**
      * The primary range detailed by this object.
      */
-    private PrimaryRange primary;
+    private final PrimaryRange primary;
     /**
      * Details of the class owning this range.
      */
-    private ClassEntry classEntry;
+    private final ClassEntry classEntry;
     /**
      * Details of of compiled method frame size changes.
      */
-    private List<DebugFrameSizeChange> frameSizeInfos;
+    private final List<DebugFrameSizeChange> frameSizeInfos;
     /**
      * Size of compiled method frame.
      */
-    private int frameSize;
+    private final int frameSize;
 
     public CompiledMethodEntry(PrimaryRange primary, List<DebugFrameSizeChange> frameSizeInfos, int frameSize, ClassEntry classEntry) {
         this.primary = primary;

substratevm/src/com.oracle.objectfile/src/com/oracle/objectfile/debugentry/DebugInfoBase.java

@@ -716,17 +716,6 @@ public boolean isHubClassEntry(ClassEntry classEntry) {
         return classEntry.getTypeName().equals(DwarfDebugInfo.HUB_TYPE_NAME);
     }
 
-    public int classLayoutAbbrevCode(ClassEntry classEntry) {
-        if (!useHeapBase & isHubClassEntry(classEntry)) {
-            /*
-             * This layout adds special logic to remove tag bits from indirect pointers to this
-             * type.
-             */
-            return DwarfDebugInfo.DW_ABBREV_CODE_class_layout2;
-        }
-        return DwarfDebugInfo.DW_ABBREV_CODE_class_layout1;
-    }
-
     public ClassEntry getHubClassEntry() {
         return hubClassEntry;
     }

substratevm/src/com.oracle.objectfile/src/com/oracle/objectfile/debugentry/DirEntry.java

@@ -36,8 +36,8 @@
  * into directory tables once only rather than once per file.
  */
 public class DirEntry {
-    private Path path;
-    private int idx;
+    private final Path path;
+    private final int idx;
 
     public DirEntry(Path path, int idx) {
         this.path = path;

substratevm/src/com.oracle.objectfile/src/com/oracle/objectfile/debugentry/FileEntry.java

@@ -30,9 +30,9 @@
  * Tracks debug info associated with a Java source file.
  */
 public class FileEntry {
-    private String fileName;
-    private DirEntry dirEntry;
-    private int idx;
+    private final String fileName;
+    private final DirEntry dirEntry;
+    private final int idx;
 
     public FileEntry(String fileName, DirEntry dirEntry, int idx) {
         this.fileName = fileName;

substratevm/src/com.oracle.objectfile/src/com/oracle/objectfile/debugentry/InterfaceClassEntry.java

@@ -36,7 +36,7 @@
 import java.util.stream.Stream;
 
 public class InterfaceClassEntry extends ClassEntry {
-    private List<ClassEntry> implementors;
+    private final List<ClassEntry> implementors;
 
     public InterfaceClassEntry(String className, FileEntry fileEntry, int size) {
         super(className, fileEntry, size);

substratevm/src/com.oracle.objectfile/src/com/oracle/objectfile/debugentry/LoaderEntry.java

@@ -32,7 +32,7 @@
  * need to be embedded in debug info that identifies class and method names.
  */
 public class LoaderEntry {
-    String loaderId;
+    private final String loaderId;
 
     public LoaderEntry(String id) {
         loaderId = id;

substratevm/src/com.oracle.objectfile/src/com/oracle/objectfile/debugentry/MemberEntry.java

@@ -32,7 +32,7 @@
  */
 public abstract class MemberEntry {
     protected FileEntry fileEntry;
-    protected int line;
+    protected final int line;
     protected final String memberName;
     protected final StructureTypeEntry ownerType;
     protected final TypeEntry valueType;

substratevm/src/com.oracle.objectfile/src/com/oracle/objectfile/debugentry/MethodEntry.java

@@ -51,9 +51,9 @@ public class MethodEntry extends MemberEntry {
     static final int INLINED = 1 << 2;
     static final int IS_OVERRIDE = 1 << 3;
     static final int IS_CONSTRUCTOR = 1 << 4;
-    int flags;
-    int vtableOffset = -1;
-    final String symbolName;
+    private int flags;
+    private final int vtableOffset;
+    private final String symbolName;
 
     public MethodEntry(DebugInfoBase debugInfoBase, DebugMethodInfo debugMethodInfo,
                     FileEntry fileEntry, int line, String methodName, ClassEntry ownerType,

substratevm/src/com.oracle.objectfile/src/com/oracle/objectfile/debugentry/PrimitiveTypeEntry.java

@@ -36,9 +36,9 @@
 import static com.oracle.objectfile.debuginfo.DebugInfoProvider.DebugPrimitiveTypeInfo.FLAG_SIGNED;
 
 public class PrimitiveTypeEntry extends TypeEntry {
-    char typeChar;
-    int flags;
-    int bitCount;
+    private char typeChar;
+    private int flags;
+    private int bitCount;
 
     public PrimitiveTypeEntry(String typeName, int size) {
         super(typeName, size);

substratevm/src/com.oracle.objectfile/src/com/oracle/objectfile/debugentry/StringEntry.java

@@ -31,7 +31,7 @@
  * be located in the debug_string section and, if so, tracks the offset at which it gets written.
  */
 public class StringEntry {
-    private String string;
+    private final String string;
     private int offset;
     private boolean addToStrSection;
 

substratevm/src/com.oracle.objectfile/src/com/oracle/objectfile/debugentry/StructureTypeEntry.java

@@ -43,7 +43,7 @@ public abstract class StructureTypeEntry extends TypeEntry {
     /**
      * Details of fields located in this instance.
      */
-    protected List<FieldEntry> fields;
+    protected final List<FieldEntry> fields;
 
     public StructureTypeEntry(String typeName, int size) {
         super(typeName, size);

substratevm/src/com.oracle.objectfile/src/com/oracle/objectfile/debugentry/TypeEntry.java

@@ -41,7 +41,7 @@ public abstract class TypeEntry {
     /**
      * The name of this type.
      */
-    protected String typeName;
+    protected final String typeName;
 
     /**
      * The offset of the java.lang.Class instance for this class in the image heap or -1 if no such
@@ -52,7 +52,7 @@ public abstract class TypeEntry {
     /**
      * The size of an occurrence of this type in bytes.
      */
-    protected int size;
+    protected final int size;
 
     protected TypeEntry(String typeName, int size) {
         this.typeName = typeName;

substratevm/src/com.oracle.objectfile/src/com/oracle/objectfile/elf/dwarf/DwarfDebugInfo.java

@@ -310,22 +310,22 @@ public class DwarfDebugInfo extends DebugInfoBase {
      */
     public static final String HUB_TYPE_NAME = "java.lang.Class";
 
-    private DwarfStrSectionImpl dwarfStrSection;
-    private DwarfAbbrevSectionImpl dwarfAbbrevSection;
-    private DwarfInfoSectionImpl dwarfInfoSection;
-    private DwarfLocSectionImpl dwarfLocSection;
-    private DwarfARangesSectionImpl dwarfARangesSection;
-    private DwarfLineSectionImpl dwarfLineSection;
-    private DwarfFrameSectionImpl dwarfFameSection;
+    private final DwarfStrSectionImpl dwarfStrSection;
+    private final DwarfAbbrevSectionImpl dwarfAbbrevSection;
+    private final DwarfInfoSectionImpl dwarfInfoSection;
+    private final DwarfLocSectionImpl dwarfLocSection;
+    private final DwarfARangesSectionImpl dwarfARangesSection;
+    private final DwarfLineSectionImpl dwarfLineSection;
+    private final DwarfFrameSectionImpl dwarfFameSection;
     public final ELFMachine elfMachine;
     /**
      * Register used to hold the heap base.
      */
-    private byte heapbaseRegister;
+    private final byte heapbaseRegister;
     /**
      * Register used to hold the current thread.
      */
-    private byte threadRegister;
+    private final byte threadRegister;
 
     /**
      * A collection of properties associated with each generated type record indexed by type name.

substratevm/src/com.oracle.objectfile/src/com/oracle/objectfile/elf/dwarf/DwarfInfoSectionImpl.java

@@ -63,7 +63,7 @@ public class DwarfInfoSectionImpl extends DwarfSectionImpl {
     /**
      * The name of a special DWARF struct type used to model an object header.
      */
-    public static final String OBJECT_HEADER_STRUCT_NAME = "_objhdr";
+    private static final String OBJECT_HEADER_STRUCT_NAME = "_objhdr";
 
     /**
      * An info header section always contains a fixed number of bytes.

substratevm/src/com.oracle.objectfile/src/com/oracle/objectfile/elf/dwarf/DwarfSectionImpl.java

@@ -63,7 +63,7 @@
 public abstract class DwarfSectionImpl extends BasicProgbitsSectionImpl {
     // auxiliary class used to track byte array positions
     protected class Cursor {
-        int pos;
+        private int pos;
 
         public Cursor() {
             this(0);
@@ -90,7 +90,7 @@ public int get() {
         }
     }
 
-    protected DwarfDebugInfo dwarfSections;
+    protected final DwarfDebugInfo dwarfSections;
     protected boolean debug = false;
     protected long debugTextBase = 0;
     protected long debugAddress = 0;