[GR-26397] Use Shape flags for frozen

PullRequest: truffleruby/3172

Author: bjfish

src/main/java/org/truffleruby/Layouts.java

@@ -21,7 +21,6 @@ public abstract class Layouts {
     // Standard identifiers
 
     public static final HiddenKey OBJECT_ID_IDENTIFIER = new HiddenKey("object_id"); // long
-    public static final HiddenKey FROZEN_IDENTIFIER = new HiddenKey("frozen?"); // boolean
     public static final HiddenKey OBJECT_LOCK = new HiddenKey("object_lock"); // ReentrantLock
     public static final HiddenKey ASSOCIATED_IDENTIFIER = new HiddenKey("associated"); // Pointer[]
     public static final HiddenKey FINALIZER_REF_IDENTIFIER = new HiddenKey("finalizerRef"); // FinalizerReference

src/main/java/org/truffleruby/language/RubyDynamicObject.java

@@ -11,7 +11,6 @@
 
 import com.oracle.truffle.api.interop.StopIterationException;
 import com.oracle.truffle.api.interop.UnknownKeyException;
-import org.truffleruby.Layouts;
 import org.truffleruby.RubyContext;
 import org.truffleruby.RubyLanguage;
 import org.truffleruby.core.array.ArrayUtils;
@@ -62,6 +61,8 @@
 @ExportLibrary(InteropLibrary.class)
 public abstract class RubyDynamicObject extends DynamicObject {
 
+    private static final int FROZEN = 1;
+
     private RubyClass metaClass;
 
     public RubyDynamicObject(RubyClass metaClass, Shape shape) {
@@ -98,14 +99,14 @@ public String toString() {
     // region RubyLibrary messages
     @ExportMessage
     public void freeze(
-            @Exclusive @Cached WriteObjectFieldNode writeFrozenNode) {
-        writeFrozenNode.execute(this, Layouts.FROZEN_IDENTIFIER, true);
+            @CachedLibrary("this") DynamicObjectLibrary objLib) {
+        objLib.setShapeFlags(this, objLib.getShapeFlags(this) | FROZEN);
     }
 
     @ExportMessage
     public boolean isFrozen(
-            @CachedLibrary("this") DynamicObjectLibrary readFrozenNode) {
-        return (boolean) readFrozenNode.getOrDefault(this, Layouts.FROZEN_IDENTIFIER, false);
+            @CachedLibrary("this") DynamicObjectLibrary objLib) {
+        return (objLib.getShapeFlags(this) & FROZEN) != 0;
     }
     // endregion