Code model attribute hard-coded

src/jdk.incubator.code/share/classes/jdk/incubator/code/internal/CodeModelAttribute.java

@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.incubator.code.internal;
+
+import java.lang.classfile.AttributeMapper;
+import java.lang.classfile.AttributedElement;
+import java.lang.classfile.BufWriter;
+import java.lang.classfile.ClassReader;
+import java.lang.classfile.CustomAttribute;
+import jdk.incubator.code.Op;
+
+public class CodeModelAttribute extends CustomAttribute<CodeModelAttribute>{
+
+    enum Tag {
+        LocationAttr,
+
+        // CoreOp
+        AddOp, AndOp, ArrayLoadOp, ArrayStoreOp, ArrayLengthOp, AshrOp, AssertOp, BranchOp, CastOp, ClosureCallOp,
+        ClosureOp, ComplOp, ConcatOp, ConditionalBranchOp, ConstantOp, ConvOp, DivOp, EqOp, ExceptionRegionEnter,
+        ExceptionRegionExit, FieldLoadOp, FieldStoreOp, FuncCallOp, FuncOp, GeOp, GtOp, InstanceOfOp, InvokeOp,
+        LambdaOp, LeOp, LshlOp, LshrOp, LtOp, ModOp, ModuleOp, MonitorEnterOp, MonitorExitOp, MulOp, NegOp, NeqOp,
+        NewOp, NotOp, OrOp, QuotedOp, ReturnOp, SubOp, ThrowOp, TupleLoadOp, TupleOp, TupleWithOp, UnreachableOp,
+        VarLoadOp, VarStoreOp, VarOp, XorOp, YieldOp,
+
+        // ExtendedOp
+        JavaBlockOp, JavaBreakOp, JavaConditionalAndOp, JavaConditionalExpressionOp, JavaConditionalOrOp,
+        JavaContinueOp, JavaDoWhileOp, JavaEnhancedForOp, JavaForOp, JavaIfOp, JavaLabeledOp, JavaSwitchExpressionOp,
+        JavaSwitchFallthroughOp, JavaSwitchStatementOp, JavaSynchronizedOp, JavaTryOp, JavaYieldOp, JavaWhileOp,
+        MatchAllPatternOp, MatchOp, RecordPatternOp, TypePatternOp;
+    }
+
+    public static final String NAME = "CodeModel";
+
+    public static final AttributeMapper<CodeModelAttribute> MAPPER = new AttributeMapper<>() {
+
+        @Override
+        public String name() {
+            return NAME;
+        }
+
+        @Override
+        public CodeModelAttribute readAttribute(AttributedElement enclosing, ClassReader cr, int pos) {
+            return new CodeModelAttribute(new OpReader(cr, pos).readOp(null, null));
+        }
+
+        @Override
+        public void writeAttribute(BufWriter buf, CodeModelAttribute attr) {
+            buf.writeIndex(buf.constantPool().utf8Entry(NAME));
+            int lengthIndex = buf.size();
+            buf.writeInt(0);
+            new OpWriter(buf).writeOp(attr.op);
+            int written = buf.size() - lengthIndex - 4;
+            buf.patchInt(lengthIndex, 4, written);
+        }
+
+        @Override
+        public AttributeMapper.AttributeStability stability() {
+            return AttributeMapper.AttributeStability.CP_REFS;
+        }
+    };
+
+    public static CodeModelAttribute of(Op op) {
+        return new CodeModelAttribute(op);
+    }
+
+    private final Op op;
+
+    private CodeModelAttribute(Op op) {
+        super(MAPPER);
+        this.op = op;
+    }
+
+    public Op op() {
+        return op;
+    }
+}