Add byte code expression for instance of

presto-main/src/main/java/com/facebook/presto/byteCode/expression/ByteCodeExpression.java

@@ -216,4 +216,9 @@ public final <T> T accept(ByteCodeNode parent, ByteCodeVisitor<T> visitor)
     {
         return visitor.visitByteCodeExpression(parent, this);
     }
+
+    public ByteCodeExpression instanceOf(Class<?> type)
+    {
+        return InstanceOfByteCodeExpression.instanceOf(this, type);
+    }
 }

presto-main/src/main/java/com/facebook/presto/byteCode/expression/InstanceOfByteCodeExpression.java

@@ -0,0 +1,64 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.facebook.presto.byteCode.expression;
+
+import com.facebook.presto.byteCode.ByteCodeBlock;
+import com.facebook.presto.byteCode.ByteCodeNode;
+import com.facebook.presto.byteCode.MethodGenerationContext;
+import com.google.common.collect.ImmutableList;
+
+import java.util.List;
+
+import static com.facebook.presto.byteCode.ParameterizedType.type;
+import static java.util.Objects.requireNonNull;
+
+class InstanceOfByteCodeExpression
+        extends ByteCodeExpression
+{
+    private final ByteCodeExpression instance;
+    private final Class<?> type;
+
+    public InstanceOfByteCodeExpression(ByteCodeExpression instance, Class<?> type)
+    {
+        super(type(boolean.class));
+
+        this.instance = requireNonNull(instance, "instance is null");
+        this.type = requireNonNull(type, "type is null");
+    }
+
+    public static ByteCodeExpression instanceOf(ByteCodeExpression instance, Class<?> type)
+    {
+        return new InstanceOfByteCodeExpression(instance, type);
+    }
+
+    @Override
+    public ByteCodeNode getByteCode(MethodGenerationContext generationContext)
+    {
+        return new ByteCodeBlock()
+                .append(instance)
+                .isInstanceOf(type);
+    }
+
+    @Override
+    protected String formatOneLine()
+    {
+        return instance + " instanceof " + type;
+    }
+
+    @Override
+    public List<ByteCodeNode> getChildNodes()
+    {
+        return ImmutableList.of();
+    }
+}