llvmir some opt

frontend/ast/exp/ConstExp.java

@@ -0,0 +1,22 @@
+package frontend.ast.exp;
+
+import error.Errors;
+import frontend.ast.Node;
+import frontend.ast.SyntaxType;
+import frontend.lexer.TokenStream;
+
+public class ConstExp extends Node {
+    public ConstExp(TokenStream ts) {
+        super(SyntaxType.CONST_EXP, ts);
+    }
+
+    public void parse(Errors errors) {
+        AddExp ade = new AddExp(ts);
+        ade.parse(errors);
+        addChild(ade);
+    }
+
+    public int getValue() {
+        return ((AddExp) getChild(0)).getValue();
+    }
+}