llvmir some opt

frontend/ast/exp/RelExp.java

@@ -0,0 +1,50 @@
+package frontend.ast.exp;
+
+import frontend.ast.Node;
+import frontend.ast.NodeStack;
+import frontend.ast.SyntaxType;
+import frontend.lexer.TokenStream;
+import frontend.lexer.TokenType;
+import frontend.ast.token.TokenNode;
+import error.Errors;
+
+public class RelExp extends Node {
+    public RelExp(TokenStream ts) {
+        super(SyntaxType.REL_EXP, ts);
+    }
+
+    public void parse(Errors errors) {
+        NodeStack stack = new NodeStack();
+        while (true) {
+            AddExp addexp = new AddExp(this.ts);
+            addexp.parse(errors);
+            stack.push(addexp);
+            if (isRelOp()) {
+                stack.push(new TokenNode(ts)); // relop
+            } else {
+                break;
+            }
+        }
+        if (stack.size() == 1) {
+            this.addChild((AddExp)stack.pop());
+        } else {
+            RelExp temp = this;
+            while(stack.size() > 1) {
+                RelExp rexp = new RelExp(this.ts);
+                AddExp addexp = (AddExp)stack.pop();
+                TokenNode relop = (TokenNode)stack.pop();
+                temp.addChild(rexp);
+                temp.addChild(relop);
+                temp.addChild(addexp);
+                temp = rexp;
+            }
+            temp.addChild((AddExp)stack.pop());
+        }
+    }
+
+    public boolean isRelOp() {
+        TokenType t = getCurrToken().getType();
+        return t == TokenType.LSS || t == TokenType.GRE
+                || t == TokenType.LEQ || t == TokenType.GEQ;
+    }
+}