1 files changed, 26 insertions, 0 deletions
diff --git a/submit/ast/UnaryOperator.java b/submit/ast/UnaryOperator.java
index 1b5082a..5195ef0 100644
--- a/submit/ast/UnaryOperator.java
+++ b/submit/ast/UnaryOperator.java
@@ -4,6 +4,10 @@
  */
 package submit.ast;
 
+import submit.MIPSResult;
+import submit.RegisterAllocator;
+import submit.SymbolTable;
+
 /**
  *
  * @author edwajohn
@@ -23,5 +27,27 @@ public class UnaryOperator extends AbstractNode implements Expression {
     builder.append(type);
     expression.toCminus(builder, prefix);
   }
+  @Override
+  public MIPSResult toMIPS(StringBuilder code, StringBuilder data,
+                           SymbolTable symbolTable,
+                           RegisterAllocator regAllocator) {
+    MIPSResult result =
+        expression.toMIPS(code, data, symbolTable, regAllocator);
+
+    String reg = regAllocator.getRegisterOrLoadIntoRegister(result, code);
 
+    switch (type) {
+    case NEG:
+      code.append(String.format("sub %s $zero %s\n", reg, reg));
+      break;
+    case NOT:
+      code.append(String.format("sltu %s $zero %s\n", reg, reg))
+          .append(String.format("xori %s %s 1\n", reg, reg));
+      break;
+    default:
+      break;
+    }
+
+    return MIPSResult.createRegisterResult(reg, VarType.INT);
+  }
 }