Analyze Binary expression

src/main/java/chocopy/pa3/CodeGenImpl.java

@@ -162,7 +162,7 @@ public class CodeGenImpl extends CodeGenBase {
         protected Label elseBlock;
         // Variable to store offset from frame pointer to identify next 
         // empty space on stack frame to store variable
-        private final int offset = 12;
+        private int offset = 3;
         /**
          * An analyzer for the function described by FUNCINFO0, which is null for the
          * top level.
@@ -272,7 +272,45 @@ public class CodeGenImpl extends CodeGenBase {
          }
          @Override
         public Void analyze(BinaryExpr node) {
+            node.left.dispatch(this);
+            backend.emitSW(Register.A0, Register.FP, offset*4, "Push on stack slot "+offset);
+            offset++;
+            node.right.dispatch(this);
+            offset--;
+            backend.emitLW(Register.T0, Register.FP, (offset)*4, "Pop stack slot "+offset);
+            if(node.operator.equals("+"))
+                backend.emitADD(Register.A0, Register.A0, Register.T0, "Add operation");
+            else if(node.operator.equals("-"))
+                backend.emitSUB(Register.A0, Register.A0, Register.T0, "Sub operation");
+            else if(node.operator.equals("*"))
+                backend.emitMUL(Register.A0, Register.A0, Register.T0, "Mul operation");
+            else if(node.operator.equals("/"))
+                backend.emitDIV(Register.A0, Register.A0, Register.T0, "Div operation");
+            else
+            {    
                 elseBlock = generateLocalLabel();
+                String comment="Branch on not "+node.operator;
+                if(node.operator.equals("=="))
+                    backend.emitBNE(Register.A0, Register.T0,elseBlock, comment);
+                else if(node.operator.equals("!="))
+                    backend.emitBEQ(Register.A0, Register.T0,elseBlock, comment);
+                else if(node.operator.equals("<"))
+                    backend.emitBGE(Register.A0, Register.T0,elseBlock, comment);
+                else if(node.operator.equals(">"))
+                {    
+                    backend.emitBLT(Register.A0, Register.T0,elseBlock, comment);
+                    backend.emitBEQ(Register.A0, Register.T0,elseBlock, comment);
+                }
+                else if(node.operator.equals(">="))
+                    backend.emitBLT(Register.A0, Register.T0,elseBlock, comment);
+                else if(node.operator.equals("<="))
+                {    
+                    Label temp = generateLocalLabel(); 
+                    backend.emitBEQ(Register.A0, Register.T0,temp, "Branch on "+node.operator);
+                    backend.emitBGE(Register.A0, Register.T0,elseBlock, comment);
+                    backend.emitLocalLabel(temp, "True part of if check");
+                }        
+            }
             return null;
          }