Fixed IndexExpr

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

@@ -547,8 +547,12 @@ public class CodeGenImpl extends CodeGenBase
                     }
                     else
                     {
+                        backend.emitSW(reg, Register.FP, -sp_off*wordSize, "Store value to b stored");
+                        incSp(1);
                         Register ret = target.dispatch(this);
-                        backend.emitSW(T1, ret, 0, "Set list element"); 
+                        sp_off--;
+                        backend.emitLW(reg, Register.FP, -sp_off*wordSize, "Load value to b stored");
+                        backend.emitSW(reg, ret, 0, "Set list element"); 
                     }
                 }
             //}
@@ -1139,8 +1143,9 @@ public class CodeGenImpl extends CodeGenBase
                 backend.emitADDI(index, index, 4, "Compute list element offset in words");
                 backend.emitLI(temp, wordSize, "Word size in bytes");
                 backend.emitMUL(index, index, temp, "Compute list element offset in bytes");
-                backend.emitADD(index, vacantReg, index, "Pointer to list element");
+                backend.emitADD(vacantReg, vacantReg, index, "Pointer to list element");
-                backend.emitLW(Register.A0, index, 0, "Set list element");
+                backend.emitMV(temp,vacantReg,"Copy Result");
+                backend.emitLW(A0, vacantReg, 0, "Load list element"); 
             } 
             else 
             {
@@ -1165,10 +1170,11 @@ public class CodeGenImpl extends CodeGenBase
                 backend.emitLI(T1, 1, "str size");
                 backend.emitSW(T1, vacantReg, 3*wordSize, "len");
                 backend.emitSW(T0, vacantReg, 4*wordSize, "ch");  
+                backend.emitMV(temp,vacantReg,"Copy Result");
             }
             freeRegister(tmpHandle);
             -- sp_off;
-            return vacantReg;
+            return temp;
         }
   
         public Register analyze(MemberExpr node)