I added some code to help with constants but it's not working.

src/intermediate_code.c

@@ -23,20 +23,20 @@ void emit_helper(void){
         }
 }
 
- void emit_binary_op(char* result, Op op, char* arg1, char* arg2){
+ void emit_binary_op(TableNode * result, Op op, TableNode * arg1, TableNode * arg2){
         emit_helper();
         current->opcode = op;
-        current->result = look_up(cur, result);
-        current->operand1 = look_up(cur, arg1);
-        current->operand2 = look_up(cur, arg2);
+        current->result = result;
+        current->operand1 = arg1;
+        current->operand2 = arg2;
         return;
  }
 
- void emit_unary_op(char* result, Op op, char* arg){
+ void emit_unary_op(TableNode * result, Op op, TableNode * arg){
         emit_helper();
         current->opcode = op;
-        current->result = look_up(cur, result);
-        current->operand1 = look_up(cur, arg);
+        current->result = result;
+        current->operand1 = arg;
         return;
  }
 

src/intermediate_code.h

@@ -35,6 +35,30 @@ typedef enum {
 
 
 } Op;
+
+typedef enum {
+        NODE,
+        INTEGER,
+        STRING,
+        CHARACTER,
+        ADDRESS,
+        BOOLEAN
+} Discriminant;
+
+typedef union {
+        TableNode *     node;
+        int             integer;
+        char *          string;
+        char            character;
+        void *          address;
+        bool            Boolean;
+} Register_union;
+
+typedef struct {
+        Discriminant d;
+        Register_union r_union;
+} TNodeOrConst;
+
 typedef struct Instruction {
         Op opcode;
         TableNode * result;