Merge branch 'master' of https://github.com/yugeshk/CS335

Author: DeepankurK

src/3ac.cpp

@@ -494,7 +494,6 @@ void arithmetic_optimise(Quad* q){
 		else if(oper=="/"){
 
 			if(y==0){
-				error_msg("Division by zero not possible",line_num);
 				return;
 			}
 			else{

src/expression.cpp

@@ -249,16 +249,17 @@ Expression *create_postfix_expr_voidfun( Identifier *fi ) {
 Expression *create_postfix_expr_fun( Identifier *fi, ArgumentExprList *ae ) {
     PostfixExpression *P = new PostfixExpression();
 
-    if ( fi->value == "printf" || fi->value == "scanf" ) {
-	// XXX:
-        /* Hack : To support printf for now */
-        P->type = Type( INT_T, 0, true );
-        P->add_children( fi, ae );
-        P->res = new_temp();
-        create_new_call( P->res, fi->value );
-//        emit( P->res, "call", new_3id( fi->value ), new_3const( 0, INT3 ) );
-        return P;
-    }
+//     if ( fi->value == "printf" || fi->value == "scanf" ) {
+//         error_msg("Use functions in lib/lib.asm",line_num)
+//     // XXX:
+//         /* Hack : To support printf for now */
+//         // P->type = Type( INT_T, 0, true );
+//         // P->add_children( fi, ae );
+//         // P->res = new_temp();
+//         // create_new_call( P->res, fi->value );
+// //        emit( P->res, "call", new_3id( fi->value ), new_3const( 0, INT3 ) );
+//         return P;
+//     }
 
     SymTabEntry *ste = global_symbol_table.get_symbol_from_table( fi->value );
     if ( ste == nullptr ) {

tests/3ac_3.c

@@ -0,0 +1,26 @@
+void print_int(int c);
+void print_char(char c);
+int scan_int();
+void print_string(char *);
+int main(){
+    int a,b,c;
+    a = 14*3+5+(4+(8*12/73))-23*76+48;
+    print_int(a);
+
+    // multiply and divide by power of 2 is shift
+    b = a*2;
+    b= a/16;
+
+    b=a*0;
+    b=a+0;
+
+    while(1){
+        print_string("Inside while\n");
+        b++;
+        if(b==7){
+            break;
+        }
+    }
+
+    return 0;
+}

tests/optimisations.c

@@ -0,0 +1,25 @@
+/// switch
+void print_int(int);
+void print_char(char );
+void print_string(char *);
+int scan_int();
+int main()
+{
+   char y;
+   char arr[10];
+   int x;
+   print_string("Enter the integer for switch case\n");
+   x=scan_int();
+   y = 'a'; 
+
+    switch(x)
+    {
+       case 'a': x++;
+                break;
+       case 'b' :x+=2;
+                break; 
+    }
+    print_int(x);
+    return 0;
+
+}