Hi everybody,
Why assignements in Vala make C code with multiples temporary variables ?
It's not very good for the performances...
I read codegen/valaccodeassignmentmodule.vala and I found this:
if (!is_pure_ccode_expression (lhs)) {
/* Assign lhs to temp var to avoid repeating side effect */
var lhs_value_type = assignment.left.value_type.copy ();
string lhs_temp_name = "_tmp%d_".printf (next_temp_var_id++);
var lhs_temp = new LocalVariable (lhs_value_type, "*" + lhs_temp_name);
emit_temp_var (lhs_temp);
ccode.add_assignment (get_variable_cexpression (lhs_temp_name), new
CCodeUnaryExpression (CCodeUnaryOperator.ADDRESS_OF, lhs));
lhs = new CCodeParenthesizedExpression (new CCodeUnaryExpression
(CCodeUnaryOperator.POINTER_INDIRECTION, get_variable_cexpression
(lhs_temp_name)));
}
What are the side effects corrected by the temporary variables ?
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