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   205 

   205 class constant_propagation_c : public constant_folding_c {

   206 class constant_propagation_c : public constant_folding_c {

   206   public:

   207   public:

   207     constant_propagation_c(symbol_c *symbol = NULL);

   208     constant_propagation_c(symbol_c *symbol = NULL);

   208     virtual ~constant_propagation_c(void);

   209     virtual ~constant_propagation_c(void);

   210   private:

   211   private:

   211     symbol_c *current_resource;

   212     symbol_c *current_resource;

   212     symbol_c *current_configuration;

   213     symbol_c *current_configuration;

   213     map_values_t *values;

   214     map_values_t *values;

   214     map_values_t var_global_values;

   215     map_values_t var_global_values;

   215     void *handle_var_list_decl(symbol_c *var_list, symbol_c *type_decl, bool is_global_var = false);

   219     void *handle_var_list_decl(symbol_c *var_list, symbol_c *type_decl, bool is_global_var = false);

   216     void *handle_var_decl     (symbol_c *var_list, bool fixed_init_value);

   220     void *handle_var_decl     (symbol_c *var_list, bool fixed_init_value);

   217     // Flag to indicate whether the variables in the variable declaration list will always have a fixed value when the POU is executed!

   221     // Flag to indicate whether the variables in the variable declaration list will always have a fixed value when the POU is executed!

   218     // VAR CONSTANT ... END_VAR will always be true

   222     // VAR CONSTANT ... END_VAR will always be true

   219     // VAR          ... END_VAR will always be true for functions (who initialise local variables every time they are called), but false for FBs and PROGRAMS

   223     // VAR          ... END_VAR will always be true for functions (who initialise local variables every time they are called), but false for FBs and PROGRAMS