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/*

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 *  matiec - a compiler for the programming languages defined in IEC 61131-3

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 *

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 *  Copyright (C) 2003-2011  Mario de Sousa (msousa@fe.up.pt)

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 *  Copyright (C) 2007-2011  Laurent Bessard and Edouard Tisserant

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 *

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 *  This program is free software: you can redistribute it and/or modify

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 *  it under the terms of the GNU General Public License as published by

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 *  the Free Software Foundation, either version 3 of the License, or

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 *  (at your option) any later version.

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 *

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 *  This program is distributed in the hope that it will be useful,

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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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 *  GNU General Public License for more details.

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 *

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 *  You should have received a copy of the GNU General Public License

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 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.

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 *

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 *

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 * This code is made available on the understanding that it will not be

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 * used in safety-critical situations without a full and competent review.

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 */

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/***********************************************************************/

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/***********************************************************************/

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/***********************************************************************/

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/***********************************************************************/

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/* Returns the data type of an il_operand.

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 *

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 * Note that the il_operand may be a variable, in which case

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 * we return the type of the variable instance.

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 * The il_operand may also be a constant, in which case

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 * we return the data type of that constant.

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 *

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 * The variable instance may be a member of a structured variable,

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 * or an element in an array, or any combination of the two.

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 *

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 * The class constructor must be given the search scope

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 * (function, function block or program within which

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 * the possible il_operand variable instance was declared).

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 */

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/***********************************************************************/

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/***********************************************************************/

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/***********************************************************************/

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/***********************************************************************/

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    50

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/* A new class to ouput the IL implicit variable to c++ code

    52

 * We use this class, inheriting from symbol_c, so it may be used

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 * as any other symbol_c object in the intermediate parse tree,

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 * more specifically, so it can be used as any other il operand.

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 * This makes the rest of the code much easier...

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 *

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 * Nevertheless, the basic visitor class visitor_c does not know

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 * how to visit this new il_default_variable_c class, so we have

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 * to extend that too.

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 * In reality extending the basic symbols doesn't quite work out

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 * as cleanly as desired (we need to use dynamic_cast in the

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 * accept method of the il_default_variable_c), but it is cleaner

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 * than the alternative...

    64

 */

    65

class il_default_variable_c;

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    67

/* This visitor class is not really required, we could place the

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 * visit() method directly in genertae_cc_il_c, but doing it in

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 * a seperate class makes the architecture more evident...

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 */

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class il_default_variable_visitor_c {

    72

  public:

    73

    virtual void *visit(il_default_variable_c *symbol) = 0;

    74

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    virtual ~il_default_variable_visitor_c(void) {return;}

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};

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    78

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/* A class to print out to the resulting C++ code

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 * the IL implicit variable name.

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 *

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 * It includes a reference to its name,

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 * and the data type of the data currently stored

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 * in this C++ variable... This is required because the

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 * C++ variable is a union, and we must know which member

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 * of the union top reference!!

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 *

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 * Note that we also need to keep track of the data type of

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 * the value currently being stored in the IL implicit variable.

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 * This is required so we can process parenthesis,

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 *

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 * e.g. :

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 *         LD var1

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 *         AND (

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 *         LD var2

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 *         OR var3

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 *         )

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 *

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 * Note that we only execute the 'AND (' operation when we come across

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 * the ')', i.e. once we have evaluated the result of the

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 * instructions inside the parenthesis.

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 * When we do execute the 'AND (' operation, we need to know the data type

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 * of the operand, which in this case is the result of the evaluation of the

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 * instruction list inside the parenthesis. We can only know this if we

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 * keep track of the data type currently stored in the IL implicit variable!

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 *

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 * We use the current_type inside the generate_c_il::default_variable_name variable

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 * to track this!

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 */

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class il_default_variable_c: public symbol_c {

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  public:

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    symbol_c *var_name;  /* in principle, this should point to an indentifier_c */

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   114

  public:

   115

    il_default_variable_c(const char *var_name_str, symbol_c *current_type);

   116

    virtual void *accept(visitor_c &visitor);

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};

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/***********************************************************************/

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/***********************************************************************/

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/***********************************************************************/

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/***********************************************************************/

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class generate_c_il_c: public generate_c_typedecl_c, il_default_variable_visitor_c {

   130

   131

  public:

   132

    typedef enum {

   133

      expression_vg,

   134

      assignment_vg,

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      complextype_base_vg,

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      complextype_base_assignment_vg,

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      complextype_suffix_vg,

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      fparam_output_vg

   139

    } variablegeneration_t;

   140

   141

  private:

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    /* Label to which the current IL jump operation should jump to... */

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    /* This variable is used to pass data from the

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     * il_jump_operation_c visitor

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     * to the il jump operator visitors (i.e. JMP_operator_c,

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     * JMPC_operator_c, JMPCN_operator_c, ...)

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     */

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    symbol_c *jump_label;

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    /* the data type of the IL implicit variable... */

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    #define IL_DEFVAR_T VAR_LEADER "IL_DEFVAR_T"

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    /* The name of the IL implicit variable... */

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    #define IL_DEFVAR   VAR_LEADER "IL_DEFVAR"

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    /* The name of the variable used to pass the result of a

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     * parenthesised instruction list to the immediately preceding

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     * scope ...

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     */

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    #define IL_DEFVAR_BACK   VAR_LEADER "IL_DEFVAR_BACK"

   159

   160

    il_default_variable_c implicit_variable_current;      /* the current   implicit variable, with the datatype resulting from the previous IL operation */

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    il_default_variable_c implicit_variable_result;       /* the resulting implicit variable, with the datatype resulting from the current  IL operation */

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    il_default_variable_c implicit_variable_result_back;

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    /* Operand to the IL operation currently being processed... */

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    /* These variables are used to pass data from the

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     * il_simple_operation_c and il_expression_c visitors

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     * to the il operator visitors (i.e. LD_operator_c,

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     * LDN_operator_c, ST_operator_c, STN_operator_c, ...)

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     */

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    symbol_c *current_operand;

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    /* When calling a function block, we must first find it's type,

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     * by searching through the declarations of the variables currently

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     * in scope.

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     * This class does just that...

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     * A new class is instantiated whenever we begin generating the code

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     * for a function block type declaration, or a program declaration.

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     * This object instance will then later be called while the

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     * function block's or the program's body is being handled.

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     *

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     * Note that functions cannot contain calls to function blocks,

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     * so we do not create an object instance when handling

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     * a function declaration.

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     */

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    search_fb_instance_decl_c *search_fb_instance_decl;

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    search_varfb_instance_type_c *search_varfb_instance_type;

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    search_var_instance_decl_c   *search_var_instance_decl;

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    symbol_c* current_array_type;

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    symbol_c* current_param_type;

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    int fcall_number;

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    symbol_c *fbname;

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    variablegeneration_t wanted_variablegeneration;

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  public:

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    generate_c_il_c(stage4out_c *s4o_ptr, symbol_c *name, symbol_c *scope, const char *variable_prefix = NULL)

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    : generate_c_typedecl_c(s4o_ptr),

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      implicit_variable_current    (IL_DEFVAR,      NULL),

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      implicit_variable_result     (IL_DEFVAR,      NULL),

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      implicit_variable_result_back(IL_DEFVAR_BACK, NULL)

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    {

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      search_fb_instance_decl    = new search_fb_instance_decl_c   (scope);

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      search_varfb_instance_type = new search_varfb_instance_type_c(scope);

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      search_var_instance_decl   = new search_var_instance_decl_c  (scope);

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      current_operand = NULL;

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      current_array_type = NULL;

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      current_param_type = NULL;

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      fcall_number = 0;

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      fbname = name;

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      wanted_variablegeneration = expression_vg;

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      this->set_variable_prefix(variable_prefix);

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    }

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    virtual ~generate_c_il_c(void) {

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      delete search_fb_instance_decl;

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      delete search_varfb_instance_type;

   221

      delete search_var_instance_decl;

   222

    }

   223

   224

    void generate(instruction_list_c *il) {

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      il->accept(*this);

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    }

   227

   228

  private:

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    /* Declare an implicit IL variable... */

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    void declare_implicit_variable(il_default_variable_c *implicit_var) {

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      s4o.print(s4o.indent_spaces);

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      s4o.print(IL_DEFVAR_T);

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      s4o.print(" ");

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      implicit_var->datatype = NULL;

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      implicit_var->accept(*this);

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      s4o.print(";\n");

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    }

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   239

  public:  

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    /* Declare the default variable, that will store the result of the IL operations */

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    void declare_implicit_variable(void) {

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      declare_implicit_variable(&this->implicit_variable_result);

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    }

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    /* Declare the backup to the default variable, that will store the result of the IL operations executed inside a parenthesis... */

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    void declare_implicit_variable_back(void) {

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      declare_implicit_variable(&this->implicit_variable_result_back);

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    }

   249

   250

    void print_implicit_variable_back(void) {

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      this->implicit_variable_result_back.accept(*this);

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    }    

   253

   254

   255

  private:

   256

    /* a small helper function */

   257

    symbol_c *default_literal_type(symbol_c *symbol) {

   258

      if (get_datatype_info_c::is_ANY_INT_literal(symbol)) {

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        return &get_datatype_info_c::lint_type_name;

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      }

   261

      else if (get_datatype_info_c::is_ANY_REAL_literal(symbol)) {

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        return &get_datatype_info_c::lreal_type_name;

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      }

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      return symbol;

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    }

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    /* A helper function... */

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    void *XXX_operator(symbol_c *lo, const char *op, symbol_c *ro) {

   269

      if ((NULL == lo) || (NULL == ro) || (NULL == op)) ERROR;

   270

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      lo->accept(*this);

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      s4o.print(op);

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      ro->accept(*this);

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      return NULL;

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    }

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    /* A helper function... */

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    void *XXX_function(symbol_c *res, const char *func, symbol_c *lo, symbol_c *ro) {

   279

      if ((NULL == res) || (NULL == lo) || (NULL == ro)) ERROR;

   280

      if  (NULL == func) ERROR;

   281

   282

      res->accept(*this);

   283

      s4o.print(" = ");

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      s4o.print(func);

   285

      s4o.print("(");

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      lo->accept(*this);

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      s4o.print(", ");

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      ro->accept(*this);

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      s4o.print(")");

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      return NULL;

   291

    }

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    /* A helper function... used for implicit FB calls: S1, R1, CLK, CU, CD, PV, IN, and PT */

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    void *XXX_CAL_operator(const char *param_name, symbol_c *fb_name) {

   295

      if (wanted_variablegeneration != expression_vg) {

   296

        s4o.print(param_name);

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        return NULL;

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      }

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   300

      if (NULL == fb_name) ERROR;

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      symbolic_variable_c *sv = dynamic_cast<symbolic_variable_c *>(fb_name);

   302

      if (NULL == sv) ERROR;

   303

      identifier_c *id = dynamic_cast<identifier_c *>(sv->var_name);

   304

      if (NULL == id) ERROR;

   305

   306

      identifier_c param(param_name);

   307

   308

      //SYM_REF3(il_param_assignment_c, il_assign_operator, il_operand, simple_instr_list)

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      il_assign_operator_c il_assign_operator(&param);

   310

      il_param_assignment_c il_param_assignment(&il_assign_operator, &this->implicit_variable_current, NULL);

   311

      // SYM_LIST(il_param_list_c)

   312

      il_param_list_c il_param_list;   

   313

      il_param_list.add_element(&il_param_assignment);

   314

      CAL_operator_c CAL_operator;

   315

      // SYM_REF4(il_fb_call_c, il_call_operator, fb_name, il_operand_list, il_param_list)

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      il_fb_call_c il_fb_call(&CAL_operator, id, NULL, &il_param_list);

   317

   318

      il_fb_call.accept(*this);

   319

      return NULL;

   320

    }

   321

   322

    /* A helper function... */

   323

    void *CMP_operator(symbol_c *operand, const char *operation) {

   324

      if (NULL == operand) ERROR;

   325

      if (NULL == operand->datatype) ERROR;

   326

      if (NULL == this->implicit_variable_current.datatype) ERROR;

   327

   328

      this->implicit_variable_result.accept(*this);

   329

      s4o.print(" = ");

   330

      s4o.print(operation);

   331

      operand->datatype->accept(*this);

   332

      /* NOTE: we are calling a standard Function: 

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       *         1st parameter: EN  (enable)

   334

       *         2nd parameter: ENO (enable output)

   335

       *         3rd parameter: number of operands we will be passing (required because we are calling an extensible standard function!)

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       *         4th parameter: the left  hand side of the comparison expression (in out case, the IL implicit variable)

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       *         4th parameter: the right hand side of the comparison expression (in out case, current operand)

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       */

   339

      s4o.print("(__BOOL_LITERAL(TRUE), NULL, 2, ");

   340

      this->implicit_variable_current.accept(*this);

   341

      s4o.print(", ");

   342

      operand->accept(*this);

   343

      s4o.print(")");

   344

   345

      return NULL;

   346

    }

   347

   348

   349

    /* A helper function... */

   350

    void C_modifier(void) {

   351

      if (!get_datatype_info_c::is_BOOL_compatible(implicit_variable_current.datatype)) ERROR;

   352

      s4o.print("if (");

   353

      this->implicit_variable_current.accept(*this);

   354

      s4o.print(") ");

   355

    }

   356

   357

    /* A helper function... */

   358

    void CN_modifier(void) {

   359

      if (!get_datatype_info_c::is_BOOL_compatible(implicit_variable_current.datatype)) ERROR;

   360

      s4o.print("if (!");

   361

      this->implicit_variable_current.accept(*this);

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      s4o.print(") ");

   363

    }

   364

   365

   366

    void *print_getter(symbol_c *symbol) {

   367

      unsigned int vartype = search_var_instance_decl->get_vartype(symbol);

   368

      if (wanted_variablegeneration == fparam_output_vg) {

   369

        if (vartype == search_var_instance_decl_c::external_vt) {

   370

          if (search_var_instance_decl->type_is_fb(symbol))

   371

            s4o.print(GET_EXTERNAL_FB_BY_REF);

   372

          else

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            s4o.print(GET_EXTERNAL_BY_REF);

   374

        }

   375

        else if (vartype == search_var_instance_decl_c::located_vt)

   376

          s4o.print(GET_LOCATED_BY_REF);

   377

        else

   378

          s4o.print(GET_VAR_BY_REF);

   379

      }

   380

      else {

   381

        if (vartype == search_var_instance_decl_c::external_vt) {

   382

          if (search_var_instance_decl->type_is_fb(symbol))

   383

            s4o.print(GET_EXTERNAL_FB);

   384

          else

   385

            s4o.print(GET_EXTERNAL);

   386

        }

   387

        else if (vartype == search_var_instance_decl_c::located_vt)

   388

          s4o.print(GET_LOCATED);

   389

        else

   390

          s4o.print(GET_VAR);

   391

      }

   392

      s4o.print("(");

   393

   394

      variablegeneration_t old_wanted_variablegeneration = wanted_variablegeneration;

   395

      wanted_variablegeneration = complextype_base_vg;

   396

      symbol->accept(*this);

   397

      if (search_var_instance_decl->type_is_complex(symbol))

   398

        s4o.print(",");

   399

      wanted_variablegeneration = complextype_suffix_vg;

   400

      symbol->accept(*this);

   401

      s4o.print(")");

   402

      wanted_variablegeneration = old_wanted_variablegeneration;

   403

      return NULL;

   404

    }

   405

   406

    void *print_setter(symbol_c* symbol,

   407

            symbol_c* type,

   408

            symbol_c* value,

   409

            symbol_c* fb_symbol = NULL,

   410

            symbol_c* fb_value = NULL,

   411

            bool negative = false) {

   412

   414

      if (fb_symbol == NULL) {

   415

        unsigned int vartype = search_var_instance_decl->get_vartype(symbol);

   417

        if (vartype == search_var_instance_decl_c::external_vt) {

   418

          if (search_var_instance_decl->type_is_fb(symbol))

   419

            s4o.print(SET_EXTERNAL_FB);

   420

          else

   421

            s4o.print(SET_EXTERNAL);

   422

        }

   423

        else if (vartype == search_var_instance_decl_c::located_vt)

   424

          s4o.print(SET_LOCATED);

   425

        else

   426

          s4o.print(SET_VAR);

   427

      }

   428

      else {

   429

        unsigned int vartype = search_var_instance_decl->get_vartype(fb_symbol);

   430

        if (vartype == search_var_instance_decl_c::external_vt)

   431

          s4o.print(SET_EXTERNAL_FB);

   432

        else

   433

          s4o.print(SET_VAR);

   434

      }

   435

      s4o.print("(");

   436

   437

      if (fb_symbol != NULL) {

   438

        print_variable_prefix();

   439

        fb_symbol->accept(*this);

   440

        s4o.print(".,");

   441

      }

   442

      else if (type_is_complex)

   443

        wanted_variablegeneration = complextype_base_assignment_vg;

   444

      else

   445

        wanted_variablegeneration = assignment_vg;

   446

   447

      symbol->accept(*this);

   448

      s4o.print(",");

   449

      if (negative) {

   450

        if (get_datatype_info_c::is_BOOL_compatible(this->current_operand->datatype))

   451

          s4o.print("!");

   452

        else

   453

          s4o.print("~");

   454

      }

   455

      wanted_variablegeneration = expression_vg;

   456

      print_check_function(type, value, fb_value);

   457

      if (type_is_complex) {

   458

        s4o.print(",");

   459

        wanted_variablegeneration = complextype_suffix_vg;

   460

        symbol->accept(*this);

   461

      }

   462

      s4o.print(")");

   463

      wanted_variablegeneration = expression_vg;

   464

      return NULL;

   465

    }

   466

   467

public:

   468

void *visit(il_default_variable_c *symbol) {

   469

  symbol->var_name->accept(*this);

   470

  if (NULL != symbol->datatype) {

   471

    s4o.print(".");

   472

    symbol->datatype->accept(*this);

   473

    s4o.print("var");

   474

  } return NULL;

   475

}

   476

   477

   478

private:

   479

   480

   481

   482

/********************************/

   483

/* B 1.3.3 - Derived data types */

   484

/********************************/

   485

   486

/*  signed_integer DOTDOT signed_integer */

   487

void *visit(subrange_c *symbol) {

   488

  symbol->lower_limit->accept(*this);

   489

  return NULL;

   490

}

   491

   492

/* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */

   493

void *visit(array_specification_c *symbol) {

   494

  symbol->non_generic_type_name->accept(*this);

   495

  return NULL;

   496

}

   497

   498

/*********************/

   499

/* B 1.4 - Variables */

   500

/*********************/

   501