diff -r 41cb5b80416e -r e1f0ebd2d9ec stage4/generate_c/generate_c_base.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/stage4/generate_c/generate_c_base.cc	Wed Oct 24 17:39:51 2007 +0200
@@ -0,0 +1,668 @@
+/*
+ * (c) 2003 Mario de Sousa
+ *
+ * Offered to the public under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+ * Public License for more details.
+ *
+ * This code is made available on the understanding that it will not be
+ * used in safety-critical situations without a full and competent review.
+ */
+
+/*
+ * An IEC 61131-3 IL and ST compiler.
+ *
+ * Based on the
+ * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
+ *
+ */
+
+
+/*
+ * Conversion of basic abstract syntax constructs.
+ *
+ * This is part of the 4th stage that generates
+ * a c++ source program equivalent to the IL and ST
+ * code.
+ */
+
+
+
+
+
+
+//#include <stdio.h>  /* required for NULL */
+//#include <string>
+//#include <iostream>
+
+//#include "../../util/symtable.hh"
+
+//#include "generate_c.hh"
+
+
+
+
+
+
+
+
+
+
+
+
+
+class generate_c_base_c: public iterator_visitor_c {
+
+  protected:
+    stage4out_c &s4o;
+
+  private:
+    /* Unlike programs that are mapped onto C++ classes, Function Blocks are mapped onto a data structure type
+     * and a separate function conatining the code. This function is passed a pointer to an instance of the data
+     * structure. This means that the code inside the functions must insert a pointer to the data structure whenever
+     * it wishes to access a Function Block variable.
+     * The variable_prefix_ variable will contain the correct string which needs to be prefixed to all variable accesses.
+     * This string is set with the set_variable_prefix() member function.
+     */
+    const char *variable_prefix_;
+
+
+
+  public:
+    generate_c_base_c(stage4out_c *s4o_ptr): s4o(*s4o_ptr) {variable_prefix_ = NULL;}
+    ~generate_c_base_c(void) {}
+
+    void set_variable_prefix(const char *variable_prefix) {variable_prefix_ = variable_prefix;}
+    void print_variable_prefix(void) {
+      if (variable_prefix_ != NULL)
+        s4o.print(variable_prefix_);
+    }
+
+    void *print_token(token_c *token, int offset = 0) {
+      return s4o.printupper((token->value)+offset);
+    }
+
+    void *print_literal(symbol_c *type, symbol_c *value) {
+      s4o.print("__");
+      type->accept(*this);
+      s4o.print("_LITERAL(");
+      value->accept(*this);
+      s4o.print(")");
+      return NULL;
+    }
+
+    void *print_striped_token(token_c *token, int offset = 0) {
+      std::string str = "";
+      for (unsigned int i = offset; i < strlen(token->value); i++)
+        if (token->value[i] != '_')
+          str += token->value[i];
+      return s4o.printupper(str);
+    }
+
+    void *print_striped_binary_token(token_c *token, unsigned int offset = 0) {
+      /* convert the binary value to hexadecimal format... */
+      unsigned char value, bit_mult;
+      unsigned int i;
+      int total_bits;
+      char str[2] = {'A', '\0'};  /* since the s4o object is not prepared to print out one character at a time... */
+
+      s4o.print("0x");
+
+      total_bits = 0;
+      for (i = offset; i < strlen(token->value); i++)
+        if (token->value[i] != '_')
+	  total_bits++;
+
+      value = 0;
+      bit_mult = (unsigned char)1 << (((total_bits+3)%4)+1);
+      for (i = offset; i < strlen(token->value); i++) {
+        if (token->value[i] != '_') {
+	  bit_mult /= 2;
+	  value += bit_mult * ((token->value[i] == '0')? 0:1);
+	  if (bit_mult == 1) {
+	    str[0] = (value <= 9)? (char)'0' + value : (char)'A' + value;
+	    s4o.print(str);
+            bit_mult = 0x10;
+            value = 0;
+	  }
+	}
+      }
+
+      return NULL;
+    }
+
+    void *print_list(list_c *list,
+		     std::string pre_elem_str = "",
+		     std::string inter_elem_str = "",
+		     std::string post_elem_str = "",
+		     visitor_c *visitor = NULL) {
+      if (visitor == NULL) visitor = this;
+
+      if (list->n > 0) {
+//std::cout << "generate_c_base_c::print_list(n = " << list->n << ")   000\n";
+        s4o.print(pre_elem_str);
+        list->elements[0]->accept(*visitor);
+      }
+
+      for(int i = 1; i < list->n; i++) {
+//std::cout << "generate_c_base_c::print_list   " << i << "\n";
+        s4o.print(inter_elem_str);
+        list->elements[i]->accept(*visitor);
+      }
+
+      if (list->n > 0)
+        s4o.print(post_elem_str);
+
+      return NULL;
+    }
+
+
+    void *print_binary_expression(symbol_c *l_exp,
+				  symbol_c *r_exp,
+				  const char *operation) {
+      s4o.print("(");
+      l_exp->accept(*this);
+      s4o.print(operation);
+      r_exp->accept(*this);
+      s4o.print(")");
+      return NULL;
+    }
+
+    void *print_unary_expression(symbol_c *exp,
+				 const char *operation) {
+      s4o.print(operation);
+      s4o.print("(");
+      exp->accept(*this);
+      s4o.print(")");
+      return NULL;
+    }
+
+    void *print_binary_function(const char *function,
+          symbol_c *l_exp,
+				  symbol_c *r_exp) {
+      s4o.print(function);
+      s4o.print("(");
+      l_exp->accept(*this);
+      s4o.print(", ");
+      r_exp->accept(*this);
+      s4o.print(")");
+      return NULL;
+   	}
+
+    void *print_compare_function(const char *function,
+          symbol_c *compare_type,
+          symbol_c *l_exp,
+          symbol_c *r_exp) {
+      s4o.print(function);
+      compare_type->accept(*this);
+      s4o.print("(2, ");
+      l_exp->accept(*this);
+      s4o.print(", ");
+      r_exp->accept(*this);
+      s4o.print(")");
+      return NULL;
+    }
+
+/***************************/
+/* 2.1.6 - Pragmas */
+/***************************/
+    /* Do not use print_token() as it will change everything into uppercase */
+    void *visit(pragma_c *symbol) {return s4o.print(symbol->value);}
+
+
+/***************************/
+/* B 0 - Programming Model */
+/***************************/
+  /* leave for derived classes... */
+
+
+
+/*************************/
+/* B.1 - Common elements */
+/*************************/
+/*******************************************/
+/* B 1.1 - Letters, digits and identifiers */
+/*******************************************/
+    void *visit(identifier_c *symbol) {return print_token(symbol);}
+
+/*********************/
+/* B 1.2 - Constants */
+/*********************/
+  /* originally empty... */
+
+/******************************/
+/* B 1.2.1 - Numeric Literals */
+/******************************/
+    void *visit(real_c *symbol) {return print_striped_token(symbol);}
+    void *visit(integer_c *symbol) {return print_striped_token(symbol);}
+    void *visit(binary_integer_c *symbol) {return print_striped_binary_token(symbol, 2);}
+    void *visit(octal_integer_c *symbol) {s4o.print("0"); return print_striped_token(symbol, 2);}
+    void *visit(hex_integer_c *symbol) {s4o.print("0x"); return print_striped_token(symbol, 3);}
+
+    void *visit(numeric_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}
+    void *visit(integer_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}
+    void *visit(real_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}
+    void *visit(bit_string_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}
+    void *visit(boolean_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}
+
+    /* helper class for boolean_literal_c */
+    void *visit(boolean_true_c *symbol) {s4o.print("TRUE"); return NULL;}
+    void *visit(boolean_false_c *symbol) {s4o.print("FALSE"); return NULL;}
+
+/*******************************/
+/* B.1.2.2   Character Strings */
+/*******************************/
+    void *visit(double_byte_character_string_c *symbol) {
+      // TO DO ...
+      ERROR;
+      return print_token(symbol);
+    }
+
+    void *visit(single_byte_character_string_c *symbol) {
+      std::string str = "";
+      unsigned int count = 0; 
+      str += '"';
+      /* we ignore the first and last bytes, they will be the character ' */
+      for (unsigned int i = 1; i < strlen(symbol->value) - 1; i++) {
+        char c = symbol->value[i];
+        if ((c == '\\') || (c == '"'))
+          {str += '\\'; str += c; count ++; continue;}
+        if (c != '$')
+          {str += c; count++; continue;}
+        /* this should be safe, since the code has passed the syntax parser!! */
+        c = symbol->value[++i];
+        switch (c) {
+          case '$':
+          case '\'':
+            {str += c; count++; continue;}
+          case 'L':
+          case 'l':
+            {str += "\x0A"; /* LF */; count++; continue;}
+          case 'N':
+          case 'n':
+            {str += "\\x0A"; /* NL */; count++; continue;}
+          case 'P':
+          case 'p':
+            {str += "\\f"; /* FF */; count++; continue;}
+          case 'R':
+          case 'r':
+            {str += "\\r"; /* CR */; count++; continue;}
+          case 'T':
+          case 't':
+            {str += "\\t"; /* tab */; count++; continue;}
+          default: {
+            if (isxdigit(c)) {
+              /* this should be safe, since the code has passed the syntax parser!! */
+	      char c2 = symbol->value[++i];
+	      if (isxdigit(c2)) {
+	        str += '\\'; str += 'x'; str += c; str += c2;
+	        count++; continue;
+	      }
+	    }
+          }
+          /* otherwise we have an invalid string!! */
+          /* This should not have got through the syntax parser! */
+          ERROR;
+        } /* switch() */
+      } /* for() */
+
+      str += '"';
+      s4o.print("(STRING){");
+      s4o.print_integer(count); 
+      s4o.print(",");
+      s4o.print(str);
+      s4o.print("}");
+      return NULL;
+    }
+
+
+/***************************/
+/* B 1.2.3 - Time Literals */
+/***************************/
+
+/************************/
+/* B 1.2.3.1 - Duration */
+/************************/
+/* The following output is actually the parameters to the constructor of the TIME class! */
+
+/* SYM_REF0(neg_time_c) */
+void *visit(neg_time_c *symbol) {s4o.print("-1"); /* negative time value */; return NULL;}
+
+
+/* SYM_REF2(duration_c, neg, interval) */
+void *visit(duration_c *symbol) {
+  TRACE("duration_c");
+  s4o.print("__time_to_timespec(");
+  if (NULL == symbol->neg)
+    s4o.print("1");  /* positive time value */
+  else
+    symbol->neg->accept(*this);  /* this will print '-1'   :-) */
+
+  s4o.print(", ");
+
+  symbol->interval->accept(*this);
+  if (typeid(*symbol->interval) == typeid(hours_c)) {s4o.print(", 0");}
+  if (typeid(*symbol->interval) == typeid(minutes_c)) {s4o.print(", 0, 0");}
+  if (typeid(*symbol->interval) == typeid(seconds_c)) {s4o.print(", 0, 0, 0");}
+  if (typeid(*symbol->interval) == typeid(milliseconds_c)) {s4o.print(", 0, 0, 0, 0");}
+  s4o.print(")");
+  return NULL;
+}
+
+
+/* SYM_TOKEN(fixed_point_c) */
+void *visit(fixed_point_c *symbol) {return print_token(symbol);}
+
+
+/* SYM_REF2(days_c, days, hours) */
+void *visit(days_c *symbol) {
+  TRACE("days_c");
+  if (NULL == symbol->hours)
+    s4o.print("0, 0, 0, 0");  /* milliseconds, seconds, minutes, hours */
+  else
+    symbol->hours->accept(*this);
+
+  s4o.print(", ");
+
+  symbol->days->accept(*this);
+  return NULL;
+}
+
+
+/* SYM_REF2(hours_c, hours, minutes) */
+void *visit(hours_c *symbol) {
+  TRACE("hours_c");
+  if (NULL == symbol->minutes)
+    s4o.print("0, 0, 0");  /* milliseconds, seconds, minutes */
+  else
+    symbol->minutes->accept(*this);
+
+  s4o.print(", ");
+
+  symbol->hours->accept(*this);
+  return NULL;
+}
+
+
+/* SYM_REF2(minutes_c, minutes, seconds) */
+void *visit(minutes_c *symbol) {
+  TRACE("minutes_c");
+  if (NULL == symbol->seconds)
+    s4o.print("0, 0");  /* milliseconds, seconds */
+  else
+    symbol->seconds->accept(*this);
+
+  s4o.print(", ");
+
+  symbol->minutes->accept(*this);
+  return NULL;
+}
+
+
+/* SYM_REF2(seconds_c, seconds, milliseconds) */
+void *visit(seconds_c *symbol) {
+  TRACE("seconds_c");
+  if (NULL == symbol->milliseconds)
+    s4o.print("0");  /* milliseconds */
+  else
+    symbol->milliseconds->accept(*this);
+
+  s4o.print(", ");
+
+  symbol->seconds->accept(*this);
+  return NULL;
+}
+
+
+/* SYM_REF2(milliseconds_c, milliseconds, unused) */
+void *visit(milliseconds_c *symbol) {
+  TRACE("milliseconds_c");
+  symbol->milliseconds->accept(*this);
+  return NULL;
+}
+
+/************************************/
+/* B 1.2.3.2 - Time of day and Date */
+/************************************/
+
+/* SYM_REF2(time_of_day_c, daytime, unused) */
+void *visit(time_of_day_c *symbol) {
+  TRACE("time_of_day_c");
+  s4o.print("__tod_to_timespec(");
+  symbol->daytime->accept(*this);
+  s4o.print(")");
+  return NULL;
+}
+
+
+/* SYM_REF4(daytime_c, day_hour, day_minute, day_second, unused) */
+void *visit(daytime_c *symbol) {
+  TRACE("daytime_c");
+  symbol->day_second->accept(*this);
+  s4o.print(", ");
+  symbol->day_minute->accept(*this);
+  s4o.print(", ");
+  symbol->day_hour->accept(*this);
+  return NULL;
+}
+
+
+/* SYM_REF2(date_c, date_literal, unused) */
+void *visit(date_c *symbol) {
+  TRACE("date_c");
+  s4o.print("__date_to_timespec(");
+  symbol->date_literal->accept(*this);
+  s4o.print(")");
+  return NULL;
+}
+
+
+/* SYM_REF4(date_literal_c, year, month, day, unused) */
+void *visit(date_literal_c *symbol) {
+  TRACE("date_literal_c");
+  symbol->day->accept(*this);
+  s4o.print(", ");
+  symbol->month->accept(*this);
+  s4o.print(", ");
+  symbol->year->accept(*this);
+  return NULL;
+}
+
+
+/* SYM_REF2(date_and_time_c, date_literal, daytime) */
+void *visit(date_and_time_c *symbol) {
+  TRACE("date_and_time_c");
+  s4o.print("__dt_to_timespec(");
+  symbol->daytime->accept(*this);
+  s4o.print(", ");
+  symbol->date_literal->accept(*this);
+  s4o.print(")");
+  return NULL;
+}
+
+
+/**********************/
+/* B.1.3 - Data types */
+/**********************/
+/***********************************/
+/* B 1.3.1 - Elementary Data Types */
+/***********************************/
+    void *visit(time_type_name_c *symbol) {s4o.print("TIME"); return NULL;}
+    void *visit(bool_type_name_c *symbol) {s4o.print("BOOL"); return NULL;}
+    void *visit(sint_type_name_c *symbol) {s4o.print("SINT"); return NULL;}
+    void *visit(int_type_name_c *symbol) {s4o.print("INT"); return NULL;}
+    void *visit(dint_type_name_c *symbol) {s4o.print("DINT"); return NULL;}
+    void *visit(lint_type_name_c *symbol) {s4o.print("LINT"); return NULL;}
+    void *visit(usint_type_name_c *symbol) {s4o.print("USINT"); return NULL;}
+    void *visit(uint_type_name_c *symbol) {s4o.print("UINT"); return NULL;}
+    void *visit(udint_type_name_c *symbol) {s4o.print("UDINT"); return NULL;}
+    void *visit(ulint_type_name_c *symbol) {s4o.print("ULINT"); return NULL;}
+    void *visit(real_type_name_c *symbol) {s4o.print("REAL"); return NULL;}
+    void *visit(lreal_type_name_c *symbol) {s4o.print("LREAL"); return NULL;}
+    void *visit(date_type_name_c *symbol) {s4o.print("DATE"); return NULL;}
+    void *visit(tod_type_name_c *symbol) {s4o.print("TOD"); return NULL;}
+    void *visit(dt_type_name_c *symbol) {s4o.print("DT"); return NULL;}
+    void *visit(byte_type_name_c *symbol) {s4o.print("BYTE"); return NULL;}
+    void *visit(word_type_name_c *symbol) {s4o.print("WORD"); return NULL;}
+    void *visit(lword_type_name_c *symbol) {s4o.print("LWORD"); return NULL;}
+    void *visit(dword_type_name_c *symbol) {s4o.print("DWORD"); return NULL;}
+    void *visit(string_type_name_c *symbol) {s4o.print("STRING"); return NULL;}
+    void *visit(wstring_type_name_c *symbol) {s4o.print("WSTRING"); return NULL;}
+
+/********************************/
+/* B.1.3.2 - Generic data types */
+/********************************/
+  /* originally empty... */
+
+/********************************/
+/* B 1.3.3 - Derived data types */
+/********************************/
+  /* leave for derived classes... */
+
+/*********************/
+/* B 1.4 - Variables */
+/*********************/
+void *visit(symbolic_variable_c *symbol) {
+  TRACE("symbolic_variable_c");
+  this->print_variable_prefix();
+  symbol->var_name->accept(*this);
+  return NULL;
+}
+
+/********************************************/
+/* B.1.4.1   Directly Represented Variables */
+/********************************************/
+void *visit(direct_variable_c *symbol) {
+  TRACE("direct_variable_c");
+  /* Do not use print_token() as it will change everything into uppercase */
+  return s4o.printlocation(symbol->value);
+}
+
+
+
+/*************************************/
+/* B.1.4.2   Multi-element Variables */
+/*************************************/
+#if 0
+/*  subscripted_variable '[' subscript_list ']' */
+SYM_REF2(array_variable_c, subscripted_variable, subscript_list)
+
+/* subscript_list ',' subscript */
+SYM_LIST(subscript_list_c)
+#endif
+
+/*  record_variable '.' field_selector */
+/*  WARNING: input and/or output variables of function blocks
+ *           may be accessed as fields of a structured variable!
+ *           Code handling a structured_variable_c must take
+ *           this into account!
+ */
+// SYM_REF2(structured_variable_c, record_variable, field_selector)
+void *visit(structured_variable_c *symbol) {
+  TRACE("structured_variable_c");
+
+  symbol->record_variable->accept(*this);
+  s4o.print(".");
+  symbol->field_selector->accept(*this);
+  return NULL;
+}
+
+/******************************************/
+/* B 1.4.3 - Declaration & Initialisation */
+/******************************************/
+  /* leave for derived classes... */
+
+/**************************************/
+/* B.1.5 - Program organization units */
+/**************************************/
+/***********************/
+/* B 1.5.1 - Functions */
+/***********************/
+  /* leave for derived classes... */
+
+/*****************************/
+/* B 1.5.2 - Function Blocks */
+/*****************************/
+  /* leave for derived classes... */
+
+/**********************/
+/* B 1.5.3 - Programs */
+/**********************/
+  /* leave for derived classes... */
+
+/*********************************************/
+/* B.1.6  Sequential function chart elements */
+/*********************************************/
+
+/********************************/
+/* B 1.7 Configuration elements */
+/********************************/
+  /* leave for derived classes... */
+
+/****************************************/
+/* B.2 - Language IL (Instruction List) */
+/****************************************/
+/***********************************/
+/* B 2.1 Instructions and Operands */
+/***********************************/
+  /* leave for derived classes... */
+
+/*******************/
+/* B 2.2 Operators */
+/*******************/
+  /* leave for derived classes... */
+
+
+/***************************************/
+/* B.3 - Language ST (Structured Text) */
+/***************************************/
+/***********************/
+/* B 3.1 - Expressions */
+/***********************/
+  /* leave for derived classes... */
+
+/********************/
+/* B 3.2 Statements */
+/********************/
+  /* leave for derived classes... */
+
+/*********************************/
+/* B 3.2.1 Assignment Statements */
+/*********************************/
+  /* leave for derived classes... */
+
+/*****************************************/
+/* B 3.2.2 Subprogram Control Statements */
+/*****************************************/
+  /* leave for derived classes... */
+
+/********************************/
+/* B 3.2.3 Selection Statements */
+/********************************/
+  /* leave for derived classes... */
+
+/********************************/
+/* B 3.2.4 Iteration Statements */
+/********************************/
+  /* leave for derived classes... */
+
+}; /* class generate_c_basic_c */
+
+
+
+
+
+
+
+
+
+
+
+
+
+