--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.hh	Wed Aug 22 16:46:17 2012 +0200
@@ -0,0 +1,127 @@
+/*
+ *  matiec - a compiler for the programming languages defined in IEC 61131-3
+ *  Copyright (C) 2003-2011  Mario de Sousa (msousa@fe.up.pt)
+ *  Copyright (C) 2007-2011  Laurent Bessard and Edouard Tisserant
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 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.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ * 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 compiler.
+ *
+ * Based on the
+ * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
+ *
+ */
+
+
+
+#ifndef _MAIN_HH
+#define _MAIN_HH
+
+
+
+ /* Function used throughout the code --> used to report failed assertions (i.e. internal compiler errors)! */
+#include <stddef.h>  /* required for NULL */
+ 
+#define ERROR               error_exit(__FILE__,__LINE__)
+#define ERROR_MSG(msg, ...) error_exit(__FILE__,__LINE__, msg)
+// #define ERROR_MSG(msg, ...) error_exit(__FILE__,__LINE__, msg, __VA_ARGS__)
+
+extern void error_exit(const char *file_name, int line_no, const char *errmsg = NULL, ...);
+
+
+
+
+
+
+ /* Get the definition of INT16_MAX, INT16_MIN, UINT64_MAX, INT64_MAX, INT64_MIN, ... */
+
+#define __STDC_LIMIT_MACROS /* required to have UINTxx_MAX defined when including stdint.h from C++ source code. */
+#include <stdint.h>         
+#include <limits>
+
+#ifndef   UINT64_MAX 
+  #define UINT64_MAX (std::numeric_limits< uint64_t >::max())
+#endif
+#ifndef    INT64_MAX 
+  #define  INT64_MAX (std::numeric_limits<  int64_t >::max())
+#endif
+#ifndef    INT64_MIN
+  #define  INT64_MIN (std::numeric_limits<  int64_t >::min()) 
+#endif
+
+
+
+/* Determine, for the current platform, which datas types (float, double or long double) use 64 and 32 bits. */
+/* NOTE: We cant use sizeof() in pre-processor directives, so we have to do it another way... */
+/* CURIOSITY: We can use sizeof() and offsetof() inside static_assert() but:
+ *          - this only allows us to make assertions, and not #define new macros
+ *          - is only available in the C standard [ISO/IEC 9899:2011] and the C++ 0X draft standard [Becker 2008]. It is not available in C99.
+ *          https://www.securecoding.cert.org/confluence/display/seccode/DCL03-C.+Use+a+static+assertion+to+test+the+value+of+a+constant+expression
+ *         struct {int a, b, c, d} header_t;
+ *  e.g.:  static_assert(offsetof(struct header_t, c) == 8, "Compile time error message.");
+ */
+
+#include <float.h>
+#if    (LDBL_MANT_DIG == 53) /* NOTE: 64 bit IEC559 real has 53 bits for mantissa! */
+  #define long_double long double
+  #define real64_t long_double /* so we can later use #if (real64_t == long_double) directives in the code! */
+  #define REAL64_MAX  LDBL_MAX
+#elif  ( DBL_MANT_DIG == 53) /* NOTE: 64 bit IEC559 real has 53 bits for mantissa! */
+  #define real64_t double
+  #define REAL64_MAX  DBL_MAX
+#elif  ( FLT_MANT_DIG == 53) /* NOTE: 64 bit IEC559 real has 53 bits for mantissa! */
+  #define real64_t float
+  #define REAL64_MAX  FLT_MAX
+#else 
+  #error Could not find a 64 bit floating point data type on this platform. Aborting...
+#endif
+
+
+#if    (LDBL_MANT_DIG == 24) /* NOTE: 32 bit IEC559 real has 24 bits for mantissa! */
+  #ifndef long_double 
+    #define long_double long double
+  #endif  
+  #define real32_t long_double /* so we can later use #if (real32_t == long_double) directives in the code! */
+  #define REAL32_MAX  LDBL_MAX
+#elif  ( DBL_MANT_DIG == 24) /* NOTE: 32 bit IEC559 real has 24 bits for mantissa! */
+  #define real32_t double
+  #define REAL32_MAX  DBL_MAX
+#elif  ( FLT_MANT_DIG == 24) /* NOTE: 32 bit IEC559 real has 24 bits for mantissa! */
+  #define real32_t float
+  #define REAL32_MAX  FLT_MAX
+#else 
+  #error Could not find a 32 bit floating point data type on this platform. Aborting...
+#endif
+
+
+
+#include <math.h>
+#ifndef INFINITY
+  #error Could not find the macro that defines the value for INFINITY in the current platform.
+#endif
+#ifndef NAN
+  #error Could not find the macro that defines the value for NAN in the current platform.
+#endif
+
+
+
+
+
+#endif // #ifndef _MAIN_HH
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