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/*

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

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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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 * An IEC 61131-3 compiler.

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 *

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 * Based on the

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 * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)

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 *

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 */

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#ifndef _MAIN_HH

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#define _MAIN_HH

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 /* Function used throughout the code --> used to report failed assertions (i.e. internal compiler errors)! */

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#include <stddef.h>  /* required for NULL */

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#define ERROR               error_exit(__FILE__,__LINE__)

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#define ERROR_MSG(msg, ...) error_exit(__FILE__,__LINE__, msg)

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// #define ERROR_MSG(msg, ...) error_exit(__FILE__,__LINE__, msg, __VA_ARGS__)

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extern void error_exit(const char *file_name, int line_no, const char *errmsg = NULL, ...);

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 /* Get the definition of INT16_MAX, INT16_MIN, UINT64_MAX, INT64_MAX, INT64_MIN, ... */

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#define __STDC_LIMIT_MACROS /* required to have UINTxx_MAX defined when including stdint.h from C++ source code. */

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#include <stdint.h>         

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#include <limits>

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#ifndef   UINT64_MAX 

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  #define UINT64_MAX (std::numeric_limits< uint64_t >::max())

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#endif

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#ifndef    INT64_MAX 

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  #define  INT64_MAX (std::numeric_limits<  int64_t >::max())

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#endif

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#ifndef    INT64_MIN

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  #define  INT64_MIN (std::numeric_limits<  int64_t >::min()) 

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#endif

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/* Determine, for the current platform, which datas types (float, double or long double) use 64 and 32 bits. */

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/* NOTE: We cant use sizeof() in pre-processor directives, so we have to do it another way... */

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/* CURIOSITY: We can use sizeof() and offsetof() inside static_assert() but:

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 *          - this only allows us to make assertions, and not #define new macros

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 *          - 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.

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 *          https://www.securecoding.cert.org/confluence/display/seccode/DCL03-C.+Use+a+static+assertion+to+test+the+value+of+a+constant+expression

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 *         struct {int a, b, c, d} header_t;

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 *  e.g.:  static_assert(offsetof(struct header_t, c) == 8, "Compile time error message.");

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 */

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#include <float.h>

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#if    (LDBL_MANT_DIG == 53) /* NOTE: 64 bit IEC559 real has 53 bits for mantissa! */

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  #define long_double long double

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  #define real64_t long_double /* so we can later use #if (real64_t == long_double) directives in the code! */

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  #define REAL64_MAX  LDBL_MAX

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#elif  ( DBL_MANT_DIG == 53) /* NOTE: 64 bit IEC559 real has 53 bits for mantissa! */

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  #define real64_t double

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  #define REAL64_MAX  DBL_MAX

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#elif  ( FLT_MANT_DIG == 53) /* NOTE: 64 bit IEC559 real has 53 bits for mantissa! */

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  #define real64_t float

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  #define REAL64_MAX  FLT_MAX

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#else 

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  #error Could not find a 64 bit floating point data type on this platform. Aborting...

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#endif

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#if    (LDBL_MANT_DIG == 24) /* NOTE: 32 bit IEC559 real has 24 bits for mantissa! */

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  #ifndef long_double 

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    #define long_double long double

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  #endif  

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  #define real32_t long_double /* so we can later use #if (real32_t == long_double) directives in the code! */

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  #define REAL32_MAX  LDBL_MAX

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#elif  ( DBL_MANT_DIG == 24) /* NOTE: 32 bit IEC559 real has 24 bits for mantissa! */

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  #define real32_t double

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  #define REAL32_MAX  DBL_MAX

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#elif  ( FLT_MANT_DIG == 24) /* NOTE: 32 bit IEC559 real has 24 bits for mantissa! */

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  #define real32_t float

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  #define REAL32_MAX  FLT_MAX

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#else 

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  #error Could not find a 32 bit floating point data type on this platform. Aborting...

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#endif

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#include <math.h>

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#ifndef INFINITY

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  #error Could not find the macro that defines the value for INFINITY in the current platform.

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#endif

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#ifndef NAN

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  #error Could not find the macro that defines the value for NAN in the current platform.

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#endif

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#endif // #ifndef _MAIN_HH