cpu.h

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/* This file is part of Cloudy and is copyright (C)1978-2013 by Gary J. Ferland and
 * others.  For conditions of distribution and use see copyright notice in license.txt */

#ifndef CPU_H_
#define CPU_H_

/* disable conditional expressions is constant */
#ifdef _MSC_VER
#pragma warning( disable : 4127 )
#endif

#define UNUSED /*@unused@*/
#ifdef __GNUC__
#undef UNUSED
#define UNUSED __attribute__ ((unused)) /*@unused@*/
#endif

#ifndef INT16_MAX
#define INT16_MAX 32767
#endif
#ifndef INT16_MIN
#define INT16_MIN (-INT16_MAX - 1)
#endif

#if SHRT_MAX == INT16_MAX
typedef short int int16;
#elif INT_MAX == INT16_MAX
typedef int int16;
#else
#error failed to define int16, please report this to gary@pa.uky.edu
#endif

#ifndef UINT16_MAX
#define UINT16_MAX 65535
#endif

#if USHRT_MAX == UINT16_MAX
typedef unsigned short int uint16;
#elif UINT_MAX == UINT16_MAX
typedef unsigned int uint16;
#else
#error failed to define uint16, please report this to gary@pa.uky.edu
#endif

#ifndef INT32_MAX
#define INT32_MAX 2147483647L
#endif
#ifndef INT32_MIN
#define INT32_MIN (-INT32_MAX - 1)
#endif

#if INT_MAX == INT32_MAX
typedef int int32;
#elif LONG_MAX == INT32_MAX
typedef long int int32;
#else
#error failed to define int32, please report this to gary@pa.uky.edu
#endif

#ifndef UINT32_MAX
#define UINT32_MAX 4294967295UL
#endif

#if UINT_MAX == UINT32_MAX
typedef unsigned int uint32;
#elif ULONG_MAX == UINT32_MAX
typedef unsigned long int uint32;
#else
#error failed to define uint32, please report this to gary@pa.uky.edu
#endif

#if LONG_MAX > INT32_MAX

/* this will only be defined on LP64 systems
 * ILP32 systems may have long long support, but that is not
 * part of the ISO/ANSI standard, so we don't use it here... */

/* INT64_MAX, etc, may be defined as long long, so avoid system definitions! */

#undef INT64_MAX
#define INT64_MAX 9223372036854775807L

#undef INT64_MIN
#define INT64_MIN (-INT64_MAX - 1L)

#if LONG_MAX == INT64_MAX
#define HAVE_INT64 1
typedef long int int64;
#endif

#endif

#if ULONG_MAX > UINT32_MAX

#undef UINT64_MAX
#define UINT64_MAX 18446744073709551615UL

#if ULONG_MAX == UINT64_MAX
#define HAVE_UINT64 1
typedef unsigned long int uint64;
#endif

#endif

#ifdef cray
#ifndef __cray
#define __cray 1
#endif
#endif

#ifdef __x86_64
#ifndef __amd64
#define __amd64 1
#endif
#endif

#if defined(_ARCH_PPC) || defined(__POWERPC__) || defined(__powerpc__) || defined(PPC)
#ifndef __ppc__
#define __ppc__ 1
#endif
#endif

#if defined(unix) || defined(__unix__)
#ifndef __unix
#define __unix 1
#endif
#endif

#if defined(linux) || defined(__linux)
#ifndef __linux__
#define __linux__ 1
#endif
#endif

#ifdef __ECC
#ifndef __ICC
#define __ICC __ECC
#endif
#endif

#undef __GNUC_EXCL__
#if defined(__GNUC__) && ! ( defined(__ICC) || defined(__PATHSCALE__) || defined(__OPENCC__) || defined(__clang__) )
#define __GNUC_EXCL__ 1
#endif

/* make sure __func__ is defined, this can be removed once C++0x is in effect */
#ifndef HAVE_FUNC
#undef __func__
#define __func__ DEBUG_ENTRY.name()
#endif

/* safe, small, numbers for the float and double */
/*FLT_MAX is 3.40e38 on wintel, so BIGFLOAT is 3.40e36 */
UNUSED const realnum BIGFLOAT = numeric_limits<realnum>::max()/realnum(100.f);
const realnum SMALLFLOAT = numeric_limits<realnum>::min()*realnum(100.f);

const double BIGDOUBLE = DBL_MAX/100.;
const double SMALLDOUBLE = DBL_MIN*100.;

const int STDLEN = 32;

typedef enum { AS_DATA_ONLY_TRY, AS_DATA_LOCAL_TRY, AS_LOCAL_DATA_TRY, AS_LOCAL_ONLY_TRY, AS_DATA_ONLY, 
               AS_DATA_OPTIONAL, AS_DATA_LOCAL, AS_LOCAL_DATA, AS_LOCAL_ONLY, AS_SILENT_TRY } access_scheme;

// the C++ openmodes below give the exact equivalent of the C modes "r", "w", "a", etc.
// the "+" sign in the C mode has been replaced by "p", so, e.g., mode_rpb is equivalent to "r+b"
const ios_base::openmode mode_r = ios_base::in;
const ios_base::openmode mode_w = ios_base::out | ios_base::trunc;
const ios_base::openmode mode_a = ios_base::out | ios_base::app;
const ios_base::openmode mode_rp = ios_base::in | ios_base::out;
const ios_base::openmode mode_wp = ios_base::in | ios_base::out | ios_base::trunc;
const ios_base::openmode mode_ap = ios_base::in | ios_base::out | ios_base::app;

const ios_base::openmode UNUSED mode_rb = mode_r | ios_base::binary;
const ios_base::openmode UNUSED mode_wb = mode_w | ios_base::binary;
const ios_base::openmode UNUSED mode_ab = mode_a | ios_base::binary;
const ios_base::openmode UNUSED mode_rpb = mode_rp | ios_base::binary;
const ios_base::openmode UNUSED mode_wpb = mode_wp | ios_base::binary;
const ios_base::openmode UNUSED mode_apb = mode_ap | ios_base::binary;

FILE* open_data( const char* fname, const char* mode, access_scheme scheme=AS_DATA_ONLY );
void open_data( fstream& stream, const char* fname, ios_base::openmode mode, access_scheme scheme=AS_DATA_ONLY );

/* this class is deliberately kept global so that the constructor is executed before
 * any of the user code; this assures a correct FP environment right from the start */
class t_cpu_i
{
        union
        {
                char c[4];
                int32 i;
        } endian;

        sys_float test_float;
        double test_double;

        int32 Float_SNaN_Value;
#       ifdef HAVE_INT64
        int64 Double_SNaN_Value;
#       else
        int32 Double_SNaN_Value[2];
#       endif

#       ifdef __unix
        struct sigaction p_action;
        struct sigaction p_default;
#       endif

        bool p_lgAssertAbort;

        long n_avail_CPU;
        bool p_lgMPI;
        bool p_lgMPISingleRankMode;
        long n_rank;
        char HostName[STDLEN];
        vector<string> chSearchPath;
        char p_chDirSeparator;
        int nFileDone;

        void enable_traps() const;
        static void signal_handler(int sig);

        vector<string> p_exit_status;

        void getPathList( const char* fname, vector<string>& PathList, access_scheme scheme ) const;
public:
        t_cpu_i();

        bool big_endian() const { return ( endian.i == 0x12345678 ); }
        bool little_endian() const { return ( endian.i == 0x78563412 ); }

        sys_float min_float() const { return test_float; }
        double min_double() const { return test_double; }

#       ifdef __unix
        const struct sigaction* action() const { return &p_action; }
        const struct sigaction* deflt() const { return &p_default; }
#       endif

        void set_signal_handlers();

        void setAssertAbort(bool val)
        {
                p_lgAssertAbort = val;
#ifdef CATCH_SIGNAL
#               ifdef __unix
                if( val )
                        sigaction( SIGABRT, deflt(), NULL );
                else
                        sigaction( SIGABRT, action(), NULL );
#               endif
#               ifdef _MSC_VER
                if( val )
                        signal( SIGABRT, SIG_DFL );
                else
                        signal( SIGABRT, &signal_handler );
#               endif
#endif
        }
        bool lgAssertAbort() const { return p_lgAssertAbort; }

        void set_nCPU(long n) { n_avail_CPU = n; }
        long nCPU() const { return n_avail_CPU; }
        bool lgMPI() const { return p_lgMPI; }
        void set_MPISingleRankMode( bool mode ) { p_lgMPISingleRankMode = mode; }
        bool lgMPISingleRankMode() const { return p_lgMPISingleRankMode; }
        void set_nRANK(long n) { n_rank = n; }
        long nRANK() const { return n_rank; }
        bool lgMaster() const { return ( n_rank == 0 ); }
        bool lgMPI_talk() const { return lgMaster() || lgMPISingleRankMode(); }
        const char *host_name() const { return HostName; }
        void printDataPath() const;
        char chDirSeparator() const { return p_chDirSeparator; }
        bool firstOpen() const { return ( nFileDone == 0 ); }
        const string& chExitStatus(exit_type s) const { return p_exit_status[s]; }

        friend FILE* open_data( const char* fname, const char* mode, access_scheme scheme );
        friend void open_data( fstream& stream, const char* fname, ios_base::openmode mode, access_scheme scheme );

        friend void set_NaN(sys_float &x);
        friend void set_NaN(sys_float x[], long n);
        friend void set_NaN(double &x);
        friend void set_NaN(double x[], long n);
};
class t_cpu
{
        static t_cpu_i *m_i;
public:
        t_cpu_i &i()
        {
                return *m_i;
        }
        t_cpu();
        ~t_cpu();
};
// Generate a (static) instance of this variable in *every* file.
static t_cpu cpu;

// The static (class) pointer is set in the first of these.  Obviously 
// this is not thread safe...

// Better engineered variants are available in Alexandrescu's book; 
// better yet to reduce the number of globals and file-statics so 
// this can just be initialized at the start of main().

void set_NaN(sys_float &x);
void set_NaN(sys_float x[], /* x[n] */
             long n);
void set_NaN(double &x);
void set_NaN(double x[], /* x[n] */
             long n);

bool MyIsnan(const sys_float &x);
bool MyIsnan(const double &x);

/* Apply compiler directive saying that current routine does not
         return as modifier, as in "NORETURN void MyExit() { ... }"  */
#ifdef _MSC_VER
#define NORETURN __declspec(noreturn) /*@noreturn@*/
#elif defined(__GNUC__) || ( defined(__INTEL_COMPILER) && defined(__linux__) )
#define NORETURN  __attribute__ ((noreturn)) /*@noreturn@*/
#else
#define NORETURN /*@noreturn@*/
#endif

#define RESTRICT
#define UNLIKELY(x) (x)
#ifdef __GNUC__
#if (__GNUC__ >= 3)
#undef UNLIKELY
#define UNLIKELY(x) __builtin_expect((x),0)
#endif
#undef RESTRICT
#define RESTRICT __restrict
#else
#endif

/* Some hackery needed to test if a preprocessor macro is empty. Use as follows:
 *  #if EXPAND(SOME_DODGY_MACRO) == 1
 *      get here if SOME_DODGY_MACRO expands to empty string
 *  #endif */
#define DO_EXPAND(VAL)  VAL ## 1
#define EXPAND(VAL)     DO_EXPAND(VAL)

/* Define __COMP and __COMP_VER macros for all systems */
/* the Intel compiler */
/* this needs to be before g++ since icc also sets __GNUC__ */
#if defined __INTEL_COMPILER
#       define  __COMP  "icc"
#       define  __COMP_VER      __INTEL_COMPILER 

/* PathScale EKOPath compiler */
/* this needs to be before g++ since pathCC also sets __GNUC__ */
#elif defined __PATHSCALE__
#       define  __COMP  "pathCC"
#       define  __COMP_VER      __PATHCC__ * 100 + __PATHCC_MINOR__ * 10 + __PATHCC_PATCHLEVEL__

/* Open64 compiler */
/* this needs to be before g++ since openCC also sets __GNUC__ */
#elif defined __OPENCC__
#       define  __COMP  "Open64"
#       if EXPAND(__OPENCC_PATCHLEVEL__) == 1
#               define  __COMP_VER      __OPENCC__ * 100 + __OPENCC_MINOR__ * 10
#       else
#               define  __COMP_VER      __OPENCC__ * 100 + __OPENCC_MINOR__ * 10 + __OPENCC_PATCHLEVEL__
#       endif

/* LLVM clang++ */
/* this needs to be before g++ since clang++ also sets __GNUC__ */
#elif defined __clang__
#       define  __COMP  "clang++"
#       define  __COMP_VER      __clang_major__ * 100 + __clang_minor__ * 10 + __clang_patchlevel__

/* g++ */
#elif defined __GNUC__
#       define  __COMP  "g++"
#       if defined(__GNUC_PATCHLEVEL__)
#               define __COMP_VER (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
#       else
#               define __COMP_VER (__GNUC__ * 10000 + __GNUC_MINOR__ * 100)
#       endif

#elif defined __PGI
#       define  __COMP  "Portland Group"
#       if defined(__PGIC__)
#               define __COMP_VER (__PGIC__ * 100 + __PGIC_MINOR__ * 10 + __PGIC_PATCHLEVEL__)
#       else
#               define __COMP_VER 0
#       endif

/* SGI MIPSpro */
/* this needs to be after g++, since g++ under IRIX also sets _COMPILER_VERSION */
#elif defined(__sgi) && defined(_COMPILER_VERSION)
#       define  __COMP  "MIPSpro"
#       define  __COMP_VER      _COMPILER_VERSION

/* HP */
#elif defined __HP_aCC 
#       define  __COMP  "HP aCC"
#       define  __COMP_VER      __HP_aCC  

/* DEC - this one may be broken for C++, no way to test it... */
#elif defined __DECC 
#       define  __COMP  "DEC CC"
#       define  __COMP_VER      __DECC_VER   

/* MS VS */
#elif defined   _MSC_VER
#       define  __COMP  "vs"
#       define  __COMP_VER      _MSC_VER  

/* Oracle Solaris Studio */
#elif defined   __SUNPRO_CC
#       define  __COMP  "Solaris Studio"
#       define  __COMP_VER      __SUNPRO_CC

/* unknown */
#else
#       define  __COMP  "unknown"
#       define  __COMP_VER      0 
#endif

/* ----------------------------  OS ---------------------------- */
/* linux */
#if defined     __linux__
#       if defined __i386
#               define  __OS    "Linux (IA32)"
#       elif defined __amd64
#               define  __OS    "Linux (AMD64)"
#       elif defined __ia64
#               define  __OS    "Linux (IA64)"
#       elif defined __ppc__
#               define  __OS    "Linux (PowerPC)"
#       else
#               define  __OS    "Linux (other)"
#       endif

/* macintosh */
#elif defined   macintosh
#       define  __OS    "Mac OS 9"

/* macintosh */
#elif defined   __MACOSX__
#       define  __OS    "Mac OS X"

/* apple mac, ... */
#elif defined   __APPLE__
#       define  __OS    "Apple MacOS"

/* HP */
#elif defined   hpux
#       define  __OS    "HP-UX"

/* Oracle Solaris */
#elif defined   __sun
#       define  __OS    "Solaris"

/* IBM AIX */
#elif defined   _AIX
#       define  __OS    "AIX"

/* Compaq alpha */
#elif defined   ultrix
#       define  __OS    "Ultrix"

/* the BSD variants */
#elif defined   __FreeBSD__
#       define  __OS    "FreeBSD"

#elif defined   __NetBSD__
#       define  __OS    "NetBSD"

#elif defined   __OpenBSD__
#       define  __OS    "OpenBSD"

/* Windows64 */
/* this needs to be before _WIN32 since Windows64 also sets _WIN32 */
#elif defined   _WIN64
#       define  __OS    "Win64"

/* Windows */
#elif defined   _WIN32
#       define  __OS    "Win32"

/* Cygwin */
#elif defined   __CYGWIN__
#       define  __OS    "Cygwin"

/* SGI */
#elif defined   __sgi
#       define  __OS    "IRIX"

/* unknown */
#else
#       define  __OS    "unknown"
#endif

/* don't perform this check when we are generating dependencies */
#ifndef MM
/* bomb out if the compiler is broken.... */
#  if defined(__GNUC_EXCL__) && ((__GNUC__ == 2 && __GNUC_MINOR__ == 96) || (__GNUC__ == 3 && __GNUC_MINOR__ == 4))
#  error "This g++ version cannot compile Cloudy and must not be used! Please update g++ to a functional version. See http://wiki.nublado.org/wiki/CompilingCloudyC13 for more details."
#  endif

#  if __INTEL_COMPILER >= 1200 &&  __INTEL_COMPILER < 1300
#  error "This icc version cannot compile Cloudy and must not be used! Please use a functional version of icc, or g++. See http://wiki.nublado.org/wiki/CompilingCloudyC13 for more details."
#  endif
#endif

#ifdef _MSC_VER
#pragma warning( default : 4127 )/* disable warning that conditional expression is constant*/
#endif

#endif /* CPU_H_ */