source: libcfa/prelude/builtins.c@ 0d6fd21

//
// Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// builtins.c --
//
// Author           : Peter A. Buhr
// Created On       : Fri Jul 21 16:21:03 2017
// Last Modified By : Peter A. Buhr
// Last Modified On : Wed May 21 18:40:14 2025
// Update Count     : 151
//

#define __cforall_builtins__

// Type that wraps a pointer and a destructor-like function - used in generating implicit destructor calls for struct
// members in user-defined functions. Note: needs to occur early, because it is used to generate destructor calls during
// code generation
forall( T & )
struct __Destructor {
        T * object;
        void (*dtor)( T * );
};

// Defined destructor in the case that non-generated code wants to use __Destructor.
forall( T & )
inline void ^?{}( __Destructor(T) & x ) {
        if ( x.object && x.dtor ) {
                x.dtor( x.object );
        }
}

// Easy interface into __Destructor's destructor for easy codegen purposes.
extern "C" {
        forall( T & )
        static inline void __destroy_Destructor( __Destructor(T) * dtor ) {
                ^(*dtor){};
        }
}

// exception implementation

typedef unsigned long long __cfaabi_abi_exception_type_t;

#include "../src/virtual.h"
#include "../src/exception.h"

void exit( int status, const char fmt[], ... ) __attribute__ (( format( printf, 2, 3 ), __nothrow__, __leaf__, __noreturn__ ));
void abort( const char fmt[], ... ) __attribute__ (( format( printf, 1, 2 ), __nothrow__, __leaf__, __noreturn__ ));

forall( T & )
inline T & identity( T & i ) {
        return i;
}

// generator support
struct generator$ {
        inline int;
};

inline void  ?{}( generator$ & this ) { ((int &)this) = 0; }
inline void ^?{}( generator$ & ) {}

forall( T & )
trait is_generator {
        void main( T & this );
        generator$ * get_generator( T & this );
};

forall( T & | is_generator( T ) )
inline T & resume( T & gen ) {
        main( gen );
        return gen;
}

// Nearly "otype," except no parameterless constructor.
// All you need, to store values in variables and to pass and return by value.
// Many cases of
//     forall( T ...
// can be "simplified" to
//     forall( T & | is_value(T) ...
forall( T * )
trait is_value {
        void ?{}( T &, T );
        T ?=?( T &, T );
        void ^?{}( T & );
};

// implicit increment, decrement if += defined, and implicit not if != defined

// C11 reference manual Section 6.5.16 (page 101): "An assignment expression has the value of the left operand after the
// assignment, but is not an lvalue." Hence, return a value not a reference.
inline {
        forall( T & | is_value(T) | { T ?+=?( T &, one_t ); } )
        T ++?( T & x ) { return x += 1; }

        forall( T & | is_value(T) | { T ?+=?( T &, one_t ); } )
        T ?++( T & x ) { T tmp = x; x += 1; return tmp; }

        forall( T & | is_value(T) | { T ?-=?( T &, one_t ); } )
        T --?( T & x ) { return x -= 1; }

        forall( T & | is_value(T) | { T ?-=?( T &, one_t ); } )
        T ?--( T & x ) { T tmp = x; x -= 1; return tmp; }

        forall( T & | is_value(T) | { int ?!=?( T, zero_t ); } )
        int !?( T & x ) { return !( x != 0 ); }
} // distribution

// universal typed pointer constant
static inline forall( DT & ) DT * intptr( uintptr_t addr ) { return (DT *)addr; }
static inline forall( ftype FT ) FT * intptr( uintptr_t addr ) { return (FT *)addr; }

#if defined(__SIZEOF_INT128__)
// constructor for 128-bit numbers (all constants are unsigned as +/- are operators)
inline void ?{}( unsigned int128 & this, unsigned long int h, unsigned long int l ) {
        this = (unsigned int128)h << 64 | (unsigned int128)l;
} // ?{}
#endif // __SIZEOF_INT128__


// exponentiation operator implementation

extern "C" {
        float powf( float x, float y );
        double pow( double x, double y );
        long double powl( long double x, long double y );
        float _Complex cpowf( float _Complex x, _Complex float z );
        double _Complex cpow( double _Complex x, _Complex double z );
        long double _Complex cpowl( long double _Complex x, _Complex long double z );
} // extern "C"

inline {
        float ?\?( float x, float y ) { return powf( x, y ); }
        double ?\?( double x, double y ) { return pow( x, y ); }
        long double ?\?( long double x, long double y ) { return powl( x, y ); }
        float _Complex ?\?( float _Complex x, _Complex float y ) { return cpowf( x, y ); }
        double _Complex ?\?( double _Complex x, _Complex double y ) { return cpow( x, y ); }
        long double _Complex ?\?( long double _Complex x, _Complex long double y ) { return cpowl( x, y ); }
} // distribution

int ?\?( int x, unsigned int y );
long int ?\?( long int x, unsigned long int y );
long long int ?\?( long long int x, unsigned long long int y );
// unsigned computation may be faster and larger
unsigned int ?\?( unsigned int x, unsigned int y );
unsigned long int ?\?( unsigned long int x, unsigned long int y );
unsigned long long int ?\?( unsigned long long int x, unsigned long long int y );

forall( OT | { void ?{}( OT & this, one_t ); OT ?*?( OT, OT ); } ) {
        OT ?\?( OT x, unsigned int y );
        OT ?\?( OT x, unsigned long int y );
        OT ?\?( OT x, unsigned long long int y );
} // distribution

inline {
        int ?\=?( int & x, unsigned int y ) { x = x \ y; return x; }
        long int ?\=?( long int & x, unsigned long int y ) { x = x \ y; return x; }
        long long int ?\=?( long long int & x, unsigned long long int y ) { x = x \ y; return x; }
        unsigned int ?\=?( unsigned int & x, unsigned int y ) { x = x \ y; return x; }
        unsigned long int ?\=?( unsigned long int & x, unsigned long int y ) { x = x \ y; return x; }
        unsigned long long int ?\=?( unsigned long long int & x, unsigned long long int y ) { x = x \ y; return x; }
} // distribution


// enumeration implementation

forall( E ) trait Bounded {
        E lowerBound( void );
        E upperBound( void );
};

forall( E | Bounded( E ) ) trait Serial {
        int fromInstance( E e );
        E fromInt_unsafe( int i );
        E succ_unsafe( E e );
        E pred_unsafe( E e );
};

forall( E ) trait CfaEnum {
        const char * label( E e );
        int posn( E e );
};

forall( E, V | CfaEnum( E ) ) trait TypedEnum {
        V value( E e );
};

inline forall( E | Serial( E ) ) {
        E fromInt( int i ) {
                E upper = upperBound();
                E lower = lowerBound();
                // It is okay to overflow as overflow will be theoretically caught by the other bound
                if ( i < fromInstance( lower ) || i > fromInstance( upper ) )
                        abort( "call to fromInt has index %d outside of enumeration range %d-%d.",
                                   i, fromInstance( lower ), fromInstance( upper ) );
                return fromInt_unsafe( i );
        }

        E succ( E e ) {
                E upper = upperBound();
                if ( fromInstance( e ) >= fromInstance( upper ) )
                        abort( "call to succ() exceeds enumeration upper bound of %d.", fromInstance( upper ) );
                return succ_unsafe( e );
        }

        E pred( E e ) {
                E lower = lowerBound();
                if ( fromInstance( e ) <= fromInstance( lower ) )
                        abort( "call to pred() exceeds enumeration lower bound of %d.", fromInstance( lower ) );
                return pred_unsafe( e );
        }

        int Countof( E ) {
                E upper = upperBound();
                E lower = lowerBound();
                return fromInstance( upper ) + fromInstance( lower ) + 1;
        }
}

inline forall( E | CfaEnum( E ) ) {
        int ?==?( E l, E r ) { return posn( l ) == posn( r ); }
        int ?!=?( E l, E r ) { return posn( l ) != posn( r ); }
        int ?<?( E l, E r ) { return posn( l ) < posn( r ); }
        int ?<=?( E l, E r ) { return posn( l ) <= posn( r ); }
        int ?>?( E l, E r ) { return posn( l ) > posn( r ); }
        int ?>=?( E l, E r ) { return posn( l ) >= posn( r ); }
}

inline forall( E | Serial( E ) ) {
        E ?+=?( E & l, one_t ) {
                int pos = fromInstance( l );
                l = fromInt_unsafe( pos + 1 );
                return l;
        }

        E ?-=?( E & l, one_t ) {
                int pos = fromInstance( l );
                l = fromInt_unsafe( pos - 1 );
                return l;
        }

        E ?+=?( E & l, int i ) {
                int pos = fromInstance( l );
                l = fromInt_unsafe( pos + i );
                return l;
        }

        E ?-=?( E & l, int i ) {
                int pos = fromInstance( l );
                l = fromInt_unsafe( pos - i );
                return l;
        }
}

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