//
// 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 : Thu Nov 21 16:31:39 2019
// Update Count     : 101
//

// 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(dtype T)
struct __Destructor {
	T * object;
	void (*dtor)(T *);
};

// defined destructor in the case that non-generated code wants to use __Destructor
forall(dtype T)
static 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(dtype T)
	static inline void __destroy_Destructor(__Destructor(T) * dtor) {
		^(*dtor){};
	}
}

// exception implementation

typedef unsigned long long __cfaabi_abi_exception_type_t;

#include <limits.h>										// CHAR_BIT
#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(dtype T)
static inline T & identity(T & i) {
	return i;
}

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

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

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

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

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

static inline {
	forall( dtype DT | { DT & ?+=?( DT &, one_t ); } )
	DT & ++?( DT & x ) { return x += 1; }

	forall( dtype DT | sized(DT) | { void ?{}( DT &, DT ); void ^?{}( DT & ); DT & ?+=?( DT &, one_t ); } )
	DT & ?++( DT & x ) { DT tmp = x; x += 1; return tmp; }

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

	forall( dtype DT | sized(DT) | { void ?{}( DT &, DT ); void ^?{}( DT & ); DT & ?-=?( DT &, one_t ); } )
	DT & ?--( DT & x ) { DT tmp = x; x -= 1; return tmp; }

	forall( dtype DT | { int ?!=?( const DT &, zero_t ); } )
	int !?( const DT & x ) { return !( x != 0 ); }
} // distribution

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

// 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"

static 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

#define __CFA_BASE_COMP_1__() if ( ep == 1 ) return 1
#define __CFA_BASE_COMP_2__() if ( ep == 2 ) return ep << (y - 1)
#define __CFA_EXP_OVERFLOW__() if ( y >= sizeof(y) * CHAR_BIT ) return 0

#define __CFA_EXP__() \
	if ( y == 0 ) return 1;								/* convention */ \
	__CFA_BASE_COMP_1__();								/* base case */ \
	__CFA_BASE_COMP_2__();								/* special case, positive shifting for integral types */ \
	__CFA_EXP_OVERFLOW__();								/* immediate overflow, negative exponent > 2^size-1 */ \
	typeof(ep) op = 1;									/* accumulate odd product */ \
	for ( ; y > 1; y >>= 1 ) {							/* squaring exponentiation, O(log2 y) */ \
		if ( (y & 1) == 1 ) op = op * ep;				/* odd ? */ \
		ep = ep * ep; \
	} \
	return ep * op

static inline {
	long int ?\?( int ep, unsigned int y ) { __CFA_EXP__(); }
	long int ?\?( long int ep, unsigned long int y ) { __CFA_EXP__(); }
	// unsigned computation may be faster and larger
	unsigned long int ?\?( unsigned int ep, unsigned int y ) { __CFA_EXP__(); }
	unsigned long int ?\?( unsigned long int ep, unsigned long int y ) { __CFA_EXP__(); }
} // distribution

#undef __CFA_BASE_COMP_1__
#undef __CFA_BASE_COMP_2__
#undef __CFA_EXP_OVERFLOW__
#define __CFA_BASE_COMP_1__()
#define __CFA_BASE_COMP_2__()
#define __CFA_EXP_OVERFLOW__()

static inline forall( otype OT | { void ?{}( OT & this, one_t ); OT ?*?( OT, OT ); } ) {
	OT ?\?( OT ep, unsigned int y ) { __CFA_EXP__(); }
	OT ?\?( OT ep, unsigned long int y ) { __CFA_EXP__(); }
} // distribution

#undef __CFA_BASE_COMP_1__
#undef __CFA_BASE_COMP_2__
#undef __CFA_EXP_OVERFLOW__

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

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