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184 lines
7.0 KiB
C
184 lines
7.0 KiB
C
/* Copyright (C) 2002
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* Housemarque Oy
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* http://www.housemarque.com
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*
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* Permission to copy, use, modify, sell and distribute this software is
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* granted provided this copyright notice appears in all copies. This
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* software is provided "as is" without express or implied warranty, and
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* with no claim as to its suitability for any purpose.
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*
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* See http://www.boost.org for most recent version.
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*/
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/* This example implements a couple of 1-dimensional arithmetic array
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* manipulation functions in C. The idea is to use preprocessor data
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* structures, lists and tuples, for storing meta information to be used
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* for generating the actual C code.
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*
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* Compile with gcc. It will take a while!
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*/
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#include <libs/preprocessor/example/array_arithmetic_helpers.hpp>
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#include <boost/preprocessor/list/at.hpp>
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#include <boost/preprocessor/list/append.hpp>
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#include <boost/preprocessor/tuple/to_list.hpp>
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#include <boost/preprocessor/tuple/eat.hpp>
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#include <boost/preprocessor/comparison/less.hpp>
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#include <boost/preprocessor/comparison/equal.hpp>
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#include <boost/preprocessor/comparison/not_equal.hpp>
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#include <boost/preprocessor/logical/or.hpp>
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#include <boost/preprocessor/logical/and.hpp>
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#include <boost/preprocessor/arithmetic/mul.hpp>
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#include <boost/preprocessor/arithmetic/add.hpp>
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#include <stddef.h>
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/* ** Information about C operators for preprocessor metaprogramming. ** */
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/* Accessors for the operator datatype. */
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#define OP_SYMBOL(O) BOOST_PP_TUPLE7_ELEM0 O
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#define OP_NAME(O) BOOST_PP_TUPLE7_ELEM1 O
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#define OP_IS_BINARY(O) BOOST_PP_TUPLE7_ELEM2 O
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#define OP_IS_FLOATING(O) BOOST_PP_TUPLE7_ELEM3 O
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#define OP_IS_LOGICAL(O) BOOST_PP_TUPLE7_ELEM4 O
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#define OP_IS_SHIFT(O) BOOST_PP_TUPLE7_ELEM5 O
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#define OP_IS_COMMUTATIVE(O) BOOST_PP_TUPLE7_ELEM6 O
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/* List of applicative unary operators. */
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#define APPLICATIVE_UNARY_OPS\
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BOOST_PP_TUPLE_TO_LIST\
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( 3\
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, ( ( ! , logical_not , 0 , 1 , 1 , 0 , 0 )\
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, ( ~ , bitwise_not , 0 , 0 , 0 , 0 , 0 )\
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, ( - , neg , 0 , 1 , 0 , 0 , 0 )\
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)\
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)
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/* List of applicative binary operators. */
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#define APPLICATIVE_BINARY_OPS\
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BOOST_PP_LIST_APPEND\
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( BOOST_PP_TUPLE_TO_LIST\
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( 2\
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, ( ( * , mul , 1 , 1 , 0 , 0 , 1 )\
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, ( / , div , 1 , 1 , 0 , 0 , 0 )\
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)\
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)\
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, BOOST_PP_TUPLE_TO_LIST\
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( 16\
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, ( ( % , mod , 1 , 0 , 0 , 0 , 0 )\
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, ( + , add , 1 , 1 , 0 , 0 , 1 )\
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, ( - , sub , 1 , 1 , 0 , 0 , 0 )\
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, ( << , shift_left , 1 , 0 , 0 , 1 , 0 )\
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, ( >> , shift_right , 1 , 0 , 0 , 1 , 0 )\
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, ( < , less , 1 , 1 , 1 , 0 , 0 )\
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, ( <= , less_equal , 1 , 1 , 1 , 0 , 0 )\
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, ( >= , greater_equal , 1 , 1 , 1 , 0 , 0 )\
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, ( > , greater , 1 , 1 , 1 , 0 , 0 )\
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, ( == , equal , 1 , 1 , 1 , 0 , 1 )\
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, ( != , not_equal , 1 , 1 , 1 , 0 , 1 )\
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, ( & , bitwise_and , 1 , 0 , 0 , 0 , 1 )\
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, ( | , bitwise_or , 1 , 0 , 0 , 0 , 1 )\
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, ( ^ , bitwise_xor , 1 , 0 , 0 , 0 , 1 )\
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, ( && , logical_and , 1 , 1 , 1 , 0 , 1 )\
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, ( || , logical_or , 1 , 1 , 1 , 0 , 1 )\
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)\
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)\
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)
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/* ** Information about C built-in types for preprocessor metaprogramming. ** */
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/* Accessors for the type datatype. */
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#define TYPE_NAME(T) BOOST_PP_TUPLE6_ELEM0 T
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#define TYPE_ABBREVIATION(T) BOOST_PP_TUPLE6_ELEM1 T
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#define TYPE_IS_FLOATING(T) BOOST_PP_TUPLE6_ELEM2 T
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#define TYPE_IS_LONG(T) BOOST_PP_TUPLE6_ELEM3 T
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#define TYPE_IS_UNSIGNED(T) BOOST_PP_TUPLE6_ELEM4 T
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#define TYPE_SIZE(T) BOOST_PP_TUPLE6_ELEM5 T
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/* List of C built-in types.
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*
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* Some of the information is platform dependent, but this example
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* does not take that into consideration.
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*/
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#define BUILTIN_TYPES\
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BOOST_PP_TUPLE_TO_LIST\
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( 12\
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, ( ( signed char , sc , 0 , 0 , 0 , 1 )\
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, ( char , ch , 0 , 0 , 0 , 1 )\
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, ( unsigned char , uc , 0 , 0 , 1 , 1 )\
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, ( short , ss , 0 , 0 , 0 , 2 )\
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, ( unsigned short , us , 0 , 0 , 1 , 2 )\
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, TYPE_INT\
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, ( unsigned int , ui , 0 , 0 , 1 , 4 )\
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, ( long , sl , 0 , 1 , 0 , 4 )\
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, ( unsigned long , ul , 0 , 1 , 1 , 4 )\
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, ( float , fl , 1 , 0 , 0 , 4 )\
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, ( double , db , 1 , 0 , 0 , 8 )\
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, ( long double , ld , 1 , 1 , 0 , 8 )\
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)\
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)
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/* Type int is needed in some type operations. */
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#define TYPE_INT ( int , si , 0 , 0 , 0 , 4 )
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/* Computes the rank of the type for:
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* - integer promotions, and
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* - usual arithmetic conversions.
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*/
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#define TYPE_RANK(T)\
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BOOST_PP_ADD\
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( BOOST_PP_ADD\
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( BOOST_PP_ADD\
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( BOOST_PP_MUL(64,TYPE_IS_FLOATING(T))\
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, BOOST_PP_MUL(32,TYPE_IS_LONG(T))\
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)\
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, BOOST_PP_MUL(TYPE_SIZE(T),2)\
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)\
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, TYPE_IS_UNSIGNED(T)\
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)
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#define TYPE_IS_SAME(L,R) BOOST_PP_EQUAL(TYPE_RANK(L),TYPE_RANK(R))
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/* Compute the type of the result of an integral promotion. */
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#define INTEGER_PROMOTION(T) BOOST_PP_IF(BOOST_PP_LESS(TYPE_RANK(T),TYPE_RANK(TYPE_INT)),TYPE_INT,T)
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/* Computes the type of the result of an usual arithmetic conversion. */
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#define USUAL_ARITHMETIC_CONVERSION(L,R) INTEGER_PROMOTION(BOOST_PP_IF(BOOST_PP_LESS(TYPE_RANK(L),TYPE_RANK(R)),R,L))
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/* Computes the type of applying a unary operator. */
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#define UNARY_OP_RESULT(O,T) BOOST_PP_IF(OP_IS_LOGICAL(O),TYPE_INT,INTEGER_PROMOTION(T))
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/* Computes the type of applying a binary operator. */
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#define BINARY_OP_RESULT(O,L,R) BOOST_PP_IF(OP_IS_LOGICAL(O),TYPE_INT,BOOST_PP_IF(OP_IS_SHIFT(O),INTEGER_PROMOTION(L),USUAL_ARITHMETIC_CONVERSION(L,R)))
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/* Generates code for all all unary operators and integral types. */
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#define UNARY_ARRAY_OP(_,L)\
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UNARY_ARRAY_OP2(BOOST_PP_LIST_AT(L,1),BOOST_PP_LIST_AT(L,0))
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#define UNARY_ARRAY_OP2(O,T)\
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BOOST_PP_IF\
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( BOOST_PP_NOT_EQUAL(BOOST_PP_ADD(BOOST_PP_MUL(2,TYPE_IS_FLOATING(T)),OP_IS_FLOATING(O)),2)\
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, UNARY_ARRAY_OP3\
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, BOOST_PP_TUPLE_EAT(2)\
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)(O,T)
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#define UNARY_ARRAY_OP3(O,T)\
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void BOOST_PP_CAT4(array_,OP_NAME(O),_,TYPE_ABBREVIATION(T))\
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(const TYPE_NAME(T)* in, TYPE_NAME(UNARY_OP_RESULT(O,T))* out, size_t n)\
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{ do { *out++ = OP_SYMBOL(O) *in++; } while (--n); }
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BOOST_PP_LIST_FOR_EACH_PRODUCT(UNARY_ARRAY_OP,_,BOOST_PP_TUPLE_TO_LIST(2,(APPLICATIVE_UNARY_OPS,BUILTIN_TYPES)))
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/* Generates code for all binary operators and integral type pairs. */
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#define BINARY_ARRAY_OP(_,L)\
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BINARY_ARRAY_OP2(BOOST_PP_LIST_AT(L,2),BOOST_PP_LIST_AT(L,1),BOOST_PP_LIST_AT(L,0))
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#define BINARY_ARRAY_OP2(O,L,R)\
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BOOST_PP_IF\
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( BOOST_PP_NOT_EQUAL(BOOST_PP_ADD(BOOST_PP_MUL(2,BOOST_PP_OR(TYPE_IS_FLOATING(L),TYPE_IS_FLOATING(R))),OP_IS_FLOATING(O)),2)\
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, BINARY_ARRAY_OP3\
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, BOOST_PP_TUPLE_EAT(3)\
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)(O,L,R)
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#define BINARY_ARRAY_OP3(O,L,R)\
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void BOOST_PP_CAT6(array_,OP_NAME(O),_,TYPE_ABBREVIATION(L),_,TYPE_ABBREVIATION(R))\
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(const TYPE_NAME(L)* lhs_in, const TYPE_NAME(R)* rhs_in, TYPE_NAME(BINARY_OP_RESULT(O,L,R))* out, size_t n)\
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{ do { *out++ = *lhs_in++ OP_SYMBOL(O) *rhs_in++; } while (--n); }
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BOOST_PP_LIST_FOR_EACH_PRODUCT(BINARY_ARRAY_OP,_,BOOST_PP_TUPLE_TO_LIST(3,(APPLICATIVE_BINARY_OPS,BUILTIN_TYPES,BUILTIN_TYPES)))
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