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# Crown Copyright (c) 1997
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#
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# This TenDRA(r) Computer Program is subject to Copyright
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# owned by the United Kingdom Secretary of State for Defence
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# acting through the Defence Evaluation and Research Agency
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# (DERA). It is made available to Recipients with a
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# royalty-free licence for its use, reproduction, transfer
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# to other parties and amendment for any purpose not excluding
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# product development provided that any such use et cetera
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# shall be deemed to be acceptance of the following conditions:-
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#
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# (1) Its Recipients shall ensure that this Notice is
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# reproduced upon any copies or amended versions of it;
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#
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# (2) Any amended version of it shall be clearly marked to
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# show both the nature of and the organisation responsible
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# for the relevant amendment or amendments;
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#
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# (3) Its onward transfer from a recipient to another
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# party shall be deemed to be that party's acceptance of
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# these conditions;
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#
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# (4) DERA gives no warranty or assurance as to its
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# quality or suitability for any purpose and DERA accepts
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# no liability whatsoever in relation to any use to which
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# it may be put.
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#
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#
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# TOKEN DECLARATIONS
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#
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# The following standard C tokens are declared.
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#
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( make_tokdec ~char variety )
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( make_tokdec ~signed_int variety )
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#
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# OFFSET TO INTEGER CONVERSIONS
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#
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# These tokens are used to convert offsets to and from integers. The
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# latter uses an offset cast to prevent the rounding which would occur
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# from a more natural offset_pad expression - the C++ type rules ensure
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# correctness.
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#
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( make_tokdef ~cpp.offset.div
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( exp a ) exp
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( offset_div ~signed_int
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( offset_subtract
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( offset_pad ( alignment ( integer ~char ) ) a )
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( offset_zero ( alignment ( integer ~char ) ) ) )
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( offset_pad
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( alignment ( integer ~char ) )
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( shape_offset ( integer ~char ) ) ) ) )
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( make_tokdef ~cpp.offset.cast
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( alignment s exp a ) exp
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( component
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( offset s s )
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( make_compound
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( offset_max
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( shape_offset
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( offset
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( alignment ( integer ~char ) )
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( alignment ( integer ~char ) ) ) )
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( shape_offset
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( offset s s ) ) )
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( offset_zero
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( alignment
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( offset
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( alignment ( integer ~char ) )
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( alignment ( integer ~char ) ) ) ) )
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a )
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( offset_zero ( alignment ( offset s s ) ) ) ) )
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( make_tokdef ~cpp.offset.mult
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( alignment s exp a ) exp
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( ~cpp.offset.cast
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s
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( offset_mult
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( offset_pad
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( alignment ( integer ~char ) )
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( shape_offset ( integer ~char ) ) )
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a ) ) )
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#
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# NULL POINTER TO DATA MEMBER
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#
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# This token gives the null pointer to data member.
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#
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( make_tokdef ~cpp.pm.null
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exp
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( make_int ~signed_int 0 ) )
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#
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# CONSTRUCT A POINTER TO DATA MEMBER
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#
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# This token constructs a pointer to data member from the offset
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# expression a. Note that 1 is added to allow for null pointers to
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# members.
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#
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( make_tokdef ~cpp.pm.make
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( exp a ) exp
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( plus wrap
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( ~cpp.offset.div a )
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( make_int ~signed_int 1 ) ) )
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#
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# DECONSTRUCT A POINTER TO DATA MEMBER
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#
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# This token turns the pointer to data member expression a into an offset
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# for a shape of alignment s. The result is undefined if a is the null
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# pointer to member, otherwise 1 needs to be subtracted from a.
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#
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( make_tokdef ~cpp.pm.offset
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( exp a alignment s ) exp
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( ~cpp.offset.mult
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s
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( minus wrap a ( make_int ~signed_int 1 ) ) ) )
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#
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# POINTER TO DATA MEMBER TEST
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#
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# These tokens are used to compare the pointer to data member expressions
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# a and b and to compare a against the null pointer to member.
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#
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( make_tokdef ~cpp.pm.compare
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( exp a exp b label lab ntest n ) exp
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( integer_test n lab a b ) )
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( make_tokdef ~cpp.pm.test
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( exp a label lab ntest n ) exp
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( integer_test n lab a ( make_int ~signed_int 0 ) ) )
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#
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# POINTER TO DATA MEMBER CAST
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#
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# These tokens cast a non-null pointer to data member a by adding or
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# subtracting the base class offset b.
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#
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( make_tokdef ~cpp.pm.cast
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( exp a exp b ) exp
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( plus wrap a ( ~cpp.offset.div b ) ) )
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( make_tokdef ~cpp.pm.uncast
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( exp a exp b ) exp
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( minus wrap a ( ~cpp.offset.div b ) ) )
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