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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 tokens are declared.
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#
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( make_tokdec ~comp_off ( exp ) exp )
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( make_tokdec ~cpp.pmf.type shape )
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( make_tokdec ~cpp.typeid.type shape )
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( make_tokdec ~cpp.offset.div ( exp ) exp )
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( make_tokdec ~cpp.vtab.diag shape )
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( make_tokdec ~signed_short variety )
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( make_tokdec ~signed_int variety )
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( make_id_tagdec __TCPPLUS_pure proc )
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#
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# VIRTUAL FUNCTION TABLE TYPE DEFINITION
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#
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# These tokens describe the type representing a virtual function table.
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# This is basically the same as the type VTABLE defined in implement.h but
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# the size of the table, n, is provided as a token argument.
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#
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( local make_tokdef extra.rtti
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exp
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( offset_zero ( alignment ( pointer ( alignment top ) ) ) ) )
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( local make_tokdef extra.off
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exp
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( offset_pad
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( alignment ( integer ~signed_short ) )
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( offset_add
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extra.rtti
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( shape_offset
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( pointer ( alignment ~cpp.typeid.type ) ) ) ) ) )
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( local make_tokdef extra
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shape
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( compound
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( ~comp_off
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( offset_add
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extra.off
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( shape_offset
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( integer ~signed_short ) ) ) ) ) )
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( make_tokdef ~cpp.vtab.type
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( nat n ) shape
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( compound
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( ~comp_off
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( offset_max
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( shape_offset
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( nof n ~cpp.pmf.type ) )
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( shape_offset extra ) ) ) ) )
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#
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# CONSTRUCT A VIRTUAL FUNCTION TABLE
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#
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# This token constructs a virtual function table of size n consisting of
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# the run-time type information r, the offset a and the pointer to member
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# functions f.
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#
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( make_tokdef ~cpp.vtab.make
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( exp r exp a nat n exp f ) exp
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( make_compound
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( shape_offset ( ~cpp.vtab.type n ) )
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( offset_zero ( alignment extra ) )
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( make_compound
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( shape_offset extra )
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extra.rtti
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r
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extra.off
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( change_variety impossible ~signed_short
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( negate wrap ( ~cpp.offset.div a ) ) ) )
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( offset_pad
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( alignment ~cpp.pmf.type )
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( shape_offset ~cpp.pmf.type ) )
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f ) )
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#
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# FIND A VIRTUAL FUNCTION TABLE ENTRY
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#
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# These tokens gives a pointer to the nth pointer to member function in the
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# virtual function table t.
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#
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( make_tokdef ~cpp.vtab.func_exp
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( exp t exp n ) exp
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( add_to_ptr
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( contents
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( pointer ( alignment ~cpp.vtab.diag ) )
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t )
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( offset_mult
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( offset_pad
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( alignment ~cpp.pmf.type )
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( shape_offset ~cpp.pmf.type ) )
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n ) ) )
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( make_tokdef ~cpp.vtab.func
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( exp t signed_nat n ) exp
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( ~cpp.vtab.func_exp t ( make_int ~signed_int n ) ) )
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( make_tokdef ~cpp.vtab.off
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( signed_nat n ) exp
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( offset_mult
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( offset_pad
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( alignment ~cpp.pmf.type )
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( shape_offset ~cpp.pmf.type ) )
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( make_int ~signed_int n ) ) )
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#
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# FIND RUN-TIME TYPE INFORMATION
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#
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# This token gives the run-time type information structure associated
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# with the virtual function table t.
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#
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( make_tokdef ~cpp.typeid.ref
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( exp t ) exp
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( contents
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( pointer ( alignment ~cpp.typeid.type ) )
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( add_to_ptr
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( contents
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( pointer ( alignment ~cpp.vtab.diag ) )
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t )
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extra.rtti ) ) )
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#
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# PURE VIRTUAL FUNCTION
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#
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# This token gives the function pointer used in the entry for a pure virtual
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# in a virtual function table.
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#
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( make_tokdef ~cpp.vtab.pure
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exp
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( obtain_tag __TCPPLUS_pure ) )
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