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Re: Is bitstring support still useful?


On 18 Jul 2009, at 06:09, Daniel Jacobowitz wrote:

Does this compiler support DWARF,

Yes.

and if so, how do you represent them
there?


type
  ta = bitpacked array[1..10] of 0..2;

becomes:

0x0000007d:     TAG_array_type [5] *
                 AT_name( "TA" )
                 AT_byte_size( 0x00000003 )
                 AT_bit_stride( 0x00000002 )
                 AT_type( {0x00000094} ( subrange BYTE ) )

0x00000087:         TAG_subrange_type [6]
                     AT_lower_bound( 0x00000001 )
                     AT_upper_bound( 0x0000000a )
                     AT_type( {0x000000a0} ( SHORTINT ) )

0x0000008e: NULL


gdb does not handle this yet though (DW_AT_bit_stride is unsupported in dwarf2read.c). Printing a variable of this type therefore prints it as if it were an array of 10 bytes. But at least the concept is representable in DWARF-3, and it just needs fixes in the DWARF reader (and possibly in the Pascal printer).


Jonas

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