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On Sun, Feb 28, 2010 at 4:15 PM, H.J. Lu <hjl.tools@gmail.com> wrote: > On Mon, Feb 22, 2010 at 8:45 AM, Daniel Jacobowitz <dan@codesourcery.com> wrote: >> Hi H.J., >> >> This patch adds <flags> support to the XML language. ?Could you try >> using this to move the two x86 flags registers from out of >> target-descriptions.c? >> >> The flags support is straightforward and covered by the manual. >> It's not tested because I couldn't find a way to do so; you can't >> ptype a flags register, and you can't add dummy registers whose value >> you can get at, only for ptype. >> >> The patch also adds <struct>, which is a little more interesting. >> It's got two forms: >> >> * Register containing integer bitfields. ?Each field must be >> explicitly positioned. ?The size must be pre-declared - otherwise >> the representation GDB uses for big-endian bitfields can't figure out >> how far from the MSB edge of the register the field is. >> >> * Register containing typed non-bitfield structures. ?Each field must >> be implicitly positioned. ?There's no support for padding. >> >> These are somewhat annoying limitations, but they suffice for >> everything I've needed this for since I wrote the patch, which was >> originally several years ago; it's been stuck in my submission queue >> because it was tangled up with other local patches. ?Since they are >> "must" restrictions, they are easy to lift in the future; we can make >> GDB more permissive. >> >> These I was able to type, although I'd have liked more exhaustive >> tests... for that, I'd need typeof, which turns out to be annoyingly >> hard to implement in GDB's parser :-( >> >> Eli, how's the documentation? >> >> -- >> Daniel Jacobowitz >> CodeSourcery >> >> 2010-02-22 ?Daniel Jacobowitz ?<dan@codesourcery.com> >> >> ? ? ? ?* gdbtypes.c (append_composite_type_field_raw): New. >> ? ? ? ?(append_composite_type_field_aligned): Use the new function. >> ? ? ? ?* gdbtypes.h (append_composite_type_field_raw): Declare. >> ? ? ? ?* target-descriptions.c (struct tdesc_type_field): Add start and end. >> ? ? ? ?(struct tdesc_type_flag): New type. >> ? ? ? ?(struct tdesc_type): Add TDESC_TYPE_STRUCT and TDESC_TYPE_FLAGS to >> ? ? ? ?kind. ?Add size to u.u. ?Add u.f for flags. >> ? ? ? ?(tdesc_gdb_type): Handle TDESC_TYPE_STRUCT and TDESC_TYPE_FLAGS. >> ? ? ? ?(tdesc_free_type): Likewise. >> ? ? ? ?(tdesc_create_struct, tdesc_set_struct_size, tdesc_create_flags): New. >> ? ? ? ?(tdesc_add_field): Handle TDESC_TYPE_STRUCT. >> ? ? ? ?(tdesc_add_bitfield, tdesc_add_flag): New. >> ? ? ? ?* target-descriptions.h (tdesc_create_struct, tdesc_set_struct_size) >> ? ? ? ?(tdesc_create_flags, tdesc_add_bitfield, tdesc_add_flag): Declare. >> ? ? ? ?* xml-tdesc.c (struct tdesc_parsing_data): Rename current_union to >> ? ? ? ?current_type. ?Add current_type_size and current_type_is_flags. >> ? ? ? ?(tdesc_start_union): Clear the new fields. >> ? ? ? ?(tdesc_start_struct, tdesc_start_flags): New. >> ? ? ? ?(tdesc_start_field): Handle struct fields, including bitfields. >> ? ? ? ?(field_attributes): Make type optional. ?Add start and end. >> ? ? ? ?(union_children): Rename to struct_union_children. >> ? ? ? ?(union_attributes): Rename to struct_union_attributes. ?Add optional >> ? ? ? ?size. >> ? ? ? ?(flags_attributes): New. >> ? ? ? ?(feature_children): Add struct and flags. >> ? ? ? ?* features/gdb-target.dtd: Add flags and struct to features. >> ? ? ? ?Make field type optional. ?Add field start and end. >> >> ? ? ? ?* gdb.texinfo (Types): Describe <struct> and <flags>. >> >> ? ? ? ?* gdb.xml/extra-regs.xml: Add struct1, struct2, and flags >> ? ? ? ?types. ?Add structreg, bitfields, and flags registers. >> ? ? ? ?* gdb.xml/tdesc-regs.exp: Test structreg and bitfields >> ? ? ? ?registers. >> > > It doesn't work. "case TDESC_TYPE_FLAGS:" is missing in > maint_print_c_tdesc_cmd. > > This patch makes it to work. However, there is no equivalent of append_flags_type_flag (type, 1, NULL); I have <flags id="i386_eflags" size="4"> <field name="CF" start="0" end="0"/> <field name="" start="1" end="1"/> <field name="PF" start="2" end="2"/> .... I got (gdb) p $eflags $1 = [ PF ZF IF ] ^ extra white space (gdb) instead of (gdb) p $eflags $1 = [ PF ZF IF ] (gdb) -- H.J.
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