On Sat, Apr 16, 2011 at 1:11 AM, Jakub Jelinek <ja...@redhat.com> wrote:
> On Fri, Mar 25, 2011 at 12:32:37PM +0100, Jakub Jelinek wrote:
>> As I said in my GCC Summit talk, currently we just give up on
>> any floating point/_Decimal*/__int128 and for 32-bit targets even
>> long long expressions, as those can't be represented in DWARF4,
>> while var-tracking has all that often available.
>
> ...
>
> This is an updated patch for the typed DWARF stack support,
> against current trunk. I've changed DW_OP_GNU_reinterpret
> from 0xf8 to 0xf9, because 0xf8 is taken by PGI and e.g. binutils prefers no
> clashes between extension opcodes, otherwise readers would need to switch
> based on producer. When we are close to running out of extension opcodes,
> we may reconsider (especially as the HP block is quite large).
>
> Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
>
> 2011-04-16 Jakub Jelinek <ja...@redhat.com>
>
> * dwarf2.h (DW_OP_GNU_const_type, DW_OP_GNU_regval_type,
> DW_OP_GNU_deref_type, DW_OP_GNU_convert, DW_OP_GNU_reinterpret): New.
>
> * dwarf2out.c (get_address_mode): New inline.
> (mem_loc_descriptor): Add MEM_MODE parameter, adjust recursive calls,
> if not dwarf_strict emit
> DW_OP_GNU_{{const,regval,deref}_type,convert,reinterpret} when
> desirable. Handle FLOAT_EXTEND, FLOAT_TRUNCATE, FLOAT,
> UNSIGNED_FLOAT, FIX and UNSIGNED_FIX. Just return NULL for
> FMA, STRICT_LOW_PART, CONST_VECTOR and CONST_FIXED.
> (dwarf2out_frame_debug_cfa_expression, reg_loc_descriptor,
> dw_loc_list_1, cst_pool_loc_descr, loc_list_from_tree): Adjust
> mem_loc_descriptor callers.
> (dwarf_stack_op_name, size_of_loc_descr, output_loc_operands,
> output_loc_operands_raw, hash_loc_operands, compare_loc_operands):
> Handle DW_OP_GNU_const_type, DW_OP_GNU_regval_type,
> DW_OP_GNU_deref_type, DW_OP_GNU_convert and DW_OP_GNU_reinterpret.
> (base_types): New variable.
> (get_base_type_offset, calc_base_type_die_sizes,
> base_type_for_mode, mark_base_types, base_type_cmp,
> move_marked_base_types): New functions.
> (calc_die_sizes): Assert that die_offset is 0 or equal to
> next_die_offset.
> (loc_descriptor): Only handle here lowpart SUBREGs of REG, for
> others defer to mem_loc_descriptor. Adjust mem_loc_descriptor
> callers. If not dwarf_strict, call mem_loc_descriptor even for
> non-MODE_INT modes or MODE_INT modes larger than DWARF2_ADDR_SIZE.
> (gen_subprogram_die): Don't give up on call site parameters
> with non-integral or large integral modes. Adjust
> mem_loc_descriptor callers.
> (prune_unused_types): Call prune_unused_types_mark on base_types
> vector entries.
> (resolve_addr): Call mark_base_types.
> (dwarf2out_finish): Call move_marked_base_types.
This caused:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48853
H.J.
