Re: [PATCH] Typed DWARF stack

["H.J. Lu" <hjl.tools@gmail.com>]

On Tue, May 3, 2011 at 6:33 AM, H.J. Lu <hjl.tools@gmail.com> wrote:
> On Sat, Apr 16, 2011 at 1:11 AM, Jakub Jelinek <jakub@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  <jakub@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
>

This also caused:

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48928

-- 
H.J.