fortran, debug: Fix up DW_AT_rank [PR103315]
Commit Message
Hi!
For DW_AT_rank we were emitting
.uleb128 0x4 # DW_AT_rank
.byte 0x97 # DW_OP_push_object_address
.byte 0x23 # DW_OP_plus_uconst
.uleb128 0x1c
.byte 0x6 # DW_OP_deref
on 64-bit and
.uleb128 0x4 # DW_AT_rank
.byte 0x97 # DW_OP_push_object_address
.byte 0x23 # DW_OP_plus_uconst
.uleb128 0x10
.byte 0x6 # DW_OP_deref
on 32-bit. I think this is wrong, as dtype.rank field in the descriptor
has unsigned char type, not pointer type nor pointer sized integral.
E.g. if we have a
REAL :: a(..)
dummy argument, which is passed as a reference to the function descriptor,
we want to evaluate a->dtype.rank. The above DWARF expressions perform
*(uintptr_t *)(a + 0x1c)
and
*(uintptr_t *)(a + 0x10)
respectively. The following patch changes those to:
.uleb128 0x5 # DW_AT_rank
.byte 0x97 # DW_OP_push_object_address
.byte 0x23 # DW_OP_plus_uconst
.uleb128 0x1c
.byte 0x94 # DW_OP_deref_size
.byte 0x1
and
.uleb128 0x5 # DW_AT_rank
.byte 0x97 # DW_OP_push_object_address
.byte 0x23 # DW_OP_plus_uconst
.uleb128 0x10
.byte 0x94 # DW_OP_deref_size
.byte 0x1
which perform
*(unsigned char *)(a + 0x1c)
and
*(unsigned char *)(a + 0x10)
respectively.
Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
2021-11-19 Jakub Jelinek <jakub@redhat.com>
PR debug/103315
* trans-types.c (gfc_get_array_descr_info): Use DW_OP_deref_size 1
instead of DW_OP_deref for DW_AT_rank.
Jakub
Comments
Le 19/11/2021 à 10:40, Jakub Jelinek via Fortran a écrit :
>
> Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
>
Hello,
you know probably better than me or any fortran maintainer whether it’s
good or bad.
So OK from the fortran side.
@@ -3459,8 +3459,8 @@ gfc_get_array_descr_info (const_tree typ
if (!integer_zerop (dtype_off))
t = fold_build_pointer_plus (t, rank_off);
- t = build1 (NOP_EXPR, build_pointer_type (gfc_array_index_type), t);
- t = build1 (INDIRECT_REF, gfc_array_index_type, t);
+ t = build1 (NOP_EXPR, build_pointer_type (TREE_TYPE (field)), t);
+ t = build1 (INDIRECT_REF, TREE_TYPE (field), t);
info->rank = t;
t = build0 (PLACEHOLDER_EXPR, TREE_TYPE (dim_off));
t = size_binop (MULT_EXPR, t, dim_size);