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Re: [PATCH] Emit Fortran PARAMETERs as DW_TAG_constant into debuginfo
- From: Laurent GUERBY <laurent at guerby dot net>
- To: Jakub Jelinek <jakub at redhat dot com>
- Cc: Jason Merrill <jason at redhat dot com>, gcc-patches at gcc dot gnu dot org, fortran at gcc dot gnu dot org
- Date: Sat, 30 Aug 2008 12:07:49 +0200
- Subject: Re: [PATCH] Emit Fortran PARAMETERs as DW_TAG_constant into debuginfo
- References: <20080826184548.GD23259@hs20-bc2-1.build.redhat.com>
Hi,
Ada currently fails to bootstrap on x86_64-linux at rev 139798
/home/guerby/build03/./prev-gcc/xgcc -B/home/guerby/build03/./prev-gcc/ -B/n/17/guerby/install03/x86_64-unknown-linux-gnu/bin/ -c -g -O2 -gnatpg -gnata -nostdinc -I- -I. -Iada -I../../trunk/gcc/ada -I../../trunk/gcc/ada/gcc-interface ../../trunk/gcc/ada/exp_attr.adb -o ada/exp_attr.o
+===========================GNAT BUG DETECTED==============================+
| 4.4.0 20080830 (experimental) [trunk revision 139798] (x86_64-unknown-linux-gnu) GCC error:|
| in native_encode_initializer, at dwarf2out.c:11869 |
| Error detected around ../../trunk/gcc/ada/eval_fat.adb:898 |
Since your patch touches native_encode_initializer it might be
the culprit, did you enable Ada during your test?
Thanks in advance,
Laurent
On Tue, 2008-08-26 at 14:45 -0400, Jakub Jelinek wrote:
> Hi!
>
> This patch emits Fortran PARAMETERs as DW_TAG_constant and unreferenced
> non-use-associated variables with initializers as DW_TAG_variable with
> DW_AT_const_value.
>
> Regtested on x86_64-linux, ok for trunk?
>
> 2008-08-26 Jakub Jelinek <jakub@redhat.com>
>
> * dwarf2out.c (gen_const_die): New function.
> (size_of_die, value_format, output_die): Output larger
> dw_val_class_vec using DW_FORM_block2 or DW_FORM_block4.
> (native_encode_initializer): New function.
> (tree_add_const_value_attribute): Call it.
> (gen_decl_die, dwarf2out_decl): Handle CONST_DECLs if is_fortran ().
>
> * trans-decl.c (check_constant_initializer,
> gfc_emit_parameter_debug_info): New functions.
> (gfc_generate_module_vars, gfc_generate_function_code): Emit
> PARAMETERs and unreferenced variables with initializers into
> debug info.
>
> --- gcc/fortran/trans-decl.c.jj 2008-08-25 13:16:17.000000000 +0200
> +++ gcc/fortran/trans-decl.c 2008-08-26 19:22:55.000000000 +0200
> @@ -3232,6 +3232,134 @@ gfc_trans_use_stmts (gfc_namespace * ns)
> }
>
>
> +/* Return true if expr is a constant initializer that gfc_conv_initializer
> + will handle. */
> +
> +static bool
> +check_constant_initializer (gfc_expr *expr, gfc_typespec *ts, bool array,
> + bool pointer)
> +{
> + gfc_constructor *c;
> + gfc_component *cm;
> +
> + if (pointer)
> + return true;
> + else if (array)
> + {
> + if (expr->expr_type == EXPR_CONSTANT || expr->expr_type == EXPR_NULL)
> + return true;
> + else if (expr->expr_type == EXPR_STRUCTURE)
> + return check_constant_initializer (expr, ts, false, false);
> + else if (expr->expr_type != EXPR_ARRAY)
> + return false;
> + for (c = expr->value.constructor; c; c = c->next)
> + {
> + if (c->iterator)
> + return false;
> + if (c->expr->expr_type == EXPR_STRUCTURE)
> + {
> + if (!check_constant_initializer (c->expr, ts, false, false))
> + return false;
> + }
> + else if (c->expr->expr_type != EXPR_CONSTANT)
> + return false;
> + }
> + return true;
> + }
> + else switch (ts->type)
> + {
> + case BT_DERIVED:
> + if (expr->expr_type != EXPR_STRUCTURE)
> + return false;
> + cm = expr->ts.derived->components;
> + for (c = expr->value.constructor; c; c = c->next, cm = cm->next)
> + {
> + if (!c->expr || cm->allocatable)
> + continue;
> + if (!check_constant_initializer (c->expr, &cm->ts, cm->dimension,
> + cm->pointer))
> + return false;
> + }
> + return true;
> + default:
> + return expr->expr_type == EXPR_CONSTANT;
> + }
> +}
> +
> +/* Emit debug info for parameters and unreferenced variables with
> + initializers. */
> +
> +static void
> +gfc_emit_parameter_debug_info (gfc_symbol *sym)
> +{
> + tree decl;
> +
> + if (sym->attr.flavor != FL_PARAMETER
> + && (sym->attr.flavor != FL_VARIABLE || sym->attr.referenced))
> + return;
> +
> + if (sym->backend_decl != NULL
> + || sym->value == NULL
> + || sym->attr.use_assoc
> + || sym->attr.dummy
> + || sym->attr.result
> + || sym->attr.function
> + || sym->attr.intrinsic
> + || sym->attr.pointer
> + || sym->attr.allocatable
> + || sym->attr.cray_pointee
> + || sym->attr.threadprivate
> + || sym->attr.is_bind_c
> + || sym->attr.subref_array_pointer
> + || sym->attr.assign)
> + return;
> +
> + if (sym->ts.type == BT_CHARACTER)
> + {
> + gfc_conv_const_charlen (sym->ts.cl);
> + if (sym->ts.cl->backend_decl == NULL
> + || TREE_CODE (sym->ts.cl->backend_decl) != INTEGER_CST)
> + return;
> + }
> + else if (sym->ts.type == BT_DERIVED && sym->ts.derived->attr.alloc_comp)
> + return;
> +
> + if (sym->as)
> + {
> + int n;
> +
> + if (sym->as->type != AS_EXPLICIT)
> + return;
> + for (n = 0; n < sym->as->rank; n++)
> + if (sym->as->lower[n]->expr_type != EXPR_CONSTANT
> + || sym->as->upper[n] == NULL
> + || sym->as->upper[n]->expr_type != EXPR_CONSTANT)
> + return;
> + }
> +
> + if (!check_constant_initializer (sym->value, &sym->ts,
> + sym->attr.dimension, false))
> + return;
> +
> + /* Create the decl for the variable or constant. */
> + decl = build_decl (sym->attr.flavor == FL_PARAMETER ? CONST_DECL : VAR_DECL,
> + gfc_sym_identifier (sym), gfc_sym_type (sym));
> + if (sym->attr.flavor == FL_PARAMETER)
> + TREE_READONLY (decl) = 1;
> + gfc_set_decl_location (decl, &sym->declared_at);
> + if (sym->attr.dimension)
> + GFC_DECL_PACKED_ARRAY (decl) = 1;
> + DECL_CONTEXT (decl) = sym->ns->proc_name->backend_decl;
> + TREE_STATIC (decl) = 1;
> + TREE_USED (decl) = 1;
> + if (DECL_CONTEXT (decl) && TREE_CODE (DECL_CONTEXT (decl)) == NAMESPACE_DECL)
> + TREE_PUBLIC (decl) = 1;
> + DECL_INITIAL (decl)
> + = gfc_conv_initializer (sym->value, &sym->ts, TREE_TYPE (decl),
> + sym->attr.dimension, 0);
> + debug_hooks->global_decl (decl);
> +}
> +
> /* Generate all the required code for module variables. */
>
> void
> @@ -3252,6 +3380,7 @@ gfc_generate_module_vars (gfc_namespace
> cur_module = NULL;
>
> gfc_trans_use_stmts (ns);
> + gfc_traverse_ns (ns, gfc_emit_parameter_debug_info);
> }
>
>
> @@ -3787,6 +3916,7 @@ gfc_generate_function_code (gfc_namespac
> }
>
> gfc_trans_use_stmts (ns);
> + gfc_traverse_ns (ns, gfc_emit_parameter_debug_info);
> }
>
> void
> --- gcc/dwarf2out.c.jj 2008-08-22 20:12:22.000000000 +0200
> +++ gcc/dwarf2out.c 2008-08-26 19:46:49.000000000 +0200
> @@ -5102,6 +5102,7 @@ static void gen_unspecified_parameters_d
> static void gen_formal_types_die (tree, dw_die_ref);
> static void gen_subprogram_die (tree, dw_die_ref);
> static void gen_variable_die (tree, dw_die_ref);
> +static void gen_const_die (tree, dw_die_ref);
> static void gen_label_die (tree, dw_die_ref);
> static void gen_lexical_block_die (tree, dw_die_ref, int);
> static void gen_inlined_subroutine_die (tree, dw_die_ref, int);
> @@ -7573,8 +7574,10 @@ size_of_die (dw_die_ref die)
> size += 1 + 2*HOST_BITS_PER_LONG/HOST_BITS_PER_CHAR; /* block */
> break;
> case dw_val_class_vec:
> - size += 1 + (a->dw_attr_val.v.val_vec.length
> - * a->dw_attr_val.v.val_vec.elt_size); /* block */
> + size += constant_size (a->dw_attr_val.v.val_vec.length
> + * a->dw_attr_val.v.val_vec.elt_size)
> + + a->dw_attr_val.v.val_vec.length
> + * a->dw_attr_val.v.val_vec.elt_size; /* block */
> break;
> case dw_val_class_flag:
> size += 1;
> @@ -7773,7 +7776,18 @@ value_format (dw_attr_ref a)
> case dw_val_class_long_long:
> return DW_FORM_block1;
> case dw_val_class_vec:
> - return DW_FORM_block1;
> + switch (constant_size (a->dw_attr_val.v.val_vec.length
> + * a->dw_attr_val.v.val_vec.elt_size))
> + {
> + case 1:
> + return DW_FORM_block1;
> + case 2:
> + return DW_FORM_block2;
> + case 4:
> + return DW_FORM_block4;
> + default:
> + gcc_unreachable ();
> + }
> case dw_val_class_flag:
> return DW_FORM_flag;
> case dw_val_class_die_ref:
> @@ -8065,7 +8079,8 @@ output_die (dw_die_ref die)
> unsigned int i;
> unsigned char *p;
>
> - dw2_asm_output_data (1, len * elt_size, "%s", name);
> + dw2_asm_output_data (constant_size (len * elt_size),
> + len * elt_size, "%s", name);
> if (elt_size > sizeof (HOST_WIDE_INT))
> {
> elt_size /= 2;
> @@ -11771,6 +11786,150 @@ add_location_or_const_value_attribute (d
> tree_add_const_value_attribute (die, decl);
> }
>
> +/* Helper function for tree_add_const_value_attribute. Natively encode
> + initializer INIT into an array. Return true if successful. */
> +
> +static bool
> +native_encode_initializer (tree init, unsigned char *array, int size)
> +{
> + tree type;
> +
> + if (init == NULL_TREE)
> + return false;
> +
> + STRIP_NOPS (init);
> + switch (TREE_CODE (init))
> + {
> + case STRING_CST:
> + type = TREE_TYPE (init);
> + if (TREE_CODE (type) == ARRAY_TYPE)
> + {
> + tree enttype = TREE_TYPE (type);
> + enum machine_mode mode = TYPE_MODE (enttype);
> +
> + if (GET_MODE_CLASS (mode) != MODE_INT || GET_MODE_SIZE (mode) != 1)
> + return false;
> + if (int_size_in_bytes (type) != size)
> + return false;
> + if (size > TREE_STRING_LENGTH (init))
> + {
> + memcpy (array, TREE_STRING_POINTER (init),
> + TREE_STRING_LENGTH (init));
> + memset (array + TREE_STRING_LENGTH (init),
> + '\0', size - TREE_STRING_LENGTH (init));
> + }
> + else
> + memcpy (array, TREE_STRING_POINTER (init), size);
> + return true;
> + }
> + return false;
> + case CONSTRUCTOR:
> + type = TREE_TYPE (init);
> + if (int_size_in_bytes (type) != size)
> + return false;
> + if (TREE_CODE (type) == ARRAY_TYPE)
> + {
> + HOST_WIDE_INT min_index;
> + unsigned HOST_WIDE_INT cnt;
> + int curpos = 0, fieldsize;
> + constructor_elt *ce;
> +
> + if (TYPE_DOMAIN (type) == NULL_TREE
> + || !host_integerp (TYPE_MIN_VALUE (TYPE_DOMAIN (type)), 0))
> + return false;
> +
> + fieldsize = int_size_in_bytes (TREE_TYPE (type));
> + if (fieldsize <= 0)
> + return false;
> +
> + min_index = tree_low_cst (TYPE_MIN_VALUE (TYPE_DOMAIN (type)), 0);
> + memset (array, '\0', size);
> + for (cnt = 0;
> + VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (init), cnt, ce);
> + cnt++)
> + {
> + tree val = ce->value;
> + tree index = ce->index;
> + int pos = curpos;
> + if (index && TREE_CODE (index) == RANGE_EXPR)
> + pos = (tree_low_cst (TREE_OPERAND (index, 0), 0) - min_index)
> + * fieldsize;
> + else if (index)
> + pos = tree_low_cst (index, 0) * fieldsize;
> +
> + if (val)
> + {
> + STRIP_NOPS (val);
> + if (!native_encode_initializer (val, array + pos, fieldsize))
> + return false;
> + }
> + curpos = pos + fieldsize;
> + if (index && TREE_CODE (index) == RANGE_EXPR)
> + {
> + int count = tree_low_cst (TREE_OPERAND (index, 1), 0)
> + - tree_low_cst (TREE_OPERAND (index, 0), 0);
> + while (count > 0)
> + {
> + if (val)
> + memcpy (array + curpos, array + pos, fieldsize);
> + curpos += fieldsize;
> + }
> + }
> + gcc_assert (curpos <= size);
> + }
> + return true;
> + }
> + else if (TREE_CODE (type) == RECORD_TYPE
> + || TREE_CODE (type) == UNION_TYPE)
> + {
> + tree field = NULL_TREE;
> + unsigned HOST_WIDE_INT cnt;
> + constructor_elt *ce;
> +
> + if (int_size_in_bytes (type) != size)
> + return false;
> +
> + if (TREE_CODE (type) == RECORD_TYPE)
> + field = TYPE_FIELDS (type);
> +
> + for (cnt = 0;
> + VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (init), cnt, ce);
> + cnt++, field = field ? TREE_CHAIN (field) : 0)
> + {
> + tree val = ce->value;
> + int pos, fieldsize;
> +
> + if (ce->index != 0)
> + field = ce->index;
> +
> + if (val)
> + STRIP_NOPS (val);
> +
> + if (field == NULL_TREE || DECL_BIT_FIELD (field))
> + return false;
> +
> + if (TREE_CODE (TREE_TYPE (field)) == ARRAY_TYPE
> + && TYPE_DOMAIN (TREE_TYPE (field))
> + && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (field))))
> + return false;
> + else if (DECL_SIZE_UNIT (field) == NULL_TREE
> + || !host_integerp (DECL_SIZE_UNIT (field), 0))
> + return false;
> + fieldsize = tree_low_cst (DECL_SIZE_UNIT (field), 0);
> + pos = int_byte_position (field);
> + gcc_assert (pos + fieldsize <= size);
> + if (val
> + && !native_encode_initializer (val, array + pos, fieldsize))
> + return false;
> + }
> + return true;
> + }
> + return false;
> + default:
> + return native_encode_expr (init, array, size) == size;
> + }
> +}
> +
> /* If we don't have a copy of this variable in memory for some reason (such
> as a C++ member constant that doesn't have an out-of-line definition),
> we should tell the debugger about the constant value. */
> @@ -11790,6 +11949,18 @@ tree_add_const_value_attribute (dw_die_r
> rtl = rtl_for_decl_init (init, type);
> if (rtl)
> add_const_value_attribute (var_die, rtl);
> + /* If the host and target are sane, try harder. */
> + else if (CHAR_BIT == 8 && BITS_PER_UNIT == 8)
> + {
> + HOST_WIDE_INT size = int_size_in_bytes (TREE_TYPE (init));
> + if (size > 0 && (int) size == size)
> + {
> + unsigned char *array = GGC_CNEWVEC (unsigned char, size);
> +
> + if (native_encode_initializer (init, array, size))
> + add_AT_vec (var_die, DW_AT_const_value, size, 1, array);
> + }
> + }
> }
>
> /* Convert the CFI instructions for the current function into a
> @@ -13752,6 +13923,24 @@ gen_variable_die (tree decl, dw_die_ref
> tree_add_const_value_attribute (var_die, decl);
> }
>
> +/* Generate a DIE to represent a named constant. */
> +
> +static void
> +gen_const_die (tree decl, dw_die_ref context_die)
> +{
> + dw_die_ref const_die;
> + tree type = TREE_TYPE (decl);
> +
> + const_die = new_die (DW_TAG_constant, context_die, decl);
> + add_name_and_src_coords_attributes (const_die, decl);
> + add_type_attribute (const_die, type, 1, 0, context_die);
> + if (TREE_PUBLIC (decl))
> + add_AT_flag (const_die, DW_AT_external, 1);
> + if (DECL_ARTIFICIAL (decl))
> + add_AT_flag (const_die, DW_AT_artificial, 1);
> + tree_add_const_value_attribute (const_die, decl);
> +}
> +
> /* Generate a DIE to represent a label identifier. */
>
> static void
> @@ -14892,8 +15081,20 @@ gen_decl_die (tree decl, dw_die_ref cont
> break;
>
> case CONST_DECL:
> - /* The individual enumerators of an enum type get output when we output
> - the Dwarf representation of the relevant enum type itself. */
> + if (!is_fortran ())
> + {
> + /* The individual enumerators of an enum type get output when we output
> + the Dwarf representation of the relevant enum type itself. */
> + break;
> + }
> +
> + /* Emit its type. */
> + gen_type_die (TREE_TYPE (decl), context_die);
> +
> + /* And its containing namespace. */
> + context_die = declare_in_namespace (decl, context_die);
> +
> + gen_const_die (decl, context_die);
> break;
>
> case FUNCTION_DECL:
> @@ -15238,6 +15439,15 @@ dwarf2out_decl (tree decl)
> return;
> break;
>
> + case CONST_DECL:
> + if (debug_info_level <= DINFO_LEVEL_TERSE)
> + return;
> + if (!is_fortran ())
> + return;
> + if (TREE_STATIC (decl) && decl_function_context (decl))
> + context_die = lookup_decl_die (DECL_CONTEXT (decl));
> + break;
> +
> case NAMESPACE_DECL:
> if (debug_info_level <= DINFO_LEVEL_TERSE)
> return;
>
> Jakub
>