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re PR debug/83941 (Debug info generated with -flto contains useless forwarders)

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2018-09-25  Richard Biener  <rguenther@suse.de>

	PR debug/83941
	* dwarf2out.c (add_AT_external_die_ref): Remove now redundant
	GC-ification.
	(maybe_create_die_with_external_ref): Do not create
	DW_TAG_imported_unit here.
	(add_abstract_origin_attribute): Handle external BLOCK refs.
	(dwarf2out_abstract_function): Simplify LTO case.
	(dwarf2out_early_finish): Create DW_TAG_imported_unit explicitely
	rather than using maybe_create_die_with_external_ref.

From-SVN: r264573
This commit is contained in:
Richard Biener 2018-09-25 14:51:39 +00:00 committed by Richard Biener
parent f5ec13f15d
commit 4fb792e189
2 changed files with 40 additions and 27 deletions
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12
gcc/ChangeLog
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@ -1,3 +1,15 @@
2018-09-25 Richard Biener <rguenther@suse.de>
PR debug/83941
* dwarf2out.c (add_AT_external_die_ref): Remove now redundant
GC-ification.
(maybe_create_die_with_external_ref): Do not create
DW_TAG_imported_unit here.
(add_abstract_origin_attribute): Handle external BLOCK refs.
(dwarf2out_abstract_function): Simplify LTO case.
(dwarf2out_early_finish): Create DW_TAG_imported_unit explicitely
rather than using maybe_create_die_with_external_ref.
2018-09-25 Uros Bizjak <ubizjak@gmail.com>
* config/i386/i386.md (frndintxf2_mask_pm): Remove.

55
gcc/dwarf2out.c
View File

@ -5868,7 +5868,7 @@ add_AT_external_die_ref (dw_die_ref die, enum dwarf_attribute attr_kind,
/* ??? We probably want to share these, thus put a ref to the DIE
we create here to the external_die_map entry. */
dw_die_ref ref = new_die_raw (die->die_tag);
ref->die_id.die_symbol = IDENTIFIER_POINTER (get_identifier (symbol));
ref->die_id.die_symbol = symbol;
ref->die_offset = offset;
ref->with_offset = 1;
add_AT_die_ref (die, attr_kind, ref);
@ -5966,8 +5966,6 @@ maybe_create_die_with_external_ref (tree decl)
case TRANSLATION_UNIT_DECL:
{
die = comp_unit_die ();
dw_die_ref import = new_die (DW_TAG_imported_unit, die, NULL_TREE);
add_AT_external_die_ref (import, DW_AT_import, sym, off);
/* We re-target all CU decls to the LTRANS CU DIE, so no need
to create a DIE for the original CUs. */
return die;
@ -21134,19 +21132,21 @@ add_abstract_origin_attribute (dw_die_ref die, tree origin)
{
dw_die_ref origin_die = NULL;
if (DECL_P (origin))
/* For late LTO debug output we want to refer directly to the abstract
DIE in the early debug rather to the possibly existing concrete
instance and avoid creating that just for this purpose. */
sym_off_pair *desc;
if (in_lto_p
&& external_die_map
&& (desc = external_die_map->get (origin)))
{
sym_off_pair *desc;
if (in_lto_p
&& external_die_map
&& (desc = external_die_map->get (origin)))
{
add_AT_external_die_ref (die, DW_AT_abstract_origin,
desc->sym, desc->off);
return;
}
origin_die = lookup_decl_die (origin);
add_AT_external_die_ref (die, DW_AT_abstract_origin,
desc->sym, desc->off);
return;
}
if (DECL_P (origin))
origin_die = lookup_decl_die (origin);
else if (TYPE_P (origin))
origin_die = lookup_type_die (origin);
else if (TREE_CODE (origin) == BLOCK)
@ -22458,21 +22458,15 @@ dwarf2out_abstract_function (tree decl)
if (DECL_IGNORED_P (decl))
return;
/* Do not lazily create a DIE for decl here just because we
got called via debug_hooks->outlining_inline_function. */
if (in_lto_p
&& external_die_map
&& external_die_map->get (decl))
/* In LTO we're all set. We already created abstract instances
early and we want to avoid creating a concrete instance of that
if we don't output it. */
if (in_lto_p)
return;
old_die = lookup_decl_die (decl);
/* With early debug we always have an old DIE unless we are in LTO
and the user did not compile but only link with debug. */
if (in_lto_p && ! old_die)
return;
gcc_assert (old_die != NULL);
if (get_AT (old_die, DW_AT_inline)
|| get_AT (old_die, DW_AT_abstract_origin))
if (get_AT (old_die, DW_AT_inline))
/* We've already generated the abstract instance. */
return;
@ -31907,8 +31901,15 @@ dwarf2out_early_finish (const char *filename)
{
unsigned i;
tree tu;
FOR_EACH_VEC_SAFE_ELT (all_translation_units, i, tu)
maybe_create_die_with_external_ref (tu);
if (external_die_map)
FOR_EACH_VEC_SAFE_ELT (all_translation_units, i, tu)
if (sym_off_pair *desc = external_die_map->get (tu))
{
dw_die_ref import = new_die (DW_TAG_imported_unit,
comp_unit_die (), NULL_TREE);
add_AT_external_die_ref (import, DW_AT_import,
desc->sym, desc->off);
}
}
early_dwarf_finished = true;