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riscv-gcc-1
Commit c0134358 by Mark Wielaard Committed by Mark Wielaard
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DWARF: Emit DWARF5 forms for indirect addresses and string offsets. 

We already emit DWARF5 attributes and tables for indirect addresses
and string offsets, but still use GNU forms. Add a new helper function
dwarf_FORM () for emitting the right form.

Currently we only use the uleb128 forms. But DWARF5 also allows
1, 2, 3 and 4 byte forms (DW_FORM_strx[1234] and DW_FORM_addrx[1234])
which might be more space efficient.

gcc/ChangeLog

	* dwarf2out.c (dwarf_FORM): New function.
	(set_indirect_string): Use dwarf_FORM.
	(reset_indirect_string): Likewise.
	(size_of_die): Likewise.
	(value_format): Likewise.
	(output_die): Likewise.
	(add_skeleton_AT_string): Likewise.
	(output_macinfo_op): Likewise.
	(index_string): Likewise.
	(output_index_string_offset): Likewise.
	(output_index_string): Likewise.

From-SVN: r260297
parent b958e1c1
Showing with 52 additions and 15 deletions
gcc/ChangeLog
2018-05-16 Mark Wielaard <mark@klomp.org>
* dwarf2out.c (dwarf_FORM): New function.
(set_indirect_string): Use dwarf_FORM.
(reset_indirect_string): Likewise.
(size_of_die): Likewise.
(value_format): Likewise.
(output_die): Likewise.
(add_skeleton_AT_string): Likewise.
(output_macinfo_op): Likewise.
(index_string): Likewise.
(output_index_string_offset): Likewise.
(output_index_string): Likewise.
(count_index_strings): Likewise.
2018-05-16 Carl Love <cel@us.ibm.com>
* config/rs6000/rs6000.md (prefetch): Generate ISA 2.06 instructions
......
gcc/dwarf2out.c
......@@ -246,7 +246,7 @@ static GTY (()) hash_table<indirect_string_hasher> *debug_line_str_hash;
That is, the comp_dir and dwo_name will appear in both places.
2) Strings can use four forms: DW_FORM_string, DW_FORM_strp,
DW_FORM_line_strp or DW_FORM_GNU_str_index.
DW_FORM_line_strp or DW_FORM_strx/GNU_str_index.
3) GCC chooses the form to use late, depending on the size and
reference count.
......@@ -1767,6 +1767,28 @@ dwarf_TAG (enum dwarf_tag tag)
return tag;
}
/* And similarly for forms. */
static inline enum dwarf_form
dwarf_FORM (enum dwarf_form form)
{
switch (form)
{
case DW_FORM_addrx:
if (dwarf_version < 5)
return DW_FORM_GNU_addr_index;
break;
case DW_FORM_strx:
if (dwarf_version < 5)
return DW_FORM_GNU_str_index;
break;
default:
break;
}
return form;
}
static unsigned long int get_base_type_offset (dw_die_ref);
/* Return the size of a location descriptor. */
......@@ -4403,8 +4425,8 @@ AT_class (dw_attr_node *a)
}
/* Return the index for any attribute that will be referenced with a
DW_FORM_GNU_addr_index or DW_FORM_GNU_str_index. String indices
are stored in dw_attr_val.v.val_str for reference counting
DW_FORM_addrx/GNU_addr_index or DW_FORM_strx/GNU_str_index. String
indices are stored in dw_attr_val.v.val_str for reference counting
pruning. */
static inline unsigned int
......@@ -4668,7 +4690,7 @@ set_indirect_string (struct indirect_string_node *node)
/* Already indirect is a no op. */
if (node->form == DW_FORM_strp
|| node->form == DW_FORM_line_strp
|| node->form == DW_FORM_GNU_str_index)
|| node->form == dwarf_FORM (DW_FORM_strx))
{
gcc_assert (node->label);
return;
......@@ -4684,7 +4706,7 @@ set_indirect_string (struct indirect_string_node *node)
}
else
{
node->form = DW_FORM_GNU_str_index;
node->form = dwarf_FORM (DW_FORM_strx);
node->index = NO_INDEX_ASSIGNED;
}
}
......@@ -4697,7 +4719,7 @@ int
reset_indirect_string (indirect_string_node **h, void *)
{
struct indirect_string_node *node = *h;
if (node->form == DW_FORM_strp || node->form == DW_FORM_GNU_str_index)
if (node->form == DW_FORM_strp || node->form == dwarf_FORM (DW_FORM_strx))
{
free (node->label);
node->label = NULL;
......@@ -9435,7 +9457,7 @@ size_of_die (dw_die_ref die)
form = AT_string_form (a);
if (form == DW_FORM_strp || form == DW_FORM_line_strp)
size += DWARF_OFFSET_SIZE;
else if (form == DW_FORM_GNU_str_index)
else if (form == dwarf_FORM (DW_FORM_strx))
size += size_of_uleb128 (AT_index (a));
else
size += strlen (a->dw_attr_val.v.val_str->str) + 1;
......@@ -9682,7 +9704,7 @@ value_format (dw_attr_node *a)
case DW_AT_entry_pc:
case DW_AT_trampoline:
return (AT_index (a) == NOT_INDEXED
? DW_FORM_addr : DW_FORM_GNU_addr_index);
? DW_FORM_addr : dwarf_FORM (DW_FORM_addrx));
default:
break;
}
......@@ -9855,7 +9877,7 @@ value_format (dw_attr_node *a)
return DW_FORM_data;
case dw_val_class_lbl_id:
return (AT_index (a) == NOT_INDEXED
? DW_FORM_addr : DW_FORM_GNU_addr_index);
? DW_FORM_addr : dwarf_FORM (DW_FORM_addrx));
case dw_val_class_lineptr:
case dw_val_class_macptr:
case dw_val_class_loclistsptr:
......@@ -10823,7 +10845,7 @@ output_die (dw_die_ref die)
a->dw_attr_val.v.val_str->label,
debug_line_str_section,
"%s: \"%s\"", name, AT_string (a));
else if (a->dw_attr_val.v.val_str->form == DW_FORM_GNU_str_index)
else if (a->dw_attr_val.v.val_str->form == dwarf_FORM (DW_FORM_strx))
dw2_asm_output_data_uleb128 (AT_index (a),
"%s: \"%s\"", name, AT_string (a));
else
......@@ -11104,7 +11126,7 @@ add_skeleton_AT_string (dw_die_ref die, enum dwarf_attribute attr_kind,
node = find_AT_string_in_table (str, skeleton_debug_str_hash);
find_string_form (node);
if (node->form == DW_FORM_GNU_str_index)
if (node->form == dwarf_FORM (DW_FORM_strx))
node->form = DW_FORM_strp;
attr.dw_attr = attr_kind;
......@@ -28070,7 +28092,7 @@ output_macinfo_op (macinfo_entry *ref)
node = find_AT_string (ref->info);
gcc_assert (node
&& (node->form == DW_FORM_strp
|| node->form == DW_FORM_GNU_str_index));
|| node->form == dwarf_form (DW_FORM_strx)));
dw2_asm_output_data (1, ref->code,
ref->code == DW_MACRO_define_strp
? "Define macro strp"
......@@ -28701,7 +28723,7 @@ index_string (indirect_string_node **h, unsigned int *index)
indirect_string_node *node = *h;
find_string_form (node);
if (node->form == DW_FORM_GNU_str_index && node->refcount > 0)
if (node->form == dwarf_FORM (DW_FORM_strx) && node->refcount > 0)
{
gcc_assert (node->index == NO_INDEX_ASSIGNED);
node->index = *index;
......@@ -28719,7 +28741,7 @@ output_index_string_offset (indirect_string_node **h, unsigned int *offset)
{
indirect_string_node *node = *h;
if (node->form == DW_FORM_GNU_str_index && node->refcount > 0)
if (node->form == dwarf_FORM (DW_FORM_strx) && node->refcount > 0)
{
/* Assert that this node has been assigned an index. */
gcc_assert (node->index != NO_INDEX_ASSIGNED
......@@ -28739,7 +28761,7 @@ output_index_string (indirect_string_node **h, unsigned int *cur_idx)
{
struct indirect_string_node *node = *h;
if (node->form == DW_FORM_GNU_str_index && node->refcount > 0)
if (node->form == dwarf_FORM (DW_FORM_strx) && node->refcount > 0)
{
/* Assert that the strings are output in the same order as their
indexes were assigned. */
......
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