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From a50c11a7a47b26e6a3e095dfb72aa2e465919fb6 Mon Sep 17 00:00:00 2001
From: Nick Clifton <nickc@redhat.com>
Date: Fri, 5 Mar 2021 17:06:59 +0000
Subject: [PATCH] Add support for the DW_FORM_strx* forms to the BFD library.
PR 27521
* dwarf2.c (is_str_attr): Add DW_FORM_strx* forms.
(read_indexed_string): Placeholder function.
(read_attribute_value): Handle DW_FORM_strx* and DW_FORM_addrx*
forms.
Upstream-Status: Backport [https://sourceware.org/bugzilla/show_bug.cgi?id=27521]
Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
bfd/dwarf2.c | 105 ++++++++++++++++++++++++++++++++-------------------
1 file changed, 67 insertions(+), 38 deletions(-)
diff --git a/bfd/dwarf2.c b/bfd/dwarf2.c
index 5651696c0f7..5ffcd93f54c 100644
--- a/bfd/dwarf2.c
+++ b/bfd/dwarf2.c
@@ -1160,8 +1160,23 @@ read_abbrevs (bfd *abfd, bfd_uint64_t offset, struct dwarf2_debug *stash,
static inline bfd_boolean
is_str_attr (enum dwarf_form form)
{
- return (form == DW_FORM_string || form == DW_FORM_strp
- || form == DW_FORM_line_strp || form == DW_FORM_GNU_strp_alt);
+ return (form == DW_FORM_string
+ || form == DW_FORM_strp
+ || form == DW_FORM_strx
+ || form == DW_FORM_strx1
+ || form == DW_FORM_strx2
+ || form == DW_FORM_strx3
+ || form == DW_FORM_strx4
+ || form == DW_FORM_line_strp
+ || form == DW_FORM_GNU_strp_alt);
+}
+
+static const char *
+read_indexed_string (bfd_uint64_t index ATTRIBUTE_UNUSED,
+ struct comp_unit * unit ATTRIBUTE_UNUSED)
+{
+ /* FIXME: Add support for indexed strings. */
+ return "<indexed strings not yet supported>";
}
/* Read and fill in the value of attribute ATTR as described by FORM.
@@ -1192,6 +1207,9 @@ read_attribute_value (struct attribute * attr,
switch (form)
{
+ case DW_FORM_flag_present:
+ attr->u.val = 1;
+ break;
case DW_FORM_ref_addr:
/* DW_FORM_ref_addr is an address in DWARF2, and an offset in
DWARF3. */
@@ -1237,15 +1255,32 @@ read_attribute_value (struct attribute * attr,
info_ptr = read_n_bytes (info_ptr, info_ptr_end, blk);
attr->u.blk = blk;
break;
+ case DW_FORM_ref1:
+ case DW_FORM_flag:
+ case DW_FORM_data1:
+ case DW_FORM_addrx1:
+ attr->u.val = read_1_byte (abfd, info_ptr, info_ptr_end);
+ info_ptr += 1;
+ break;
case DW_FORM_data2:
+ case DW_FORM_ref2:
attr->u.val = read_2_bytes (abfd, info_ptr, info_ptr_end);
info_ptr += 2;
break;
+ case DW_FORM_addrx3:
+ attr->u.val = read_4_bytes (abfd, info_ptr, info_ptr_end);
+ attr->u.val &= 0xffffff;
+ info_ptr += 3;
+ break;
+ case DW_FORM_ref4:
case DW_FORM_data4:
+ case DW_FORM_addrx4:
attr->u.val = read_4_bytes (abfd, info_ptr, info_ptr_end);
info_ptr += 4;
break;
case DW_FORM_data8:
+ case DW_FORM_ref8:
+ case DW_FORM_ref_sig8:
attr->u.val = read_8_bytes (abfd, info_ptr, info_ptr_end);
info_ptr += 8;
break;
@@ -1265,6 +1300,33 @@ read_attribute_value (struct attribute * attr,
attr->u.str = read_alt_indirect_string (unit, info_ptr, info_ptr_end, &bytes_read);
info_ptr += bytes_read;
break;
+ case DW_FORM_strx1:
+ attr->u.val = read_1_byte (abfd, info_ptr, info_ptr_end);
+ info_ptr += 1;
+ attr->u.str = (char *) read_indexed_string (attr->u.val, unit);
+ break;
+ case DW_FORM_strx2:
+ attr->u.val = read_2_bytes (abfd, info_ptr, info_ptr_end);
+ info_ptr += 2;
+ attr->u.str = (char *) read_indexed_string (attr->u.val, unit);
+ break;
+ case DW_FORM_strx3:
+ attr->u.val = read_4_bytes (abfd, info_ptr, info_ptr_end);
+ info_ptr += 3;
+ attr->u.val &= 0xffffff;
+ attr->u.str = (char *) read_indexed_string (attr->u.val, unit);
+ break;
+ case DW_FORM_strx4:
+ attr->u.val = read_4_bytes (abfd, info_ptr, info_ptr_end);
+ info_ptr += 4;
+ attr->u.str = (char *) read_indexed_string (attr->u.val, unit);
+ break;
+ case DW_FORM_strx:
+ attr->u.val = _bfd_safe_read_leb128 (abfd, info_ptr, &bytes_read,
+ FALSE, info_ptr_end);
+ info_ptr += bytes_read;
+ attr->u.str = (char *) read_indexed_string (attr->u.val, unit);
+ break;
case DW_FORM_exprloc:
case DW_FORM_block:
amt = sizeof (struct dwarf_block);
@@ -1287,48 +1349,14 @@ read_attribute_value (struct attribute * attr,
info_ptr = read_n_bytes (info_ptr, info_ptr_end, blk);
attr->u.blk = blk;
break;
- case DW_FORM_data1:
- attr->u.val = read_1_byte (abfd, info_ptr, info_ptr_end);
- info_ptr += 1;
- break;
- case DW_FORM_flag:
- attr->u.val = read_1_byte (abfd, info_ptr, info_ptr_end);
- info_ptr += 1;
- break;
- case DW_FORM_flag_present:
- attr->u.val = 1;
- break;
case DW_FORM_sdata:
attr->u.sval = _bfd_safe_read_leb128 (abfd, info_ptr, &bytes_read,
TRUE, info_ptr_end);
info_ptr += bytes_read;
break;
- case DW_FORM_udata:
- attr->u.val = _bfd_safe_read_leb128 (abfd, info_ptr, &bytes_read,
- FALSE, info_ptr_end);
- info_ptr += bytes_read;
- break;
- case DW_FORM_ref1:
- attr->u.val = read_1_byte (abfd, info_ptr, info_ptr_end);
- info_ptr += 1;
- break;
- case DW_FORM_ref2:
- attr->u.val = read_2_bytes (abfd, info_ptr, info_ptr_end);
- info_ptr += 2;
- break;
- case DW_FORM_ref4:
- attr->u.val = read_4_bytes (abfd, info_ptr, info_ptr_end);
- info_ptr += 4;
- break;
- case DW_FORM_ref8:
- attr->u.val = read_8_bytes (abfd, info_ptr, info_ptr_end);
- info_ptr += 8;
- break;
- case DW_FORM_ref_sig8:
- attr->u.val = read_8_bytes (abfd, info_ptr, info_ptr_end);
- info_ptr += 8;
- break;
case DW_FORM_ref_udata:
+ case DW_FORM_udata:
+ case DW_FORM_addrx:
attr->u.val = _bfd_safe_read_leb128 (abfd, info_ptr, &bytes_read,
FALSE, info_ptr_end);
info_ptr += bytes_read;
@@ -1361,6 +1389,7 @@ read_attribute_value (struct attribute * attr,
info_ptr = read_n_bytes (info_ptr, info_ptr_end, blk);
attr->u.blk = blk;
break;
+
default:
_bfd_error_handler (_("DWARF error: invalid or unhandled FORM value: %#x"),
form);
|
