diff options
| author | Mark Wielaard <mark@klomp.org> | 2018-03-01 00:14:52 +0100 |
|---|---|---|
| committer | Mark Wielaard <mark@klomp.org> | 2018-03-05 15:30:22 +0100 |
| commit | fd0cee63fb02455a5021ca298da8dadb4df63a9a (patch) | |
| tree | bc8c9b63a31cf1a8c4b9e96b9f8013e8ea3ef149 /libdw | |
| parent | 22e282071021fc5ada2b9294bfa7e25fbd62a9d6 (diff) | |
| download | elfutils-fd0cee63fb02455a5021ca298da8dadb4df63a9a.tar.gz | |
readelf: Add some support for locviews.
This adds minimal support for locviews as output by GCC8.
It changes readelf to keep track of loclistptrs from DW_AT_GNU_locviews
and prints the locview pairs for those. Since there is no terminator
we have to keep track of where the next loclist entry starts.
The --debug-dump=loc output looks as follows:
CU [ 714] base: +0x0000000000003020 <elf_hash>
[ b4] view pair 1, 2
[ b6] range 4, 7f
+0x0000000000003024 <elf_hash+0x4>..
+0x000000000000309e <elf_hash+0x7e>
[ 0] reg5
[ d9] view pair 3, 1
view pair 1, 2
[ dd] range 4, 4c
+0x0000000000003024 <elf_hash+0x4>..
+0x000000000000306b <elf_hash+0x4b>
[ 0] reg5
range 4c, 7f
+0x000000000000306c <elf_hash+0x4c>..
+0x000000000000309e <elf_hash+0x7e>
[ 0] reg2
Note that in the above output the view pairs correspond to the ranges
immediately following in the loc list. This is how GCC8 currently
outputs the locview pairs and ranges, but this is not guaranteed and
you'll need to look at the location and GNU_locviews attributes of the
DIE to know which really match up together. We might want to adjust the
output to make this more clear.
This does not yet add an locview accessor to libdw. It just recognizes
the DW_AT_GNU_locviews attribute as a loclistptr when encoded as a
sec_offset form.
Signed-off-by: Mark Wielaard <mark@klomp.org>
Diffstat (limited to 'libdw')
| -rw-r--r-- | libdw/ChangeLog | 6 | ||||
| -rw-r--r-- | libdw/dwarf.h | 2 | ||||
| -rw-r--r-- | libdw/dwarf_formudata.c | 1 |
3 files changed, 9 insertions, 0 deletions
diff --git a/libdw/ChangeLog b/libdw/ChangeLog index b86fb13f..4c3587b4 100644 --- a/libdw/ChangeLog +++ b/libdw/ChangeLog @@ -1,3 +1,9 @@ +2018-03-01 Mark Wielaard <mark@klomp.org> + + * dwarf.h: Add DW_AT_GNU_locviews and DW_AT_GNU_entry_view. + * dwarf_formudata.c (dwarf_formudata): Handle DW_AT_GNU_locviews + as a loclistptr. + 2018-02-09 Mark Wielaard <mark@klomp.org> * dwarf_formblock.c (dwarf_formblock): Handle DW_FORM_data16 as a diff --git a/libdw/dwarf.h b/libdw/dwarf.h index 4f362066..d53a30d8 100644 --- a/libdw/dwarf.h +++ b/libdw/dwarf.h @@ -339,6 +339,8 @@ enum DW_AT_GNU_all_tail_call_sites = 0x2116, DW_AT_GNU_all_call_sites = 0x2117, DW_AT_GNU_all_source_call_sites = 0x2118, + DW_AT_GNU_locviews = 0x2137, + DW_AT_GNU_entry_view = 0x2138, DW_AT_GNU_macros = 0x2119, DW_AT_GNU_deleted = 0x211a, diff --git a/libdw/dwarf_formudata.c b/libdw/dwarf_formudata.c index 9c1644ef..95872d6b 100644 --- a/libdw/dwarf_formudata.c +++ b/libdw/dwarf_formudata.c @@ -141,6 +141,7 @@ dwarf_formudata (Dwarf_Attribute *attr, Dwarf_Word *return_uval) case DW_AT_string_length: case DW_AT_use_location: case DW_AT_vtable_elem_location: + case DW_AT_GNU_locviews: /* loclistptr */ if (__libdw_formptr (attr, IDX_debug_loc, DWARF_E_NO_LOCLIST, NULL, |