ctfconvert: Handle DW_AT_data_bit_offset

This attribute is new in DWARF 4 and supersedes DW_AT_bit_offset.

PR: 276059
Reported by: rscheff
Tested by: rscheff
MFC after: 1 week

ctfconvert: Integer encoding types are unsigned

Before this change, encodings in the user-defined range were being
sign-extended.

MFC after: 1 week
Sponsored by: Innovate UK

ctfconvert: Actually use the asprintf() helper

Fixes: 1165fc9a5266 ("ctfconvert: Give bitfield types names distinct from the base type")

ctfconvert: Give bitfield types names distinct from the base type

CTF integers have an explicit width and so can be used to represent
bitfields. Bitfield types emitted by ctfconvert(1) share the na

ctfconvert: Give bitfield types names distinct from the base type

CTF integers have an explicit width and so can be used to represent
bitfields. Bitfield types emitted by ctfconvert(1) share the name of
the base integer type, so a struct field with type "unsigned int : 15"
will have a type named "unsigned int".

To avoid ambiguity when looking up types by name, add a suffix to names
of bitfield types to distinguish them from the base type. Then, if
ctfmerge happens to order bitfield types before the corresponding base
type in a CTF file, a name lookup will return the base type, which is
always going to be the desired behaviour.

PR: 265403
Reported by: cy
MFC after: 1 week
Sponsored by: The FreeBSD Foundation

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ctfconvert: Handle arrays of empty structs

Members with such a type will legitimately have a size of zero, so don't
emit a warning.

PR: 260818
Reviewed by: bz
MFC after: 1 week
Sponsored by: The F

ctfconvert: Handle arrays of empty structs

Members with such a type will legitimately have a size of zero, so don't
emit a warning.

PR: 260818
Reviewed by: bz
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D33700

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MFhead@r344786

Merge ^/head r344513 through r344548.

Increase ctfconvert buffer size

Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D19353

Process CUs with a language attribute of DW_LANG_Mips_Assembler.

At the moment ctfconvert(1) does not do much with such CUs, but
that may not be true in the future, and we run ctfconvert on several

Process CUs with a language attribute of DW_LANG_Mips_Assembler.

At the moment ctfconvert(1) does not do much with such CUs, but
that may not be true in the future, and we run ctfconvert on several
assembly files during the build.

X-MFC with: r334883

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Don't process DWARF generated from non-C/C++ code.

ctfconvert(1) is not designed to handle DWARF generated from such code,
and will generally fail in non-obvious ways. Use an explicit check to
help

Don't process DWARF generated from non-C/C++ code.

ctfconvert(1) is not designed to handle DWARF generated from such code,
and will generally fail in non-obvious ways. Use an explicit check to
help catch such potential failures.

Reported by: Johannes Lundberg <johalun0@gmail.com>
MFC after: 2 weeks

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ctf dwarf: don't report "no dwarf entry" as if it were an error

ctfconvert/ctfmerge: Fix a memory leak enumerating DWARF files

Reported by: Coverity
Sponsored by: Dell EMC Isilon

Merge ^/head r309263 through r309518.

Revert r253678, r253661:
Fix a segfault in ctfmerge(1) due to a bug in GCC.

The change was correct and the bug real, but upstream didn't adopt it
and we want to remain in sync. When/if upstream does

Revert r253678, r253661:
Fix a segfault in ctfmerge(1) due to a bug in GCC.

The change was correct and the bug real, but upstream didn't adopt it
and we want to remain in sync. When/if upstream does something about it
we can bring their version.

The bug in question was fixed in GCC 4.9 which is now the default in
FreeBSD's ports. Our native gcc-4.2, which is still in use in some Tier-2
platforms also has a workaround so no end-user should be harmed by the
revert.

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Merge ^/head r303250 through r304235.

MFhead @ r304061

Fix handling of forward enum declarations in the CTF tools.

Reported by: mmacy
MFC after: 2 weeks

MFH r289384-r293170

Sponsored by: The FreeBSD Foundation

Catch up with head (r291075).

Merge from head

Merge from head

Sponsored by: Gandi.net

DWARF emitted by clang 3.7 encodes array sizes using the DW_AT_count
attribute rather than DW_AT_upper_bound. Teach ctfconvert about this so that
array type sizes are encoded correctly.

PR: 203772

DWARF emitted by clang 3.7 encodes array sizes using the DW_AT_count
attribute rather than DW_AT_upper_bound. Teach ctfconvert about this so that
array type sizes are encoded correctly.

PR: 203772
MFC after: 1 week

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Merge sync of head

MFhead @ r277403

Reintegrate head: r274132-r277384

Sponsored by: The FreeBSD Foundation