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Older (pre-upstreaming) GCC emits a function symtypetab section of a
format never read by any extant libctf. We can detect such CTF dicts by
the lack of the CTF_F_NEWFUNCINFO flag in their header, and we do so
when reading in the symtypetab section -- but if the set of symbols with
types is sufficiently sparse, even an older GCC will emit a function
index section.
In NEWFUNCINFO-capable compilers, this section will always be the exact
same length as the corresponding function section (each is an array of
uint32_t, associated 1:1 with each other). But this is not true for the
older compiler, for which the sections are different lengths. We check
to see if the function symtypetab section and its index are the same
length, but we fail to skip this check when this is not a NEWFUNCINFO
dict, and emit a spurious corruption error for a CTF dict we could
have perfectly well opened and used.
Fix trivial: check the flag (and fix the terrible grammar of the error
message at the same time).
libctf/ChangeLog
2021-09-27 Nick Alcock <nick.alcock@oracle.com>
* ctf-open.c (ctf_bufopen_internal): Don't complain about corrupt
function index symtypetab sections if this is an old-format
function symtypetab section (which should be ignored in any case).
Fix bad grammar.
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(including sim/, which has no changelog.)
bfd/ChangeLog
2021-09-27 Nick Alcock <nick.alcock@oracle.com>
* configure: Regenerate.
binutils/ChangeLog
2021-09-27 Nick Alcock <nick.alcock@oracle.com>
* configure: Regenerate.
gas/ChangeLog
2021-09-27 Nick Alcock <nick.alcock@oracle.com>
* configure: Regenerate.
gprof/ChangeLog
2021-09-27 Nick Alcock <nick.alcock@oracle.com>
* configure: Regenerate.
ld/ChangeLog
2021-09-27 Nick Alcock <nick.alcock@oracle.com>
* configure: Regenerate.
libctf/ChangeLog
2021-09-27 Nick Alcock <nick.alcock@oracle.com>
* configure: Regenerate.
* Makefile.in: Regenerate.
opcodes/ChangeLog
2021-09-27 Nick Alcock <nick.alcock@oracle.com>
* configure: Regenerate.
zlib/ChangeLog
2021-09-27 Nick Alcock <nick.alcock@oracle.com>
* configure: Regenerate.
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Checking for linker versioning by just grepping ld --help output for
mentions of --version-script is inadequate now that Solaris 11.4
implements a --version-script with different semantics. Try linking a
test program with a small wildcard-using version script with each
supported set of flags in turn, to make sure that linker versioning is
not only advertised but actually works.
The Solaris "GNU-compatible" linker versioning is not quite
GNU-compatible enough, but we can work around the differences by
generating a new version script that removes the comments from the
original (Solaris ld requires #-style comments), and making another
version script for libctf-nonbfd in particular which doesn't mention any
of the symbols that appear in libctf.la, to avoid Solaris ld introducing
corresponding new NOTYPE symbols to match the version script.
libctf/ChangeLog
2021-09-27 Nick Alcock <nick.alcock@oracle.com>
PR libctf/27967
* configure.ac (VERSION_FLAGS): Replace with...
(ac_cv_libctf_version_script): ... this multiple test.
(VERSION_FLAGS_NOBFD): Substitute this too.
* Makefile.am (libctf_nobfd_la_LDFLAGS): Use it. Split out...
(libctf_ldflags_nover): ... non-versioning flags here.
(libctf_la_LDFLAGS): Use it.
* libctf.ver: Give every symbol not in libctf-nobfd a comment on
the same line noting as much.
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Libtool needs to get BSD-format (or MS-format) output out of the system
nm, so that it can scan generated object files for symbol names for
-export-symbols-regex support. Some nms need specific flags to turn on
BSD-formatted output, so libtool checks for this in its AC_PATH_NM.
Unfortunately the code to do this has a pair of interlocking flaws:
- it runs the test by doing an nm of /dev/null. Some platforms
reasonably refuse to do an nm on a device file, but before now this
has only been worked around by assuming that the error message has a
specific textual form emitted by Tru64 nm, and that getting this
error means this is Tru64 nm and that nm -B would work to produce
BSD-format output, even though the test never actually got anything
but an error message out of nm -B. This is fixable by nm'ing *nm
itself* (since we necessarily have a path to it).
- the test is entirely skipped if NM is set in the environment, on the
grounds that the user has overridden the test: but the user cannot
reasonably be expected to know that libtool wants not only nm but
also flags forcing BSD-format output. Worse yet, one such "user" is
the top-level Cygnus configure script, which neither tests for
nor specifies any BSD-format flags. So platforms needing BSD-format
flags always fail to set them when run in a Cygnus tree, breaking
-export-symbols-regex on such platforms. Libtool also needs to
augment $LD on some platforms, but this is done unconditionally,
augmenting whatever the user specified: the nm check should do the
same.
One wrinkle: if the user has overridden $NM, a path might have been
provided: so we use the user-specified path if there was one, and
otherwise do the path search as usual. (If the nm specified doesn't
work, this might lead to a few extra pointless path searches -- but
the test is going to fail anyway, so that's not a problem.)
(Tested with NM unset, and set to nm, /usr/bin/nm, my-nm where my-nm is a
symlink to /usr/bin/nm on the PATH, and /not-on-the-path/my-nm where
*that* is a symlink to /usr/bin/nm.)
ChangeLog
2021-09-27 Nick Alcock <nick.alcock@oracle.com>
PR libctf/27967
* libtool.m4 (LT_PATH_NM): Try BSDization flags with a user-provided
NM, if there is one. Run nm on itself, not on /dev/null, to avoid
errors from nms that refuse to work on non-regular files. Remove
other workarounds for this problem. Strip out blank lines from the
nm output.
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This reports common symbols like GNU nm, via a type code of 'C'.
ChangeLog
2021-09-27 Nick Alcock <nick.alcock@oracle.com>
PR libctf/27967
* libtool.m4 (lt_cv_sys_global_symbol_pipe): Augment symcode for
Solaris 11.
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This ensures that the CTF_LIBADD, which always contains at least this
when doing a shared link:
-L`pwd`/../libiberty/pic -liberty
appears in the link line before any requirements pulled in by libbfd.la,
which include -liberty but because it is install-time do not include the
-L`pwd`/../libiberty/pic portion (in an indirect dep like this, the path
comes from the libbfd.la file, and is an install path). libiberty also
appears after libbfd in the link line by virtue of libctf-nobfd.la,
because libctf-nobfd has to follow libbfd in the link line, and that
needs symbols from libiberty too.
Without this, an installed liberty might well be pulled in by libbfd,
and if --enable-install-libiberty is not specified this libiberty might
be completely incompatible with what is being installed and break either
or boht of libbfd and libctf. (The specific problem observed here is
that bsearch_r was not present, but other problems might easily be
observed in future too.)
Because ld links against libctf, this has a tendency to break the system
linker at install time too, if installing with --prefix=/usr. That's
quite unpleasant to recover from.
libctf/ChangeLog
2021-09-27 Nick Alcock <nick.alcock@oracle.com>
PR libctf/27360
* Makefile.am (libctf_la_LIBADD): Link against libiberty
before pulling in libbfd.la or pulling in libctf-nobfd.la.
* Makefile.in: Regenerate.
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When building g++-4.8, we run into:
...
src/gdb/dwarf2/read.c:919:5: error: multiple fields in union \
'partial_die_info::<anonymous union>' initialized
...
This is due to:
...
union
{
struct
{
CORE_ADDR lowpc = 0;
CORE_ADDR highpc = 0;
};
ULONGEST ranges_offset;
};
...
The error looks incorrect, given that only one union member is initialized,
and does not reproduce with newer g++.
Nevertheless, work around this by moving the initialization to a constructor.
[ I considered just removing the initialization, with the idea that access
should be guarded by has_pc_info, but I ran into one failure in the testsuite,
for gdb.base/check-psymtab.exp due to add_partial_symbol using lowpc without
checking has_pc_info. ]
Tested on x86_64-linux.
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In some situations it is possible that a user might not want GDB to
try and access source code files, for example, the source code might
be stored on a slow to access network file system.
It is almost certainly possible that using some combination of 'set
directories' and/or 'set substitute-path' a user can trick GDB into
being unable to find the source files, but this feels like a rather
crude way to solve the problem.
In this commit a new option is add that stops GDB from opening and
reading the source files. A user can run with source code reading
disabled if this is required, then re-enable later if they decide
that they now want to view the source code.
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For some reason we have two locations where cmd_list_elements are
declared, cli/cli-cmds.h and gdbcmd.h. Worse still there is
duplication between these two locations.
In this commit I have moved all of the cmd_list_element declarations
from gdbcmd.h into cli/cli-cmds.h and removed the duplicates.
There should be no user visible changes after this commit.
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I ran into this assertion while GDB was trying to unwind the stack:
gdb/inline-frame.c:173: internal-error: void inline_frame_this_id(frame_info*, void**, frame_id*): Assertion `frame_id_p (*this_id)' failed.
That is, when building the frame_id for an inline frame, GDB asks for
the frame_id of the previous frame. Unfortunately, no valid frame_id
was returned for the previous frame, and so the assertion triggers.
What is happening is this, I had a stack that looked something like
this (the arrows '->' point from caller to callee):
normal_frame -> inline_frame
However, for whatever reason (e.g. broken debug information, or
corrupted stack contents in the inferior), when GDB tries to unwind
"normal_frame", it ends up getting back effectively the same frame,
thus the call stack looks like this to GDB:
.-> normal_frame -> inline_frame
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'-----'
Given such a situation we would expect GDB to terminate the stack with
an error like this:
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
However, the inline_frame causes a problem, and here's why:
When unwinding we start from the sentinel frame and call
get_prev_frame. We eventually end up in get_prev_frame_if_no_cycle,
in here we create a raw frame, and as this is frame #0 we immediately
return.
However, eventually we will try to unwind the stack further. When we
do this we inevitably needing to know the frame_id for frame #0, and
so, eventually, we end up in compute_frame_id.
In compute_frame_id we first find the right unwinder for this frame,
in our case (i.e. for inline_frame) the $pc is within the function
normal_frame, but also within a block associated with the inlined
function inline_frame, as such the inline frame unwinder claims this
frame.
Back in compute_frame_id we next compute the frame_id, for our
inline_frame this means a call to inline_frame_this_id.
The ID of an inline frame is based on the id of the previous frame, so
from inline_frame_this_id we call get_prev_frame_always, this
eventually calls get_prev_frame_if_no_cycle again, which creates
another raw frame and calls compute_frame_id (for frames other than
frame 0 we immediately compute the frame_id).
In compute_frame_id we again identify the correct unwinder for this
frame. Our $pc is unchanged, however, the fact that the next frame is
of type INLINE_FRAME prevents the inline frame unwinder from claiming
this frame again, and so, the standard DWARF frame unwinder claims
normal_frame.
We return to compute_frame_id and call the standard DWARF function to
build the frame_id for normal_frame.
With the frame_id of normal_frame figured out we return to
compute_frame_id, and then to get_prev_frame_if_no_cycle, where we add
the ID for normal_frame into the frame_id cache, and return the frame
back to inline_frame_this_id.
From inline_frame_this_id we build a frame_id for inline_frame and
return to compute_frame_id, and then to get_prev_frame_if_no_cycle,
which adds the frame_id for inline_frame into the frame_id cache.
So far, so good.
However, as we are trying to unwind the complete stack, we eventually
ask for the previous frame of normal_frame, remember, at this point
GDB doesn't know the stack is corrupted (with a cycle), GDB still
needs to figure that out.
So, we eventually end up in get_prev_frame_if_no_cycle where we create
a raw frame and call compute_frame_id, remember, this is for the frame
before normal_frame.
The first task for compute_frame_id is to find the unwinder for this
frame, so all of the frame sniffers are tried in order, this includes
the inline frame sniffer.
The inline frame sniffer asks for the $pc, this request is sent up the
stack to normal_frame, which, due to its cyclic behaviour, tells GDB
that the $pc in the previous frame was the same as the $pc in
normal_frame.
GDB spots that this $pc corresponds to both the function normal_frame
and also the inline function inline_frame. As the next frame is not
an INLINE_FRAME then GDB figures that we have not yet built a frame to
cover inline_frame, and so the inline sniffer claims this new frame.
Our stack is now looking like this:
inline_frame -> normal_frame -> inline_frame
But, we have not yet computed the frame id for the outer most (on the
left) inline_frame. After the frame sniffer has claimed the inline
frame GDB returns to compute_frame_id and calls inline_frame_this_id.
In here GDB calls get_prev_frame_always, which eventually ends up
in get_prev_frame_if_no_cycle again, where we create a raw frame and
call compute_frame_id.
Just like before, compute_frame_id tries to find an unwinder for this
new frame, it sees that the $pc is within both normal_frame and
inline_frame, but the next frame is, again, an INLINE_FRAME, so, just
like before the standard DWARF unwinder claims this frame. Back in
compute_frame_id we again call the standard DWARF function to build
the frame_id for this new copy of normal_frame.
At this point the stack looks like this:
normal_frame -> inline_frame -> normal_frame -> inline_frame
After compute_frame_id we return to get_prev_frame_if_no_cycle, where
we try to add the frame_id for the new normal_frame into the frame_id
cache, however, unlike before, we fail to add this frame_id as it is
a duplicate of the previous normal_frame frame_id. Having found a
duplicate get_prev_frame_if_no_cycle unlinks the new frame from the
stack, and returns nullptr, the stack now looks like this:
inline_frame -> normal_frame -> inline_frame
The nullptr result from get_prev_frame_if_no_cycle is fed back to
inline_frame_this_id, which forwards this to get_frame_id, which
immediately returns null_frame_id. As null_frame_id is not considered
a valid frame_id, this is what triggers the assertion.
In summary then:
- inline_frame_this_id currently assumes that as the inline frame
exists, we will always get a valid frame back from
get_prev_frame_always,
- get_prev_frame_if_no_cycle currently assumes that it is safe to
return nullptr when it sees a cycle.
Notice that in frame.c:compute_frame_id, this code:
fi->this_id.value = outer_frame_id;
fi->unwind->this_id (fi, &fi->prologue_cache, &fi->this_id.value);
gdb_assert (frame_id_p (fi->this_id.value));
The assertion makes it clear that the this_id function must always
return a valid frame_id (e.g. null_frame_id is not a valid return
value), and similarly in inline_frame.c:inline_frame_this_id this
code:
*this_id = get_frame_id (get_prev_frame_always (this_frame));
/* snip comment */
gdb_assert (frame_id_p (*this_id));
Makes it clear that every inline frame expects to be able to get a
previous frame, which will have a valid frame_id.
As I have discussed above, these assumptions don't currently hold in
all cases.
One possibility would be to move the call to get_prev_frame_always
forward from inline_frame_this_id to inline_frame_sniffer, however,
this falls foul of (in frame.c:frame_cleanup_after_sniffer) this
assertion:
/* No sniffer should extend the frame chain; sniff based on what is
already certain. */
gdb_assert (!frame->prev_p);
This assert prohibits any sniffer from trying to get the previous
frame, as getting the previous frame is likely to depend on the next
frame, I can understand why this assertion is a good thing, and I'm in
no rush to alter this rule.
The solution proposed here takes onboard feedback from both Pedro, and
Simon (see the links below). The get_prev_frame_if_no_cycle function
is renamed to get_prev_frame_maybe_check_cycle, and will now not do
cycle detection for inline frames, even when we spot a duplicate frame
it is still returned. This is fine, as, if the normal frame has a
duplicate frame-id then the inline frame will also have a duplicate
frame-id. And so, when we reject the inline frame, the duplicate
normal frame, which is previous to the inline frame, will also be
rejected.
In inline-frame.c the call to get_prev_frame_always is no longer
nested inside the call to get_frame_id. There are reasons why
get_prev_frame_always can return nullptr, for example, if there is a
memory error while trying to get the previous frame, if this should
happen then we now give a more informative error message.
Historical Links:
Patch v2: https://sourceware.org/pipermail/gdb-patches/2021-June/180208.html
Feedback: https://sourceware.org/pipermail/gdb-patches/2021-July/180651.html
https://sourceware.org/pipermail/gdb-patches/2021-July/180663.html
Patch v3: https://sourceware.org/pipermail/gdb-patches/2021-July/181029.html
Feedback: https://sourceware.org/pipermail/gdb-patches/2021-July/181035.html
Additional input: https://sourceware.org/pipermail/gdb-patches/2021-September/182040.html
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When running test-case gdb.base/dcache-flush.exp on ubuntu 18.04.5, I run into:
...
(gdb) PASS: gdb.base/dcache-flush.exp: p var2
info dcache^M
Dcache 4096 lines of 64 bytes each.^M
Contains data for Thread 0x7ffff7fc6b80 (LWP 3551)^M
Line 0: address 0x7fffffffd4c0 [47 hits]^M
Line 1: address 0x7fffffffd500 [31 hits]^M
Line 2: address 0x7fffffffd5c0 [7 hits]^M
Cache state: 3 active lines, 85 hits^M
(gdb) FAIL: gdb.base/dcache-flush.exp: check dcache before flushing
...
The regexp expects "Contains data for process $decimal".
This is another case of thread_db_target::pid_to_str being used.
Fix this by updating the regexp.
Tested on x86_64-linux.
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gdb.threads/process-dies-while-detaching.exp
The test-case gdb.threads/process-dies-while-detaching.exp takes about 20s
when using hw watchpoints, but when forcing sw watchpoints (using the patch
mentioned in PR28375#c0), the test-case takes instead 3m14s.
Also, it show a FAIL:
...
(gdb) continue^M
Continuing.^M
Cannot find user-level thread for LWP 10324: generic error^M
(gdb) FAIL: gdb.threads/process-dies-while-detaching.exp: single-process:
continue: watchpoint: continue
...
for which PR28375 was filed.
Modify the test-case to:
- add the hw/sw axis to the watchpoint testing, to ensure that we
observe the sw watchpoint behaviour also on can-use-hw-watchpoints
architectures.
- skip the hw breakpoint testing if not supported
- set the sw watchpoint later to avoid making the test
too slow. This still triggers the same PR, but now takes just 24s.
This patch adds a KFAIL for PR28375.
Tested on x86_64-linux.
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Change-Id: I7bfbb9d349a1f474256800c45e28fe3b1de08771
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SPR 896 and the mfppr mfppr32, mtppr and mtppr32 extended mnemonics were added
in ISA 2.03, so enable them on POWER5 and later.
opcodes/
* ppc-opc.c (powerpc_opcodes) <mfppr, mfppr32, mtppr, mtppr32>: Enable
on POWER5 and later.
gas/
* testsuite/gas/ppc/power5.s: New test.
* testsuite/gas/ppc/power5.d: Likewise.
* testsuite/gas/ppc/ppc.exp: Run it.
* testsuite/gas/ppc/power7.s: Remove tests for mfppr, mfppr32, mtppr
and mtppr32.
* testsuite/gas/ppc/power7.d: Likewise.
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Minimize gdb restarts, applying the following rules:
- don't use prepare_for_testing unless necessary
- don't use clean_restart unless necessary
Also, if possible, replace build_for_executable + clean_restart
with prepare_for_testing for brevity.
Touches 68 test-cases.
Tested on x86_64-linux.
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Don't attempt to access elf_section_data for non-ELF sections.
PR 28346
* elf32-xtensa.c (xtensa_read_table_entries): Return zero entries
for non-ELF.
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Required for the expected "CU:" to be emitted for long
source-paths. See binutils/dwarf.c:
if (do_wide || strlen (directory) < 76)
printf (_("CU: %s/%s:\n"), directory, file_table[0].name);
else
printf ("%s:\n", file_table[0].name);
See also commit 5f410aa50ce2c, "testsuite/ld-elf/pr26936.d:
Pass -W."
gas/ChangeLog:
* testsuite/ld-elf/dwarf2-21.d: Pass -W.
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This started out as changing thread_info::name to a unique_xmalloc_ptr.
That showed that almost all users of that field had the same logic to
get a thread's name: use thread_info::name if non-nullptr, else ask the
target. Factor out this logic in a new thread_name free function. Make
the field private (rename to m_name) and add some accessors.
Change-Id: Iebdd95f4cd21fbefc505249bd1d05befc466a2fc
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I noticed that value_true is declared in language.h and defined in
language.c. However, as part of the value API, I think it would be
better in one of those files. And, because it is very short, I
changed it to be an inline function in value.h. I've also removed a
comment from the implementation, on the basis that it seems obsolete
-- if the change it suggests was needed, it probably would have been
done by now; and if it is needed in the future, odds are it would be
done differently anyway.
Finally, this patch also changes value_true and value_logical_not to
return a bool, and updates some uses.
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By inspection, I noticed that this code in dcache.c is not
multi-target-aware:
/* If this is a different inferior from what we've recorded,
flush the cache. */
if (inferior_ptid != dcache->ptid)
This doesn't take into account that threads of different targets may
have the same ptid.
Fixed by also storing/comparing the process_stratum_target.
Tested on x86-64-linux-gnu, native and gdbserver.
Change-Id: I4d9d74052c696b72d28cb1c77b697b911725c8d3
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We currently have one FAIL while running "make check-perf":
PerfTest::assemble, run ...
python Disassemble().run()
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/home/pedro/rocm/gdb/src/gdb/testsuite/gdb.perf/lib/perftest/perftest.py", line 64, in run
self.warm_up()
File "<string>", line 25, in warm_up
gdb.error: No symbol "ada_evaluate_subexp" in current context.
Error while executing Python code.
(gdb) FAIL: gdb.perf/disassemble.exp: python Disassemble().run()
...
The gdb.perf/disassemble.exp testcase debugs GDB with itself, runs to
main, and then disassembles a few GDB functions. The problem is that
most(!) functions it is trying to disassemble are now gone...
This commit fixes the issue by simply picking some other functions to
disassemble.
It would perhaps be better to come up with some test program to
disassemble, one that would stay the same throughout the years,
instead of disassembling GDB itself. I don't know why that wasn't
done to begin with. I'll have to leave that for another rainy day,
though.
gdb/testsuite/
yyyy-mm-dd Pedro Alves <pedro@palves.net>
* gdb.perf/disassemble.py (Disassemble::warm_up): Disassemble
evaluate_subexp_do_call instead of ada_evaluate_subexp.
(Disassemble::warm_up): Disassemble "captured_main",
"run_inferior_call" and "update_global_location_list" instead of
"evaluate_subexp_standard" and "c_parse_internal".
Change-Id: I89d1cca89ce2e495dea5096e439685739cc0d3df
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Currently "make check-perf" triggers ~40 PATH messages in gdb.sum:
...
PATH: gdb.perf/backtrace.exp: python sys.path.insert(0, os.path.abspath("/home/pedro/rocm/gdb/build/gdb/../../src/gdb/testsuite/gdb.perf/lib"))
PATH: gdb.perf/backtrace.exp: python exec (open ('/home/pedro/rocm/gdb/build/gdb/testsuite/outputs/gdb.perf/backtrace/backtrace.py').read ())
...
This commit fixes them. E.g. before/after gdb.sum diff:
-PASS: gdb.perf/backtrace.exp: python import os, sys
-PASS: gdb.perf/backtrace.exp: python sys.path.insert(0, os.path.abspath("/home/pedro/rocm/gdb/build-master/gdb/../../src/gdb/testsuite/gdb.perf/lib"))
-PATH: gdb.perf/backtrace.exp: python sys.path.insert(0, os.path.abspath("/home/pedro/rocm/gdb/build-master/gdb/../../src/gdb/testsuite/gdb.perf/lib"))
-PASS: gdb.perf/backtrace.exp: python exec (open ('/home/pedro/rocm/gdb/build-master/gdb/testsuite/outputs/gdb.perf/backtrace/backtrace.py').read ())
-PATH: gdb.perf/backtrace.exp: python exec (open ('/home/pedro/rocm/gdb/build-master/gdb/testsuite/outputs/gdb.perf/backtrace/backtrace.py').read ())
+PASS: gdb.perf/backtrace.exp: setup perftest: python import os, sys
+PASS: gdb.perf/backtrace.exp: setup perftest: python sys.path.insert(0, os.path.abspath("${srcdir}/gdb.perf/lib"))
+PASS: gdb.perf/backtrace.exp: setup perftest: python exec (open ('${srcdir}/gdb.perf/backtrace.py').read ())
gdb/testsuite/
yyyy-mm-dd Pedro Alves <pedro@palves.net>
* lib/perftest.exp (PerfTest::_setup_perftest): Use
with_test_prefix. Add explicit test names to python invocations,
with "$srcdir" not expanded.
Change-Id: I50a31b04b7abdea754139509e4a34ae9263118a4
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Currently running "make check-perf" shows:
...
# of duplicate test names 6008
...
All those duplicate test names come from gdb.perf/skip-command.exp.
This commit fixes them, using with_test_prefix.
gdb/testsuite/
yyyy-mm-dd Pedro Alves <pedro@palves.net>
* gdb.perf/skip-command.exp (run_skip_bench): Wrap each for
iteration in with_test_prefix.
Change-Id: I38501cf70bc6b60306ee7228996ee7bcd858dc1b
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A newer version of GCC will now emit member locations using just
DW_AT_data_bit_offset, like:
<3><14fe>: Abbrev Number: 1 (DW_TAG_member)
<14ff> DW_AT_name : (indirect string, offset: 0x215e): nb_bytes
<1503> DW_AT_decl_file : 1
<1503> DW_AT_decl_line : 10
<1504> DW_AT_decl_column : 7
<1505> DW_AT_type : <0x150b>
<1509> DW_AT_bit_size : 31
<150a> DW_AT_data_bit_offset: 64
whereas earlier versions would emit something like:
<3><164f>: Abbrev Number: 7 (DW_TAG_member)
<1650> DW_AT_name : (indirect string, offset: 0x218d): nb_bytes
<1654> DW_AT_decl_file : 1
<1655> DW_AT_decl_line : 10
<1656> DW_AT_decl_column : 7
<1657> DW_AT_type : <0x165f>
<165b> DW_AT_byte_size : 4
<165c> DW_AT_bit_size : 31
<165d> DW_AT_bit_offset : 1
<165e> DW_AT_data_member_location: 8
That is, DW_AT_data_member_location is not emitted any more. This is
a change due to the switch to DWARF 5 by default.
This change pointed out an existing bug in gdb, namely that the
attr_to_dynamic_prop depends on the presence of
DW_AT_data_member_location. This patch moves the handling of
DW_AT_data_bit_offset into handle_data_member_location, and updates
attr_to_dynamic_prop to handle this new case.
A new test case is included. This test fails with GCC 11, but passes
with an earlier version of GCC.
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A typical dwarf assembly test-case start like this:
...
standard_testfile .c -debug.S
set asm_file [standard_output_file $srcfile2]
Dwarf::assemble $asm_file {
...
}
if { [prepare_for_testing "failed to prepare" ${testfile} \
[list $srcfile $asm_file] {nodebug}] } {
return -1
}
...
When accidentally using build_for_executable instead of
prepare_for_testing (or intentionally using it but forgetting to add
clean_restart $binfile or some such) the mistake may not be caught, because
another gdb instance is still running, and we may silently end up testing
compiler-generated DWARF.
This can be caused by something relatively obvious, like an earlier
prepare_for_testing or clean_restart, but also by something more obscure like
function_range, which may even be triggered by dwarf assembly like this:
...
{MACRO_AT_func {main}}
...
Fix this by calling gdb_exit at the end of function_range.
Also fix the fallout of that in test-case gdb.dwarf2/dw2-bad-elf.exp, where a
get_sizeof call used the gdb instance left lingering by function_range.
[ A better and more complete fix would add a new proc get_exec_info, that would
be called at the start of the dwarf assembly body:
...
Dwarf::assemble $asm_file {
get_exec_info {main foo} {int void*}
...
that would:
- do a prepare_for_testing with $srcfile (roughtly equivalent to what
MACRO_AT_func does,
- call function_range for all functions main and foo, without starting a
new gdb instance
- set corresponding variables at the call-site: main_start, main_len,
main_end, foo_start, foo_len, foo_end.
- get size for types int and void*
- set corresponding variables at the call-site: int_size, void_ptr_size.
- do a gdb_exit. ]
Tested on x86_64-linux.
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I noticed two test-cases where -fpie is used. Using the canonical pie option
will usually get one -fPIE instead.
That choice is justified here in gdb_compile:
...
# For safety, use fPIE rather than fpie. On AArch64, m68k, PowerPC
# and SPARC, fpie can cause compile errors due to the GOT exceeding
# a maximum size. On other architectures the two flags are
# identical (see the GCC manual). Note Debian9 and Ubuntu16.10
# onwards default GCC to using fPIE. If you do require fpie, then
# it can be set using the pie_flag.
set flag "additional_flags=-fPIE"
...
There is no indication that using -fpie rather than -fPIE is on purpose, so
use pie instead.
Tested on x86_64-linux.
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Factor out new proc dump_info in test-case gdb.testsuite/dump-system-info.exp,
and in the process:
- fix a few typos
- remove unnecessary "test -r /proc/cpuinfo"
Tested on x86_64-linux.
Co-Authored-By: Pedro Alves <pedro@palves.net>
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It is currently not possible to use variables in locations lists. For
example, with:
diff --git a/gdb/testsuite/gdb.dwarf2/loclists-multiple-cus.exp b/gdb/testsuite/gdb.dwarf2/loclists-multiple-cus.exp
index 6b4f5c8cbb8..cdbf948619f 100644
--- a/gdb/testsuite/gdb.dwarf2/loclists-multiple-cus.exp
+++ b/gdb/testsuite/gdb.dwarf2/loclists-multiple-cus.exp
@@ -30,6 +30,8 @@ if {![dwarf2_support]} {
return 0
}
+set myconst 0x123456
+
# Test with 32-bit and 64-bit DWARF.
foreach_with_prefix is_64 {false true} {
if { $is_64 } {
@@ -49,6 +51,7 @@ foreach_with_prefix is_64 {false true} {
global func1_addr func1_len
global func2_addr func2_len
global is_64
+ global myconst
# The CU uses the DW_FORM_loclistx form to refer to the .debug_loclists
# section.
@@ -107,7 +110,7 @@ foreach_with_prefix is_64 {false true} {
list_ {
# When in func1.
start_length $func1_addr $func1_len {
- DW_OP_constu 0x123456
+ DW_OP_constu $myconst
DW_OP_stack_value
}
we get:
$ make check TESTS="*/loclists-multiple-cus.exp"
...
gdb compile failed, build/gdb/testsuite/outputs/gdb.dwarf2/loclists-multiple-cus/loclists-multiple-cus-dw32.S: Assembler messages:
build/gdb/testsuite/outputs/gdb.dwarf2/loclists-multiple-cus/loclists-multiple-cus-dw32.S:78: Error: leb128 operand is an undefined symbol: $myconst
...
That means $myconst was copied literally to the generated assembly
file.
This patch fixes it, by running subst on the location list body, in
the context of the caller. The fix is applied to both
Dwarf::loclists::table::list_::start_length and
Dwarf::loclists::table::list_::start_end.
Reported-by: Zoran Zaric <Zoran.Zaric@amd.com>
Change-Id: I615a64431857242d9f477d5699e3732df1b31322
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When running test-case gdb.dwarf2/implptr-64bit.exp with target board
unix/-m32, I noticed:
...
DUPLICATE: gdb.dwarf2/implptr-64bit.exp: failed to prepare
...
Fix this by using with_test_prefix.
Tested on x86_64-linux.
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Fix these DUPLICATEs by using with_test_prefix:
...
DUPLICATE: gdb.dwarf2/dw2-is-stmt.exp: ensure we saw a valid line pattern, 1
DUPLICATE: gdb.dwarf2/dw2-is-stmt.exp: ensure we saw a valid line pattern, 2
...
Tested on x86_64-linux.
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When doing a testrun with:
...
$ make check RUNTESTFLAGS=$(cd $src/gdb/testsuite/; echo gdb.dwarf2/*.exp)
...
I ran into:
...
ERROR: tcl error sourcing gdb.dwarf2/dw2-is-stmt.exp.
ERROR: expected integer but got "dw2-abs-hi-pc-world.c"
while executing
"incr i"
...
The variable i is set in gdb.dwarf2/dw2-abs-hi-pc.exp, and leaks to
gdb.dwarf2/dw2-is-stmt.exp. It's not removed by gdb_cleanup_globals because i
is set as global variable by runtest.exp, which does:
...
for { set i 0 } { $i < $argc } { incr i } {
...
at toplevel but forgets to unset the variable.
Fix this by removing '$' in front of the variable name when doing set:
...
-set $i 0
+set i 0
...
Tested on x86_64-linux.
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Fix this duplicate:
...
DUPLICATE: gdb.base/load-command.exp: check initial value of the_variable
...
by using with_test_prefix.
Tested on x86_64-linux.
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I noticed two test-case that use ldflags=-pie and ldflags-no-pie, instead of
the canonical pie and nopie options, which would typically also add
additional_flags=-fPIE respectively additional_flags=-fno-pie.
There is no indication that this is on purpose, so replace these with pie and
nopie.
Tested on x86_64-linux.
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When interpreting the testsuite results, it's often relevant what kind of
machine the testsuite ran on. On a local machine one can just do
/proc/cpuinfo, but in case of running tests using a remote system
that distributes test runs to other remote systems that are not directly
accessible, that's not possible.
Fix this by dumping /proc/cpuinfo into the gdb.log, as well as lsb_release -a
and uname -a.
We could do this at the start of each test run, by putting it into unix.exp
or some such. However, this might be too verbose, so we choose to put it into
its own test-case, such that it get triggered in a full testrun, but not when
running one or a subset of tests.
We put the test-case into the gdb.testsuite directory, which is currently the
only place in the testsuite where we do not test gdb. [ Though perhaps this
could be put into a new gdb.info directory, since the test-case doesn't
actually test the testsuite. ]
Tested on x86_64-linux.
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I noticed that pointer_type is declared in language.h and defined in
language.c. However, it really has to do with types, so it should
have been in gdbtypes.h all along.
This patch changes it to be a method on struct type. And, I went
through uses of TYPE_IS_REFERENCE and updated many spots to use the
new method as well. (I didn't update ones that were in arch-specific
code, as I couldn't readily test that.)
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When running gdb.rust/*.exp test-cases with target board unix/-fPIE/-pie, I
run into:
...
builtin_spawn -ignore SIGHUP rustc --color never gdb.rust/watch.rs \
-g -lm -fPIE -pie -o outputs/gdb.rust/watch/watch^M
error: Unrecognized option: 'f'^M
^M
compiler exited with status 1
...
The problem is that -fPIE and -fpie are gcc options, but for rust we use
rustc, which has different compilation options.
Fix this by translating the gcc options to rustc options in gdb_compile_rust,
similar to how that is done for ada in target_compile_ada_from_dir.
Likewise for unix/-fno-PIE/-no-pie.
Tested on x86_64-linux, with:
- native
- unix/-fPIE/-pie
- unix/-fno-PIE/-no-pie
specifically, on openSUSE Leap 15.2 both with package gcc-PIE:
- installed (making gcc default to PIE)
- uninstalled (making gcc default to non-PIE).
and rustc 1.52.1.
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Replace {additional_flags=-fPIE ldflags=-pie} with {pie}.
This makes sure that the test-cases properly error out when using target board
unix/-fno-PIE/-no-pie.
Tested on x86_64-linux.
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When running test-case gdb.base/break-interp.exp on ubuntu 18.04.5, we have:
...
(gdb) bt^M
#0 0x00007eff7ad5ae12 in ?? () from break-interp-LDprelinkNOdebugNO^M
#1 0x00007eff7ad71f50 in ?? () from break-interp-LDprelinkNOdebugNO^M
#2 0x00007eff7ad59128 in ?? () from break-interp-LDprelinkNOdebugNO^M
#3 0x00007eff7ad58098 in ?? () from break-interp-LDprelinkNOdebugNO^M
#4 0x0000000000000002 in ?? ()^M
#5 0x00007fff505d7a32 in ?? ()^M
#6 0x00007fff505d7a94 in ?? ()^M
#7 0x0000000000000000 in ?? ()^M
(gdb) FAIL: gdb.base/break-interp.exp: ldprelink=NO: ldsepdebug=NO: \
first backtrace: dl bt
...
Using the backtrace, the test-case tries to establish that we're stopped in
dl_main.
However, the backtrace only shows an address, because:
- the dynamic linker contains no minimal symbols and no debug info, and
- gdb is build without --with-separate-debug-dir so it can't find the
corresponding .debug file, which does contain the mimimal symbols and
debug info.
As in "[gdb/testsuite] Improve probe detection in gdb.base/break-probes.exp",
fix this by doing info probes and grepping for the address.
Tested on x86_64-linux.
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When running test-case gdb.base/break-probes.exp on ubuntu 18.04.5, we have:
...
(gdb) run^M
Starting program: break-probes^M
Stopped due to shared library event (no libraries added or removed)^M
(gdb) bt^M
#0 0x00007ffff7dd6e12 in ?? () from /lib64/ld-linux-x86-64.so.2^M
#1 0x00007ffff7dedf50 in ?? () from /lib64/ld-linux-x86-64.so.2^M
#2 0x00007ffff7dd5128 in ?? () from /lib64/ld-linux-x86-64.so.2^M
#3 0x00007ffff7dd4098 in ?? () from /lib64/ld-linux-x86-64.so.2^M
#4 0x0000000000000001 in ?? ()^M
#5 0x00007fffffffdaac in ?? ()^M
#6 0x0000000000000000 in ?? ()^M
(gdb) UNSUPPORTED: gdb.base/break-probes.exp: probes not present on this system
...
Using the backtrace, the test-case tries to establish that we're stopped in
dl_main, which is used as proof that we're using probes.
However, the backtrace only shows an address, because:
- the dynamic linker contains no minimal symbols and no debug info, and
- gdb is build without --with-separate-debug-dir so it can't find the
corresponding .debug file, which does contain the mimimal symbols and
debug info.
Fix this by instead printing the pc and grepping for the value in the
info probes output:
...
(gdb) p /x $pc^M
$1 = 0x7ffff7dd6e12^M
(gdb) info probes^M
Type Provider Name Where Object ^M
...
stap rtld init_start 0x00007ffff7dd6e12 /lib64/ld-linux-x86-64.so.2 ^M
...
(gdb)
...
Tested on x86_64-linux.
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When running test-case gdb.base/break-probes.exp on ubuntu 18.04.5, we have:
...
(gdb) bt^M
#0 0x00007ffff7dd6e12 in ?? () from /lib64/ld-linux-x86-64.so.2^M
#1 0x00007ffff7dedf50 in ?? () from /lib64/ld-linux-x86-64.so.2^M
#2 0x00007ffff7dd5128 in ?? () from /lib64/ld-linux-x86-64.so.2^M
#3 0x00007ffff7dd4098 in ?? () from /lib64/ld-linux-x86-64.so.2^M
#4 0x0000000000000001 in ?? ()^M
#5 0x00007fffffffdaac in ?? ()^M
#6 0x0000000000000000 in ?? ()^M
(gdb) FAIL: gdb.base/break-probes.exp: ensure using probes
...
The test-case intends to emit an UNTESTED in this case, but fails to do so
because it tries to do it in a regexp clause in a gdb_test_multiple, which
doesn't trigger. Instead, a default clause triggers which produces the FAIL.
Also the use of UNTESTED is not appropriate, and we should use UNSUPPORTED
instead.
Fix this by silencing the FAIL, and emitting an UNSUPPORTED after the
gdb_test_multiple:
...
if { ! $using_probes } {
+ unsupported "probes not present on this system"
return -1
}
...
Tested on x86_64-linux.
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Reduce indentation and improve readability in test-case
gdb.base/break-probes.exp by replacing:
...
if { <cond> } {
<lots-of-code>
}
...
with:
...
if { ! <cond> } {
return -1
}
<lots-of-code>
...
Tested on x86_64-linux.
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This adds a testcase that tests that the unwinder produces consistent
frame info and frame IDs by making sure that "info frame" shows the
same result when stopped at a function (level == 0), compared to when
we find the same frame in the stack at a level > 0.
E.g., on x86-64, right after running to main, we see:
(gdb) info frame
Stack level 0, frame at 0x7fffffffd340:
rip = 0x555555555168 in main (gdb.base/backtrace.c:41); saved rip = 0x7ffff7dd90b3
source language c.
Arglist at 0x7fffffffd330, args:
Locals at 0x7fffffffd330, Previous frame's sp is 0x7fffffffd340
Saved registers:
rbp at 0x7fffffffd330, rip at 0x7fffffffd338
(gdb)
and then after continuing to a function called by main, and selecting
the "main" frame again, we see:
(gdb) info frame
Stack level 3, frame at 0x7fffffffd340:
rip = 0x555555555172 in main (gdb.base/backtrace.c:41); saved rip = 0x7ffff7dd90b3
caller of frame at 0x7fffffffd330
source language c.
Arglist at 0x7fffffffd330, args:
Locals at 0x7fffffffd330, Previous frame's sp is 0x7fffffffd340
Saved registers:
rbp at 0x7fffffffd330, rip at 0x7fffffffd338
(gdb)
The only differences should be in the stack level, the 'rip = '
address, and the presence of the "caller of frame at" info. All the
rest should be the same. If it isn't, it probably means that the
frame base, the frame ID, etc. aren't stable & consistent.
The testcase exercises both the DWARF and the heuristic unwinders,
using "maint set dwarf unwinder on/off".
Tested on {x86-64 -m64, x86-64 -m32, Aarch64, Power8} GNU/Linux.
Change-Id: I795001c82cc70d543d197415e3f80ce5dc7f3452
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get_ada_task_ptid currently takes a 'long' as its 'thread' parameter
type. However, on some platforms this is actually a pointer, and
using 'long' can sometimes end up with the value being sign-extended.
This sign extension can cause problems later, if the tid is then later
used as an address again.
This patch changes the parameter type to ULONGEST and updates all the
uses. This approach preserves sign extension on the targets where it
is apparently intended, while avoiding it on others.
Co-Authored-By: John Baldwin <jhb@FreeBSD.org>
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The ptid_t 'tid' member is normally used as an address in gdb -- both
bsd-uthread and ravenscar-thread use it this way. However, because
the type is 'long', this can cause problems with sign extension.
This patch changes the type to ULONGEST to ensure that sign extension
does not occur.
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I wanted to find, and potentially modify, all the spots where the
'tid' parameter to the ptid_t constructor was used. So, I temporarily
removed this parameter and then rebuilt.
In order to make it simpler to search through the "real" (nonzero)
uses of this parameter, something I knew I'd have to do multiple
times, I removed any ", 0" from constructor calls.
Co-Authored-By: John Baldwin <jhb@FreeBSD.org>
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This patch changes gdb to use the 'highlight' style on the "XXX" text
in the output of ptype/o.
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