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The attribute really specifies that the sum of register and memory
operands is 4. Express it like that in most places, while using the 2nd
(apart from XOP) CPU feature flags (FMA4) in reversed operand matching
logic.
With the use in build_modrm_byte() gone, part of an assertion there
also becomes meaningless - simplify that at the same time.
With all uses of the opcode modifier field gone, also drop that.
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The few XOP insns which used it wrongly didn't have VexVVVV specified.
With that added, the only further missing piece to use more generic code
elsewhere is SwapSources - see e.g. the BMI2 insns for similar operand
patterns.
With the only users gone, drop the #define as well as the special case
code.
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The VPROT* forms with an immediate operand are entirely standard in the
way their ModR/M bytes are built. There's no reason to invoke special
case code. With that the handling of an immediate there can also be
dropped; it was partially bogus anyway, as in its "no memory operands"
portion it ignores the possibility of an immediate operand (which was
okay only because that case was already handled by more generic code).
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This really isn't a "modifier" and rather ought to live next to the base
opcode anyway. Use the bits we presently have available to fit in the
field, renaming it to opcode_space. As an intended side effect this
helps readability at the use sites, by shortening the references quite a
bit.
In generated code arrange for human readable output, by using the
SPACE_* constants there rather than raw numbers. This may aid debugging
down the road.
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Fold adjacent comparisons when, by ORing in a certain mask, the same
effect can be achieved by a single one. In load_insn_p() this extends
to further uses of an already available local variable.
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Now that we have identifiers for the mnemonic strings we can avoid
opcode based comparisons, for (in many cases) being more expensive and
(in a few cases) being a little fragile and not self-documenting.
Note that the MOV optimization can be engaged by the earlier LEA one,
and hence LEA also needs checking for there.
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Anti-fuzzer measure. I'm not sure what the correct fix is for
objcopy. Probably the BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS,
BFD_MACH_O_S_LAZY_SYMBOL_POINTERS and BFD_MACH_O_S_SYMBOL_STUBS
contents should be read.
* mach-o.c (bfd_mach_o_section_get_nbr_indirect): Omit sections
with NULL sec->indirect_syms.
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I've found that I often use dwarf-mode with relatively small test
files. In this situation, it's handy to be able to expand all the
DWARF, rather than moving to each "..." separately and using C-u C-m.
This patch implements this feature. It also makes a couple of other
minor changes:
* I removed a stale FIXME from dwarf-mode. In practice I find I often
use "g" to restore the buffer to a pristine state; checking the file
mtime would work against this.
* I tightened the regexp in dwarf-insert-substructure. This prevents
the C-m binding from trying to re-read a DIE which has already been
expanded.
* Finally, I've bumped the dwarf-mode version number so that this
version can easily be installed using package.el.
2023-02-09 Tom Tromey <tromey@adacore.com>
* dwarf-mode.el: Bump version to 1.8.
(dwarf-insert-substructure): Tighten regexp.
(dwarf-refresh-all): New defun.
(dwarf-mode-map): Bind "A" to dwarf-refresh-all.
(dwarf-mode): Remove old FIXME.
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gdb.rust/fnfield.exp has a comment that, I assume, I copied from some
other test. This patch fixes it.
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rust_language::print_enum computes:
int nfields = variant_type->num_fields ();
... but then does not reuse this in one spot. This patch corrects the
oversight.
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Clang doesn't accept initializer syntax for variable-length
arrays in C. Just use memset instead.
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The command has no effect for the loading of GDB pretty printers and is
removed by this patch to avoid confusion.
Documentation for "set print pretty"
"Cause GDB to print structures in an indented format with one member per line"
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main_type::nfields is a 'short', and has been for many years. PR
c++/29985 points out that 'short' is too narrow for an enum that
contains more than 2^15 constants.
This patch bumps the size of 'nfields'. To verify that the field
isn't directly used, it is also renamed. Note that this does not
affect the size of main_type on x86-64 Fedora 36. And, if it does
have a negative effect somewhere, it's worth considering that types
could be shrunk more drastically by using subclasses for the different
codes.
This is v2 of this patch, which has these changes:
* I changed nfields to 'unsigned', per Simon's request. I looked at
changing all the uses, but this quickly fans out into a very large
patch. (One additional tweak was needed, though.)
* I wrote a test case. I discovered that GCC cannot compile a large
enough C test case, so I resorted to using the DWARF assembler.
This test doesn't reproduce the crash, but it does fail without the
patch.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29985
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I noticed a leftover mention of cooked_index_vector. This updates the
text.
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In PR gdb/29854, Simon pointed out that it would be good to be able to
use C-c when the DWARF cooked index is waiting for finalization. The
idea here is to be able to interrupt a command like "break" -- not to
stop the finalization process itself, which runs in a worker thread.
This patch implements this idea, by changing the index wait functions
to, by default, allow a quit. Polling is done, because there doesn't
seem to be a better way to interrupt a wait on a std::future.
For v2, I realized that the thread compatibility code in thread-pool.h
also needed an update.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29854
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keep_relocs is set by pe_ILF_save_relocs but not used anywhere in the
coff/pe code. It is tested by the xcoff backend but not set.
keep_contents is only used by the xcoff backend when dealing with
the .loader section, and it's easy enough to dispense with it there.
keep_contents is set in various places but that's fairly useless when
the contents aren't freed anyway until later linker support functions,
add_dynamic_symbols and check_dynamic_ar_symbols. There the contents
were freed if keep_contents wasn't set. I reckon we can free them
unconditionally.
* coff-bfd.h (struct coff_section_tdata): Delete keep_relocs
and keep_contents.
* peicode.h (pe_ILF_save_relocs): Don't set keep_relocs.
* xcofflink.c (xcoff_get_section_contents): Cache contents.
Return the contents. Update callers.
(_bfd_xcoff_canonicalize_dynamic_symtab): Don't set
keep_contents for .loader.
(xcoff_link_add_dynamic_symbols): Free .loader contents
unconditionally.
(xcoff_link_check_dynamic_ar_symbols): Likewise.
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keep_relocs and keep_contents are unused nowadays except by
xcofflink.c, and I can't see a reason why keep_syms needs to be set.
The external syms are read and used by sh_relax_section and used by
sh_relax_delete_bytes. There doesn't appear to be any way that
freeing them will cause trouble.
* coff-sh.c (sh_relax_section): Don't set keep_relocs,
keep_contents or keep_syms.
(sh_relax_delete_bytes): Don't set keep_contents.
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* compress.c (bfd_init_section_compress_status): Free
uncompressed_buffer on error return.
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If file size is calculated by bfd_get_file_size, as it is by
_bfd_alloc_and_read calls in coff_object_p, then it is cached and when
pe_ILF_build_a_bfd converts an archive entry over to BFD_IN_MEMORY,
the file size is no longer valid. Found when attempting objdump -t on
a very small (27 bytes) ILF file and hitting the pr24707 fix (commit
781152ec18f5). So, clear file size when setting BFD_IN_MEMORY on bfds
that may have been read. (It's not necessary in writable bfds,
because caching is ignored by bfd_get_size when bfd_write_p.)
I also think the PR 24707 fix is no longer neeeded. All of the
testcases in that PR and in PR24712 are caught earlier by file size
checks when reading the symbols from file. So I'm reverting that fix,
which just compared the size of an array of symbol pointers against
file size. That's only valid if on-disk symbols are larger than a
host pointer, so the test is better done in format-specific code.
bfd/
* coff-alpha.c (alpha_ecoff_get_elt_at_filepos): Clear cached
file size when making a BFD_IN_MEMORY bfd.
* opncls.c (bfd_make_readable): Likewise.
* peicode.h (pe_ILF_build_a_bfd): Likewise.
binutils/
PR 24707
* objdump.c (slurp_symtab): Revert PR24707 fix. Tidy.
(slurp_dynamic_symtab): Tidy.
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This is the assertion
know (*input_line_pointer != ' ');
after calling operand.
The usual exit from operand calls SKIP_ALL_WHITESPACE.
* expr.c (operand): Call SKIP_ALL_WHITESPACE after call to expr.
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the frame cache
The test gdb.base/frame-view.exp fails like this on AArch64:
frame^M
#0 baz (z1=hahaha, /home/simark/src/binutils-gdb/gdb/value.c:4056: internal-error: value_fetch_lazy_register: Assertion `next_frame != NULL' failed.^M
A problem internal to GDB has been detected,^M
further debugging may prove unreliable.^M
FAIL: gdb.base/frame-view.exp: with_pretty_printer=true: frame (GDB internal error)
The sequence of events leading to this is the following:
- When we create the user frame (the "select-frame view" command), we
create a sentinel frame just for our user-created frame, in
create_new_frame. This sentinel frame has the same id as the regular
sentinel frame.
- When printing the frame, after doing the "select-frame view" command,
the argument's pretty printer is invoked, which does an inferior
function call (this is the point of the test). This clears the frame
cache, including the "real" sentinel frame, which sets the
sentinel_frame global to nullptr.
- Later in the frame-printing process (when printing the second
argument), the auto-reinflation mechanism re-creates the user frame
by calling create_new_frame again, creating its own special sentinel
frame again. However, note that the "real" sentinel frame, the
sentinel_frame global, is still nullptr. If the selected frame had
been a regular frame, we would have called get_current_frame at some
point during the reinflation, which would have re-created the "real"
sentinel frame. But it's not the case when reinflating a user frame.
- Deep down the stack, something wants to fill in the unwind stop
reason for frame 0, which requires trying to unwind frame 1. This
leads us to trying to unwind the PC of frame 1:
#0 gdbarch_unwind_pc (gdbarch=0xffff8d010080, next_frame=...) at /home/simark/src/binutils-gdb/gdb/gdbarch.c:2955
#1 0x000000000134569c in dwarf2_tailcall_sniffer_first (this_frame=..., tailcall_cachep=0xffff773fcae0, entry_cfa_sp_offsetp=0xfffff7f7d450)
at /home/simark/src/binutils-gdb/gdb/dwarf2/frame-tailcall.c:390
#2 0x0000000001355d84 in dwarf2_frame_cache (this_frame=..., this_cache=0xffff773fc928) at /home/simark/src/binutils-gdb/gdb/dwarf2/frame.c:1089
#3 0x00000000013562b0 in dwarf2_frame_unwind_stop_reason (this_frame=..., this_cache=0xffff773fc928) at /home/simark/src/binutils-gdb/gdb/dwarf2/frame.c:1101
#4 0x0000000001990f64 in get_prev_frame_always_1 (this_frame=...) at /home/simark/src/binutils-gdb/gdb/frame.c:2281
#5 0x0000000001993034 in get_prev_frame_always (this_frame=...) at /home/simark/src/binutils-gdb/gdb/frame.c:2376
#6 0x000000000199b814 in get_frame_unwind_stop_reason (frame=...) at /home/simark/src/binutils-gdb/gdb/frame.c:3051
#7 0x0000000001359cd8 in dwarf2_frame_cfa (this_frame=...) at /home/simark/src/binutils-gdb/gdb/dwarf2/frame.c:1356
#8 0x000000000132122c in dwarf_expr_context::execute_stack_op (this=0xfffff7f80170, op_ptr=0xffff8d8883ee "\217\002", op_end=0xffff8d8883ee "\217\002")
at /home/simark/src/binutils-gdb/gdb/dwarf2/expr.c:2110
#9 0x0000000001317b30 in dwarf_expr_context::eval (this=0xfffff7f80170, addr=0xffff8d8883ed "\234\217\002", len=1) at /home/simark/src/binutils-gdb/gdb/dwarf2/expr.c:1239
#10 0x000000000131d68c in dwarf_expr_context::execute_stack_op (this=0xfffff7f80170, op_ptr=0xffff8d88840e "", op_end=0xffff8d88840e "") at /home/simark/src/binutils-gdb/gdb/dwarf2/expr.c:1811
#11 0x0000000001317b30 in dwarf_expr_context::eval (this=0xfffff7f80170, addr=0xffff8d88840c "\221p", len=2) at /home/simark/src/binutils-gdb/gdb/dwarf2/expr.c:1239
#12 0x0000000001314c3c in dwarf_expr_context::evaluate (this=0xfffff7f80170, addr=0xffff8d88840c "\221p", len=2, as_lval=true, per_cu=0xffff90b03700, frame=..., addr_info=0x0,
type=0xffff8f6c8400, subobj_type=0xffff8f6c8400, subobj_offset=0) at /home/simark/src/binutils-gdb/gdb/dwarf2/expr.c:1078
#13 0x000000000149f9e0 in dwarf2_evaluate_loc_desc_full (type=0xffff8f6c8400, frame=..., data=0xffff8d88840c "\221p", size=2, per_cu=0xffff90b03700, per_objfile=0xffff9070b980,
subobj_type=0xffff8f6c8400, subobj_byte_offset=0, as_lval=true) at /home/simark/src/binutils-gdb/gdb/dwarf2/loc.c:1513
#14 0x00000000014a0100 in dwarf2_evaluate_loc_desc (type=0xffff8f6c8400, frame=..., data=0xffff8d88840c "\221p", size=2, per_cu=0xffff90b03700, per_objfile=0xffff9070b980, as_lval=true)
at /home/simark/src/binutils-gdb/gdb/dwarf2/loc.c:1557
#15 0x00000000014aa584 in locexpr_read_variable (symbol=0xffff8f6cd770, frame=...) at /home/simark/src/binutils-gdb/gdb/dwarf2/loc.c:3052
- AArch64 defines a special "prev register" function,
aarch64_dwarf2_prev_register, to handle unwinding the PC. This
function does
frame_unwind_register_unsigned (this_frame, AARCH64_LR_REGNUM);
- frame_unwind_register_unsigned ultimately creates a lazy register
value, saving the frame id of this_frame->next. this_frame is the
user-created frame, to this_frame->next is the special sentinel frame
we created for it. So the saved ID is the sentinel frame ID.
- When time comes to un-lazify the value, value_fetch_lazy_register
calls frame_find_by_id, to find the frame with the ID we saved.
- frame_find_by_id sees it's the sentinel frame ID, so returns the
sentinel_frame global, which is, if you remember, nullptr.
- We hit the `gdb_assert (next_frame != NULL)` assertion in
value_fetch_lazy_register.
The issues I see here are:
- The ID of the sentinel frame created for the user-created frame is
not distinguishable from the ID of the regular sentinel frame. So
there's no way frame_find_by_id could find the right frame, in
value_fetch_lazy_register.
- Even if they had distinguishable IDs, sentinel frames created for
user frames are not registered anywhere, so there's no easy way
frame_find_by_id could find it.
This patch addresses these two issues:
- Give sentinel frames created for user frames their own distinct IDs
- Register sentinel frames in the frame cache, so they can be found
with frame_find_by_id.
I initially had this split in two patches, but I then found that it was
easier to explain as a single patch.
Rergarding the first part of the change: with this patch, the sentinel
frames created for user frames (in create_new_frame) still have
stack_status == FID_STACK_SENTINEL, but their code_addr and stack_addr
fields are now filled with the addresses used to create the user frame.
This ensures this sentinel frame ID is different from the "target"
sentinel frame ID, as well as any other "user" sentinel frame ID. If
the user tries to create the same frame, with the same addresses,
multiple times, create_sentinel_frame just reuses the existing frame.
So we won't end up with multiple user sentinels with the same ID.
Regular "target" sentinel frames remain with code_addr and stack_addr
unset.
The concrete changes for that part are:
- Remove the sentinel_frame_id constant, since there isn't one
"sentinel frame ID" now. Add the frame_id_build_sentinel function
for building sentinel frame IDs and a is_sentinel_frame_id function
to check if a frame id represents a sentinel frame.
- Replace the sentinel_frame_id check in frame_find_by_id with a
comparison to `frame_id_build_sentinel (0, 0)`. The sentinel_frame
global is meant to contain a reference to the "target" sentinel, so
the one with addresses (0, 0).
- Add stack and code address parameters to create_sentinel_frame, to be
able to create the various types of sentinel frames.
- Adjust get_current_frame to create the regular "target" sentinel.
- Adjust create_new_frame to create a sentinel with the ID specific to
the created user frame.
- Adjust sentinel_frame_prev_register to get the sentinel frame ID from
the frame_info object, since there isn't a single "sentinel frame ID"
now.
- Change get_next_frame_sentinel_okay to check for a
sentinel-frame-id-like frame ID, rather than for sentinel_frame
specifically, since this function could be called with another
sentinel frame (and we would want the assert to catch it).
The rest of the change is about registering the sentinel frame in the
frame cache:
- Change frame_stash_add's assertion to allow sentinel frame levels
(-1).
- Make create_sentinel_frame add the frame to the frame cache.
- Change the "sentinel_frame != NULL" check in reinit_frame_cache for a
check that the frame stash is not empty. The idea is that if we only
have some user-created frames in the cache when reinit_frame_cache is
called, we probably want to emit the frames invalid annotation. The
goal of that check is to avoid unnecessary repeated annotations, I
suppose, so the "frame cache not empty" check should achieve that.
After this change, I think we could theoritically get rid of the
sentienl_frame global. That sentinel frame could always be found by
looking up `frame_id_build_sentinel (0, 0)` in the frame cache.
However, I left the global there to avoid slowing the typical case down
for nothing. I however, noted in its comment that it is an
optimization.
With this fix applied, the gdb.base/frame-view.exp now passes for me on
AArch64. value_of_register_lazy now saves the special sentinel frame ID
in the value, and value_fetch_lazy_register is able to find that
sentinel frame after the frame cache reinit and after the user-created
frame was reinflated.
Tested-By: Alexandra Petlanova Hajkova <ahajkova@redhat.com>
Tested-By: Luis Machado <luis.machado@arm.com>
Change-Id: I8b77b3448822c8aab3e1c3dda76ec434eb62704f
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frame cache
Currently, some frame resources are deallocated by iterating on the
frame chain (starting from the sentinel), calling dealloc_cache. The
problem is that user-created frames are not part of that chain, so we
never call dealloc_cache for them.
I propose to make it so the dealloc_cache callbacks are called when the
frames are removed from the frame_stash hash table, by registering a
deletion function to the hash table. This happens when
frame_stash_invalidate is called by reinit_frame_cache. This way, all
frames registered in the cache will get their unwinder's dealloc_cache
callbacks called.
Note that at the moment, the sentinel frames are not registered in the
cache, so we won't call dealloc_cache for them. However, it's just a
theoritical problem, because the sentinel frame unwinder does not
provide this callback. Also, a subsequent patch will change things so
that sentinel frames are registered to the cache.
I moved the obstack_free / obstack_init pair below the
frame_stash_invalidate call in reinit_frame_cache, because I assumed
that some dealloc_cache would need to access some data on that obstack,
so it would be better to free it after clearing the hash table.
Change-Id: If4f9b38266b458c4e2f7eb43e933090177c22190
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A few tdep files include block.h but do not need to. This patch
removes the inclusions. I checked that this worked correctly by
examining the resulting .Po file to make sure that block.h was not
being included by some other route.
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expop.h needs block.h for a single inline function. However, I don't
think most of the check_objfile functions need to be defined in the
header (just the templates). This patch moves the one offending
function and removes the include.
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This patch implements a simplication that I suggested here:
https://sourceware.org/pipermail/gdb-patches/2022-March/186320.html
Currently, the interp::exec virtual method interface is such that
subclass implementations must catch exceptions and then return them
via normal function return.
However, higher up the in chain, for the CLI we get to
interpreter_exec_cmd, which does:
for (i = 1; i < nrules; i++)
{
struct gdb_exception e = interp_exec (interp_to_use, prules[i]);
if (e.reason < 0)
{
interp_set (old_interp, 0);
error (_("error in command: \"%s\"."), prules[i]);
}
}
and for MI we get to mi_cmd_interpreter_exec, which has:
void
mi_cmd_interpreter_exec (const char *command, char **argv, int argc)
{
...
for (i = 1; i < argc; i++)
{
struct gdb_exception e = interp_exec (interp_to_use, argv[i]);
if (e.reason < 0)
error ("%s", e.what ());
}
}
Note that if those errors are reached, we lose the original
exception's error code. I can't see why we'd want that.
And, I can't see why we need to have interp_exec catch the exception
and return it via the normal return path. That's normally needed when
we need to handle propagating exceptions across C code, like across
readline or ncurses, but that's not the case here.
It seems to me that we can simplify things by removing some
try/catch-ing and just letting exceptions propagate normally.
Note, the "error in command" error shown above, which only exists in
the CLI interpreter-exec command, is only ever printed AFAICS if you
run "interpreter-exec console" when the top level interpreter is
already the console/tui. Like:
(gdb) interpreter-exec console "foobar"
Undefined command: "foobar". Try "help".
error in command: "foobar".
You won't see it with MI's "-interpreter-exec console" from a top
level MI interpreter:
(gdb)
-interpreter-exec console "foobar"
&"Undefined command: \"foobar\". Try \"help\".\n"
^error,msg="Undefined command: \"foobar\". Try \"help\"."
(gdb)
nor with MI's "-interpreter-exec mi" from a top level MI interpreter:
(gdb)
-interpreter-exec mi "-foobar"
^error,msg="Undefined MI command: foobar",code="undefined-command"
^done
(gdb)
in both these cases because MI's -interpreter-exec just does:
error ("%s", e.what ());
You won't see it either when running an MI command with the CLI's
"interpreter-exec mi":
(gdb) interpreter-exec mi "-foobar"
^error,msg="Undefined MI command: foobar",code="undefined-command"
(gdb)
This last case is because MI's interp::exec implementation never
returns an error:
gdb_exception
mi_interp::exec (const char *command)
{
mi_execute_command_wrapper (command);
return gdb_exception ();
}
Thus I think that "error in command" error is pretty pointless, and
since it simplifies things to not have it, the patch just removes it.
The patch also ends up addressing an old FIXME.
Change-Id: I5a6432a80496934ac7127594c53bf5221622e393
Approved-By: Tom Tromey <tromey@adacore.com>
Approved-By: Kevin Buettner <kevinb@redhat.com>
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Many gdb.compile C++ tests fail for me on Fedora 36. I think these
are largely bugs in the plugin, though I didn't investigate too
deeply. Once one failure is seen, this often cascades and sometimes
there are many timeouts.
For example, this can happen:
(gdb) compile code var = a->get_var ()
warning: Could not find symbol "_ZZ9_gdb_exprP10__gdb_regsE1a" for compiled module "/tmp/gdbobj-0xdI6U/out2.o".
1 symbols were missing, cannot continue.
I think this is probably a plugin bug because, IIRC, in theory these
symbols should be exempt from a lookup via gdb.
This patch arranges to catch any catastrophic failure and then simply
exit the entire .exp file.
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I had a .gdb_history file in my testsuite directory in the build tree,
and this provoked a failure in gdbhistsize-history.exp. It seems
simple to prevent this file from causing a failure.
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fixup_symbol_section delegates all its work to fixup_section, so merge
the two.
Because there is only a single caller to fixup_symbol_section, we can
also remove some of the introductory logic. For example, this will
never be called with a NULL objfile any more.
The LOC_BLOCK case can be removed, because such symbols are handled by
the buildsym code now.
Finally, a symbol can only appear in a SEC_ALLOC section, so the loop
is modified to skip sections that do not have this flag set.
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Nearly every call to fixup_symbol_section in gdb is incorrect, and if
any such call has an effect, it's purely by happenstance.
fixup_section has a long comment explaining that the call should only
be made before runtime section offsets are applied. And, the loop in
this code (the fallback loop -- the minsym lookup code is "ok") is
careful to remove these offsets before comparing addresses.
However, aside from a single call in dwarf2/read.c, every call in gdb
is actually done after section offsets have been applied. So, these
calls are incorrect.
Now, these calls could be made when the symbol is created. I
considered this approach, but I reasoned that the code has been this
way for many years, seemingly without ill effect. So, instead I chose
to simply remove the offending calls.
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When a symbol's block is set, the block has the runtime section offset
applied. So, it seems to me that the symbol implicitly is in the same
section as the block. Therefore, this patch sets the symbol's section
index at this same spot.
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The previous patch hard-coded SECT_OFF_TEXT into the buildsym code.
After this, it's clear that there is only one caller of
compunit_symtab::set_block_line_section, and it always passes
SECT_OFF_TEXT. So, remove compunit_symtab::m_block_line_section and
use SECT_OFF_TEXT instead.
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Right now, the section index passed to end_compunit_symtab is always
SECT_OFF_TEXT. Remove this parameter and simply always use
SECT_OFF_TEXT.
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Most places in gdb that create a new symbol will apply a section
offset to the address. It seems to me that the choice of offset here
is also an implicit choice of the section. This is particularly true
if you examine fixup_section, which notes that it must be called
before such offsets are applied -- meaning that if any such call has
an effect, it's purely by accident.
This patch cleans up this area by tracking the section index and
applying it to a symbol when the address is set. This is done for
nearly every case -- the remaining cases will be handled in later
patches.
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If fixup_section does not find a matching section, it arbitrarily
chooses the first one. However, it seems better to make this default
depend on the type of the symbol -- i.e., default data symbols to
.data and text symbols to .text.
I've also made fixup_section static, as it only has one caller.
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This changes the cooked_index_functions to avoid an extra null check
now that checked_static_cast allows a null argument.
Approved-By: Simon Marchi <simon.marchi@efficios.com>
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Test-case gdb.base/longjmp.exp handles both the case that there is a libc
longjmp probe, and the case that there isn't.
However, it only tests one of the two cases.
Use maint ignore-probes to test both cases, if possible.
Tested on x86_64-linux.
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Test-case gdb.base/solib-corrupted.exp only works for a glibc without probes
interface, otherwise we run into:
...
XFAIL: gdb.base/solib-corrupted.exp: info probes
UNTESTED: gdb.base/solib-corrupted.exp: GDB is using probes
...
Fix this by using maint ignore-probes to simulate the absence of the relevant
probes.
Also, it requires glibc debuginfo, and if not present, it produces an XFAIL:
...
XFAIL: gdb.base/solib-corrupted.exp: make solibs looping
UNTESTED: gdb.base/solib-corrupted.exp: no _r_debug symbol has been found
...
This is incorrect, because an XFAIL indicates a known problem in the
environment. In this case, there is no problem: the environment is
functioning as expected when glibc debuginfo is not installed.
Fix this by using UNSUPPORTED instead, and make the message less cryptic:
...
UNSUPPORTED: gdb.base/solib-corrupted.exp: make solibs looping \
(glibc debuginfo required)
...
Finally, with glibc debuginfo present, we run into:
...
(gdb) PASS: gdb.base/solib-corrupted.exp: make solibs looping
info sharedlibrary^M
warning: Corrupted shared library list: 0x7ffff7ffe750 != 0x0^M
From To Syms Read Shared Object Library^M
0x00007ffff7dd4170 0x00007ffff7df4090 Yes /lib64/ld-linux-x86-64.so.2^M
(gdb) FAIL: gdb.base/solib-corrupted.exp: corrupted list \
(shared library list corrupted)
...
due to commit 44288716537 ("gdb, testsuite: extend gdb_test_multiple checks").
Fix this by rewriting into gdb_test_multiple and using -early.
Tested on x86_64-linux, with and without glibc debuginfo installed.
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gprofng/ChangeLog
2023-02-07 Vladimir Mezentsev <vladimir.mezentsev@oracle.com>
PR gprofng/30093
* src/Dwarf.cc: add nullptr check.
* src/DwarfLib.cc: Likewise.
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f.bfd_ptr is set too early to be a reliable indicator of good debug
info.
* dwarf2.c (_bfd_dwarf2_slurp_debug_info): Correct test for
debug info being previously found.
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This commit addresses the issue in PR gdb/30087.
If a breakpoint with multiple locations has a thread condition, then
the 'info breakpoints' output is a little messed up, here's an example
of the current output:
(gdb) break foo thread 1
Breakpoint 2 at 0x401114: foo. (3 locations)
(gdb) break bar thread 1
Breakpoint 3 at 0x40110a: file /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c, line 32.
(gdb) info breakpoints
Num Type Disp Enb Address What
2 breakpoint keep y <MULTIPLE> thread 1
stop only in thread 1
2.1 y 0x0000000000401114 in foo at /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c:25
2.2 y 0x0000000000401146 in foo at /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c:25
2.3 y 0x0000000000401168 in foo at /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c:25
3 breakpoint keep y 0x000000000040110a in bar at /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c:32 thread 1
stop only in thread 1
Notice that, at the end of the location for breakpoint 3, the 'thread
1' condition is printed, but this is then repeated on the next line
with 'stop only in thread 1'.
In contrast, for breakpoint 2, the 'thread 1' appears randomly, in the
"What" column, though slightly offset, non of the separate locations
have the 'thread 1' information. Additionally for breakpoint 2 we
also get a 'stop only in thread 1' line.
There's two things going on here. First the randomly placed 'thread
1' for breakpoint 2 is due to a bug in print_one_breakpoint_location,
where we check the variable part_of_multiple instead of
header_of_multiple.
If I fix this oversight, then the output is now:
(gdb) break foo thread 1
Breakpoint 2 at 0x401114: foo. (3 locations)
(gdb) break bar thread 1
Breakpoint 3 at 0x40110a: file /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c, line 32.
(gdb) info breakpoints
Num Type Disp Enb Address What
2 breakpoint keep y <MULTIPLE>
stop only in thread 1
2.1 y 0x0000000000401114 in foo at /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c:25 thread 1
2.2 y 0x0000000000401146 in foo at /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c:25 thread 1
2.3 y 0x0000000000401168 in foo at /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c:25 thread 1
3 breakpoint keep y 0x000000000040110a in bar at /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c:32 thread 1
stop only in thread 1
The 'thread 1' condition is now displayed at the end of each location,
which makes the output the same for single location breakpoints and
multi-location breakpoints.
However, there's still some duplication here. Both breakpoints 2 and
3 include a 'stop only in thread 1' line, and it feels like the
additional 'thread 1' is redundant. In fact, there's a comment to
this very effect in the code:
/* FIXME: This seems to be redundant and lost here; see the
"stop only in" line a little further down. */
So, lets fix this FIXME. The new plan is to remove all the trailing
'thread 1' markers from the CLI output, we now get this:
(gdb) break foo thread 1
Breakpoint 2 at 0x401114: foo. (3 locations)
(gdb) break bar thread 1
Breakpoint 3 at 0x40110a: file /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c, line 32.
(gdb) info breakpoints
Num Type Disp Enb Address What
2 breakpoint keep y <MULTIPLE>
stop only in thread 1
2.1 y 0x0000000000401114 in foo at /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c:25
2.2 y 0x0000000000401146 in foo at /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c:25
2.3 y 0x0000000000401168 in foo at /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c:25
3 breakpoint keep y 0x000000000040110a in bar at /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c:32
stop only in thread 1
All of the above points are also true for the Ada 'task' breakpoint
condition, and the changes I've made also update how the task
information is printed, though in the case of the Ada task there was
no 'stop only in task XXX' line printed, so I've added one of those.
Obviously it can't be quite that easy. For MI backwards compatibility
I've retained the existing code (but now only for MI like outputs),
which ensures we should generate backwards compatible output.
I've extended an Ada test to cover the new task related output, and
updated all the tests I could find that checked for the old output.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30087
Approved-By: Pedro Alves <pedro@palves.net>
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PR 30080 * doc/binutils.texi (nm): Update description of the 'n' symbol type.
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I came across:
...
UNTESTED: gdb.ada/finish-var-size.exp: GCC too told for this test
...
The message only tells us that the compiler version too old, not what compiler
version is required.
Fix this by rewriting using required:
...
UNSUPPORTED: gdb.ada/finish-var-size.exp: require failed: \
expr [gcc_major_version] >= 12
...
Tested on x86_64-linux.
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Remove the stale reference to INFO, which is now "this target
description info" now.
Change-Id: I35dbdb089048ed7cfffe730d3134ee391b176abf
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The documentation for the 'handle' command does not cover all of the
features of the command, and in one case, is just wrong.
The user can specify 'all' as signal name, the documentation implies
that this will change the behaviour of all signals, in reality, this
changes all signals except SIGINT and SIGTRAP (the signals used by
GDB). I've updated the docs to list this limitation.
The 'handle' command also allows the user to specify multiple signals
for a single command, e.g. 'handle SIGFPE SIGILL nostop pass print',
however the documentation doesn't describe this, so I've updated the
docs to describe this feature.
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When using a bss-plt we'll always trigger the RWX warning, which
disturbs gcc test results. On the other hand, there may be reason to
want the warning when gcc is configured with --enable-secureplt.
So turning off the warning entirely for powerpc might not be the best
solution. Instead, we'll turn off the warning whenever a bss-plt is
generated, unless the user explicitly asked for the warning.
bfd/
* elf32-ppc.c (ppc_elf_select_plt_layout): Set
no_warn_rwx_segments on generating a bss plt, unless explicity
enabled by the user. Also show the bss-plt warning when
--warn-rwx-segments is given without --bss-plt.
include/
* bfdlink.h (struct bfd_link_info): Add user_warn_rwx_segments.
ld/
* lexsup.c (parse_args): Set user_warn_rwx_segments.
* testsuite/ld-elf/elf.exp: Pass --secure-plt for powerpc to
the rwx tests.
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Occasionally, I run into:
...
(gdb) PASS: gdb.threads/schedlock.exp: schedlock=on: cmd=continue: \
set scheduler-locking on
continue^M
Continuing.^M
PASS: gdb.threads/schedlock.exp: schedlock=on: cmd=continue: \
continue (with lock)
[Thread 0x7ffff746e700 (LWP 1339) exited]^M
No unwaited-for children left.^M
(gdb) Quit^M
(gdb) FAIL: gdb.threads/schedlock.exp: schedlock=on: cmd=continue: \
stop all threads (with lock) (timeout)
...
What happens is that this loop which is supposed to run "just short of forever":
...
/* Don't run forever. Run just short of it :) */
while (*myp > 0)
{
/* schedlock.exp: main loop. */
MAYBE_CALL_SOME_FUNCTION(); (*myp) ++;
}
...
finishes after 0x7fffffff iterations (when a signed wrap occurs), which on my
system takes only about 1.5 seconds.
Fix this by:
- changing the pointed-at type of myp from signed to unsigned, which makes the
wrap defined behaviour (and which also make the loop run twice as long,
which is already enough to make it impossible for me to reproduce the FAIL.
But let's try to solve this more structurally).
- changing the pointed-at type of myp from int to long long, making the wrap
unlikely.
- making sure the loop runs forever, by setting the loop condition to 1.
- making sure the loop still contains different lines (as far as debug info is
concerned) by incrementing a volatile counter in the loop.
- making sure the program doesn't run forever in case of trouble, by adding an
"alarm (30)".
Tested on x86_64-linux.
PR testsuite/30074
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30074
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