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The problems can be illustrated, with any program, below:
(gdb) print main
$1 = {main} 0x0
The return type was incorrectly set in read_func_kind_type, with
the name of the function, which leads c_type_print_base_1 to print
it. In addition, the address of a new function needs to be set with
that info in its minimal symtab entry, when the new function is added.
After the fix:
(gdb) print main
$1 = {int ()} 0x4004b7 <main>
A new test, gdb.ctf/funcreturn.exp, is added to the testsuite.
gdb/ChangeLog:
* ctfread.c (new_symbol): Set function address.
(read_func_kind_type): Remove incorrect type name setting.
Don't copy name returned from ctf_type_ame_raw throughout file.
gdb/testsuite/ChangeLog:
* gdb.ctf/funcreturn.exp: New file.
* gdb.ctf/whatis.c: Copy from gdb.base.
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A random grab bag of minor fixes to enable -Werror for this port.
Cast address vars to long when the format was using %l.
Use %zu with sizeof operations.
Add const to a bunch of strings.
Trim unused variables.
Fix sizeof call to calculate target storage and not the pointer itself.
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Drop our compat code and assume environ exists to simplify.
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* dwarf.c (process_cu_tu_index): Avoid pointer UB. Use _mul_overflow.
Delete dead code.
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* dwarf.c (display_gdb_index): Avoid pointer UB and overflow in
length calculations.
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* dwarf.c (display_debug_names): Complain when header length is
too small. Avoid pointer UB. Sanity check augmentation string,
CU table, TU table and foreign TU table sizes.
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* dwarf.c (display_debug_frames): Delete initial_length_size.
Avoid pointer UB. Constrain data reads to length given in header.
Sanity check cie header length. Only skip up to next FDE on
finding augmentation data too long.
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* dwarf.c (read_cie): Add more sanity checks to ensure data
pointer is not bumped past end.
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* dwarf.c (display_debug_ranges): Delete initial_length_size.
Correct fallback size calculated on finding a reloc. Constrain
data reads to length given in header. Avoid pointer UB.
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* dwarf.c (display_debug_rnglists_list): Avoid pointer UB.
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* dwarf.c (display_debug_str_offsets): Constrain reads to length
given in header.
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* dwarf.c (display_debug_aranges): Delete initial_length_size.
Use end_ranges to constrain data reads to header length. Avoid
pointer UB.
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* dwarf.c (display_loc_list): Avoid pointer UB. Correct check
before reading uleb length. Warn on excess length.
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* dwarf.c (display_debug_macro): Print strings that might not
be zero terminated with %*s. Don't bump curr if unterminated.
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* dwarf.c (get_line_filename_and_dirname): Delete initial_length_size.
Simplify length sanity check, and check for too small lengths.
Constrain data reads to header length. Avoid pointer UB.
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The existing code went to the bother of using strnlen for scanning but
went wild when printing, and possibly incremented curr past end.
* dwarf.c (display_debug_macinfo): Print strings that might not
be zero terminated with %*s. Don't bump curr if unterminated.
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* dwarf.c (display_debug_pubnames_worker): Delete initial_length_size.
Simplify length check. Constrain reads to length given by header.
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The directory_table strnlen used the negative of the proper size. After
fixing that I realised we don't need strnlen here.
* dwarf.c (display_debug_lines_decoded): Don't use strnlen when
we have already checked for NUL termination.
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This patch also better constrains the data read, and removes pointer UB.
* dwarf.c (read_debug_line_header): Delete initial_length_size.
Avoid pointer UB. Keep within length specified by header.
Delete dead code.
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This patch constrains process_debug_info to stay within the data
specified by the CU length rather than allowing access up to the end
of the section.
* dwarf.c (process_debug_info): Always do the first CU length
scan for sanity checks. Remove initial_length_size var and
instead calculate end_cu. Use end_cu to limit data reads.
Delete now dead code checking length.
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We won't want this assert triggering in the next release.
* dwarf.c (SAFE_BYTE_GET_INTERNAL): Assert only when ENABLE_CHECKING.
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A sufficiently mad compiler optimiser can take undefined behaviour
according to the C standard as an opportunity to remove code. Since
"data + size" might be seen to be past the end of an array,
calculating such an expression is UB.
_mul_overflow is infrastructure for later patches.
* bucomm.h (_mul_overflow): Define.
* dwarf.c (get_encoded_value): Avoid pointer UB.
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PR 27834
* options.cc (General_options::General_options): Init bsymbolic_.
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An upstream Rust bug notes notes that the Python pretty-printing
feature is broken for values that appear as members of certain types
in Rust.
The bug here is that some of the Rust value-printing code calls
value_print_inner, a method on rust_language. This bypasses the
common code that calls into Python.
I'm checking this in.
gdb/ChangeLog
2021-05-14 Tom Tromey <tom@tromey.com>
* rust-lang.c (rust_language::val_print_struct)
(rust_language::print_enum): Use common_val_print, not
value_print_inner.
gdb/testsuite/ChangeLog
2021-05-14 Tom Tromey <tom@tromey.com>
* gdb.rust/pp.exp: New file.
* gdb.rust/pp.py: New file.
* gdb.rust/pp.rs: New file.
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Rather than rely on off_t being the right size between the host &
target, have the interface always be 64-bit. We can figure out if
we need to truncate when actually outputting it to the right target.
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PR sim/27705
Rather than rely on time_t being the right size between the host &
target, have the interface always be 64-bit. We can figure out if
we need to truncate when actually outputting it to the right target.
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gold/
PR 27834
* options.h (General_options): Make -Bsymbolic and
-Bsymbolic-functions special and adjust the help messages. Add
enum Bsymbolic_kind and -Bno-symbolic.
* options.cc (General_options): Define parse_Bno_symbolic,
parse_Bsymbolic_functions, and parse_Bsymbolic.
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After the gdb test-suite runs there are some files
left in /tmp/tmp*/*.gdb-index, remove those files
and the directory at the end of the test case.
gdb/testsuite:
2021-05-14 Bernd Edlinger <bernd.edlinger@hotmail.de>
* gdb.base/index-cache.exp: Cleanup $cache_dir/*.gdb-index and
remove the directory.
* gdb.dwarf2/per-bfd-sharing.exp: Likewise.
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Define a 'connection_num' attribute for Inferior objects. The
read-only attribute is the ID of the connection of an inferior, as
printed by "info inferiors". In GDB's internal terminology, that's
the process stratum target of the inferior. If the inferior has no
target connection, the attribute is None.
gdb/ChangeLog:
2021-05-14 Tankut Baris Aktemur <tankut.baris.aktemur@intel.com>
* python/py-inferior.c (infpy_get_connection_num): New function.
(inferior_object_getset): Add a new element for 'connection_num'.
* NEWS: Mention the 'connection_num' attribute of Inferior objects.
gdb/doc/ChangeLog:
2021-05-14 Tankut Baris Aktemur <tankut.baris.aktemur@intel.com>
* python.texi (Inferiors In Python): Mention the 'connection_num'
attribute.
gdb/testsuite/ChangeLog:
2021-05-14 Tankut Baris Aktemur <tankut.baris.aktemur@intel.com>
* gdb.python/py-inferior.exp: Add test cases for 'connection_num'.
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Convert a couple of local variables from int to bool. There should be
no user visible changes after this commit.
gdb/ChangeLog:
* remote.c (check_pending_events_prevent_wildcard_vcont): Change
argument type, update and re-wrap, header comment.
(remote_target::commit_resumed): Convert any_process_wildcard and
may_global_wildcard_vcont from int to bool.
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The %pcrel_lo addend may causes the overflow, and need more than one
%pcrel_hi values. But there may be only one auipc, shared by those
%pcrel_lo with addends. However, the existing check method in the
riscv_resolve_pcrel_lo_relocs, may not be able to work for some
special/corner cases.
Consider the testcases pcrel-lo-addend-2b. Before applying this patch,
I can compile it successfully. But in fact the addend cause the value
of %pcrel_hi to be different. This patch try to check the value of
%pcrel_hi directly, to make sure it won't be changed. Otherwise, linker
will report the following errors,
(.text+0xa): dangerous relocation: %pcrel_lo overflow with an addend,
the value of %pcrel_hi is 0x1000 without any addend, but may be 0x2000
after adding the %pcrel_lo addend
The toolchain regressions, rv64gc-linux/rv64gc-elf/rv32gc-linux/rv32i-elf,
pass expectedly and looks fine.
bfd/
* elfnn-riscv.c (riscv_resolve_pcrel_lo_relocs): Check the values
of %pcrel_hi, before and after adding the addend. Make sure the
value won't be changed, otherwise, report dangerous error.
ld/
* testsuite/ld-riscv-elf/ld-riscv-elf.exp: Updated.
* testsuite/ld-riscv-elf/pcrel-lo-addend-2a.d: Renamed from
pcrel-lo-addend-2.
* testsuite/ld-riscv-elf/pcrel-lo-addend-2a.s: Likewise.
* testsuite/ld-riscv-elf/pcrel-lo-addend-2b.d: New testcase.
* testsuite/ld-riscv-elf/pcrel-lo-addend-2b.s: Likewise.
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The 'print max-depth' feature incorrectly causes GDB to skip printing
the string representation of pretty printed variables if the variable
is stored at a nested depth corresponding to the set max-depth value.
This change ensures that it is always printed before checking whether
the maximum print depth has been reached.
Regression tested with GCC 7.3.0 on x86_64, ppc64le, aarch64.
gdb/ChangeLog:
* cp-valprint.c (cp_print_value): Replaced duplicate code.
* guile/scm-pretty-print.c (ppscm_print_children): Check max_depth
just before printing child values.
(gdbscm_apply_val_pretty_printer): Don't check max_depth before
printing string representation.
* python/py-prettyprint.c (print_children): Check max_depth just
before printing child values.
(gdbpy_apply_val_pretty_printer): Don't check max_depth before
printing string representation.
gdb/testsuite/ChangeLog:
* gdb.python/py-format-string.c: Added a variable to test.
* gdb.python/py-format-string.exp: Check string representation is
printed at appropriate max_depth settings.
* gdb.python/py-nested-maps.exp: Likewise.
* gdb.guile/scm-pretty-print.exp: Add additional tests.
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We require C11 now, so no need for these pre-ANSI C hacks.
PTR is simply void*, so use that directly.
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This define is handled by ansidecl.h, so no need to duplicate effort.
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We use types from these headers, so always include them.
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The gdb/callback.h & gdb/remote-sim.h headers have nothing to do with
gdb and are really definitions for the libsim API under the sim/ tree.
While gdb uses those headers as a client, it's not specific to it. So
create a new sim/ namespace and move the headers there.
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Looks like these were copied & pasted as nothing from them are used.
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I realized that with "follow-exec-mode == new", the process target
stayed pushed in the original inferior. This can cause a small
incoherence:
$ ./gdb -q -nx --data-directory=data-directory -ex "set follow-exec-mode new" --args execer args-for-execer
Reading symbols from execer...
(gdb) r
Starting program: /home/smarchi/build/binutils-gdb/gdb/execer args-for-execer
I am execer and my argv[1] is: args-for-execer
process 3562426 is executing new program: /home/smarchi/build/binutils-gdb/gdb/execee
[New inferior 2]
[New process 3562426]
I am execee and my argv[1] is: arg-for-execee
[Inferior 2 (process 3562426) exited normally]
(gdb) info inferiors
Num Description Connection Executable
1 <null> 1 (native) /home/smarchi/build/binutils-gdb/gdb/execer
* 2 <null> /home/smarchi/build/binutils-gdb/gdb/execee
(gdb) maintenance print target-stack
The current target stack is:
- exec (Local exec file)
- None (None)
(gdb) inferior 1
[Switching to inferior 1 [<null>] (/home/smarchi/build/binutils-gdb/gdb/execer)]
(gdb) maintenance print target-stack
The current target stack is:
- native (Native process)
- exec (Local exec file)
- None (None)
On exec, when execution continues into inferior 2, the native target
isn't unpushed from inferior 1. When inferior 2's execution finishes
normally, inf_child_target::mourn_inferior unpushes the native target,
because the native target has been implicitly opened.
I think that if the native target was implicitly opened, it should be
unpushed from inferior 1, just like it is unpushed from an inferior
whose execution terminate. This patch implements that.
gdb/ChangeLog:
* inf-child.h (inf_child_target) <follow_exec>: New.
* inf-child.c (inf_child_target::follow_exec): New.
Change-Id: I782cc08d73d93a990f4e53611107f68b2cb58af1
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target_ops::follow_exec
On "exec", some targets need to unpush themselves from the inferior,
and do some bookkeeping, like forgetting the data associated to the
exec'ing inferior.
One such example is the thread-db target. It does so in
a special case in thread_db_target::wait, just before returning the
TARGET_WAITKIND_EXECD event to its caller.
We have another such case in the context of rocm-gdb [1], where the
"rocm" target is pushed on top of the linux-nat target. When an exec
happens, we want to unpush the rocm target from the exec'ing inferior to
close some file descriptors that refer to the pre-exec address space and
forget about that inferior. We then want to push the target on the
inferior in which execution continues, to open the file descriptors for
the post-exec address space.
I think that a good way to address this cleanly is to do all this in the
target_ops::follow_exec implementations. Make the
process_stratum_target::follow_exec implementation have the default
behavior of pushing itself to the new inferior's target stack (if
execution continues in a new inferior) and add the initial thread.
remote_target::follow_exec is an example of process target that wants to
do a bit more than the default behavior. So it calls
process_stratum_target::follow_exec first and does the extra work
second.
linux-thread-db (a non-process target) implements follow_exec to do some
bookeeping (forget about that process' data), before handing down the
event down to the process target (which hits
process_stratum_target::follow_exec).
gdb/ChangeLog:
* target.h (struct target_ops) <follow_exec>: Add ptid_t
parameter.
(target_follow_exec): Likewise.
* target.c (target_follow_exec): Add ptid_t parameter.
* infrun.c (follow_exec): Adjust call to target_follow_exec,
don't push target nor create thread.
* linux-thread-db.c (class thread_db_target) <follow_exec>: New.
(thread_db_target::wait): Just return on TARGET_WAITKIND_EXECD.
(thread_db_target::follow_exec): New.
* remote.c (class remote_target) <follow_exec>: Add ptid_t parameter.
(remote_target::follow_exec): Call
process_stratum_target::follow_exec.
* target-delegates.c: Re-generate.
Change-Id: I3f96d0ba3ea0dde6540b7e1b4d5cdb01635088c8
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target_follow_exec is currently only called in the "follow-exec-mode ==
new" branch of follow_exec, not the "follow-exec-mode == same" branch.
I think it would make sense to call it regardless of the mode to let
targets do some necessary handling.
This is needed in the context of rocm-gdb [1], where a target is pushed
on top of the linux-nat target. On exec, it needs to do some
bookkeeping, close some file descriptors / handles that were related to
the process pre-exec and open some new ones for the process post-exec.
However, by looking at the only in-tree implementation of
target_ops::follow_exec, remote_target::follow_exec, I found that it
would be useful for the extended-remote target too, to align its
behavior with native debugging (although I think that behavior is not
very user-friendly, see PR 27745 [2]).
Using two programs, one (let's call it "execer") that execs the other
(let's call it "execee"), with native:
$ ./gdb -q -nx --data-directory=data-directory ./execer
Reading symbols from ./execer...
(gdb) r
Starting program: /home/simark/build/binutils-gdb/gdb/execer
I am execer
process 1495622 is executing new program: /home/simark/build/binutils-gdb/gdb/execee
I am execee
[Inferior 1 (process 1495622) exited normally]
(gdb) r
Starting program: /home/simark/build/binutils-gdb/gdb/execee
I am execee
[Inferior 1 (process 1495626) exited normally]
And now with gdbserver (some irrelevant output lines removed for brevity):
$ ./gdbserver --once --multi :1234
...
$ ./gdb -q -nx --data-directory=data-directory ./execer -ex "set remote exec-file /home/simark/build/binutils-gdb/gdb/execer" -ex "tar ext :1234"
Reading symbols from ./execer...
Remote debugging using :1234
(gdb) r
Starting program: /home/simark/build/binutils-gdb/gdb/execer
process 1495724 is executing new program: /home/simark/build/binutils-gdb/gdb/execee
[Inferior 1 (process 1495724) exited normally]
(gdb) r
`target:/home/simark/build/binutils-gdb/gdb/execee' has disappeared; keeping its symbols.
Starting program: target:/home/simark/build/binutils-gdb/gdb/execee
warning: Build ID mismatch between current exec-file target:/home/simark/build/binutils-gdb/gdb/execee
and automatically determined exec-file target:/home/simark/build/binutils-gdb/gdb/execer
exec-file-mismatch handling is currently "ask"
Reading /home/simark/build/binutils-gdb/gdb/execer from remote target...
Load new symbol table from "target:/home/simark/build/binutils-gdb/gdb/execer"? (y or n)
When handling the exec, GDB updates the exec-file of the inferior to be
the execee. This means that a subsequent "run" will run the execee, not
the original executable (execer).
remote_target::follow_exec is meant to update the "remote exec-file",
which is the file on the remote system that will be executed if you
"run" the inferior, to the execee as well. However, this is not called
when follow-exec-mode is same, because target_follow_exec is not called
in this branch. As a result, GDB thinks the inferior is executing
execee but the remote side is really executing execer, hence the
mismatch message.
By calling target_follow_exec in the "same" branch of the follow_exec
function, we ensure that everybody agrees, and we get the same behavior
with the extended-remote target as we get with the native target, the
execee is executed on the second run:
$ ./gdbserver --once --multi :1234
...
$ ./gdb -q -nx --data-directory=data-directory ./execer -ex "set remote exec-file /home/simark/build/binutils-gdb/gdb/execer" -ex "tar ext :1234"
Reading symbols from ./execer...
Remote debugging using :1234
(gdb) r
Starting program: /home/simark/build/binutils-gdb/gdb/execer
process 1501445 is executing new program: /home/simark/build/binutils-gdb/gdb/execee
[Inferior 1 (process 1501445) exited normally]
(gdb) r
`target:/home/simark/build/binutils-gdb/gdb/execee' has disappeared; keeping its symbols.
Starting program: target:/home/simark/build/binutils-gdb/gdb/execee
[Inferior 1 (process 1501447) exited normally]
(gdb)
This scenario is tested in gdb.base/foll-exec-mode.exp, and in fact this
patch fixes the test for me when using
--target_board=native-extended-gdbserver.
gdb/ChangeLog:
* infrun.c (follow_exec): Call target_follow_fork when
follow-exec-mode is same.
* target.h (target_follow_fork): Improve doc.
[1] https://github.com/ROCm-Developer-Tools/ROCgdb
[2] https://sourceware.org/bugzilla/show_bug.cgi?id=27745
Change-Id: I4ee84a875e39bf3f8eaf3e6789a4bfe23a2a430e
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Incorrect dates in last 3 ChangeLog entries for gdb/testsuite/ChangeLog.
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The remaining duplicates are resolved by adding a with_test_prefix and
reindenting a proc. I also added a couple of additional test names to
some of the tests.
gdb/testsuite/ChangeLog:
* gdb.guile/scm-pretty-print.exp (run_lang_tests): Give some tests
unique names, also wrap proc body in with_test_prefix.
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This commit resolves almost all of the remaining duplicate test names
in gdb.guile/*.exp. This is done by either:
- Making use of with_test_prefix,
- Giving tests a unique name,
- Extending the existing name to make it unique,
- Not printing PASS lines for simple setup commands (e.g. loading
support modules, or adjusting GDB internal settings not relating to
guile).
gdb/testsuite/ChangeLog:
* gdb.guile/scm-frame-args.exp: Add with_test_prefix to resolve
duplicate test names.
* gdb.guile/scm-parameter.exp: Provide test names to avoid
duplicate names based on the command being run.
* gdb.guile/scm-symbol.exp: Extend test name to make it unique.
* gdb.guile/scm-type.exp (restart_gdb): Don't print PASS line when
loading a support module.
(test_equality): Update test name to match the actual test, making
the name unique in the process.
* gdb.guile/scm-value.exp (test_value_in_inferior): Add test names
to resolve duplicate tests.
(test_inferior_function_call): Likewise.
(test_subscript_regression): Likewise.
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The guile support library has some "tests" that are actually being
used to setup GDB ready for the real guile tests, e.g. we load some
support modules, and define some helper functions.
As this setup is done every time we call gdb_guile_runto_main, which
could be called multiple times in a single test script, this can lead
to duplicate PASS lines.
As this setup is all pretty basic, and isn't the actual focus of the
real tests, then in this commit I pass an empty test name through to
the gdb_test_no_output calls, the result of this is that the PASS
lines are no longer printed. This removes some duplicate tests from
the gdb.guile/*.exp set of tests.
gdb/testsuite/ChangeLog:
* lib/guile.exp (gdb_scm_load_file): Use empty test name to
silence PASS lines.
(gdb_install_guile_module): Likewise.
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This is unused, remove it.
gdb/ChangeLog:
* cli/cli-decode.h (struct cmd_list_element) <pre_show_hook>:
Remove.
* cli/cli-setshow.c (do_show_command): Adjust.
Change-Id: Ib9cd79d842550392b062309e1e5c079ad5d7571a
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