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GDB holds the inferior arguments as a single string. Currently when
GDB needs to pass the inferior arguments to a remote target as part of
a vRun packet, this is done by splitting the single argument string
into its component arguments by calling gdb::remote_args::split, which
uses the gdb_argv class to split the arguments for us.
The same gdb_argv class is used when the user has asked GDB/gdbserver
to start the inferior without first invoking a shell; the gdb_argv
class is used to split the argument string into it component
arguments, and each is passed as a separate argument to the execve
call which spawns the inferior.
There is however, a problem with using gdb_argv to split the arguments
before passing them to a remote target. To understand this problem we
must first understand how gdb_argv is used when invoking an inferior
without a shell.
And to understand how gdb_argv is used to start an inferior without a
shell, I feel we need to first look at an example of starting an
inferior with a shell.
Consider these two cases:
(a) (gdb) set args \$VAR
(b) (gdb) set args $VAR
When starting with a shell, in case (a) the user expects the inferior
to receive a literal '$VAR' string as an argument, while in case (b)
the user expects to see the shell expanded value of the variable $VAR.
If the user does 'set startup-with-shell off', then in (a) GDB will
strip the '\' while splitting the arguments, and the inferior will be
passed a literal '$VAR'. In (b) there is no '\' to strip, so also in
this case the inferior will receive a literal '$VAR', remember
startup-with-shell is off, so there is no shell that can ever expand
$VAR.
Notice, that when startup-with-shell is off, we end up with a many to
one mapping, both (a) and (b) result in the literal string $VAR being
passed to the inferior. I think this is the correct behaviour in this
case.
However, as we use gdb_argv to split the remote arguments we have the
same many to one mapping within the vRun packet. But the vRun packet
will be used when startup-with-shell is both on and off. What this
means is that when gdbserver receives a vRun packet containing '$VAR'
it doesn't know if GDB actually had '$VAR', or if GDB had '\$VAR'.
And this is a huge problem.
We can address this by making the argument splitting for remote
targets smarter, and I do have patches that try to do this in this
series:
https://inbox.sourceware.org/gdb-patches/cover.1730731085.git.aburgess@redhat.com
That series was pretty long, and wasn't getting reviewed, so I'm
pulling the individual patches out and posting them separately.
This patch doesn't try to improve remote argument splitting. I think
that splitting and then joining the arguments is a mistake which can
only introduce problems. The patch in the above series which tries to
make the splitting and joining "smarter" handles unquoted, single
quoted, and double quoted strings. But that doesn't really address
parameter substitution, command substitution, or arithmetic expansion.
And even if we did try to address these cases, what rules exactly
would we implement? Probably POSIX shell rules, but what if the
remote target doesn't have a POSIX shell? The only reason we're
talking about which shell rules to follow is because the splitting and
joining logic needs to mirror those rules. If we stop splitting and
joining then we no longer need to care about the target's shell.
Clearly, for backward compatibility we need to maintain some degree of
argument splitting and joining as we currently have; and that's why I
have a later patch (see the series above) that tries to improve that
splitting and joining a little. But I think, what we should really
do, is add a new feature flag (as used by the qSupported packet) and,
if GDB and the remote target agree, we should pass the inferior
arguments as a single string.
This solves all our problems. In the startup with shell case, we no
longer need to worry about splitting at all. The arguments are passed
unmodified to the remote target, that can then pass the arguments to
the shell directly.
In the 'startup-with-shell off' case it is now up to the remote target
to split the arguments, though in gdbserver we already did this, so
nothing really changes in this case. And if the remote target doesn't
have a POSIX shell, well GDB just doesn't need to worry about it!
Something similar to this was originally suggested in this series:
https://inbox.sourceware.org/gdb-patches/20211022071933.3478427-1-m.weghorn@posteo.de/
though this series didn't try to maintain backward compatibility,
which I think is an issue that my patch solves. Additionally, this
series only passed the arguments as a single string in some cases,
I've simplified this so that, when GDB and the remote agree, the
arguments are always passed as a single string. I think this is a
little cleaner.
I've also added documentation and some tests with this commit,
including ensuring that we test both the new single string approach,
and the fallback split/join approach.
I've credited the author of the referenced series as co-author as they
did come to a similar conclusion, though I think my implementation is
different enough that I'm happy to list myself as primary author.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=28392
Co-Authored-By: Michael Weghorn <m.weghorn@posteo.de>
Reviewed-By: Eli Zaretskii <eliz@gnu.org>
Tested-By: Guinevere Larsen <guinevere@redhat.com>
Approved-by: Kevin Buettner <kevinb@redhat.com>
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This introduces a new '--no-escape-args' option for gdb and gdbserver.
I (Andrew Burgess) have based this patch from work done in this
series:
https://inbox.sourceware.org/gdb-patches/20211022071933.3478427-1-m.weghorn@posteo.de/
I have changed things slightly from the original series. I think this
work is close enough that I've left the original author (Michael) in
place and added myself as co-author. Any bugs introduced by my
modifications to the original patch should be considered mine. I've
also added documentation and tests which were missing from the
originally proposed patch.
When the startup-with-shell option is enabled, arguments passed
directly as 'gdb --args <args>' or 'gdbserver <args>', are by default
escaped so that they are passed to the inferior as passed on the
command line, no globbing or variable substitution happens within the
shell GDB uses to start the inferior.
For gdbserver, this is the case since commit:
commit bea571ebd78ee29cb94adf648fbcda1e109e1be6
Date: Mon May 25 11:39:43 2020 -0400
Use construct_inferior_arguments which handles special chars
Only arguments set via 'set args <args>', 'run <args>', or through the
Python API are not escaped in standard upstream GDB right now.
For the 'gdb --args' case, directly setting unescaped args on gdb
invocation is possible e.g. by using the "--eval-command='set args
<args>'", while this possibility does not exist for gdbserver.
This commit adds a new '--no-escape-args' command line option for GDB
and gdbserver. This option is used with GDB as a replacement for the
current '--args' option, and for gdbserver this new option is a flag
which changes how gdbserver handles inferior arguments on the command
line. When '--no-escape-args' is used inferior arguments passed on
the command line will not have escaping added by GDB or gdbserver.
For gdbserver, using this new option allows having the behaviour from
before commit bea571ebd78ee29cb94adf648fbcda1e109e1be6, while keeping
the default behaviour unified between GDB and GDBserver.
For GDB the --no-escape-args option can be used as a replacement for
--args, like this:
shell> gdb --no-escape-args my-program arg1 arg2 arg3
While for gdbserver, the --no-escape-args option is a flag, which can
be used like:
shell> gdbserver --no-escape-args --once localhost:54321 \
my-program arg1 arg2 arg3
Co-Authored-By: Andrew Burgess <aburgess@redhat.com>
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=28392
Reviewed-By: Eli Zaretskii <eliz@gnu.org>
Tested-By: Guinevere Larsen <guinevere@redhat.com>
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As reported in PR libsframe/33168, the libsframe tests don't build on
Solaris. The failure is
In file included from libsframe/testsuite/libsframe.decode/be-flipping.c:28:
/usr/include/dejagnu.h:48:1: error: conflicting types for ‘wait’; have ‘void(void)’
48 | wait (void)
| ^~~~
In file included from /usr/include/stdlib.h:16,
from libsframe/testsuite/libsframe.decode/be-flipping.c:21:
/usr/include/sys/wait.h:85:14: note: previous declaration of ‘wait’ with type ‘pid_t(int *)’ {aka ‘long int(int *)’}
85 | extern pid_t wait(int *);
| ^~~~
We have a combination of two factors here:
* Solaris <stdlib.h> has
and configure.ac predefines __EXTENSIONS__ due to the use of
AC_USE_SYSTEM_EXTENSIONS.
* This conflicts with <dejagnu.h>'s definition
void
wait (void)
{
...
}
While this version of wait was removed in upstream DejaGnu, the removal
only happened after the latest release, 1.6.3.
To avoid this, I've moved all testsuite includes into a new
sframe-test.h, adding a workaround for the wait conflict.
-Wall and -I$(srcdir) have been removed from AM_CPPFLAGS since they
don't seem to be needed. To fix the Makefile fragment duplication, the
local.mk files now use $(testsuite_LDADD) and $(testsuite_CPPFLAGS)
throughout.
Tested on {i386,amd64}-pc-solaris2.11, {sparc,sparcv9}-sun-solaris2.11,
{x86_64,i686}-pc-linux-gnu, and amd64-pc-freebsd14.0.
Coauthored-By: Alan Modra <amodra@gmail.com>
2025-08-31 Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
Alan Modra <amodra@gmail.com>
libsframe:
PR libsframe/33168
* testsuite/sframe-test.h: New file.
* testsuite/libsframe.decode/be-flipping.c: Replace includes by
sframe-test.h.
* testsuite/libsframe.decode/frecnt-1.c: Likewise.
* testsuite/libsframe.decode/frecnt-2.c: Likewise.
* testsuite/libsframe.encode/encode-1.c: Likewise.
* testsuite/libsframe.find/findfre-1.c: Likewise.
* testsuite/libsframe.find/findfunc-1.c: Likewise.
* testsuite/libsframe.find/plt-findfre-1.c: Likewise.
* testsuite/libsframe.find/plt-findfre-2.c: Likewise.
* Makefile.am (AM_CPPFLAGS): Remove -I$(srcdir).
* Makefile.in: Regenerate.
* testsuite/local.mk (testsuite_LDADD): New variable.
(testsuite_CPPFLAGS): Likewise.
* testsuite/libsframe.decode/local.mk: Use $(testsuite_LDADD),
$(testsuite_CPPFLAGS).
* testsuite/libsframe.encode/local.mk: Likewise.
* testsuite/libsframe.find/local.mk: Likewise.
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Running tclint on the test-cases in gdb.testsuite shows a few problems:
...
board-sanity.exp:47:38: line has trailing whitespace [trailing-whitespace]
board-sanity.exp:83:1: line has trailing whitespace [trailing-whitespace]
board-sanity.exp:95:38: line has trailing whitespace [trailing-whitespace]
gdb-caching-proc-consistency.exp:66:2: expected braced word or word without \
substitutions in argument interpreted as expr [command-args]
gdb-caching-proc-consistency.exp:117:12: eval received an argument with a \
substitution, unable to parse its arguments [command-args]
with-override.exp:53:18: expression with substitutions should be enclosed by \
braces [unbraced-expr]
with-override.exp:57:18: expression with substitutions should be enclosed by \
braces [unbraced-expr]
...
Fix these.
Tested on x86_64-linux.
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Test-case gdb.testsuite/lmap.exp was added to test a local definition of lmap
in lib/gdb.exp.
That one has been removed in commit e447f3a122c ("Require Tcl 8.6.2").
Remove the unnecessary test-case.
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Well these testcases cannot be fixed by .option norvc simply, that is because
current linker needs to check mapping symbols before doing any rvc relaxations,
https://github.com/riscv-non-isa/riscv-elf-psabi-doc/pull/393
Once we support the above features, we can revert this patch.
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Same as cabae1c1c87d5f4ba28b7fdafe735b7c6207fb78
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This patch adds a test case to test that the previous two patches did
their job.
With the current gdb, this test fails:
(gdb) print some_regular_access.all
Value out of range.
The bug here is that the array has an index type that is wider than
'int', which is perfectly acceptable in Ada.
Note that this series doesn't quite go far enough: in Ada the index
could be a 128-bit integer. This change would be more invasive; and
in practice this doesn't really seem to come up much -- so I've
deferred it.
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This patch started by removing the remaining calls to longest_to_int
from ada-lang.c, then chasing down the callees to make sure they were
also using LONGEST. This ended up with a small change to value_slice
as well.
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A few spots in ada-lang.c use longest_to_int -- but in a context where
the value is immediately passed to a function accepting LONGEST. This
patch removes the offending calls. It turned out to be easy to change
find_struct_field as well, so I've included that in this patch.
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When running tclint with lib/future.exp, I get:
...
$ tclint lib/future.exp
$exp:756:5: redefinition of built-in command 'lreverse' [redefined-builtin]
...
The code was added to handle pre-7.5 tcl versions without lreverse.
Since we now require Tcl 8.6.2 (as per PR testsuite/33205), drop this.
Tested by rerunning tclint.
Approved-By: Simon Marchi <simon.marchi@efficios.com>
PR testsuite/33403
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=33403
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When running tclint with gdb.base/dtrace-probe.exp I get:
...
$ tclint gdb.base/dtrace-probe.exp
$exp:67:45: syntax error: expected newline or semicolon, got ]
...
due to these lines:
...
67 runto "-probe-dtrace test:two-locations"]
68 runto "-probe-dtrace test:two-locations"]
...
Fix this by dropping the trailing ']'.
Tested by rerunning tclint.
Approved-By: Simon Marchi <simon.marchi@efficios.com>
PR testsuite/33403
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=33403
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gdb.trace/mi-traceframe-changed.exp
When running tclint on gdb.trace/mi-traceframe-changed.exp, I get:
...
$ tclint gdb.trace/mi-traceframe-changed.exp
$exp:94:1: unrecognized argument for append: -1 [command-args]
$exp:95:1: unrecognized argument for append: -1 [command-args]
...
for these lines:
...
94 append testfile -1
95 append binfile -1
...
This seems harmless to me, but since tclint complains, fix this by quoting the
-1 arguments.
Tested by rerunning tclint.
Approved-By: Simon Marchi <simon.marchi@efficios.com>
PR testsuite/33403
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=33403
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Copy non_got_ref_without_indirect_extern_access when copying indirect
symbol for weak alias so that _bfd_x86_elf_adjust_dynamic_symbol will
properly handle GNU_PROPERTY_1_NEEDED_INDIRECT_EXTERN_ACCESS.
bfd/
PR ld/33409
* elfxx-x86.c (_bfd_x86_elf_copy_indirect_symbol): Copy
non_got_ref_without_indirect_extern_access.
ld/
PR ld/33409
* testsuite/config/default.exp (NO_DIRECT_EXTERN_ACCESS_CFLAGS):
New.
* testsuite/ld-elf/shared.exp: Run PR ld/33409 tests.
* testsuite/ld-elf/pr33409a.c: New file.
* testsuite/ld-elf/pr33409b.c: Likewise.
* testsuite/ld-elf/pr33409c.c: Likewise.
Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
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Change R_X86_64_TPOFF32 error message from
relocation R_X86_64_TPOFF32 against symbol `foo' can not be used when making a shared object; replace local-exec with initial-exec TLS model
to
relocation R_X86_64_TPOFF32 against symbol `foo' can not be used when making a shared object; local-exec is incompatible with -shared
bfd/
PR ld/33408
* elf64-x86-64.c (elf_x86_64_need_pic): Suggest "replace
local-exec with initial-exec TLS model" for R_X86_64_TPOFF32.
ld/
PR ld/33408
* testsuite/ld-x86-64/tls-le-pic-1-x32.d: Updated.
* testsuite/ld-x86-64/tls-le-pic-1.d: Likewise.
* testsuite/ld-x86-64/tls-le-pic-2-x32.d: Likewise.
* testsuite/ld-x86-64/tls-le-pic-2.d: Likewise.
* testsuite/ld-x86-64/tls-le-pic-3-x32.d: Likewise.
* testsuite/ld-x86-64/tls-le-pic-3.d: Likewise.
Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
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Add `.option norvc` to several RISC-V tests to avoid compressed
instruction generation. This ensures consistent disassembly and
alignment behavior regardless of assembler default options.
Discussion see:
https://patchwork.sourceware.org/project/binutils/patch/20250910120916.1103023-1-jiawei@iscas.ac.cn/
gas/ChangeLog:
* testsuite/gas/riscv/dis-partial-insn.s: Limit compressed.
* testsuite/gas/riscv/no-relax-align.s: Ditto.
* testsuite/gas/riscv/odd-padding.s: Ditto.
* testsuite/gas/riscv/t_insns.s: Ditto.
* testsuite/gas/riscv/tlsdesc.s: Ditto.
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When debugging functions where a callee-saved register is moved to a
register of a larger size (e.g., a 64-bit general-purpose register to
a 128-bit vector register), GDB would crash when the user issued the
"return" command. For example:
ldgr %f0, %r11 ; Move 64-bit general-purpose register (r11)
; to 128-bit vector register (f0)
.cfi_register r11, f0 ; DW_CFA_register: r11 is stored in f0
...
lgdr %r11, %f0 ; Restore r11 from f0
.cfi_restore r11 ; DW_CFA_restore: r11 is restored to its original
; register
(This example uses instructions and registers for the S390x architecture,
where this bug was originally found.)
If GDB is stopped in the "..." section and the user issues the
"return" command, GDB crashes due to a buffer size mismatch during
unwinding. Specifically, in frame_register_unwind in frame.c, a
buffer the size of the original register (the 64-bit r11 in this
example) has been allocated and GDB would like to use memcpy to copy
the contents of the register where the original register was saved
(the 128-bit f0) to the buffer for the original register. But,
fortunately, GDB has an assertion which prevents this from happening:
gdb_assert (buffer.size () >= value->type ()->length ());
This patch ensures that GDB uses the original register's type (e.g.,
r11's type) when unwinding, even if it was marked as saved to a differently
typed/sized register (e.g., f0) via .cfi_register (DW_CFA_register).
The fix adds a 'struct type *' parameter to value_of_register_lazy() to
explicitly track the original register's type. The function
frame_unwind_got_register is updated to pass the correct type for the
original register.
The call chain from frame_register_unwind to frame_unwind_got_register
is shown by this backtrace:
#0 frame_unwind_got_register (frame=..., regnum=13, new_regnum=128)
at gdb/frame-unwind.c:300
#1 0x000000000135d894 in dwarf2_frame_prev_register (this_frame=...,
this_cache=0x2204528, regnum=13)
at gdb/dwarf2/frame.c:1187
#2 0x00000000014d9186 in frame_unwind_legacy::prev_register (
this=0x211f428 <dwarf2_frame_unwind>, this_frame=...,
this_prologue_cache=0x2204528, regnum=13) at gdb/frame-unwind.c:401
#3 0x00000000014e1d12 in frame_unwind_register_value (next_frame=...,
regnum=13) at gdb/frame.c:1263
#4 0x00000000014e16b8 in frame_register_unwind (next_frame=..., regnum=13,
optimizedp=0x3ffffff813c, unavailablep=0x3ffffff8138,
lvalp=0x3ffffff8134, addrp=0x3ffffff8128, realnump=0x3ffffff8124,
buffer=...) at gdb/frame.c:1189
The register numbers shown above are for s390x. On s390x,
S390_R11_REGNUM has value 13. Vector registers (like f0) are numbered
differently from floating-point registers of the same name, leading to
regnum 128 for f0 despite S390_F0_REGNUM being assigned a different
value in s390-tdep.h.
New test cases for aarch64 and x86_64 check for this on more popular
architectures and also without dependency on a particular compiler to
generate an unusual prologue in which a general purpose register is
being moved to a vector register. In both cases, the test simulates
the bug found on s390x where a 64-bit frame pointer was being moved to
a much wider vector register. These test cases will cause an internal
error on their respective architecture, but will pass with this fix in
place.
When tested on s390x linux (native), this change fixes 59 GDB internal
errors and around 200 failures overall. This is the list of internal
errors that no longer occur on s390x:
FAIL: gdb.base/call-sc.exp: tc: return foo; return call-sc-tc (GDB internal error)
FAIL: gdb.base/call-sc.exp: td: return foo; return call-sc-td (GDB internal error)
FAIL: gdb.base/call-sc.exp: te: return foo; return call-sc-te (GDB internal error)
FAIL: gdb.base/call-sc.exp: tf: return foo; return call-sc-tf (GDB internal error)
FAIL: gdb.base/call-sc.exp: ti: return foo; return call-sc-ti (GDB internal error)
FAIL: gdb.base/call-sc.exp: tl: return foo; return call-sc-tl (GDB internal error)
FAIL: gdb.base/call-sc.exp: tld: return foo; return call-sc-tld (GDB internal error)
FAIL: gdb.base/call-sc.exp: tll: return foo; return call-sc-tll (GDB internal error)
FAIL: gdb.base/call-sc.exp: ts: return foo; return call-sc-ts (GDB internal error)
FAIL: gdb.base/gnu_vector.exp: return from vector-valued function (GDB internal error)
FAIL: gdb.base/return-3.exp: in foo: return (GDB internal error)
FAIL: gdb.base/return-nodebug.exp: double: return from function with no debug info with a cast (GDB internal error)
FAIL: gdb.base/return-nodebug.exp: float: return from function with no debug info with a cast (GDB internal error)
FAIL: gdb.base/return-nodebug.exp: int: return from function with no debug info with a cast (GDB internal error)
FAIL: gdb.base/return-nodebug.exp: long-long: return from function with no debug info with a cast (GDB internal error)
FAIL: gdb.base/return-nodebug.exp: long: return from function with no debug info with a cast (GDB internal error)
FAIL: gdb.base/return-nodebug.exp: short: return from function with no debug info with a cast (GDB internal error)
FAIL: gdb.base/return-nodebug.exp: signed-char: return from function with no debug info with a cast (GDB internal error)
FAIL: gdb.base/return.exp: return value 5 (GDB internal error)
FAIL: gdb.base/return.exp: return value 5.0 (GDB internal error)
FAIL: gdb.base/return2.exp: return from char_func (GDB internal error)
FAIL: gdb.base/return2.exp: return from double_func (GDB internal error)
FAIL: gdb.base/return2.exp: return from float_func (GDB internal error)
FAIL: gdb.base/return2.exp: return from int_func (GDB internal error)
FAIL: gdb.base/return2.exp: return from long_func (GDB internal error)
FAIL: gdb.base/return2.exp: return from long_long_func (GDB internal error)
FAIL: gdb.base/return2.exp: return from short_func (GDB internal error)
FAIL: gdb.base/return2.exp: return from void_func (GDB internal error)
FAIL: gdb.base/sigstep.exp: return from handleri: leave handler (GDB internal error)
FAIL: gdb.base/structs.exp: types=tc-ti: return foo<n>; return 2 structs-tc-ti (GDB internal error)
FAIL: gdb.base/structs.exp: types=tc-tl: return foo<n>; return 2 structs-tc-tl (GDB internal error)
FAIL: gdb.base/structs.exp: types=tc-ts: return foo<n>; return 2 structs-tc-ts (GDB internal error)
FAIL: gdb.base/structs.exp: types=tc: return foo<n>; return 1 structs-tc (GDB internal error)
FAIL: gdb.base/structs.exp: types=tc: return foo<n>; return 2 structs-tc (GDB internal error)
FAIL: gdb.base/structs.exp: types=tc: return foo<n>; return 3 structs-tc (GDB internal error)
FAIL: gdb.base/structs.exp: types=tc: return foo<n>; return 4 structs-tc (GDB internal error)
FAIL: gdb.base/structs.exp: types=tc: return foo<n>; return 5 structs-tc (GDB internal error)
FAIL: gdb.base/structs.exp: types=tc: return foo<n>; return 6 structs-tc (GDB internal error)
FAIL: gdb.base/structs.exp: types=tc: return foo<n>; return 7 structs-tc (GDB internal error)
FAIL: gdb.base/structs.exp: types=tc: return foo<n>; return 8 structs-tc (GDB internal error)
FAIL: gdb.base/structs.exp: types=td-tf: return foo<n>; return 2 structs-td-tf (GDB internal error)
FAIL: gdb.base/structs.exp: types=td: return foo<n>; return 1 structs-td (GDB internal error)
FAIL: gdb.base/structs.exp: types=tf-tc: return foo<n>; return 2 structs-tf-tc (GDB internal error)
FAIL: gdb.base/structs.exp: types=tf-td: return foo<n>; return 2 structs-tf-td (GDB internal error)
FAIL: gdb.base/structs.exp: types=tf: return foo<n>; return 1 structs-tf (GDB internal error)
FAIL: gdb.base/structs.exp: types=tf: return foo<n>; return 2 structs-tf (GDB internal error)
FAIL: gdb.base/structs.exp: types=ti-tc: return foo<n>; return 2 structs-ti-tc (GDB internal error)
FAIL: gdb.base/structs.exp: types=ti: return foo<n>; return 1 structs-ti (GDB internal error)
FAIL: gdb.base/structs.exp: types=ti: return foo<n>; return 2 structs-ti (GDB internal error)
FAIL: gdb.base/structs.exp: types=tl-tc: return foo<n>; return 2 structs-tl-tc (GDB internal error)
FAIL: gdb.base/structs.exp: types=tl: return foo<n>; return 1 structs-tl (GDB internal error)
FAIL: gdb.base/structs.exp: types=tl: return foo<n>; return 2 structs-tl (GDB internal error)
FAIL: gdb.base/structs.exp: types=tld: return foo<n>; return 1 structs-tld (GDB internal error)
FAIL: gdb.base/structs.exp: types=tll: return foo<n>; return 1 structs-tll (GDB internal error)
FAIL: gdb.base/structs.exp: types=ts-tc: return foo<n>; return 2 structs-ts-tc (GDB internal error)
FAIL: gdb.base/structs.exp: types=ts: return foo<n>; return 1 structs-ts (GDB internal error)
FAIL: gdb.base/structs.exp: types=ts: return foo<n>; return 2 structs-ts (GDB internal error)
FAIL: gdb.base/structs.exp: types=ts: return foo<n>; return 3 structs-ts (GDB internal error)
FAIL: gdb.base/structs.exp: types=ts: return foo<n>; return 4 structs-ts (GDB internal error)
I have tested this commit on Fedora Linux, with architectures s390x,
x86_64, x86_64/-m32, aarch64, ppc64le, and riscv64, with no
regressions found.
This v2 version makes some changes suggested by Andrew Burgess: It
adds an assert to frame_unwind_got_register() and always passes the
type of REGNUM to value_of_register_lazy(). It also updates value.h's
comment describing value_of_register_lazy().
In his approval message, Andrew requested some changes to the tests.
Those have been made exactly as requested.
Approved-By: Andrew Burgess <aburgess@redhat.com>
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After this series, expand_symtabs_matching is now misnamed. This
patch renames it, renames some associated types, and also fixes up
some comments that I previously missed.
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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The "enter_symbol_lookup" class was introduced to work around the lack
of reentrancy in symbol lookup. There were two problems here:
1. The DWARF reader kept a mark bit on the dwarf2_per_cu_data object.
This bit is gone now, replaced with a local mark vector.
2. Some spots in gdb first examined the expanded symbol tables, and
then on failure expanded some symtabs and searched the newly
expanded ones (skipping previousy-expanded ones). Fixing this has
been the main point of this series.
Now that both of these barriers are gone, I think enter_symbol_lookup
can be removed.
One proof of this idea is that, without the first fix mentioned above,
py-symbol.exp regressed because gdbpy_lookup_static_symbols did not
first ensure that the current language was set -- i.e., there was a
latent bug in the enter_symbol_lookup patch anyway.
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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dw_expand_symtabs_matching_file_matcher is no longer needed outside of
read.c, so it can be made static.
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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This converts lookup_symbol_in_objfile to the callback approach by
removing the call to lookup_symbol_in_objfile_symtabs. (The latter is
not removed as there are still other callers.)
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=16994
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=16998
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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This converts lookup_symbol_via_quick_fns to the callback approach,
merging the search loop and the call to expand_symtabs_matching.
Note that this changes lookup_symbol_via_quick_fns to use a
best_symbol_tracker. Before this patch there was a discrepancy here
between the two search functions.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=16994
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=16998
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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This adds a new best_symbol_tracker struct. This is used to implement
the "best symbol" logic that is used sometimes in symtab.c. This
approach makes it simpler and more efficient to track the "best"
symbol when searching across multiple blocks.
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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One loop in block_lookup_symbol is identical to the code in
block_lookup_symbol_primary. This patch simplifies the former by
having it call the latter.
This removes an assert. However, note that the assert is not needed
-- it does not check any invariant that must be maintained.
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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This changes block_lookup_symbol_primary to accept a lookup_name_info.
This follows the general trend of hoisting these objects to the
outermost layer where they make sense -- somewhat reducing the cost of
using them.
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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This simplifies block_lookup_symbol_primary by using
block_iterator_range.
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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This converts linespec.c:iterate_over_all_matching_symtabs to the
callback approach, merging the search loop and the call to
expand_symtabs_matching.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=16994
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=16998
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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objfile::expand_symtabs_for_function only has a single caller now, so
it can be removed. This also allows us to merge the expansion and
searching phases, as done in other patches in this series.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=16994
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=16998
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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This patch changes basic_lookup_transparent_type to always work via
the "quick" API -- that is, no separate search of the already-expanded
symtabs is needed.
This is more efficient when many CUs have already been expanded. It
also makes the lookup more consistent, as the result is no longer
dependent on the order in which CUs were previously expanded.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=16994
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=16998
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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The last caller of the global expand_symtabs_matching function has
been changed, so now we can remove this function.
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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This converts ada-lang.c:map_matching_symbols to the callback
approach, merging the search loop and the call to
expand_symtabs_matching.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=16994
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=16998
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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This converts ada_language_defn::collect_symbol_completion_matches to
the callback approach, merging the search loop and the call to
expand_symtabs_matching.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=16994
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=16998
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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This converts ada_add_global_exceptions to the callback approach,
merging the search loop and the call to expand_symtabs_matching.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=16994
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=16998
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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This changes gdbpy_lookup_static_symbols to the callback approach,
merging the search loop and the call to expand_symtabs_matching.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=16994
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=16998
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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This converts default_collect_symbol_completion_matches_break_on to
the callback approach, merging the search loop and the call to
expand_symtabs_matching.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=16994
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=16998
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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This patch rewrites the .gdb_index reader to create the same data
structures that are created by the cooked indexer and the .debug_names
reader.
This is done in support of this series; but also because, from what I
can tell, the "templates.exp" change didn't really work properly with
this reader.
In addition to fixing that problem, this patch removes a lot of code.
Implementing this required a couple of hacks, as .gdb_index does not
contain all the information that's used by the cooked index
implementation.
* The index-searching code likes to differentiate between the various
DWARF tags when matching, but .gdb_index lumps many things into a
single "other" category. To handle this, we introduce a phony tag
that's used so that the match method can match on multiple domains.
* Similarly, .gdb_index doesn't distinguish between the type and
struct domains, so another phony tag is used for this.
* The reader must attempt to guess the language of various symbols.
This is somewhat finicky. "Plain" (unqualified) symbols are marked
as language_unknown and then a couple of hacks are used to handle
these -- one in expand_symtabs_matching and another when recognizing
"main".
For what it's worth, I consider .gdb_index to be near the end of its
life. While .debug_names is not perfect -- we found a number of bugs
in the standard while implementing it -- it is better than .gdb_index
and also better documented.
After this patch, we could conceivably remove dwarf_scanner_base.
However, I have not done this.
Finally, this patch also changes this reader to dump the content of
the index, as the other DWARF readers do. This can be handy when
debugging gdb.
Acked-By: Simon Marchi <simon.marchi@efficios.com>
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=33316
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Currently, gdb will search the already-expanded symtabs in one loop,
and then also expand matching symtabs in another loop. However, this
is somewhat inefficient -- when searching the already-expanded
symtabs, all such symtabs are examined. However, the various "quick"
implementations already know which subset of symtabs might have a
match.
This changes the contract of expand_symtabs_matching to also call the
callback for an already-expanded symtab. With this change, and some
subsequent enabling changes, the number of searched symtabs should
sometimes be reduced. This also cuts down on the amount of redundant
code.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=16994
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=16998
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30736
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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This removes dwarf2_per_cu_data::mark, replacing it with a
locally-allocated boolean vector. It also inverts the sense of the
flag -- now, the flag is true when a CU should be skipped, and false
when the CU should be further examined. Also, the validity of the
flag is no longer dependent on 'file_matcher != NULL'.
This patch makes the subsequent patch to searching a bit simpler, so
I've separated it out.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=16994
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=16998
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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g++ will sometimes use a typedef to give a name to an otherwise
anonymous type for linkage purposes. gdb tries to handle this odd
scenario, which is enforced by anon-struct.exp.
It's difficult to detect this problem in the current tree, but the
cooked index does not include an entry for these DIEs.
This patch changes gdb to add these to the index. This is needed by
subsequent changes in this series.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=32519
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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When I rewrote the .debug_names writer (commit 91a42a61), I changed
the writer to not import .debug_str into the debug_str_lookup object.
However, a later patch in this series needed this again. The issue
here was that if a name occurs in the DWARF, and is also allocated,
then there is a race, where the created index depends on which DIE is
read first. This can cause index-file.exp failures.
This patch restores the old approach, avoiding this problem. I also
applied a couple of small cleanups to the class. And, I removed the
old complaint from the "ingestion" function, as this was not
necessary.
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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The new approach to searching (solely via the quick API) is more
sensitive to discrepancies between the partial and full readers. In
CTF, there is some disagreement about which scope to use. CTF doesn't
seem to really distinguish between the file and global scope, so this
patch takes the simple approach of putting all CTF symbols into the
global scope.
This changes one test as well. It seems to me that the behavior here
is arbitrary and the test is making unwarranted assumptions.
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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Currently the full symbol reader puts DW_TAG_imported_declaration in
TYPE_DOMAIN, in the global scope. This patch changes the cooked
indexer to follow.
Without this patch, a later patch in the series would cause
nsalias.exp to regress.
This also updates read-gdb-index.c to do something similar.
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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The cooked index does not currently contain entries for Ada import
functions. This means that whether or not these are visible to
"break" depends on which CUs were previously expanded -- clearly a
bug.
This patch fixes the issue. I think the comments in the patch explain
the fix reasonably well.
Perhaps one to-do item here is to change GNAT to use
DW_TAG_imported_declaration for these imports. This may eventually
let us remove some of the current hacks.
This version includes a fix from Simon to initialize the new member.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=32511
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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If you run struct-decl.exp with the .gdb_index board, you will see
that "the_type" is not emitted in the index. This would cause a
failure in this series. The fix is to ensure that certain necessary
type declarations are emitted.
However, a naive fix here will regress stub-array-size.exp, where a
type declaration and a type definition are both seen -- but the
declaration is seen first and causes a failure. This is handled by
adding some code (including a mild hack) to filter out type
declarations when a corresponding type definition is seen.
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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This patch is needed to avoid regressions later in the series.
The issue here is that ada_decode, when called with wide=false, would
act as though the input needed verbatim quoting. That would happen
because the 'W' character would be passed through; and then a later
loop would reject the result due to that character.
Similarly, with operators=false the upper-case-checking loop would be
skipped, but then some names that did need verbatim quoting would pass
through.
Furthermore I noticed that there isn't a need to distinguish between
the "wide" and "operators" cases -- all callers pass identical values
to both.
This patch cleans up the above, consolidating the parameters and
changing how upper-case detection is handled, so that both the
operator and wide cases pass-through without issue. I've added new
unit tests for this.
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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This patch adds another minor hack to cooked_index_entry::full_name.
In particular, if GNAT emits non-hierarchical names (still the default
as the hierarchical series is blocked on one tricky problem), then a
request to compute the "linkage-style" name will now just return the
'name' field.
Without this tweak, this series would regress ada-cold-name.exp,
because the search would look for "name.cold" but the index would
return "name[cold]" as the "linkage" name (which would be wrong).
This area is a bit difficult to unravel. The best plan here, IMO, is
to change Ada to work like the other languages in gdb: store the
natural name and do searches with that name. I think this is
achievable, but I didn't want to try it here.
I've updated the relevant bug (tagged below) to reflect this.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=32766
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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This series pointed out a few tests that check that a particular index
is in use. It seems to me that this does not really make sense when
the "readnow" board is in use, as this actually skips index creation.
The tests do pass today, but by accident. This patch adds the
appropriate "require" line to the tests in question.
Approved-By: Simon Marchi <simon.marchi@efficios.com>
Acked-By: Simon Marchi <simon.marchi@efficios.com>
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