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When building gdb with CFLAGS=-std=gnu17 and CXXFLAGS=-std=gnu++17 and running
test-case gdb.tui/new-layout.exp, we run into:
...
UNRESOLVED: gdb.tui/new-layout.exp: left window box after shrink (ll corner)
FAIL: gdb.tui/new-layout.exp: right window box after shrink (ll corner)
...
In a minimal form, we run into an abort when issuing a winheight command:
...
$ gdb -tui -ex "winheight src - 5"
<tui stuff>
Aborted (core dumped)
$
...
with this backtrace at the abort:
...
\#0 0x0000000000438db0 in std::char_traits<char>::length (__s=0x0)
at /usr/include/c++/9/bits/char_traits.h:335
\#1 0x000000000043b72e in std::basic_string_view<char, \
std::char_traits<char> >::basic_string_view (this=0x7fffffffd4f0, \
__str=0x0) at /usr/include/c++/9/string_view:124
\#2 0x000000000094971b in tui_partial_win_by_name (name="src")
at src/gdb/tui/tui-win.c:663
...
due to a NULL comparison which constructs a string_view object from NULL:
...
657 /* Answer the window represented by name. */
658 static struct tui_win_info *
659 tui_partial_win_by_name (gdb::string_view name)
660 {
661 struct tui_win_info *best = nullptr;
662
663 if (name != NULL)
...
In gdbsupport/gdb_string_view.h, we either use:
- gdb's copy of libstdc++-v3/include/experimental/string_view, or
- the standard implementation of string_view, when built with C++17 or later
(which in gcc's case comes from libstdc++-v3/include/std/string_view)
In the first case, there's support for constructing a string_view from a NULL
pointer:
...
/*constexpr*/ basic_string_view(const _CharT* __str)
: _M_len{__str == nullptr ? 0 : traits_type::length(__str)},
_M_str{__str}
{ }
...
but in the second case, there's not:
...
__attribute__((__nonnull__)) constexpr
basic_string_view(const _CharT* __str) noexcept
: _M_len{traits_type::length(__str)},
_M_str{__str}
{ }
...
Fix this by removing the NULL comparison altogether.
Build on x86_64-linux with CFLAGS=-std=gnu17 and CXXFLAGS=-std=gnu++17, and
tested.
gdb/ChangeLog:
2020-07-06 Tom de Vries <tdevries@suse.de>
PR tui/26205
* tui/tui-win.c (tui_partial_win_by_name): Don't test for NULL name.
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* readelf.c (print_dynamic_symbol): Don't sprintf to buffer to
find string length.
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When compiling gdb with -std=gnu++17, we run into:
...
../../gdb/inferior.h: In member function ‘void \
infcall_suspend_state_deleter::operator()(infcall_suspend_state*) const’:
../../gdb/inferior.h:83:12: error: ‘bool std::uncaught_exception()’ is \
deprecated [-Werror=deprecated-declarations]
83 | if (!std::uncaught_exception ())
...
Fix this by rewriting using std::uncaught_exceptions.
Tested on x86_64-linux with gcc 9.3.1 and -std=gnu17/gnu++17.
Tested with test-case from RFC patch
https://sourceware.org/pipermail/gdb-patches/2020-June/169970.html.
gdb/ChangeLog:
2020-07-05 Tom de Vries <tdevries@suse.de>
PR build/26187
* inferior.h (struct infcall_suspend_state_deleter): If available, use
std::uncaught_exceptions instead of deprecated
std::uncaught_exception.
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The change to macro_stringify is straightforward. This allows removing
the manual memory management in fixup_definition.
gdb/ChangeLog:
* macroexp.h (macro_stringify): Return
gdb::unique_xmalloc_ptr<char>.
* macroexp.c (macro_stringify): Likewise.
* macrotab.c (fixup_definition): Update.
Change-Id: Id7db8988bdbd569dd51c4f4655b00eb26db277cb
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For some reason, macro_expand_next does not return a
gdb::unique_xmalloc_ptr<char>, like its counterparts macro_expand and
macro_expand_once. This patch fixes that.
macro_buffer::release now returns a gdb::unique_xmalloc_ptr<char> too,
which required updating the other callers. The `.release (). release
()` in macro_stringify looks a bit funny, but it's because one release
is for the macro_buffer, and the other is for the unique ptr.
I removed the ATTRIBUTE_UNUSED_RESULT on macro_buffer::release, I don't
really understand why it's there. I don't see how this method could be
called without using the result, that would be an obvious memory leak.
The commit that introduced it (4e4a8b932b7 "Add ATTRIBUTE_UNUSED_RESULT
to macro_buffer") doesn't give any details.
gdb/ChangeLog:
* c-exp.y (scan_macro_expansion): Don't free `expansion`.
(lex_one_token): Update.
* macroexp.c (struct macro_buffer) <release>: Return
gdb::unique_xmalloc_ptr<char>.
(macro_stringify): Update.
(macro_expand): Update.
(macro_expand_next): Return gdb::unique_xmalloc_ptr<char>.
* macroexp.h (macro_expand_next): Likewise.
Change-Id: I67a74d0d479d2c20cdc82161ead7c54cea034f56
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I started to look into changing the callbacks in macroexp.h to use
gdb::function_view. However, I noticed that the passed lookup function
was always `standard_macro_lookup`, which looks up a macro in a
`macro_scope` object. Since that doesn't look like a very useful
abstraction, it would be simpler to just pass the scope around and have
the various functions call standard_macro_lookup themselves. This is
what this patch does.
gdb/ChangeLog:
* macroexp.h (macro_lookup_ftype): Remove.
(macro_expand, macro_expand_once, macro_expand_next): Remove
lookup function parameters, add scope parameter.
* macroexp.c (scan, substitute_args, expand, maybe_expand,
macro_expand, macro_expand_once, macro_expand_next): Likewise.
* macroscope.h (standard_macro_lookup): Change parameter type
to macro_scope.
* macroscope.c (standard_macro_lookup): Likewise.
* c-exp.y (lex_one_token): Update.
* macrocmd.c (macro_expand_command): Likewise.
(macro_expand_once_command): Likewise.
Change-Id: Id2431b1489359e1b0274dc2b81e5ea5d225d730c
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GCC 10 enables -fno-common by default. This resulted in multiple
definition linker errors since a global variable was declared and
defined in a header file:
ld: libsim.a(idecode.o):sim/v850/idecode.h:71: multiple definition of
`idecode_issue'; libsim.a(irun.o):sim/v850/idecode.h:71: first defined
here
ld: libsim.a(engine.o):sim/v850/idecode.h:71: multiple definition of
`idecode_issue'; libsim.a(irun.o):sim/v850/idecode.h:71: first defined
here
ld: libsim.a(support.o):sim/v850/idecode.h:71: multiple definition of
`idecode_issue'; libsim.a(irun.o):sim/v850/idecode.h:71: first defined
here
ld: libsim.a(semantics.o):sim/v850/idecode.h:71: multiple definition
of `idecode_issue'; libsim.a(irun.o):sim/v850/idecode.h:71: first
defined here
sim/igen
PR sim/26194
* lf.h (lf_get_file_type): Declare.
* lf.c (lf_get_file_type): Define.
* gen-idecode.c (print_idecode_issue_function_header): Use
lf_get_file_type() to issue an extern variable declaration in
case of header files.
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GCC 10 enables -fno-common by default. This resulted in a multiple
definition linker error since global variables were declared and defined
in a header file:
ld: ld-insn.o:sim/ppc/ld-insn.h:221: multiple definition of
`max_model_fields_len'; igen.o:sim/ppc/ld-insn.h:221: first defined here
sim/ppc
* ld-insn.h (last_model, last_model_data, last_model_function,
last_model_internal, last_model_macro, last_model_static):
Delete.
(max_model_fields_len, model_data, model_functions,
model_internal, model_macros, model_static, models): Declare, but do not
define.
* ld-insn.c (last_model, last_model_data, last_model_function,
last_model_internal, last_model_macro, last_model_static,
max_model_fields_len, model_data, model_functions,
model_internal, model_macros, model_static, models): Define.
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gdb.base/structs2.exp fails to run with Clang, because of:
gdb compile failed, /home/pedro/gdb/mygit/src/gdb/testsuite/gdb.base/structs2.c:16:14: warning:
implicit conversion from 'int' to 'signed char' changes value from 130 to
-126 [-Wconstant-conversion]
param_reg (130, 120, 33000, 32000);
~~~~~~~~~ ^~~
/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.base/structs2.c:16:24: warning:
implicit conversion from 'int' to 'short' changes value from 33000 to
-32536 [-Wconstant-conversion]
param_reg (130, 120, 33000, 32000);
~~~~~~~~~ ^~~~~
2 warnings generated.
=== gdb Summary ===
# of untested testcases 1
Fix it by passing actual negative numbers.
gdb/testsuite/ChangeLog:
* gdb.base/structs2.c (main): Adjust second parem_reg call to
explicitly write negative numbers.
* gdb.base/structs2.exp: Adjust expected output.
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gdb.base/charset.exp fails to run with Clang, because of:
gdb compile failed, /home/pedro/gdb/mygit/src/gdb/testsuite/gdb.base/charset.c:144:20: warning:
implicit conversion from 'int' to 'char' changes value from 162 to -94
[-Wconstant-conversion]
11, 162, 17);
^~~
/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.base/charset.c:151:16: warning:
implicit conversion from 'int' to 'char' changes value from 167 to -89
[-Wconstant-conversion]
167,
^~~
/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.base/charset.c:168:16: warning:
implicit conversion from 'int' to 'char' changes value from 167 to -89
[-Wconstant-conversion]
167,
^~~
3 warnings generated.
=== gdb Summary ===
# of untested testcases 1
Fix it by changing init_string to take unsigned char parameters.
gdb/testsuite/ChangeLog:
* gdb.base/charset.c (init_string): Change all char parameters to
unsigned char parameters.
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The gdb.base/call-sc.exp, gdb.base/structs.exp and
gdb.base/structs2.exp testcases still try compiling the sources with
-DNO_PROTOTYPES, but the corresponding sources don't have any #ifdef
NO_PROTOTYPES any longer. Those were removed throughout years ago.
OTOH, gdb.base/ovlymgr.h does check for NO_PROTOTYPES, but no .exp
file compiles it with -DNO_PROTOTYPES.
gdb.base/reread.exp and gdb.base/varargs.exp set a 'prototypes'
global, which is a stale bit left behind when the "try-compiling
without and then with -DNO_PROTOTYPES" logic was around.
gdb/testsuite/ChangeLog:
* gdb.base/call-sc.exp (start_scalars_test): Use
prepare_for_testing and don't try compiling with -DNO_PROTOTYPES.
* gdb.base/overlays.c: Remove references to PARAMS.
* gdb.base/ovlymgr.h (PARAMS): Delete, and remove all references.
* gdb.base/reread.exp: Don't set 'prototypes' global.
* gdb.base/structs.exp (start_structs_test): Use
prepare_for_testing and don't try compiling with -DNO_PROTOTYPES.
* gdb.base/structs2.exp: Don't set 'prototypes' global. Use
prepare_for_testing and don't try compiling with -DNO_PROTOTYPES.
Don't issue "set width 0". Remove gdb_stop_suppressing_tests
call.
* gdb.base/varargs.exp: Don't set 'prototypes' global.
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D10V support was removed years ago, but the gdb.base/d10vovly.c file
stayed behind. Looking a bit closer, I can't find anywhere that
references gdb.base/m32rovly.c either.
Both gdb.base/m32rovly.c and gdb.base/d10vovly.c seem to be older
copies of gdb.base/ovlymgr.c, that are exactly the same, except for
some cosmetic differences, and for missing _ovly_debug_event. Note
that gdb.base/ovlymgr.c has the #ifdef __M32R__ bits too. Note also
that gdb.base/overlays.exp is currently only supported on m32r, and
that uses ovlymgr.c not gdb.base/m32rovly.c.
gdb/testsuite/ChangeLog:
* gdb.base/d10vovly.c: Delete.
* gdb.base/m32rovly.c: Delete.
* gdb.base/ovlymgr.c: Remove all code guarded by __D10V__.
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Fixes some fallout from git commit 0942c7ab94e5.
PR 26028
gas/
* testsuite/gas/ia64/unwind-ilp32.d: Add -T to readelf options.
gold/
* testsuite/Makefile.am (file_in_many_sections.stdout): Add -W
to readelf options.
* testsuite/Makefile.in: Regenerate.
ld/
* testsuite/ld-arm/arm-elf.exp (vxworks1): Pass --wide to readelf
when dumping relocs.
* testsuite/ld-i386/i386.exp (vxworks1): Likewise.
* testsuite/ld-sh/sh-vxworks.exp (vxworks1): Likewise.
* testsuite/ld-sparc/sparc.exp (vxworks1): Likewise.
* testsuite/ld-arm/vxworks1.rd: Adjust to suit.
* testsuite/ld-i386/vxworks1.rd: Adjust.
* testsuite/ld-sh/vxworks1.rd: Adjust.
* testsuite/ld-sparc/vxworks1.rd: Adjust.
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We check register-only source operand to decide if two source operands of
VEX encoded instructions should be swapped. But source operands in AMX
instructions with two source operands swapped are all register-only
operand. Add SwapSources to indicate two source operands should be
swapped.
gas/
* config/tc-i386.c (build_modrm_byte): Check vexswapsources to
swap two source operands.
opcodes/
* i386-gen.c (opcode_modifiers): Add VexSwapSources.
* i386-opc.h (VexSwapSources): New.
(i386_opcode_modifier): Add vexswapsources.
* i386-opc.tbl: Add VexSwapSources to BMI2 and BMI instructions
with two source operands swapped.
* i386-tbl.h: Regenerated.
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* testsuite/gas/all/fill-1.d: Skip for MeP targets.
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This patch fixes a segfault which occurs when the AArch64 backend parses
a symbol operand that begins with a register name and ends with a
unicode byte (byte value > 127).
For example, the following input causes the crash:
x0é: udf x0é
gas/ChangeLog:
2020-07-02 Alex Coplan <alex.coplan@arm.com>
* config/tc-aarch64.c (reg_name_p): Fix cast so that we don't
segfault on negative chars.
* testsuite/gas/aarch64/reglike-label-unicode-segv.d: New test.
* testsuite/gas/aarch64/reglike-label-unicode-segv.s: Input.
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I noticed that fetch_inferior_event receives the client_data parameter
from its caller, inferior_event_handler, but doesn't actually need it.
This patch removes it. In turn, inferior_event_handler doesn't use its
parameter, so remove it too.
The `data` argument used when registering
remote_async_inferior_event_handler is changed to NULL, to avoid
confusion. It could make people think that the value passed is used
somewhere, when in fact it's not.
gdb/ChangeLog:
* inf-loop.c (inferior_event_handler): Remove client_data param.
* inf-loop.h (inferior_event_handler): Likewise.
* infcmd.c (step_1): Adjust.
* infrun.c (proceed): Adjust.
(fetch_inferior_event): Remove client_data param.
(infrun_async_inferior_event_handler): Adjust.
* infrun.h (fetch_inferior_event): Remove `void *` param.
* linux-nat.c (handle_target_event): Adjust.
* record-btrace.c (record_btrace_handle_async_inferior_event):
Adjust.
* record-full.c (record_full_async_inferior_event_handler):
Adjust.
* remote.c (remote_async_inferior_event_handler): Adjust.
Change-Id: I3c2aa1eb0ea3e0985df096660d2dcd794674f2ea
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if they are going to be truncated then "[...]" is displayed at the end. Add a comment line option to disable this enhancement and restore the old behaviour.
PR 26028
binutils* readelf.c (print_symbol): Handle truncation of symbol names.
(options): Add -T/--silent-truncation option.
(parse_args): Handle the option.
(print_dynamic_symbol): Correct calculation of width available to
display symbol name.
* doc/binutils.texi: Document the -T option to readelf.
* NEWS: Mention the new feature.
gas * testsuite/gas/ia64/group-2.d: Add -T option to readelf
command line.
* testsuite/gas/ia64/unwind.d: Likewise.
* testsuite/gas/mmix/bspec-1.d: Likewise.
* testsuite/gas/mmix/bspec-2.d: Likewise.
* testsuite/gas/mmix/comment-1.d: Likewise.
* testsuite/gas/tic6x/scomm-directive-4.d: Likewise.
ld * testsuite/ld-powerpc/powerpc.exp: Add -T option to readelf
command line when running some tests.
* testsuite/ld-arm/arm-elf.exp: Likewise.
* testsuite/ld-mips-elf/mips-elf.exp: Likewise.
* testsuite/ld-mmix/local1.d: Likewise.
* testsuite/ld-mmix/local3.d: Likewise.
* testsuite/ld-mmix/local5.d: Likewise.
* testsuite/ld-mmix/local7.d: Likewise.
* testsuite/ld-powerpc/powerpc.exp: Likewise.
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It seemed cleaner to me for tui_win_info::name to be pure virtual.
This meant adding a name method to the locator window; but this too
seems like an improvement.
gdb/ChangeLog
2020-07-01 Tom Tromey <tom@tromey.com>
* tui/tui-data.h (struct tui_win_info) <name>: Now pure virtual.
* tui/tui-stack.h (struct tui_locator_window) <name>: New method.
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This merges the tui_gen_win_info base class with tui_win_info;
renaming the resulting class to tui_win_info.
gdb/ChangeLog
2020-07-01 Tom Tromey <tom@tromey.com>
* tui/tui-wingeneral.c (tui_win_info::refresh_window): Move from
tui_gen_win_info.
(tui_win_info::make_window): Merge with
tui_gen_win_info::make_window.
(tui_win_info::make_visible): Move from tui_gen_win_info.
* tui/tui-win.c (tui_win_info::max_width): Move from
tui_gen_win_info.
* tui/tui-layout.h (class tui_layout_window) <m_window>: Change
type.
<window_factory>: Likewise.
* tui/tui-layout.c (tui_win_info::resize): Move from
tui_gen_win_info.
(make_standard_window): Change return type.
(get_locator_window, tui_get_window_by_name): Likewise.
(tui_layout_window::apply): Remove a cast.
* tui/tui-data.h (MIN_WIN_HEIGHT): Move earlier.
(struct tui_win_info): Merge with tui_gen_win_info.
(struct tui_gen_win_info): Remove.
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tui_locator_window is the last remaining concrete child class of
tui_gen_win_info. It seems a bit cleaner to me to flatten the
hierarchy a bit; this patch prepares for that by changing
tui_locator_window to derive from tui_win_info.
gdb/ChangeLog
2020-07-01 Tom Tromey <tom@tromey.com>
* tui/tui-stack.h (struct tui_locator_window): Derive from
tui_win_info.
<do_scroll_horizontal, do_scroll_vertical>: New methods.
<can_box>: New method.
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The tui_locator_window constructor initializes the first character of
two of its members. However, this is actually an error, since these
were changed to be std::string. This removes the erroneous code.
gdb/ChangeLog
2020-07-01 Tom Tromey <tom@tromey.com>
* tui/tui-stack.h (struct tui_locator_window): Remove body.
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There's no deep reason that tui_data_item_window should derive from
tui_gen_win_info -- it currently uses a curses window to render, but
that isn't truly needed, and it adds some hacks to other parts of the
TUI.
This patch changes tui_data_item_window so that it doesn't have a base
class, and updates the register window. This simplifies the code and
enables a subsequent cleanup.
gdb/ChangeLog
2020-07-01 Tom Tromey <tom@tromey.com>
* tui/tui-regs.c (tui_data_window::display_registers_from)
(tui_data_window::display_registers_from)
(tui_data_window::first_data_item_displayed)
(tui_data_window::delete_data_content_windows): Update.
(tui_data_window::refresh_window, tui_data_window::no_refresh):
Remove.
(tui_data_window::check_register_values): Update.
(tui_data_item_window::rerender): Add parameters. Update.
(tui_data_item_window::refresh_window): Remove.
* tui/tui-data.h (struct tui_gen_win_info) <no_refresh>: No longer
virtual.
* tui/tui-regs.h (struct tui_data_item_window): Don't derive from
tui_gen_win_info.
<refresh_window, max_height, min_height>: Remove.
<rerender>: Add parameters.
<x, y, visible>: New members.
(struct tui_data_window) <refresh_window, no_refresh>: Remove.
<m_item_width>: New member.
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tui_data_item_window::item_no is misnamed -- it only can be used for a
register, but it references a "display" number as well. (Based on
other comments I've seen in the past -- most since deleted -- I think
there were plans at one point to display variables in this window as
well. However, this was never implemented.)
This patch renames this member to be more correct.
gdb/ChangeLog
2020-07-01 Tom Tromey <tom@tromey.com>
* tui/tui-regs.c (tui_data_window::show_register_group)
(tui_data_window::check_register_values): Update.
* tui/tui-regs.h (struct tui_data_item_window) <regno>: Rename
from item_no.
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tui_data_window::show_register_group had a useless "if" -- the
condition could never be false. This patch removes it.
gdb/ChangeLog
2020-07-01 Tom Tromey <tom@tromey.com>
* tui/tui-regs.c (tui_data_window::show_register_group): Remove
useless "if".
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The "name" member of tui_data_window was set, but never used. This
removes it.
gdb/ChangeLog
2020-07-01 Tom Tromey <tom@tromey.com>
* tui/tui-regs.c (tui_data_window::show_register_group): Update.
* tui/tui-regs.h (struct tui_data_item_window) <name>: Remove.
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This moves some code out of tui-data.h, to more closely related
places. Some unused forward declarations are also removed.
gdb/ChangeLog
2020-07-01 Tom Tromey <tom@tromey.com>
* tui/tui-stack.c (SINGLE_KEY): Move from tui-data.h
* tui/tui-winsource.h (enum tui_line_or_address_kind)
(struct tui_line_or_address): Move from tui-data.h.
* tui/tui-win.c (DEFAULT_TAB_LEN): Move from tui-data.h.
* tui/tui-data.h (DEFAULT_TAB_LEN): Move to tui-win.c.
(tui_cmd_window, tui_source_window_base, tui_source_window)
(tui_disasm_window): Don't declare.
(enum tui_line_or_address_kind, struct tui_line_or_address): Move
to tui-winsource.h.
(SINGLE_KEY): Move to tui-stack.c.
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tui_expand_tabs only has a single caller. This patch removes this
function, in favor of a tab-expanding variant of string_file. This
simplifies the code somewhat.
gdb/ChangeLog
2020-07-01 Tom Tromey <tom@tromey.com>
* tui/tui-regs.h (struct tui_data_item_window) <content>: Now a
std::string.
* tui/tui-regs.c (class tab_expansion_file): New.
(tab_expansion_file::write): New method.
(tui_register_format): Change return type. Use
tab_expansion_file.
(tui_get_register, tui_data_window::display_registers_from)
(tui_data_item_window::rerender): Update.
* tui/tui-io.h (tui_expand_tabs): Don't declare.
* tui/tui-io.c (tui_expand_tabs): Remove.
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tui_reggroup_completer has an "XXXX" comment suggesting the use of
complete_on_enum. This patch implements this suggestion.
gdb/ChangeLog
2020-07-01 Tom Tromey <tom@tromey.com>
* tui/tui-regs.c (tui_reggroup_completer): Use complete_on_enum.
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LLD from 11 onwards (https://reviews.llvm.org/D81784) uses -1 to
represent a relocation in .debug_line referencing a discarded symbol.
Recognize -1 to fix gdb.base/break-on-linker-gcd-function.exp when the
linker is a newer LLD.
gdb/ChangeLog:
* dwarf2/read.c (lnp_state_machine::check_line_address): Test -1.
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PR 26188
* coffgen.c (coff_find_nearest_line_with_names): Sanity check
raw syment index before dereferencing.
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Currently, GDB rejects the (die) reference form while it accepts exprloc
form. It is allowed in DWARF standard. "Table 7.5: Attribute encodings"
in DWARF5 standard. Flang compiler assigns (die) reference to
DW_AT_associated and DW_AT_allocated for some cases.
gdb/ChangeLog
* dwarf2/read.c (set_die_type): Removed conditions to restrict
forms for DW_AT_associated and DW_AT_allocated attributes,
which is already checked in function attr_to_dynamic_prop.
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Fixes accidental breakage of vxworks by commit bbd19b19e4.
* elf32-i386.c (elf_backend_object_p): Undef for vxworks.
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The xc16x md_apply_fix code is just so broken that in my opinion the
target should never have been accepted, and from a quick look at
commit logs for the target it appears that no one has ever contributed
fixes for anything. This target has just been a 14 year burden on
global binutils and cgen maintainers. That's not how free software is
supposed to work.
bfd/
* config.bfd: Obsolete xc16x.
gas/
* config/tc-xc16x.c (md_apply_fix): Add FIXME.
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* testsuite/gas/all/eqv-dot.d: xfail targets that set linkrelax
in data sections, and mep.
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This updates readline/README to mention the current patchlevel, and
the "git am" approach to importing new upstream patches.
readline/ChangeLog
2020-06-30 Tom Tromey <tom@tromey.com>
* README: Update instructions.
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calling application
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