platform/upstream/gcc.git
2 years ago[Ada] Do not mark user parameters of protected subprograms as artificial
Eric Botcazou [Wed, 24 Aug 2022 19:52:32 +0000 (21:52 +0200)]
[Ada] Do not mark user parameters of protected subprograms as artificial

This occurs because protected subprograms are not translated directly into
object code but first rewritten as a pair of subprograms by the front-end.

gcc/ada/

* exp_ch9.adb (Build_Protected_Spec): Tidy up and propagate the
Comes_From_Source flag onto the new formal parameters.
* sem_ch6.adb (Analyze_Subprogram_Body_Helper): Do not check
references for subprograms generated for protected subprograms.

2 years ago[Ada] Fix issues with compiling ACATS test for user-defined literals
Gary Dismukes [Fri, 19 Aug 2022 22:40:05 +0000 (18:40 -0400)]
[Ada] Fix issues with compiling ACATS test for user-defined literals

The draft ACATS test (which we developed) for the Ada 2022 feature of
user-defined literals has compile-time problems that are fixed with this
set of changes.  Two of these involve the resolution of named numbers
in the context where an implicit literal conversion can occur, and for
equality when a literal or named number is an operand. Furthermore,
the compiler can hang in some cases when a numeric literal is used
in a context where the expected type is a type derived two levels
down from a tagged type that specifies a literal aspect.

gcc/ada/

* sem_res.adb
(Resolve_Equality_Op): Add handling for equality ops with
user-defined literal operands.
* sem_util.ads
(Is_User_Defined_Literal): Update spec comment to indicate
inclusion of named number cases.
* sem_util.adb
(Corresponding_Primitive_Op): Rather than following the chain of
ancestor subprograms via Alias and Overridden_Operation links, we
check for matching profiles between primitive subprograms of the
descendant type and the ancestor subprogram (by calling a new
nested function Profile_Matches_Ancestor). This prevents the
compiler from hanging due to circular linkages via those fields
that can occur between inherited and overriding subprograms
(which might indicate a latent bug, but one that may be rather
delicate to resolve).
(Profile_Matches_Ancestor): New nested subprogram to compare the
profile of a primitive subprogram with the profile of a candidate
ancestor subprogram.
(Is_User_Defined_Literal): Also return True in cases where the
node N denotes a named number (E_Name_Integer and E_Named_Real).

2 years ago[Ada] Remove a no-longer-correct comment
Steve Baird [Wed, 24 Aug 2022 16:11:02 +0000 (09:11 -0700)]
[Ada] Remove a no-longer-correct comment

Remove a comment about the former use of the -gnatd9 switch (that switch is
now unused).

gcc/ada/

* debug.adb: remove a comment.

2 years ago[Ada] Fix bugs in check-related warnings.
Bob Duff [Tue, 23 Aug 2022 16:51:01 +0000 (12:51 -0400)]
[Ada] Fix bugs in check-related warnings.

Make sure warnings about wrong-length aggregates don't get
suppressed. Such a warning (in a with-ed unit) can be the only
explanation for an error about No_Elaboration_Code violations.

Avoid passing a bogus "#" to Error_Msg. We really should never
construct message templates by concatenating strings that can
come from input data, but there are too many cases of that to
clean up. The message template parameters should really be
of a type other than String, to avoid these kinds of bugs,
but again, that's too much work to clean up now.

gcc/ada/

* checks.adb
(Selected_Length_Checks): In the message for an aggregate that has
too few or too many elements, add "!!" to make sure the warning
gets printed in with'ed units. Note that we have to put "!!"
before the "??", because Compile_Time_Constraint_Error detects
warnings by comparing the last character of the message with '?'
(which is bit dubious, but we're not changing that here).
(Length_Mismatch_Info_Message): Use Unat for some things that
can't be negative. Specify Decimal instead of Auto in calls to
UI_Image.
* sem_util.adb
(Compile_Time_Constraint_Error): Minor.
* uintp.adb
(Image_Uint): It's always better to initialize objects on their
declaration.

2 years ago[Ada] Disable Support_Atomic_Primitives on x86_64 VxWorks
Patrick Bernardi [Wed, 24 Aug 2022 14:02:21 +0000 (10:02 -0400)]
[Ada] Disable Support_Atomic_Primitives on x86_64 VxWorks

The current configuration of the x86-64 VxWorks runtimes does not support
atomic primitives. x86-64 VxWorks was missed from the previous patch.

gcc/ada/

* libgnat/system-vxworks7-x86_64-kernel.ads: Set
Support_Atomic_Primitives to false.
* libgnat/system-vxworks7-x86_64-rtp-smp.ads: Ditto.

2 years ago[Ada] Disable Support_Atomic_Primitives on QNX and VxWorks targets
Patrick Bernardi [Tue, 23 Aug 2022 14:36:06 +0000 (10:36 -0400)]
[Ada] Disable Support_Atomic_Primitives on QNX and VxWorks targets

The current configuration of the QNX and VxWorks runtimes does not support
atomic primitives.

gcc/ada/

* libgnat/system-qnx-arm.ads: Set Support_Atomic_Primitives to
false.
* libgnat/system-vxworks7-aarch64.ads: Ditto.
* libgnat/system-vxworks7-aarch64-rtp-smp.ads: Ditto.
* libgnat/system-vxworks7-arm.ads: Ditto.
* libgnat/system-vxworks7-arm-rtp-smp.ads: Ditto.
* libgnat/system-vxworks7-x86-kernel.ads: Ditto.
* libgnat/system-vxworks7-x86-rtp-smp.ads: Ditto.

2 years ago[Ada] Parser and lexer cleanup
Bob Duff [Wed, 17 Aug 2022 16:50:42 +0000 (12:50 -0400)]
[Ada] Parser and lexer cleanup

This patch makes various minor cleanup changes to the parser.
No change in behavior.

gcc/ada/

* par-tchk.adb, par-util.adb, prep.adb, prepcomp.adb, scng.adb:
Use "in" instead of chains of "=" connected with "or else".
Likewise for "not in", "/=", "and then". Misc cleanup.
* par-ch10.adb, par-ch12.adb, par-ch13.adb, par-ch4.adb: Likewise.
* par-ch8.adb, par-ch9.adb, par-endh.adb, par-sync.adb: Likewise.
* par.adb
(Pf_Rec): Remove filler, which was added August 25, 1993 to get
around a compiler limitation that no longer exists. Minor cleanup.
Remove useless qualfications.
* par-ch3.adb: Remove redundant return statements.
(Component_Scan_Loop): Remove loop name; there are no nested
loops, so it's unnecessary and possibly misleading, and it causes
too-long lines.
* par-ch5.adb: DRY: Remove comments that repeat the comments in
par.adb.
(P_Sequence_Of_Statements): It is better to initialize things on
the declaration. And constants are better than variables.
(Test_Statement_Required): Remove unnecessary insertion of a null
statement.
* par-ch6.adb, par-ch7.adb: DRY: Remove comments that repeat the
comments in par.adb.

2 years ago[Ada] Revert "Enforce matching of extra formals"
Javier Miranda [Tue, 23 Aug 2022 11:28:43 +0000 (11:28 +0000)]
[Ada] Revert "Enforce matching of extra formals"

This reverts commit 51abc0cc8691daecd7cec8372e4988e9f3f1913c.

2 years agoChangeLog: fix PR entry
Martin Liska [Mon, 12 Sep 2022 07:52:31 +0000 (09:52 +0200)]
ChangeLog: fix PR entry

gcc/testsuite/ChangeLog:

* ChangeLog: Fix PR reference.

2 years agoanalyzer: remove unused fields
Martin Liska [Mon, 12 Sep 2022 07:12:37 +0000 (09:12 +0200)]
analyzer: remove unused fields

Fixes:
gcc/analyzer/region-model.cc:5918:8: warning: private field 'm_record_type' is not used [-Wunused-private-field]
gcc/analyzer/region-model.cc:6305:25: warning: private field 'm_mgr' is not used [-Wunused-private-field]

gcc/analyzer/ChangeLog:

* region-model.cc (region_model::maybe_complain_about_infoleak):
  Remove unused fields.

2 years agoDaily bump.
GCC Administrator [Mon, 12 Sep 2022 00:17:04 +0000 (00:17 +0000)]
Daily bump.

2 years agoanalyzer: consider empty ranges and zero byte accesses [PR106845]
Tim Lange [Sat, 10 Sep 2022 21:53:48 +0000 (23:53 +0200)]
analyzer: consider empty ranges and zero byte accesses [PR106845]

This patch adds handling of empty ranges in bit_range and byte_range and
adds an assertion to member functions that assume a positive size.
Further, the patch fixes an ICE caused by an empty byte_range passed to
byte_range::exceeds_p.

Regression-tested on Linux x86_64.

2022-09-10  Tim Lange  <mail@tim-lange.me>

gcc/analyzer/ChangeLog:

PR analyzer/106845
* region-model.cc (region_model::check_region_bounds):
Bail out if 0 bytes were accessed.
* store.cc (byte_range::dump_to_pp):
Add special case for empty ranges.
(byte_range::exceeds_p): Restrict to non-empty ranges.
(byte_range::falls_short_of_p): Restrict to non-empty ranges.
* store.h (bit_range::empty_p): New function.
(bit_range::get_last_byte_offset): Restrict to non-empty ranges.
(byte_range::empty_p): New function.
(byte_range::get_last_byte_offset): Restrict to non-empty ranges.

gcc/testsuite/ChangeLog:

PR analyzer/106845
* gcc.dg/analyzer/out-of-bounds-zero.c: New test.
* gcc.dg/analyzer/pr106845.c: New test.

2 years agoDaily bump.
GCC Administrator [Sun, 11 Sep 2022 00:16:56 +0000 (00:16 +0000)]
Daily bump.

2 years agoxtensa: constantsynth: Add new 3-insns synthesis pattern
Takayuki 'January June' Suwa [Sat, 10 Sep 2022 09:29:45 +0000 (18:29 +0900)]
xtensa: constantsynth: Add new 3-insns synthesis pattern

This patch adds a new 3-instructions constant synthesis pattern:

- A value that can fit into a signed 12-bit after a number of either bitwise
  left or right rotations:
    => "MOVI(.N) Ax, simm12" + "SSAI (1 ... 11) or (21 ... 31)"
+ "SRC Ax, Ax, Ax"

gcc/ChangeLog:

* config/xtensa/xtensa.cc (xtensa_constantsynth):
Add new pattern for the abovementioned case.

gcc/testsuite/ChangeLog:

* gcc.target/xtensa/constsynth_3insns.c (test_4):
Add new test function.

2 years agors6000: Make an "if" statement more regular
Segher Boessenkool [Sat, 10 Sep 2022 15:13:40 +0000 (15:13 +0000)]
rs6000: Make an "if" statement more regular

As Akari noticed, we have an unusual "if" statement without parentheses
around the condition.  The condition is a macro that expands to
something with parentheses in the right spot, but, let's make the code a
little less surprising :-)

2022-09-10  Akari Takahashi  <akaritakahashioss@gmail.com>
    Segher Boessenkool  <segher@kernel.crashing.org>

* config/rs6000/rs6000.cc (get_memref_parts): Regularize some code.

2 years agolibgomp: Use libiberty environ.h to declare the environment pointer.
Iain Sandoe [Sat, 10 Sep 2022 07:54:37 +0000 (08:54 +0100)]
libgomp: Use libiberty environ.h to declare the environment pointer.

This allows for target-specific mechanisms for finding the pointer.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
libgomp/ChangeLog:

* env.c (initialize_env): Include libiberty environ.h.

2 years agofortran: Add IEEE_SIGNBIT and IEEE_FMA functions
Francois-Xavier Coudert [Wed, 31 Aug 2022 13:22:50 +0000 (15:22 +0200)]
fortran: Add IEEE_SIGNBIT and IEEE_FMA functions

The functions are added to the IEEE_ARITHMETIC module, but
are entirely expanded in the front-end, using GCC built-ins.

2022-08-31  Francois-Xavier Coudert <fxcoudert@gcc.gnu.org>

PR fortran/95644

gcc/fortran/
* f95-lang.cc (gfc_init_builtin_functions): Declare FMA
built-ins.
* mathbuiltins.def: Declare FMA built-ins.
* trans-intrinsic.cc (conv_intrinsic_ieee_fma): New function.
(conv_intrinsic_ieee_signbit): New function.
(gfc_build_intrinsic_lib_fndecls): Add cases for FMA and
SIGNBIT.

gcc/testsuite/
* gfortran.dg/ieee/fma_1.f90: New test.
* gfortran.dg/ieee/signbit_1.f90: New test.

libgfortran/
* ieee/ieee_arithmetic.F90: Add IEEE_SIGNBIT and IEEE_FMA.

2 years agoDaily bump.
GCC Administrator [Sat, 10 Sep 2022 00:17:21 +0000 (00:17 +0000)]
Daily bump.

2 years agoxtensa: Make complex hard register clobber elimination more robust and accurate
Takayuki 'January June' Suwa [Thu, 1 Sep 2022 05:49:13 +0000 (14:49 +0900)]
xtensa: Make complex hard register clobber elimination more robust and accurate

This patch eliminates all clobbers for complex hard registers that will
be overwritten entirely afterwards (supersedence of
3867d414bd7d9e5b6fb2a51b1fb3d9e9e1eae9).

gcc/ChangeLog:

* config/xtensa/xtensa.md: Rewrite the split pattern that performs
the abovementioned process so that insns that overwrite clobbered
register no longer need to be contiguous.
(DSC): Remove as no longer needed.

2 years agoxtensa: Eliminate unused stack frame allocation/freeing
Takayuki 'January June' Suwa [Thu, 8 Sep 2022 21:16:31 +0000 (06:16 +0900)]
xtensa: Eliminate unused stack frame allocation/freeing

In the example below, 'x' is once placed on the stack frame and then read
into registers as the argument value of bar():

    /* example */
    struct foo {
      int a, b;
    };
    extern struct foo bar(struct foo);
    struct foo test(void) {
      struct foo x = { 0, 1 };
      return bar(x);
    }

Thanks to the dead store elimination, the initialization of 'x' turns into
merely loading the immediates to registers, but corresponding stack frame
growth is not rolled back.  As a result:

    ;; prereq: the CALL0 ABI
    ;; before
    test:
addi sp, sp, -16 // unused stack frame allocation/freeing
movi.n a2, 0
movi.n a3, 1
addi sp, sp, 16 // because no instructions that refer to
j.l bar, a9 // the stack pointer between the two

This patch eliminates such unused stack frame allocation/freeing:

    ;; after
    test:
movi.n a2, 0
movi.n a3, 1
j.l bar, a9

gcc/ChangeLog:

* config/xtensa/xtensa.cc (machine_function): New boolean member as
a flag that controls whether to emit the insns for stack pointer
adjustment inside of the pro/epilogue.
(xtensa_emit_adjust_stack_ptr): New function to share the common
codes and to emit insns if not inhibited.
(xtensa_expand_epilogue): Change to use the function mentioned
above when using the CALL0 ABI.
(xtensa_expand_prologue): Ditto.
And also change to set the inhibit flag used by
xtensa_emit_adjust_stack_ptr() to true if the stack pointer is only
used for its own adjustment.

2 years agoanalyzer: implement trust boundaries via a plugin for Linux kernel
David Malcolm [Fri, 9 Sep 2022 21:13:04 +0000 (17:13 -0400)]
analyzer: implement trust boundaries via a plugin for Linux kernel

This is a less ambitious version of:
  [PATCH 0/6] RFC: adding support to GCC for detecting trust boundaries
    https://gcc.gnu.org/pipermail/gcc-patches/2021-November/584372.html

Earlier versions of this patch attempted:
(a) various ways of identifying "untrusted" memory regions
(b) providing a way to support the Linux kernel's "__user" annotation,
    either via type attributes, or via custom address spaces
(c) enough attributes to identify "copy_from_user" and "copy_to_user",
(d) wiring all of the above together to detect infoleaks and taint

This patch adds a new -Wanalyzer-exposure-through-uninit-copy, emitted
by -fanalyzer if it detects copying of uninitialized data through
a pointer to an untrusted region, but requires a plugin to tell it when
a copy crosses a trust boundary.

This patch adds a proof-of-concept gcc plugin for the analyzer for use
with the Linux kernel that special-cases calls to "copy_from_user" and
calls to "copy_to_user": calls to copy_to_user are checked for
-Wanalyzer-exposure-through-uninit-copy, and data copied via
copy_from_user is marked as tainted when -fanalyzer-checker=taint is
active.

This is very much just a proof-of-concept.  A big limitation is that the
copy_{from,to}_user special-casing only happens if these functions have
no body in the TU being analyzed, which isn't the case for a normal
kernel build.  I'd much prefer to provide a more general mechanism for
handling such behavior without resorting to plugins (e.g. via attributes
or custom address spaces), but in the interest of not "letting perfect
be the enemy of the good" this patch at least allows parts of this
"trust boundaries" code to be merged for experimentation with the idea.

The -Wanalyzer-exposure-through-uninit-copy diagnostic uses notes to
express what fields and padding within a struct have not been initialized.
For example:

infoleak-CVE-2011-1078-2.c: In function 'test_1':
infoleak-CVE-2011-1078-2.c:32:9: warning: potential exposure of sensitive
  information by copying uninitialized data from stack across trust
  boundary [CWE-200] [-Wanalyzer-exposure-through-uninit-copy]
   32 |         copy_to_user(optval, &cinfo, sizeof(cinfo));
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  'test_1': events 1-3
    |
    |   25 |         struct sco_conninfo cinfo;
    |      |                             ^~~~~
    |      |                             |
    |      |                             (1) region created on stack here
    |      |                             (2) capacity: 6 bytes
    |......
    |   32 |         copy_to_user(optval, &cinfo, sizeof(cinfo));
    |      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    |      |         |
    |      |         (3) uninitialized data copied from stack here
    |
infoleak-CVE-2011-1078-2.c:32:9: note: 1 byte is uninitialized
   32 |         copy_to_user(optval, &cinfo, sizeof(cinfo));
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
infoleak-CVE-2011-1078-2.c:18:15: note: padding after field 'dev_class'
  is uninitialized (1 byte)
   18 |         __u8  dev_class[3];
      |               ^~~~~~~~~
infoleak-CVE-2011-1078-2.c:25:29: note: suggest forcing
  zero-initialization by providing a '{0}' initializer
   25 |         struct sco_conninfo cinfo;
      |                             ^~~~~
      |                                   = {0}

For taint-detection, the patch includes a series of reproducers for
detecting CVE-2011-0521.  Unfortunately the analyzer doesn't yet detect
the issue until the code has been significantly simplified from its
original form: currently only in -5.c and -6.c in the series of test
(see notes in the individual cases), such as:

taint-CVE-2011-0521-6.c:33:48: warning: use of attacker-controlled value
  '*info.num' in array lookup without bounds checking [CWE-129]
  [-Wanalyzer-tainted-array-index]
   33 |             av7110->ci_slot[info->num].num = info->num;
      |             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
  'test_1': events 1-3
    |
    |   19 |    if (copy_from_user(&sbuf, (void __user *)arg, sizeof(sbuf)) != 0)
    |      |        ^
    |      |        |
    |      |        (1) following 'false' branch...
    |......
    |   23 |             struct dvb_device *dvbdev = file->private_data;
    |      |                                ~~~~~~
    |      |                                |
    |      |                                (2) ...to here
    |......
    |   33 |             av7110->ci_slot[info->num].num = info->num;
    |      |             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    |      |                                            |
    |      |                                            (3) use of attacker-controlled value '*info.num' in array lookup without bounds checking
    |

The patch also includes various infoleak and taint cases from my
antipatterns.ko kernel module:
  https://github.com/davidmalcolm/antipatterns.ko

gcc/analyzer/ChangeLog:
* analyzer.opt (Wanalyzer-exposure-through-uninit-copy): New.
* checker-path.cc (region_creation_event::region_creation_event):
Add "capacity" and "kind" params.
(region_creation_event::get_desc): Generalize to different kinds
of event.
(checker_path::add_region_creation_event): Convert to...
(checker_path::add_region_creation_events): ...this.
* checker-path.h (enum rce_kind): New.
(region_creation_event::region_creation_event): Add "capacity" and
"kind" params.
(region_creation_event::m_capacity): New field.
(region_creation_event::m_rce_kind): New field.
(checker_path::add_region_creation_event): Convert to...
(checker_path::add_region_creation_events): ...this.
* diagnostic-manager.cc (diagnostic_manager::build_emission_path):
Update for multiple region creation events.
(diagnostic_manager::add_event_on_final_node): Likewise.
(diagnostic_manager::add_events_for_eedge): Likewise.
* region-model-impl-calls.cc (call_details::get_logger): New.
* region-model.cc: Define INCLUDE_MEMORY before including
"system.h".  Include "gcc-rich-location.h".
(class record_layout): New.
(class exposure_through_uninit_copy): New.
(contains_uninit_p): New.
(region_model::maybe_complain_about_infoleak): New.
* region-model.h (call_details::get_logger): New decl.
(region_model::maybe_complain_about_infoleak): New decl.
(region_model::mark_as_tainted): New decl.
* sm-taint.cc (region_model::mark_as_tainted): New.

gcc/ChangeLog:
* doc/invoke.texi (Static Analyzer Options): Add
-Wanalyzer-exposure-through-uninit-copy.

gcc/testsuite/ChangeLog:
* gcc.dg/plugin/analyzer_kernel_plugin.c: New test.
* gcc.dg/plugin/copy_from_user-1.c: New test.
* gcc.dg/plugin/infoleak-1.c: New test.
* gcc.dg/plugin/infoleak-2.c: New test.
* gcc.dg/plugin/infoleak-3.c: New test.
* gcc.dg/plugin/infoleak-CVE-2011-1078-1.c: New test.
* gcc.dg/plugin/infoleak-CVE-2011-1078-2.c: New test.
* gcc.dg/plugin/infoleak-CVE-2014-1446-1.c: New test.
* gcc.dg/plugin/infoleak-CVE-2017-18549-1.c: New test.
* gcc.dg/plugin/infoleak-CVE-2017-18550-1.c: New test.
* gcc.dg/plugin/infoleak-antipatterns-1.c: New test.
* gcc.dg/plugin/infoleak-fixit-1.c: New test.
* gcc.dg/plugin/infoleak-net-ethtool-ioctl.c: New test.
* gcc.dg/plugin/infoleak-vfio_iommu_type1.c: New test.
* gcc.dg/plugin/plugin.exp (plugin_test_list): Add
analyzer_kernel_plugin.c and the new test cases.
* gcc.dg/plugin/taint-CVE-2011-0521-1-fixed.c: New test.
* gcc.dg/plugin/taint-CVE-2011-0521-1.c: New test.
* gcc.dg/plugin/taint-CVE-2011-0521-2-fixed.c: New test.
* gcc.dg/plugin/taint-CVE-2011-0521-2.c: New test.
* gcc.dg/plugin/taint-CVE-2011-0521-3-fixed.c: New test.
* gcc.dg/plugin/taint-CVE-2011-0521-3.c: New test.
* gcc.dg/plugin/taint-CVE-2011-0521-4.c: New test.
* gcc.dg/plugin/taint-CVE-2011-0521-5-fixed.c: New test.
* gcc.dg/plugin/taint-CVE-2011-0521-5.c: New test.
* gcc.dg/plugin/taint-CVE-2011-0521-6.c: New test.
* gcc.dg/plugin/taint-CVE-2011-0521.h: New test.
* gcc.dg/plugin/taint-antipatterns-1.c: New test.
* gcc.dg/plugin/test-uaccess.h: New header for tests.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>
2 years agoanalyzer: add support for plugin-supplied known function behaviors
David Malcolm [Fri, 9 Sep 2022 21:11:42 +0000 (17:11 -0400)]
analyzer: add support for plugin-supplied known function behaviors

This patch adds the ability for plugins to register "known functions"
with the analyzer, identified by name.  If -fanalyzer sees a call to
such a function (with no body), it will use a plugin-provided subclass
of the new known_function abstract base class to model the possible
outcomes of the function call.

gcc/ChangeLog:
* Makefile.in (ANALYZER_OBJS): Add
analyzer/known-function-manager.o.

gcc/analyzer/ChangeLog:
* analyzer.h (class known_function_manager): New forward decl.
(class known_function): New.
(plugin_analyzer_init_iface::register_known_function): New.
* engine.cc: Include "analyzer/known-function-manager.h".
(plugin_analyzer_init_impl::plugin_analyzer_init_impl): Add
known_fn_mgr param.
(plugin_analyzer_init_impl::register_state_machine): Add
LOC_SCOPE.
(plugin_analyzer_init_impl::register_known_function): New.
(plugin_analyzer_init_impl::m_known_fn_mgr): New.
(impl_run_checkers): Update plugin callback invocation to use
eng's known_function_manager.
* known-function-manager.cc: New file.
* known-function-manager.h: New file.
* region-model-manager.cc
(region_model_manager::region_model_manager): Pass logger to
m_known_fn_mgr's ctor.
* region-model.cc (region_model::update_for_zero_return): New.
(region_model::update_for_nonzero_return): New.
(maybe_simplify_upper_bound): New.
(region_model::maybe_get_copy_bounds): New.
(region_model::get_known_function): New.
(region_model::on_call_pre): Handle plugin-supplied known
functions.
* region-model.h: Include "analyzer/known-function-manager.h".
(region_model_manager::get_known_function_manager): New.
(region_model_manager::m_known_fn_mgr): New.
(call_details::get_model): New accessor.
(region_model::maybe_get_copy_bounds): New decl.
(region_model::update_for_zero_return): New decl.
(region_model::update_for_nonzero_return): New decl.
(region_model::get_known_function): New decl.
(region_model::get_known_function_manager): New.

gcc/testsuite/ChangeLog:
* gcc.dg/plugin/analyzer_known_fns_plugin.c: New test plugin.
* gcc.dg/plugin/known-fns-1.c: New test.
* gcc.dg/plugin/plugin.exp (plugin_test_list): Add the new plugin
and test.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>
2 years agoanalyzer: add test coverage for flexible array members [PR98247]
David Malcolm [Fri, 9 Sep 2022 21:10:08 +0000 (17:10 -0400)]
analyzer: add test coverage for flexible array members [PR98247]

gcc/testsuite/ChangeLog:
PR analyzer/98247
* gcc.dg/analyzer/flexible-array-member-1.c: New test.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>
2 years agolibstdc++: Rename parameter to avoid darwin __weak qualifier
Jonathan Wakely [Fri, 9 Sep 2022 20:03:58 +0000 (21:03 +0100)]
libstdc++: Rename parameter to avoid darwin __weak qualifier

libstdc++-v3/ChangeLog:

* include/bits/atomic_base.h (__atomic_impl::__compare_exchange):
Rename __weak to __is_weak.
* testsuite/17_intro/names.cc: Add __weak and __strong.

2 years agolibstdc++: Fix return type of empty zip_/adjacent_transform [PR106803]
Patrick Palka [Fri, 9 Sep 2022 18:59:14 +0000 (14:59 -0400)]
libstdc++: Fix return type of empty zip_/adjacent_transform [PR106803]

PR libstdc++/106803

libstdc++-v3/ChangeLog:

* include/std/ranges (views::_ZipTransform::operator()): Correct
return type in the empty case.
(views::_AdjacentTransform::operator()): Likewise.

2 years agolibstdc++: Fix typo in adjacent_view::_Iterator [PR106798]
Patrick Palka [Fri, 9 Sep 2022 18:56:37 +0000 (14:56 -0400)]
libstdc++: Fix typo in adjacent_view::_Iterator [PR106798]

PR libstdc++/106798

libstdc++-v3/ChangeLog:

* include/std/ranges (adjacent_view::_Iterator::_Iterator): Fix
typo.
* testsuite/std/ranges/adaptors/adjacent/1.cc (test04): New test.

2 years agolibstdc++: Fix zip_view's operator- for integer-class difference type [PR106766]
Patrick Palka [Fri, 9 Sep 2022 18:56:32 +0000 (14:56 -0400)]
libstdc++: Fix zip_view's operator- for integer-class difference type [PR106766]

The difference type of an underlying iterator could be an integer-class
type, which make_unsigned_t doesn't handle, so we need to use the more
general __make_unsigned_like_t / __to_unsigned_like here instead.

PR libstdc++/106766

libstdc++-v3/ChangeLog:

* include/std/ranges (zip_view::_Iterator::operator-): Use
__to_unsigned_like instead of make_unsigned_t.
(zip_view::_Sentinel::operator-): Likewise.
* testsuite/std/ranges/zip/1.cc (test04): New test.

2 years agonvptx: libgomp+mkoffload.cc: Prepare for reverse offload fn lookup
Tobias Burnus [Fri, 9 Sep 2022 15:58:02 +0000 (17:58 +0200)]
nvptx: libgomp+mkoffload.cc: Prepare for reverse offload fn lookup

Add support to nvptx for reverse lookup of function name to prepare for
'omp target device(ancestor:1)'.

gcc/ChangeLog:

* config/nvptx/mkoffload.cc (struct id_map): Add 'dim' member.
(record_id): Store func name without quotes, store dim separately.
(process): For GOMP_REQUIRES_REVERSE_OFFLOAD, check that -march is
at least sm_35, create '$offload_func_table' global array and init
with reverse-offload function addresses.
* config/nvptx/nvptx.cc (write_fn_proto_1, write_fn_proto): New
force_public attribute to force .visible.
(nvptx_declare_function_name): For "omp target
device_ancestor_nohost" attribut, force .visible/TREE_PUBLIC.

libgomp/ChangeLog:

* plugin/plugin-nvptx.c (GOMP_OFFLOAD_load_image): Read offload
function address table '$offload_func_table' if rev_fn_table
is not NULL.

2 years agoGCN: libgomp+mkoffload.cc: Prepare for reverse offload fn lookup
Tobias Burnus [Fri, 9 Sep 2022 15:43:12 +0000 (17:43 +0200)]
GCN: libgomp+mkoffload.cc: Prepare for reverse offload fn lookup

Add support to GCN for reverse lookup of function name to prepare for
'omp target device(ancestor:1)'.

gcc/ChangeLog:

* config/gcn/mkoffload.cc (process_asm): Create .offload_func_table,
similar to pre-existing .offload_var_table.

libgomp/ChangeLog:

* plugin/plugin-gcn.c (GOMP_OFFLOAD_load_image): Read
.offload_func_table to populate rev_fn_table when requested.

2 years agolibgomp: Prepare for reverse offload fn lookup
Tobias Burnus [Fri, 9 Sep 2022 15:37:09 +0000 (17:37 +0200)]
libgomp: Prepare for reverse offload fn lookup

Prepare for reverse-offloading function-pointer lookup by passing
a rev_fn_table argument to GOMP_OFFLOAD_load_image.

The argument will be NULL, unless GOMP_REQUIRES_REVERSE_OFFLOAD is
requested and devices not supported it, are filtered out.
(Up to and including this commit, no non-host device claims such
support and the caller currently always passes NULL.)

libgomp/ChangeLog:

* libgomp-plugin.h (GOMP_OFFLOAD_load_image): Add
'uint64_t **rev_fn_table' argument.
* oacc-host.c (host_load_image): Likewise.
* plugin/plugin-gcn.c (GOMP_OFFLOAD_load_image): Likewise;
currently unused.
* plugin/plugin-nvptx.c (GOMP_OFFLOAD_load_image): Likewise.
* target.c (gomp_load_image_to_device): Update call but pass
NULL for now.

liboffloadmic/ChangeLog:

* plugin/libgomp-plugin-intelmic.cpp (GOMP_OFFLOAD_load_image):
Add (unused) uint64_t **rev_fn_table argument.

2 years agostddef.h: Add C2x unreachable macro
Joseph Myers [Fri, 9 Sep 2022 14:11:21 +0000 (14:11 +0000)]
stddef.h: Add C2x unreachable macro

C2x adds a macro unreachable to stddef.h, with the same semantics as
__builtin_unreachable.  Define this macro accordingly.

Bootstrapped with no regressions for x86_64-pc-linux-gnu.

gcc/
* ginclude/stddef.h [__STDC_VERSION__ > 201710L] (unreachable):
New macro.

gcc/testsuite/
* gcc.dg/c11-unreachable-1.c, gcc.dg/c2x-unreachable-1.c: New
tests.

2 years agoHandle OPAQUE_TYPE specially in verify_type [PR106833]
Kewen Lin [Fri, 9 Sep 2022 13:17:21 +0000 (08:17 -0500)]
Handle OPAQUE_TYPE specially in verify_type [PR106833]

As PR106833 shows, cv-qualified opaque type can cause ICE
during LTO.  It exposes that we missd to handle OPAQUE_TYPE
well in type verification.  As Richi pointed out, also
assuming that target will always define TYPE_MAIN_VARIANT
TYPE_CANONICAL for opaque type, this patch is to check
both are OPAQUE_TYPE_P and their modes are of MODE_OPAQUE
class.  Besides, it also checks the only available size
and alignment information.

PR middle-end/106833

gcc/ChangeLog:

* tree.cc (verify_opaque_type): New function.
(verify_type): Call verify_opaque_type for OPAQUE_TYPE.

gcc/testsuite/ChangeLog:

* gcc.target/powerpc/pr106833.c: New test.

2 years agoamdgcn: Add support for additional natively supported floating-point operations
Kwok Cheung Yeung [Fri, 9 Sep 2022 13:10:07 +0000 (13:10 +0000)]
amdgcn: Add support for additional natively supported floating-point operations

This adds support for the following natively supported floating-point
operations, in scalar and vectorized modes:

floor, ceil, exp2*, log2*, sin*, cos*, ldexp, frexp

* These operations are single-precision float only and are only active
if unsafe_math_optimizations are enabled (due to potential numerical
precision issues).

2022-09-09  Kwok Cheung Yeung  <kcy@codesourcery.com>

gcc/
* config/gcn/gcn-builtins.def (FABSVF, LDEXPVF, LDEXPV, FREXPVF_EXP,
FREXPVF_MANT, FREXPV_EXP, FREXPV_MANT): Add new builtins.
* config/gcn/gcn-protos.h (gcn_dconst1over2pi): New prototype.
* config/gcn/gcn-valu.md (MATH_UNOP_1OR2REG, MATH_UNOP_1REG,
MATH_UNOP_TRIG): New iterators.
(math_unop): New attributes.
(<math_unop><mode>2, <math_unop><mode>2<exec>,
<math_unop><mode>2, <math_unop><mode>2<exec>,
*<math_unop><mode>2_insn, *<math_unop><mode>2<exec>_insn,
ldexp<mode>3, ldexp<mode>3<exec>,
frexp<mode>_exp2, frexp<mode>_mant2,
frexp<mode>_exp2<exec>, frexp<mode>_mant2<exec>): New instructions.
(<math_unop><mode>2, <math_unop><mode>2<exec>): New expanders.
* config/gcn/gcn.cc (init_ext_gcn_constants): Update definition of
dconst1over2pi.
(gcn_dconst1over2pi): New.
(gcn_builtin_type_index): Add entry for v64df type.
(v64df_type_node): New.
(gcn_init_builtin_types): Initialize v64df_type_node.
(gcn_expand_builtin_1): Expand new builtins to instructions.
(print_operand): Fix assembler output for 1/(2*PI) constant.
* config/gcn/gcn.md (unspec): Add new entries.

2 years agotree-optimization/106722 - avoid invalid pointer association in predcom
Richard Biener [Fri, 9 Sep 2022 10:06:38 +0000 (12:06 +0200)]
tree-optimization/106722 - avoid invalid pointer association in predcom

When predictive commoning builds a reference for iteration N it
prematurely associates a constant offset into the MEM_REF offset
operand which can be invalid if the base pointer then points
outside of an object which alias-analysis does not consider valid.

PR tree-optimization/106722
* tree-predcom.cc (ref_at_iteration): Do not associate the
constant part of the offset into the MEM_REF offset
operand, across a non-zero offset.

* gcc.dg/torture/pr106892.c: New testcase.

2 years agolibgomp: Fix up OMP_PROC_BIND handling [PR106894]
Jakub Jelinek [Fri, 9 Sep 2022 11:43:43 +0000 (13:43 +0200)]
libgomp: Fix up OMP_PROC_BIND handling [PR106894]

While the first param is char (gomp_global_icv.bind_var), the second param
is char * (gomp_bind_var_list), so we shouldn't access it through *(char *).

2022-09-09  Jakub Jelinek  <jakub@redhat.com>

PR libgomp/106894
* env.c (initialize_env) <case PARSE_BIND>: Use char ** instead of
char * for dest[1] initialization from params[1].  Formatting fixes.

2 years agoRISC-V: Suppress build warnings
Kito Cheng [Fri, 9 Sep 2022 08:39:08 +0000 (16:39 +0800)]
RISC-V: Suppress build warnings

../../gcc/common/config/riscv/riscv-common.cc: In function 'const char* riscv_multi_lib_check(int, const char**)':
../../gcc/common/config/riscv/riscv-common.cc:1451:11: error: bare apostrophe ''' in format [-Werror=format-diag]
 1451 |       "Can't find suitable multilib set for %<-march=%s%>/%<-mabi=%s%>",
      |           ^
../../gcc/common/config/riscv/riscv-common.cc:1451:7: note: if avoiding the apostrophe is not feasible, enclose it in a pair of '%<' and '%>' directives instead
 1451 |       "Can't find suitable multilib set for %<-march=%s%>/%<-mabi=%s%>",
      |       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../gcc/common/config/riscv/riscv-common.cc: At global scope:
../../gcc/common/config/riscv/riscv-common.cc:1492:1: error: 'int riscv_check_conds(const switchstr*, int, int, const std::vector<std::__cxx11::basic_string<char> >&)' defined but not used [-Werror=unused-function]
 1492 | riscv_check_conds (
      | ^~~~~~~~~~~~~~~~~
../../gcc/common/config/riscv/riscv-common.cc:1374:1: error: 'const char* find_last_appear_switch(const switchstr*, int, const char*)' defined but not used [-Werror=unused-function]
 1374 | find_last_appear_switch (
      | ^~~~~~~~~~~~~~~~~~~~~~~
cc1plus: all warnings being treated as errors
make[3]: *** [Makefile:2442: riscv-common.o] Error 1

gcc/ChangeLog:

* common/config/riscv/riscv-common.cc (RISCV_USE_CUSTOMISED_MULTI_LIB):
Move forward for cover all all necessary functions for suppress
unused function warnings.
(riscv_multi_lib_check): Move forward, and tweak message to suppress
-Werror=format-diag warning.

2 years agotree-optimization/106881 - fix simple_control_dep_chain part
Richard Biener [Fri, 9 Sep 2022 07:56:45 +0000 (09:56 +0200)]
tree-optimization/106881 - fix simple_control_dep_chain part

This adjusts simple_control_dep_chain in the same way I adjusted
compute_control_dep_chain_pdom to avoid adding fallthru edges to
the predicate chain.

PR tree-optimization/106881
* gimple-predicate-analysis.cc (simple_control_dep_chain):
Add only non-fallthru edges and avoid the same set of edges
as compute_control_dep_chain_pdom does.

2 years agoFix "address will never be NULL" warning
Jan-Benedict Glaw [Fri, 9 Sep 2022 08:27:27 +0000 (10:27 +0200)]
Fix "address will never be NULL" warning

The mingw32 port is the only port to have TARGET_OVERRIDES_FORMAT_ATTRIBUTES
defined. When this macro is defined, it will never evaluate to NULL and produce
a warning: "error: the address of 'mingw_format_attribute_overrides' will never
be NULL [-Werror=address]"

  Also, when TARGET_OVERRIDES_FORMAT_ATTRIBUTES is defined,
TARGET_OVERRIDES_FORMAT_ATTRIBUTES_COUNT must be defined as well. Add that
requirement to the docs.

2022-09-07  Jan-Benedict Glaw  <jbglaw@lug-owl.de>

gcc/c-family/ChangeLog:
* c-format.cc (convert_format_name_to_system_name): Fix warning.
gcc/ChangeLog:
* doc/tm.texi.in (TARGET_OVERRIDES_FORMAT_ATTRIBUTES): Document requirement
of TARGET_OVERRIDES_FORMAT_ATTRIBUTES_COUNT being defined as well.
* doc/tm.texi: Regenerate.

2 years agoopts: always compare array option values with memcmp
Martin Liska [Thu, 8 Sep 2022 18:00:33 +0000 (20:00 +0200)]
opts: always compare array option values with memcmp

gcc/ChangeLog:

* optc-save-gen.awk: Always compare array option values with memcmp.

2 years agoDaily bump.
GCC Administrator [Fri, 9 Sep 2022 00:18:05 +0000 (00:18 +0000)]
Daily bump.

2 years agolibstdc++: mallinfo deprecated, use mallinfo2 when glibc => 2.33
François Dumont [Thu, 8 Sep 2022 04:55:20 +0000 (06:55 +0200)]
libstdc++: mallinfo deprecated, use mallinfo2 when glibc => 2.33

glibc mallinfo is now deprecated resulting in make check-performance
failure. When glibc => 2.33 prefer mallinfo2.

libstdc++-v3/ChangeLog:

* testsuite/util/testsuite_performance.h (__gnu_test::MallocInfo): New.
(__gnu_test::malloc_info): New, replace mallinfo on current platform
supporting it and use mallinfo2 when glibc >= 2.33.

2 years agoOpenMP: Document ompx warnings + add Fortran omx warning [PR106670]
Tobias Burnus [Thu, 8 Sep 2022 19:03:21 +0000 (21:03 +0200)]
OpenMP: Document ompx warnings + add Fortran omx warning [PR106670]

omp/ompx sentinels are for vendor extensions; as they might be required for
the correctness of the program, a warning should be printable. This patch
documents in the OpenMP 5.2 table the existing warnings, including the new
warning for for fixed source form Fortran.

PR fortran/106670

gcc/fortran/ChangeLog:

* scanner.cc (skip_fixed_omp_sentinel): Add -Wsurprising warning
for 'omx' sentinels with -fopenmp.
* invoke.texi (-Wsurprising): Document additional warning case.

libgomp/ChangeLog:

* libgomp.texi (OpenMP 5.2): Add comment to ompx/omx entry.

gcc/testsuite/ChangeLog:

* c-c++-common/gomp/ompx-1.c: New test.
* c-c++-common/gomp/ompx-2.c: New test.
* g++.dg/gomp/ompx-attrs-1.C: New test.
* gfortran.dg/gomp/ompx-1.f90: New test.
* gfortran.dg/gomp/omx-1.f: New test.
* gfortran.dg/gomp/omx-2.f: New test.

2 years agolibgomp.texi: Document libmemkind + nvptx/gcn specifics
Tobias Burnus [Thu, 8 Sep 2022 18:56:49 +0000 (20:56 +0200)]
libgomp.texi: Document libmemkind + nvptx/gcn specifics

libgomp/ChangeLog:

* libgomp.texi (OpenMP-Implementation Specifics): New; add libmemkind
section; move OpenMP Context Selectors from ...
(Offload-Target Specifics): ... here; add 'AMD Radeo (GCN)' and
'nvptx' sections.

2 years agoc++: Fix type completeness checks for type traits [PR106838]
Jonathan Wakely [Tue, 6 Sep 2022 12:21:09 +0000 (13:21 +0100)]
c++: Fix type completeness checks for type traits [PR106838]

The check_trait_type function is used for a number of different type
traits that have different requirements on their arguments. For example,
__is_constructible allows arrays of unknown bound even if the array
element is an incomplete type, but __is_aggregate does not, it always
requires the array element type to be complete. Other traits have
different requirements again, e.g. __is_empty allows incomplete unions,
and arrays (of known or unknown bound) of incomplete types.

This alters the check_trait_type function to take an additional KIND
parameter which indicates which set of type trait requirements to check.

As noted in a comment, the requirements for __is_aggregate deviate from
the ones for std::is_aggregate in the standard. It's not necessary for
the elements of an array to be complete types, because arrays are always
aggregates.

The type_has_virtual_destructor change is needed to avoid an ICE.
Previously it could never be called for incomplete union types as they
were (incorrectly) rejected by check_trait_type.

This change causes some additional diagnostics in some libstdc++ tests,
where the front end was not previously complaining about invalid types
that the library assertions diagnosed. We should consider removing the
library assertions from traits where the front end implements the
correct checks now.

PR c++/106838

gcc/cp/ChangeLog:

* class.cc (type_has_virtual_destructor): Return false for
union types.
* semantics.cc (check_trait_type): Add KIND parameter to support
different sets of requirements.
(finish_trait_expr): Pass KIND argument for relevant traits.

gcc/ChangeLog:

* doc/extend.texi (Type Traits): Fix requirements. Document
__is_aggregate and __is_final.

gcc/testsuite/ChangeLog:

* g++.dg/ext/array4.C: Fix invalid use of __is_constructible.
* g++.dg/ext/unary_trait_incomplete.C: Fix tests for traits with
different requirements.

libstdc++-v3/ChangeLog:

* testsuite/20_util/is_complete_or_unbounded/memoization_neg.cc:
Prune additional errors from front-end.
* testsuite/20_util/is_move_constructible/incomplete_neg.cc:
Likewise.
* testsuite/20_util/is_nothrow_swappable/incomplete_neg.cc:
Likewise.
* testsuite/20_util/is_nothrow_swappable_with/incomplete_neg.cc:
Likewise.
* testsuite/20_util/is_swappable_with/incomplete_neg.cc:
Likewise.

2 years agolibstdc++: Add always_inline attribute to std::byte operators
Jonathan Wakely [Thu, 8 Sep 2022 12:46:02 +0000 (13:46 +0100)]
libstdc++: Add always_inline attribute to std::byte operators

libstdc++-v3/ChangeLog:

* include/c_global/cstddef (byte): Add always_inline attribute
to all operator overloads.
(to_integer): Add always_inline attribute.

2 years agolibstdc++: Clear padding bits in atomic compare_exchange
Thomas Rodgers [Thu, 25 Aug 2022 10:11:40 +0000 (12:11 +0200)]
libstdc++: Clear padding bits in atomic compare_exchange

This change implements P0528 which requires that padding bits not
participate in atomic compare exchange operations. All arguments to the
generic template are 'sanitized' by the __builtin_clear_padding intrinsic
before they are used in comparisons. This requires that any stores
also sanitize the incoming value.

Co-authored-by: Jakub Jelinek <jakub@redhat.com>
Co-authored-by: Jonathan Wakely <jwakely@redhat.com>
Signed-off-by: Thomas Rodgers <trodgers@redhat.com>
libstdc++-v3/ChangeLog:

* include/bits/atomic_base.h (__atomic_impl::__maybe_has_padding):
New function.
(__atomic_impl::clear_padding): Likewise.
(__atomic_impl::__compare_exchange): Likewise.
(__atomic_impl::compare_exchange_weak): Delegate to
__compare_exchange.
(__atomic_impl::compare_exchange_strong): Likewise.
* include/std/atomic (atomic<T>::atomic(T)): Clear padding when
possible in a constexpr function.
(atomic::store): Clear padding.
(atomic::exchange): Likewise.
(atomic::compare_exchange_weak): Use __compare_exchange.
(atomic::compare_exchange_strong): Likewise.
* testsuite/29_atomics/atomic/compare_exchange_padding.cc: New
test.
* testsuite/29_atomics/atomic_ref/compare_exchange_padding.cc:
New test.

2 years agolibstdc++: Find make_error_code and make_error_condition via ADL only
Jonathan Wakely [Wed, 7 Sep 2022 19:17:04 +0000 (20:17 +0100)]
libstdc++: Find make_error_code and make_error_condition via ADL only

The new proposed resolution for LWG 3629 says that std::error_code and
std::error_condition should only use ADL to find their customization
points. This means we need to use a poison pill to prevent lookup from
finding overloads in the enclosing namespaces.

We can also remove the forward declarations of std::make_error_code and
std::make_error_condition, because they aren't needed now. ADL can find
them anyway (when std is an associated namespace), and unqualified name
lookup will not (and should not) find them.

libstdc++-v3/ChangeLog:

* include/std/system_error (__adl_only::make_error_code): Add
deleted function.
(__adl_only::make_error_condition): Likewise.
(error_code::error_code(ErrorCodeEnum)): Add using-declaration
for deleted function.
(error_condition::error_condition(ErrorConditionEnum)):
Likewise.
* testsuite/19_diagnostics/error_code/cons/lwg3629.cc: New test.
* testsuite/19_diagnostics/error_condition/cons/lwg3629.cc: New test.

2 years agoanalyzer: support for symbolic values in the out-of-bounds checker [PR106625]
Tim Lange [Wed, 7 Sep 2022 15:41:28 +0000 (17:41 +0200)]
analyzer: support for symbolic values in the out-of-bounds checker [PR106625]

This patch adds support for reasoning about the inequality of two symbolic
values in the special case specifically suited for reasoning about
out-of-bounds past the end of the buffer. With this patch, the analyzer
catches off-by-one errors and more even when the offset and capacity is
symbolic.

Regrtested on Linux x86_64 and tested on coreutils, curl, httpd and
openssh as usual.

2022-09-07  Tim Lange  <mail@tim-lange.me>

gcc/analyzer/ChangeLog:

PR analyzer/106625
* analyzer.h (region_offset): Eliminate m_is_symbolic member.
* region-model-impl-calls.cc (region_model::impl_call_realloc):
Refine implementation to be more precise.
* region-model.cc (class symbolic_past_the_end):
Abstract diagnostic class to complain about accesses past the end
with symbolic values.
(class symbolic_buffer_overflow):
Concrete diagnostic class to complain about buffer overflows with
symbolic values.
(class symbolic_buffer_overread):
Concrete diagnostic class to complain about buffer overreads with
symbolic values.
(region_model::check_symbolic_bounds): New function.
(maybe_get_integer_cst_tree): New helper function.
(region_model::check_region_bounds):
Add call to check_symbolic_bounds if offset is not concrete.
(region_model::eval_condition_without_cm):
Add support for EQ_EXPR and GT_EXPR with binaryop_svalues.
(is_positive_svalue): New hleper function.
(region_model::symbolic_greater_than):
New function to handle GT_EXPR comparisons with symbolic values.
(region_model::structural_equality): New function to compare
whether two svalues are structured the same, i.e. evaluate to
the same value.
(test_struct): Reflect changes to region::calc_offset.
(test_var): Likewise.
(test_array_2): Likewise and add selftest with symbolic i.
* region-model.h (class region_model): Add check_symbolic_bounds,
symbolic_greater_than and structural_equality.
* region.cc (region::get_offset):
Reflect changes to region::calc_offset.
(region::calc_offset):
Compute the symbolic offset if the offset is not concrete.
(region::get_relative_symbolic_offset): New function to return the
symbolic offset in bytes relative to its parent.
(field_region::get_relative_symbolic_offset): Likewise.
(element_region::get_relative_symbolic_offset): Likewise.
(offset_region::get_relative_symbolic_offset): Likewise.
(bit_range_region::get_relative_symbolic_offset): Likewise.
* region.h: Add get_relative_symbolic_offset.
* store.cc (binding_key::make):
Reflect changes to region::calc_offset.
(binding_map::apply_ctor_val_to_range): Likewise.
(binding_map::apply_ctor_pair_to_child_region): Likewise.
(binding_cluster::bind_compound_sval): Likewise.
(binding_cluster::get_any_binding): Likewise.
(binding_cluster::maybe_get_compound_binding): Likewise.

gcc/ChangeLog:

PR analyzer/106625
* doc/invoke.texi:
State that the checker also reasons about symbolic values.

gcc/testsuite/ChangeLog:

PR analyzer/106625
* gcc.dg/analyzer/data-model-1.c: Change expected result.
* gcc.dg/analyzer/out-of-bounds-5.c: New test.
* gcc.dg/analyzer/out-of-bounds-realloc-grow.c: New test.
* gcc.dg/analyzer/symbolic-gt-1.c: New test.

2 years agoOpenMP, libgomp: Environment variable syntax extension
Marcel Vollweiler [Thu, 8 Sep 2022 17:01:33 +0000 (10:01 -0700)]
OpenMP, libgomp: Environment variable syntax extension

This patch considers the environment variable syntax extension for
device-specific variants of environment variables from OpenMP 5.1 (see
OpenMP 5.1 specification, p. 75 and p. 639).  An environment variable (e.g.
OMP_NUM_TEAMS) can have different suffixes:

_DEV (e.g. OMP_NUM_TEAMS_DEV): affects all devices but not the host.
_DEV_<device> (e.g. OMP_NUM_TEAMS_DEV_42): affects only device with
number <device>.
no suffix (e.g. OMP_NUM_TEAMS): affects only the host.

In future OpenMP versions also suffix _ALL will be introduced (see discussion
https://github.com/OpenMP/spec/issues/3179). This is also considered in this
patch:

_ALL (e.g. OMP_NUM_TEAMS_ALL): affects all devices and the host.

The precedence is as follows (descending). For the host:

1. no suffix
2. _ALL

For devices:

1. _DEV_<device>
2. _DEV
3. _ALL

That means, _DEV_<device> is used whenever available. Otherwise _DEV is used if
available, and at last _ALL.  If there is no value for any of the variable
variants, default values are used as already implemented before.

This patch concerns parsing (a), storing (b), output (c) and transmission to the
device (d):

(a) The actual number of devices and the numbering are not known when parsing
the environment variables.  Thus all environment variables are iterated and
searched for device-specific ones.
(b) Only configured device-specific variables are stored.  Thus, a linked list
is used.
(c) The output is done in omp_display_env (see specification p. 468f).  Global
ICVs are tagged with [all], see https://github.com/OpenMP/spec/issues/3179.
ICVs which are not global but aren't handled device-specific yet are tagged
with [host].  omp_display_env outputs the initial values of the ICVs.  That is
why a dedicated data structure is introduced for the inital values only
(gomp_initial_icv_list).
(d) Device-specific ICVs are transmitted to the device via GOMP_ADDITIONAL_ICVS.

libgomp/ChangeLog:

* config/gcn/icv-device.c (omp_get_default_device): Return device-
specific ICV.
(omp_get_max_teams): Added for GCN devices.
(omp_set_num_teams): Likewise.
(ialias): Likewise.
* config/nvptx/icv-device.c (omp_get_default_device): Return device-
specific ICV.
(omp_get_max_teams): Added for NVPTX devices.
(omp_set_num_teams): Likewise.
(ialias): Likewise.
* env.c (struct gomp_icv_list): New struct to store entries of initial
ICV values.
(struct gomp_offload_icv_list): New struct to store entries of device-
specific ICV values that are copied to the device and back.
(struct gomp_default_icv_values): New struct to store default values of
ICVs according to the OpenMP standard.
(parse_schedule): Generalized for different variants of OMP_SCHEDULE.
(print_env_var_error): Function that prints an error for invalid values
for ICVs.
(parse_unsigned_long_1): Removed getenv.  Generalized.
(parse_unsigned_long): Likewise.
(parse_int_1): Likewise.
(parse_int): Likewise.
(parse_int_secure): Likewise.
(parse_unsigned_long_list): Likewise.
(parse_target_offload): Likewise.
(parse_bind_var): Likewise.
(parse_stacksize): Likewise.
(parse_boolean): Likewise.
(parse_wait_policy): Likewise.
(parse_allocator): Likewise.
(omp_display_env): Extended to output different variants of environment
variables.
(print_schedule): New helper function for omp_display_env which prints
the values of run_sched_var.
(print_proc_bind): New helper function for omp_display_env which prints
the values of proc_bind_var.
(enum gomp_parse_type): Collection of types used for parsing environment
variables.
(ENTRY): Preprocess string lengths of environment variables.
(OMP_VAR_CNT): Preprocess table size.
(OMP_HOST_VAR_CNT): Likewise.
(INT_MAX_STR_LEN): Constant for the maximal number of digits of a device
number.
(gomp_get_icv_flag): Returns if a flag for a particular ICV is set.
(gomp_set_icv_flag): Sets a flag for a particular ICV.
(print_device_specific_icvs): New helper function for omp_display_env to
print device specific ICV values.
(get_device_num): New helper function for parse_device_specific.
Extracts the device number from an environment variable name.
(get_icv_member_addr): Gets the memory address for a particular member
of an ICV struct.
(gomp_get_initial_icv_item): Get a list item of gomp_initial_icv_list.
(initialize_icvs): New function to initialize a gomp_initial_icvs
struct.
(add_initial_icv_to_list): Adds an ICV struct to gomp_initial_icv_list.
(startswith): Checks if a string starts with a given prefix.
(initialize_env): Extended to parse the new syntax of environment
variables.
* icv-device.c (omp_get_max_teams): Added.
(ialias): Likewise.
(omp_set_num_teams): Likewise.
* icv.c (omp_set_num_teams): Moved to icv-device.c.
(omp_get_max_teams): Likewise.
(ialias): Likewise.
* libgomp-plugin.h (GOMP_DEVICE_NUM_VAR): Removed.
(GOMP_ADDITIONAL_ICVS): New target-side struct that
holds the designated ICVs of the target device.
* libgomp.h (enum gomp_icvs): Collection of ICVs.
(enum gomp_device_num): Definition of device numbers for _ALL, _DEV, and
no suffix.
(enum gomp_env_suffix): Collection of possible suffixes of environment
variables.
(struct gomp_initial_icvs): Contains all ICVs for which we need to store
initial values.
(struct gomp_default_icv):New struct to hold ICVs for which we need
to store initial values.
(struct gomp_icv_list): Definition of a linked list that is used for
storing ICVs for the devices and also for _DEV, _ALL, and without
suffix.
(struct gomp_offload_icvs): New struct to hold ICVs that are copied to
a device.
(struct gomp_offload_icv_list): Definition of a linked list that holds
device-specific ICVs that are copied to devices.
(gomp_get_initial_icv_item): Get a list item of gomp_initial_icv_list.
(gomp_get_icv_flag): Returns if a flag for a particular ICV is set.
* libgomp.texi: Updated.
* plugin/plugin-gcn.c (GOMP_OFFLOAD_load_image): Extended to read
further ICVs from the offload image.
* plugin/plugin-nvptx.c (GOMP_OFFLOAD_load_image): Likewise.
* target.c (gomp_get_offload_icv_item): Get a list item of
gomp_offload_icv_list.
(get_gomp_offload_icvs): New. Returns the ICV values
depending on the device num and the variable hierarchy.
(gomp_load_image_to_device): Extended to copy further ICVs to a device.
* testsuite/libgomp.c-c++-common/icv-5.c: New test.
* testsuite/libgomp.c-c++-common/icv-6.c: New test.
* testsuite/libgomp.c-c++-common/icv-7.c: New test.
* testsuite/libgomp.c-c++-common/icv-8.c: New test.
* testsuite/libgomp.c-c++-common/omp-display-env-1.c: New test.
* testsuite/libgomp.c-c++-common/omp-display-env-2.c: New test.

2 years agovect: Fix scalar stmt typo in vect_optimize_slp_pass [PR106886]
Richard Sandiford [Thu, 8 Sep 2022 15:18:28 +0000 (16:18 +0100)]
vect: Fix scalar stmt typo in vect_optimize_slp_pass [PR106886]

Fix a stupid typo in my vect_optimize_slp_pass patch.

gcc/
PR tree-optimization/106886
* tree-vect-slp.cc (vect_optimize_slp_pass::get_result_with_layout):
Fix copying of scalar stmts.

gcc/testsuite/
PR tree-optimization/106886
* gcc.dg/vect/bb-slp-layout-21.c: New test.

2 years agonios2: Add #undef of MUSL_DYNAMIC_LINKER
Chung-Lin Tang [Thu, 8 Sep 2022 15:14:38 +0000 (23:14 +0800)]
nios2: Add #undef of MUSL_DYNAMIC_LINKER

Add #undef of MUSL_DYNAMIC_LINKER before #define, to satisfy build checks
when configured with --enable-werror-always.

gcc/ChangeLog:

* config/nios2/linux.h (MUSL_DYNAMIC_LINKER): Add #undef before #define.

2 years agoc++: Add testcase for already fixed PR [PR99209]
Patrick Palka [Thu, 8 Sep 2022 14:49:04 +0000 (10:49 -0400)]
c++: Add testcase for already fixed PR [PR99209]

This was incidentally fixed by r13-806-g221acd67ca50f8.

PR c++/99209

gcc/testsuite/ChangeLog:

* g++.dg/cpp2a/lambda-uneval17.C: New test.

2 years agoFix some gimple_ctrl_altering_p mistakes
Richard Biener [Wed, 7 Sep 2022 10:01:34 +0000 (12:01 +0200)]
Fix some gimple_ctrl_altering_p mistakes

CFG cleanup resets the control altering flag for noreturn functions
when they are ECF_LEAF (like __builtin_unreachable ()).  The
.ABNORMAL_DISPATCHER call built during CFG construction is not
marked as control altering.  Several passes inserting traps or
unreachables fail to set the flag.  And more.

PR middle-end/106870
* gimple-harden-conditionals.cc (insert_check_and_trap):
Set the control-altering flag on the built IFN_TRAP.
* gimple.cc (gimple_build_builtin_unreachable): Likewise.
* tree-cfg.cc (handle_abnormal_edges): Set the control-altering
flag on the .ABNORMAL_DISPATCHER call.
* tree-cfgcleanup.cc (cleanup_call_ctrl_altering_flag): Avoid
resetting the control altering flag for ECF_NORETURN calls.
(cleanup_control_flow_bb): Set the control altering flag on
discovered noreturn calls.
* symtab-thunks.cc (expand_thunk): Set the control altering
flag for the noreturn tailcall case.
* tree-eh.cc (lower_resx): Likewisw for trap and unwind_resume
calls.

2 years agoc++: unnecessary instantiation of constexpr var [PR99130]
Patrick Palka [Thu, 8 Sep 2022 13:45:45 +0000 (09:45 -0400)]
c++: unnecessary instantiation of constexpr var [PR99130]

Here the use of 'value' from within an unevaluated context causes us
to overeagerly instantiate it, via maybe_instantiate_decl called from
mark_used, despite the use occurring in a context that doesn't require
a definition.

This seems to only affect constexpr variable specializations, though
we used to have the same issue for constexpr function specializations
until r6-1309-g81371eff9bc7ef made us delay their instantiation until
necessary during constexpr evaluation.

This patch expands upon the r6-1309 fix to make mark_used avoid
unnecessarily instantiating constexpr variable specializations too,
by pulling out from maybe_instantiate_decl the condition

  (decl_maybe_constant_var_p (decl)
   || (TREE_CODE (decl) == FUNCTION_DECL
       && DECL_OMP_DECLARE_REDUCTION_P (decl))
   || undeduced_auto_decl (decl))

into each of its three callers (including mark_used), removing the
problematic first test from mark_used, and simplifying accordingly.
The net result is that only mark_used is changed because the other two
callers, resolve_address_of_overloaded_function and decl_constant_var_p,
already guard the call appropriately.  (This relaxation of mark_used
seems to be safe because during constexpr evaluation we already take
care to instantiate a constexpr variable as necessary via
decl_constant_value etc).

PR c++/99130

gcc/cp/ChangeLog:

* decl2.cc (maybe_instantiate_decl): Adjust function comment.
Check VAR_OR_FUNCTION_DECL_P.  Pull out the disjunction into ...
(mark_used): ... here, removing the decl_maybe_constant_var_p
part of it.

gcc/testsuite/ChangeLog:

* g++.dg/cpp0x/constexpr-decltype5.C: New test.

2 years agopch: Fix the reconstruction of adhoc data hash table
Lewis Hyatt [Wed, 7 Sep 2022 13:33:26 +0000 (09:33 -0400)]
pch: Fix the reconstruction of adhoc data hash table

The function rebuild_location_adhoc_htab() was meant to reconstruct the
adhoc location hash map after restoring a line_maps instance from a
PCH. However, the function has never performed as intended because it
missed the last step of adding the data into the newly reconstructed hash
map. This patch fixes that.

It does not seem possible to construct a test case such that the current
incorrect behavior is observable as a compiler issue. It would be
observable, if it were possible for a precompiled header to contain an
adhoc location with a non-zero custom data pointer. But currently, such
data pointers are used only by the middle end to track inlining
information, and this happens later, too late to show up in a PCH.

I also noted that location_adhoc_data_update, which updates the hash map
pointers in a different scenario, was relying on undefined pointer
arithmetic behavior. I'm not aware of this having caused any issue in
practice, but in this patch I have also changed it to use defined pointer
operations instead.

libcpp/ChangeLog:

* line-map.cc (location_adhoc_data_update): Remove reliance on
undefined behavior.
(get_combined_adhoc_loc): Likewise.
(rebuild_location_adhoc_htab): Fix issue where the htab was not
properly updated.

2 years agoopenmp: Implement doacross(sink: omp_cur_iteration - 1)
Jakub Jelinek [Thu, 8 Sep 2022 11:08:22 +0000 (13:08 +0200)]
openmp: Implement doacross(sink: omp_cur_iteration - 1)

This patch implements doacross(sink: omp_cur_iteration - 1) that the
previous patchset emitted a sorry on during omp expansion.
It can be implemented with existing library functions.

To recap, depend(source)/doacross(source:)/doacross(source:omp_cur_iteration)
is implemented calling GOMP_doacross_post or GOMP_doacross_ull_post,
called with an array of long or unsigned long long elements, one for
all collapsed loops together and one for each further ordered loop if any.
We initialize that array in each thread when grabbing further set of iterations
and update it at the end of loops, so that it represents the current iteration
(as 0 based counters).  When the worksharing loop is created, we tell the
library through another similar array the counts (the loop needs to be
rectangular) in each dimension, first element is count of all logical iterations
in the collapsed loops.

depend(sink:v1 op N1, v2 op N2, ...) is then implemented by conditionally calling
GOMP_doacross_wait/GOMP_doacross_ull_wait.  For N? of 0 there is no check,
otherwise if it wants to wait in a particular dimension for a previous iteration,
we check that the corresponding iterator isn't the first one (or first few),
where the previous iterator in that dimension would be out of range, and similarly
for checking of next iteration in a dimension that it isn't the last one (or last few)
where it would be similarly out of bounds.  Then the collapsed loop counters are
folded into a single 0 based counter (first argument) and then other 0 based
iterations counters on what iteration it should wait for.

Now, doacross(sink: omp_cur_iteration - 1) is supposed to wait for the previous
logical iteration in the combined iteration space of all ordered loops.
For the very first iteration in that combined iteration space it does nothing,
there is no previous iteration.  And similarly it does nothing if there
are more ordered loops than collapsed loop and it isn't the first logical
iteration of the combined loops inside of the collapsed loops, because as implemented
we know the previous iteration in that case is always executed by the same thread
as the current one.
In the implementation, we use the same value as is stored in the first element
of the array for GOMP_doacross_post/GOMP_doacross_ull_post, if that value is 0,
we do nothing.  The rest is different based on if ordered argument is equal to
collapse or not.  If it is, then we otherwise call
GOMP_doacross_wait/GOMP_doacross_ull_wait with a single argument, one less than
that counter we compare against 0.
If ordered argument is bigger than collapse, we add a per-thread boolean variable
.first.N, which we set to true at the start of the outermost ordered loop inside
of the collapsed set of loops and set to false at the end of the innermost
ordered loop.  If .first.N is false, we don't do anything (we know the previous
iteration was handled by the current thread and by my reading of the spec we don't
need to emit even a memory barrier in that case, because it is just synchronization
with the same thread), otherwise we call GOMP_doacross_wait/GOMP_doacross_ull_wait
with the first argument one less than the counter we compare against 0, and then
one less than 2nd and following counts if iterations we pass to the workshare
initialization.  If say .counts.N passed to the workshare initialization is
{ 256, 13, 5, 2 } for collapse(3) ordered(6) loop, then
GOMP_doacross_post/GOMP_doacross_ull_post is called with arguments equal to
.ordereda.N[0] - 1, 12, 4, 1.

2022-09-08  Jakub Jelinek  <jakub@redhat.com>

gcc/
* omp-expand.cc (expand_omp_ordered_sink): Add CONT_BB argument.
Add doacross(sink:omp_cur_iteration-1) support.
(expand_omp_ordered_source_sink): Clear counts[fd->ordered + 1].
Adjust expand_omp_ordered_sink caller.
(expand_omp_for_ordered_loops): If counts[fd->ordered + 1] is
non-NULL, set that variable to true at the start of outermost
non-collapsed loop and set it to false at the end of innermost
ordered loop.
(expand_omp_for_generic): If fd->ordered, allocate
1 + (fd->ordered - fd->collapse) further elements in counts array.
Copy to counts + 2 + fd->ordered the counts of fd->collapse ..
fd->ordered - 1 loop if any.
gcc/testsuite/
* c-c++-common/gomp/doacross-7.c: New test.
libgomp/
* libgomp.texi (OpenMP 5.2): Mention that omp_cur_iteration is now
fully supported.
* testsuite/libgomp.c/doacross-4.c: New test.
* testsuite/libgomp.c/doacross-5.c: New test.
* testsuite/libgomp.c/doacross-6.c: New test.
* testsuite/libgomp.c/doacross-7.c: New test.

2 years agotree-optimization/106881 - constrain uninit control edge add
Richard Biener [Thu, 8 Sep 2022 10:22:26 +0000 (12:22 +0200)]
tree-optimization/106881 - constrain uninit control edge add

The following avoids adding fallthru edges to the control chain from
the post-dominator walk.

PR tree-optimization/106881
* gimple-predicate-analysis.cc (compute_control_dep_chain_pdom):
Add only non-fallthru edges and avoid the same set of edges
as the caller does.

* gcc.dg/uninit-pr106881.c: New testcase.

2 years agotestsuite/106872 - fix uninit predicate dump scan
Richard Biener [Thu, 8 Sep 2022 11:00:45 +0000 (13:00 +0200)]
testsuite/106872 - fix uninit predicate dump scan

On ppc we see a doloop temp rather than ivtmp.

PR testsuite/106872
* gcc.dg/uninit-pred-12.c: Adjust.

2 years agoImplement known/maybe fpclassify like API for frange.
Aldy Hernandez [Thu, 8 Sep 2022 06:11:43 +0000 (08:11 +0200)]
Implement known/maybe fpclassify like API for frange.

gcc/ChangeLog:

* gimple-range-fold.cc
(fold_using_range::range_of_builtin_int_call): Use fpclassify like API.
* range-op-float.cc (finite_operand_p): Same.
(finite_operands_p): Same.
(foperator_lt::fold_range): Same.
(foperator_le::fold_range): Same.
(foperator_gt::fold_range): Same.
(foperator_ge::fold_range): Same.
(foperator_unordered::fold_range): Same.
(foperator_unordered::op1_range): Same.
(foperator_ordered::fold_range): Same.
* value-range.cc (frange::set_nan): Same.
(frange::set_signbit): Same.
(frange::union_): Same.
(frange::intersect): Same.
(frange::operator==): Same.
(frange::singleton_p): Same.
(frange::verify_range): Same.
(range_tests_nan): Same.
(range_tests_floats): Same.
* value-range.h(frange::known_finite): New.
(frange::maybe_inf): New.
(frange::known_inf): New.
(frange::maybe_nan): New.
(frange::known_nan): New.
(frange::known_signbit): New.

2 years agod: Include tm.h in all D target platform sources, remove memmodel.h
Iain Buclaw [Thu, 8 Sep 2022 10:29:32 +0000 (12:29 +0200)]
d: Include tm.h in all D target platform sources, remove memmodel.h

The tm.h header would pull in config/elfos.h, which defines
TARGET_D_MINFO_SECTION needed for the D module support in the front-end
to emit data to the correct section for the run-time library to pick up.

The removal of it in r13-2385 caused a stage2 bootstrap failure on all
Solaris targets.

The memmodel header has also been removed as it is no longer required
now tm_p.h is no longer used by these sources.

gcc/ChangeLog:

* config/darwin-d.cc: Include tm.h.
* config/dragonfly-d.cc: Likewise.
* config/freebsd-d.cc: Remove memmodel.h.
* config/glibc-d.cc: Likewise.
* config/netbsd-d.cc: Include tm.h.
* config/openbsd-d.cc: Likewise.
* config/sol2-d.cc: Likewise.

2 years agoarm: Fix constant immediates predicates and constraints for some MVE builtins
Christophe Lyon [Tue, 6 Sep 2022 16:08:36 +0000 (16:08 +0000)]
arm: Fix constant immediates predicates and constraints for some MVE builtins

Several MVE builtins incorrectly use the same predicate/constraint
pair for several modes, which does not match the specification.
This patch uses the appropriate iterator instead.

2022-09-06  Christophe Lyon  <christophe.lyon@arm.com>

gcc/
* config/arm/mve.md (mve_vqshluq_n_s<mode>): Use
MVE_pred/MVE_constraint instead of mve_imm_7/Ra.
(mve_vqshluq_m_n_s<mode>): Likewise.
(mve_vqrshrnbq_n_<supf><mode>): Use MVE_pred3/MVE_constraint3
instead of mve_imm_8/Rb.
(mve_vqrshrunbq_n_s<mode>): Likewise.
(mve_vqrshrntq_n_<supf><mode>): Likewise.
(mve_vqrshruntq_n_s<mode>): Likewise.
(mve_vrshrnbq_n_<supf><mode>): Likewise.
(mve_vrshrntq_n_<supf><mode>): Likewise.
(mve_vqrshrnbq_m_n_<supf><mode>): Likewise.
(mve_vqrshrntq_m_n_<supf><mode>): Likewise.
(mve_vrshrnbq_m_n_<supf><mode>): Likewise.
(mve_vrshrntq_m_n_<supf><mode>): Likewise.
(mve_vqrshrunbq_m_n_s<mode>): Likewise.
(mve_vsriq_n_<supf><mode): Use MVE_pred2/MVE_constraint2 instead
of mve_imm_selective_upto_8/Rg.
(mve_vsriq_m_n_<supf><mode>): Likewise.

2 years agors6000: allow constant splitter run in split1 pass
Jiufu Guo [Thu, 8 Sep 2022 05:55:53 +0000 (13:55 +0800)]
rs6000: allow constant splitter run in split1 pass

Currently, these two splitters (touched in this patch) are using predicate
`int_reg_operand_not_pseudo`, then they work in split2 pass after RA in
most times, and can not run before RA.

It would not be a bad idea to allow these splitters before RA.  Then more
passes (e.g. combine, sched...) could optimize the emitted instructions.

And if splitting before RA, for current constant splitter, we may have more
freedom to create pseduo to help to generate more parallel instructions.
For the example in the leading patch [PATCH 1/2]: pli+plit+rldimi would be
better than pli+sldi+paddi.

Test this patch with spec, we could see performance gain some times; while
the improvement is not stable and woud caused by the patch indirectly.

gcc/ChangeLog:

* config/rs6000/rs6000.md (splitter for set to and_mask constants):
Use int_reg_operand (instead of int_reg_operand_not_pseudo).
(splitter for multi-insn constant loads): Ditto.

2 years agoRTEMS: Add -mvrsave multilibs
Sebastian Huber [Thu, 1 Sep 2022 08:22:47 +0000 (10:22 +0200)]
RTEMS: Add -mvrsave multilibs

gcc/ChangeLog:

* config/rs6000/rtems.h (CPP_OS_DEFAULT_SPEC): Define __PPC_VRSAVE__ if
-mvrsave is present.
* config/rs6000/t-rtems: Add -mvrsave multilib variants for
-mcpu=e6500.

2 years agoDaily bump.
GCC Administrator [Thu, 8 Sep 2022 00:18:33 +0000 (00:18 +0000)]
Daily bump.

2 years agolibstdc++: Add missing runtime exception to licence notice
Jonathan Wakely [Tue, 6 Sep 2022 10:58:21 +0000 (11:58 +0100)]
libstdc++: Add missing runtime exception to licence notice

This file is missing the GCC Runtime Library Exception text in the
licence header. That is unintentional, and it should have been present.

libstdc++-v3/ChangeLog:

* include/std/barrier: Add missing runtime exception.

2 years agoRestore detection of HAVE_XCOFF_DWARF_EXTRAS
Martin Liska [Wed, 7 Sep 2022 14:33:59 +0000 (16:33 +0200)]
Restore detection of HAVE_XCOFF_DWARF_EXTRAS

gcc/ChangeLog:

* configure.ac: Restore detection of  HAVE_XCOFF_DWARF_EXTRAS.
* config/rs6000/rs6000.cc (HAVE_XCOFF_DWARF_EXTRAS): Reset it.
* configure: Regenerate.
* config.in: Regenerate.

2 years agoc++: diagnostic for template placeholder in parm [PR106793]
Jason Merrill [Fri, 2 Sep 2022 12:45:02 +0000 (08:45 -0400)]
c++: diagnostic for template placeholder in parm [PR106793]

Talking about the declarator form doesn't help when fixing that would get
you a different error about placeholders not being valid in a parameter.

This also adds a <> fixit, which isn't enough for most templates, but is a
start.

PR c++/106793

gcc/cp/ChangeLog:

* decl.cc (grokdeclarator): Improve placeholder diagnostics.
* parser.cc (cp_parser_type_id_1): Add fixit.

gcc/testsuite/ChangeLog:

* g++.dg/cpp23/auto-array2.C: Adjust.
* g++.dg/cpp1z/class-deduction113.C: New test.

2 years agoUpdate my email address
Jeff Law [Wed, 7 Sep 2022 16:32:31 +0000 (12:32 -0400)]
Update my email address

/
* MAINTAINERS: Update my email address.

2 years agosched1: Fix -fcompare-debug issue in schedule_region [PR105586]
Surya Kumari Jangala [Wed, 3 Aug 2022 04:00:03 +0000 (23:00 -0500)]
sched1: Fix -fcompare-debug issue in schedule_region [PR105586]

In schedule_region(), a basic block that does not contain any real insns
is not scheduled and the dfa state at the entry of the bb is not copied
to the fallthru basic block. However a DEBUG insn is treated as a real
insn, and if a bb contains non-real insns and a DEBUG insn, it's dfa
state is copied to the fallthru bb. This was resulting in
-fcompare-debug failure as the incoming dfa state of the fallthru block
is different with -g. We should always copy the dfa state of a bb to
it's fallthru bb even if the bb does not contain real insns.

2022-08-22  Surya Kumari Jangala  <jskumari@linux.ibm.com>

gcc/
PR rtl-optimization/105586
* sched-rgn.cc (save_state_for_fallthru_edge): New function.
(schedule_region): Use it for all blocks.

gcc/testsuite/
PR rtl-optimization/105586
* gcc.target/powerpc/pr105586.c: New test.

2 years agoc++: top level bind when rewriting coroutines [PR106188]
Arsen Arsenović [Sun, 4 Sep 2022 19:04:23 +0000 (21:04 +0200)]
c++: top level bind when rewriting coroutines [PR106188]

In the edge case of a coroutine not containing any locals, the ifcd/switch
temporaries would get added to the coroutine frame, corrupting its
layout. To prevent this, we can make sure there is always a BIND_EXPR at
the top of the function body, and thus, always a place for our new
temporaries to go without interfering with the coroutine frame.

PR c++/106188 - Incorrect frame layout after transforming conditional statement without top-level bind expression
PR c++/106713 - if (co_await ...) crashes with a jump to ud2

PR c++/106188
PR c++/106713

gcc/cp/ChangeLog:

* coroutines.cc (coro_rewrite_function_body): Ensure we have a
BIND_EXPR wrapping the function body.

gcc/testsuite/ChangeLog:

* g++.dg/coroutines/pr106188.C: New test.

Signed-off-by: Arsen Arsenović <arsen@aarsen.me>
2 years agolibstdc++: Optimize is_reference
Patrick Palka [Wed, 7 Sep 2022 14:21:51 +0000 (10:21 -0400)]
libstdc++: Optimize is_reference

Instead of defining is_reference in terms of is_[lr]value_reference,
just define it directly.

libstdc++-v3/ChangeLog:

* include/std/type_traits (is_reference): Make the primary
template derive from false_type.  Define two partial
specializations that derive from true_type.

2 years agolibstdc++: Optimize is_void and is_null_pointer
Patrick Palka [Wed, 7 Sep 2022 14:21:45 +0000 (10:21 -0400)]
libstdc++: Optimize is_void and is_null_pointer

Instead of defining these in terms of a helper class template
and the relatively expensive __remove_cv_t, just declare four
explicit specializations of the main template, one for each choice
of cv-quals.

libstdc++-v3/ChangeLog:

* include/std/type_traits (__is_void_helper): Remove.
(is_void): Make the primary template derive from false_type,
and define four explicit specializations that derive from
true_type.
(__is_null_pointer_helper, is_null_pointer): Likewise.

2 years agolibstdc++: small dynamic_cast optimization
Jason Merrill [Tue, 6 Sep 2022 14:35:21 +0000 (10:35 -0400)]
libstdc++: small dynamic_cast optimization

This change speeds up the simple benchmark below by about 40%.

struct A { virtual ~A() {} };
struct B: A { } b;
A* ap = &b;
void *sink;
int main()
{
  for (long i = 0; i < 4000000000L; ++i)
    sink = dynamic_cast<B*>(ap);
}

libstdc++-v3/ChangeLog:

* libsupc++/dyncast.cc (__dynamic_cast): Avoid virtual function
call in simple success case.

2 years agoc: New C2x keywords
Joseph Myers [Wed, 7 Sep 2022 13:56:25 +0000 (13:56 +0000)]
c: New C2x keywords

C2x follows C++ in making alignas, alignof, bool, false,
static_assert, thread_local and true keywords; implement this
accordingly.  This implementation makes them normal keywords in C2x
mode just like any other keyword (C2x leaves open the possibility of
implementation using predefined macros instead - thus, there aren't
any testcases asserting that they aren't macros).  As in C++ and
previous versions of C, true and false are handled like signed 1 and 0
in #if (there was an intermediate state in some C2x drafts where they
had different macro expansions that were unsigned in #if).

Bootstrapped with no regressions for x86_64-pc-linux-gnu.

As with the removal of unprototyped functions, this change has a high
risk of breaking some old code and people doing GNU/Linux distribution
builds may wish to see how much is broken in a build with a -std=gnu2x
default.

gcc/
* ginclude/stdalign.h [defined __STDC_VERSION__ &&
__STDC_VERSION__ > 201710L]: Disable all content.
* ginclude/stdbool.h [defined __STDC_VERSION__ && __STDC_VERSION__
> 201710L] (bool, true, false): Do not define.

gcc/c-family/
* c-common.cc (c_common_reswords): Use D_C2X instead of D_CXXONLY
for alignas, alignof, bool, false, static_assert, thread_local and
true.

gcc/c/
* c-parser.cc (c_parser_static_assert_declaration_no_semi)
(c_parser_alignas_specifier, c_parser_alignof_expression): Allow
for C2x spellings of keywords.
(c_parser_postfix_expression): Handle RID_TRUE and RID_FALSE.

gcc/testsuite/
* gcc.dg/c11-keywords-1.c, gcc.dg/c2x-align-1.c,
gcc.dg/c2x-align-6.c, gcc.dg/c2x-bool-2.c,
gcc.dg/c2x-static-assert-3.c, gcc.dg/c2x-static-assert-4.c,
gcc.dg/c2x-thread-local-1.c: New tests.
* gcc.dg/c2x-bool-1.c: Update expectations.

libcpp/
* include/cpplib.h (struct cpp_options): Add true_false.
* expr.cc (eval_token): Check true_false not cplusplus to
determine whether to handle true and false keywords.
* init.cc (struct lang_flags): Add true_false.
(lang_defaults): Update.
(cpp_set_lang): Set true_false.

2 years agoRestore XCOFF for DWARF on AIX.
Martin Liska [Wed, 7 Sep 2022 09:47:40 +0000 (11:47 +0200)]
Restore XCOFF for DWARF on AIX.

PR bootstrap/106855

gcc/ChangeLog:

* collect2.cc (scan_prog_file): Restore if XCOFF_DEBUGGING_INFO.
* config/rs6000/rs6000.cc (rs6000_option_override_internal):
  Restore usage of XCOFF_DEBUGGING_INFO.
* config/rs6000/xcoff.h (XCOFF_DEBUGGING_INFO): Restore.
* dwarf2asm.cc (XCOFF_DEBUGGING_INFO): Restore support for
  XCOFF_DEBUGGING_INFO.
(dw2_asm_output_nstring): Likewise.
(USE_LINKONCE_INDIRECT): Likewise.
* dwarf2out.cc (XCOFF_DEBUGGING_INFO): Likewise.
(HAVE_XCOFF_DWARF_EXTRAS): Likewise.
(output_fde): Likewise.
(output_call_frame_info): Likewise.
(have_macinfo): Likewise.
(add_AT_loc_list): Likewise.
(add_AT_view_list): Likewise.
(output_compilation_unit_header): Likewise.
(output_pubnames): Likewise.
(output_aranges): Likewise.
(output_line_info): Likewise.
(output_macinfo): Likewise.
(dwarf2out_finish): Likewise.
(dwarf2out_early_finish): Likewise.

2 years agotree-optimization/106866 - avoid dead abnormal edges from DCE
Richard Biener [Wed, 7 Sep 2022 10:50:40 +0000 (12:50 +0200)]
tree-optimization/106866 - avoid dead abnormal edges from DCE

When DCE clears cfun->calls_setjmp then suddenly we don't need
any abnormal call edges anymore.  The following makes sure to
prune them which otherwise can confuse other passes.

PR tree-optimization/106866
* tree-ssa-dce.cc (eliminate_unnecessary_stmts): When
we changed cfun->calls_setjmp make sure to purge all
abnormal call edges.

* gcc.dg/uninit-pr106866.c: New testcase.

2 years ago[gdb/build] Fix build breaker with --enable-shared
Tom de Vries [Wed, 7 Sep 2022 11:19:05 +0000 (13:19 +0200)]
[gdb/build] Fix build breaker with --enable-shared

When building gdb with --enable-shared, I run into:
...
ld: build/zlib/libz.a(libz_a-inffast.o): relocation R_X86_64_32S against \
  `.rodata' can not be used when making a shared object; recompile with -fPIC
ld: build/zlib/libz.a(libz_a-inflate.o): warning: relocation against \
  `inflateResetKeep' in read-only section `.text'
collect2: error: ld returned 1 exit status
make[3]: *** [libbfd.la] Error 1
...

This is a regression since commit a08bdb159bb ("[gdb/build] Fix gdbserver
build with -fsanitize=thread").

The problem is that a single case statement in configure is shared to handle
special requirements for both the host libiberty and host zlib, which has the
effect that only one is handled.

Fix this by handling libiberty and zlib each in its own case statement.

Build on x86_64-linux, with and without --enable-shared.

ChangeLog:

2022-09-07  Tom de Vries  <tdevries@suse.de>

* configure.ac: Set extra_host_libiberty_configure_flags and
extra_host_zlib_configure_flags in separate case statements.
* configure: Regenerate.

2 years ago[PR106867] Add test for PR.
Aldy Hernandez [Wed, 7 Sep 2022 10:58:49 +0000 (12:58 +0200)]
[PR106867] Add test for PR.

PR tree-optimization/106867

gcc/testsuite/ChangeLog:

* gcc.dg/tree-ssa/pr106867.c: New test.

2 years agoC-SKY: Fix expanding of float LE comparing with zero for fpuv3.
Xianmiao Qu [Wed, 7 Sep 2022 09:19:54 +0000 (17:19 +0800)]
C-SKY: Fix expanding of float LE comparing with zero for fpuv3.

The original code will cause the warning:
/usr/lib/gcc-snapshot/bin/g++  -fno-PIE -c   -g -O2   -DIN_GCC  -DCROSS_DIRECTORY_STRUCTURE   -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wmissing-format-attribute -Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror -fno-common  -DHAVE_CONFIG_H -I. -I. -I../../gcc/gcc -I../../gcc/gcc/. -I../../gcc/gcc/../include -I../../gcc/gcc/../libcpp/include -I../../gcc/gcc/../libcody  -I../../gcc/gcc/../libdecnumber -I../../gcc/gcc/../libdecnumber/dpd -I../libdecnumber -I../../gcc/gcc/../libbacktrace   -o csky.o -MT csky.o -MMD -MP -MF ./.deps/csky.TPo ../../gcc/gcc/config/csky/csky.cc
In file included from ../../gcc/gcc/config/csky/csky.h:183,
                from ./tm.h:20,
                from ../../gcc/gcc/backend.h:28,
                from ../../gcc/gcc/config/csky/csky.cc:27:
../../gcc/gcc/config/csky/csky.cc: In function 'bool csky_emit_compare_float(rtx_code, rtx, rtx)':
../../gcc/gcc/config/csky/csky_isa.h:29:37: error: enum constant in boolean context [-Werror=int-in-bool-context]
  29 | #define CSKY_ISA_FEATURE_DEFINE(x)  isa_bit_ ## x
      |                                     ^~~~~~~~
../../gcc/gcc/config/csky/csky_isa.h:30:37: note: in expansion of macro 'CSKY_ISA_FEATURE_DEFINE'
  30 | #define CSKY_ISA_FEATURE_GET(x)     CSKY_ISA_FEATURE_DEFINE (x)
      |                                     ^~~~~~~~~~~~~~~~~~~~~~~
../../gcc/gcc/config/csky/csky.cc:6346:43: note: in expansion of macro 'CSKY_ISA_FEATURE_GET'
6346 |                                        || CSKY_ISA_FEATURE_GET(fpv2_df)
      |                                           ^~~~~~~~~~~~~~~~~~~~
../../gcc/gcc/config/csky/csky_isa.h:29:37: error: enum constant in boolean context [-Werror=int-in-bool-context]
  29 | #define CSKY_ISA_FEATURE_DEFINE(x)  isa_bit_ ## x
      |                                     ^~~~~~~~
../../gcc/gcc/config/csky/csky_isa.h:30:37: note: in expansion of macro 'CSKY_ISA_FEATURE_DEFINE'
  30 | #define CSKY_ISA_FEATURE_GET(x)     CSKY_ISA_FEATURE_DEFINE (x)
      |                                     ^~~~~~~~~~~~~~~~~~~~~~~
../../gcc/gcc/config/csky/csky.cc:6346:43: note: in expansion of macro 'CSKY_ISA_FEATURE_GET'
6346 |                                        || CSKY_ISA_FEATURE_GET(fpv2_df)
      |                                           ^~~~~~~~~~~~~~~~~~~~
../../gcc/gcc/config/csky/csky_isa.h:29:37: error: enum constant in boolean context [-Werror=int-in-bool-context]
  29 | #define CSKY_ISA_FEATURE_DEFINE(x)  isa_bit_ ## x
      |                                     ^~~~~~~~
../../gcc/gcc/config/csky/csky_isa.h:30:37: note: in expansion of macro 'CSKY_ISA_FEATURE_DEFINE'
  30 | #define CSKY_ISA_FEATURE_GET(x)     CSKY_ISA_FEATURE_DEFINE (x)
      |                                     ^~~~~~~~~~~~~~~~~~~~~~~
../../gcc/gcc/config/csky/csky.cc:6347:43: note: in expansion of macro 'CSKY_ISA_FEATURE_GET'
6347 |                                        || CSKY_ISA_FEATURE_GET(fpv2_divd)))
      |                                           ^~~~~~~~~~~~~~~~~~~~

The 'CSKY_ISA_FEATURE_DEFINE (x)' is an enum contant, it will cause the condition always being true.
In addition to warning, it will let FPUV3 to generate a move instruction, which is unnecessary.
In a simple test case, the move instruction can be combined, so it was not found in the testsuite.
But in some complex scenarios, this may generate some redundant instructions.
The correct way is to use 'CSKY_ISA_FEATURE' instead of 'CSKY_ISA_FEATURE_DEFINE'.

gcc/
* config/csky/csky.cc (csky_emit_compare_float): Fix the expanding of
float LE comparing with zero for fpuv3.
* config/csky/csky.h (TARGET_SUPPORT_FPV2): New, true if any fpuv2
features are enabled.

2 years agotree-optimization/106860 - fix profile scaling in split_loop
Richard Biener [Wed, 7 Sep 2022 08:44:33 +0000 (10:44 +0200)]
tree-optimization/106860 - fix profile scaling in split_loop

The following fixes a mistake in loop splitting which assumes loop
latches have a single predecessor and that edge is from the exit
test.  Instead work from the single exit edge we have to find the
edge towards the latch.

PR tree-optimization/106860
* tree-ssa-loop-split.cc (split_loop): Find the exit to
latch edge from the loop exit edge instead of from the
latch.  Verify we're going to find it.

* g++.dg/opt/pr106860.C: New testcase.

2 years agomark region also for USE predicate discovery
Richard Biener [Tue, 6 Sep 2022 13:30:53 +0000 (15:30 +0200)]
mark region also for USE predicate discovery

The following makes sure to mark the dominating region also for
USE predicate discovery, avoiding compute_control_dep_chain to
walk to unrelated areas, eating up walking budget.

* gimple-predicate-analysis.cc (dfs_mark_dominating_region):
Adjust to take the region exit source as argument.
(uninit_analysis::init_from_phi_def): Adjust.
(uninit_analysis::init_use_preds): Mark the dominating region
before computing control dependences.

2 years agoaarch64: Fix +nosimd handling of FPR moves
Richard Sandiford [Wed, 7 Sep 2022 09:52:04 +0000 (10:52 +0100)]
aarch64: Fix +nosimd handling of FPR moves

8-bit and 16-bit FPR moves would ICE for +nosimd+fp, and some other
moves would handle FPR<-zero inefficiently.  This is very much a
niche case at the moment, but something like it becomes more
important with SME streaming mode.

The si, di and vector tests already passed, they're just included for
completeness.

We're a bit inconsistent about whether alternatives involving FPRs
are marked with arch==fp or arch=* (i.e. default).  E.g. FPR loads
and stores are sometimes * and sometimes fp.

IMO * makes more sense.  FPRs should not be used at all without
TARGET_FLOAT, so TARGET_FLOAT represents the base architecture
when FPRs are enabled.  I think it's more useful if non-default
arches represent a genuine restriction.

gcc/
* config/aarch64/aarch64.md (*mov<SHORT:mode>_aarch64): Extend
w<-w, r<-w and w<-r alternatives to !simd, using 32-bit moves
in that case.  Extend w<-r to w<-Z.
(*mov<HFBF:mode>_aarch64): Likewise, but with Y instead of Z.
(*movti_aarch64): Use an FMOV from XZR for w<-Z if MOVI is not
available.
(define_split): Do not apply the floating-point immediate-to-register
split to zeros, even if MOVI is not available.

gcc/testsuite/
* gcc.target/aarch64/movqi_1.c: New test.
* gcc.target/aarch64/movhi_1.c: Likewise.
* gcc.target/aarch64/movsi_1.c: Likewise.
* gcc.target/aarch64/movdi_2.c: Likewise.
* gcc.target/aarch64/movti_2.c: Likewise.
* gcc.target/aarch64/movhf_1.c: Likewise.
* gcc.target/aarch64/movsf_1.c: Likewise.
* gcc.target/aarch64/movdf_1.c: Likewise.
* gcc.target/aarch64/movtf_2.c: Likewise.
* gcc.target/aarch64/movv8qi_1.c: Likewise.
* gcc.target/aarch64/movv16qi_1.c: Likewise.

2 years agoaarch64: Prevent FPR register asms for +nofp
Richard Sandiford [Wed, 7 Sep 2022 09:52:03 +0000 (10:52 +0100)]
aarch64: Prevent FPR register asms for +nofp

+nofp disabled the automatic allocation of FPRs, but it didn't stop
users from explicitly putting register variables in FPRs.  We'd then
either report an ICE or generate unsupported instructions.

It's still possible (and deliberately redundant) to specify FPRs in
clobber lists.

gcc/
* config/aarch64/aarch64.cc (aarch64_conditional_register_usage):
Disallow use of FPRs in register asms for !TARGET_FLOAT.

gcc/testsuite/
* gcc.target/aarch64/nofp_2.c: New test.

2 years agoLoongArch: Fix pr106828 by define hook TARGET_ASAN_SHADOW_OFFSET in loongarch backend...
Lulu Cheng [Wed, 7 Sep 2022 03:25:45 +0000 (11:25 +0800)]
LoongArch: Fix pr106828 by define hook TARGET_ASAN_SHADOW_OFFSET in loongarch backend [PR106828].

gcc/ChangeLog:

PR target/106828
* config/loongarch/loongarch.cc (loongarch_asan_shadow_offset): New.
(TARGET_ASAN_SHADOW_OFFSET): New.

gcc/testsuite/ChangeLog:

PR target/106828
* g++.target/loongarch/pr106828.C: New test.

2 years agoopenmp: Fix handling of target constructs in static member functions [PR106829]
Jakub Jelinek [Wed, 7 Sep 2022 06:54:13 +0000 (08:54 +0200)]
openmp: Fix handling of target constructs in static member functions [PR106829]

Just calling current_nonlambda_class_type in static member functions returns
non-NULL, but something that isn't *this and if unlucky can match part of the
IL and can be added to target clauses.
      if (DECL_NONSTATIC_MEMBER_P (decl)
          && current_class_ptr)
is a guard used elsewhere (in check_accessibility_of_qualified_id).

2022-09-07  Jakub Jelinek  <jakub@redhat.com>

PR c++/106829
* semantics.cc (finish_omp_target_clauses): If current_function_decl
isn't a nonstatic member function, don't set data.current_object to
non-NULL.

* g++.dg/gomp/pr106829.C: New test.

2 years agolibcpp: Named universal character escapes and delimited escape sequence tweaks
Jakub Jelinek [Wed, 7 Sep 2022 06:44:38 +0000 (08:44 +0200)]
libcpp: Named universal character escapes and delimited escape sequence tweaks

On Tue, Aug 30, 2022 at 09:10:37PM +0000, Joseph Myers wrote:
> I'm seeing build failures of glibc for powerpc64, as illustrated by the
> following C code:
>
> #if 0
> \NARG
> #endif
>
> (the actual sysdeps/powerpc/powerpc64/sysdep.h code is inside #ifdef
> __ASSEMBLER__).
>
> This shows some problems with this feature - and with delimited escape
> sequences - as it affects C.  It's fine to accept it as an extension
> inside string and character literals, because \N or \u{...} would be
> invalid in the absence of the feature (i.e. the syntax for such literals
> fails to match, meaning that the rule about undefined behavior for a
> single ' or " as a pp-token applies).  But outside string and character
> literals, the usual lexing rules apply, the \ is a pp-token on its own and
> the code is valid at the preprocessing level, and with expansion of macros
> appearing before or after the \ (e.g. u defined as a macro in the \u{...}
> case) it may be valid code at the language level as well.  I don't know
> what older C++ versions say about this, but for C this means e.g.
>
> #define z(x) 0
> #define a z(
> int x = a\NARG);
>
> needs to be accepted as expanding to "int x = 0;", not interpreted as
> using the \N feature in an identifier and produce an error.

The following patch changes this, so that:
1) outside of string/character literals, \N without following { is never
   treated as an error nor warning, it is silently treated as \ separate
   token followed by whatever is after it
2) \u{123} and \N{LATIN SMALL LETTER A WITH ACUTE} are not handled as
   extension at all outside of string/character literals in the strict
   standard modes (-std=c*) except for -std=c++{23,2b}, only in the
   -std=gnu* modes, because it changes behavior on valid sources, e.g.
   #define z(x) 0
   #define a z(
   int x = a\u{123});
   int y = a\N{LATIN SMALL LETTER A WITH ACUTE});
3) introduces -Wunicode warning (on by default) and warns for cases
   of what looks like invalid delimited escape sequence or named
   universal character escape outside of string/character literals
   and is treated as separate tokens

2022-09-07  Jakub Jelinek  <jakub@redhat.com>

libcpp/
* include/cpplib.h (struct cpp_options): Add cpp_warn_unicode member.
(enum cpp_warning_reason): Add CPP_W_UNICODE.
* init.cc (cpp_create_reader): Initialize cpp_warn_unicode.
* charset.cc (_cpp_valid_ucn): In possible identifier contexts, don't
handle \u{ or \N{ specially in -std=c* modes except -std=c++2{3,b}.
In possible identifier contexts, don't emit an error and punt
if \N isn't followed by {, or if \N{} surrounds some lower case
letters or _.  In possible identifier contexts when not C++23, don't
emit an error but warning about unknown character names and treat as
separate tokens.  When treating as separate tokens \u{ or \N{, emit
warnings.
gcc/
* doc/invoke.texi (-Wno-unicode): Document.
gcc/c-family/
* c.opt (Winvalid-utf8): Use ObjC instead of objC.  Remove
" in comments" from description.
(Wunicode): New option.
gcc/testsuite/
* c-c++-common/cpp/delimited-escape-seq-4.c: New test.
* c-c++-common/cpp/delimited-escape-seq-5.c: New test.
* c-c++-common/cpp/delimited-escape-seq-6.c: New test.
* c-c++-common/cpp/delimited-escape-seq-7.c: New test.
* c-c++-common/cpp/named-universal-char-escape-5.c: New test.
* c-c++-common/cpp/named-universal-char-escape-6.c: New test.
* c-c++-common/cpp/named-universal-char-escape-7.c: New test.
* g++.dg/cpp23/named-universal-char-escape1.C: New test.
* g++.dg/cpp23/named-universal-char-escape2.C: New test.

2 years agors6000: remove unused splitter on const_scalar_int_operand
Jiufu Guo [Wed, 7 Sep 2022 05:32:55 +0000 (13:32 +0800)]
rs6000: remove unused splitter on const_scalar_int_operand

There are two splitters, both are calling rs6000_emit_set_const to emit
instructions for constant building.
One splitter checks `const_int_operand`, this splitter is always used.
Another spitter checks `const_scalar_int_operand`, this one is never
used now.

Checking the history, that splitter is introduced around 1999 for
HOST_BITS_PER_WIDE_INT=32, as below:

(define_split
  [(set (match_operand:DI 0 "gpc_reg_operand" "")
(match_operand:DI 1 "const_double_operand" ""))]
  "HOST_BITS_PER_WIDE_INT == 32 && TARGET_POWERPC64
   && num_insns_constant (operands[1], DImode) > 1"

And `HOST_BITS_PER_WIDE_INT == 32` is eliminated later, since it is
`const_double_operand` can cover it.
When wide_int is introduced, `const_double_operand` is replaced by
`const_scalar_int_operand`.

Now, HOST_BITS_PER_WIDE_INT is forced to 64, this splitter is safe
to remove.

gcc/ChangeLog:

* config/rs6000/rs6000.md (const_scalar_int splitter): Remove.

2 years agors6000: fix misleading new patterns of splitters
Jiufu Guo [Thu, 11 Aug 2022 12:01:28 +0000 (20:01 +0800)]
rs6000: fix misleading new patterns of splitters

As a comment in
https://gcc.gnu.org/pipermail/gcc-patches/2022-August/599556.html

Those splitters call rs6000_emit_set_const directly, and the replacements
are never used.  Using (pc) would be less misleading.

gcc/ChangeLog:

* config/rs6000/rs6000.md: (constant splitters): Use "(pc)" as the
replacements.

2 years agoruntime: ignore __morestack function in runtime.Callers
Ian Lance Taylor [Sat, 3 Sep 2022 17:37:07 +0000 (10:37 -0700)]
runtime: ignore __morestack function in runtime.Callers

We were ignoring all functions starting with "__morestack_", but not
the function "__morestack" itself.  Without this change, some tests
such as recover.go started failing recently, though I'm not sure
exactly what changed.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/427935

2 years agors6000/test: Fix empty TU in some cases of effective targets [PR106345]
Kewen Lin [Wed, 7 Sep 2022 01:37:57 +0000 (20:37 -0500)]
rs6000/test: Fix empty TU in some cases of effective targets [PR106345]

As the failure of test case gcc.target/powerpc/pr92398.p9-.c in
PR106345 shows, some test sources for some powerpc effective
targets use empty translation unit wrongly.  The test sources
could go with options like "-ansi -pedantic-errors", then those
effective target checkings will fail unexpectedly with the
error messages like:

  error: ISO C forbids an empty translation unit [-Wpedantic]

This patch is to fix empty TUs with one dummy function definition
accordingly.

PR testsuite/106345

gcc/testsuite/ChangeLog:

* lib/target-supports.exp (check_effective_target_powerpc_sqrt): Add
a function definition to avoid pedwarn about empty translation unit.
(check_effective_target_has_arch_pwr5): Likewise.
(check_effective_target_has_arch_pwr6): Likewise.
(check_effective_target_has_arch_pwr7): Likewise.
(check_effective_target_has_arch_pwr8): Likewise.
(check_effective_target_has_arch_pwr9): Likewise.
(check_effective_target_has_arch_pwr10): Likewise.
(check_effective_target_has_arch_ppc64): Likewise.
(check_effective_target_ppc_float128): Likewise.
(check_effective_target_ppc_float128_insns): Likewise.
(check_effective_target_powerpc_vsx): Likewise.

2 years agoExtend vectorizer to handle nonlinear induction for neg, mul/lshift/rshift with a...
liuhongt [Thu, 4 Aug 2022 01:04:22 +0000 (09:04 +0800)]
Extend vectorizer to handle nonlinear induction for neg, mul/lshift/rshift with a constant.

For neg, the patch create a vec_init as [ a, -a, a, -a, ...  ] and no
vec_step is needed to update vectorized iv since vf is always multiple
of 2(negative * negative is positive).

For shift, the patch create a vec_init as [ a, a >> c, a >> 2*c, ..]
as vec_step as [ c * nunits, c * nunits, c * nunits, ... ], vectorized iv is
updated as vec_def = vec_init >>/<< vec_step.

For mul, the patch create a vec_init as [ a, a * c, a * pow(c, 2), ..]
as vec_step as [ pow(c,nunits), pow(c,nunits),...] iv is updated as vec_def =
vec_init * vec_step.

The patch handles nonlinear iv for
1. Integer type only, floating point is not handled.
2. No slp_node.
3. iv_loop should be same as vector loop, not nested loop.
4. No UD is created, for mul, use unsigned mult to avoid UD, for
   shift, shift count should be less than type precision.

gcc/ChangeLog:

PR tree-optimization/103144
* tree-vect-loop.cc (vect_is_nonlinear_iv_evolution): New function.
(vect_analyze_scalar_cycles_1): Detect nonlinear iv by upper function.
(vect_create_nonlinear_iv_init): New function.
(vect_peel_nonlinear_iv_init): Ditto.
(vect_create_nonlinear_iv_step): Ditto
(vect_create_nonlinear_iv_vec_step): Ditto
(vect_update_nonlinear_iv): Ditto
(vectorizable_nonlinear_induction): Ditto.
(vectorizable_induction): Call
vectorizable_nonlinear_induction when induction_type is not
vect_step_op_add.
* tree-vect-loop-manip.cc (vect_update_ivs_after_vectorizer):
Update nonlinear iv for epilogue loop.
* tree-vectorizer.h (enum vect_induction_op_type): New enum.
(STMT_VINFO_LOOP_PHI_EVOLUTION_TYPE): New Macro.

gcc/testsuite/ChangeLog:

* gcc.target/i386/pr103144-mul-1.c: New test.
* gcc.target/i386/pr103144-mul-2.c: New test.
* gcc.target/i386/pr103144-neg-1.c: New test.
* gcc.target/i386/pr103144-neg-2.c: New test.
* gcc.target/i386/pr103144-shift-1.c: New test.
* gcc.target/i386/pr103144-shift-2.c: New test.

2 years agoDaily bump.
GCC Administrator [Wed, 7 Sep 2022 00:17:51 +0000 (00:17 +0000)]
Daily bump.

2 years agoc++: C++23 operator[] allows default arguments
Jason Merrill [Tue, 6 Sep 2022 18:18:39 +0000 (14:18 -0400)]
c++: C++23 operator[] allows default arguments

This usage was intended to be allowed by P2128, but it didn't make it into
the final wording.  Fixed by CWG 2507.

DR2507

gcc/cp/ChangeLog:

* decl.cc (grok_op_properties): Return sooner for C++23 op[].

gcc/testsuite/ChangeLog:

* g++.dg/cpp23/subscript8.C: New test.

2 years agotree-optimization/106754 - fix compute_control_dep_chain defect
Richard Biener [Tue, 6 Sep 2022 11:46:00 +0000 (13:46 +0200)]
tree-optimization/106754 - fix compute_control_dep_chain defect

The following handles the situation of a loop exit along the
control path to the PHI def or from there to the use in a different
way, aoviding premature abort of the walks as noticed in the two
cases where the exit is outermost (gcc.dg/uninit-pred-11.c) or
wrapped in a condition that is on the path (gcc.dg/uninit-pred-12.c).
Instead of handling such exits during recursion we now pick them
up in the parent when walking post-dominators.  That requires an
additional post-dominator walk at the outermost level which is
facilitated by splitting out the walk to a helper function and
the existing wrapper added earlier.

The patch also removes the bogus early exit from
uninit_analysis::init_use_preds, fixing a simplified version
of the PR106155 testcase.

PR tree-optimization/106754
* gimple-predicate-analysis.cc (compute_control_dep_chain_pdom):
New function, split out from compute_control_dep_chain.  Handle
loop-exit like conditions here by pushing to the control vector.
(compute_control_dep_chain): Adjust and streamline dumping.
In the wrapper perform a post-dominator walk as well.
(uninit_analysis::init_use_preds): Remove premature early exit.

* gcc.dg/uninit-pred-12.c: New testcase.
* gcc.dg/uninit-pr106155-1.c: Likewise.

2 years agoxtensa: gcc: add static PIE support
Max Filippov [Sat, 13 Aug 2022 04:02:15 +0000 (21:02 -0700)]
xtensa: gcc: add static PIE support

gcc/
* config/xtensa/linux.h (LINK_SPEC): Add static-pie.

2 years agoHandle > INF and < INF correctly in range-op-float.cc
Aldy Hernandez [Tue, 6 Sep 2022 06:20:54 +0000 (08:20 +0200)]
Handle > INF and < INF correctly in range-op-float.cc

The gfortran.dg/minlocval*.f90 tests are generating conditionals past
the infinities.  For example:

if (x <= +Inf)
  foo (x);
else
  bar (x);

It seems to me that the only possible value for x on the false side is
either NAN or undefined (for !HONOR_NANS).

gcc/ChangeLog:

* range-op-float.cc (build_le): Handle NANs and going past infinity.
(build_lt): Same.
(build_ge): Same.
(build_gt): Same.
(foperator_lt::op1_range): Avoid adjustments to range if build_*
returned false.
(foperator_lt::op2_range): Same.
(foperator_le::op1_range): Same.
(foperator_le::op2_range): Same.
(foperator_gt::op1_range): Same.
(foperator_gt::op2_range): Same.

gcc/testsuite/ChangeLog:

* gcc.dg/tree-ssa/vrp-float-inf-1.c: New test.

2 years agoFix use predicate computation for uninit analysis
Richard Biener [Tue, 6 Sep 2022 09:56:04 +0000 (11:56 +0200)]
Fix use predicate computation for uninit analysis

In uninit analysis we try to prove that a use is always properly guarded
so it is never reached when the used value is not initialized.  This
fails to be conservative when during the computation of the use
predicate components of the || .. || .. chain are dropped so we have
to detect this case and fall back to the conservative computation.

* gimple-predicate-analysis.cc (compute_control_dep_chain):
Add output flag to indicate whether we possibly have dropped
any chains.  Return whether the info is complete from the
wrapping overload.
(uninit_analysis::init_use_preds): Adjust accordingly, with
a workaround for PR106754.
(uninit_analysis::init_from_phi_def): Properly guard the
case where we complete an empty chain.

2 years agolibstdc++: Fix pretty printer tests of tuple indexes
Philipp Fent [Sun, 4 Sep 2022 18:47:34 +0000 (20:47 +0200)]
libstdc++: Fix pretty printer tests of tuple indexes

Signed-off-by: Philipp Fent <fent@in.tum.de>
libstdc++-v3/ChangeLog:

* testsuite/libstdc++-prettyprinters/48362.cc: Fix expected
tuple indices.
* testsuite/libstdc++-prettyprinters/cxx11.cc: Likewise.

2 years agoDocument unused function argument
Jan-Benedict Glaw [Tue, 6 Sep 2022 11:05:21 +0000 (13:05 +0200)]
Document unused function argument

This patch fixes a small warning about the unused outer_rtx argument in the
msp430 backend.

2022-09-06  Jan-Benedict Glaw  <jbglaw@lug-owl.de>

gcc/ChangeLog:
* config/msp430/msp430.cc (msp430_single_op_cost): Document unused argument.

2 years agotree-ssa-forwprop.cc: Adjust res_type when operands have differing vector lengths.
Prathamesh Kulkarni [Tue, 6 Sep 2022 09:48:04 +0000 (15:18 +0530)]
tree-ssa-forwprop.cc: Adjust res_type when operands have differing vector lengths.

gcc/
* tree-ssa-forwprop.cc (simplify_permutation): Set res_type to a vector
type with same element type as arg0, and length as op2.