platform/upstream/gcc.git
3 years agoc++: Register streamed-in decls when new [PR 99040]
Nathan Sidwell [Fri, 12 Feb 2021 14:55:49 +0000 (06:55 -0800)]
c++: Register streamed-in decls when new [PR 99040]

With modules one can have using-decls refering to their own scope.  This
is the way to export things from the GMF or from an import.  The
problem was I was using current_ns == CP_DECL_CONTEXT (decl) to
determine whether a decl should be registered in a namespace level or
not.  But that's an inadequate check and we ended up reregistering
decls and creating a circular list.  We should be registering the decl
when first encountered -- whether we bind it is orthogonal to that.

PR c++/99040
gcc/cp/
* module.cc (trees_in::decl_value): Call add_module_namespace_decl
for new namespace-scope entities.
(module_state::read_cluster): Don't call add_module_decl here.
* name-lookup.h (add_module_decl): Rename to ...
(add_module_namespace_decl): ... this.
* name-lookup.c (newbinding_bookkeeping): Move into ...
(do_pushdecl): ... here.  Its only remaining caller.
(add_module_decl): Rename to ...
(add_module_namespace_decl): ... here.  Add checking-assert for
circularity. Don't call newbinding_bookkeeping, just extern_c
checking and incomplete var checking.
gcc/testsuite/
* g++.dg/modules/pr99040_a.C: New.
* g++.dg/modules/pr99040_b.C: New.
* g++.dg/modules/pr99040_c.C: New.
* g++.dg/modules/pr99040_d.C: New.

3 years agoExpunge namespace-scope IDENTIFIER_TYPE_VALUE & global_type_name [PR 99039]
Nathan Sidwell [Thu, 11 Feb 2021 21:06:03 +0000 (13:06 -0800)]
Expunge namespace-scope IDENTIFIER_TYPE_VALUE & global_type_name [PR 99039]

IDENTIFIER_TYPE_VALUE and friends is a remnant of G++'s C origins.  It
holds elaborated types on identifier-nodes.  While this is fine for C
and for local and class-scopes in C++, it fails badly for namespaces.
In that case a marker 'global_type_node' was used, which essentially
signified 'this is a namespace-scope type *somewhere*', and you'd have
to do a regular name_lookup to find it.  As the parser and
substitution machinery has avanced over the last 25 years or so,
there's not much outside of actual name-lookup that uses that.
Amusingly the IDENTIFIER_HAS_TYPE_VALUE predicate will do an actual
name-lookup and then users would repeat that lookup to find the
now-known to be there type.

Rather late I realized that this interferes with the lazy loading of
module entities, because we were setting IDENTIFIER_TYPE_VALUE to
global_type_node.  But we could be inside some local scope where that
identifier is bound to some local type.  Not good!

Rather than add more cruft to look at an identifier's shadow stack and
alter that as necessary, this takes the approach of removing the
existing cruft.

We nuke the few places outside of name lookup that use
IDENTIFIER_TYPE_VALUE.  Replacing them with either proper name
lookups, alternative sequences, or in some cases asserting that they
(no longer) happen.  Class template instantiation was calling pushtag
after setting IDENTIFIER_TYPE_VALUE in order to stop pushtag creating
an implicit typedef and pushing it, but to get the bookkeeping it
needed.  Let's just do the bookkeeping directly.

Then we can stop having a 'bound at namespace-scope' marker at all,
which means lazy loading won't screw up local shadow stacks.  Also, it
simplifies set_identifier_type_value_with_scope, as it never needs to
inspect the scope stack.  When developing this patch, I discovered a
number of places we'd put an actual namespace-scope type on the
type_value slot, rather than global_type_node.  You might notice this
is killing at least two 'why are we doing this?' comments.

While this doesn't fix the two PRs mentioned, it is a necessary step.

PR c++/99039
PR c++/99040
gcc/cp/
* cp-tree.h (CPTI_GLOBAL_TYPE): Delete.
(global_type_node): Delete.
(IDENTIFIER_TYPE_VALUE): Delete.
(IDENTIFIER_HAS_TYPE_VALUE): Delete.
(get_type_value): Delete.
* name-lookup.h (identifier_type_value): Delete.
* name-lookup.c (check_module_override): Don't
SET_IDENTIFIER_TYPE_VALUE here.
(do_pushdecl): Nor here.
(identifier_type_value_1, identifier_type_value): Delete.
(set_identifier_type_value_with_scope): Only
SET_IDENTIFIER_TYPE_VALUE for local and class scopes.
(pushdecl_nanmespace_level): Remove shadow stack nadgering.
(do_pushtag): Use REAL_IDENTIFIER_TYPE_VALUE.
* call.c (check_dtor_name): Use lookup_name.
* decl.c (cxx_init_decl_processing): Drop global_type_node.
* decl2.c (cplus_decl_attributes): Don't SET_IDENTIFIER_TYPE_VALUE
here.
* init.c (get_type_value): Delete.
* pt.c (instantiate_class_template_1): Don't call pushtag or
SET_IDENTIFIER_TYPE_VALUE here.
(tsubst): Assert never an identifier.
(dependent_type_p): Drop global_type_node assert.
* typeck.c (error_args_num): Don't use IDENTIFIER_HAS_TYPE_VALUE
to determine ctorness.
gcc/testsuite/
* g++.dg/lookup/pr99039.C: New.

3 years agocompiler: open byte slice and string embeds using the absolute path
Michael Matloob [Fri, 12 Feb 2021 00:28:57 +0000 (19:28 -0500)]
compiler: open byte slice and string embeds using the absolute path

The paths vector contains the names of the files that the embed_files_
map is keyed by. While the code processing embed.FS values looks up
the paths in the embed_files_ map, the code processing string and byte
slice embeds tries opening the files using their names directly. Look
up the full paths in the embed_files_ map when opening them.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/291429

3 years agoPR c/99055 - memory leak in warn_parm_array_mismatch
Martin Sebor [Fri, 12 Feb 2021 18:18:17 +0000 (11:18 -0700)]
PR c/99055 - memory leak in warn_parm_array_mismatch

gcc/c-family/ChangeLog:

PR c/99055
* c-warn.c (warn_parm_array_mismatch): Free strings returned from
print_generic_expr_to_str.

gcc/ChangeLog:

* tree-pretty-print.c (print_generic_expr_to_str): Update comment.

3 years agolibgfortran: Fix PR95647 by changing the interfaces of operators .eq. and .ne.
Steve Kargl [Fri, 12 Feb 2021 15:58:16 +0000 (07:58 -0800)]
libgfortran: Fix PR95647 by changing the interfaces of operators .eq. and .ne.

The FE converts the old school .eq. to ==,
and then tracks the ==.  The module starts with == and so it does not
properly overload the .eq.  Reversing the interfaces fixes this.

2021-02-12  Steve Kargl <sgk@troutmask.apl.washington.edu>

libgfortran/ChangeLog:

PR libfortran/95647
* ieee/ieee_arithmetic.F90: Flip interfaces of operators .eq. to
== and .ne. to /= .

gcc/testsuite/ChangeLog:

PR libfortran/95647
* gfortran.dg/ieee/ieee_12.f90: New test.

3 years agortl-ssa: Use right obstack for temporary allocation
Richard Sandiford [Fri, 12 Feb 2021 15:54:49 +0000 (15:54 +0000)]
rtl-ssa: Use right obstack for temporary allocation

I noticed while working on PR98863 that we were using the main
obstack to allocate temporary uses.  That was safe, but represents
a kind of local memory leak.

gcc/
* rtl-ssa/accesses.cc (function_info::make_use_available): Use
m_temp_obstack rather than m_obstack to allocate the temporary use.

3 years agodf: Record all definitions in DF_LR_BB_INFO->def [PR98863]
Richard Sandiford [Fri, 12 Feb 2021 15:54:48 +0000 (15:54 +0000)]
df: Record all definitions in DF_LR_BB_INFO->def [PR98863]

df_lr_bb_local_compute has:

      FOR_EACH_INSN_INFO_DEF (def, insn_info)
/* If the def is to only part of the reg, it does
   not kill the other defs that reach here.  */
if (!(DF_REF_FLAGS (def) & (DF_REF_PARTIAL | DF_REF_CONDITIONAL)))

However, as noted in the comment in the patch and below, almost all
partial definitions have an associated use.  This means that the
confluence function:

  IN = (OUT & ~DEF) | USE

is unaffected by whether partial definitions are in DEF or not.

Even though the choice doesn't matter for the LR problem itself,
it's IMO much more convenient for consumers if DEF contains all the
definitions in the block.  The only pre-RTL-SSA code that tries to
consume DEF directly is shrink-wrap.c, which already has to work
around the incompleteness of the information:

  /* DF_LR_BB_INFO (bb)->def does not comprise the DF_REF_PARTIAL and
     DF_REF_CONDITIONAL defs.  So if DF_LIVE doesn't exist, i.e.
     at -O1, just give up searching NEXT_BLOCK.  */

I hit the same problem when trying to fix the RTL-SSA part of PR98863.

This patch treats partial definitions as both a def and a use,
just like the df_ref records almost always do.

To show that partial definitions almost always have uses:

  DF_REF_CONDITIONAL:

    Added by:

      case COND_EXEC:
df_defs_record (collection_rec, COND_EXEC_CODE (x),
bb, insn_info, DF_REF_CONDITIONAL);
break;

    Later, df_get_conditional_uses creates uses for all DF_REF_CONDITIONAL
    definitions.

  DF_REF_PARTIAL:

    In total, there are 4 locations at which we add partial definitions.

    Case 1:

      if (GET_CODE (dst) == STRICT_LOW_PART)
{
  flags |= DF_REF_READ_WRITE | DF_REF_PARTIAL | DF_REF_STRICT_LOW_PART;

  loc = &XEXP (dst, 0);
  dst = *loc;
}

    Corresponding use:

      case STRICT_LOW_PART:
{
  rtx *temp = &XEXP (dst, 0);
  /* A strict_low_part uses the whole REG and not just the
   SUBREG.  */
  dst = XEXP (dst, 0);
  df_uses_record (collection_rec,
  (GET_CODE (dst) == SUBREG) ? &SUBREG_REG (dst) : temp,
  DF_REF_REG_USE, bb, insn_info,
  DF_REF_READ_WRITE | DF_REF_STRICT_LOW_PART);
}
break;

    Case 2:

      if (GET_CODE (dst) == ZERO_EXTRACT)
{
  flags |= DF_REF_READ_WRITE | DF_REF_PARTIAL | DF_REF_ZERO_EXTRACT;

  loc = &XEXP (dst, 0);
  dst = *loc;
}

    Corresponding use:

      case ZERO_EXTRACT:
{
  df_uses_record (collection_rec, &XEXP (dst, 1),
  DF_REF_REG_USE, bb, insn_info, flags);
  df_uses_record (collection_rec, &XEXP (dst, 2),
  DF_REF_REG_USE, bb, insn_info, flags);
  if (GET_CODE (XEXP (dst,0)) == MEM)
    df_uses_record (collection_rec, &XEXP (dst, 0),
    DF_REF_REG_USE, bb, insn_info,
    flags);
  else
    df_uses_record (collection_rec, &XEXP (dst, 0),
    DF_REF_REG_USE, bb, insn_info,
    DF_REF_READ_WRITE | DF_REF_ZERO_EXTRACT);
----------------------------^^^^^^^^^^^^^^^^^
}
break;

    Case 3:

      else if (GET_CODE (dst) == SUBREG && REG_P (SUBREG_REG (dst)))
{
  if (read_modify_subreg_p (dst))
    flags |= DF_REF_READ_WRITE | DF_REF_PARTIAL;

  flags |= DF_REF_SUBREG;

  df_ref_record (DF_REF_REGULAR, collection_rec,
 dst, loc, bb, insn_info, DF_REF_REG_DEF, flags);
}

    Corresponding use:

      case SUBREG:
if (read_modify_subreg_p (dst))
  {
    df_uses_record (collection_rec, &SUBREG_REG (dst),
    DF_REF_REG_USE, bb, insn_info,
    flags | DF_REF_READ_WRITE | DF_REF_SUBREG);
    break;
  }

    Case 4:

      /*  If this is a multiword hardreg, we create some extra
  datastructures that will enable us to easily build REG_DEAD
  and REG_UNUSED notes.  */
      if (collection_rec
  && (endregno != regno + 1) && insn_info)
{
  /* Sets to a subreg of a multiword register are partial.
     Sets to a non-subreg of a multiword register are not.  */
  if (GET_CODE (reg) == SUBREG)
    ref_flags |= DF_REF_PARTIAL;
  ref_flags |= DF_REF_MW_HARDREG;

    Corresponding use:

      None.  However, this case should be rare to non-existent on most
      targets, and the current handling seems suspect.  See the comment
      in the patch for more details.

gcc/
* df-problems.c (df_lr_bb_local_compute): Treat partial definitions
as read-modify operations.

gcc/testsuite/
* gcc.dg/rtl/aarch64/multi-subreg-1.c: New test.

3 years agolibstdc++: Re-enable workaround for _wstat64 bug, again [PR 88881]
Jonathan Wakely [Wed, 10 Feb 2021 16:51:34 +0000 (16:51 +0000)]
libstdc++: Re-enable workaround for _wstat64 bug, again [PR 88881]

I forgot that the workaround is present in both filesystem::status and
filesystem::symlink_status. This restores it in the latter.

libstdc++-v3/ChangeLog:

PR libstdc++/88881
* src/c++17/fs_ops.cc (fs::symlink_status): Re-enable workaround.

3 years agolibstdc++: Fix filesystem::rename on Windows [PR 98985]
Jonathan Wakely [Fri, 12 Feb 2021 15:13:02 +0000 (15:13 +0000)]
libstdc++: Fix filesystem::rename on Windows [PR 98985]

The _wrename function won't overwrite an existing file, so use
MoveFileEx instead. That allows renaming directories over files, which
POSIX doesn't allow, so check for that case explicitly and report an
error.

Also document the deviation from the expected behaviour, and add a test
for filesystem::rename which was previously missing.

The Filesystem TS experimental::filesystem::rename doesn't have that
extra code to handle directories correctly, so the relevant parts of the
new test are not run on Windows.

libstdc++-v3/ChangeLog:

* doc/xml/manual/status_cxx2014.xml: Document implementation
specific properties of std::experimental::filesystem::rename.
* doc/xml/manual/status_cxx2017.xml: Document implementation
specific properties of std::filesystem::rename.
* doc/html/*: Regenerate.
* src/c++17/fs_ops.cc (fs::rename): Implement correct behaviour
for directories on Windows.
* src/filesystem/ops-common.h (__gnu_posix::rename): Use
MoveFileExW on Windows.
* testsuite/27_io/filesystem/operations/rename.cc: New test.
* testsuite/experimental/filesystem/operations/rename.cc: New test.

3 years agolibstdc++: Make "nonexistent" paths less predictable in filesystem tests
Jonathan Wakely [Fri, 12 Feb 2021 15:13:02 +0000 (15:13 +0000)]
libstdc++: Make "nonexistent" paths less predictable in filesystem tests

The helper function for creating new paths doesn't work well on Windows,
because the PID of a process started by Wine is very consistent and so
the same path gets created each time.

libstdc++-v3/ChangeLog:

* testsuite/util/testsuite_fs.h (nonexistent_path): Add
random number to the path.

3 years agolibstdc++: Include scope ID in net::internet::address_v6::to_string()
Jonathan Wakely [Fri, 12 Feb 2021 15:08:29 +0000 (15:08 +0000)]
libstdc++: Include scope ID in net::internet::address_v6::to_string()

libstdc++-v3/ChangeLog:

* include/experimental/internet (address_v6::to_string): Include
scope ID in string.
* testsuite/experimental/net/internet/address/v6/members.cc:
Test to_string() results.

3 years agolibstdc++: Fix errors in <experimental/internet>
Jonathan Wakely [Fri, 12 Feb 2021 13:01:20 +0000 (13:01 +0000)]
libstdc++: Fix errors in <experimental/internet>

libstdc++-v3/ChangeLog:

* include/experimental/internet (address_v6::any): Avoid using
memcpy in constexpr function.
(address_v6::loopback): Likewise.
(make_address_v6): Fix missing return statements on error paths.
* include/experimental/io_context: Avoid -Wdangling-else
warning.
* testsuite/experimental/net/internet/address/v4/members.cc:
Remove unused variables.
* testsuite/experimental/net/internet/address/v6/members.cc:
New test.

3 years agolibstdc++: Add unused attributes to shared_ptr functions
Jonathan Wakely [Fri, 12 Feb 2021 10:36:18 +0000 (10:36 +0000)]
libstdc++: Add unused attributes to shared_ptr functions

This avoids some warnings when building with -fno-rtti because the
function parameters are only used when RTTI is enabled.

libstdc++-v3/ChangeLog:

* include/bits/shared_ptr_base.h (__shared_ptr::_M_get_deleter):
Add unused attribute to parameter.
* src/c++11/shared_ptr.cc (_Sp_make_shared_tag::_S_eq):
Likewise.

3 years agolibstdc++: XFAIL tests that depends on RTTI
Jonathan Wakely [Fri, 12 Feb 2021 11:30:38 +0000 (11:30 +0000)]
libstdc++: XFAIL tests that depends on RTTI

The std::emit_on_flush manipulator depends on dynamic_cast, so fails
without RTTI.

The std::async code can't catch a forced_unwind exception when RTTI is
disabled, so it can't rethrow it either, and the test aborts.

libstdc++-v3/ChangeLog:

* testsuite/27_io/basic_ostream/emit/1.cc: Expect test to fail
if -fno-rtti is used.
* testsuite/30_threads/async/forced_unwind.cc: Expect test
to abort if -fno-rtti is used.

3 years agolibstdc++: Make test memory_resource work without exceptions and RTTI
Jonathan Wakely [Fri, 12 Feb 2021 11:23:28 +0000 (11:23 +0000)]
libstdc++: Make test memory_resource work without exceptions and RTTI

libstdc++-v3/ChangeLog:

* testsuite/util/testsuite_allocator.h (memory_resource):
Remove requirement for RTTI and exceptions to be enabled.

3 years agolibstdc++: Only use dynamic_cast in tests when RTTI is enabled
Jonathan Wakely [Fri, 12 Feb 2021 11:09:00 +0000 (11:09 +0000)]
libstdc++: Only use dynamic_cast in tests when RTTI is enabled

libstdc++-v3/ChangeLog:

* testsuite/27_io/basic_istringstream/rdbuf/char/2832.cc: Use
static_cast when RTTI is disabled.
* testsuite/27_io/basic_istringstream/rdbuf/wchar_t/2832.cc:
Likewise.
* testsuite/27_io/basic_ostringstream/rdbuf/char/2832.cc:
Likewise.
* testsuite/27_io/basic_ostringstream/rdbuf/wchar_t/2832.cc:
Likewise.
* testsuite/27_io/basic_stringstream/str/char/2.cc:
Likewise.
* testsuite/27_io/basic_stringstream/str/wchar_t/2.cc:
Likewise.

3 years agolibstdc++: Fix errors when syncbuf is used without RTTI
Jonathan Wakely [Fri, 12 Feb 2021 11:36:27 +0000 (11:36 +0000)]
libstdc++: Fix errors when syncbuf is used without RTTI

libstdc++-v3/ChangeLog:

* include/std/ostream (__syncbuf_base::_S_get): Mark parameter
as unused and only use dynamic_cast when RTTI is enabled.

3 years agolibstdc++: Fix bootstrap with -fno-rtti [PR 99077]
Jonathan Wakely [Fri, 12 Feb 2021 10:37:56 +0000 (10:37 +0000)]
libstdc++: Fix bootstrap with -fno-rtti [PR 99077]

When libstdc++ is built without RTTI the __ios_failure type is just an
alias for std::ios_failure, so trying to construct it from an int won't
compile. This changes the RTTI-enabled __ios_failure type to have the
same constructor parameters as std::ios_failure, so that the constructor
takes the same arguments whether RTTI is enabled or not.

The __throw_ios_failure function now constructs the error_code, instead
of the __ios_failure constructor. As a drive-by fix that error_code is
constructed with std::generic_category() not std::system_category(),
because the int comes from errno which corresponds to the generic
category.

libstdc++-v3/ChangeLog:

PR libstdc++/99077
* src/c++11/cxx11-ios_failure.cc (__ios_failure(const char*, int)):
Change int parameter to error_code, to match std::ios_failure.
(__throw_ios_failure(const char*, int)): Construct error_code
from int parameter.

3 years agotestsuite, arm: Add -mthumb to pr98931.c [PR target/98931]
Christophe Lyon [Fri, 12 Feb 2021 14:14:45 +0000 (14:14 +0000)]
testsuite, arm: Add -mthumb to pr98931.c [PR target/98931]

This test forces -march=armv8.1-m.main, which supports only Thumb mode.
However, if the toolchain is not configured --with-thumb, the test
fails with:
error: target CPU does not support ARM mode

Adding -mthumb to dg-options fixes the problem.

2021-02-12  Christophe Lyon  <christophe.lyon@linaro.org>

PR target/98931
gcc/testsuite/
* gcc.target/arm/pr98931.c: Add -mthumb

3 years ago[Ada] Remove unused subprograms (continued)
Arnaud Charlet [Fri, 12 Feb 2021 07:54:07 +0000 (02:54 -0500)]
[Ada] Remove unused subprograms (continued)

gcc/ada/

* repinfo.ads, repinfo.adb (*SO_Ref*): Restore.

3 years agoFortran: Fix rank of assumed-rank array [PR99043]
Tobias Burnus [Fri, 12 Feb 2021 13:43:41 +0000 (14:43 +0100)]
Fortran: Fix rank of assumed-rank array [PR99043]

gcc/fortran/ChangeLog:

PR fortran/99043
* trans-expr.c (gfc_conv_procedure_call): Don't reset
rank of assumed-rank array.

gcc/testsuite/ChangeLog:

PR fortran/99043
* gfortran.dg/assumed_rank_20.f90: New test.

3 years agomiddle-end/38474 - fix alias walk budget accounting in IPA analysis
Richard Biener [Fri, 12 Feb 2021 10:13:36 +0000 (11:13 +0100)]
middle-end/38474 - fix alias walk budget accounting in IPA analysis

The walk_aliased_vdef calls do not update the walking budget until
it is hit by a single call (and then in one case it resumes with
no limit at all).  The following rectifies this in multiple places.
It also makes the updates more consistend and fixes
determine_known_aggregate_parts to account its own alias queries.

2021-02-12  Richard Biener  <rguenther@suse.de>

PR middle-end/38474
* ipa-fnsummary.c (unmodified_parm_1): Only walk when
fbi->aa_walk_budget is bigger than zero.  Update
fbi->aa_walk_budget.
(param_change_prob): Likewise.
* ipa-prop.c (detect_type_change_from_memory_writes):
Properly account walk_aliased_vdefs.
(parm_preserved_before_stmt_p): Canonicalize updates.
(parm_ref_data_preserved_p): Likewise.
(parm_ref_data_pass_through_p): Likewise.
(determine_known_aggregate_parts): Account own alias queries.

3 years agoFix producer string memory leaks
Martin Liska [Wed, 10 Feb 2021 12:21:22 +0000 (13:21 +0100)]
Fix producer string memory leaks

gcc/ChangeLog:

* opts-common.c (decode_cmdline_option): Release werror_arg.
* opts.c (gen_producer_string): Release output of
gen_command_line_string.

3 years agoc++: Fix endless errors on invalid requirement seq [PR97742]
Jakub Jelinek [Fri, 12 Feb 2021 08:55:46 +0000 (09:55 +0100)]
c++: Fix endless errors on invalid requirement seq [PR97742]

As the testcase shows, if we reach CPP_EOF during parsing of requirement
sequence, we end up with endless loop where we always report invalid
requirement expression, don't consume any token (as we are at eof) and
repeat.

This patch stops the loop when we reach CPP_EOF.

2021-02-12  Jakub Jelinek  <jakub@redhat.com>

PR c++/97742
* parser.c (cp_parser_requirement_seq): Stop iterating after reaching
CPP_EOF.

* g++.dg/cpp2a/concepts-requires24.C: New test.

3 years agotree-optimization/38474 - fix store-merging compile-time regression
Richard Biener [Thu, 11 Feb 2021 10:13:47 +0000 (11:13 +0100)]
tree-optimization/38474 - fix store-merging compile-time regression

The following puts a limit on the number of alias tests we do in
terminate_all_aliasing_chains which is quadratic in the number of
overall stores currentrly tracked.  There is already a limit in
place on the maximum number of stores in a single chain so the
following adds a limit on the number of chains tracked.  The
worst number of overall stores tracked from the defaults (64 and 64)
is then 4096 which when imposed as the sole limit for the testcase
still causes

 store merging                      :  71.65 ( 56%)

because the testcase is somewhat degenerate with most chains
consisting only of a single store (and 25% of exactly three stores).
The single stores are all CLOBBERs at the point variables go out of
scope.  Note unpatched we have

 store merging                      : 308.60 ( 84%)

Limiting the number of chains to 64 brings this down to

 store merging                      :   1.52 (  3%)

which is more reasonable.  There are ideas on how to make
terminate_all_aliasing_chains cheaper but for this degenerate case
they would not have any effect so I'll defer for GCC 12 for those.

I'm not sure we want to have both --params, just keeping the
more to-the-point max-stores-to-track works but makes the
degenerate case above slower.
I made the current default 1024 which for the testcasse
(without limiting chains) results in 25% compile time and 20s
putting it in the same ballpart as the next offender (which is PTA).

This is a regression on trunk and the GCC 10 branch btw.

2021-02-11  Richard Biener  <rguenther@suse.de>

PR tree-optimization/38474
* params.opt (-param=max-store-chains-to-track=): New param.
(-param=max-stores-to-track=): Likewise.
* doc/invoke.texi (max-store-chains-to-track): Document.
(max-stores-to-track): Likewise.
* gimple-ssa-store-merging.c (pass_store_merging::m_n_chains):
New.
(pass_store_merging::m_n_stores): Likewise.
(pass_store_merging::terminate_and_process_chain): Update
m_n_stores and m_n_chains.
(pass_store_merging::process_store): Likewise.   Terminate
oldest chains if the number of stores or chains get too large.
(imm_store_chain_info::terminate_and_process_chain): Dump
chain length.

3 years agoc++: variadic lambda template and empty pack [PR97246]
Jason Merrill [Fri, 12 Feb 2021 00:45:22 +0000 (19:45 -0500)]
c++: variadic lambda template and empty pack [PR97246]

In get<0>, Is is empty, so the first parameter pack of the lambda is empty,
but after the fix for PR94546 we were wrongly associating it with the
partial instantiation of 'v'.

gcc/cp/ChangeLog:

PR c++/97246
PR c++/94546
* pt.c (extract_fnparm_pack): Check DECL_PACK_P here.
(register_parameter_specializations): Not here.

gcc/testsuite/ChangeLog:

PR c++/97246
* g++.dg/cpp2a/lambda-generic-variadic21.C: New test.

3 years agolibbacktrace: check for objcopy --add-gnu-debuglink using --help
Ian Lance Taylor [Fri, 12 Feb 2021 02:09:26 +0000 (18:09 -0800)]
libbacktrace: check for objcopy --add-gnu-debuglink using --help

* configure.ac: Check for objcopy --add-gnu-debuglink by using
objcopy --help.
* configure: Regenerate

3 years agoanalyzer: fix ICE in print_mem_ref [PR98969]
David Malcolm [Fri, 12 Feb 2021 01:31:28 +0000 (20:31 -0500)]
analyzer: fix ICE in print_mem_ref [PR98969]

PR analyzer/98969 and PR analyzer/99064 describes ICEs, in both cases
within print_mem_ref, when falsely reporting memory leaks - though it
is possible to generate the ICE on other diagnostics (which I added
in one of the test cases).

This patch fixes the ICE, leaving the fix for the leak false positives
as followup work.

The analyzer uses region_model::get_representative_path_var and
region_model::get_representative_tree to map back from its svalue
and region classes to the tree type used by the rest of the compiler,
and, in particular, for diagnostics.

The root cause of the ICE is sloppiness about types within those
functions; specifically when casts were stripped off svalues.  To
track these down I added wrapper functions that verify that the
types of the results are correct, and in doing so found various
other type-safety issues, which the patch also fixes.

Doing so led to various changes in diagnostics messages due to
more accurate types, but I felt that these changes weren't
desirable.
For example, the warning at CVE-2005-1689-minimal.c line 48
which expects:
  double-'free' of 'inbuf.data'
changed fo
  double-'free' of '(char *)inbuf.data'

So I added stripping of top-level casts where necessary to avoid
cluttering diagnostics.

Finally, the more accurate types led to worse results from
readability_comparator, where e.g. the event message at line 50
of sensitive-1.c regressed from the precise:
  passing sensitive value 'password' in call to 'called_by_test_5' from 'test_5'
to the vaguer:
  calling 'called_by_test_5' from 'test_5'
This was due to erroneously picking the initial value of "password"
in the caller frame as the best value within the *callee* frame, due to
"char *" vs "const char *", which confuses the logic for tracking values
that pass along callgraph edges.  The patch fixes this by combining the
readability tests for tree and stack depth, rather than performing
them in sequence, so that it favors the value in the deepest frame.

As noted above, the patch fixes the ICEs, but does not fix the
leak false positives.

gcc/analyzer/ChangeLog:
PR analyzer/98969
* engine.cc (readability): Add names for the various arbitrary
values.  Handle NOP_EXPR and INTEGER_CST.
(readability_comparator): Combine the readability tests for
tree and stack depth, rather than performing them sequentially.
(impl_region_model_context::on_state_leak): Strip off top-level
casts.
* region-model.cc (region_model::get_representative_path_var): Add
type-checking, moving the bulk of the implementation to...
(region_model::get_representative_path_var_1): ...here.  Respect
types in casts by recursing and re-adding the cast, rather than
merely stripping them off.  Use the correct type when handling
region_svalue.
(region_model::get_representative_tree): Strip off any top-level
cast.
(region_model::get_representative_path_var): Add type-checking,
moving the bulk of the implementation to...
(region_model::get_representative_path_var_1): ...here.
* region-model.h (region_model::get_representative_path_var_1):
New decl
(region_model::get_representative_path_var_1): New decl.
* store.cc (append_pathvar_with_type): New.
(binding_cluster::get_representative_path_vars): Cast path_vars
to the correct type when adding them to *OUT_PVS.

gcc/testsuite/ChangeLog:
PR analyzer/98969
* g++.dg/analyzer/pr99064.C: New test.
* gcc.dg/analyzer/pr98969.c: New test.

3 years agoDaily bump.
GCC Administrator [Fri, 12 Feb 2021 00:16:25 +0000 (00:16 +0000)]
Daily bump.

3 years agoFix -freorder-blocks-and-partition glitch with Windows SEH
Eric Botcazou [Thu, 11 Feb 2021 23:16:49 +0000 (00:16 +0100)]
Fix -freorder-blocks-and-partition glitch with Windows SEH

Since GCC 8, the -freorder-blocks-and-partition pass can split a function
into hot and cold parts, thus generating 2 CIEs for a single function in
DWARF for exception purposes and doing an equivalent trick for Windows SEH.

Now the Windows system unwinder is picky when it comes to the boundary
between an active EH region and the end of the function and, therefore,
a nop may need to be added in specific cases.

gcc/
* config/i386/winnt.c (i386_pe_seh_unwind_emit): When switching to
the cold section, emit a nop before the directive if the previous
active instruction can throw.

3 years agolibgomp/i386: Revert the type of syscall wrappers output back to long.
Uros Bizjak [Thu, 11 Feb 2021 23:07:56 +0000 (00:07 +0100)]
libgomp/i386: Revert the type of syscall wrappers output back to long.

Linux man-pages 5.07 wrongly declares syscall output type as int.  This error
was fixed in release 5.10, so this patch reverts my recent change.

2021-02-11  Uroš Bizjak  <ubizjak@gmail.com>

libgomp/
* config/linux/x86/futex.h (__futex_wait):
Revert output type back to long.
(__futex_wake): Ditto.
(futex_wait): Update for revert.
(futex_wake): Ditto.

3 years agolibgomp/i386: Move syscall asms to static inline wrapper.
Uros Bizjak [Thu, 11 Feb 2021 21:48:47 +0000 (22:48 +0100)]
libgomp/i386: Move syscall asms to static inline wrapper.

Move syscall asms to static inline wrapper functions to improve #ifdeffery.
Also correct output type to int and timeout type to void *.

2021-02-11  Uroš Bizjak  <ubizjak@gmail.com>

libgomp/
* config/linux/x86/futex.h (__futex_wait): New static inline
wrapper function.  Correct output type to int and
timeout type to void *.
(__futex_wake): New static inline wrapper function.
Correct output type to int.
(futex_wait): Use __futex_wait.
(futex_wake): Use __futex_wake.

3 years agoc++: Endless loop with targ deduction in member tmpl [PR95888]
Marek Polacek [Tue, 9 Feb 2021 20:17:48 +0000 (15:17 -0500)]
c++: Endless loop with targ deduction in member tmpl [PR95888]

My r10-7007 patch tweaked tsubst not to reduce the template level of
template parameters when tf_partial.  That caused infinite looping in
is_specialization_of: we ended up with a class template specialization
whose TREE_TYPE (CLASSTYPE_TI_TEMPLATE (t)) == t, so the second for
loop in is_specialization_of never finished.

There's a lot going on in this test, but essentially: the template fn
here has two template parameters, we call it with one explicitly
provided, the other one has to be deduced.  So we'll find ourselves
in fn_type_unification which uses tf_partial when tsubsting the
*explicit* template arguments into the function type.  That leads to
tsubstituting the return type, C<T>.  C is a member template; its
most general template is

  template<class U> template<class V> struct B<U>::C

we figure out (tsubst_template_args) that the template argument list
is <int, int>.  They come from different levels, one comes from B<int>,
the other one from fn<int>.

So now we lookup_template_class to see if we have C<int, int>.  We
do the
  /* This is a full instantiation of a member template.  Find
     the partial instantiation of which this is an instance.  */
  TREE_VEC_LENGTH (arglist)--;
  // arglist is now <int>, not <int, int>
  found = tsubst (gen_tmpl, arglist, complain, NULL_TREE);
  TREE_VEC_LENGTH (arglist)++;

magic which is looking for the partial instantiation, in this case,
that would be template<class V> struct B<int>::C.  Note we're still
in a tf_partial context!  So the tsubst_template_args in the tsubst
(which tries to substitute <int> into <U, V>) returns <int, V>, but
V's template level hasn't been reduced!  After tsubst_template_args,
tsubst_template_decl looks to see if we already have this specialization:

  // t = template_decl C
  // full_args = <int, V>
  spec = retrieve_specialization (t, full_args, hash);

but doesn't find the one we created a while ago, when processing
B<int> b; in the test, because V's levels don't match.  Whereupon
tsubst_template_decl creates a new TEMPLATE_DECL, one that leads to
the infinite looping problem.

Fixed by using tf_none when looking for an existing partial instantiation.

It also occurred to me that I should be able to trigger a similar
problem with 'auto', since r10-7007 removed an is_auto check.  And lo,
I constructed deduce10.C which exhibits the same issue with pre-r10-7007
compilers.  This patch fixes that problem as well.  I'm ecstatic.

gcc/cp/ChangeLog:

PR c++/95888
* pt.c (lookup_template_class_1): Pass tf_none to tsubst when looking
for the partial instantiation.

gcc/testsuite/ChangeLog:

PR c++/95888
* g++.dg/template/deduce10.C: New test.
* g++.dg/template/deduce9.C: New test.

3 years agors6000: Fix invalid address used in MMA built-in function
Peter Bergner [Thu, 11 Feb 2021 20:15:26 +0000 (14:15 -0600)]
rs6000: Fix invalid address used in MMA built-in function

The mma_assemble_input_operand predicate is too lenient on the memory
operands it will accept, leading to an ICE when illegitimate addresses
are passed in.  The solution is to only accept memory operands with
addresses that are valid for quad word memory accesses.  The test case
is a minimized test case from the Eigen library.  The creduced test case
is very noisy with respect to warnings, so the test case has added -w to
silence them.

2021-02-11  Peter Bergner  <bergner@linux.ibm.com>

gcc/
PR target/99041
* config/rs6000/predicates.md (mma_assemble_input_operand): Restrict
memory addresses that are legal for quad word accesses.

gcc/testsuite/
PR target/99041
* g++.target/powerpc/pr99041.C: New test.

3 years agolibstdc++: Fix versioned namespace build
Jonathan Wakely [Thu, 11 Feb 2021 16:18:19 +0000 (16:18 +0000)]
libstdc++: Fix versioned namespace build

The recent changes to define various std::exception_ptr functions inline
included a change so that the definitions of those functions would be
omitted for the ABI unstable gnu-versioned-namespace configuration. That
change was incorrect, because the existing functions that are gated by
the _GLIBCXX_EH_PTR_COMPAT macro are always needed even for the
versioned namespace.

This change introduces a new macro to control whether operator== is
defined as deleted or not, distinct from the existing macro. The new
macro is not defined for versioned namespace builds, but the old macro
still is.

libstdc++-v3/ChangeLog:

* libsupc++/eh_ptr.cc (_GLIBCXX_EH_PTR_RELOPS_COMPAT): Define
new macro.
* libsupc++/exception_ptr.h (_GLIBCXX_EH_PTR_USED): Check new
macro instead of _GLIBCXX_EH_PTR_COMPAT.
(operator==): Likewise.

3 years agolibstdc++: Document when C++11/14/17 support became stable [PR 99058]
Jonathan Wakely [Thu, 11 Feb 2021 15:35:23 +0000 (15:35 +0000)]
libstdc++: Document when C++11/14/17 support became stable [PR 99058]

libstdc++-v3/ChangeLog:

PR libstdc++/99058
* doc/xml/manual/status_cxx2011.xml: Document when support
became stable.
* doc/xml/manual/status_cxx2014.xml: Likewise.
* doc/xml/manual/status_cxx2017.xml: Likewise.
* doc/html/manual/status.html: Regenerate.

3 years agoc++: Fix zero initialization of flexible array members [PR99033]
Jakub Jelinek [Thu, 11 Feb 2021 16:24:17 +0000 (17:24 +0100)]
c++: Fix zero initialization of flexible array members [PR99033]

array_type_nelts returns error_mark_node for type of flexible array members
and build_zero_init_1 was placing an error_mark_node into the CONSTRUCTOR,
on which e.g. varasm ICEs.  I think there is nothing erroneous on zero
initialization of flexible array members though, such arrays should simply
get no elements, like they do if such classes are constructed (everything
except when some larger initializer comes from an explicit initializer).

So, this patch handles [] arrays in zero initialization like [0] arrays
and fixes handling of the [0] arrays - the
tree_int_cst_equal (max_index, integer_minus_one_node) check
didn't do what it thought it would do, max_index is typically unsigned
integer (sizetype) and so it is never equal to a -1.

What the patch doesn't do and maybe would be desirable is if it returns
error_mark_node for other reasons let the recursive callers not stick that
into CONSTRUCTOR but return error_mark_node instead.  But I don't have a
testcase where that would be needed right now.

2021-02-11  Jakub Jelinek  <jakub@redhat.com>

PR c++/99033
* init.c (build_zero_init_1): Handle zero initialiation of
flexible array members like initialization of [0] arrays.
Use integer_minus_onep instead of comparison to integer_minus_one_node
and integer_zerop instead of comparison against size_zero_node.
Formatting fixes.

* g++.dg/ext/flexary38.C: New test.

3 years agoc++: ICE with unexpanded pack in do-while [PR99063]
Marek Polacek [Thu, 11 Feb 2021 03:51:30 +0000 (22:51 -0500)]
c++: ICE with unexpanded pack in do-while [PR99063]

Here an unexpanded parameter pack snuck into prep_operand which doesn't
expect to see an operand without a type, and since r247842
NONTYPE_ARGUMENT_PACK doesn't have a type anymore.

This only happens with the do-while loop whose condition may not
contain a declaration so we never called finish_cond which checks
for unexpanded parameter packs.  So use check_for_bare_parameter_packs
to remedy that.

gcc/cp/ChangeLog:

PR c++/99063
* semantics.c (finish_do_stmt): Check for unexpanded parameter packs.

gcc/testsuite/ChangeLog:

PR c++/99063
* g++.dg/cpp0x/variadic-crash6.C: New test.

3 years agoc++: Fix ICE from op_unqualified_lookup [PR97582]
Patrick Palka [Thu, 11 Feb 2021 15:59:54 +0000 (10:59 -0500)]
c++: Fix ICE from op_unqualified_lookup [PR97582]

In this testcase, we're crashing because the lookup of operator+ from
within the generic lambda via lookup_name finds multiple bindings
(C1::operator+ and C2::operator+) and returns a TREE_LIST thereof,
something which op_unqualified_lookup (and push_operator_bindings) isn't
prepared to handle.

This patch extends op_unqualified_lookup and push_operator_bindings
to handle such an ambiguous lookup result in the natural way.

gcc/cp/ChangeLog:

PR c++/97582
* name-lookup.c (op_unqualified_lookup): Handle an ambiguous
lookup result by discarding it if the first element is a
class-scope declaration, otherwise return it.
(push_operator_bindings): Handle an ambiguous lookup result by
doing push_local_binding on each element in the list.

gcc/testsuite/ChangeLog:

PR c++/97582
* g++.dg/cpp0x/lambda/lambda-template17.C: New test.

3 years agoarm: Low overhead loop handle long range branches [PR98931]
Andrea Corallo [Wed, 3 Feb 2021 14:21:54 +0000 (15:21 +0100)]
arm: Low overhead loop handle long range branches [PR98931]

gcc/
PR target/98931
* config/arm/thumb2.md (*doloop_end_internal): Generate
alternative sequence to handle long range branches.

gcc/testsuite/
PR target/98931
* gcc.target/arm/pr98931.c: New testcase.

3 years ago[aarch64][vect] Support V8QI->V8HI WIDEN_ patterns
Joel Hutton [Thu, 11 Feb 2021 14:59:26 +0000 (14:59 +0000)]
[aarch64][vect] Support V8QI->V8HI WIDEN_ patterns

In the case where 8 out of every 16 elements are widened using a
widening pattern and the next 8 are skipped, the patterns are not
recognized. This is because they are normally used in a pair, such  as
VEC_WIDEN_MINUS_HI/LO, to achieve a v16qi->v16hi conversion for example.
This patch adds support for V8QI->V8HI patterns.

gcc/ChangeLog:

PR tree-optimization/98772
* optabs-tree.c (supportable_half_widening_operation): New function
to check for supportable V8QI->V8HI widening patterns.
* optabs-tree.h (supportable_half_widening_operation): New function.
* tree-vect-stmts.c (vect_create_half_widening_stmts): New function
to create promotion stmts for V8QI->V8HI widening patterns.
(vectorizable_conversion): Add case for V8QI->V8HI.

gcc/testsuite/ChangeLog:

PR tree-optimization/98772
* gcc.target/aarch64/pr98772.c: New test.

3 years agoFortran: Fix calls to associate name typebound subroutines [PR98897].
Paul Thomas [Thu, 11 Feb 2021 13:24:50 +0000 (13:24 +0000)]
Fortran: Fix calls to associate name typebound subroutines [PR98897].

2021-02-11  Paul Thomas  <pault@gcc.gnu.org>

gcc/fortran
PR fortran/98897
* match.c (gfc_match_call): Include associate names as possible
entities with typebound subroutines. The target needs to be
resolved for the type.

gcc/testsuite/
PR fortran/98897
* gfortran.dg/typebound_call_32.f90: New test.

3 years agoreduce sparseset memory requirement
Richard Biener [Tue, 9 Feb 2021 10:50:23 +0000 (11:50 +0100)]
reduce sparseset memory requirement

Currently we use HOST_WIDEST_FAST_INT for the sparseset element
type which maps to a 64bit type on 64bit hosts.  That's excessive
for the only current sparseset users which are LRA and IRA and
which store register numbers in it which are unsigned int.  The
following changes the sparseset element type to unsigned int.

2021-02-09  Richard Biener  <rguenther@suse.de>

* sparseset.h (SPARSESET_ELT_BITS): Remove.
(SPARSESET_ELT_TYPE): Use unsigned int.
* fwprop.c: Do not include sparseset.h.

3 years agoFortran: Fix ICE after error regression [PR99060].
Paul Thomas [Thu, 11 Feb 2021 10:38:23 +0000 (10:38 +0000)]
Fortran: Fix ICE after error regression [PR99060].

2021-02-11  Paul Thomas  <pault@gcc.gnu.org>

gcc/fortran
PR fortran/99060
* primary.c (gfc_match_varspec): Test for non-null 'previous'
before using its name in the error message.

gcc/testsuite/
PR fortran/99060
* gfortran.dg/pr99060.f90: New test.

3 years agoFortran: intrinsic.texi add missing arg to FINDLOC
Tobias Burnus [Thu, 11 Feb 2021 08:36:23 +0000 (09:36 +0100)]
Fortran: intrinsic.texi add missing arg to FINDLOC

gcc/fortran/ChangeLog:

* intrinsic.texi (FINDLOC): Add 'MASK' to argument table.
(MAXLOC, MAXVAL, MINLOC, MINVAL): For 'MASK', remove 'an
array' as scalars are also permitted.

3 years agouse -mfpu=auto for arm/simd/vmmla_1.c
Alexandre Oliva [Thu, 11 Feb 2021 05:08:06 +0000 (02:08 -0300)]
use -mfpu=auto for arm/simd/vmmla_1.c

On some of our arm targets, we get various -mfpu flags implicitly or
explicitly passed to the compiler during test runs.  The target
options pushed in arm_neon.h that affect vmmlaq_s32 set isa_bit_neon,
but the caller doesn't have that bit set, so arm_can_inline_p rejects
the attempt to inline it, and the test fails.

An explicit -mfpu=neon would address the compile problem, but cause
the assembler to reject the generated code.

So this patch adds -mfpu=auto to the test, overriding any implicit
flags with the fpu implied by the arch.

for  gcc/testsuite/ChangeLog

* gcc.target/arm/simd/vmmla_1.c: Pass -mfpu=auto.

3 years agolibgfortran: Fix unwanted end-of-record by checking if seen_dollar.
Jerry DeLisle [Thu, 11 Feb 2021 03:37:52 +0000 (19:37 -0800)]
libgfortran: Fix unwanted end-of-record by checking if seen_dollar.

libgfortran/ChangeLog:

PR libfortran/98825
* io/transfer.c (next_record_w): Insert check for seen_dollar and if
so, skip issueing next record.

gcc/testsuite/ChangeLog:

PR libfortran/98825
* gfortran.dg/dollar_edit_descriptor_4.f: New test.

3 years agoc, c++: Plug -Wduplicated-cond memory leaks [PR99057]
Marek Polacek [Wed, 10 Feb 2021 17:07:10 +0000 (12:07 -0500)]
c, c++: Plug -Wduplicated-cond memory leaks [PR99057]

Freeing the condition chain needs to use vec_free which does ->release,
or we leak memory.

gcc/c/ChangeLog:

* c-parser.c (c_parser_if_statement): Use vec_free.

gcc/cp/ChangeLog:

* parser.c (cp_parser_selection_statement): Use vec_free.

3 years agoDaily bump.
GCC Administrator [Thu, 11 Feb 2021 00:16:33 +0000 (00:16 +0000)]
Daily bump.

3 years agoAdd test for PR tree-optimization/92879.
Martin Sebor [Wed, 10 Feb 2021 21:42:22 +0000 (14:42 -0700)]
Add test for PR tree-optimization/92879.

gcc/testsuite/ChangeLog:

PR tree-optimization/92879
* g++.dg/warn/Warray-bounds-16.C: New test.

3 years agolibcpp: fix ICE comparing macro locations without column info [PR96391]
David Malcolm [Wed, 10 Feb 2021 19:33:10 +0000 (14:33 -0500)]
libcpp: fix ICE comparing macro locations without column info [PR96391]

PR preprocessor/96391 describes an ICE in the C++ frontend on:

  #define CONST const
  #define VOID void
  typedef CONST VOID *PCVOID;

where the typedef line occurs after enough code has been compiled
that location_t values are beyond LINE_MAP_MAX_LOCATION_WITH_COLS,
and hence no column numbers are available.

The issue occurs in linemap_compare_locations when comparing the
locations of the "const" and "void" tokens.
Upon resolving the LRK_MACRO_EXPANSION_POINT, both have the same
location_t, the line of the "typedef" (with no column), and so
the l0 == l1 clause is triggered, but they are not from the
same macro expansion, leading first_map_in_common to return NULL
and triggering the "abort" condition.

This patch fixes the issue by checking when the two macro expansion
point location_t values are equal that the value
<= LINE_MAP_MAX_LOCATION_WITH_COLS and thus has column information,
fixing the issue.

gcc/testsuite/ChangeLog:
PR preprocessor/96391
* g++.dg/plugin/location-overflow-test-pr96391.c: New test.
* g++.dg/plugin/plugin.exp (plugin_test_list): Add it,
using the location_overflow_plugin.c from gcc.dg/plugin.

libcpp/ChangeLog:
PR preprocessor/96391
* line-map.c (linemap_compare_locations): Require that
the location be <= LINE_MAP_MAX_LOCATION_WITH_COLS when
treating locations as coming from the same macro expansion.

3 years agovarasm: Fix ICE with -fsyntax-only [PR99035]
Jakub Jelinek [Wed, 10 Feb 2021 18:52:37 +0000 (19:52 +0100)]
varasm: Fix ICE with -fsyntax-only [PR99035]

My FE change from 2 years ago uses TREE_ASM_WRITTEN in -fsyntax-only
mode more aggressively to avoid "expanding" functions multiple times.
With -fsyntax-only nothing is really expanded, so I think it is acceptable
to adjust the assert and allow declare_weak at any time, with -fsyntax-only
we know it is during parsing only anyway.

2021-02-10  Jakub Jelinek  <jakub@redhat.com>

PR c++/99035
* varasm.c (declare_weak): For -fsyntax-only, allow even
TREE_ASM_WRITTEN function decls.

* g++.dg/ext/weak6.C: New test.

3 years agoi386: Fix ICEs due to simplify_gen_subreg returning NULL [PR99025]
Jakub Jelinek [Wed, 10 Feb 2021 18:50:11 +0000 (19:50 +0100)]
i386: Fix ICEs due to simplify_gen_subreg returning NULL [PR99025]

In these patterns, we call simplify_gen_subreg on the input operand
to create paradoxical subregs that have 2x, 4x or 8x elements as the input
operand.  That works fine if the input operand is a REG, but when it is a
SUBREG, RTL doesn't allow SUBREG of SUBREG and so relies on simplify_subreg
actually simplifying it.  And e.g. if the input operand is a SUBREG that
changes the element mode (floating vs. non-floating) and then combined with
a paradoxical subreg (i.e. different size) this can easily fail, then
simplify_gen_subreg returns NULL but we still use it in instructions.

Fixed by forcing the operands into REG.

2021-02-10  Jakub Jelinek  <jakub@redhat.com>

PR target/99025
* config/i386/sse.md (fix<fixunssuffix>_truncv2sfv2di2,
<insn>v8qiv8hi2, <insn>v8qiv8si2, <insn>v4qiv4si2, <insn>v4hiv4si2,
<insn>v8qiv8di2, <insn>v4qiv4di2, <insn>v2qiv2di2, <insn>v4hiv4di2,
<insn>v2hiv2di2, <insn>v2siv2di2): Force operands[1] into REG before
calling simplify_gen_subreg on it.

* gcc.target/i386/pr99025.c: New test.

3 years agoc++: Consider addresses of heap artificial vars always non-NULL [PR98988, PR99031]
Jakub Jelinek [Wed, 10 Feb 2021 18:31:15 +0000 (19:31 +0100)]
c++: Consider addresses of heap artificial vars always non-NULL [PR98988, PR99031]

With -fno-delete-null-pointer-checks which is e.g. implied by
-fsanitize=undefined or default on some embedded targets, the middle-end
folder doesn't consider addresses of global VAR_DECLs to be non-NULL, as one
of them could have address 0.  Still, I think malloc/operator new (at least
the nonthrowing) relies on NULL returns meaning allocation failure rather
than success.  Furthermore, the artificial VAR_DECLs we create for
constexpr new never actually live in the address space of the program,
so we can pretend they will never be NULL too.

> I'm surprised that nonzero_address has such a limited set of things it will
> actually believe have non-zero addresses with
> -fno-delete-null-pointer-checks.  But it seems that we should be able to
> arrange to satisfy
>
> >   if (definition && !DECL_EXTERNAL (decl)
>
> since these "variables" are indeed defined within the current translation
> unit.

Doing that seems to work and as added benefit it fixes another PR that has
been filed recently.  I need to create the varpool node explicitly and call
a method that sets the definition member in there, but I can also unregister
those varpool nodes at the end of constexpr processing, as the processing
ensured they don't leak outside of the processing.

2021-02-10  Jakub Jelinek  <jakub@redhat.com>

PR c++/98988
PR c++/99031
* constexpr.c: Include cgraph.h.
(cxx_eval_call_expression): Call varpool_node::finalize_decl on
heap artificial vars.
(cxx_eval_outermost_constant_expr): Remove varpool nodes for
heap artificial vars.

* g++.dg/cpp2a/constexpr-new16.C: New test.
* g++.dg/cpp2a/constexpr-new17.C: New test.

3 years agonvptx: properly use flag_patchable_function_entry
Martin Liska [Wed, 10 Feb 2021 13:15:41 +0000 (14:15 +0100)]
nvptx: properly use flag_patchable_function_entry

gcc/ChangeLog:

* config/nvptx/nvptx.c (nvptx_option_override): Use
flag_patchable_function_entry instead of the removed
function_entry_patch_area_size.

3 years agolibstdc++: Re-enable workaround for _wstat64 bug [PR 88881]
Jonathan Wakely [Wed, 10 Feb 2021 16:51:34 +0000 (16:51 +0000)]
libstdc++: Re-enable workaround for _wstat64 bug [PR 88881]

This wasn't fixed upstream for mingw-w64 so we still need the
workaround.

libstdc++-v3/ChangeLog:

PR libstdc++/88881
* src/c++17/fs_ops.cc (fs::status): Re-enable workaround.

3 years agolibstdc++: Use correct error category for Windows error codes
Jonathan Wakely [Wed, 10 Feb 2021 16:45:38 +0000 (16:45 +0000)]
libstdc++: Use correct error category for Windows error codes

When the result of GetLastError() is stored in a std::error_code it
should use std::system_category(), not std::generic_category() that is
used for POSIX errno values.

libstdc++-v3/ChangeLog:

* src/c++17/fs_ops.cc (fs::create_hard_link, fs::equivalent)
(fs::remove): Use std::system_category() for error codes from
GetLastError().
* src/filesystem/ops.cc (fs::create_hard_link, fs::remove):
Likewise.

3 years agolibstdc++: Fix spelling of __MINGW32__ macros
Jonathan Wakely [Wed, 10 Feb 2021 16:37:39 +0000 (16:37 +0000)]
libstdc++: Fix spelling of __MINGW32__ macros

libstdc++-v3/ChangeLog:

* testsuite/27_io/filesystem/operations/proximate.cc: Fix typo
in __MINGW32__ macro name.
* testsuite/27_io/filesystem/path/compare/lwg2936.cc: Likewise.
* testsuite/27_io/filesystem/path/generation/proximate.cc:
Likewise.
* testsuite/27_io/filesystem/path/generation/relative.cc:
Likewise.
* testsuite/util/testsuite_fs.h: Likewise.

3 years agofix memory leak in optimize pragma parsing
Richard Biener [Wed, 10 Feb 2021 10:28:30 +0000 (11:28 +0100)]
fix memory leak in optimize pragma parsing

The optimize pragma/attribute parsing calls decode_cmdline_options_to_array
but doesn't free the array.  The following fixes that.

2021-02-10  Richard Biener  <rguenther@suse.de>

gcc/c-family/
* c-common.c (parse_optimize_options): Free decoded_options.

3 years agoc++: generic lambdas and local-externs from outer scopes [PR 99030]
Nathan Sidwell [Wed, 10 Feb 2021 13:29:39 +0000 (05:29 -0800)]
c++: generic lambdas and local-externs from outer scopes [PR 99030]

Lambdas can refer to local externs from their enclosing scope.  When
the lambda's generic but the containing function is not a temploid,
we'll never have tsubsted the declaring decl so won't have a local
specialization.  But in that case we can just use the decl we
tsubsting directly -- it's not dependent.

PR c++/99030
gcc/cp
* pt.c (tsubst_copy) [VAR_DECL]: For a DECL_LOCAL_DECL_P T is the
answer if there's no local specialization.
gcc/testsuite/
* g++.dg/lookup/pr99030.C: New.

3 years agoif-to-switch: fix memory leak in case merging
Martin Liska [Wed, 10 Feb 2021 08:39:54 +0000 (09:39 +0100)]
if-to-switch: fix memory leak in case merging

gcc/ChangeLog:

PR tree-optimization/99002
PR tree-optimization/99026
* gimple-if-to-switch.cc (if_chain::is_beneficial): Fix memory
leak when adjacent cases are merged.
* tree-switch-conversion.c (switch_decision_tree::analyze_switch_statement): Use
release_clusters.
(make_pass_lower_switch): Remove trailing whitespace.
* tree-switch-conversion.h (release_clusters): New.

3 years agortl-optimization/99054 - fix leak in fixup_partitions
Richard Biener [Wed, 10 Feb 2021 09:17:15 +0000 (10:17 +0100)]
rtl-optimization/99054 - fix leak in fixup_partitions

This fixes a leak of the vector retured by find_partition_fixes
by turning it into an auto_vec.

2021-02-10  Richard Biener  <rguenther@suse.de>

PR rtl-optimization/99054
* cfgrtl.c (rtl-optimization/99054): Return an auto_vec.
(fixup_partitions): Adjust.
(rtl_verify_edges): Likewise.

3 years agoopenmp: Temporarily disable into_ssa when gimplifying OpenMP reduction clauses [PR99007]
Jakub Jelinek [Wed, 10 Feb 2021 09:34:58 +0000 (10:34 +0100)]
openmp: Temporarily disable into_ssa when gimplifying OpenMP reduction clauses [PR99007]

gimplify_scan_omp_clauses was already calling gimplify_expr with false as
last argument to make sure it is not an SSA_NAME, but as the testcases show,
that is not enough, SSA_NAME temporaries created during that gimplification
can be reused too and we can't allow SSA_NAMEs to be used across OpenMP
region boundaries, as we can only firstprivatize decls.

Fixed by temporarily disabling into_ssa.

2021-02-10  Jakub Jelinek  <jakub@redhat.com>

PR middle-end/99007
* gimplify.c (gimplify_scan_omp_clauses): For MEM_REF on reductions,
temporarily disable gimplify_ctxp->into_ssa around gimplify_expr
calls.

* g++.dg/gomp/pr99007.C: New test.
* gcc.dg/gomp/pr99007-1.c: New test.
* gcc.dg/gomp/pr99007-2.c: New test.
* gcc.dg/gomp/pr99007-3.c: New test.

3 years agoipa/99029 - fix memory leak in propagate_malloc
Richard Biener [Wed, 10 Feb 2021 08:13:01 +0000 (09:13 +0100)]
ipa/99029 - fix memory leak in propagate_malloc

This makes sure to release the vec<> of callees.

2021-02-10  Richard Biener  <rguenther@suse.de>

PR ipa/99029
* ipa-pure-const.c (propagate_malloc): Use an auto_vec<>
for callees.

3 years agotree-optimization/99024 - fix leak in loop vect analysis
Richard Biener [Wed, 10 Feb 2021 08:06:26 +0000 (09:06 +0100)]
tree-optimization/99024 - fix leak in loop vect analysis

When we analyzed a loop as epilogue but later in peeling decide
we're not going to use it then in the DTOR we clear the original
loops ->aux which causes us to leak the main loop vinfo.

Fixed by only clearing aux if it is associated with the vinfo
we're destroying.

2021-02-10  Richard Biener  <rguenther@suse.de>

PR tree-optimization/99024
* tree-vect-loop.c (_loop_vec_info::~_loop_vec_info): Only
clear loop->aux if it is associated with the destroyed loop_vinfo.

3 years agoif-to-switch: fix a memory leak
Martin Liska [Tue, 9 Feb 2021 08:50:04 +0000 (09:50 +0100)]
if-to-switch: fix a memory leak

gcc/ChangeLog:

PR tree-optimization/99002
* gimple-if-to-switch.cc (find_conditions): Fix memory leak
in the function.

3 years agoICF: fix memory leak
Martin Liska [Tue, 9 Feb 2021 08:57:04 +0000 (09:57 +0100)]
ICF: fix memory leak

gcc/ChangeLog:

PR ipa/99003
* ipa-icf.c (sem_item::add_reference): Fix memory leak when
a reference exists.

3 years agodwarf2out: Don't prune static data members initialized with constants with -gdwarf...
Jakub Jelinek [Wed, 10 Feb 2021 06:54:30 +0000 (07:54 +0100)]
dwarf2out: Don't prune static data members initialized with constants with -gdwarf-5 [PR98755]

In DWARF4 and earlier, static data members were represented as DW_TAG_member and the
pruning code wouldn't prune those, but in DWARF5 they are represented as DW_TAG_variable
with the class parent and the pruning code prunes those by default unless they are
referenced from a separate definition without the class parent (out of class definition).
C++17 inline vars have the definitions in the class though and even before if the static
data member isn't ODR used, it doesn't need to be defined, so we could just never describe
those static data members in the debug info.

This change stops the pruning of DW_TAG_variable with DW_AT_const_value attribute
with a class parent for -gdwarf-5 and later.

This fixes
-FAIL: g++.dg/debug/dwarf2/constexpr-var-1.C   scan-assembler-times  DW_AT_const_expr 2
-FAIL: libstdc++-prettyprinters/80276.cc whatis p4
-FAIL: libstdc++-prettyprinters/80276.cc whatis p4
-FAIL: libstdc++-prettyprinters/libfundts.cc print as
-FAIL: libstdc++-prettyprinters/libfundts.cc print as
-FAIL: libstdc++-prettyprinters/libfundts.cc print os
-FAIL: libstdc++-prettyprinters/libfundts.cc print os

2021-02-10  Jakub Jelinek  <jakub@redhat.com>

PR debug/98755
* dwarf2out.c (prune_unused_types_walk): Mark DW_TAG_variable DIEs
at class scope for DWARF5+.

3 years agoopenacc: Add XFAILs [PR98979]
Julian Brown [Tue, 9 Feb 2021 20:00:14 +0000 (12:00 -0800)]
openacc: Add XFAILs [PR98979]

This patch adds some XFAILs for PR98979 until the patch to fix them has
been approved. See:

  https://gcc.gnu.org/pipermail/gcc-patches/2021-February/564711.html

gcc/testsuite/
PR fortran/98979
* gfortran.dg/goacc/array-with-dt-2.f90: Add expected errors.
* gfortran.dg/goacc/derived-chartypes-1.f90: Skip ICEing test.
* gfortran.dg/goacc/derived-chartypes-2.f90: Likewise.

libgomp/
PR fortran/98979
* testsuite/libgomp.oacc-fortran/array-stride-dt-1.f90: Add expected
errors.

3 years agoRevert "openacc: Allow strided arrays in update directives"
Julian Brown [Tue, 9 Feb 2021 22:09:00 +0000 (14:09 -0800)]
Revert "openacc: Allow strided arrays in update directives"

This patch reverts the non-testsuite parts of commit
9a4d32f85ccebc0ee4b24e6d9d7a4f11c04d7146 which cause ICEs without the
yet-to-be-approved patch here:

  https://gcc.gnu.org/pipermail/gcc-patches/2021-February/564711.html

gcc/fortran/

PR fortran/98979
* openmp.c (resolve_omp_clauses): Omit OpenACC update in
contiguity check and stride-specified error.

3 years agoDaily bump.
GCC Administrator [Wed, 10 Feb 2021 00:16:39 +0000 (00:16 +0000)]
Daily bump.

3 years agolibstdc++: Add unordered containers heterogeneous lookup
François Dumont [Mon, 30 Nov 2020 19:57:16 +0000 (20:57 +0100)]
libstdc++: Add unordered containers heterogeneous lookup

Add unordered containers heterogeneous lookup member functions find, count, contains and
equal_range in C++20. Those members are considered for overload resolution only if hash and
equal functors used to instantiate the container have a nested is_transparent type.

libstdc++-v3/ChangeLog:

* include/bits/stl_tree.h
(__has_is_transparent, __has_is_transparent_t): Move...
* include/bits/stl_function.h: ...here.
* include/bits/hashtable_policy.h (_Hash_code_base<>::_M_hash_code_tr): New..
(_Hashtable_base<>::_M_equals_tr): New.
* include/bits/hashtable.h (_Hashtable<>::_M_find_tr, _Hashtable<>::_M_count_tr,
_Hashtable<>::_M_equal_range_tr): New member function templates to perform
heterogeneous lookup.
(_Hashtable<>::_M_find_before_node_tr): New.
(_Hashtable<>::_M_find_node_tr): New.
* include/bits/unordered_map.h (unordered_map::find<>, unordered_map::count<>,
unordered_map::contains<>, unordered_map::equal_range<>): New member function
templates to perform heterogeneous lookup.
(unordered_multimap::find<>, unordered_multimap::count<>,
unordered_multimap::contains<>, unordered_multimap::equal_range<>): Likewise.
* include/bits/unordered_set.h  (unordered_set::find<>, unordered_set::count<>,
unordered_set::contains<>, unordered_set::equal_range<>): Likewise.
(unordered_multiset::find<>, unordered_multiset::count<>,
unordered_multiset::contains<>, unordered_multiset::equal_range<>): Likewise.
* include/debug/unordered_map
(unordered_map::find<>, unordered_map::equal_range<>): Likewise.
(unordered_multimap::find<>, unordered_multimap::equal_range<>): Likewise.
* include/debug/unordered_set
(unordered_set::find<>, unordered_set::equal_range<>): Likewise.
(unordered_multiset::find<>, unordered_multiset::equal_range<>): Likewise.
* testsuite/23_containers/unordered_map/operations/1.cc: New test.
* testsuite/23_containers/unordered_multimap/operations/1.cc: New test.
* testsuite/23_containers/unordered_multiset/operations/1.cc: New test.
* testsuite/23_containers/unordered_set/operations/1.cc: New test.

3 years agolibstdc++: Remove execution branch in deque iterator operator-
François Dumont [Thu, 4 Feb 2021 05:45:18 +0000 (06:45 +0100)]
libstdc++: Remove execution branch in deque iterator operator-

libstdc++-v3/ChangeLog:

* include/bits/stl_deque.h
(std::operator-(deque::iterator, deque::iterator)): Replace if/then with
a null pointer test.

3 years agoanalyzer: support "_IO_"-prefixed variants of FILE * fns [PR98575]
David Malcolm [Tue, 9 Feb 2021 20:54:14 +0000 (15:54 -0500)]
analyzer: support "_IO_"-prefixed variants of FILE * fns [PR98575]

PR analyzer/98575 describes an unexpected -Wanalyzer-malloc-leak false
positive from gcc.dg/analyzer/pr94851-1.c on glibc < 2.28.

The issue is that a getchar call gets inlined into a call to _IO_getc,
and "_IO_getc" is not in the set of FILE * functions the analyzer
"knows about".  This exposes a bug in memory leak detection on code
paths in which an unknown function has been called.

The memory leak bug is fixed in the prior commit, but for good
measure this patch special-cases the "_IO_"-prefixed names in glibc
so that the analyzer can reuse its knowledge about the unprefixed
variants.

gcc/analyzer/ChangeLog:
PR analyzer/98575
* sm-file.cc (is_file_using_fn_p): Support "_IO_"-prefixed
variants.

gcc/testsuite/ChangeLog:
PR analyzer/98575
* gcc.dg/analyzer/file-1.c (test_5): New.
* gcc.dg/analyzer/file-3.c: New test.

3 years agoanalyzer: treat pointers written to *UNKNOWN as escaping [PR98575]
David Malcolm [Tue, 9 Feb 2021 20:53:01 +0000 (15:53 -0500)]
analyzer: treat pointers written to *UNKNOWN as escaping [PR98575]

PR analyzer/98575 describes an unexpected -Wanalyzer-malloc-leak false
positive from gcc.dg/analyzer/pr94851-1.c on glibc < 2.28.

The issue is that a getchar call gets inlined into a call to _IO_getc,
and "_IO_getc" is not in the set of FILE * functions the analyzer
"knows about".  This leads to a global pointer
  struct buf *curbp;
being treated as UNKNOWN after the call to _IO_getc.  Later when a
malloced pointer is written to curbp->b_amark, the write is discarded
(since curbp is unknown) without noting that the pointer has escaped,
and so the pointer is erroneously treated as leaking when the function
returns.

This patch updates the handling of *UNKNOWN to treat pointers written
to them as having escaped, fixing the false positive.

The patch stops the leak warning in gcc.dg/analyzer/explode-1.c.
After merging states at the join-point after the first switch, pp has
UNKNOWN value, and so *pp is a write through UNKNOWN, which with this
patch is now treated as escaping - despite the fact that all possible
values for *pp are on the stack.  There doesn't seem to be a good way
to fix this, and the testcase is an artifically constructed one, so the
patch simply removes the dg-warning directive.

gcc/analyzer/ChangeLog:
PR analyzer/98575
* store.cc (store::set_value): Treat a pointer written to *UNKNOWN
as having escaped.

gcc/testsuite/ChangeLog:
PR analyzer/98575
* gcc.dg/analyzer/explode-1.c: Remove expected leak warning.
* gcc.dg/analyzer/pr94851-2.c: New test.
* gcc.dg/analyzer/pr98575-1.c: New test.

3 years agoFix miscompilation of Python on HP-PA/Linux
Eric Botcazou [Tue, 9 Feb 2021 18:49:18 +0000 (19:49 +0100)]
Fix miscompilation of Python on HP-PA/Linux

This is the miscompilation of Python at -O2 on HP-PA/Linux present
on the mainline and 10 branch, caused by the presence of a call to
__builtin_unreachable () in the middle of a heavily branchy code,
which confuses the reorg pass.

gcc/
PR rtl-optimization/96015
* reorg.c (skip_consecutive_labels): Minor comment tweaks.
(relax_delay_slots): When deleting a jump to the next active
instruction over a barrier, first delete the barrier if the
jump is the only way to reach the target label.

3 years agoaarch64: fix vector multiplication costs
Andre Vieira [Tue, 9 Feb 2021 18:09:19 +0000 (18:09 +0000)]
aarch64: fix vector multiplication costs

This patch introduces a vect.mul RTX cost and decouples the vector
multiplication costing from the scalar one.

gcc/ChangeLog:
2021-02-09  Andre Vieira  <andre.simoesdiasvieira@arm.com>

* config/aarch64/aarch64-cost-tables.h: Add entries for vect.mul.
* config/aarch64/aarch64.c (aarch64_rtx_mult_cost): Use vect.mul for
vector multiplies and vect.alu for SSRA.
* config/arm/aarch-common-protos.h (struct vector_cost_table): Define
vect.mul cost field.
* config/arm/aarch-cost-tables.h: Add entries for vect.mul.
* config/arm/arm.c: Likewise.

gcc/testsuite/ChangeLog:
2021-02-09  Andre Vieira  <andre.simoesdiasvieira@arm.com>

* gcc.target/aarch64/asimd-mul-to-shl-sub.c: New test.

3 years agotestsuite: aarch64: Add tests for vpaddq intrinsics
Jonathan Wright [Tue, 9 Feb 2021 15:35:16 +0000 (15:35 +0000)]
testsuite: aarch64: Add tests for vpaddq intrinsics

Add tests for vpaddq_* Neon intrinsics. Since these intrinsics are
only supported for AArch64, these tests are restricted to only run on
AArch64 targets.

gcc/testsuite/ChangeLog:

2021-02-09  Jonathan Wright  <jonathan.wright@arm.com>

* gcc.target/aarch64/advsimd-intrinsics/vpXXXq.inc:
New test template.
* gcc.target/aarch64/advsimd-intrinsics/vpaddq.c: New test.

3 years agolibstdc++: Clear up directories created by tests
Jonathan Wakely [Tue, 9 Feb 2021 16:53:56 +0000 (16:53 +0000)]
libstdc++: Clear up directories created by tests

libstdc++-v3/ChangeLog:

* testsuite/27_io/filesystem/operations/remove_all.cc: Remove
test directory after making it writable again.
* testsuite/experimental/filesystem/operations/remove_all.cc:
Likewise.

3 years agoc++: Fix indirect partitions [PR 98944]
Nathan Sidwell [Tue, 9 Feb 2021 16:11:58 +0000 (08:11 -0800)]
c++: Fix indirect partitions [PR 98944]

The most recent reimplementation of module loading initialization
changed the behaviour of setting an import's location, and broke some
partition handling.

PR c++/98944
gcc/cp/
* module.cc (module_state::is_rooted): Rename to ...
(module_state::has_location): ... here.  Adjust callers.
(module_state::read_partitions): Adjust validity check.
Don't overwrite a known location.
gcc/testsuite/
* g++.dg/modules/pr98944_a.C: New.
* g++.dg/modules/pr98944_b.C: New.
* g++.dg/modules/pr98944_c.C: New.
* g++.dg/modules/pr98944_d.C: New.

3 years agolibstdc++: Make coroutine_handle<_Promise>::from_address() noexcept [PR 99021]
Jonathan Wakely [Tue, 9 Feb 2021 11:23:29 +0000 (11:23 +0000)]
libstdc++: Make coroutine_handle<_Promise>::from_address() noexcept [PR 99021]

The coroutine_handle<void>::from_address(void*) version is already
noexcept, and they do the same thing. Make them consistent.

libstdc++-v3/ChangeLog:

PR libstdc++/99021
* include/std/coroutine (coroutine_handle<P>::from_address): Add
noexcept.

3 years agolibstdc++: Fix build failure for targets without unistd.h
Vladimir Vishnevsky [Tue, 9 Feb 2021 10:25:38 +0000 (10:25 +0000)]
libstdc++: Fix build failure for targets without unistd.h

The patch fixes build issues occurring if build parameter
"--enable-cstdio=stdio_pure" is specified and no unistd.h is
present in the environment.

libstdc++-v3/ChangeLog:

* include/ext/stdio_sync_filebuf.h: Remove unused <unistd.h>.
* src/c++17/fs_ops.cc (fs::permissions): Qualify mode_t.

3 years agoFix O(region-size) unwind in VN
Richard Biener [Tue, 9 Feb 2021 10:59:06 +0000 (11:59 +0100)]
Fix O(region-size) unwind in VN

This fixes the currently O(region-size) unwinding of avail info
to be O(unwind-size) by tracking a linked-list stack of pushed
avails.  This reduces the compile-time spent in complete unrolling
for WRF.

2021-02-09  Richard Biener  <rguenther@suse.de>

PR tree-optimization/98863
* tree-ssa-sccvn.h (vn_avail::next_undo): Add.
* tree-ssa-sccvn.c (last_pushed_avail): New global.
(rpo_elim::eliminate_push_avail): Chain pushed avails.
(unwind_state::avail_top): Add.
(do_unwind): Rewrite unwinding of avail entries.
(do_rpo_vn): Initialize last_pushed_avail and
avail_top of the undo state.

3 years agostring: Add a workaround for -Wstringop-overread false positives [PR98465]
Jakub Jelinek [Tue, 9 Feb 2021 11:32:43 +0000 (12:32 +0100)]
string: Add a workaround for -Wstringop-overread false positives [PR98465]

In the PR there are several possibilities how to improve _M_disjunct at
least in certain cases so that the compiler can figure out at least in some
cases where __s is provably disjunct from _M_data() ... _M_data() + this->size()
but it is probably GCC 12 material.

The false positive warning is on this particular copy, which is done for
non-disjunct pointers when __len2 > __len1 and the __s >= __p + __len1,
i.e. __s used to point to the characters moved through _S_move a few lines earlier
by __len2 - __len1 characters up to make space.  That is why the
_S_copy source is __s + __len2 - __len1.  Unfortunately, when the compiler
can't prove objects are disjunct, that copying from __s + __len2 - __len1
of __len2 characters can very well mean accessing characters the source
object (if it is not disjunct) provably can't have.

The following patch works around that by making the _S_copy be a __p based
pointer instead of __s based pointer.
__s + __len2 - __len1
and
__p + (__s - __p) + (__len2 - __len1)
have the same value and the latter may seem to be uselessly longer,
but it seems at least currently in GIMPLE we keep it that way and so that is
what the warning code during expansion will see, and only actually
optimize it to __s + __len2 - __len1 during RTL when we lose information
on what is a pointer and what is a mere offset with the same mode.

So, in the end we emit exactly the same assembly, just without the false
positive warning.

2021-02-09  Jakub Jelinek  <jakub@redhat.com>

PR middle-end/98465
* include/bits/basic_string.tcc (basic_string::_M_replace): When __s
points to the characters moved by earlier _S_move, compute the source
address using expression based on the __p pointer rather than __s
pointer.

* g++.dg/warn/Wstringop-overread-1.C: New test.

3 years agocalls: Fix a memory leak in maybe_warn_rdwr_sizes [PR99004]
Jakub Jelinek [Tue, 9 Feb 2021 11:29:32 +0000 (12:29 +0100)]
calls: Fix a memory leak in maybe_warn_rdwr_sizes [PR99004]

The print_generic_expr_to_str function ends with
return xstrdup (...); and therefore expects the caller to free
the argument.

The following patch does that after it has been copied.
Instead of doing const_cast to cast away const char * to char *,
because the code uses s0 and s1 in so few places, I chose just
to change the types of the two variables so that const_cast
is not needed.  After all, it is a heap allocated string that
this function owns and so if it wanted, it could change it too.

2021-02-09  Jakub Jelinek  <jakub@redhat.com>

PR middle-end/99004
* calls.c (maybe_warn_rdwr_sizes): Change s0 and s1 type from
const char * to char * and free those pointers after use.

3 years agotree-optimization/99017 - be more forgiving in BB vect costing
Richard Biener [Tue, 9 Feb 2021 09:11:35 +0000 (10:11 +0100)]
tree-optimization/99017 - be more forgiving in BB vect costing

This works around a SLP graph partitioning or cost collecting issue
by being more forgiving in vect_bb_vectorization_profitable_p.

2021-02-09  Richard Biener  <rguenther@suse.de>

PR tree-optimization/99017
* tree-vect-slp.c (vect_bb_vectorization_profitable_p): Allow
zero vector cost entries.

3 years agoc++: consteval and explicit instantiation [PR96905]
Jason Merrill [Mon, 8 Feb 2021 22:16:14 +0000 (17:16 -0500)]
c++: consteval and explicit instantiation [PR96905]

Normally, an explicit instantiation means we want to write out the
instantiation.  But not for a consteval function.

gcc/cp/ChangeLog:

PR c++/96905
* pt.c (mark_decl_instantiated): Exit early if consteval.

gcc/testsuite/ChangeLog:

PR c++/96905
* g++.dg/cpp2a/consteval-expinst1.C: New test.

3 years agoc++: generic lambda, fn* conv, empty class [PR98326]
Jason Merrill [Mon, 8 Feb 2021 22:04:03 +0000 (17:04 -0500)]
c++: generic lambda, fn* conv, empty class [PR98326]

Here, in the thunk returned from the captureless lambda conversion to
pointer-to-function, we try to pass through invisible reference parameters
by reference, without doing a copy.  The empty class copy optimization was
messing that up.

gcc/cp/ChangeLog:

PR c++/98326
PR c++/20408
* cp-gimplify.c (simple_empty_class_p): Don't touch an invisiref
parm.

gcc/testsuite/ChangeLog:

PR c++/98326
* g++.dg/cpp1y/lambda-generic-empty1.C: New test.

3 years agoc++: constexpr, union, and no_unique_address [PR98994]
Jason Merrill [Mon, 8 Feb 2021 20:56:11 +0000 (15:56 -0500)]
c++: constexpr, union, and no_unique_address [PR98994]

My second patch for 97566 omits nested CONSTRUCTORs for empty fields, but we
do want them for empty union members.

gcc/cp/ChangeLog:

PR c++/98994
PR c++/97566
* constexpr.c (cxx_eval_store_expression): Only skip empty fields in
RECORD_TYPE.

gcc/testsuite/ChangeLog:

PR c++/98994
* g++.dg/cpp2a/no_unique_address12.C: New test.

3 years agoDaily bump.
GCC Administrator [Tue, 9 Feb 2021 00:16:30 +0000 (00:16 +0000)]
Daily bump.

3 years agoc++: cleanup function name [PR 98531]
Nathan Sidwell [Wed, 3 Feb 2021 12:44:41 +0000 (04:44 -0800)]
c++: cleanup function name [PR 98531]

The next piece of 98531 is that in some cases we need to create a
cleanup function to do the work (when the object is an array, or we're
using regular atexit).  We were not pushing that function's decl
anywhere (not giving it a context) so streaming it failed.

This is a partial fix.  You'll notice we're naming these from a per-TU
counter.  I've captured that in PR98893.

gcc/cp/
* decl.c (start_cleanup_fn): Push function into
namespace.
gcc/testsuite/
* g++.dg/modules/pr98531-2.h: New.
* g++.dg/modules/pr98531-2_a.H: New.
* g++.dg/modules/pr98531-2_b.C: New.
* g++.dg/modules/pr98531-3.h: New.
* g++.dg/modules/pr98531-3_a.H: New.
* g++.dg/modules/pr98531-3_b.C: New.

3 years agoc++: cross-module __cxa_atexit use [PR 98531]
Nathan Sidwell [Fri, 22 Jan 2021 16:48:27 +0000 (08:48 -0800)]
c++: cross-module __cxa_atexit use [PR 98531]

The compiler's use of lazily-declared library functions must insert
said functions into a symbol table, so that they can be correctly
merged across TUs at the module-level.  We have too many different
ways of declaring such library functions.  This fixes __cxa_atexit (or
its system-specific variations), pushing (or merging) the decl into
the appropriate namespace.  Because we're pushing a lazy builtin,
check_redeclaration_exception_specification needed a tweak to allow a
such a builtin's eh spec to differ from what the user may have already
declared. (I suspect no all headers declare atexit as noexcept.)

We can't test the -fno-use-cxa-atexit path with modules, as that
requires a followup patch to a closely related piece (which also
affects cxa_atexit targets in other circumstances).

PR c++/98531
gcc/cp/
* cp-tree.h (push_abi_namespace, pop_abi_namespace): Declare.
* decl.c (push_abi_namespace, pop_abi_namespace): Moved
from rtti.c, add default namespace arg.
(check_redeclaration_exception_specification): Allow a lazy
builtin's eh spec to differ from an lready-declared user
declaration.
(declare_global_var): Use push/pop_abi_namespace.
(get_atexit_node): Push the fndecl into a namespace.
* rtti.c (push_abi_namespace, pop_abi_namespace): Moved to
decl.c.
gcc/testsuite/
* g++.dg/modules/pr98531-1.h: New.
* g++.dg/modules/pr98531-1_a.H: New.
* g++.dg/modules/pr98531-1_b.C: New.
* g++.dg/abi/pr98531-1.C: New.
* g++.dg/abi/pr98531-2.C: New.
* g++.dg/abi/pr98531-3.C: New.
* g++.dg/abi/pr98531-4.C: New.

3 years agomklog: automatically fill in generated entries
Mike Frysinger [Sun, 7 Feb 2021 20:17:47 +0000 (15:17 -0500)]
mklog: automatically fill in generated entries

contrib/ChangeLog:

* mklog.py (generated_files): New set.
(generate_changelog): Add entries based on generated_files.

3 years agoc++: Fix typo in CLASSTYPE_TI_TEMPLATE comment.
Marek Polacek [Mon, 8 Feb 2021 16:34:54 +0000 (11:34 -0500)]
c++: Fix typo in CLASSTYPE_TI_TEMPLATE comment.

gcc/cp/ChangeLog:

* cp-tree.h (CLASSTYPE_TI_TEMPLATE): Fix typo.

3 years agomiddle-end/98974 - fixup after STMT_VINFO_VEC_STMTS rework
Andre Vieira [Mon, 8 Feb 2021 16:04:18 +0000 (16:04 +0000)]
middle-end/98974 - fixup after STMT_VINFO_VEC_STMTS rework

This fixes up the nvectors parameter passed to vect_get_loop_mask in
vectorizable_condition after the STMT_VINFO_VEC_STMTS rework.

gcc/ChangeLog:
2021-02-08  Andre Vieira  <andre.simoesdiasvieira@arm.com>

PR middle-end/98974
* tree-vect-stmts.c (vectorizable_condition): Remove shadow vec_num
parameter in vectorizable_condition.

gcc/testsuite/ChangeLog:
2021-02-08  Andre Vieira  <andre.simoesdiasvieira@arm.com>

PR middle-end/98974
* gfortran.dg/pr98974.F90: New test.

3 years agolto/96591 - walk VECTOR_CST elements in walk_tree
Richard Biener [Mon, 8 Feb 2021 08:52:56 +0000 (09:52 +0100)]
lto/96591 - walk VECTOR_CST elements in walk_tree

This implements walking of VECTOR_CST elements in walk_tree, mimicing
the walk of COMPLEX_CST elements.  Without this free-lang-data fails
to see some types in case they are only refered to via tree constants
used only as VECTOR_CST elements.

2021-02-08  Richard Biener  <rguenther@suse.de>

PR lto/96591
* tree.c (walk_tree_1): Walk VECTOR_CST elements.

* g++.dg/lto/pr96591_0.C: New testcase.

3 years agoopts: fix handling of -fpatchable-function-entries option
Martin Liska [Fri, 5 Feb 2021 12:11:44 +0000 (13:11 +0100)]
opts: fix handling of -fpatchable-function-entries option

gcc/ChangeLog:

PR lto/98971
* cfgexpand.c (pass_expand::execute): Parse per-function option
flag_patchable_function_entry and use it.
* common.opt: Remove function_entry_patch_area_size and
function_entry_patch_area_start global variables.
* opts.c (parse_and_check_patch_area): New function.
(common_handle_option): Use it.
* opts.h (parse_and_check_patch_area): New function.
* toplev.c (process_options): Parse and use
function_entry_patch_area_size.

3 years agoCorrect typos in attribute malloc documentation.
Martin Sebor [Mon, 8 Feb 2021 00:21:32 +0000 (17:21 -0700)]
Correct typos in attribute malloc documentation.

gcc/ChangeLog:
* doc/extend.texi (attribute malloc): Correct typos.

3 years agoDaily bump.
GCC Administrator [Mon, 8 Feb 2021 00:16:25 +0000 (00:16 +0000)]
Daily bump.

3 years agoDaily bump.
GCC Administrator [Sun, 7 Feb 2021 00:16:19 +0000 (00:16 +0000)]
Daily bump.