[Bug middle-end/67133] [6 Regression] ICE at -Os and above on x86_64-linux-gnu in gimple_op, at gimple.h:2274

["manu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67133

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |law at gcc dot gnu.org

--- Comment #7 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Zhendong Su from comment #0)
> The following code causes an ICE when compiled with the current gcc trunk at
> -Os and above on x86_64-linux-gnu in both 32-bit and 64-bit modes.
> 
> It is a regression from 5.1.x. 

This was already latent in r226635, just compile with options:

-Os -fisolate-erroneous-paths-dereference -fisolate-erroneous-paths-attribute

The problem is that infer_nonnull_range gets:

(gdb) p debug_gimple_stmt(stmt)
__builtin_unreachable ();

which is decorated with attributes:

(gdb) p debug_tree(attrs)
 <tree_list 0x7ffff64b3bb8
    purpose <identifier_node 0x7ffff644b3c0 nonnull>
    value <tree_list 0x7ffff645edc0
        value <integer_cst 0x7ffff6444060 constant 1>>
    chain <tree_list 0x7ffff64b3b90
        purpose <identifier_node 0x7ffff644b2d0 format>
        value <tree_list 0x7ffff6460730
            value <identifier_node 0x7ffff644b550 printf>
            chain <tree_list 0x7ffff645ef00 value <integer_cst 0x7ffff6444060
1>
                chain <tree_list 0x7ffff645ede8
                    value <integer_cst 0x7ffff6444318 constant 2>>>>>>

That is, this __builtin_unreachable has __attribute__((nonnull(1))), which
doesn't make any sense and breaks infer_nonnull_range when it tries to access
its first argument.

I have no idea whatsoever how __builtin_unreachable gets to have attribute
nonnull, but that is a pre-existing bug. Surprising it doesn't break more
stuff.
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Subject: [Bug middle-end/67133] [6 Regression] ICE at -Os and above on x86_64-linux-gnu in gimple_op, at gimple.h:2274
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67133

--- Comment #8 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Or even with options: -O2 -fisolate-erroneous-paths-attribute

(why is the latter not enabled by default?)
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From: "trippels at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/67139] [concepts] ICE on checking concepts with void
Date: Thu, 06 Aug 2015 18:41:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idg139

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-08-06
                 CC|                            |trippels at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
markus@x4 tmp % cat o.ii
template <typename T> typename T::typevalue_type _v;
template <class T> concept bool Constructible() { return _v<T>; }

template <class T> concept bool MoveConstructible() {
  return Constructible<T &&>();
}

template <class> constexpr bool move_constructible() { return false; }
MoveConstructible { T }
constexpr bool move_constructible() { return true; }

static_assert((!move_constructible<void>()), "");


markus@x4 tmp % g++ -std=gnu++1z -c o.ii
o.ii:12:42: internal compiler error: Segmentation fault
 static_assert((!move_constructible<void>()), "");
                                          ^
0xc7f85f crash_signal
        ../../gcc/gcc/toplev.c:352
0x7fab31e0770f ???
        /var/tmp/glibc/signal/../sysdeps/unix/sysv/linux/x86_64/sigaction.c:0
0xef7bd0 strip_array_types(tree_node*)
        ../../gcc/gcc/tree.c:8194
0x71a2e8 cp_type_quals(tree_node const*)
        ../../gcc/gcc/cp/typeck.c:9006
0x790024 cv_unqualified(tree_node*)
        ../../gcc/gcc/cp/tree.c:1161
0x7fc8c4 satisfy_predicate_constraint
        ../../gcc/gcc/cp/constraint.cc:1705
0x7fc8c4 satisfy_constraint_1
        ../../gcc/gcc/cp/constraint.cc:1901
0x7fd5f6 satisfy_constraint
        ../../gcc/gcc/cp/constraint.cc:1952
0x7fd74c constraints_satisfied_p(tree_node*)
        ../../gcc/gcc/cp/constraint.cc:2059
0x5d832c add_function_candidate
        ../../gcc/gcc/cp/call.c:1986
0x5d8e88 add_template_candidate_real
        ../../gcc/gcc/cp/call.c:3109
0x5d957c add_template_candidate
        ../../gcc/gcc/cp/call.c:3151
0x5d957c add_candidates
        ../../gcc/gcc/cp/call.c:5307
0x5dbc03 perform_overload_resolution
        ../../gcc/gcc/cp/call.c:4003
0x5de10e build_new_function_call(tree_node*, vec<tree_node*, va_gc,
vl_embed>**, bool, int)
        ../../gcc/gcc/cp/call.c:4080
0x76b998 finish_call_expr(tree_node*, vec<tree_node*, va_gc, vl_embed>**, bool,
bool, int)
        ../../gcc/gcc/cp/semantics.c:2391
0x6e9737 cp_parser_postfix_expression
        ../../gcc/gcc/cp/parser.c:6421
0x6ee229 cp_parser_unary_expression
        ../../gcc/gcc/cp/parser.c:7485
0x6ee188 cp_parser_unary_expression
        ../../gcc/gcc/cp/parser.c:7438
0x6eee57 cp_parser_binary_expression
        ../../gcc/gcc/cp/parser.c:8222
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