[Bug lto/65475] [5 Regression] ICE in odr_vtable_hasher::equal (Segmentation fault)

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65475

--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
In odr_vtable_hasher::equal:

585      t2 = TYPE_MAIN_VARIANT (t2);
586      if (t1 == t2)
587        return true;
588      tree v1 = BINFO_VTABLE (TYPE_BINFO (t1));
589      tree v2 = BINFO_VTABLE (TYPE_BINFO (t2));
590      return (operand_equal_p (TREE_OPERAND (v1, 1),
591                   TREE_OPERAND (v2, 1), 0)
592          && DECL_ASSEMBLER_NAME
593             (TREE_OPERAND (TREE_OPERAND (v1, 0), 0))
594             == DECL_ASSEMBLER_NAME


(gdb) p t1->type_non_common.binfo->binfo.vtable
$4 = (tree) 0x0

(gdb) p t2->type_non_common.binfo->binfo.vtable
$5 = (tree) 0x7ffff6e289b0


(gdb) p debug_tree(t1)
 <record_type 0x7ffff6e2bd20 failure QI
    size <integer_cst 0x7ffff6c36ca8 type <integer_type 0x7ffff6c3a150
bitsizetype> constant 8>
    unit size <integer_cst 0x7ffff6c36cc0 type <integer_type 0x7ffff6c3a0a8
sizetype> constant 1>
    align 8 symtab 0 alias set -1 canonical type 0x7ffff6e2bd20
    attributes <tree_list 0x7ffff6e28550
        purpose <identifier_node 0x7ffff6e28500 __abi_tag__>
        value <tree_list 0x7ffff6e28528
            value <string_cst 0x7ffff6e1b900 type <array_type 0x7ffff6e2bc78>
                readonly constant static "cxx11\000">>>
    fields <type_decl 0x7ffff6e29558 failure
        type <record_type 0x7ffff6e2e0a8 failure QI size <integer_cst
0x7ffff6c36ca8 8> unit size <integer_cst 0x7ffff6c36cc0 1>
            align 8 symtab 0 alias set -1 canonical type 0x7ffff6e2bd20
attributes <tree_list 0x7ffff6e28550> fields <type_decl 0x7ffff6e29558 failure>
context <record_type 0x7ffff6e2bdc8 ios_base>
            chain <type_decl 0x7ffff6e29260 failure>>
        nonlocal VOID file 1.ii line 4 col 57
        align 1 context <record_type 0x7ffff6e2bd20 failure> result
<record_type 0x7ffff6e2bd20 failure>> context <record_type 0x7ffff6e2bdc8
ios_base>
    chain <type_decl 0x7ffff6e29260 failure>>

(gdb) p debug_tree(t2)
 <record_type 0x7ffff6e2ec78 Trans_NS___cxx11_basic_ostringstream addressable
needs-constructing BLK
    size <integer_cst 0x7ffff6c36bb8 type <integer_type 0x7ffff6c3a150
bitsizetype> constant 64>
    unit size <integer_cst 0x7ffff6c36bd0 type <integer_type 0x7ffff6c3a0a8
sizetype> constant 8>
    align 64 symtab 0 alias set -1 canonical type 0x7ffff6e2ec78
    fields <field_decl 0x7ffff6e29d10 D.3973
        type <record_type 0x7ffff6e2ebd0 B addressable needs-constructing BLK
size <integer_cst 0x7ffff6c36bb8 64> unit size <integer_cst 0x7ffff6c36bd0 8>
            align 64 symtab 0 alias set -1 canonical type 0x7ffff6e2e9d8 fields
<field_decl 0x7ffff6e29be0 _vptr.B> context <namespace_decl 0x7ffff6e29130 std>
            chain <type_decl 0x7ffff6e29b48 B>>
        ignored BLK file 2.ii line 9 col 37 size <integer_cst 0x7ffff6c36bb8
64> unit size <integer_cst 0x7ffff6c36bd0 8>
        align 64 offset_align 128
        offset <integer_cst 0x7ffff6c36be8 constant 0>
        bit offset <integer_cst 0x7ffff6c36c30 constant 0> context <record_type
0x7ffff6e2ec78 Trans_NS___cxx11_basic_ostringstream>
        chain <type_decl 0x7ffff6e29da8 Trans_NS___cxx11_basic_ostringstream
type <record_type 0x7ffff6e2ed20 Trans_NS___cxx11_basic_ostringstream>
            external nonlocal suppress-debug VOID file 2.ii line 9 col 78
            align 8 context <record_type 0x7ffff6e2ec78
Trans_NS___cxx11_basic_ostringstream> result <record_type 0x7ffff6e2ec78
Trans_NS___cxx11_basic_ostringstream>>> context <namespace_decl 0x7ffff6e29130
std>
    chain <type_decl 0x7ffff6e29c78 Trans_NS___cxx11_basic_ostringstream>>


Thanks,
Martin