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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/98992] New: attribute malloc error associating a member
 deallocator with an allocator
Date: Sun, 07 Feb 2021 23:20:18 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98992

            Bug ID: 98992
           Summary: attribute malloc error associating a member
                    deallocator with an allocator
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: msebor at gcc dot gnu.org
  Target Milestone: ---

The new attribute malloc is rejected on declarations of member function:

$ cat t.C && /build/gcc-master/gcc/xg++ -B /build/gcc-master/gcc -S -Wall t=
.C
struct A
{
  void dealloc (void*);

  __attribute__ ((malloc (dealloc)))=20
  void* alloc ();
};
t.C:6:16: error: =E2=80=98malloc=E2=80=99 attribute argument 1 does not nam=
e a function
    6 |   void* alloc ();
      |                ^


The attribute handler is prepared for FUNCTION_DECL and OVERLOAD but not for
how a member function is represented here:

 <component_ref 0x7fffea969930
    type <lang_type 0x7fffea9532a0 unknown type type <lang_type 0x7fffea953=
2a0
unknown type>
        VOID
        align:1 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x7fffea9532a0
        pointer_to_this <lang_type 0x7fffea9532a0 unknown type>
reference_to_this <lang_type 0x7fffea9532a0 unknown type>>

    arg:0 <indirect_ref 0x7fffea9549c0
        type <record_type 0x7fffea96a000 S cxx-odr-p type_1 type_5 VOID
            align:8 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x7fffea96a000 fields <function_decl 0x7fffea96d000 m_dealloc> context
<translation_unit_decl 0x7fffea805168 /build/tmp/t.C>
            full-name "struct S"
            n_parents=3D0 use_template=3D0 interface-unknown
            pointer_to_this <pointer_type 0x7fffea96a150> chain <type_decl
0x7fffea8248e8 S>>

        arg:0 <convert_expr 0x7fffea9549a0 type <pointer_type 0x7fffea96a15=
0>
            constant
            arg:0 <void_cst 0x7fffea809b50 type <void_type 0x7fffea815f18 v=
oid>
                constant>>>
    arg:1 <baselink 0x7fffea969900
        type <method_type 0x7fffea96a690 type <void_type 0x7fffea815f18 voi=
d>
            QI
            size <integer_cst 0x7fffea7f7fa8 constant 8>
            unit-size <integer_cst 0x7fffea7f7fc0 constant 1>
            align:8 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x7fffea96a690 method basetype <record_type 0x7fffea96a000 S>
            arg-types <tree_list 0x7fffea955f28 value <pointer_type
0x7fffea96a150>
                chain <tree_list 0x7fffea955f00 value <pointer_type
0x7fffea81fc78>
                    chain <tree_list 0x7fffea80b8e8 value <void_type
0x7fffea815f18 void>>>>>

        functions <function_decl 0x7fffea96d000 m_dealloc type <method_type
0x7fffea96a690>
            used public private external decl_3 QI /build/tmp/t.C:8:8 align=
:16
warn_if_not_align:0 context <record_type 0x7fffea96a000 S>
            full-name "void S::m_dealloc(char*)" chain <function_decl
0x7fffea95af00 __dt >>
        binfo <tree_binfo 0x7fffea95e420 type <record_type 0x7fffea96a000 S>
            public private bases:0 offset <integer_cst 0x7fffea7f7ee8 0>>
access_binfo <tree_binfo 0x7fffea95e420>>
    /build/tmp/t.C:9:27 start: /build/tmp/t.C:9:27 finish: /build/tmp/t.C:9=
:35>=