The GNU 4.1.2 C++ compiler is mangling typedef names to the point that they are
not retrievable from the DWARF data.
For example, the type BASE_UNION is defined as
typedef union
{
char ch;
int iVal;
long IVal;
} BASE_UNION;
The GNU 4.1.2 compiler generates the following DWARF data for this type
<1><1279>: Abbrev Number: 35 (DW_TAG_union_type)
<127a> DW_AT_sibling : <12a8>
<127e> DW_AT_name : $_4
<1282> DW_AT_byte_size : 4
<1283> DW_AT_decl_file : 35
<1284> DW_AT_decl_line : 29
<2><1285>: Abbrev Number: 36 (DW_TAG_member)
<1286> DW_AT_name : ch
<1289> DW_AT_decl_file : 35
<128a> DW_AT_decl_line : 30
<128b> DW_AT_type : <c0d>
<2><128f>: Abbrev Number: 36 (DW_TAG_member)
<1290> DW_AT_name : iVal
<1295> DW_AT_decl_file : 35
<1296> DW_AT_decl_line : 31
<1297> DW_AT_type : <b7f>
<2><129b>: Abbrev Number: 36 (DW_TAG_member)
<129c> DW_AT_name : IVal
<12a1> DW_AT_decl_file : 35
<12a2> DW_AT_decl_line : 32
<12a3> DW_AT_type : <b86>
Notice that the union name has been changed to "$_4" in DIE <1279>.
The GNU 3.4.4 compiler generates the following DWARF data from the same source
code:
<1><11d0>: Abbrev Number: 27 (DW_TAG_union_type)
DW_AT_sibling : <123f>
DW_AT_name : (indirect string, offset: 0x6e): BASE_UNION
DW_AT_byte_size : 4
DW_AT_decl_file : 3
DW_AT_decl_line : 29
<2><11dc>: Abbrev Number: 28 (DW_TAG_member)
DW_AT_name : ch
DW_AT_decl_file : 3
DW_AT_decl_line : 30
DW_AT_type : <e6d>
<2><11e6>: Abbrev Number: 28 (DW_TAG_member)
DW_AT_name : iVal
DW_AT_decl_file : 3
DW_AT_decl_line : 31
DW_AT_type : <ddf>
<2><11f2>: Abbrev Number: 28 (DW_TAG_member)
DW_AT_name : IVal
DW_AT_decl_file : 3
DW_AT_decl_line : 32
DW_AT_type : <de6>
<2><11fe>: Abbrev Number: 29 (DW_TAG_subprogram)
DW_AT_sibling : <1219>
DW_AT_name : (indirect string, offset: 0x79): operator=
DW_AT_type : <123f>
DW_AT_artificial : 1
DW_AT_declaration : 1
<3><120d>: Abbrev Number: 9 (DW_TAG_formal_parameter)
DW_AT_type : <1245>
DW_AT_artificial : 1
<3><1213>: Abbrev Number: 10 (DW_TAG_formal_parameter)
DW_AT_type : <124b>
<2><1219>: Abbrev Number: 30 (DW_TAG_subprogram)
DW_AT_sibling : <1230>
DW_AT_name : $_4
DW_AT_artificial : 1
DW_AT_declaration : 1
<3><1224>: Abbrev Number: 9 (DW_TAG_formal_parameter)
DW_AT_type : <1245>
DW_AT_artificial : 1
<3><122a>: Abbrev Number: 10 (DW_TAG_formal_parameter)
DW_AT_type : <124b>
<2><1230>: Abbrev Number: 31 (DW_TAG_subprogram)
DW_AT_name : $_4
DW_AT_artificial : 1
DW_AT_declaration : 1
<3><1237>: Abbrev Number: 9 (DW_TAG_formal_parameter)
DW_AT_type : <1245>
DW_AT_artificial : 1
Notice that DIE <11D0> contains the correct type name. Also notice that
coincidently, DIE <1230> has a constructor with the "$_4" name which was used
as the type name in GNU 4.1.2.
Why is GNU 4.1.2 generating the mangled type name and how do I correct this to
generate the real type name?
