For the example below, when using gcc 4.5 and svn head, gcc -gdwarf-4 is not
emitting the class definition in an enclosing namespace parent die.
foo.cc:
namespace thread {
class Executor {
public:
static Executor* CurrentExecutor();
};
}
namespace thread {
Executor* Executor::CurrentExecutor() {
return 0;
}
}
thread::Executor *te;
int
main ()
{
return 0;
}
bash$ gcc -g -c -o foo.o foo.cc
bash$ readelf -w foo.o >foo.w
-->
<0><b>: Abbrev Number: 1 (DW_TAG_compile_unit)
< c> DW_AT_producer : (indirect string, offset: 0x13): GNU C++ 4.6.0
20100914 (experimental)
<10> DW_AT_language : 4 (C++)
<11> DW_AT_name : (indirect string, offset: 0x69): foo.cc
<15> DW_AT_comp_dir : (indirect string, offset: 0x0):
/home/dje/src/play
<19> DW_AT_low_pc : 0x0
<21> DW_AT_high_pc : 0xb
<29> DW_AT_stmt_list : 0x0
<1><2d>: Abbrev Number: 2 (DW_TAG_namespace)
<2e> DW_AT_name : (indirect string, offset: 0x70): thread
<32> DW_AT_decl_file : 1
<33> DW_AT_decl_line : 2
<34> DW_AT_sibling : <0x3f>
<2><38>: Abbrev Number: 3 (DW_TAG_class_type)
<39> DW_AT_name : (indirect string, offset: 0x39): Executor
<3d> DW_AT_declaration : 1
<1><3f>: Abbrev Number: 4 (DW_TAG_class_type)
<40> DW_AT_specification: <0x38>
<44> DW_AT_byte_size : 1
<45> DW_AT_decl_file : 1
<46> DW_AT_decl_line : 4
<47> DW_AT_sibling : <0x5d>
<2><4b>: Abbrev Number: 5 (DW_TAG_subprogram)
<4c> DW_AT_external : 1
<4d> DW_AT_name : (indirect string, offset: 0x77): CurrentExecutor
<51> DW_AT_decl_file : 1
<52> DW_AT_decl_line : 6
<53> DW_AT_MIPS_linkage_name: (indirect string, offset: 0x42):
_ZN6thread8Executor15CurrentExecutorEv
<57> DW_AT_type : <0x5d>
<5b> DW_AT_declaration : 1
<1><5d>: Abbrev Number: 6 (DW_TAG_pointer_type)
<5e> DW_AT_byte_size : 8
<5f> DW_AT_type : <0x3f>
<1><63>: Abbrev Number: 7 (DW_TAG_subprogram)
<64> DW_AT_specification: <0x4b>
<68> DW_AT_decl_line : 13
<69> DW_AT_low_pc : 0x0
<71> DW_AT_high_pc : 0xb
<79> DW_AT_frame_base : 0x0 (location list)
bash$ gcc -gdwarf-4 -c -o foo.o foo.cc
bash$ readelf -w foo.o >foo.w
-->
<0><b>: Abbrev Number: 7 (DW_TAG_compile_unit)
< c> DW_AT_producer : (indirect string, offset: 0x13): GNU C++ 4.6.0
20100914 (experimental)
<10> DW_AT_language : 4 (C++)
<11> DW_AT_name : (indirect string, offset: 0x69): foo.cc
<15> DW_AT_comp_dir : (indirect string, offset: 0x0):
/home/dje/src/play
<19> DW_AT_low_pc : 0x0
<21> DW_AT_high_pc : 0xb
<29> DW_AT_stmt_list : 0x0
<1><2d>: Abbrev Number: 8 (DW_TAG_namespace)
<2e> DW_AT_name : (indirect string, offset: 0x70): thread
<32> DW_AT_decl_file : 1
<33> DW_AT_decl_line : 2
<1><34>: Abbrev Number: 9 (DW_TAG_class_type)
<35> DW_AT_name : (indirect string, offset: 0x39): Executor
<39> DW_AT_declaration : 1
<39> DW_AT_sibling : <0x4d>
<2><3d>: Abbrev Number: 5 (DW_TAG_subprogram)
<3e> DW_AT_external : 1
<3e> DW_AT_name : (indirect string, offset: 0x77): CurrentExecutor
<42> DW_AT_decl_file : 1
<43> DW_AT_decl_line : 6
<44> DW_AT_linkage_name: (indirect string, offset: 0x42):
_ZN6thread8Executor15CurrentExecutorEv
<48> DW_AT_type : <0x4d>
<4c> DW_AT_declaration : 1
<1><4d>: Abbrev Number: 10 (DW_TAG_pointer_type)
<4e> DW_AT_byte_size : 8
<4f> DW_AT_type : signature: a547508193f2f296
<1><57>: Abbrev Number: 11 (DW_TAG_subprogram)
<58> DW_AT_specification: <0x3d>
<5c> DW_AT_decl_line : 13
<5d> DW_AT_low_pc : 0x0
<65> DW_AT_high_pc : 0xb
<6d> DW_AT_frame_base : 1 byte block: 9c (DW_OP_call_frame_cfa)
Notice that in the -gdwarf-4 case the die for class Executor is missing an
enclosing namespace parent die.
--
Summary: missing namespace parent die when using -gdwarf-4
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: dje at google dot com
GCC build triplet: amd64-linux
GCC host triplet: amd64-linux
GCC target triplet: amd64-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45682
