Hi Cary,
Thanks for your comments.
> Is this a recursive inlined call?
No, it is not a recursive call.
> It appears that the subprogram is defined at line 58 in the source
> file, and the inlined call also occurs at line 58, so something looks
> fishy. What does the source code look like?
You are right that ext2_lookup is defined at line 58 but there is no
call at the same line. Other than that, ext2_lookup is referenced as
follows in the same C file.
At line 383
const struct inode_operations ext2_dir_inode_operations = {
.create = ext2_create,
.lookup = ext2_lookup,
...............
...............
}
At line 126
if (!root->d_inode ||
!root->d_inode->i_op ||
!root->d_inode->i_op->lookup ||
...................)
At line 782
if (!subdir->d_inode->i_op ||
..........
!subdir->d_inode->i_op->lookup ||
.........)
At line 1317
old = dir->i_op->lookup(dir, dentry, flags);
Also, if we closely look at the debug information tables (pasted below
again), the DW_AT_location attribute is not generated either for all
formal parameters in the concrete inlined instance tree OR for all
function local variables in the out-of-line inlined instance tree.
Isn't that something abnormal?
Following is the relevant piece of ext2_lookup definition to know the
arguments and local variables.
static struct dentry *ext2_lookup(struct inode * dir, struct dentry
*dentry, unsigned int flags)
{
struct inode * inode;
ino_t ino;
.............
}
<1><10397ce>: Abbrev Number: 92 (DW_TAG_subprogram)
<10397cf> DW_AT_abstract_origin: <0x1038302>
<10397d3> DW_AT_low_pc : 0xc0000000001b4980
<10397db> DW_AT_high_pc : 0xc0000000001b4a60
<10397e3> DW_AT_frame_base : 0x53243a (location list)
<10397e7> DW_AT_GNU_all_call_sites: 1
<10397e8> DW_AT_sibling : <0x10398eb>
<2><10397ec>: Abbrev Number: 70 (DW_TAG_formal_parameter)
<10397ed> DW_AT_abstract_origin: <0x1038313>
<10397f1> DW_AT_location : 0x5324c5 (location list)
<2><10397f5>: Abbrev Number: 70 (DW_TAG_formal_parameter)
<10397f6> DW_AT_abstract_origin: <0x103831e>
<10397fa> DW_AT_location : 0x53254d (location list)
<2><10397fe>: Abbrev Number: 70 (DW_TAG_formal_parameter)
<10397ff> DW_AT_abstract_origin: <0x1038329>
<1039803> DW_AT_location : 0x5325e8 (location list)
<2><1039807>: Abbrev Number: 93 (DW_TAG_variable)
<1039808> DW_AT_abstract_origin: <0x1038334>
<2><103980c>: Abbrev Number: 93 (DW_TAG_variable)
<103980d> DW_AT_abstract_origin: <0x103833f>
<2><1039811>: Abbrev Number: 94 (DW_TAG_variable)
<1039812> DW_AT_abstract_origin: <0x103834a>
<1039816> DW_AT_location : 9 byte block: 3 c0 0 0 0 0 79 3e
a0 (DW_OP_addr: c000000000793ea0)
<2><1039820>: Abbrev Number: 95 (DW_TAG_inlined_subroutine)
<1039821> DW_AT_abstract_origin: <0x1038302>
<1039825> DW_AT_entry_pc : 0xc0000000001b49d0
<103982d> DW_AT_ranges : 0x14a0c0
<1039831> DW_AT_call_file : 1
<1039832> DW_AT_call_line : 58
<3><1039833>: Abbrev Number: 96 (DW_TAG_formal_parameter)
<1039834> DW_AT_abstract_origin: <0x103831e>
<3><1039838>: Abbrev Number: 70 (DW_TAG_formal_parameter)
<1039839> DW_AT_abstract_origin: <0x1038313>
<103983d> DW_AT_location : 0x53264a (location list)
<3><1039841>: Abbrev Number: 86 (DW_TAG_lexical_block)
<1039842> DW_AT_ranges : 0x14a0f0
<4><1039846>: Abbrev Number: 87 (DW_TAG_variable)
<1039847> DW_AT_abstract_origin: <0x1038334>
<103984b> DW_AT_location : 0x532696 (location list)
<4><103984f>: Abbrev Number: 87 (DW_TAG_variable)
<1039850> DW_AT_abstract_origin: <0x103833f>
<1039854> DW_AT_location : 0x5326f4 (location list)
<4><1039858>: Abbrev Number: 96 (DW_TAG_formal_parameter)
<1039859> DW_AT_abstract_origin: <0x1038329>
<4><103985d>: Abbrev Number: 94 (DW_TAG_variable)
<103985e> DW_AT_abstract_origin: <0x103834a>
<1039862> DW_AT_location : 9 byte block: 3 c0 0 0 0 0 79 3e
a0 (DW_OP_addr: c000000000793ea0)
Thank you,
Venkata Ramanaiah N
_______________________________________________
Dwarf-Discuss mailing list
Dwarf-Discuss@lists.dwarfstd.org
http://lists.dwarfstd.org/listinfo.cgi/dwarf-discuss-dwarfstd.org
