------- Additional Comments From sergstesh at yahoo dot com 2009-05-29 05:54
-------
I think you are missing a number of points - look, for example, at the
following:
"
ser...@amdam2:~/try_ltdl> cat f.c
unsigned lib_function1(double input)
{
return (unsigned)input;
}
inline void end1()
{
}
unsigned lib_function2(double input)
{
return (unsigned)input;
}
inline void end2()
{
}
ser...@amdam2:~/try_ltdl> ~/mingwi686/bin/i686-mingw32msvc-gcc -c f.c
ser...@amdam2:~/try_ltdl> ~/mingwi686/bin/i686-mingw32msvc-nm f.o
00000000 b .bss
00000000 d .data
00000000 t .text
00000033 T _end1
0000006b T _end2
00000000 T _lib_function1
00000038 T _lib_function2
ser...@amdam2:~/try_ltdl> ~/mingwi686/bin/i686-mingw32msvc-objdump -S f.o
f.o: file format pe-i386
Disassembly of section .text:
00000000 <_lib_function1>:
0: 55 push %ebp
1: 89 e5 mov %esp,%ebp
3: 83 ec 18 sub $0x18,%esp
6: 8b 45 08 mov 0x8(%ebp),%eax
9: 89 45 f8 mov %eax,-0x8(%ebp)
c: 8b 45 0c mov 0xc(%ebp),%eax
f: 89 45 fc mov %eax,-0x4(%ebp)
12: dd 45 f8 fldl -0x8(%ebp)
15: d9 7d f6 fnstcw -0xa(%ebp)
18: 0f b7 45 f6 movzwl -0xa(%ebp),%eax
1c: b4 0c mov $0xc,%ah
1e: 66 89 45 f4 mov %ax,-0xc(%ebp)
22: d9 6d f4 fldcw -0xc(%ebp)
25: df 7d e8 fistpll -0x18(%ebp)
28: d9 6d f6 fldcw -0xa(%ebp)
2b: 8b 45 e8 mov -0x18(%ebp),%eax
2e: 8b 55 ec mov -0x14(%ebp),%edx
31: c9 leave
32: c3 ret
00000033 <_end1>:
33: 55 push %ebp
34: 89 e5 mov %esp,%ebp
36: 5d pop %ebp
37: c3 ret
00000038 <_lib_function2>:
38: 55 push %ebp
39: 89 e5 mov %esp,%ebp
3b: 83 ec 18 sub $0x18,%esp
3e: 8b 45 08 mov 0x8(%ebp),%eax
41: 89 45 f8 mov %eax,-0x8(%ebp)
44: 8b 45 0c mov 0xc(%ebp),%eax
47: 89 45 fc mov %eax,-0x4(%ebp)
4a: dd 45 f8 fldl -0x8(%ebp)
4d: d9 7d f6 fnstcw -0xa(%ebp)
50: 0f b7 45 f6 movzwl -0xa(%ebp),%eax
54: b4 0c mov $0xc,%ah
56: 66 89 45 f4 mov %ax,-0xc(%ebp)
5a: d9 6d f4 fldcw -0xc(%ebp)
5d: df 7d e8 fistpll -0x18(%ebp)
60: d9 6d f6 fldcw -0xa(%ebp)
63: 8b 45 e8 mov -0x18(%ebp),%eax
66: 8b 55 ec mov -0x14(%ebp),%edx
69: c9 leave
6a: c3 ret
0000006b <_end2>:
6b: 55 push %ebp
6c: 89 e5 mov %esp,%ebp
6e: 5d pop %ebp
6f: c3 ret
ser...@amdam2:~/try_ltdl>
"
- both 'nm' and 'objdump' show (relative) addresses of
_lib_function1
_end1
_lib_function2
_end2
.
Each of the above symbols lengths is
next_symbol_address - this_symbol_address
, where next_symbol_address is either true next_symbol_address or the last seen
in disassembly address plus one - the latter is for the last symbol in any
section.
So, using the above definition I wrote for myself a Perl script (can publish it
here if you are interested) which calculates symbol lengths according to the
above definition.
I' trying to say that symbol length information is there by definition -
otherwise linker wouldn't be able to correctly work, it will make mistakes and
overlap symbol areas, and the issue is properly extracting it.
I.e. even if certain object file format does not present symbol length info
readily available, it can easily be calculated.
And even if you are not going to implement the functionality, you couldn't have
closed the bug as WHATEVER INVALID - the bug _is_ _valid_ because I as end user
requested an action, and the request has been _silently_ ignored, and the word
"silently" is part of the summary.
I.e. if -S switch exists, and the manual says symbol lengths should be
displayed, then the lengths should either be displayed, or at least a warning
saying something like "symbol lengths for this input format are not supported"
should be issued.
Let me make it even more clear: this is a classical case of advertised behavior
(the manual promising symbol sizes in case of -S) is different from actual
behavior (symbol lengths are _not_ displayed), and thus is a _valid_ bug.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|INVALID |
http://sourceware.org/bugzilla/show_bug.cgi?id=10199
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