It appears that g++ is generating incorrect scope debug information
for inlined functions. One symptom of this is that addr2line will
generate inconsistent results for the affected address ranges, showing
the correct line information for the inlined function, but showing the
function name as the most outer scope that contains the inlined
function.
For example, it may show a line number in a C++ header file and give
the function name as "main".
Environment:
System: Linux toadfish.ninemoons.com 2.6.9-1.681_FC3.stk16 #1 Mon Nov 22
16:44:32 EST 2004 i686 i686 i386 GNU/Linux
Architecture: i686
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: /src/sourceware/gcc/gcc/configure -v
--prefix=/opt/local/sourceware --enable-languages=c,c++
How-To-Repeat:
Compile and link this code:
#include <vector>
using namespace std;
int main ()
{
vector<int> V(10);
V[10] = 1;
}
using a command like:
g++ -ggdb -O2 --save-temps -o t t.cc
Below is an annotated copy of the disassembly of main().
First I removed all the instruction pattern fields since they just
clutter stuff up for our purposes. Having the instruction name and
args is sufficient to see what the code is doing.
Next I ran addr2line on every address, collected the output function
name and line number info, and inserted that as columns 2 and 3 (after
the instruction address and before the instruction name).
Next I examined the dwarf output and looked for the most outer scopes
of the inlined functions. I.E. if DW_TAG_subprogram is scope '<1>'
then I looked for the inlined subroutines at scope '<2>' and inserted
lines in the disassembly at the beginning (beg) and ending (end) of
each scope. This shows the coverage of the function code for inlined
functions. Code outside these scopes SHOULD belong only to code in
main() itself.
If you look at the function names emitted by addr2line (the second
column) you will note that it associates any code outside the scope of
the beg...end regions as belonging to main. All of these SHOULD have
filenames from the line number info of "t.cc". However some of these
ranges identified as code belonging to main are actually code from
inlined functions in the C++ headers, thus there must be some missing
DW_TAG_inlined_subroutine DIES for these sections. For example:
0x804896b main mt_allocator.h:450 call 80486c4 <[EMAIL PROTECTED]>
where the code at line 450 in mt_allocator.h is:
static pool_type&
_S_get_pool()
{
450-> static pool_type _S_pool;
return _S_pool;
}
============================================================================
08048880 <main>:
beg <1><39c1>: Abbrev Number: 111 (DW_TAG_subprogram)
0x8048880 main t.cc:5 push %ebp
0x8048881 main t.cc:5 mov %esp,%ebp
0x8048883 main t.cc:5 push %ebx
0x8048884 main t.cc:5 sub $0x34,%esp
0x8048887 main t.cc:5 and $0xfffffff0,%esp
0x804888a main t.cc:5 sub $0x10,%esp
beg <2><39e7>: Abbrev Number: 92 (DW_TAG_inlined_subroutine): vector
0x804888d _S_get_pool mt_allocator.h:450 cmpb $0x0,0x804a768
0x8048894 _S_get_pool mt_allocator.h:450 je 8048964
<main+0xe4>
0x804889a _M_allocate stl_vector.h:117 xor %eax,%eax
0x804889c _M_allocate stl_vector.h:117 lea
0xffffffe8(%ebp),%ebx
0x804889f _M_allocate stl_vector.h:117 mov %eax,0x8(%esp)
0x80488a3 _M_allocate stl_vector.h:117 mov $0xa,%eax
0x80488a8 _Vector_impl stl_vector.h:85 movl
$0x0,0xffffffe8(%ebp)
0x80488af _Vector_impl stl_vector.h:85 movl
$0x0,0xffffffec(%ebp)
0x80488b6 _Vector_impl stl_vector.h:85 movl
$0x0,0xfffffff0(%ebp)
0x80488bd _Vector_base stl_vector.h:117 mov %eax,0x4(%esp)
0x80488c1 _Vector_base stl_vector.h:117 mov %ebx,(%esp)
0x80488c4 _Vector_base stl_vector.h:117 call 8049140
<__gnu_cxx::__mt_alloc<int, __gnu_cxx::__common_pool_policy<__gnu_cxx::__pool,
true> >::allocate(unsigned int, void const*)>
0x80488c9 _S_get_pool mt_allocator.h:450 cmpb $0x0,0x804a768
0x80488d0 vector stl_vector.h:103 mov
%eax,0xffffffe8(%ebp)
0x80488d3 vector stl_vector.h:104 mov
%eax,0xffffffec(%ebp)
0x80488d6 vector stl_vector.h:105 lea 0x28(%eax),%eax
0x80488d9 vector stl_vector.h:105 mov
%eax,0xfffffff0(%ebp)
0x80488dc vector mt_allocator.h:450 je 8048a50
<main+0x1d0>
0x80488e2 vector stl_vector.h:219 lea
0xfffffffa(%ebp),%eax
0x80488e5 vector stl_vector.h:219 mov $0xa,%edx
0x80488ea vector stl_vector.h:219 mov %eax,0xc(%esp)
0x80488ee vector stl_vector.h:219 lea
0xfffffff4(%ebp),%eax
0x80488f1 vector stl_vector.h:219 mov %eax,0x8(%esp)
0x80488f5 vector stl_vector.h:219 mov
0xffffffe8(%ebp),%eax
0x80488f8 vector stl_vector.h:219 mov %edx,0x4(%esp)
0x80488fc vector stl_vector.h:219 movl
$0x0,0xfffffff4(%ebp)
0x8048903 vector stl_vector.h:219 mov %eax,(%esp)
0x8048906 vector stl_vector.h:219 call 8048d40 <void
std::__uninitialized_fill_n_a<int*, unsigned int, int, int>(int*, unsigned int,
int const&, std::allocator<int>)>
0x804890b vector stl_vector.h:221 mov
0xffffffe8(%ebp),%edx
end <2><39e7>: Abbrev Number: 92 (DW_TAG_inlined_subroutine): vector
0x804890e main t.cc:8 movl $0x1,0x28(%edx)
0x8048915 main stl_vector.h:221 lea 0x28(%edx),%eax
beg <2><3aed>: Abbrev Number: 92 (DW_TAG_inlined_subroutine): ~vector
0x8048918 _S_get_pool mt_allocator.h:450 cmpb $0x0,0x804a768
end <2><3aed>: Abbrev Number: 92 (DW_TAG_inlined_subroutine): ~vector
0x804891f main stl_vector.h:221 mov
%eax,0xffffffec(%ebp)
0x8048922 main mt_allocator.h:450 je 8048a30
<main+0x1b0>
0x8048928 main stl_vector.h:273 lea
0xfffffffb(%ebp),%eax
0x804892b main stl_vector.h:273 mov %eax,0x8(%esp)
0x804892f main stl_vector.h:273 mov
0xffffffec(%ebp),%eax
0x8048932 main stl_vector.h:273 mov %edx,(%esp)
0x8048935 main stl_vector.h:273 mov %eax,0x4(%esp)
0x8048939 main stl_vector.h:273 call 8048c30 <void
std::_Destroy<int*, std::allocator<int> >(int*, int*, std::allocator<int>)>
beg <2><3b5b>: Abbrev Number: 92 (DW_TAG_inlined_subroutine): ~_Vector_base
0x804893e ~_Vector_base stl_vector.h:109 mov
0xffffffe8(%ebp),%edx
0x8048941 ~_Vector_base stl_vector.h:109 mov
0xfffffff0(%ebp),%eax
0x8048944 ~_Vector_base stl_vector.h:109 sub %edx,%eax
0x8048946 ~_Vector_base stl_vector.h:109 sar $0x2,%eax
0x8048949 _M_deallocate stl_vector.h:122 test %edx,%edx
0x804894b _M_deallocate stl_vector.h:122 je 804895d
<main+0xdd>
0x804894d _M_deallocate stl_vector.h:123 mov %eax,0x8(%esp)
0x8048951 _M_deallocate stl_vector.h:123 mov %edx,0x4(%esp)
0x8048955 _M_deallocate stl_vector.h:123 mov %ebx,(%esp)
0x8048958 _M_deallocate stl_vector.h:123 call 8048d50
<__gnu_cxx::__mt_alloc<int, __gnu_cxx::__common_pool_policy<__gnu_cxx::__pool,
true> >::deallocate(int*, unsigned int)>
end <2><3b5b>: Abbrev Number: 92 (DW_TAG_inlined_subroutine): ~_Vector_base
0x804895d main t.cc:9 mov
0xfffffffc(%ebp),%ebx
0x8048960 main t.cc:9 xor %eax,%eax
0x8048962 main t.cc:9 leave
0x8048963 main t.cc:9 ret
0x8048964 main mt_allocator.h:450 movl $0x804a768,(%esp)
0x804896b main mt_allocator.h:450 call 80486c4 <[EMAIL
PROTECTED]>
0x8048970 main mt_allocator.h:450 test %eax,%eax
0x8048972 main mt_allocator.h:450 jne 8048b8a
<main+0x30a>
0x8048978 main mt_allocator.h:450 movzbl 0x804a768,%eax
beg <2><3b8f>: Abbrev Number: 92 (DW_TAG_inlined_subroutine): allocator
0x804897f _S_get_pool mt_allocator.h:112 test %al,%al
0x8048981 _S_get_pool mt_allocator.h:112 jne 804889a
<main+0x1a>
0x8048987 _S_get_pool mt_allocator.h:112 movl $0x804a768,(%esp)
0x804898e _S_get_pool mt_allocator.h:112 call 80486c4 <[EMAIL
PROTECTED]>
0x8048993 _S_get_pool mt_allocator.h:112 test %eax,%eax
0x8048995 _S_get_pool mt_allocator.h:112 je 804889a
<main+0x1a>
0x804899b _Tune mt_allocator.h:112 mov $0x8,%eax
0x80489a0 _Tune mt_allocator.h:112 mov %eax,0x804a780
0x80489a5 _Tune mt_allocator.h:112 mov $0x80,%eax
0x80489aa _Tune mt_allocator.h:112 mov %eax,0x804a784
0x80489af _Tune mt_allocator.h:112 mov $0x8,%eax
0x80489b4 _Tune mt_allocator.h:112 mov %eax,0x804a788
0x80489b9 _Tune mt_allocator.h:112 mov $0xff0,%eax
0x80489be _Tune mt_allocator.h:112 mov %eax,0x804a78c
0x80489c3 _Tune mt_allocator.h:112 mov $0x1000,%eax
0x80489c8 _Tune mt_allocator.h:112 mov %eax,0x804a790
0x80489cd _Tune mt_allocator.h:112 mov $0xa,%eax
0x80489d2 _Tune mt_allocator.h:112 movl $0x80494dc,(%esp)
0x80489d9 _Tune mt_allocator.h:112 mov %eax,0x804a794
0x80489de _Tune mt_allocator.h:112 call 80486d4 <[EMAIL
PROTECTED]>
0x80489e3 __pool mt_allocator.h:368 mov $0x1,%edx
0x80489e8 __pool mt_allocator.h:368 mov %edx,0x804a7a8
0x80489ee _S_get_pool mt_allocator.h:450 movl $0x804a768,(%esp)
0x80489f5 _S_get_pool mt_allocator.h:155 movb $0x0,0x804a7a0
0x80489fc _S_get_pool mt_allocator.h:112 test %eax,%eax
0x80489fe _S_get_pool mt_allocator.h:112 setne 0x804a798
0x8048a05 _S_get_pool mt_allocator.h:368 xor %eax,%eax
0x8048a07 _S_get_pool mt_allocator.h:155 xor %ebx,%ebx
0x8048a09 _S_get_pool mt_allocator.h:368 xor %ecx,%ecx
0x8048a0b _S_get_pool mt_allocator.h:368 mov %eax,0x804a7b0
0x8048a10 _S_get_pool mt_allocator.h:372 xor %eax,%eax
0x8048a12 _S_get_pool mt_allocator.h:155 mov %ebx,0x804a79c
0x8048a18 _S_get_pool mt_allocator.h:368 mov %ecx,0x804a7a4
0x8048a1e _S_get_pool mt_allocator.h:372 mov %eax,0x804a7ac
0x8048a23 _S_get_pool mt_allocator.h:450 call 8048704 <[EMAIL
PROTECTED]>
0x8048a28 _S_get_pool mt_allocator.h:450 jmp 804889a
<main+0x1a>
0x8048a2d _S_get_pool mt_allocator.h:450 lea 0x0(%esi),%esi
end <2><3b8f>: Abbrev Number: 92 (DW_TAG_inlined_subroutine): allocator
0x8048a30 main mt_allocator.h:450 movl $0x804a768,(%esp)
0x8048a37 main mt_allocator.h:450 call 80486c4 <[EMAIL
PROTECTED]>
0x8048a3c main mt_allocator.h:450 test %eax,%eax
0x8048a3e main mt_allocator.h:450 jne 8048af6
<main+0x276>
0x8048a44 main mt_allocator.h:450 mov
0xffffffe8(%ebp),%edx
0x8048a47 main mt_allocator.h:450 jmp 8048928
<main+0xa8>
0x8048a4c main mt_allocator.h:450 lea 0x0(%esi),%esi
0x8048a50 main mt_allocator.h:450 movl $0x804a768,(%esp)
0x8048a57 main mt_allocator.h:450 call 80486c4 <[EMAIL
PROTECTED]>
0x8048a5c main mt_allocator.h:450 test %eax,%eax
0x8048a5e main mt_allocator.h:450 je 80488e2
<main+0x62>
beg <2><3c23>: Abbrev Number: 92 (DW_TAG_inlined_subroutine): __pool
0x8048a64 _Tune mt_allocator.h:112 mov $0x8,%eax
0x8048a69 _Tune mt_allocator.h:112 mov $0x8,%ecx
0x8048a6e _Tune mt_allocator.h:112 mov %eax,0x804a780
0x8048a73 _Tune mt_allocator.h:112 mov $0x80,%eax
0x8048a78 _Tune mt_allocator.h:112 mov $0xff0,%edx
0x8048a7d _Tune mt_allocator.h:112 mov %eax,0x804a784
0x8048a82 _Tune mt_allocator.h:112 mov $0x1000,%eax
0x8048a87 _Tune mt_allocator.h:112 mov %eax,0x804a790
0x8048a8c _Tune mt_allocator.h:112 mov $0xa,%eax
0x8048a91 _Tune mt_allocator.h:112 mov %ecx,0x804a788
0x8048a97 _Tune mt_allocator.h:112 mov %edx,0x804a78c
0x8048a9d _Tune mt_allocator.h:112 movl $0x80494dc,(%esp)
0x8048aa4 _Tune mt_allocator.h:112 mov %eax,0x804a794
0x8048aa9 _Tune mt_allocator.h:112 call 80486d4 <[EMAIL
PROTECTED]>
end <2><3c23>: Abbrev Number: 92 (DW_TAG_inlined_subroutine): __pool
0x8048aae main mt_allocator.h:450 movl $0x804a768,(%esp)
0x8048ab5 main mt_allocator.h:155 movb $0x0,0x804a7a0
0x8048abc main mt_allocator.h:112 test %eax,%eax
0x8048abe main mt_allocator.h:112 setne 0x804a798
0x8048ac5 main mt_allocator.h:155 xor %eax,%eax
0x8048ac7 main mt_allocator.h:372 xor %ecx,%ecx
0x8048ac9 main mt_allocator.h:155 mov %eax,0x804a79c
0x8048ace main mt_allocator.h:368 xor %eax,%eax
0x8048ad0 main mt_allocator.h:368 mov %eax,0x804a7a4
0x8048ad5 main mt_allocator.h:368 mov $0x1,%eax
0x8048ada main mt_allocator.h:368 mov %eax,0x804a7a8
0x8048adf main mt_allocator.h:368 xor %eax,%eax
0x8048ae1 main mt_allocator.h:368 mov %eax,0x804a7b0
0x8048ae6 main mt_allocator.h:372 mov %ecx,0x804a7ac
0x8048aec main mt_allocator.h:450 call 8048704 <[EMAIL
PROTECTED]>
0x8048af1 main mt_allocator.h:450 jmp 80488e2
<main+0x62>
beg <2><3c6a>: Abbrev Number: 92 (DW_TAG_inlined_subroutine): __pool
0x8048af6 _Tune mt_allocator.h:112 mov $0x8,%eax
0x8048afb _Tune mt_allocator.h:112 mov %eax,0x804a780
0x8048b00 _Tune mt_allocator.h:112 mov $0x80,%eax
0x8048b05 _Tune mt_allocator.h:112 mov %eax,0x804a784
0x8048b0a _Tune mt_allocator.h:112 mov $0x8,%eax
0x8048b0f _Tune mt_allocator.h:112 mov %eax,0x804a788
0x8048b14 _Tune mt_allocator.h:112 mov $0xff0,%eax
0x8048b19 _Tune mt_allocator.h:112 mov %eax,0x804a78c
0x8048b1e _Tune mt_allocator.h:112 mov $0x1000,%eax
0x8048b23 _Tune mt_allocator.h:112 mov %eax,0x804a790
0x8048b28 _Tune mt_allocator.h:112 mov $0xa,%eax
0x8048b2d _Tune mt_allocator.h:112 mov %eax,0x804a794
0x8048b32 _Tune mt_allocator.h:112 movl $0x80494dc,(%esp)
0x8048b39 _Tune mt_allocator.h:112 call 80486d4 <[EMAIL
PROTECTED]>
0x8048b3e __pool_base mt_allocator.h:155 movb $0x0,0x804a7a0
end <2><3c6a>: Abbrev Number: 92 (DW_TAG_inlined_subroutine): __pool
0x8048b45 main mt_allocator.h:450 movl $0x804a768,(%esp)
0x8048b4c main mt_allocator.h:112 test %eax,%eax
0x8048b4e main mt_allocator.h:368 mov $0x1,%eax
0x8048b53 main mt_allocator.h:112 setne 0x804a798
0x8048b5a main mt_allocator.h:368 xor %edx,%edx
0x8048b5c main mt_allocator.h:155 xor %ecx,%ecx
0x8048b5e main mt_allocator.h:368 mov %eax,0x804a7a8
0x8048b63 main mt_allocator.h:368 xor %eax,%eax
0x8048b65 main mt_allocator.h:368 mov %eax,0x804a7b0
0x8048b6a main mt_allocator.h:372 xor %eax,%eax
0x8048b6c main mt_allocator.h:368 mov %edx,0x804a7a4
0x8048b72 main mt_allocator.h:155 mov %ecx,0x804a79c
0x8048b78 main mt_allocator.h:372 mov %eax,0x804a7ac
0x8048b7d main mt_allocator.h:450 call 8048704 <[EMAIL
PROTECTED]>
0x8048b82 main mt_allocator.h:450 mov
0xffffffe8(%ebp),%edx
0x8048b85 main mt_allocator.h:450 jmp 8048928
<main+0xa8>
beg <2><3cb1>: Abbrev Number: 92 (DW_TAG_inlined_subroutine): __pool
0x8048b8a _Tune mt_allocator.h:112 mov $0x8,%eax
0x8048b8f _Tune mt_allocator.h:112 mov $0x8,%ecx
0x8048b94 _Tune mt_allocator.h:112 mov %eax,0x804a788
0x8048b99 _Tune mt_allocator.h:112 mov $0xff0,%eax
0x8048b9e _Tune mt_allocator.h:112 mov $0x80,%edx
0x8048ba3 _Tune mt_allocator.h:112 mov %eax,0x804a78c
0x8048ba8 _Tune mt_allocator.h:112 mov $0x1000,%eax
0x8048bad __pool mt_allocator.h:368 mov $0x1,%ebx
0x8048bb2 __pool mt_allocator.h:112 mov %eax,0x804a790
0x8048bb7 __pool mt_allocator.h:112 mov $0xa,%eax
0x8048bbc __pool mt_allocator.h:112 mov %ecx,0x804a780
0x8048bc2 __pool mt_allocator.h:112 mov %edx,0x804a784
0x8048bc8 __pool mt_allocator.h:112 mov %eax,0x804a794
0x8048bcd __pool mt_allocator.h:112 movl $0x80494dc,(%esp)
0x8048bd4 __pool mt_allocator.h:112 call 80486d4 <[EMAIL
PROTECTED]>
0x8048bd9 __pool mt_allocator.h:155 movb $0x0,0x804a7a0
end <2><3cb1>: Abbrev Number: 92 (DW_TAG_inlined_subroutine): __pool
0x8048be0 __pool mt_allocator.h:368 mov %ebx,0x804a7a8
0x8048be6 main mt_allocator.h:450 movl $0x804a768,(%esp)
0x8048bed main mt_allocator.h:112 test %eax,%eax
0x8048bef main mt_allocator.h:112 setne 0x804a798
0x8048bf6 main mt_allocator.h:155 xor %eax,%eax
0x8048bf8 main mt_allocator.h:368 xor %ecx,%ecx
0x8048bfa main mt_allocator.h:372 xor %edx,%edx
0x8048bfc main mt_allocator.h:155 mov %eax,0x804a79c
0x8048c01 main mt_allocator.h:368 xor %eax,%eax
0x8048c03 main mt_allocator.h:368 mov %eax,0x804a7a4
0x8048c08 main mt_allocator.h:368 mov %ecx,0x804a7b0
0x8048c0e main mt_allocator.h:372 mov %edx,0x804a7ac
0x8048c14 main mt_allocator.h:450 call 8048704 <[EMAIL
PROTECTED]>
0x8048c19 main mt_allocator.h:450 movzbl 0x804a768,%eax
0x8048c20 main mt_allocator.h:450 jmp 804897f
<main+0xff>
beg <2><3cf8>: Abbrev Number: 91 (DW_TAG_inlined_subroutine): ~_Vector_impl
0x8048c25 ~_Vector_impl stl_vector.h:101 mov %eax,(%esp)
0x8048c28 ~_Vector_impl stl_vector.h:101 call 8048774 <[EMAIL
PROTECTED]>
end <2><3cf8>: Abbrev Number: 91 (DW_TAG_inlined_subroutine): ~_Vector_impl
end <1><39c1>: Abbrev Number: 111 (DW_TAG_subprogram)
0x8048c2d main stl_vector.h:101 nop
0x8048c2e main ??:0 nop
0x8048c2f main ??:0 nop
--
Summary: g++ generates incomplete debug information for given
testcase
Product: gcc
Version: 1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: fnf at specifixinc dot com
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: i686-pc-linux-gnu
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20268
