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debug/10003: gcc -g mis-places low_pc of inlined functions
- From: werner at almesberger dot net
- To: gcc-gnats at gcc dot gnu dot org
- Date: Sat, 8 Mar 2003 11:23:51 -0300
- Subject: debug/10003: gcc -g mis-places low_pc of inlined functions
>Number: 10003
>Category: debug
>Synopsis: gcc -g mis-places low_pc of inlined functions
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Sat Mar 08 14:26:01 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: Werner Almesberger
>Release: 3.3 20030303 (prerelease)
>Organization:
>Environment:
System: Linux ar 2.4.18 #5 Mon Mar 18 09:25:24 ART 2002 i686 unknown
Architecture: i686
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ./configure --prefix=/usr/local/gcc20030303/ --enable-languages=c
>Description:
This one it pretty nasty: if we place a breakpoint at an inlined
function's low_pc, the arguments aren't even on the stack yet !
>How-To-Repeat:
Example (with Red Hat's gcc 3.1 20011127 on ia32):
$ cat <<EOF >foo.c
int xyz;
static inline int foo(int bar)
{
label:
xyz = bar;
}
void main(int argc)
{
foo(123);
}
EOF
$ gcc -w -g foo.c # gcc 3.3: gcc -w -g -finline foo.c
$ readelf -w a.out
...
<2><4a>: Abbrev Number: 4 (DW_TAG_inlined_subroutine)
DW_AT_abstract_origin: <68>
DW_AT_low_pc : 0x80483a8 134513576
...
$ objdump -d a.out
...
08048398 <main>:
...
80483a6: 29 c4 sub %eax,%esp
80483a8: c7 45 fc 7b 00 00 00 movl $0x7b,0xfffffffc(%ebp)
80483af: 8b 45 fc mov 0xfffffffc(%ebp),%eax
80483b2: a3 34 95 04 08 mov %eax,0x8049534
80483b7: c9 leave
...
>Fix:
Work-around: don't access arguments in inlined functions ?
>Release-Note:
>Audit-Trail:
>Unformatted: