From: "mjw at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug translator/12609] New: Cannot see variable values in partial inlined functions with gcc 4.6
Date: Mon, 28 Mar 2011 10:34:00 -0000 [thread overview]
Message-ID: <bug-12609-6586@http.sourceware.org/bugzilla/> (raw)
http://sourceware.org/bugzilla/show_bug.cgi?id=12609
Summary: Cannot see variable values in partial inlined
functions with gcc 4.6
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: translator
AssignedTo: systemtap@sourceware.org
ReportedBy: mjw@redhat.com
Take the following program foo.c:
$ cat foo.c
/* { dg-options "-g -O2" } */
extern void abort (void);
volatile int v;
#define V1 v++; v++; v++; v++; v++; v++; v++; v++; v++; v++;
#define V2 V1 V1 V1 V1 V1 V1 V1 V1 V1 V1
static int
foo (int x)
{
int a = 2 * x + 4;
int b = 6;
if (x < 30)
{
int c = 8;
int d = 8 * x;
return 6;
}
else
{
int e = 134;
int f = 9 * x;
V2
return v + 17;
}
}
int
main (void)
{
if (foo (v) > 10000)
abort ();
foo (70);
return 0;
}
Compiled with gcc 4.5 -g -O2 -o foo.old foo.c systemtap is happy to probe the
(inlined) foo and variables:
$ stap -e 'probe process ("./foo.old").function("foo") { printf("%s@0x%x\n",
pp(), uaddr()); log ($$vars) }' -c ./foo.old
process("/tmp/foo.old").function("foo@/tmp/foo.c:8")@0x4004d0
x=0x0 a=0x4 b=0x6
process("/tmp/foo.old").function("foo@/tmp/foo.c:8")@0x4004d0
x=0x46 a=0x90 b=0x6
But compiled with gcc 4.6 (actually my test was with gcc trunk, but that is
still fairly similar) -g -O2 -o foo.new foo.c systemtap is unable to find the
value of most variables:
$ stap -e 'probe process ("./foo.new").function("foo") { printf("%s@0x%x\n",
pp(), uaddr()); log ($$vars) }' -c ./foo.new
process("/tmp/foo.new").function("foo@/tmp/foo.c:8")@0x400aaa
x=0x0
process("/tmp/foo.new").function("foo@/tmp/foo.c:8")@0x4004b0
a=? x=? b=?
--
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next reply other threads:[~2011-03-28 10:34 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-28 10:34 mjw at redhat dot com [this message]
2011-05-16 21:29 ` [Bug translator/12609] " fche at redhat dot com
2011-05-17 9:21 ` mjw at redhat dot com
2011-05-17 9:28 ` fche at redhat dot com
2011-05-17 9:31 ` mjw at redhat dot com
2020-04-10 14:53 ` fche at redhat dot com
2020-04-11 1:40 ` fche at redhat dot com
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