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Date: Wed, 09 Aug 2006 08:09:00 -0000
From: "guanglei at cn dot ibm dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sources.redhat.com
Message-ID: <20060809080930.3016.guanglei@cn.ibm.com>
Reply-To: sourceware-bugzilla@sourceware.org
Subject: [Bug translator/3016] New: error accessing anonymous struct/union memeber
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stap works fine with this script:

probe kernel.function("do_mpage_readpage")
{
  printf("%p", $page)
}

But it will generate an error with this script:

probe kernel.function("do_mpage_readpage")
{
        printf("%p", $page->mapping) 
}

stap -vv says:
...
Pass 1: parsed user script and 40 library script(s) in 310usr/0sys/372real ms.
probe do_mpage_readpage@fs/mpage.c:179 pc=0xc0000000000e716c
semantic error: unresolved target-symbol expression: identifier '$page' at
b.stp:3:15
...

The struct page is defined in "include/linux/mm.h" and mapping is an anonymous
struct member of struct page:

struct page {
      unsigned long flags;
      atomic_t _count; 
      atomic_t _mapcount; 
      union {
          struct {
              unsigned long private;
              struct address_space *mapping;
          };
      ...
}

-- 
           Summary: error accessing anonymous struct/union memeber
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: guanglei at cn dot ibm dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=3016

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