[Bug translator/5634] New: support pointer type punning

[Bug translator/5634] New: support pointer type punning

[fche at redhat dot com]

It would be helpful to have a syntax for pointer type casting,
for times when the static type of the pointer does not match
the dynamic (actual) type.  Currently, this requires embedded-C
code to get around.

Perhaps like this:
    $ptr("struct tcp_socket")->tcp_socket_field

A more C-like syntax would be:
 ((struct tcp_socket*)$ptr)->tcp_socket_field
but parsing that is much more complicated.

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           Summary: support pointer type punning
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: fche at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=5634

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[Bug translator/5634] support pointer type punning

[jkenisto at us dot ibm dot com]

------- Additional Comments From jkenisto at us dot ibm dot com  2008-03-11 18:34 -------
Yes, this would be very useful, whatever the syntax.

In the example given, the pointer is a target variable ($ptr), but it seems
important to be able to cast script variables as well.

-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=5634

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[Bug translator/5634] support pointer type punning

[mhiramat at redhat dot com]

------- Additional Comments From mhiramat at redhat dot com  2008-05-19 21:19 -------
Can this support casting to an array like below?

((struct tcp_socket[])$ptr)[1]->tcp_socket_field

or 

$ptr("struct tcp_socket []")[0]->tcp_socket_field


-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=5634

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[Bug translator/5634] support pointer type punning

[fche at redhat dot com]

------- Additional Comments From fche at redhat dot com  2008-06-27 20:51 -------
*** Bug 6704 has been marked as a duplicate of this bug. ***

-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=5634

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[Bug translator/5634] support pointer type punning

[twoerner at redhat dot com]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
  GCC build triplet|                            |twoerner@redhat.com


http://sourceware.org/bugzilla/show_bug.cgi?id=5634

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[Bug translator/5634] support pointer type punning

[twoerner at redhat dot com]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |twoerner at redhat dot com
  GCC build triplet|twoerner@redhat.com         |


http://sourceware.org/bugzilla/show_bug.cgi?id=5634

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[Bug translator/5634] support pointer type punning

[fche at redhat dot com]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|systemtap at sources dot    |jistone at redhat dot com
                   |redhat dot com              |
             Status|NEW                         |ASSIGNED


http://sourceware.org/bugzilla/show_bug.cgi?id=5634

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