[Octave-bug-tracker] [bug #35154] Memory leak and odd behavior with eval() on development tip

[Rik]

URL:
  <http://savannah.gnu.org/bugs/?35154>

                 Summary: Memory leak and odd behavior with eval() on
development tip
                 Project: GNU Octave
            Submitted by: rik5
            Submitted on: Thu 22 Dec 2011 12:59:09 PM PST
                Category: Interpreter
                Severity: 4 - Important
                Priority: 5 - Normal
              Item Group: Performance
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

I've discovered some odd behavior with eval().

First, there is a memory leak caught by valgrind with this simple code.


eval("switch 1 default 1; endswitch")


I have attached the valgrind log.

The second issue, which may be related to the memory leak, is that eval()
appears to evaluate the code twice if an error condition is found.

For example:


octave:3> x = eval ('1b*0')
parse error:

  syntax error

>>> 1b*0
     ^

parse error:

  syntax error

>>> 1b*0
    ^



This looks to be related to parsing because it depends on the operation
involved (+,-,/,*) and whether it is the final parse unit which returns an
error.

More sample code:


octave:3> x = eval ('0*1b')
parse error:

  syntax error

>>> 0*1b
       ^



In this case there is only one parse error when the problem parse unit comes
second.  Similarly, 


octave:3> x = eval ('1b+0')
parse error:

  syntax error

>>> 1b+0
     ^



displays only one error because the operation has been changed from '*' to
'+'.

This is all very strange.




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File Attachments:


-------------------------------------------------------
Date: Thu 22 Dec 2011 12:59:09 PM PST  Name: valgrind.log  Size: 37kB   By:
rik5

<http://savannah.gnu.org/bugs/download.php?file_id=24652>

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