Re: [Flex-help] memory leaks even after yy_delete_buffer(YY_CURRENT_BUFFER)

[Lorenzo B. <be...@ds...>]

Hi Paul

as far as I understand this patch is for C++ scanner, while in my case
it's a C scanner, or am I missing something?

thanks
	Lore

Paul Swoboda wrote:
> Hey Lorenzo,
>  
> "Yuri" sent me this, and it cured that exact leak nicely:
>  
> -----------------------------
>  
> That is true! I've submited that in
> http://sourceforge.net/mailarchive/forum.php?thread_id=31561058&forum_id=39108
> <http://sourceforge.net/mailarchive/forum.php?thread_id=31561058&forum_id=39108>.
> You should edit the file flex.skl to add missing string and recompile
> your copy of flex.
>  
> -----------------------------
>  
> Regards,
>  
> Paul
> 
>  
> On 3/23/07, *Lorenzo Bettini* <be...@ds...
> <mailto:be...@ds...>> wrote:
> 
>     Hi
> 
>     I'm using flex version 2.5.31 and I was experiencing some memory leaks
>     (using valgrind); actually they were still reachable bytes (16438
>     bytes).
> 
>     After checking the manual,
>     http://flex.sourceforge.net/manual/Memory-leak-_002d-16386-bytes-allocated-by-malloc_002e.html#Memory-leak-_002d-16386-bytes-allocated-by-malloc_002e
>     <http://flex.sourceforge.net/manual/Memory-leak-_002d-16386-bytes-allocated-by-malloc_002e.html#Memory-leak-_002d-16386-bytes-allocated-by-malloc_002e>
> 
>     I added this rule in the scanner
> 
>     <<EOF>> {
>     /* For non-reentrant C scanner only. */
>     yy_delete_buffer(YY_CURRENT_BUFFER);
> 
>     yyterminate();
>     }
> 
>     however, there are still 4 bytes still reachable:
> 
>     ==31245== 4 bytes in 1 blocks are still reachable in loss record 1 of 3
>     ==31245==    at 0x4021618: malloc (in
>     /usr/lib/valgrind/x86-linux/vgpreload_memcheck.so)
>     ==31245==    by 0x8069B72: stylesc_alloc(unsigned) (
>     stylescanner.cc:1909)
>     ==31245==    by 0x8069BED: stylesc_ensure_buffer_stack()
>     (stylescanner.cc:1646)
>     ==31245==    by 0x806A98B: stylesc_lex() (stylescanner.cc:753)
>     ==31245==    by 0x8066F67: stylesc_parse() ( styleparser.cc:1344)
>     ==31245==    by 0x8067F60: parseStyles(std::string const&, std::string
>     const&) (styleparser.yy:177)
>     ==31245==    by 0x80505FB: StartApp::start(int, char**)
>     (startapp.cc:300)
>     ==31245==    by 0x8055892: main ( source-highlight.cc:26)
> 
>     am I still missing something?
> 


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Lorenzo Bettini, PhD in Computer Science, DSI, Univ. di Firenze
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