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List:       hpux-devtools
Subject:    RE:  HPUX-DEVTOOLS: What is the symbol "$lr_na_4_Alt"
From:       "Cao, Da-Shi \(TSG-SMO-GSS-GZ\)" <thomas-ds.cao () hp ! com>
Date:       2008-04-03 2:31:20
Message-ID: 9564AA8DE605AD4988E8A35515D176B12CC4546180 () G1W0490 ! americas ! hpqcorp ! net
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Hi Masters,
The root cause has been identified, thanks to your opinions.
There is a dead loop, under certain circumstances, in the function calling \
"RemoveHead". I benefit very much from this discussion list.

Thomas

-----Original Message-----
From: Dennis Handly [mailto:dhandly@cup.hp.com]
Sent: Thursday, April 03, 2008 10:06
To: Cao, Da-Shi (TSG-SMO-GSS-GZ)
Cc: hpux-devtools@cxx.cup.hp.com; sieler@allegro.com
Subject: RE: HPUX-DEVTOOLS: What is the symbol "$lr_na_4_Alt"

> From: "Cao, Da-Shi (TSG-SMO-GSS-GZ)" <thomas-ds.cao@hp.com> I can not
> decipher those machine instructions of PA-RISC.

It's pretty easy, the length is 33 bytes.

> I'd appreciate very much if something could be told from the listings

The listings aren't as good as a .i file.

template<class TYPE, class ARG_TYPE>
AFX_INLINE TYPE CListx<TYPE, ARG_TYPE>::RemoveHead() {
    TYPE returnValue = pOldNode->data;
...
    return returnValue; // line 494, where it hang.

So it is copying the 33 byte TYPE struct.  Note this is inefficient, you are copying \
it twice.  You should turn on +nrv. It isn't hanging.  You should do some single \
steps to show you do return to RemoveHead then AppendingResourceReqHandle.

(gdb)  disas 0x47779c-10*4 0x4777b8
;;; File: ../../unixmfc/listx.h Line: 494
0x477774 <CListx<...>::RemoveHead(void)
0x47778c <CRH+0x270>:   ldi 0x21,%r24             len
0x477790 <CRH+0x274>:   ldo -0x53(%sp),%r26       src
0x477794 <CRH+0x278>:   b,l 0x477504,%r31         millicode call
0x477798 <CRH+0x27c>:   copy %r3,%r25             target
0x47779c <CRH+0x280>:   Return from call point

         r3:         7a22a3e0
   arg1/r25:         7a22a400     arg0/r26:         7a22a508
ret1/ap/r29:                1       sp/r30:         7a22a540
    mrp/r31:           47779f     sar/cr11:               38

So R3 is the target.  SP-0x53 is the source.

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