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  1. #1
    Registered User
    Join Date
    Jul 2012
    Location
    Brno, Czech Republic
    Posts
    16

    on-device debugging stops while my app is running

    Hi,

    I'm trying to debug my app, which crashes suddenly. However, on the following code the debugger is behaving weirdly:
    Code:
    IndexEntry DictEngine::readLineIE()
    {
    	QStringList strl = streamIndex->readLine().split("\t");
    	IndexEntry ie;
    	ie.heading = strl[0];
    	ie.dictPos = base64toInt(strl[1]);
    	ie.length = base64toInt(strl[2]);
    	return ie;
    }
    Where the class IndexEntry is defined as follows:
    Code:
    class IndexEntry {
    public:
    	IndexEntry() { heading = ""; dictPos = 0; length = 0; }
    	QString heading;
    	qint64 dictPos;
    	qint64 length;
    };
    When I step through the first line (where QStringList instance is created), everything is OK, I can see the values of strl in watch window, which are as expected.
    However, when I step through lines 3-6, I realize, that the member variables of ie contain some random values, although they should have been assigned values from strl. After line 6 (assignment of ie.length) the yellow arrow disappears and debugging ends.

    It's a pity I can't attach a text file to this post. I could attach the debugger log. So at least I'm sending a couple of last lines from it:

    <63-stack-select-frame 0
    <64disassemble 0x80484ab8
    <65bb options:fancy,autoderef vars: expanded:local.ie.heading,local.strl,local.ie typeformats: formats: watchers:
    >63^done
    >&"disassemble 0x80484ab8\n"
    >&"No function contains specified address.\n"
    >64^error,msg="No function contains specified address."
    <66disassemble 0x80484aa4,0x80484b1c
    >&"bb options:fancy,autoderef vars: expanded:local.ie.heading,local.strl,local.ie typeformats: formats: watchers:\n"
    >~"XXX: BLOCK IN FRAME NOT ACCESSIBLE: Cannot locate object file for block.\n"
    >~"\n"
    >~"data=[,],typeinfo=[]\n"
    >65^done
    dDISCARDING JUNK AT BEGIN OF RESPONSE: XXX: BLOCK IN FRAME NOT ACCESSIBLE: Cannot locate object file for block.
    d
    d
    <Rebuild Watchmodel 10>
    sFinished retrieving data
    >&"disassemble 0x80484aa4,0x80484b1c\n"
    >~"Dump of assembler code from 0x80484aa4 to 0x80484b1c:\n"
    >~" 0x80484aa4:\t"
    >&"Cannot access memory at address 0x80484ab8\n"
    >66^error,msg="Cannot access memory at address 0x80484ab8"
    sDisassembler failed: Cannot access memory at address 0x80484ab8

  2. #2
    Registered User
    Join Date
    Jul 2012
    Location
    Brno, Czech Republic
    Posts
    16

    Re: on-device debugging stops while my app is running

    I apologize, I realized I had a bug in my function base64toInt(), so the member variables of ie were not assigned any meaningful value.
    However, I still don't understand why the watch window displays ie.heading as empty even after the assignment on line 3 of readLineIE().

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