[xmlvm-users] Another Crash in XMLVM generated source...

[Markus H. <ma...@ti...>]

Hi again,

got another crash. This time it's really weird I think. It works on the Simulator, but crashes on the device. Problem is, I can't construct an easy Test case that demonstrates it...

//_stack has a size of 6
    _stack[_sp++].i = _op1.i;
//sp==6 here
    _stack[_sp++].o = _locals[0].o;
//sp==7 here on simulator, but on the iPhone its some value like 3390961
    _op1.o = _stack[--_sp].o;
//crash here on the device obviously. If I put a breakpoint here and change _sp to 7, all is fine.

If I change the size of _stack to 7, its also not crashing. 

But changing it to
    _stack[_sp++].i = _op1.i;
    _stack[_sp].o = _locals[0].o;
    _op1.o = _stack[_sp].o;
does crash.

I have no clue what is causing it. Maybe you can see something or have an idea. As I daid I couldn't construct a simple test, so I here is the complete generated method:

- (void) run__
{
    XMLVMElem _stack[6];
    XMLVMElem _locals[4];
    int _sp = 0;
    XMLVMElem _op1, _op2, _op3;
    NSAutoreleasePool* _pool = [[NSAutoreleasePool alloc] init];
    _locals[0].o = self;
    label4:;
    _stack[_sp++].o = _locals[0].o;
    _op1.o = _stack[--_sp].o;
    _op2.o = [((javax_microedition_lcdui_Display_TickerPaintTask*) _op1.o)  _GET_this_0];
    _stack[_sp++].o = _op2.o;
    _sp -= 1;
    _op1.o = [javax_microedition_lcdui_Display access$000___javax_microedition_lcdui_Display:_stack[_sp + 0].o];
    [_op1.o autorelease];
    _stack[_sp++].o = _op1.o;
    _op1.o = _stack[--_sp].o;
    if (_op1.o == [NSNull null]) goto label0;
    _stack[_sp++].o = _locals[0].o;
    _op1.o = _stack[--_sp].o;
    _op2.o = [((javax_microedition_lcdui_Display_TickerPaintTask*) _op1.o)  _GET_this_0];
    _stack[_sp++].o = _op2.o;
    _sp -= 1;
    _op1.o = [javax_microedition_lcdui_Display access$000___javax_microedition_lcdui_Display:_stack[_sp + 0].o];
    [_op1.o autorelease];
    _stack[_sp++].o = _op1.o;
    _sp -= 1;
    _op1.o = [((javax_microedition_lcdui_Displayable*) _stack[_sp].o) getTicker__];
    [_op1.o autorelease];
    _stack[_sp++].o = _op1.o;
    _op1.o = _stack[--_sp].o;
    _locals[1].o = _op1.o;
    label6:;
    _stack[_sp++].o = _locals[1].o;
    _op1.o = _stack[--_sp].o;
    if (_op1.o == [NSNull null]) goto label0;
    _stack[_sp++].o = _locals[1].o;
    _op1 = _stack[_sp - 1];
    _stack[_sp++] = _op1;
    _op1.o = _stack[--_sp].o;
    _locals[2].o = _op1.o;
    _op1.o = _stack[--_sp].o;
  	@synchronized(_op1.o) {
    }
      @try {
    _stack[_sp++].o = _locals[1].o;
    _op1.o = _stack[--_sp].o;
    _op2.i = [((javax_microedition_lcdui_Ticker*) _op1.o)  _GET_resetTextPosTo];
    _stack[_sp++].i = _op2.i;
    _stack[_sp++].i = -1;
    _op2.i = _stack[--_sp].i;
    _op1.i = _stack[--_sp].i;
    if (_op1.i == _op2.i) goto label2;
    _stack[_sp++].o = _locals[1].o;
    _stack[_sp++].o = _locals[1].o;
    _op1.o = _stack[--_sp].o;
    _op2.i = [((javax_microedition_lcdui_Ticker*) _op1.o)  _GET_resetTextPosTo];
    _stack[_sp++].i = _op2.i;
    _op1.i = _stack[--_sp].i;
    _op2.o = _stack[--_sp].o;
    [((javax_microedition_lcdui_Ticker*) _op2.o) _PUT_textPos: _op1.i];
    _stack[_sp++].o = _locals[1].o;
    _stack[_sp++].i = -1;
    _op1.i = _stack[--_sp].i;
    _op2.o = _stack[--_sp].o;
    [((javax_microedition_lcdui_Ticker*) _op2.o) _PUT_resetTextPosTo: _op1.i];
    label2:;
    _stack[_sp++].o = _locals[1].o;
    _op1 = _stack[_sp - 1];
    _stack[_sp++] = _op1;
    _op1.o = _stack[--_sp].o;
    _op2.i = [((javax_microedition_lcdui_Ticker*) _op1.o)  _GET_textPos];
    _stack[_sp++].i = _op2.i;
    _op1.i = [javax_microedition_lcdui_Ticker _GET_PAINT_MOVE];
    _stack[_sp++].i = _op1.i;
    _op2.i = _stack[--_sp].i;
    _op1.i = _stack[--_sp].i;
    _stack[_sp++].i = _op1.i - _op2.i;    _op1.i = _stack[--_sp].i;
    _op2.o = _stack[--_sp].o;
    [((javax_microedition_lcdui_Ticker*) _op2.o) _PUT_textPos: _op1.i];
    _stack[_sp++].o = _locals[2].o;
    } @catch (java_lang_Exception* _ex) {
        _stack[_sp++].o = _ex;
        goto label8;
    }
    goto label3;
    label8:;
    @try {
    _op1.o = _stack[--_sp].o;
    _locals[3].o = _op1.o;
    _stack[_sp++].o = _locals[2].o;
    } @catch (java_lang_Exception* _ex) {
        _stack[_sp++].o = _ex;
        goto label8;
    }
    _stack[_sp++].o = _locals[3].o;
    _op1.o = _stack[--_sp].o;
    @throw _op1.o;
    label3:;
    _stack[_sp++].o = _locals[0].o;
    _op1.o = _stack[--_sp].o;
    _op2.o = [((javax_microedition_lcdui_Display_TickerPaintTask*) _op1.o)  _GET_this_0];
    _stack[_sp++].o = _op2.o;
    _stack[_sp++].o = _locals[0].o;
    _op1.o = _stack[--_sp].o;
    _op2.o = [((javax_microedition_lcdui_Display_TickerPaintTask*) _op1.o)  _GET_this_0];
    _stack[_sp++].o = _op2.o;
    _sp -= 1;
    _op1.o = [javax_microedition_lcdui_Display access$000___javax_microedition_lcdui_Display:_stack[_sp + 0].o];
    [_op1.o autorelease];
    _stack[_sp++].o = _op1.o;
    _stack[_sp++].i = 0;
    _stack[_sp++].i = 0;
    _stack[_sp++].o = _locals[0].o;
    _op1.o = _stack[--_sp].o;
    _op2.o = [((javax_microedition_lcdui_Display_TickerPaintTask*) _op1.o)  _GET_this_0];
    _stack[_sp++].o = _op2.o;
    _sp -= 1;
    _op1.o = [javax_microedition_lcdui_Display access$000___javax_microedition_lcdui_Display:_stack[_sp + 0].o];
    [_op1.o autorelease];
    _stack[_sp++].o = _op1.o;
    _sp -= 1;
    _op1.i = [((javax_microedition_lcdui_Displayable*) _stack[_sp].o) getWidth__];
//start
    _stack[_sp++].i = _op1.i;
    _stack[_sp++].o = _locals[0].o;
    _op1.o = _stack[--_sp].o;
//end
    _op2.o = [((javax_microedition_lcdui_Display_TickerPaintTask*) _op1.o)  _GET_this_0];
    _stack[_sp++].o = _op2.o;
    _sp -= 1;
    _op1.o = [javax_microedition_lcdui_Display access$000___javax_microedition_lcdui_Display:_stack[_sp + 0].o];
    [_op1.o autorelease];
    _stack[_sp++].o = _op1.o;
    _sp -= 1;
    _op1.i = [((javax_microedition_lcdui_Displayable*) _stack[_sp].o) getHeight__];
    _stack[_sp++].i = _op1.i;
    _sp -= 6;
    [((javax_microedition_lcdui_Display*) _stack[_sp].o) repaint___javax_microedition_lcdui_Displayable_int_int_int_int:_stack[_sp + 1].o:_stack[_sp + 2].i:_stack[_sp + 3].i:_stack[_sp + 4].i:_stack[_sp + 5].i];
    label0:;
    [_pool release];
    return;
}