winedbg: output of the bt command misses sometimes a frame

Bernhard Übelacker bernhardu at vr-web.de
Sat Feb 6 04:46:53 CST 2010


Hello,
as I was debugging in wine I wondered if following behaviour is intended or
could be considered a bug (and should be filed in bugtracker?).

When the debugger's current position is on the opening curly bracket of a
function a "bt" command writes a different stack as if the current position
is on the next instruction in this function.

What me makes wonder is the frame 0 is always correct but the calling
function is not in the stack at all in the first bt:


Wine-dbg>bt
Backtrace:
=>0 0x7ebe3622 IsWindow(hwnd=0x20060) [/home/bernhard/data/entwicklung/2010/wine/wine-git/dlls/user32/win.c:2503] in user32 (0x0033b500)
  1 0x7e25429d create_window16+0x5c(cs=0x33b53c, className="QWidget", instance=0x400000, unicode=1) [/home/bernhard/data/entwicklung/2010/wine/wine-git/dlls/user.exe16/message.c:2670] in user.exe16 (0x0033b520)
  2 0x7ebe0f91 CreateWindowExW+0x7e(exStyle=1024, className="QWidget", windowName="pica", style=114032640, x=-2147483648, y=-2147483648, width=-2147483648, height=-2147483648, parent=(nil), menu=(nil), instance=0x400000, data=0x0(nil)) [/home/bernhard/data/entwicklung/2010/wine/wine-git/dlls/user32/win.c:1500] in user32 (0x0033b570)
  3 0x650778f3 in qtgui4 (+0x778f3) (0x80000000)


Wine-dbg>next
2507        if (!(ptr = WIN_GetPtr( hwnd ))) return FALSE;


Wine-dbg>bt
Backtrace:
=>0 0x7ebe3637 IsWindow+0x15(hwnd=0x20060) [/home/bernhard/data/entwicklung/2010/wine/wine-git/dlls/user32/win.c:2507] in user32 (0x0033b2b0)
  1 0x7ebe0bda WIN_CreateWindowEx+0x1201(cs=0x33b53c, className="QWidget", module=0x400000, unicode=1) [/home/bernhard/data/entwicklung/2010/wine/wine-git/dlls/user32/win.c:1406] in user32 (0x0033b500)
  2 0x7e25429d create_window16+0x5c(cs=0x33b53c, className="QWidget", instance=0x400000, unicode=1) [/home/bernhard/data/entwicklung/2010/wine/wine-git/dlls/user.exe16/message.c:2670] in user.exe16 (0x0033b520)
  3 0x7ebe0f91 CreateWindowExW+0x7e(exStyle=1024, className="QWidget", windowName="pica", style=114032640, x=-2147483648, y=-2147483648, width=-2147483648, height=-2147483648, parent=(nil), menu=(nil), instance=0x400000, data=0x0(nil)) [/home/bernhard/data/entwicklung/2010/wine/wine-git/dlls/user32/win.c:1500] in user32 (0x0033b570)
  4 0x650778f3 in qtgui4 (+0x778f3) (0x80000000)


Wine-dbg>


Kind regards
Bernhard



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