Overview
Artifact ID: | 642a31d68752d779d964b7ef17f9b1a84abb69c0 |
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Ticket: | cac46925857f9928049828bc2e1552aa3842d2bd
Revised [text]: assertion failed in tkTextDisp.c:7191 |
User & Date: | fvogel 2017-08-20 19:52:30 |
Changes
- comment changed to:
Revised [text]: assertion failed in tkTextDisp.c:7191 Happens in TkTextUpdateLineMetrics(): <verbatim> assert(lineNum <= endLine); </verbatim> Breakpointing at this place just before the assertion, one gets the following call stack: <verbatim> > tk87tg.dll!TkTextUpdateLineMetrics(TkText * textPtr=0x03498e40, unsigned int lineNum=106, unsigned int endLine=106) Line 7192 C tk87tg.dll!UpdateLineMetrics(TkText * textPtr=0x03498e40, unsigned int startLine=106, unsigned int endLine=106) Line 1253 + 0x11 bytes C tk87tg.dll!TextWidgetObjCmd(void * clientData=0x03498e40, Tcl_Interp * interp=0x006e2270, int objc=6, Tcl_Obj * const * objv=0x006e6728) Line 1873 + 0x17 bytes C tcl87tg.dll!Dispatch(void * * data=0x03bf62cc, Tcl_Interp * interp=0x006e2270, int result=0) Line 4376 + 0x15 bytes C tcl87tg.dll!TclNRRunCallbacks(Tcl_Interp * interp=0x006e2270, int result=0, NRE_callback * rootPtr=0x00000000) Line 4409 + 0x14 bytes C tcl87tg.dll!Tcl_EvalObjv(Tcl_Interp * interp=0x006e2270, int objc=3, Tcl_Obj * const * objv=0x006e64d0, int flags=2097168) Line 4139 + 0x11 bytes C tcl87tg.dll!TclEvalEx(Tcl_Interp * interp=0x006e2270, const char * script=0x034e3a40, int numBytes=109, int flags=131072, int line=1, int * clNextOuter=0x00000000, const char * outerScript=0x034e3a40) Line 5279 + 0x16 bytes C tcl87tg.dll!Tcl_EvalEx(Tcl_Interp * interp=0x006e2270, const char * script=0x034e3a40, int numBytes=109, int flags=131072) Line 4943 + 0x1d bytes C tk87tg.dll!Tk_BindEvent(Tk_BindingTable_ * bindPtr=0x00730378, _XEvent * eventPtr=0x032e8858, Tk_Window_ * tkwin=0x0337a5a0, int numObjects=0, void * * objectPtr=0x002bfb84) Line 1505 + 0x27 bytes C tk87tg.dll!TkBindEventProc(TkWindow * winPtr=0x0337a5a0, _XEvent * eventPtr=0x032e8858) Line 317 + 0x1f bytes C tk87tg.dll!Tk_HandleEvent(_XEvent * eventPtr=0x032e8858) Line 1374 + 0xd bytes C tk87tg.dll!WindowEventProc(Tcl_Event * evPtr=0x032e8850, int flags=-3) Line 1764 + 0xc bytes C tcl87tg.dll!Tcl_ServiceEvent(int flags=-3) Line 670 + 0xd bytes C tcl87tg.dll!Tcl_DoOneEvent(int flags=-3) Line 967 + 0x9 bytes C tk87tg.dll!Tk_MainLoop() Line 2148 + 0x11 bytes C tk87tg.dll!Tk_MainExW(int argc=-1, unsigned short * * argv=0x003b32d8, int (Tcl_Interp *)* appInitProc=0x004010e0, Tcl_Interp * interp=0x006e2270) Line 391 C wish87tg.exe!wWinMain(HINSTANCE__ * hInstance=0x00400000, HINSTANCE__ * hPrevInstance=0x00000000, unsigned short * lpszCmdLine=0x006a16b6, int nCmdShow=10) Line 150 + 0x39 bytes C wish87tg.exe!__tmainCRTStartup() Line 574 + 0x35 bytes C wish87tg.exe!wWinMainCRTStartup() Line 399 C kernel32.dll!7642f964() [Frames below may be incorrect and/or missing, no symbols loaded for kernel32.dll] ntdll.dll!7703e369() ntdll.dll!7703e57b() </verbatim> This shows that the command currently executed was ".text count -update -ypixels", with the "indexFrom" and "indexTo" being identical, which triggers the assertion. The call to: <verbatim> UpdateLineMetrics(textPtr, from, to); </verbatim> in tkText.c:1873 surely does not need to be done if (indexFrom == indexTo) Perhaps adding this test would be enough to fix the issue. This is fully repeatable in my application. I can try to produce a short demo script if needed.
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