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174 lines
6.9 KiB
Plaintext
174 lines
6.9 KiB
Plaintext
*debug.txt* Nvim
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VIM REFERENCE MANUAL by Bram Moolenaar
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Debugging Vim *debug-vim*
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This is for debugging Vim itself, when it doesn't work properly.
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For debugging Vim scripts, functions, etc. see |debug-scripts|
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Type |gO| to see the table of contents.
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==============================================================================
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1. Location of a crash, using gcc and gdb *debug-gcc* *gdb*
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When Vim crashes in one of the test files, and you are using gcc for
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compilation, here is what you can do to find out exactly where Vim crashes.
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This also applies when using the MingW tools.
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1. Compile Vim with the "-g" option (there is a line in the src/Makefile for
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this, which you can uncomment). Also make sure "strip" is disabled (do not
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install it, or use the line "STRIP = /bin/true").
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2. Execute these commands (replace "11" with the test that fails): >
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cd testdir
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gdb ../vim
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run -u unix.vim -U NONE -s dotest.in test11.in
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3. Check where Vim crashes, gdb should give a message for this.
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4. Get a stack trace from gdb with this command: >
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where
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< You can check out different places in the stack trace with: >
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frame 3
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< Replace "3" with one of the numbers in the stack trace.
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==============================================================================
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2. Locating memory leaks *debug-leaks* *valgrind*
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If you suspect Vim is leaking memory and you are using Linux, the valgrind
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tool is very useful to pinpoint memory leaks.
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First of all, build Vim with EXITFREE defined. Search for this in MAKEFILE
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and uncomment the line.
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Use this command to start Vim:
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>
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valgrind --log-file=valgrind.log --leak-check=full ./vim
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Note: Vim will run much slower. If your vimrc is big or you have several
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plugins you need to be patient for startup, or run with the "-u NONE"
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argument.
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There are often a few leaks from libraries, such as getpwuid() and
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XtVaAppCreateShell(). Those are unavoidable. The number of bytes should be
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very small a Kbyte or less.
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==============================================================================
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3. Windows Bug Reporting *debug-win32*
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If the Windows version of Vim crashes in a reproducible manner, you can take
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some steps to provide a useful bug report.
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3.1 GENERIC ~
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You must obtain the debugger symbols (PDB) file for your executable: gvim.pdb
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for gvim.exe, or vim.pdb for vim.exe. The PDB should be available from the
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same place that you obtained the executable. Be sure to use the PDB that
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matches the EXE (same date).
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If you built the executable yourself with the Microsoft Visual C++ compiler,
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then the PDB was built with the EXE.
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Alternatively, if you have the source files, you can import Make_ivc.mak into
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Visual Studio as a workspace. Then select a debug configuration, build and
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you can do all kinds of debugging (set breakpoints, watch variables, etc.).
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If you have Visual Studio, use that instead of the VC Toolkit and WinDbg.
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For other compilers, you should always use the corresponding debugger: TD for
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a Vim executable compiled with the Borland compiler; gdb (see above
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|debug-gcc|) for the Cygwin and MinGW compilers.
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*debug-vs2005*
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3.2 Debugging Vim crashes with Visual Studio 2005/Visual C++ 2005 Express ~
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First launch vim.exe or gvim.exe and then launch Visual Studio. (If you don't
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have Visual Studio, follow the instructions at |get-ms-debuggers| to obtain a
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free copy of Visual C++ 2005 Express Edition.)
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On the Tools menu, click Attach to Process. Choose the Vim process.
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In Vim, reproduce the crash. A dialog will appear in Visual Studio, telling
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you about the unhandled exception in the Vim process. Click Break to break
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into the process.
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Visual Studio will pop up another dialog, telling you that no symbols are
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loaded and that the source code cannot be displayed. Click OK.
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Several windows will open. Right-click in the Call Stack window. Choose Load
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Symbols. The Find Symbols dialog will open, looking for (g)vim.pdb. Navigate
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to the directory where you have the PDB file and click Open.
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At this point, you should have a full call stack with vim function names and
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line numbers. Double-click one of the lines and the Find Source dialog will
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appear. Navigate to the directory where the Vim source is (if you have it.)
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If you don't know how to debug this any further, follow the instructions
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at ":help bug-reports". Paste the call stack into the bug report.
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If you have a non-free version of Visual Studio, you can save a minidump via
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the Debug menu and send it with the bug report. A minidump is a small file
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(<100KB), which contains information about the state of your process.
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Visual C++ 2005 Express Edition cannot save minidumps and it cannot be
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installed as a just-in-time debugger. Use WinDbg, |debug-windbg|, if you
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need to save minidumps or you want a just-in-time (postmortem) debugger.
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*debug-windbg*
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3.3 Debugging Vim crashes with WinDbg ~
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See |get-ms-debuggers| to obtain a copy of WinDbg.
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As with the Visual Studio IDE, you can attach WinDbg to a running Vim process.
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You can also have your system automatically invoke WinDbg as a postmortem
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debugger. To set WinDbg as your postmortem debugger, run "windbg -I".
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To attach WinDbg to a running Vim process, launch WinDbg. On the File menu,
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choose Attach to a Process. Select the Vim process and click OK.
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At this point, choose Symbol File Path on the File menu, and add the folder
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containing your Vim PDB to the sympath. If you have Vim source available,
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use Source File Path on the File menu. You can now open source files in WinDbg
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and set breakpoints, if you like. Reproduce your crash. WinDbg should open the
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source file at the point of the crash. Using the View menu, you can examine
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the call stack, local variables, watch windows, and so on.
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If WinDbg is your postmortem debugger, you do not need to attach WinDbg to
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your Vim process. Simply reproduce the crash and WinDbg will launch
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automatically. As above, set the Symbol File Path and the Source File Path.
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To save a minidump, type the following at the WinDbg command line: >
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.dump vim.dmp
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<
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*debug-minidump*
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3.4 Opening a Minidump ~
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If you have a minidump file, you can open it in Visual Studio or in WinDbg.
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In Visual Studio 2005: on the File menu, choose Open, then Project/Solution.
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Navigate to the .dmp file and open it. Now press F5 to invoke the debugger.
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Follow the instructions in |debug-vs2005| to set the Symbol File Path.
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In WinDbg: choose Open Crash Dump on the File menu. Follow the instructions in
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|debug-windbg| to set the Symbol File Path.
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*get-ms-debuggers*
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3.5 Obtaining Microsoft Debugging Tools ~
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The Debugging Tools for Windows (including WinDbg) can be downloaded from
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http://www.microsoft.com/whdc/devtools/debugging/default.mspx
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This includes the WinDbg debugger.
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Visual C++ 2005 Express Edition can be downloaded for free from:
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http://msdn.microsoft.com/vstudio/express/visualC/default.aspx
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=========================================================================
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vim:tw=78:ts=8:ft=help:norl:
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