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1 *debug.txt* For Vim version 7.1. Last change: 2006 May 01
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4 VIM REFERENCE MANUAL by Bram Moolenaar
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5
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6
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7 Debugging Vim *debug-vim*
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8
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9 This is for debugging Vim itself, when it doesn't work properly.
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10 For debugging Vim scripts, functions, etc. see |debug-scripts|
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11
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12 1. Location of a crash, using gcc and gdb |debug-gcc|
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13 2. Windows Bug Reporting |debug-win32|
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14
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15 ==============================================================================
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16
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17 1. Location of a crash, using gcc and gdb *debug-gcc*
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18
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19 When Vim crashes in one of the test files, and you are using gcc for
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20 compilation, here is what you can do to find out exactly where Vim crashes.
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21 This also applies when using the MingW tools.
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22
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23 1. Compile Vim with the "-g" option (there is a line in the Makefile for this,
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24 which you can uncomment).
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25
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26 2. Execute these commands (replace "11" with the test that fails): >
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27 cd testdir
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28 gdb ../vim
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29 run -u unix.vim -U NONE -s dotest.in test11.in
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30
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31 3. Check where Vim crashes, gdb should give a message for this.
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32
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33 4. Get a stack trace from gdb with this command: >
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34 where
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35 < You can check out different places in the stack trace with: >
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36 frame 3
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37 < Replace "3" with one of the numbers in the stack trace.
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38
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39 ==============================================================================
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40
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41 2. Windows Bug Reporting *debug-win32*
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42
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43 If the Windows version of Vim crashes in a reproducible manner, you can take
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44 some steps to provide a useful bug report.
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45
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46
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47 GENERIC ~
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48
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49 You must obtain the debugger symbols (PDB) file for your executable: gvim.pdb
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50 for gvim.exe, or vim.pdb for vim.exe. The PDB should be available from the
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51 same place that you obtained the executable. Be sure to use the PDB that
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52 matches the EXE (same date).
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53
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54 If you built the executable yourself with the Microsoft Visual C++ compiler,
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55 then the PDB was built with the EXE.
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56
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57 Alternatively, if you have the source files, you can import Make_ivc.mak into
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58 Visual Studio as a workspace. Then select a debug configuration, build and
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59 you can do all kinds of debugging (set breakpoints, watch variables, etc.).
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60
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61 If you have Visual Studio, use that instead of the VC Toolkit and WinDbg.
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62
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63 For other compilers, you should always use the corresponding debugger: TD for
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64 a Vim executable compiled with the Borland compiler; gdb (see above
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65 |debug-gcc|) for the Cygwin and MinGW compilers.
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66
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67
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68 *debug-vs2005*
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69 2.2 Debugging Vim crashes with Visual Studio 2005/Visual C++ 2005 Express ~
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70
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71 First launch vim.exe or gvim.exe and then launch Visual Studio. (If you don't
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72 have Visual Studio, follow the instructions at |get-ms-debuggers| to obtain a
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73 free copy of Visual C++ 2005 Express Edition.)
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74
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75 On the Tools menu, click Attach to Process. Choose the Vim process.
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76
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77 In Vim, reproduce the crash. A dialog will appear in Visual Studio, telling
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78 you about the unhandled exception in the Vim process. Click Break to break
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79 into the process.
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80
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81 Visual Studio will pop up another dialog, telling you that no symbols are
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82 loaded and that the source code cannot be displayed. Click OK.
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83
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84 Several windows will open. Right-click in the Call Stack window. Choose Load
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85 Symbols. The Find Symbols dialog will open, looking for (g)vim.pdb. Navigate
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86 to the directory where you have the PDB file and click Open.
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87
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88 At this point, you should have a full call stack with vim function names and
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89 line numbers. Double-click one of the lines and the Find Source dialog will
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90 appear. Navigate to the directory where the Vim source is (if you have it.)
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91
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92 If you don't know how to debug this any further, follow the instructions
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93 at ":help bug-reports". Paste the call stack into the bug report.
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94
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95 If you have a non-free version of Visual Studio, you can save a minidump via
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96 the Debug menu and send it with the bug report. A minidump is a small file
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97 (<100KB), which contains information about the state of your process.
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98 Visual C++ 2005 Express Edition cannot save minidumps and it cannot be
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99 installed as a just-in-time debugger. Use WinDbg, |debug-windbg|, if you
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100 need to save minidumps or you want a just-in-time (postmortem) debugger.
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101
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102 *debug-windbg*
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103 2.3 Debugging Vim crashes with WinDbg ~
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104
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105 See |get-ms-debuggers| to obtain a copy of WinDbg.
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106
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107 As with the Visual Studio IDE, you can attach WinDbg to a running Vim process.
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108 You can also have your system automatically invoke WinDbg as a postmortem
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109 debugger. To set WinDbg as your postmortem debugger, run "windbg -I".
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110
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111 To attach WinDbg to a running Vim process, launch WinDbg. On the File menu,
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112 choose Attach to a Process. Select the Vim process and click OK.
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113
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114 At this point, choose Symbol File Path on the File menu, and add the folder
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115 containing your Vim PDB to the sympath. If you have Vim source available,
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116 use Source File Path on the File menu. You can now open source files in WinDbg
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117 and set breakpoints, if you like. Reproduce your crash. WinDbg should open the
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118 source file at the point of the crash. Using the View menu, you can examine
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119 the call stack, local variables, watch windows, and so on.
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120
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121 If WinDbg is your postmortem debugger, you do not need to attach WinDbg to
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122 your Vim process. Simply reproduce the crash and WinDbg will launch
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123 automatically. As above, set the Symbol File Path and the Source File Path.
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124
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125 To save a minidump, type the following at the WinDbg command line: >
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126 .dump vim.dmp
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127 <
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128 *debug-minidump*
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129 2.4 Opening a Minidump ~
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130
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131 If you have a minidump file, you can open it in Visual Studio or in WinDbg.
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132
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133 In Visual Studio 2005: on the File menu, choose Open, then Project/Solution.
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134 Navigate to the .dmp file and open it. Now press F5 to invoke the debugger.
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135 Follow the instructions in |debug-vs2005| to set the Symbol File Path.
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136
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137 In WinDbg: choose Open Crash Dump on the File menu. Follow the instructions in
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138 |debug-windbg| to set the Symbol File Path.
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139
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140 *get-ms-debuggers*
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141 2.5 Obtaining Microsoft Debugging Tools ~
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142
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143 The Debugging Tools for Windows (including WinDbg) can be downloaded from
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144 http://www.microsoft.com/whdc/devtools/debugging/default.mspx
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145 This includes the WinDbg debugger.
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146
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147 Visual C++ 2005 Express Edition can be downloaded for free from:
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148 http://msdn.microsoft.com/vstudio/express/visualC/default.aspx
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149
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150 =========================================================================
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151 vim:tw=78:ts=8:ft=help:norl:
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