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4<head>
5 <title>How to submit an LLVM bug report</title>
6 <link rel="stylesheet" href="llvm.css" type="text/css">
7</head>
8<body>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]9
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]10<div class="doc_title">
11 How to submit an LLVM bug report
12</div>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]13
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]14<table border="0" width="100%">
15<tr>
16<td valign="top">
17
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]18<ol>
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]19 <li><a href="#introduction">Introduction - Got bugs?</a></li>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]20 <li><a href="#crashers">Crashing Bugs</a>
21 <ul>
22 <li><a href="#front-end">Front-end bugs</a>
23 <li><a href="#gccas">GCCAS bugs</a>
24 <li><a href="#gccld">GCCLD bugs</a>
25 <li><a href="#passes">Bugs in LLVM passes</a>
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]26 </ul></li>
27 <li><a href="#miscompilations">Miscompilations</a></li>
28 <li><a href="#codegen">Incorrect code generation (JIT and LLC)</a></li>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]29
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]30</ol>
31
Misha Brukman637cab02004-01-15 19:03:47 +0000[diff] [blame]32<div class="doc_text">
33 <p><b>Written by <a href="mailto:sabre@nondot.org">Chris Lattner</a> and
34 <a href="http://misha.brukman.net">Misha Brukman</a></b></p>
35</div>
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]36
37</td>
38<td align="right">
Misha Brukman637cab02004-01-15 19:03:47 +0000[diff] [blame]39 <img src="Debugging.gif" alt="Debugging" width="444" height="314">
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]40</td>
41</tr>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]42</table>
43
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]44<!-- *********************************************************************** -->
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]45<div class="doc_section">
46 <a name="introduction">Introduction - Got bugs?</a>
47</div>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]48<!-- *********************************************************************** -->
49
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]50<div class="doc_text">
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]51
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]52<p>If you're working with LLVM and run into a bug, we definitely want to know
53about it. This document describes what you can do to increase the odds of
54getting it fixed quickly.</p>
55
56<p>Basically you have to do two things at a minimum. First, decide whether the
57bug <a href="#crashers">crashes the compiler</a> (or an LLVM pass), or if the
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]58compiler is <a href="#miscompilations">miscompiling</a> the program. Based on
59what type of bug it is, follow the instructions in the linked section to narrow
60down the bug so that the person who fixes it will be able to find the problem
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]61more easily.</p>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]62
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]63<p>Once you have a reduced test-case, go to <a
64href="http://llvm.cs.uiuc.edu/bugs/enter_bug.cgi">the LLVM Bug Tracking
65System</a>, select the category in which the bug falls, and fill out the form
66with the necessary details. The bug description should contain the following
67information:</p>
68
John Criswell4d37c7b2003-10-22 15:06:11 +0000[diff] [blame]69<ul>
Misha Brukmanafac73e2003-10-22 17:01:44 +0000[diff] [blame]70 <li>All information necessary to reproduce the problem.</li>
71 <li>The reduced test-case that triggers the bug.</li>
72 <li>The location where you obtained LLVM (if not from our CVS
73 repository).</li>
John Criswell4d37c7b2003-10-22 15:06:11 +0000[diff] [blame]74</ul>
75
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]76<p>Thanks for helping us make LLVM better!</p>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]77
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]78</div>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]79
80<!-- *********************************************************************** -->
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]81<div class="doc_section">
82 <a name="crashers">Crashing Bugs</a>
83</div>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]84<!-- *********************************************************************** -->
85
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]86<div class="doc_text">
87
88<p>More often than not, bugs in the compiler cause it to crash - often due to an
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]89assertion failure of some sort. If you are running <tt><b>opt</b></tt> or
90<tt><b>analyze</b></tt> directly, and something crashes, jump to the section on
91<a href="#passes">bugs in LLVM passes</a>. Otherwise, the most important
92piece of the puzzle is to figure out if it is the GCC-based front-end that is
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]93buggy or if it's one of the LLVM tools that has problems.</p>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]94
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]95<p>To figure out which program is crashing (the front-end,
96<tt><b>gccas</b></tt>, or <tt><b>gccld</b></tt>), run the
97<tt><b>llvm-gcc</b></tt> command line as you were when the crash occurred, but
98add a <tt>-v</tt> option to the command line. The compiler will print out a
John Criswell79926912004-03-12 20:42:16 +0000[diff] [blame]99bunch of stuff, and should end with telling you that one of
100<tt><b>cc1</b>/<b>cc1plus</b></tt>, <tt><b>gccas</b></tt>, or
101<tt><b>gccld</b></tt> crashed.</p>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]102
103<ul>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]104
John Criswell79926912004-03-12 20:42:16 +0000[diff] [blame]105 <li>If <tt><b>cc1</b></tt> or <tt><b>cc1plus</b></tt> crashed, you found a
106 problem with the front-end.
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]107 Jump ahead to the section on <a href="#front-end">front-end bugs</a>.</li>
108
109 <li>If <tt><b>gccas</b></tt> crashed, you found a bug in <a href="#gccas">one
110 of the passes in <tt><b>gccas</b></tt></a>.</li>
111
112 <li>If <tt><b>gccld</b></tt> crashed, you found a bug in <a href="#gccld">one
113 of the passes in <tt><b>gccld</b></tt></a>.</li>
114
115 <li>Otherwise, something really weird happened. Email the list with what you
116 have at this point.</li>
117
118</ul>
119
120</div>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]121
122<!-- ======================================================================= -->
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]123<div class="doc_subsection">
124 <a name="front-end">Front-end bugs</a>
125</div>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]126
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]127<div class="doc_text">
128
129<p>If the problem is in the front-end, you should re-run the same
Brian Gaekeeefe9792003-05-23 21:03:50 +0000[diff] [blame]130<tt>llvm-gcc</tt> command that resulted in the crash, but add the
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]131<tt>-save-temps</tt> option. The compiler will crash again, but it will leave
132behind a <tt><i>foo</i>.i</tt> file (containing preprocessed C source code) and
133possibly <tt><i>foo</i>.s</tt> (containing LLVM assembly code), for each
134compiled <tt><i>foo</i>.c</tt> file. Send us the <tt><i>foo</i>.i</tt> file,
135along with a brief description of the error it caused.</p>
136
137</div>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]138
139<!-- ======================================================================= -->
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]140<div class="doc_subsection">
141 <a name="gccas">GCCAS bugs</a>
142</div>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]143
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]144<div class="doc_text">
145
146<p>If you find that a bug crashes in the <tt><b>gccas</b></tt> stage of
Brian Gaekeeefe9792003-05-23 21:03:50 +0000[diff] [blame]147compilation, compile your test-case to a <tt>.s</tt> file with the
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]148<tt>-save-temps</tt> option to <tt><b>llvm-gcc</b></tt>. Then run:</p>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]149
Misha Brukmanf4e4feb2004-04-15 20:49:32 +0000[diff] [blame^]150<div class="doc_code">
151<p><tt><b>gccas</b> -debug-pass=Arguments &lt; /dev/null -o - &gt; /dev/null
152</tt></p>
153</div>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]154
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]155<p>... which will print a list of arguments, indicating the list of passes that
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]156<tt><b>gccas</b></tt> runs. Once you have the input file and the list of
157passes, go to the section on <a href="#passes">debugging bugs in LLVM
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]158passes</a>.</p>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]159
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]160</div>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]161
162<!-- ======================================================================= -->
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]163<div class="doc_subsection">
164 <a name="gccld">GCCLD bugs</a>
165</div>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]166
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]167<div class="doc_text">
168
169<p>If you find that a bug crashes in the <tt><b>gccld</b></tt> stage of
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]170compilation, gather all of the <tt>.o</tt> bytecode files and libraries that are
171being linked together (the "<tt><b>llvm-gcc</b> -v</tt>" output should include
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]172the full list of objects linked). Then run:</p>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]173
Misha Brukmanf4e4feb2004-04-15 20:49:32 +0000[diff] [blame^]174<div class="doc_code">
175<p><tt><b>llvm-as</b> &lt; /dev/null &gt; null.bc
176 <b>gccld</b> -debug-pass=Arguments null.bc</tt></p>
177</div>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]178
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]179<p>... which will print a list of arguments, indicating the list of passes that
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]180<tt><b>gccld</b></tt> runs. Once you have the input files and the list of
181passes, go to the section on <a href="#passes">debugging bugs in LLVM
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]182passes</a>.</p>
183
184</div>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]185
186<!-- ======================================================================= -->
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]187<div class="doc_subsection">
188 <a name="passes">Bugs in LLVM passes</a>
189</div>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]190
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]191<div class="doc_text">
192
193<p>At this point, you should have some number of LLVM assembly files or bytecode
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]194files and a list of passes which crash when run on the specified input. In
195order to reduce the list of passes (which is probably large) and the input to
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]196something tractable, use the <tt><b>bugpoint</b></tt> tool as follows:</p>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]197
Misha Brukmanf4e4feb2004-04-15 20:49:32 +0000[diff] [blame^]198<div class="doc_code">
199<p><tt><b>bugpoint</b> &lt;input files&gt; &lt;list of passes&gt;</tt></p>
200</div>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]201
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]202<p><tt><b>bugpoint</b></tt> will print a bunch of output as it reduces the
203test-case, but it should eventually print something like this:</p>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]204
205<pre>
206 ...
207 Emitted bytecode to 'bugpoint-reduced-simplified.bc'
208
209 *** You can reproduce the problem with: opt bugpoint-reduced-simplified.bc -licm
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]210</pre>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]211
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]212<p>Once you complete this, please send the LLVM bytecode file and the command
213line to reproduce the problem to the llvmbugs mailing list.</p>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]214
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]215</div>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]216
217<!-- *********************************************************************** -->
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]218<div class="doc_section">
219 <a name="miscompilations">Miscompilations</a>
220</div>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]221<!-- *********************************************************************** -->
222
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]223<div class="doc_text">
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]224
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]225<p>A miscompilation occurs when a pass does not correctly transform a program,
226thus producing errors that are only noticed during execution. This is different
227from producing invalid LLVM code (i.e., code not in SSA form, using values
228before defining them, etc.) which the verifier will check for after a pass
229finishes its run.</p>
230
231<p>To debug a miscompilation, you should choose which program you wish to run
232the output through, e.g. C backend, the JIT, or LLC, and a selection of passes,
233one of which may be causing the error, and run, for example:</p>
Misha Brukmanf1d01fb2003-09-17 18:51:47 +0000[diff] [blame]234
Misha Brukmanf4e4feb2004-04-15 20:49:32 +0000[diff] [blame^]235<div class="doc_code">
236<p><tt><b>bugpoint</b> -run-cbe [... optimization passes ...] file-to-test.bc
237--args -- [program arguments]</tt></p>
238</div>
Misha Brukmanf1d01fb2003-09-17 18:51:47 +0000[diff] [blame]239
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]240<p><tt>bugpoint</tt> will try to narrow down your list of passes to the one pass
Misha Brukmanf1d01fb2003-09-17 18:51:47 +0000[diff] [blame]241that causes an error, and simplify the bytecode file as much as it can to assist
242you. It will print a message letting you know how to reproduce the resulting
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]243error.</p>
244
245</div>
Misha Brukmanf1d01fb2003-09-17 18:51:47 +0000[diff] [blame]246
247<!-- *********************************************************************** -->
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]248<div class="doc_section">
249 <a name="codegen">Incorrect code generation</a>
250</div>
Misha Brukmanf1d01fb2003-09-17 18:51:47 +0000[diff] [blame]251<!-- *********************************************************************** -->
252
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]253<div class="doc_text">
254
255<p>Similarly to debugging incorrect compilation by mis-behaving passes, you can
Misha Brukmanf1d01fb2003-09-17 18:51:47 +0000[diff] [blame]256debug incorrect code generation by either LLC or the JIT, using
257<tt>bugpoint</tt>. The process <tt>bugpoint</tt> follows in this case is to try
258to narrow the code down to a function that is miscompiled by one or the other
259method, but since for correctness, the entire program must be run,
260<tt>bugpoint</tt> will compile the code it deems to not be affected with the C
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]261Backend, and then link in the shared object it generates.</p>
Misha Brukmanf1d01fb2003-09-17 18:51:47 +0000[diff] [blame]262
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]263<p>To debug the JIT:</p>
264
Misha Brukmanf4e4feb2004-04-15 20:49:32 +0000[diff] [blame^]265<div class="doc_code">
266<p><tt><b>bugpoint</b> -run-jit -output=[correct output file] [bytecode file]
267--args -- [program arguments]</tt></p>
268</div>
Misha Brukmanf1d01fb2003-09-17 18:51:47 +0000[diff] [blame]269
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]270<p>Similarly, to debug the LLC, one would run:</p>
271
Misha Brukmanf4e4feb2004-04-15 20:49:32 +0000[diff] [blame^]272<div class="doc_code">
273<p><tt><b>bugpoint</b> -run-llc -output=[correct output file] [bytecode file]
274--args -- [program arguments]</tt></p>
275</div>
Misha Brukmanf1d01fb2003-09-17 18:51:47 +0000[diff] [blame]276
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]277<p>At the end of a successful <tt>bugpoint</tt> run, you will be presented
Misha Brukmanf1d01fb2003-09-17 18:51:47 +0000[diff] [blame]278with two bytecode files: a <em>safe</em> file which can be compiled with the C
279backend and the <em>test</em> file which either LLC or the JIT
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]280mis-codegenerates, and thus causes the error.</p>
Misha Brukmanf1d01fb2003-09-17 18:51:47 +0000[diff] [blame]281
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]282<p>To reproduce the error that <tt>bugpoint</tt> found, it is sufficient to do
283the following:</p>
Misha Brukmanf1d01fb2003-09-17 18:51:47 +0000[diff] [blame]284
285<ol>
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]286
Misha Brukmanf4e4feb2004-04-15 20:49:32 +0000[diff] [blame^]287 <li><p>Regenerate the shared object from the safe bytecode file:</p>
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]288
Misha Brukmanf4e4feb2004-04-15 20:49:32 +0000[diff] [blame^]289 <div class="doc_code">
290 <p><tt><b>llc</b> -march=c safe.bc -o safe.c<br>
291 <b>gcc</b> -shared safe.c -o safe.so</tt></p>
292 </div></li>
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]293
Misha Brukmanf4e4feb2004-04-15 20:49:32 +0000[diff] [blame^]294 <li><p>If debugging LLC, compile test bytecode native and link with the shared
295 object:</p>
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]296
Misha Brukmanf4e4feb2004-04-15 20:49:32 +0000[diff] [blame^]297 <div class="doc_code">
298 <p><tt><b>llc</b> test.bc -o test.s -f<br>
299 <b>gcc</b> test.s safe.so -o test.llc<br>
300 ./test.llc [program options]</tt></p>
301 </div></li>
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]302
Misha Brukmanf4e4feb2004-04-15 20:49:32 +0000[diff] [blame^]303 <li><p>If debugging the JIT, load the shared object and supply the test
304 bytecode:</p>
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]305
Misha Brukmanf4e4feb2004-04-15 20:49:32 +0000[diff] [blame^]306 <div class="doc_code">
307 <p><tt><b>lli</b> -load=safe.so test.bc [program options]</tt></p>
308 </div></li>
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]309
Misha Brukmanf1d01fb2003-09-17 18:51:47 +0000[diff] [blame]310</ol>
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]311
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]312</div>
313
Chris Lattner8b6be362003-05-21 22:21:07 +0000[diff] [blame]314<!-- *********************************************************************** -->
Misha Brukman94082392003-10-31 18:37:20 +0000[diff] [blame]315<hr>
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