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comparison utils/findmisopt @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
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children 60c9769439b8
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-1:000000000000 0:95c75e76d11b
1 #!/bin/bash
2 #
3 # findmisopt
4 #
5 # This is a quick and dirty hack to potentially find a misoptimization
6 # problem. Mostly its to work around problems in bugpoint that prevent
7 # it from finding a problem unless the set of failing optimizations are
8 # known and given to it on the command line.
9 #
10 # Given a bitcode file that produces correct output (or return code),
11 # this script will run through all the optimizations passes that gccas
12 # uses (in the same order) and will narrow down which optimizations
13 # cause the program either generate different output or return a
14 # different result code. When the passes have been narrowed down,
15 # bugpoint is invoked to further refine the problem to its origin. If a
16 # release version of bugpoint is available it will be used, otherwise
17 # debug.
18 #
19 # Usage:
20 # findmisopt bcfile outdir progargs [match]
21 #
22 # Where:
23 # bcfile
24 # is the bitcode file input (the unoptimized working case)
25 # outdir
26 # is a directory into which intermediate results are placed
27 # progargs
28 # is a single argument containing all the arguments the program needs
29 # proginput
30 # is a file name from which stdin should be directed
31 # match
32 # if specified to any value causes the result code of the program to
33 # be used to determine success/fail. If not specified success/fail is
34 # determined by diffing the program's output with the non-optimized
35 # output.
36 #
37 if [ "$#" -lt 3 ] ; then
38 echo "usage: findmisopt bcfile outdir progargs [match]"
39 exit 1
40 fi
41
42 dir="${0%%/utils/findmisopt}"
43 if [ -x "$dir/Release/bin/bugpoint" ] ; then
44 bugpoint="$dir/Release/bin/bugpoint"
45 elif [ -x "$dir/Debug/bin/bugpoint" ] ; then
46 bugpoint="$dir/Debug/bin/bugpoint"
47 else
48 echo "findmisopt: bugpoint not found"
49 exit 1
50 fi
51
52 bcfile="$1"
53 outdir="$2"
54 args="$3"
55 input="$4"
56 if [ ! -f "$input" ] ; then
57 input="/dev/null"
58 fi
59 match="$5"
60 name=`basename $bcfile .bc`
61 ll="$outdir/${name}.ll"
62 s="$outdir/${name}.s"
63 prog="$outdir/${name}"
64 out="$outdir/${name}.out"
65 optbc="$outdir/${name}.opt.bc"
66 optll="$outdir/${name}.opt.ll"
67 opts="$outdir/${name}.opt.s"
68 optprog="$outdir/${name}.opt"
69 optout="$outdir/${name}.opt.out"
70 ldflags="-lstdc++ -lm -ldl -lc"
71
72 echo "Test Name: $name"
73 echo "Unoptimized program: $prog"
74 echo " Optimized program: $optprog"
75
76 # Define the list of optimizations to run. This comprises the same set of
77 # optimizations that opt -std-compile-opts and gccld run, in the same order.
78 opt_switches=`llvm-as < /dev/null -o - | opt -std-compile-opts -disable-output -debug-pass=Arguments 2>&1 | sed 's/Pass Arguments: //'`
79 all_switches="$opt_switches"
80 echo "Passes : $all_switches"
81
82 # Create output directory if it doesn't exist
83 if [ -f "$outdir" ] ; then
84 echo "$outdir is not a directory"
85 exit 1
86 fi
87
88 if [ ! -d "$outdir" ] ; then
89 mkdir "$outdir" || exit 1
90 fi
91
92 # Generate the disassembly
93 llvm-dis "$bcfile" -o "$ll" -f || exit 1
94
95 # Generate the non-optimized program and its output
96 llc "$bcfile" -o "$s" -f || exit 1
97 gcc "$s" -o "$prog" $ldflags || exit 1
98 "$prog" $args > "$out" 2>&1 <$input
99 ex1=$?
100
101 # Current set of switches is empty
102 function tryit {
103 switches_to_use="$1"
104 opt $switches_to_use "$bcfile" -o "$optbc" -f || exit
105 llvm-dis "$optbc" -o "$optll" -f || exit
106 llc "$optbc" -o "$opts" -f || exit
107 gcc "$opts" -o "$optprog" $ldflags || exit
108 "$optprog" $args > "$optout" 2>&1 <"$input"
109 ex2=$?
110
111 if [ -n "$match" ] ; then
112 if [ "$ex1" -ne "$ex2" ] ; then
113 echo "Return code not the same with these switches:"
114 echo $switches
115 echo "Unoptimized returned: $ex1"
116 echo "Optimized returned: $ex2"
117 return 0
118 fi
119 else
120 diff "$out" "$optout" > /dev/null
121 if [ $? -ne 0 ] ; then
122 echo "Diff fails with these switches:"
123 echo $switches
124 echo "Differences:"
125 diff "$out" "$optout" | head
126 return 0;
127 fi
128 fi
129 return 1
130 }
131
132 echo "Trying to find optimization that breaks program:"
133 for sw in $all_switches ; do
134 echo -n " $sw"
135 switches="$switches $sw"
136 if tryit "$switches" ; then
137 break;
138 fi
139 done
140
141 # Terminate the previous output with a newline
142 echo ""
143
144 # Determine if we're done because none of the optimizations broke the program
145 if [ "$switches" == " $all_switches" ] ; then
146 echo "The program did not miscompile"
147 exit 0
148 fi
149
150 final=""
151 while [ ! -z "$switches" ] ; do
152 trimmed=`echo "$switches" | sed -e 's/^ *\(-[^ ]*\).*/\1/'`
153 switches=`echo "$switches" | sed -e 's/^ *-[^ ]* *//'`
154 echo "Trimmed $trimmed from left"
155 tryit "$final $switches"
156 if [ "$?" -eq "0" ] ; then
157 echo "Still Failing .. continuing ..."
158 continue
159 else
160 echo "Found required early pass: $trimmed"
161 final="$final $trimmed"
162 continue
163 fi
164 echo "Next Loop"
165 done
166
167 if [ "$final" == " $all_switches" ] ; then
168 echo "findmisopt: All optimizations pass. Perhaps this isn't a misopt?"
169 exit 0
170 fi
171 echo "Smallest Optimization list=$final"
172
173 bpcmd="$bugpoint -run-llc -disable-loop-extraction --output "$out" --input /dev/null $bcfile $final --args $args"
174
175 echo "Running: $bpcmd"
176 $bpcmd
177 echo "findmisopt finished."