1 /*
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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5  * This code is free software; you can redistribute it and/or modify it
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9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
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17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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23 
24 
25 package org.graalvm.compiler.hotspot;
26 
27 import static org.graalvm.compiler.hotspot.HotSpotGraalCompiler.fmt;
28 import static org.graalvm.compiler.hotspot.HotSpotGraalCompiler.str;
29 import java.util.Comparator;
30 import java.util.HashMap;
31 import java.util.Map;
32 import java.util.Map.Entry;
33 import java.util.SortedSet;
34 import java.util.TreeSet;
35 
36 import org.graalvm.compiler.debug.TTY;
37 import org.graalvm.compiler.options.Option;
38 import org.graalvm.compiler.options.OptionType;
39 import org.graalvm.compiler.options.OptionValues;
40 import org.graalvm.compiler.options.OptionKey;
41 import jdk.vm.ci.code.CompilationRequest;
42 import jdk.vm.ci.meta.ResolvedJavaMethod;
43 
44 class CompilationCounters {
45 
46     public static class Options {
47         // @formatter:off
48         @Option(help = "The number of compilations allowed for any method before " +
49                        "the VM exits (a value of 0 means there is no limit).", type = OptionType.Debug)
50         public static final OptionKey<Integer> CompilationCountLimit = new OptionKey<>(0);
51         // @formatter:on
52     }
53 
54     private final OptionValues options;
55 
CompilationCounters(OptionValues options)56     CompilationCounters(OptionValues options) {
57         TTY.println("Warning: Compilation counters enabled, excessive recompilation of a method will cause a failure!");
58         this.options = options;
59     }
60 
61     private final Map<ResolvedJavaMethod, Integer> counters = new HashMap<>();
62 
63     /**
64      * Counts the number of compilations for the {@link ResolvedJavaMethod} of the
65      * {@link CompilationRequest}. If the number of compilations exceeds
66      * {@link Options#CompilationCountLimit} this method prints an error message and exits the VM.
67      *
68      * @param method the method about to be compiled
69      */
countCompilation(ResolvedJavaMethod method)70     synchronized void countCompilation(ResolvedJavaMethod method) {
71         Integer val = counters.get(method);
72         val = val != null ? val + 1 : 1;
73         counters.put(method, val);
74         if (val > Options.CompilationCountLimit.getValue(options)) {
75             TTY.printf("Error. Method %s was compiled too many times. Number of compilations: %d\n", fmt(method),
76                             CompilationCounters.Options.CompilationCountLimit.getValue(options));
77             TTY.println("==================================== High compilation counters ====================================");
78             SortedSet<Map.Entry<ResolvedJavaMethod, Integer>> sortedCounters = new TreeSet<>(new CounterComparator());
79             for (Map.Entry<ResolvedJavaMethod, Integer> e : counters.entrySet()) {
80                 sortedCounters.add(e);
81             }
82             for (Map.Entry<ResolvedJavaMethod, Integer> entry : sortedCounters) {
83                 if (entry.getValue() >= Options.CompilationCountLimit.getValue(options) / 2) {
84                     TTY.out.printf("%d\t%s%n", entry.getValue(), str(entry.getKey()));
85                 }
86             }
87             TTY.flush();
88             System.exit(-1);
89         }
90     }
91 
92     static final class CounterComparator implements Comparator<Map.Entry<ResolvedJavaMethod, Integer>> {
93         @Override
compare(Entry<ResolvedJavaMethod, Integer> o1, Entry<ResolvedJavaMethod, Integer> o2)94         public int compare(Entry<ResolvedJavaMethod, Integer> o1, Entry<ResolvedJavaMethod, Integer> o2) {
95             if (o1.getValue() < o2.getValue()) {
96                 return -1;
97             }
98             if (o1.getValue() > o2.getValue()) {
99                 return 1;
100             }
101             return str(o1.getKey()).compareTo(str(o2.getKey()));
102         }
103     }
104 }
105