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23 
24 package gc.arguments;
25 
26 import com.sun.management.HotSpotDiagnosticMXBean;
27 import com.sun.management.VMOption;
28 
29 import java.util.regex.Matcher;
30 import java.util.regex.Pattern;
31 import java.util.ArrayList;
32 import java.util.Arrays;
33 
34 import jdk.test.lib.Asserts;
35 import jdk.test.lib.process.ProcessTools;
36 import jdk.test.lib.process.OutputAnalyzer;
37 import java.lang.management.ManagementFactory;
38 import sun.hotspot.WhiteBox;
39 
40 class DetermineMaxHeapForCompressedOops {
main(String[] args)41   public static void main(String[] args) throws Exception {
42     WhiteBox wb = WhiteBox.getWhiteBox();
43     System.out.print(wb.getCompressedOopsMaxHeapSize());
44   }
45 }
46 
47 class TestUseCompressedOopsErgoTools {
48 
getCompressedClassSpaceSize()49   private static long getCompressedClassSpaceSize() {
50     HotSpotDiagnosticMXBean diagnostic =
51         ManagementFactory.getPlatformMXBean(HotSpotDiagnosticMXBean.class);
52 
53     VMOption option = diagnostic.getVMOption("CompressedClassSpaceSize");
54     return Long.parseLong(option.getValue());
55   }
56 
57 
getMaxHeapForCompressedOops(String[] vmargs)58   public static long getMaxHeapForCompressedOops(String[] vmargs) throws Exception {
59     OutputAnalyzer output = runWhiteBoxTest(vmargs, DetermineMaxHeapForCompressedOops.class.getName(), new String[] {});
60     return Long.parseLong(output.getStdout());
61   }
62 
is64bitVM()63   public static boolean is64bitVM() {
64     String val = System.getProperty("sun.arch.data.model");
65     if (val == null) {
66       throw new RuntimeException("Could not read sun.arch.data.model");
67     }
68     if (val.equals("64")) {
69       return true;
70     } else if (val.equals("32")) {
71       return false;
72     }
73     throw new RuntimeException("Unexpected value " + val + " of sun.arch.data.model");
74   }
75 
76   /**
77    * Executes a new VM process with the given class and parameters.
78    * @param vmargs Arguments to the VM to run
79    * @param classname Name of the class to run
80    * @param arguments Arguments to the class
81    * @return The OutputAnalyzer with the results for the invocation.
82    */
runWhiteBoxTest(String[] vmargs, String classname, String[] arguments)83   public static OutputAnalyzer runWhiteBoxTest(String[] vmargs, String classname, String[] arguments) throws Exception {
84     ArrayList<String> finalargs = new ArrayList<String>();
85 
86     String[] whiteboxOpts = new String[] {
87       "-Xbootclasspath/a:.",
88       "-XX:+UnlockDiagnosticVMOptions", "-XX:+WhiteBoxAPI",
89       "-cp", System.getProperty("java.class.path"),
90     };
91 
92     finalargs.addAll(Arrays.asList(vmargs));
93     finalargs.addAll(Arrays.asList(whiteboxOpts));
94     finalargs.add(classname);
95     finalargs.addAll(Arrays.asList(arguments));
96 
97     ProcessBuilder pb = GCArguments.createJavaProcessBuilder(finalargs);
98     OutputAnalyzer output = new OutputAnalyzer(pb.start());
99     output.shouldHaveExitValue(0);
100     return output;
101   }
102 
join(String[] part1, String part2)103   private static String[] join(String[] part1, String part2) {
104     ArrayList<String> result = new ArrayList<String>();
105     result.addAll(Arrays.asList(part1));
106     result.add(part2);
107     return result.toArray(String[]::new);
108   }
109 
checkCompressedOopsErgo(String[] gcflags)110   public static void checkCompressedOopsErgo(String[] gcflags) throws Exception {
111     long maxHeapForCompressedOops = getMaxHeapForCompressedOops(gcflags);
112 
113     checkUseCompressedOops(gcflags, maxHeapForCompressedOops, true);
114     checkUseCompressedOops(gcflags, maxHeapForCompressedOops - 1, true);
115     checkUseCompressedOops(gcflags, maxHeapForCompressedOops + 1, false);
116 
117     // the use of HeapBaseMinAddress should not change the outcome
118     checkUseCompressedOops(join(gcflags, "-XX:HeapBaseMinAddress=32G"), maxHeapForCompressedOops, true);
119     checkUseCompressedOops(join(gcflags, "-XX:HeapBaseMinAddress=32G"), maxHeapForCompressedOops - 1, true);
120     checkUseCompressedOops(join(gcflags, "-XX:HeapBaseMinAddress=32G"), maxHeapForCompressedOops + 1, false);
121 
122     // use a different object alignment
123     maxHeapForCompressedOops = getMaxHeapForCompressedOops(join(gcflags, "-XX:ObjectAlignmentInBytes=16"));
124 
125     checkUseCompressedOops(join(gcflags, "-XX:ObjectAlignmentInBytes=16"), maxHeapForCompressedOops, true);
126     checkUseCompressedOops(join(gcflags, "-XX:ObjectAlignmentInBytes=16"), maxHeapForCompressedOops - 1, true);
127     checkUseCompressedOops(join(gcflags, "-XX:ObjectAlignmentInBytes=16"), maxHeapForCompressedOops + 1, false);
128 
129     // use a different CompressedClassSpaceSize
130     String compressedClassSpaceSizeArg = "-XX:CompressedClassSpaceSize=" + 2 * getCompressedClassSpaceSize();
131     maxHeapForCompressedOops = getMaxHeapForCompressedOops(join(gcflags, compressedClassSpaceSizeArg));
132 
133     checkUseCompressedOops(join(gcflags, compressedClassSpaceSizeArg), maxHeapForCompressedOops, true);
134     checkUseCompressedOops(join(gcflags, compressedClassSpaceSizeArg), maxHeapForCompressedOops - 1, true);
135     checkUseCompressedOops(join(gcflags, compressedClassSpaceSizeArg), maxHeapForCompressedOops + 1, false);
136   }
137 
checkUseCompressedOops(String[] args, long heapsize, boolean expectUseCompressedOops)138   private static void checkUseCompressedOops(String[] args, long heapsize, boolean expectUseCompressedOops) throws Exception {
139      ArrayList<String> finalargs = new ArrayList<String>();
140      finalargs.addAll(Arrays.asList(args));
141      finalargs.add("-Xmx" + heapsize);
142      finalargs.add("-XX:+PrintFlagsFinal");
143      finalargs.add("-version");
144 
145      String output = expectValid(finalargs.toArray(new String[0]));
146 
147      boolean actualUseCompressedOops = getFlagBoolValue(" UseCompressedOops", output);
148 
149      Asserts.assertEQ(expectUseCompressedOops, actualUseCompressedOops);
150   }
151 
getFlagBoolValue(String flag, String where)152   private static boolean getFlagBoolValue(String flag, String where) {
153     Matcher m = Pattern.compile(flag + "\\s+:?= (true|false)").matcher(where);
154     if (!m.find()) {
155       throw new RuntimeException("Could not find value for flag " + flag + " in output string");
156     }
157     return m.group(1).equals("true");
158   }
159 
expect(String[] flags, boolean hasWarning, boolean hasError, int errorcode)160   private static String expect(String[] flags, boolean hasWarning, boolean hasError, int errorcode) throws Exception {
161     ProcessBuilder pb = GCArguments.createJavaProcessBuilder(flags);
162     OutputAnalyzer output = new OutputAnalyzer(pb.start());
163     output.shouldHaveExitValue(errorcode);
164     return output.getStdout();
165   }
166 
expectValid(String[] flags)167   private static String expectValid(String[] flags) throws Exception {
168     return expect(flags, false, false, 0);
169   }
170 }
171