1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   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
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test IsMethodCompilableTest
  26  * @bug 8007270 8006683 8007288 8022832
  27  * @library /testlibrary /testlibrary/whitebox /testlibrary/com/oracle/java/testlibrary
  28  * @build IsMethodCompilableTest
  29  * @run main ClassFileInstaller sun.hotspot.WhiteBox
  30  * @run main ClassFileInstaller com.oracle.java.testlibrary.Platform
  31  * @run main/othervm/timeout=2400 -Xbootclasspath/a:. -Xmixed -XX:-TieredCompilation -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:PerMethodRecompilationCutoff=3 -XX:CompileCommand=compileonly,SimpleTestCase$Helper::* IsMethodCompilableTest
  32  * @summary testing of WB::isMethodCompilable()
  33  * @author igor.ignatyev@oracle.com
  34  */
  35 
  36 import com.oracle.java.testlibrary.Platform;
  37 
  38 public class IsMethodCompilableTest extends CompilerWhiteBoxTest {
  39     /**
  40      * Value of {@code -XX:PerMethodRecompilationCutoff}
  41      */
  42     protected static final long PER_METHOD_RECOMPILATION_CUTOFF;
  43 
  44     static {
  45         long tmp = Long.parseLong(
  46                 getVMOption("PerMethodRecompilationCutoff", "400"));
  47         if (tmp == -1) {
  48             PER_METHOD_RECOMPILATION_CUTOFF = -1 /* Inf */;
  49         } else {
  50             PER_METHOD_RECOMPILATION_CUTOFF = (0xFFFFFFFFL & tmp);
  51         }
  52     }
  53 
  54     public static void main(String[] args) throws Exception {
  55         CompilerWhiteBoxTest.main(IsMethodCompilableTest::new, args);
  56     }
  57 
  58     private IsMethodCompilableTest(TestCase testCase) {
  59         super(testCase);
  60         // to prevent inlining of #method
  61         WHITE_BOX.testSetDontInlineMethod(method, true);
  62     }
  63 
  64     /**
  65      * Tests {@code WB::isMethodCompilable()} by recompilation of tested method
  66      * 'PerMethodRecompilationCutoff' times and checks compilation status. Also
  67      * checks that WB::clearMethodState() clears no-compilable flags. Only
  68      * applicable to c2 compiled methods.
  69      *
  70      * @throws Exception if one of the checks fails.
  71      */
  72     @Override
  73     protected void test() throws Exception {
  74         // Only c2 compilations can be disabled through PerMethodRecompilationCutoff
  75         if (!Platform.isServer()) {
  76             return;
  77         }
  78 
  79         if (skipXcompOSR()) {
  80           return;
  81         }
  82         if (!isCompilable(COMP_LEVEL_FULL_OPTIMIZATION)) {
  83             throw new RuntimeException(method + " must be compilable");
  84         }
  85         System.out.println("PerMethodRecompilationCutoff = "
  86                 + PER_METHOD_RECOMPILATION_CUTOFF);
  87         if (PER_METHOD_RECOMPILATION_CUTOFF == -1) {
  88             System.err.println(
  89                     "Warning: test is not applicable if PerMethodRecompilationCutoff == Inf");
  90             return;
  91         }
  92 
  93         // deoptimize 'PerMethodRecompilationCutoff' times
  94         for (long attempts = 0, successes = 0;
  95                (successes < PER_METHOD_RECOMPILATION_CUTOFF)  &&
  96                (attempts < PER_METHOD_RECOMPILATION_CUTOFF*2) &&
  97                isCompilable(COMP_LEVEL_FULL_OPTIMIZATION); attempts++) {
  98             if (compileAndDeoptimize() == COMP_LEVEL_FULL_OPTIMIZATION) {
  99                 successes++;
 100             }
 101         }
 102 
 103         if (!testCase.isOsr() && !isCompilable(COMP_LEVEL_FULL_OPTIMIZATION)) {
 104             // in osr test case count of deopt maybe more than iterations
 105             throw new RuntimeException(method + " is not compilable after "
 106                     + PER_METHOD_RECOMPILATION_CUTOFF + " iterations");
 107         }
 108 
 109         // Now compile once more
 110         compileAndDeoptimize();
 111 
 112         if (isCompilable(COMP_LEVEL_FULL_OPTIMIZATION)) {
 113             throw new RuntimeException(method + " is still compilable after "
 114                     + PER_METHOD_RECOMPILATION_CUTOFF + " iterations");
 115         }
 116         checkNotCompiled();
 117         compile();
 118         waitBackgroundCompilation();
 119         checkNotCompiled(COMP_LEVEL_FULL_OPTIMIZATION);
 120 
 121         // WB.clearMethodState() must reset no-compilable flags
 122         WHITE_BOX.clearMethodState(method);
 123         if (!isCompilable(COMP_LEVEL_FULL_OPTIMIZATION)) {
 124             throw new RuntimeException(method
 125                     + " is not compilable after clearMethodState()");
 126         }
 127         compile();
 128         checkCompiled();
 129     }
 130 
 131     private int compileAndDeoptimize() throws Exception {
 132         compile();
 133         waitBackgroundCompilation();
 134         int compLevel = getCompLevel();
 135         deoptimize();
 136         return compLevel;
 137     }
 138 }