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test/runtime/whitebox/WBStackSize.java

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rev 7563 : 8067941: [TESTBUG] Fix tests for OS with 64K page size.


  30  *                              sun.hotspot.WhiteBox$WhiteBoxPermission
  31  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xss512k WBStackSize
  32  */
  33 
  34 /*
  35  * The test may product a false failure if too big StackYellowPages/StackRedPages/ShackShadowPages
  36  * VM options are specified. The proper test would retrieve the page size from VM and account for these options
  37  * instead of check below:
  38  *     Math.abs(actualStackSize - configStackSize) > configStackSize * 0.1
  39  *
  40  * Please file a test bug, if this is a problem.
  41  */
  42 
  43 import sun.hotspot.WhiteBox;
  44 
  45 public class WBStackSize {
  46 
  47     static final long K = 1024;
  48 
  49     static final long MIN_STACK_SIZE = 8 * K;
  50     static final long MAX_STACK_SIZE_ALLOCATED_IN_MAIN = 200 * K; // current value is about 130k on 64-bit platforms
  51 
  52     static final WhiteBox wb = WhiteBox.getWhiteBox();
  53 
  54     static long stackSizeOnOverflow = -1;
  55 
  56     static int eatAllStack() {
  57         return eatAllStack() * 2;
  58     }
  59 
  60     static void testStackOverflow() {
  61 
  62         stackSizeOnOverflow = wb.getThreadRemainingStackSize();
  63 
  64         if (stackSizeOnOverflow > MIN_STACK_SIZE) {
  65 
  66             try {
  67                 testStackOverflow();
  68             } catch (StackOverflowError e) {
  69                 // We caught SOE too early. The error will be reported in main()
  70             }
  71 
  72         } else {
  73 
  74             try {
  75                 eatAllStack();
  76                 throw new RuntimeException("Haven't caught StackOverflowError at all");
  77             } catch (StackOverflowError e) {
  78                 // OK: we caught the anticipated error
  79             }
  80         }
  81     }
  82 
  83     public static void main(String[] args) {
  84         long configStackSize = wb.getIntxVMFlag("ThreadStackSize") * K;
  85 
  86         System.out.println("ThreadStackSize VM option: " + configStackSize);
  87 



  88         long actualStackSize = wb.getThreadStackSize();
  89         System.out.println("Full stack size: " + actualStackSize);
  90 
  91         if (Math.abs(actualStackSize - configStackSize) > configStackSize * 0.1) {
  92             throw new RuntimeException("getThreadFullStackSize value [" + actualStackSize
  93                                      + "] should be within 90%..110% of the value returned by HotSpotDiagnosticMXBean");
  94         }
  95 
  96         long remainingStackSize = wb.getThreadRemainingStackSize();
  97         System.out.println("Remaining stack size in main(): " + remainingStackSize);
  98 
  99         // Up to 200k can be already allocated by VM


 100         if (remainingStackSize > configStackSize
 101                 || (configStackSize > MAX_STACK_SIZE_ALLOCATED_IN_MAIN
 102                 && remainingStackSize < configStackSize - MAX_STACK_SIZE_ALLOCATED_IN_MAIN)) {
 103 
 104             throw new RuntimeException("getThreadRemainingStackSize value [" + remainingStackSize
 105                                      + "] should be at least ThreadStackSize value [" + configStackSize + "] minus ["
 106                                      + MAX_STACK_SIZE_ALLOCATED_IN_MAIN + "]");
 107         }
 108 
 109         testStackOverflow();
 110 
 111         if (stackSizeOnOverflow > MIN_STACK_SIZE) {
 112             throw new RuntimeException("Caught StackOverflowError too early: when there were "
 113                                      + stackSizeOnOverflow + " bytes in stack");
 114         } else if (stackSizeOnOverflow < 0) {
 115             throw new RuntimeException("Internal test error: stackRemainingSize < 0");
 116         } else {
 117             System.out.println("Caught StackOverflowError as expected");
 118         }
 119     }
 120 }


  30  *                              sun.hotspot.WhiteBox$WhiteBoxPermission
  31  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xss512k WBStackSize
  32  */
  33 
  34 /*
  35  * The test may product a false failure if too big StackYellowPages/StackRedPages/ShackShadowPages
  36  * VM options are specified. The proper test would retrieve the page size from VM and account for these options
  37  * instead of check below:
  38  *     Math.abs(actualStackSize - configStackSize) > configStackSize * 0.1
  39  *
  40  * Please file a test bug, if this is a problem.
  41  */
  42 
  43 import sun.hotspot.WhiteBox;
  44 
  45 public class WBStackSize {
  46 
  47     static final long K = 1024;
  48 
  49     static final long MIN_STACK_SIZE = 8 * K;
  50     static final long MAX_STACK_SIZE_ALLOCATED_IN_MAIN = 150 * K; // current value is about 130k on 64-bit platforms
  51 
  52     static final WhiteBox wb = WhiteBox.getWhiteBox();
  53 
  54     static long stackSizeOnOverflow = -1;
  55 
  56     static int eatAllStack() {
  57         return eatAllStack() * 2;
  58     }
  59 
  60     static void testStackOverflow() {
  61 
  62         stackSizeOnOverflow = wb.getThreadRemainingStackSize();
  63 
  64         if (stackSizeOnOverflow > MIN_STACK_SIZE) {
  65 
  66             try {
  67                 testStackOverflow();
  68             } catch (StackOverflowError e) {
  69                 // We caught SOE too early. The error will be reported in main()
  70             }
  71 
  72         } else {
  73 
  74             try {
  75                 eatAllStack();
  76                 throw new RuntimeException("Haven't caught StackOverflowError at all");
  77             } catch (StackOverflowError e) {
  78                 // OK: we caught the anticipated error
  79             }
  80         }
  81     }
  82 
  83     public static void main(String[] args) {
  84         long configStackSize = wb.getIntxVMFlag("ThreadStackSize") * K;

  85         System.out.println("ThreadStackSize VM option: " + configStackSize);
  86 
  87         long stackProtectionSize = wb.getIntxVMFlag("StackShadowPages") * wb.getVMPageSize();
  88         System.out.println("Size of protected shadow pages: " + stackProtectionSize);
  89 
  90         long actualStackSize = wb.getThreadStackSize();
  91         System.out.println("Full stack size: " + actualStackSize);
  92 
  93         if (Math.abs(actualStackSize - configStackSize) > configStackSize * 0.1) {
  94             throw new RuntimeException("getThreadFullStackSize value [" + actualStackSize
  95                                      + "] should be within 90%..110% of the value returned by HotSpotDiagnosticMXBean");
  96         }
  97 
  98         long remainingStackSize = wb.getThreadRemainingStackSize();
  99         System.out.println("Remaining stack size in main(): " + remainingStackSize);
 100 
 101         // Up to 150k can be already allocated by VM and some space is used for stack protection.
 102         long spaceAlreadyOccupied = MAX_STACK_SIZE_ALLOCATED_IN_MAIN + stackProtectionSize;
 103 
 104         if (remainingStackSize > configStackSize
 105             || (configStackSize > spaceAlreadyOccupied
 106                 && remainingStackSize < configStackSize - spaceAlreadyOccupied)) {
 107 
 108             throw new RuntimeException("getThreadRemainingStackSize value [" + remainingStackSize
 109                                      + "] should be at least ThreadStackSize value [" + configStackSize + "] minus ["
 110                                      + spaceAlreadyOccupied + "]");
 111         }
 112 
 113         testStackOverflow();
 114 
 115         if (stackSizeOnOverflow > MIN_STACK_SIZE) {
 116             throw new RuntimeException("Caught StackOverflowError too early: when there were "
 117                                      + stackSizeOnOverflow + " bytes in stack");
 118         } else if (stackSizeOnOverflow < 0) {
 119             throw new RuntimeException("Internal test error: stackRemainingSize < 0");
 120         } else {
 121             System.out.println("Caught StackOverflowError as expected");
 122         }
 123     }
 124 }
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