[8u] RFR (XS) 8166046: [TESTBUG] compiler/stringopts/TestStringObjectInitialization.java fails with OOME

[Aleksey Shipilev]

Original test bug:
   https://bugs.openjdk.java.net/browse/JDK-8166046
   https://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/d288db38d1aa

This is a part of larger effort to improve JDK 8 testing. This patch is very simple, yet it does not 
apply cleanly, because "8132919: Put compiler tests in packages" is missing. 8u patch is otherwise 
the same:

diff -r b4de82aff831 test/compiler/stringopts/TestStringObjectInitialization.java
--- a/test/compiler/stringopts/TestStringObjectInitialization.java      Wed Dec 10 13:58:30 2014 +0000
+++ b/test/compiler/stringopts/TestStringObjectInitialization.java      Tue Apr 20 10:59:56 2021 +0200
@@ -57,10 +57,15 @@

      public void run(String s, String[] sArray) {
          // Trigger C2's string concatenation optimization
          add(s + Arrays.toString(sArray) + " const ");
      }
+
+    public void reset() {
+        // Reset string to avoid OOMEs
+        myString = "";
+    }
  }

  class Runner implements Runnable {
      private TestStringObjectInitialization test;

@@ -68,11 +73,12 @@
          test = t;
      }

      public void run(){
          String[] array = {"a", "b", "c"};
-        for (int i = 0; i < 10000; ++i) {
+        for (int i = 0; i < 100_000; ++i) {
              test.run("a", array);
+            test.reset();
          }
      }
  }

Testing: tier1

-- 
Thanks,
-Aleksey