8309550: jdk.jfr.internal.Utils::formatDataAmount method should gracefully handle amounts equal to Long.MIN_VALUE

Reviewed-by: stuefe, mgronlun

Author: fthevenet

src/jdk.jfr/share/classes/jdk/jfr/internal/Utils.java

@@ -121,9 +121,9 @@ private static enum TimespanUnit {
         }
     }
 
-    // Tjis method can't handle Long.MIN_VALUE because absolute value is negative
+    // handle Long.MIN_VALUE as a special case since its absolute value is negative
     private static String formatDataAmount(String formatter, long amount) {
-        int exp = (int) (Math.log(Math.abs(amount)) / Math.log(1024));
+        int exp = (amount == Long.MIN_VALUE) ? 6 : (int) (Math.log(Math.abs(amount)) / Math.log(1024));
         char unitPrefix = "kMGTPE".charAt(exp - 1);
         return String.format(formatter, amount / Math.pow(1024, exp), unitPrefix);
     }

src/jdk.jfr/share/classes/jdk/jfr/internal/util/ValueFormatter.java

@@ -146,9 +146,9 @@ public static String formatClass(RecordedClass clazz) {
         return name;
     }
 
-    // Tjis method can't handle Long.MIN_VALUE because absolute value is negative
+    // handle Long.MIN_VALUE as a special case since its absolute value is negative
     private static String formatDataAmount(String formatter, long amount) {
-        int exp = (int) (Math.log(Math.abs(amount)) / Math.log(1024));
+        int exp = (amount == Long.MIN_VALUE) ? 6 : (int) (Math.log(Math.abs(amount)) / Math.log(1024));
         char unitPrefix = "kMGTPE".charAt(exp - 1);
         return String.format(formatter, amount / Math.pow(1024, exp), unitPrefix);
     }