I want to start with disclaimer that the following code has a bug -
Integer overflow.
public class Main
{
public static void main(String... args )
{
int start = Integer.MIN_VALUE;
int end = Integer.MAX_VALUE;
int i = 0;
System.out.println("Start:");
for( i = start; i <= end; i++ )
{
if ( ( i % 1000000 ) == 0 )
System.out.println(i);
}
System.out.println("End: " + String.valueOf(i) );
}
}
The loop termination condition is wrong. It should have been 'i <
end'. The above loop should not terminate - "i" will be just
overflow.
One interesting behavior is that if I use '-client' option, the
program never terminates. However, when I use '-server' option, the
program terminates in the middle. The result of "i" is different each
time. I am guessing that this is caused by HotSpot optimization.
First, is this correct behavior? Having '-client' and '-server'
acting differently?
Second, how can I find more information about it? I tried '-XX:
+PrintOptoAssembly' using debug JDK but no clue how to interpret it.
Any help will be greatly appreciated.
Thanks.
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