The changes reflect the feature request eclipse-openj9#16416 - part 2…

… of eclipse-openj9#20641

Adding cmdline option to specify string length to be printed.
-Xtrace:methodstrarglen=[1-128]
methodStrArgLen takes an unsigned integer value from 1 to 128
If no methodStrArgLen is specified, or is set to 0, the printed length is the default value of 32.
Other invalid inputs result in the following:
"Error processing trace option, detail: methodstrarglen takes an unsigned integer value from 0 to 128
 Trace option unrecognized: -Xtrace:methodStrArgLen
 Error processing trace option: -Xtrace:methodStrArgLen=<invalid input>
"

There will be subsequent PRs for tests (part 3).

Signed-off-by: Nick Kamal <[email protected]>

runtime/rastrace/method_trigger.c

@@ -567,7 +567,7 @@ setMethodStrArgLength(J9JavaVM *vm, const char *str, BOOLEAN atRuntime)
 
     p = getPositionalParm(1, str, &length);
 
-    if (length > 3) {
+    if (length > 1) {
         goto err;
     }
 
@@ -585,7 +585,7 @@ setMethodStrArgLength(J9JavaVM *vm, const char *str, BOOLEAN atRuntime)
     return OMR_ERROR_NONE;
 
 err:
-    vaReportJ9VMCommandLineError(PORTLIB, "methodstrarglen takes an unsigned integer value from 0 to %d", MAX_STRING_LENGTH);
+    vaReportJ9VMCommandLineError(PORTLIB, "methodstrarglen takes an unsigned integer value from 1 to %d", MAX_STRING_LENGTH);
     return OMR_ERROR_INTERNAL;
 }